worker: use openapi spec and generated code

Write an openapi spec for the worker API and use `deepmap/oapi-codegen`
to generate scaffolding for the server-side using the `labstack/echo`
server.

Incidentally, echo by default returns the errors in the same format that
worker API always has:

    { "message": "..." }

The API itself is unchanged to make this change easier to understand. It
will be changed to better suit our needs in future commits.

vendor/github.com/labstack/echo/v4/.editorconfig

@@ -0,0 +1,25 @@
+# EditorConfig coding styles definitions. For more information about the
+# properties used in this file, please see the EditorConfig documentation:
+# http://editorconfig.org/
+
+# indicate this is the root of the project
+root = true
+
+[*]
+charset = utf-8
+
+end_of_line = LF
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+indent_style = space
+indent_size = 2
+
+[Makefile]
+indent_style = tab
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.go]
+indent_style = tab

vendor/github.com/labstack/echo/v4/.gitattributes

@@ -0,0 +1,20 @@
+# Automatically normalize line endings for all text-based files
+# http://git-scm.com/docs/gitattributes#_end_of_line_conversion
+* text=auto
+
+# For the following file types, normalize line endings to LF on checking and
+# prevent conversion to CRLF when they are checked out (this is required in
+# order to prevent newline related issues)
+.*      text eol=lf
+*.go    text eol=lf
+*.yml   text eol=lf
+*.html  text eol=lf
+*.css   text eol=lf
+*.js    text eol=lf
+*.json  text eol=lf
+LICENSE text eol=lf
+
+# Exclude `website` and `cookbook` from GitHub's language statistics
+# https://github.com/github/linguist#using-gitattributes
+cookbook/* linguist-documentation
+website/* linguist-documentation

vendor/github.com/labstack/echo/v4/.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+coverage.txt
+_test
+vendor
+.idea
+*.iml
+*.out

vendor/github.com/labstack/echo/v4/.travis.yml

@@ -0,0 +1,17 @@
+language: go
+go:
+  - 1.11.x
+  - 1.12.x
+  - tip
+env:
+  - GO111MODULE=on
+install:
+  - go get -v golang.org/x/lint/golint
+script:
+  - golint -set_exit_status ./...
+  - go test -race -coverprofile=coverage.txt -covermode=atomic ./...
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
+matrix:
+  allow_failures:
+    - go: tip

vendor/github.com/labstack/echo/v4/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 LabStack
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/labstack/echo/v4/Makefile

@@ -0,0 +1,3 @@
+tag:
+	@git tag `grep -P '^\tversion = ' echo.go|cut -f2 -d'"'`
+	@git tag|grep -v ^v

vendor/github.com/labstack/echo/v4/README.md

@@ -0,0 +1,113 @@
+<a href="https://echo.labstack.com"><img height="80" src="https://cdn.labstack.com/images/echo-logo.svg"></a>
+
+[![Sourcegraph](https://sourcegraph.com/github.com/labstack/echo/-/badge.svg?style=flat-square)](https://sourcegraph.com/github.com/labstack/echo?badge)
+[![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/labstack/echo)
+[![Go Report Card](https://goreportcard.com/badge/github.com/labstack/echo?style=flat-square)](https://goreportcard.com/report/github.com/labstack/echo)
+[![Build Status](http://img.shields.io/travis/labstack/echo.svg?style=flat-square)](https://travis-ci.org/labstack/echo)
+[![Codecov](https://img.shields.io/codecov/c/github/labstack/echo.svg?style=flat-square)](https://codecov.io/gh/labstack/echo)
+[![Join the chat at https://gitter.im/labstack/echo](https://img.shields.io/badge/gitter-join%20chat-brightgreen.svg?style=flat-square)](https://gitter.im/labstack/echo)
+[![Forum](https://img.shields.io/badge/community-forum-00afd1.svg?style=flat-square)](https://forum.labstack.com)
+[![Twitter](https://img.shields.io/badge/twitter-@labstack-55acee.svg?style=flat-square)](https://twitter.com/labstack)
+[![License](http://img.shields.io/badge/license-mit-blue.svg?style=flat-square)](https://raw.githubusercontent.com/labstack/echo/master/LICENSE)
+
+## Supported Go versions
+
+As of version 4.0.0, Echo is available as a [Go module](https://github.com/golang/go/wiki/Modules).
+Therefore a Go version capable of understanding /vN suffixed imports is required:
+
+- 1.9.7+
+- 1.10.3+
+- 1.11+
+
+Any of these versions will allow you to import Echo as `github.com/labstack/echo/v4` which is the recommended
+way of using Echo going forward.
+
+For older versions, please use the latest v3 tag.
+
+## Feature Overview
+
+- Optimized HTTP router which smartly prioritize routes
+- Build robust and scalable RESTful APIs
+- Group APIs
+- Extensible middleware framework
+- Define middleware at root, group or route level
+- Data binding for JSON, XML and form payload
+- Handy functions to send variety of HTTP responses
+- Centralized HTTP error handling
+- Template rendering with any template engine
+- Define your format for the logger
+- Highly customizable
+- Automatic TLS via Let’s Encrypt
+- HTTP/2 support
+
+## Benchmarks
+
+Date: 2018/03/15<br>
+Source: https://github.com/vishr/web-framework-benchmark<br>
+Lower is better!
+
+<img src="https://i.imgur.com/I32VdMJ.png">
+
+## [Guide](https://echo.labstack.com/guide)
+
+### Example
+
+```go
+package main
+
+import (
+  "net/http"
+  "github.com/labstack/echo/v4"
+  "github.com/labstack/echo/v4/middleware"
+)
+
+func main() {
+  // Echo instance
+  e := echo.New()
+
+  // Middleware
+  e.Use(middleware.Logger())
+  e.Use(middleware.Recover())
+
+  // Routes
+  e.GET("/", hello)
+
+  // Start server
+  e.Logger.Fatal(e.Start(":1323"))
+}
+
+// Handler
+func hello(c echo.Context) error {
+  return c.String(http.StatusOK, "Hello, World!")
+}
+```
+
+## Help
+
+- [Forum](https://forum.labstack.com)
+- [Chat](https://gitter.im/labstack/echo)
+
+## Contribute
+
+**Use issues for everything**
+
+- For a small change, just send a PR.
+- For bigger changes open an issue for discussion before sending a PR.
+- PR should have:
+  - Test case
+  - Documentation
+  - Example (If it makes sense)
+- You can also contribute by:
+  - Reporting issues
+  - Suggesting new features or enhancements
+  - Improve/fix documentation
+
+## Credits
+
+- [Vishal Rana](https://github.com/vishr) - Author
+- [Nitin Rana](https://github.com/nr17) - Consultant
+- [Contributors](https://github.com/labstack/echo/graphs/contributors)
+
+## License
+
+[MIT](https://github.com/labstack/echo/blob/master/LICENSE)

vendor/github.com/labstack/echo/v4/bind.go

@@ -0,0 +1,311 @@
+package echo
+
+import (
+	"encoding"
+	"encoding/json"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"net/http"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+type (
+	// Binder is the interface that wraps the Bind method.
+	Binder interface {
+		Bind(i interface{}, c Context) error
+	}
+
+	// DefaultBinder is the default implementation of the Binder interface.
+	DefaultBinder struct{}
+
+	// BindUnmarshaler is the interface used to wrap the UnmarshalParam method.
+	// Types that don't implement this, but do implement encoding.TextUnmarshaler
+	// will use that interface instead.
+	BindUnmarshaler interface {
+		// UnmarshalParam decodes and assigns a value from an form or query param.
+		UnmarshalParam(param string) error
+	}
+)
+
+// Bind implements the `Binder#Bind` function.
+func (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {
+	req := c.Request()
+
+	names := c.ParamNames()
+	values := c.ParamValues()
+	params := map[string][]string{}
+	for i, name := range names {
+		params[name] = []string{values[i]}
+	}
+	if err := b.bindData(i, params, "param"); err != nil {
+		return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
+	}
+	if err = b.bindData(i, c.QueryParams(), "query"); err != nil {
+		return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
+	}
+	if req.ContentLength == 0 {
+		return
+	}
+	ctype := req.Header.Get(HeaderContentType)
+	switch {
+	case strings.HasPrefix(ctype, MIMEApplicationJSON):
+		if err = json.NewDecoder(req.Body).Decode(i); err != nil {
+			if ute, ok := err.(*json.UnmarshalTypeError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unmarshal type error: expected=%v, got=%v, field=%v, offset=%v", ute.Type, ute.Value, ute.Field, ute.Offset)).SetInternal(err)
+			} else if se, ok := err.(*json.SyntaxError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Syntax error: offset=%v, error=%v", se.Offset, se.Error())).SetInternal(err)
+			}
+			return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
+		}
+	case strings.HasPrefix(ctype, MIMEApplicationXML), strings.HasPrefix(ctype, MIMETextXML):
+		if err = xml.NewDecoder(req.Body).Decode(i); err != nil {
+			if ute, ok := err.(*xml.UnsupportedTypeError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unsupported type error: type=%v, error=%v", ute.Type, ute.Error())).SetInternal(err)
+			} else if se, ok := err.(*xml.SyntaxError); ok {
+				return NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Syntax error: line=%v, error=%v", se.Line, se.Error())).SetInternal(err)
+			}
+			return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
+		}
+	case strings.HasPrefix(ctype, MIMEApplicationForm), strings.HasPrefix(ctype, MIMEMultipartForm):
+		params, err := c.FormParams()
+		if err != nil {
+			return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
+		}
+		if err = b.bindData(i, params, "form"); err != nil {
+			return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
+		}
+	default:
+		return ErrUnsupportedMediaType
+	}
+	return
+}
+
+func (b *DefaultBinder) bindData(ptr interface{}, data map[string][]string, tag string) error {
+	if ptr == nil || len(data) == 0 {
+		return nil
+	}
+	typ := reflect.TypeOf(ptr).Elem()
+	val := reflect.ValueOf(ptr).Elem()
+
+	if m, ok := ptr.(*map[string]interface{}); ok {
+		for k, v := range data {
+			(*m)[k] = v[0]
+		}
+		return nil
+	}
+
+	if typ.Kind() != reflect.Struct {
+		return errors.New("binding element must be a struct")
+	}
+
+	for i := 0; i < typ.NumField(); i++ {
+		typeField := typ.Field(i)
+		structField := val.Field(i)
+		if !structField.CanSet() {
+			continue
+		}
+		structFieldKind := structField.Kind()
+		inputFieldName := typeField.Tag.Get(tag)
+
+		if inputFieldName == "" {
+			inputFieldName = typeField.Name
+			// If tag is nil, we inspect if the field is a struct.
+			if _, ok := bindUnmarshaler(structField); !ok && structFieldKind == reflect.Struct {
+				if err := b.bindData(structField.Addr().Interface(), data, tag); err != nil {
+					return err
+				}
+				continue
+			}
+		}
+
+		inputValue, exists := data[inputFieldName]
+		if !exists {
+			// Go json.Unmarshal supports case insensitive binding.  However the
+			// url params are bound case sensitive which is inconsistent.  To
+			// fix this we must check all of the map values in a
+			// case-insensitive search.
+			inputFieldName = strings.ToLower(inputFieldName)
+			for k, v := range data {
+				if strings.ToLower(k) == inputFieldName {
+					inputValue = v
+					exists = true
+					break
+				}
+			}
+		}
+
+		if !exists {
+			continue
+		}
+
+		// Call this first, in case we're dealing with an alias to an array type
+		if ok, err := unmarshalField(typeField.Type.Kind(), inputValue[0], structField); ok {
+			if err != nil {
+				return err
+			}
+			continue
+		}
+
+		numElems := len(inputValue)
+		if structFieldKind == reflect.Slice && numElems > 0 {
+			sliceOf := structField.Type().Elem().Kind()
+			slice := reflect.MakeSlice(structField.Type(), numElems, numElems)
+			for j := 0; j < numElems; j++ {
+				if err := setWithProperType(sliceOf, inputValue[j], slice.Index(j)); err != nil {
+					return err
+				}
+			}
+			val.Field(i).Set(slice)
+		} else if err := setWithProperType(typeField.Type.Kind(), inputValue[0], structField); err != nil {
+			return err
+
+		}
+	}
+	return nil
+}
+
+func setWithProperType(valueKind reflect.Kind, val string, structField reflect.Value) error {
+	// But also call it here, in case we're dealing with an array of BindUnmarshalers
+	if ok, err := unmarshalField(valueKind, val, structField); ok {
+		return err
+	}
+
+	switch valueKind {
+	case reflect.Ptr:
+		return setWithProperType(structField.Elem().Kind(), val, structField.Elem())
+	case reflect.Int:
+		return setIntField(val, 0, structField)
+	case reflect.Int8:
+		return setIntField(val, 8, structField)
+	case reflect.Int16:
+		return setIntField(val, 16, structField)
+	case reflect.Int32:
+		return setIntField(val, 32, structField)
+	case reflect.Int64:
+		return setIntField(val, 64, structField)
+	case reflect.Uint:
+		return setUintField(val, 0, structField)
+	case reflect.Uint8:
+		return setUintField(val, 8, structField)
+	case reflect.Uint16:
+		return setUintField(val, 16, structField)
+	case reflect.Uint32:
+		return setUintField(val, 32, structField)
+	case reflect.Uint64:
+		return setUintField(val, 64, structField)
+	case reflect.Bool:
+		return setBoolField(val, structField)
+	case reflect.Float32:
+		return setFloatField(val, 32, structField)
+	case reflect.Float64:
+		return setFloatField(val, 64, structField)
+	case reflect.String:
+		structField.SetString(val)
+	default:
+		return errors.New("unknown type")
+	}
+	return nil
+}
+
+func unmarshalField(valueKind reflect.Kind, val string, field reflect.Value) (bool, error) {
+	switch valueKind {
+	case reflect.Ptr:
+		return unmarshalFieldPtr(val, field)
+	default:
+		return unmarshalFieldNonPtr(val, field)
+	}
+}
+
+// bindUnmarshaler attempts to unmarshal a reflect.Value into a BindUnmarshaler
+func bindUnmarshaler(field reflect.Value) (BindUnmarshaler, bool) {
+	ptr := reflect.New(field.Type())
+	if ptr.CanInterface() {
+		iface := ptr.Interface()
+		if unmarshaler, ok := iface.(BindUnmarshaler); ok {
+			return unmarshaler, ok
+		}
+	}
+	return nil, false
+}
+
+// textUnmarshaler attempts to unmarshal a reflect.Value into a TextUnmarshaler
+func textUnmarshaler(field reflect.Value) (encoding.TextUnmarshaler, bool) {
+	ptr := reflect.New(field.Type())
+	if ptr.CanInterface() {
+		iface := ptr.Interface()
+		if unmarshaler, ok := iface.(encoding.TextUnmarshaler); ok {
+			return unmarshaler, ok
+		}
+	}
+	return nil, false
+}
+
+func unmarshalFieldNonPtr(value string, field reflect.Value) (bool, error) {
+	if unmarshaler, ok := bindUnmarshaler(field); ok {
+		err := unmarshaler.UnmarshalParam(value)
+		field.Set(reflect.ValueOf(unmarshaler).Elem())
+		return true, err
+	}
+	if unmarshaler, ok := textUnmarshaler(field); ok {
+		err := unmarshaler.UnmarshalText([]byte(value))
+		field.Set(reflect.ValueOf(unmarshaler).Elem())
+		return true, err
+	}
+
+	return false, nil
+}
+
+func unmarshalFieldPtr(value string, field reflect.Value) (bool, error) {
+	if field.IsNil() {
+		// Initialize the pointer to a nil value
+		field.Set(reflect.New(field.Type().Elem()))
+	}
+	return unmarshalFieldNonPtr(value, field.Elem())
+}
+
+func setIntField(value string, bitSize int, field reflect.Value) error {
+	if value == "" {
+		value = "0"
+	}
+	intVal, err := strconv.ParseInt(value, 10, bitSize)
+	if err == nil {
+		field.SetInt(intVal)
+	}
+	return err
+}
+
+func setUintField(value string, bitSize int, field reflect.Value) error {
+	if value == "" {
+		value = "0"
+	}
+	uintVal, err := strconv.ParseUint(value, 10, bitSize)
+	if err == nil {
+		field.SetUint(uintVal)
+	}
+	return err
+}
+
+func setBoolField(value string, field reflect.Value) error {
+	if value == "" {
+		value = "false"
+	}
+	boolVal, err := strconv.ParseBool(value)
+	if err == nil {
+		field.SetBool(boolVal)
+	}
+	return err
+}
+
+func setFloatField(value string, bitSize int, field reflect.Value) error {
+	if value == "" {
+		value = "0.0"
+	}
+	floatVal, err := strconv.ParseFloat(value, bitSize)
+	if err == nil {
+		field.SetFloat(floatVal)
+	}
+	return err
+}

vendor/github.com/labstack/echo/v4/context.go

@@ -0,0 +1,613 @@
+package echo
+
+import (
+	"bytes"
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+type (
+	// Context represents the context of the current HTTP request. It holds request and
+	// response objects, path, path parameters, data and registered handler.
+	Context interface {
+		// Request returns `*http.Request`.
+		Request() *http.Request
+
+		// SetRequest sets `*http.Request`.
+		SetRequest(r *http.Request)
+
+		// SetResponse sets `*Response`.
+		SetResponse(r *Response)
+
+		// Response returns `*Response`.
+		Response() *Response
+
+		// IsTLS returns true if HTTP connection is TLS otherwise false.
+		IsTLS() bool
+
+		// IsWebSocket returns true if HTTP connection is WebSocket otherwise false.
+		IsWebSocket() bool
+
+		// Scheme returns the HTTP protocol scheme, `http` or `https`.
+		Scheme() string
+
+		// RealIP returns the client's network address based on `X-Forwarded-For`
+		// or `X-Real-IP` request header.
+		RealIP() string
+
+		// Path returns the registered path for the handler.
+		Path() string
+
+		// SetPath sets the registered path for the handler.
+		SetPath(p string)
+
+		// Param returns path parameter by name.
+		Param(name string) string
+
+		// ParamNames returns path parameter names.
+		ParamNames() []string
+
+		// SetParamNames sets path parameter names.
+		SetParamNames(names ...string)
+
+		// ParamValues returns path parameter values.
+		ParamValues() []string
+
+		// SetParamValues sets path parameter values.
+		SetParamValues(values ...string)
+
+		// QueryParam returns the query param for the provided name.
+		QueryParam(name string) string
+
+		// QueryParams returns the query parameters as `url.Values`.
+		QueryParams() url.Values
+
+		// QueryString returns the URL query string.
+		QueryString() string
+
+		// FormValue returns the form field value for the provided name.
+		FormValue(name string) string
+
+		// FormParams returns the form parameters as `url.Values`.
+		FormParams() (url.Values, error)
+
+		// FormFile returns the multipart form file for the provided name.
+		FormFile(name string) (*multipart.FileHeader, error)
+
+		// MultipartForm returns the multipart form.
+		MultipartForm() (*multipart.Form, error)
+
+		// Cookie returns the named cookie provided in the request.
+		Cookie(name string) (*http.Cookie, error)
+
+		// SetCookie adds a `Set-Cookie` header in HTTP response.
+		SetCookie(cookie *http.Cookie)
+
+		// Cookies returns the HTTP cookies sent with the request.
+		Cookies() []*http.Cookie
+
+		// Get retrieves data from the context.
+		Get(key string) interface{}
+
+		// Set saves data in the context.
+		Set(key string, val interface{})
+
+		// Bind binds the request body into provided type `i`. The default binder
+		// does it based on Content-Type header.
+		Bind(i interface{}) error
+
+		// Validate validates provided `i`. It is usually called after `Context#Bind()`.
+		// Validator must be registered using `Echo#Validator`.
+		Validate(i interface{}) error
+
+		// Render renders a template with data and sends a text/html response with status
+		// code. Renderer must be registered using `Echo.Renderer`.
+		Render(code int, name string, data interface{}) error
+
+		// HTML sends an HTTP response with status code.
+		HTML(code int, html string) error
+
+		// HTMLBlob sends an HTTP blob response with status code.
+		HTMLBlob(code int, b []byte) error
+
+		// String sends a string response with status code.
+		String(code int, s string) error
+
+		// JSON sends a JSON response with status code.
+		JSON(code int, i interface{}) error
+
+		// JSONPretty sends a pretty-print JSON with status code.
+		JSONPretty(code int, i interface{}, indent string) error
+
+		// JSONBlob sends a JSON blob response with status code.
+		JSONBlob(code int, b []byte) error
+
+		// JSONP sends a JSONP response with status code. It uses `callback` to construct
+		// the JSONP payload.
+		JSONP(code int, callback string, i interface{}) error
+
+		// JSONPBlob sends a JSONP blob response with status code. It uses `callback`
+		// to construct the JSONP payload.
+		JSONPBlob(code int, callback string, b []byte) error
+
+		// XML sends an XML response with status code.
+		XML(code int, i interface{}) error
+
+		// XMLPretty sends a pretty-print XML with status code.
+		XMLPretty(code int, i interface{}, indent string) error
+
+		// XMLBlob sends an XML blob response with status code.
+		XMLBlob(code int, b []byte) error
+
+		// Blob sends a blob response with status code and content type.
+		Blob(code int, contentType string, b []byte) error
+
+		// Stream sends a streaming response with status code and content type.
+		Stream(code int, contentType string, r io.Reader) error
+
+		// File sends a response with the content of the file.
+		File(file string) error
+
+		// Attachment sends a response as attachment, prompting client to save the
+		// file.
+		Attachment(file string, name string) error
+
+		// Inline sends a response as inline, opening the file in the browser.
+		Inline(file string, name string) error
+
+		// NoContent sends a response with no body and a status code.
+		NoContent(code int) error
+
+		// Redirect redirects the request to a provided URL with status code.
+		Redirect(code int, url string) error
+
+		// Error invokes the registered HTTP error handler. Generally used by middleware.
+		Error(err error)
+
+		// Handler returns the matched handler by router.
+		Handler() HandlerFunc
+
+		// SetHandler sets the matched handler by router.
+		SetHandler(h HandlerFunc)
+
+		// Logger returns the `Logger` instance.
+		Logger() Logger
+
+		// Echo returns the `Echo` instance.
+		Echo() *Echo
+
+		// Reset resets the context after request completes. It must be called along
+		// with `Echo#AcquireContext()` and `Echo#ReleaseContext()`.
+		// See `Echo#ServeHTTP()`
+		Reset(r *http.Request, w http.ResponseWriter)
+	}
+
+	context struct {
+		request  *http.Request
+		response *Response
+		path     string
+		pnames   []string
+		pvalues  []string
+		query    url.Values
+		handler  HandlerFunc
+		store    Map
+		echo     *Echo
+		lock     sync.RWMutex
+	}
+)
+
+const (
+	defaultMemory = 32 << 20 // 32 MB
+	indexPage     = "index.html"
+	defaultIndent = "  "
+)
+
+func (c *context) writeContentType(value string) {
+	header := c.Response().Header()
+	if header.Get(HeaderContentType) == "" {
+		header.Set(HeaderContentType, value)
+	}
+}
+
+func (c *context) Request() *http.Request {
+	return c.request
+}
+
+func (c *context) SetRequest(r *http.Request) {
+	c.request = r
+}
+
+func (c *context) Response() *Response {
+	return c.response
+}
+
+func (c *context) SetResponse(r *Response) {
+	c.response = r
+}
+
+func (c *context) IsTLS() bool {
+	return c.request.TLS != nil
+}
+
+func (c *context) IsWebSocket() bool {
+	upgrade := c.request.Header.Get(HeaderUpgrade)
+	return strings.ToLower(upgrade) == "websocket"
+}
+
+func (c *context) Scheme() string {
+	// Can't use `r.Request.URL.Scheme`
+	// See: https://groups.google.com/forum/#!topic/golang-nuts/pMUkBlQBDF0
+	if c.IsTLS() {
+		return "https"
+	}
+	if scheme := c.request.Header.Get(HeaderXForwardedProto); scheme != "" {
+		return scheme
+	}
+	if scheme := c.request.Header.Get(HeaderXForwardedProtocol); scheme != "" {
+		return scheme
+	}
+	if ssl := c.request.Header.Get(HeaderXForwardedSsl); ssl == "on" {
+		return "https"
+	}
+	if scheme := c.request.Header.Get(HeaderXUrlScheme); scheme != "" {
+		return scheme
+	}
+	return "http"
+}
+
+func (c *context) RealIP() string {
+	if ip := c.request.Header.Get(HeaderXForwardedFor); ip != "" {
+		return strings.Split(ip, ", ")[0]
+	}
+	if ip := c.request.Header.Get(HeaderXRealIP); ip != "" {
+		return ip
+	}
+	ra, _, _ := net.SplitHostPort(c.request.RemoteAddr)
+	return ra
+}
+
+func (c *context) Path() string {
+	return c.path
+}
+
+func (c *context) SetPath(p string) {
+	c.path = p
+}
+
+func (c *context) Param(name string) string {
+	for i, n := range c.pnames {
+		if i < len(c.pvalues) {
+			if n == name {
+				return c.pvalues[i]
+			}
+		}
+	}
+	return ""
+}
+
+func (c *context) ParamNames() []string {
+	return c.pnames
+}
+
+func (c *context) SetParamNames(names ...string) {
+	c.pnames = names
+}
+
+func (c *context) ParamValues() []string {
+	return c.pvalues[:len(c.pnames)]
+}
+
+func (c *context) SetParamValues(values ...string) {
+	c.pvalues = values
+}
+
+func (c *context) QueryParam(name string) string {
+	if c.query == nil {
+		c.query = c.request.URL.Query()
+	}
+	return c.query.Get(name)
+}
+
+func (c *context) QueryParams() url.Values {
+	if c.query == nil {
+		c.query = c.request.URL.Query()
+	}
+	return c.query
+}
+
+func (c *context) QueryString() string {
+	return c.request.URL.RawQuery
+}
+
+func (c *context) FormValue(name string) string {
+	return c.request.FormValue(name)
+}
+
+func (c *context) FormParams() (url.Values, error) {
+	if strings.HasPrefix(c.request.Header.Get(HeaderContentType), MIMEMultipartForm) {
+		if err := c.request.ParseMultipartForm(defaultMemory); err != nil {
+			return nil, err
+		}
+	} else {
+		if err := c.request.ParseForm(); err != nil {
+			return nil, err
+		}
+	}
+	return c.request.Form, nil
+}
+
+func (c *context) FormFile(name string) (*multipart.FileHeader, error) {
+	_, fh, err := c.request.FormFile(name)
+	return fh, err
+}
+
+func (c *context) MultipartForm() (*multipart.Form, error) {
+	err := c.request.ParseMultipartForm(defaultMemory)
+	return c.request.MultipartForm, err
+}
+
+func (c *context) Cookie(name string) (*http.Cookie, error) {
+	return c.request.Cookie(name)
+}
+
+func (c *context) SetCookie(cookie *http.Cookie) {
+	http.SetCookie(c.Response(), cookie)
+}
+
+func (c *context) Cookies() []*http.Cookie {
+	return c.request.Cookies()
+}
+
+func (c *context) Get(key string) interface{} {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+	return c.store[key]
+}
+
+func (c *context) Set(key string, val interface{}) {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	if c.store == nil {
+		c.store = make(Map)
+	}
+	c.store[key] = val
+}
+
+func (c *context) Bind(i interface{}) error {
+	return c.echo.Binder.Bind(i, c)
+}
+
+func (c *context) Validate(i interface{}) error {
+	if c.echo.Validator == nil {
+		return ErrValidatorNotRegistered
+	}
+	return c.echo.Validator.Validate(i)
+}
+
+func (c *context) Render(code int, name string, data interface{}) (err error) {
+	if c.echo.Renderer == nil {
+		return ErrRendererNotRegistered
+	}
+	buf := new(bytes.Buffer)
+	if err = c.echo.Renderer.Render(buf, name, data, c); err != nil {
+		return
+	}
+	return c.HTMLBlob(code, buf.Bytes())
+}
+
+func (c *context) HTML(code int, html string) (err error) {
+	return c.HTMLBlob(code, []byte(html))
+}
+
+func (c *context) HTMLBlob(code int, b []byte) (err error) {
+	return c.Blob(code, MIMETextHTMLCharsetUTF8, b)
+}
+
+func (c *context) String(code int, s string) (err error) {
+	return c.Blob(code, MIMETextPlainCharsetUTF8, []byte(s))
+}
+
+func (c *context) jsonPBlob(code int, callback string, i interface{}) (err error) {
+	enc := json.NewEncoder(c.response)
+	_, pretty := c.QueryParams()["pretty"]
+	if c.echo.Debug || pretty {
+		enc.SetIndent("", "  ")
+	}
+	c.writeContentType(MIMEApplicationJavaScriptCharsetUTF8)
+	c.response.WriteHeader(code)
+	if _, err = c.response.Write([]byte(callback + "(")); err != nil {
+		return
+	}
+	if err = enc.Encode(i); err != nil {
+		return
+	}
+	if _, err = c.response.Write([]byte(");")); err != nil {
+		return
+	}
+	return
+}
+
+func (c *context) json(code int, i interface{}, indent string) error {
+	enc := json.NewEncoder(c.response)
+	if indent != "" {
+		enc.SetIndent("", indent)
+	}
+	c.writeContentType(MIMEApplicationJSONCharsetUTF8)
+	c.response.Status = code
+	return enc.Encode(i)
+}
+
+func (c *context) JSON(code int, i interface{}) (err error) {
+	indent := ""
+	if _, pretty := c.QueryParams()["pretty"]; c.echo.Debug || pretty {
+		indent = defaultIndent
+	}
+	return c.json(code, i, indent)
+}
+
+func (c *context) JSONPretty(code int, i interface{}, indent string) (err error) {
+	return c.json(code, i, indent)
+}
+
+func (c *context) JSONBlob(code int, b []byte) (err error) {
+	return c.Blob(code, MIMEApplicationJSONCharsetUTF8, b)
+}
+
+func (c *context) JSONP(code int, callback string, i interface{}) (err error) {
+	return c.jsonPBlob(code, callback, i)
+}
+
+func (c *context) JSONPBlob(code int, callback string, b []byte) (err error) {
+	c.writeContentType(MIMEApplicationJavaScriptCharsetUTF8)
+	c.response.WriteHeader(code)
+	if _, err = c.response.Write([]byte(callback + "(")); err != nil {
+		return
+	}
+	if _, err = c.response.Write(b); err != nil {
+		return
+	}
+	_, err = c.response.Write([]byte(");"))
+	return
+}
+
+func (c *context) xml(code int, i interface{}, indent string) (err error) {
+	c.writeContentType(MIMEApplicationXMLCharsetUTF8)
+	c.response.WriteHeader(code)
+	enc := xml.NewEncoder(c.response)
+	if indent != "" {
+		enc.Indent("", indent)
+	}
+	if _, err = c.response.Write([]byte(xml.Header)); err != nil {
+		return
+	}
+	return enc.Encode(i)
+}
+
+func (c *context) XML(code int, i interface{}) (err error) {
+	indent := ""
+	if _, pretty := c.QueryParams()["pretty"]; c.echo.Debug || pretty {
+		indent = defaultIndent
+	}
+	return c.xml(code, i, indent)
+}
+
+func (c *context) XMLPretty(code int, i interface{}, indent string) (err error) {
+	return c.xml(code, i, indent)
+}
+
+func (c *context) XMLBlob(code int, b []byte) (err error) {
+	c.writeContentType(MIMEApplicationXMLCharsetUTF8)
+	c.response.WriteHeader(code)
+	if _, err = c.response.Write([]byte(xml.Header)); err != nil {
+		return
+	}
+	_, err = c.response.Write(b)
+	return
+}
+
+func (c *context) Blob(code int, contentType string, b []byte) (err error) {
+	c.writeContentType(contentType)
+	c.response.WriteHeader(code)
+	_, err = c.response.Write(b)
+	return
+}
+
+func (c *context) Stream(code int, contentType string, r io.Reader) (err error) {
+	c.writeContentType(contentType)
+	c.response.WriteHeader(code)
+	_, err = io.Copy(c.response, r)
+	return
+}
+
+func (c *context) File(file string) (err error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return NotFoundHandler(c)
+	}
+	defer f.Close()
+
+	fi, _ := f.Stat()
+	if fi.IsDir() {
+		file = filepath.Join(file, indexPage)
+		f, err = os.Open(file)
+		if err != nil {
+			return NotFoundHandler(c)
+		}
+		defer f.Close()
+		if fi, err = f.Stat(); err != nil {
+			return
+		}
+	}
+	http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), f)
+	return
+}
+
+func (c *context) Attachment(file, name string) error {
+	return c.contentDisposition(file, name, "attachment")
+}
+
+func (c *context) Inline(file, name string) error {
+	return c.contentDisposition(file, name, "inline")
+}
+
+func (c *context) contentDisposition(file, name, dispositionType string) error {
+	c.response.Header().Set(HeaderContentDisposition, fmt.Sprintf("%s; filename=%q", dispositionType, name))
+	return c.File(file)
+}
+
+func (c *context) NoContent(code int) error {
+	c.response.WriteHeader(code)
+	return nil
+}
+
+func (c *context) Redirect(code int, url string) error {
+	if code < 300 || code > 308 {
+		return ErrInvalidRedirectCode
+	}
+	c.response.Header().Set(HeaderLocation, url)
+	c.response.WriteHeader(code)
+	return nil
+}
+
+func (c *context) Error(err error) {
+	c.echo.HTTPErrorHandler(err, c)
+}
+
+func (c *context) Echo() *Echo {
+	return c.echo
+}
+
+func (c *context) Handler() HandlerFunc {
+	return c.handler
+}
+
+func (c *context) SetHandler(h HandlerFunc) {
+	c.handler = h
+}
+
+func (c *context) Logger() Logger {
+	return c.echo.Logger
+}
+
+func (c *context) Reset(r *http.Request, w http.ResponseWriter) {
+	c.request = r
+	c.response.reset(w)
+	c.query = nil
+	c.handler = NotFoundHandler
+	c.store = nil
+	c.path = ""
+	c.pnames = nil
+	// NOTE: Don't reset because it has to have length c.echo.maxParam at all times
+	// c.pvalues = nil
+}

vendor/github.com/labstack/echo/v4/echo.go

@@ -0,0 +1,844 @@
+/*
+Package echo implements high performance, minimalist Go web framework.
+
+Example:
+
+  package main
+
+  import (
+    "net/http"
+
+    "github.com/labstack/echo/v4"
+    "github.com/labstack/echo/v4/middleware"
+  )
+
+  // Handler
+  func hello(c echo.Context) error {
+    return c.String(http.StatusOK, "Hello, World!")
+  }
+
+  func main() {
+    // Echo instance
+    e := echo.New()
+
+    // Middleware
+    e.Use(middleware.Logger())
+    e.Use(middleware.Recover())
+
+    // Routes
+    e.GET("/", hello)
+
+    // Start server
+    e.Logger.Fatal(e.Start(":1323"))
+  }
+
+Learn more at https://echo.labstack.com
+*/
+package echo
+
+import (
+	"bytes"
+	stdContext "context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	stdLog "log"
+	"net"
+	"net/http"
+	"net/url"
+	"path"
+	"path/filepath"
+	"reflect"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/labstack/gommon/color"
+	"github.com/labstack/gommon/log"
+	"golang.org/x/crypto/acme"
+	"golang.org/x/crypto/acme/autocert"
+)
+
+type (
+	// Echo is the top-level framework instance.
+	Echo struct {
+		common
+		StdLogger        *stdLog.Logger
+		colorer          *color.Color
+		premiddleware    []MiddlewareFunc
+		middleware       []MiddlewareFunc
+		maxParam         *int
+		router           *Router
+		routers          map[string]*Router
+		notFoundHandler  HandlerFunc
+		pool             sync.Pool
+		Server           *http.Server
+		TLSServer        *http.Server
+		Listener         net.Listener
+		TLSListener      net.Listener
+		AutoTLSManager   autocert.Manager
+		DisableHTTP2     bool
+		Debug            bool
+		HideBanner       bool
+		HidePort         bool
+		HTTPErrorHandler HTTPErrorHandler
+		Binder           Binder
+		Validator        Validator
+		Renderer         Renderer
+		Logger           Logger
+	}
+
+	// Route contains a handler and information for matching against requests.
+	Route struct {
+		Method string `json:"method"`
+		Path   string `json:"path"`
+		Name   string `json:"name"`
+	}
+
+	// HTTPError represents an error that occurred while handling a request.
+	HTTPError struct {
+		Code     int         `json:"-"`
+		Message  interface{} `json:"message"`
+		Internal error       `json:"-"` // Stores the error returned by an external dependency
+	}
+
+	// MiddlewareFunc defines a function to process middleware.
+	MiddlewareFunc func(HandlerFunc) HandlerFunc
+
+	// HandlerFunc defines a function to serve HTTP requests.
+	HandlerFunc func(Context) error
+
+	// HTTPErrorHandler is a centralized HTTP error handler.
+	HTTPErrorHandler func(error, Context)
+
+	// Validator is the interface that wraps the Validate function.
+	Validator interface {
+		Validate(i interface{}) error
+	}
+
+	// Renderer is the interface that wraps the Render function.
+	Renderer interface {
+		Render(io.Writer, string, interface{}, Context) error
+	}
+
+	// Map defines a generic map of type `map[string]interface{}`.
+	Map map[string]interface{}
+
+	// Common struct for Echo & Group.
+	common struct{}
+)
+
+// HTTP methods
+// NOTE: Deprecated, please use the stdlib constants directly instead.
+const (
+	CONNECT = http.MethodConnect
+	DELETE  = http.MethodDelete
+	GET     = http.MethodGet
+	HEAD    = http.MethodHead
+	OPTIONS = http.MethodOptions
+	PATCH   = http.MethodPatch
+	POST    = http.MethodPost
+	// PROPFIND = "PROPFIND"
+	PUT   = http.MethodPut
+	TRACE = http.MethodTrace
+)
+
+// MIME types
+const (
+	MIMEApplicationJSON                  = "application/json"
+	MIMEApplicationJSONCharsetUTF8       = MIMEApplicationJSON + "; " + charsetUTF8
+	MIMEApplicationJavaScript            = "application/javascript"
+	MIMEApplicationJavaScriptCharsetUTF8 = MIMEApplicationJavaScript + "; " + charsetUTF8
+	MIMEApplicationXML                   = "application/xml"
+	MIMEApplicationXMLCharsetUTF8        = MIMEApplicationXML + "; " + charsetUTF8
+	MIMETextXML                          = "text/xml"
+	MIMETextXMLCharsetUTF8               = MIMETextXML + "; " + charsetUTF8
+	MIMEApplicationForm                  = "application/x-www-form-urlencoded"
+	MIMEApplicationProtobuf              = "application/protobuf"
+	MIMEApplicationMsgpack               = "application/msgpack"
+	MIMETextHTML                         = "text/html"
+	MIMETextHTMLCharsetUTF8              = MIMETextHTML + "; " + charsetUTF8
+	MIMETextPlain                        = "text/plain"
+	MIMETextPlainCharsetUTF8             = MIMETextPlain + "; " + charsetUTF8
+	MIMEMultipartForm                    = "multipart/form-data"
+	MIMEOctetStream                      = "application/octet-stream"
+)
+
+const (
+	charsetUTF8 = "charset=UTF-8"
+	// PROPFIND Method can be used on collection and property resources.
+	PROPFIND = "PROPFIND"
+	// REPORT Method can be used to get information about a resource, see rfc 3253
+	REPORT = "REPORT"
+)
+
+// Headers
+const (
+	HeaderAccept              = "Accept"
+	HeaderAcceptEncoding      = "Accept-Encoding"
+	HeaderAllow               = "Allow"
+	HeaderAuthorization       = "Authorization"
+	HeaderContentDisposition  = "Content-Disposition"
+	HeaderContentEncoding     = "Content-Encoding"
+	HeaderContentLength       = "Content-Length"
+	HeaderContentType         = "Content-Type"
+	HeaderCookie              = "Cookie"
+	HeaderSetCookie           = "Set-Cookie"
+	HeaderIfModifiedSince     = "If-Modified-Since"
+	HeaderLastModified        = "Last-Modified"
+	HeaderLocation            = "Location"
+	HeaderUpgrade             = "Upgrade"
+	HeaderVary                = "Vary"
+	HeaderWWWAuthenticate     = "WWW-Authenticate"
+	HeaderXForwardedFor       = "X-Forwarded-For"
+	HeaderXForwardedProto     = "X-Forwarded-Proto"
+	HeaderXForwardedProtocol  = "X-Forwarded-Protocol"
+	HeaderXForwardedSsl       = "X-Forwarded-Ssl"
+	HeaderXUrlScheme          = "X-Url-Scheme"
+	HeaderXHTTPMethodOverride = "X-HTTP-Method-Override"
+	HeaderXRealIP             = "X-Real-IP"
+	HeaderXRequestID          = "X-Request-ID"
+	HeaderXRequestedWith      = "X-Requested-With"
+	HeaderServer              = "Server"
+	HeaderOrigin              = "Origin"
+
+	// Access control
+	HeaderAccessControlRequestMethod    = "Access-Control-Request-Method"
+	HeaderAccessControlRequestHeaders   = "Access-Control-Request-Headers"
+	HeaderAccessControlAllowOrigin      = "Access-Control-Allow-Origin"
+	HeaderAccessControlAllowMethods     = "Access-Control-Allow-Methods"
+	HeaderAccessControlAllowHeaders     = "Access-Control-Allow-Headers"
+	HeaderAccessControlAllowCredentials = "Access-Control-Allow-Credentials"
+	HeaderAccessControlExposeHeaders    = "Access-Control-Expose-Headers"
+	HeaderAccessControlMaxAge           = "Access-Control-Max-Age"
+
+	// Security
+	HeaderStrictTransportSecurity         = "Strict-Transport-Security"
+	HeaderXContentTypeOptions             = "X-Content-Type-Options"
+	HeaderXXSSProtection                  = "X-XSS-Protection"
+	HeaderXFrameOptions                   = "X-Frame-Options"
+	HeaderContentSecurityPolicy           = "Content-Security-Policy"
+	HeaderContentSecurityPolicyReportOnly = "Content-Security-Policy-Report-Only"
+	HeaderXCSRFToken                      = "X-CSRF-Token"
+	HeaderReferrerPolicy                  = "Referrer-Policy"
+)
+
+const (
+	// Version of Echo
+	Version = "4.1.11"
+	website = "https://echo.labstack.com"
+	// http://patorjk.com/software/taag/#p=display&f=Small%20Slant&t=Echo
+	banner = `
+   ____    __
+  / __/___/ /  ___
+ / _// __/ _ \/ _ \
+/___/\__/_//_/\___/ %s
+High performance, minimalist Go web framework
+%s
+____________________________________O/_______
+                                    O\
+`
+)
+
+var (
+	methods = [...]string{
+		http.MethodConnect,
+		http.MethodDelete,
+		http.MethodGet,
+		http.MethodHead,
+		http.MethodOptions,
+		http.MethodPatch,
+		http.MethodPost,
+		PROPFIND,
+		http.MethodPut,
+		http.MethodTrace,
+		REPORT,
+	}
+)
+
+// Errors
+var (
+	ErrUnsupportedMediaType        = NewHTTPError(http.StatusUnsupportedMediaType)
+	ErrNotFound                    = NewHTTPError(http.StatusNotFound)
+	ErrUnauthorized                = NewHTTPError(http.StatusUnauthorized)
+	ErrForbidden                   = NewHTTPError(http.StatusForbidden)
+	ErrMethodNotAllowed            = NewHTTPError(http.StatusMethodNotAllowed)
+	ErrStatusRequestEntityTooLarge = NewHTTPError(http.StatusRequestEntityTooLarge)
+	ErrTooManyRequests             = NewHTTPError(http.StatusTooManyRequests)
+	ErrBadRequest                  = NewHTTPError(http.StatusBadRequest)
+	ErrBadGateway                  = NewHTTPError(http.StatusBadGateway)
+	ErrInternalServerError         = NewHTTPError(http.StatusInternalServerError)
+	ErrRequestTimeout              = NewHTTPError(http.StatusRequestTimeout)
+	ErrServiceUnavailable          = NewHTTPError(http.StatusServiceUnavailable)
+	ErrValidatorNotRegistered      = errors.New("validator not registered")
+	ErrRendererNotRegistered       = errors.New("renderer not registered")
+	ErrInvalidRedirectCode         = errors.New("invalid redirect status code")
+	ErrCookieNotFound              = errors.New("cookie not found")
+	ErrInvalidCertOrKeyType        = errors.New("invalid cert or key type, must be string or []byte")
+)
+
+// Error handlers
+var (
+	NotFoundHandler = func(c Context) error {
+		return ErrNotFound
+	}
+
+	MethodNotAllowedHandler = func(c Context) error {
+		return ErrMethodNotAllowed
+	}
+)
+
+// New creates an instance of Echo.
+func New() (e *Echo) {
+	e = &Echo{
+		Server:    new(http.Server),
+		TLSServer: new(http.Server),
+		AutoTLSManager: autocert.Manager{
+			Prompt: autocert.AcceptTOS,
+		},
+		Logger:   log.New("echo"),
+		colorer:  color.New(),
+		maxParam: new(int),
+	}
+	e.Server.Handler = e
+	e.TLSServer.Handler = e
+	e.HTTPErrorHandler = e.DefaultHTTPErrorHandler
+	e.Binder = &DefaultBinder{}
+	e.Logger.SetLevel(log.ERROR)
+	e.StdLogger = stdLog.New(e.Logger.Output(), e.Logger.Prefix()+": ", 0)
+	e.pool.New = func() interface{} {
+		return e.NewContext(nil, nil)
+	}
+	e.router = NewRouter(e)
+	e.routers = map[string]*Router{}
+	return
+}
+
+// NewContext returns a Context instance.
+func (e *Echo) NewContext(r *http.Request, w http.ResponseWriter) Context {
+	return &context{
+		request:  r,
+		response: NewResponse(w, e),
+		store:    make(Map),
+		echo:     e,
+		pvalues:  make([]string, *e.maxParam),
+		handler:  NotFoundHandler,
+	}
+}
+
+// Router returns the default router.
+func (e *Echo) Router() *Router {
+	return e.router
+}
+
+// Routers returns the map of host => router.
+func (e *Echo) Routers() map[string]*Router {
+	return e.routers
+}
+
+// DefaultHTTPErrorHandler is the default HTTP error handler. It sends a JSON response
+// with status code.
+func (e *Echo) DefaultHTTPErrorHandler(err error, c Context) {
+	he, ok := err.(*HTTPError)
+	if ok {
+		if he.Internal != nil {
+			if herr, ok := he.Internal.(*HTTPError); ok {
+				he = herr
+			}
+		}
+	} else {
+		he = &HTTPError{
+			Code:    http.StatusInternalServerError,
+			Message: http.StatusText(http.StatusInternalServerError),
+		}
+	}
+	if e.Debug {
+		he.Message = err.Error()
+	} else if m, ok := he.Message.(string); ok {
+		he.Message = Map{"message": m}
+	}
+
+	// Send response
+	if !c.Response().Committed {
+		if c.Request().Method == http.MethodHead { // Issue #608
+			err = c.NoContent(he.Code)
+		} else {
+			err = c.JSON(he.Code, he.Message)
+		}
+		if err != nil {
+			e.Logger.Error(err)
+		}
+	}
+}
+
+// Pre adds middleware to the chain which is run before router.
+func (e *Echo) Pre(middleware ...MiddlewareFunc) {
+	e.premiddleware = append(e.premiddleware, middleware...)
+}
+
+// Use adds middleware to the chain which is run after router.
+func (e *Echo) Use(middleware ...MiddlewareFunc) {
+	e.middleware = append(e.middleware, middleware...)
+}
+
+// CONNECT registers a new CONNECT route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodConnect, path, h, m...)
+}
+
+// DELETE registers a new DELETE route for a path with matching handler in the router
+// with optional route-level middleware.
+func (e *Echo) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodDelete, path, h, m...)
+}
+
+// GET registers a new GET route for a path with matching handler in the router
+// with optional route-level middleware.
+func (e *Echo) GET(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodGet, path, h, m...)
+}
+
+// HEAD registers a new HEAD route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodHead, path, h, m...)
+}
+
+// OPTIONS registers a new OPTIONS route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodOptions, path, h, m...)
+}
+
+// PATCH registers a new PATCH route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodPatch, path, h, m...)
+}
+
+// POST registers a new POST route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) POST(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodPost, path, h, m...)
+}
+
+// PUT registers a new PUT route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) PUT(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodPut, path, h, m...)
+}
+
+// TRACE registers a new TRACE route for a path with matching handler in the
+// router with optional route-level middleware.
+func (e *Echo) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return e.Add(http.MethodTrace, path, h, m...)
+}
+
+// Any registers a new route for all HTTP methods and path with matching handler
+// in the router with optional route-level middleware.
+func (e *Echo) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc) []*Route {
+	routes := make([]*Route, len(methods))
+	for i, m := range methods {
+		routes[i] = e.Add(m, path, handler, middleware...)
+	}
+	return routes
+}
+
+// Match registers a new route for multiple HTTP methods and path with matching
+// handler in the router with optional route-level middleware.
+func (e *Echo) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc) []*Route {
+	routes := make([]*Route, len(methods))
+	for i, m := range methods {
+		routes[i] = e.Add(m, path, handler, middleware...)
+	}
+	return routes
+}
+
+// Static registers a new route with path prefix to serve static files from the
+// provided root directory.
+func (e *Echo) Static(prefix, root string) *Route {
+	if root == "" {
+		root = "." // For security we want to restrict to CWD.
+	}
+	return e.static(prefix, root, e.GET)
+}
+
+func (common) static(prefix, root string, get func(string, HandlerFunc, ...MiddlewareFunc) *Route) *Route {
+	h := func(c Context) error {
+		p, err := url.PathUnescape(c.Param("*"))
+		if err != nil {
+			return err
+		}
+		name := filepath.Join(root, path.Clean("/"+p)) // "/"+ for security
+		return c.File(name)
+	}
+	if prefix == "/" {
+		return get(prefix+"*", h)
+	}
+	return get(prefix+"/*", h)
+}
+
+func (common) file(path, file string, get func(string, HandlerFunc, ...MiddlewareFunc) *Route,
+	m ...MiddlewareFunc) *Route {
+	return get(path, func(c Context) error {
+		return c.File(file)
+	}, m...)
+}
+
+// File registers a new route with path to serve a static file with optional route-level middleware.
+func (e *Echo) File(path, file string, m ...MiddlewareFunc) *Route {
+	return e.file(path, file, e.GET, m...)
+}
+
+func (e *Echo) add(host, method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
+	name := handlerName(handler)
+	router := e.findRouter(host)
+	router.Add(method, path, func(c Context) error {
+		h := handler
+		// Chain middleware
+		for i := len(middleware) - 1; i >= 0; i-- {
+			h = middleware[i](h)
+		}
+		return h(c)
+	})
+	r := &Route{
+		Method: method,
+		Path:   path,
+		Name:   name,
+	}
+	e.router.routes[method+path] = r
+	return r
+}
+
+// Add registers a new route for an HTTP method and path with matching handler
+// in the router with optional route-level middleware.
+func (e *Echo) Add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
+	return e.add("", method, path, handler, middleware...)
+}
+
+// Host creates a new router group for the provided host and optional host-level middleware.
+func (e *Echo) Host(name string, m ...MiddlewareFunc) (g *Group) {
+	e.routers[name] = NewRouter(e)
+	g = &Group{host: name, echo: e}
+	g.Use(m...)
+	return
+}
+
+// Group creates a new router group with prefix and optional group-level middleware.
+func (e *Echo) Group(prefix string, m ...MiddlewareFunc) (g *Group) {
+	g = &Group{prefix: prefix, echo: e}
+	g.Use(m...)
+	return
+}
+
+// URI generates a URI from handler.
+func (e *Echo) URI(handler HandlerFunc, params ...interface{}) string {
+	name := handlerName(handler)
+	return e.Reverse(name, params...)
+}
+
+// URL is an alias for `URI` function.
+func (e *Echo) URL(h HandlerFunc, params ...interface{}) string {
+	return e.URI(h, params...)
+}
+
+// Reverse generates an URL from route name and provided parameters.
+func (e *Echo) Reverse(name string, params ...interface{}) string {
+	uri := new(bytes.Buffer)
+	ln := len(params)
+	n := 0
+	for _, r := range e.router.routes {
+		if r.Name == name {
+			for i, l := 0, len(r.Path); i < l; i++ {
+				if r.Path[i] == ':' && n < ln {
+					for ; i < l && r.Path[i] != '/'; i++ {
+					}
+					uri.WriteString(fmt.Sprintf("%v", params[n]))
+					n++
+				}
+				if i < l {
+					uri.WriteByte(r.Path[i])
+				}
+			}
+			break
+		}
+	}
+	return uri.String()
+}
+
+// Routes returns the registered routes.
+func (e *Echo) Routes() []*Route {
+	routes := make([]*Route, 0, len(e.router.routes))
+	for _, v := range e.router.routes {
+		routes = append(routes, v)
+	}
+	return routes
+}
+
+// AcquireContext returns an empty `Context` instance from the pool.
+// You must return the context by calling `ReleaseContext()`.
+func (e *Echo) AcquireContext() Context {
+	return e.pool.Get().(Context)
+}
+
+// ReleaseContext returns the `Context` instance back to the pool.
+// You must call it after `AcquireContext()`.
+func (e *Echo) ReleaseContext(c Context) {
+	e.pool.Put(c)
+}
+
+// ServeHTTP implements `http.Handler` interface, which serves HTTP requests.
+func (e *Echo) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Acquire context
+	c := e.pool.Get().(*context)
+	c.Reset(r, w)
+
+	h := NotFoundHandler
+
+	if e.premiddleware == nil {
+		e.findRouter(r.Host).Find(r.Method, getPath(r), c)
+		h = c.Handler()
+		h = applyMiddleware(h, e.middleware...)
+	} else {
+		h = func(c Context) error {
+			e.findRouter(r.Host).Find(r.Method, getPath(r), c)
+			h := c.Handler()
+			h = applyMiddleware(h, e.middleware...)
+			return h(c)
+		}
+		h = applyMiddleware(h, e.premiddleware...)
+	}
+
+	// Execute chain
+	if err := h(c); err != nil {
+		e.HTTPErrorHandler(err, c)
+	}
+
+	// Release context
+	e.pool.Put(c)
+}
+
+// Start starts an HTTP server.
+func (e *Echo) Start(address string) error {
+	e.Server.Addr = address
+	return e.StartServer(e.Server)
+}
+
+// StartTLS starts an HTTPS server.
+// If `certFile` or `keyFile` is `string` the values are treated as file paths.
+// If `certFile` or `keyFile` is `[]byte` the values are treated as the certificate or key as-is.
+func (e *Echo) StartTLS(address string, certFile, keyFile interface{}) (err error) {
+	var cert []byte
+	if cert, err = filepathOrContent(certFile); err != nil {
+		return
+	}
+
+	var key []byte
+	if key, err = filepathOrContent(keyFile); err != nil {
+		return
+	}
+
+	s := e.TLSServer
+	s.TLSConfig = new(tls.Config)
+	s.TLSConfig.Certificates = make([]tls.Certificate, 1)
+	if s.TLSConfig.Certificates[0], err = tls.X509KeyPair(cert, key); err != nil {
+		return
+	}
+
+	return e.startTLS(address)
+}
+
+func filepathOrContent(fileOrContent interface{}) (content []byte, err error) {
+	switch v := fileOrContent.(type) {
+	case string:
+		return ioutil.ReadFile(v)
+	case []byte:
+		return v, nil
+	default:
+		return nil, ErrInvalidCertOrKeyType
+	}
+}
+
+// StartAutoTLS starts an HTTPS server using certificates automatically installed from https://letsencrypt.org.
+func (e *Echo) StartAutoTLS(address string) error {
+	s := e.TLSServer
+	s.TLSConfig = new(tls.Config)
+	s.TLSConfig.GetCertificate = e.AutoTLSManager.GetCertificate
+	s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, acme.ALPNProto)
+	return e.startTLS(address)
+}
+
+func (e *Echo) startTLS(address string) error {
+	s := e.TLSServer
+	s.Addr = address
+	if !e.DisableHTTP2 {
+		s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, "h2")
+	}
+	return e.StartServer(e.TLSServer)
+}
+
+// StartServer starts a custom http server.
+func (e *Echo) StartServer(s *http.Server) (err error) {
+	// Setup
+	e.colorer.SetOutput(e.Logger.Output())
+	s.ErrorLog = e.StdLogger
+	s.Handler = e
+	if e.Debug {
+		e.Logger.SetLevel(log.DEBUG)
+	}
+
+	if !e.HideBanner {
+		e.colorer.Printf(banner, e.colorer.Red("v"+Version), e.colorer.Blue(website))
+	}
+
+	if s.TLSConfig == nil {
+		if e.Listener == nil {
+			e.Listener, err = newListener(s.Addr)
+			if err != nil {
+				return err
+			}
+		}
+		if !e.HidePort {
+			e.colorer.Printf("⇨ http server started on %s\n", e.colorer.Green(e.Listener.Addr()))
+		}
+		return s.Serve(e.Listener)
+	}
+	if e.TLSListener == nil {
+		l, err := newListener(s.Addr)
+		if err != nil {
+			return err
+		}
+		e.TLSListener = tls.NewListener(l, s.TLSConfig)
+	}
+	if !e.HidePort {
+		e.colorer.Printf("⇨ https server started on %s\n", e.colorer.Green(e.TLSListener.Addr()))
+	}
+	return s.Serve(e.TLSListener)
+}
+
+// Close immediately stops the server.
+// It internally calls `http.Server#Close()`.
+func (e *Echo) Close() error {
+	if err := e.TLSServer.Close(); err != nil {
+		return err
+	}
+	return e.Server.Close()
+}
+
+// Shutdown stops the server gracefully.
+// It internally calls `http.Server#Shutdown()`.
+func (e *Echo) Shutdown(ctx stdContext.Context) error {
+	if err := e.TLSServer.Shutdown(ctx); err != nil {
+		return err
+	}
+	return e.Server.Shutdown(ctx)
+}
+
+// NewHTTPError creates a new HTTPError instance.
+func NewHTTPError(code int, message ...interface{}) *HTTPError {
+	he := &HTTPError{Code: code, Message: http.StatusText(code)}
+	if len(message) > 0 {
+		he.Message = message[0]
+	}
+	return he
+}
+
+// Error makes it compatible with `error` interface.
+func (he *HTTPError) Error() string {
+	return fmt.Sprintf("code=%d, message=%v, internal=%v", he.Code, he.Message, he.Internal)
+}
+
+// SetInternal sets error to HTTPError.Internal
+func (he *HTTPError) SetInternal(err error) *HTTPError {
+	he.Internal = err
+	return he
+}
+
+// WrapHandler wraps `http.Handler` into `echo.HandlerFunc`.
+func WrapHandler(h http.Handler) HandlerFunc {
+	return func(c Context) error {
+		h.ServeHTTP(c.Response(), c.Request())
+		return nil
+	}
+}
+
+// WrapMiddleware wraps `func(http.Handler) http.Handler` into `echo.MiddlewareFunc`
+func WrapMiddleware(m func(http.Handler) http.Handler) MiddlewareFunc {
+	return func(next HandlerFunc) HandlerFunc {
+		return func(c Context) (err error) {
+			m(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				c.SetRequest(r)
+				c.SetResponse(NewResponse(w, c.Echo()))
+				err = next(c)
+			})).ServeHTTP(c.Response(), c.Request())
+			return
+		}
+	}
+}
+
+func getPath(r *http.Request) string {
+	path := r.URL.RawPath
+	if path == "" {
+		path = r.URL.Path
+	}
+	return path
+}
+
+func (e *Echo) findRouter(host string) *Router {
+	if len(e.routers) > 0 {
+		if r, ok := e.routers[host]; ok {
+			return r
+		}
+	}
+	return e.router
+}
+
+func handlerName(h HandlerFunc) string {
+	t := reflect.ValueOf(h).Type()
+	if t.Kind() == reflect.Func {
+		return runtime.FuncForPC(reflect.ValueOf(h).Pointer()).Name()
+	}
+	return t.String()
+}
+
+// // PathUnescape is wraps `url.PathUnescape`
+// func PathUnescape(s string) (string, error) {
+// 	return url.PathUnescape(s)
+// }
+
+// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
+// connections. It's used by ListenAndServe and ListenAndServeTLS so
+// dead TCP connections (e.g. closing laptop mid-download) eventually
+// go away.
+type tcpKeepAliveListener struct {
+	*net.TCPListener
+}
+
+func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
+	if c, err = ln.AcceptTCP(); err != nil {
+		return
+	} else if err = c.(*net.TCPConn).SetKeepAlive(true); err != nil {
+		return
+	} else if err = c.(*net.TCPConn).SetKeepAlivePeriod(3 * time.Minute); err != nil {
+		return
+	}
+	return
+}
+
+func newListener(address string) (*tcpKeepAliveListener, error) {
+	l, err := net.Listen("tcp", address)
+	if err != nil {
+		return nil, err
+	}
+	return &tcpKeepAliveListener{l.(*net.TCPListener)}, nil
+}
+
+func applyMiddleware(h HandlerFunc, middleware ...MiddlewareFunc) HandlerFunc {
+	for i := len(middleware) - 1; i >= 0; i-- {
+		h = middleware[i](h)
+	}
+	return h
+}

vendor/github.com/labstack/echo/v4/go.mod

@@ -0,0 +1,11 @@
+module github.com/labstack/echo/v4
+
+go 1.12
+
+require (
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible
+	github.com/labstack/gommon v0.3.0
+	github.com/stretchr/testify v1.4.0
+	github.com/valyala/fasttemplate v1.0.1
+	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4
+)

vendor/github.com/labstack/echo/v4/go.sum

@@ -0,0 +1,34 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/labstack/gommon v0.3.0 h1:JEeO0bvc78PKdyHxloTKiF8BD5iGrH8T6MSeGvSgob0=
+github.com/labstack/gommon v0.3.0/go.mod h1:MULnywXg0yavhxWKc+lOruYdAhDwPK9wf0OL7NoOu+k=
+github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
+github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.9 h1:d5US/mDsogSGW37IV293h//ZFaeajb69h+EHFsv2xGg=
+github.com/mattn/go-isatty v0.0.9/go.mod h1:YNRxwqDuOph6SZLI9vUUz6OYw3QyUt7WiY2yME+cCiQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
+github.com/valyala/fasttemplate v1.0.1 h1:tY9CJiPnMXf1ERmG2EyK7gNUd+c6RKGD0IfU8WdUSz8=
+github.com/valyala/fasttemplate v1.0.1/go.mod h1:UQGH1tvbgY+Nz5t2n7tXsz52dQxojPUpymEIMZ47gx8=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
+golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

vendor/github.com/labstack/echo/v4/group.go

@@ -0,0 +1,124 @@
+package echo
+
+import (
+	"net/http"
+)
+
+type (
+	// Group is a set of sub-routes for a specified route. It can be used for inner
+	// routes that share a common middleware or functionality that should be separate
+	// from the parent echo instance while still inheriting from it.
+	Group struct {
+		common
+		host       string
+		prefix     string
+		middleware []MiddlewareFunc
+		echo       *Echo
+	}
+)
+
+// Use implements `Echo#Use()` for sub-routes within the Group.
+func (g *Group) Use(middleware ...MiddlewareFunc) {
+	g.middleware = append(g.middleware, middleware...)
+	if len(g.middleware) == 0 {
+		return
+	}
+	// Allow all requests to reach the group as they might get dropped if router
+	// doesn't find a match, making none of the group middleware process.
+	g.Any("", NotFoundHandler)
+	g.Any("/*", NotFoundHandler)
+}
+
+// CONNECT implements `Echo#CONNECT()` for sub-routes within the Group.
+func (g *Group) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodConnect, path, h, m...)
+}
+
+// DELETE implements `Echo#DELETE()` for sub-routes within the Group.
+func (g *Group) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodDelete, path, h, m...)
+}
+
+// GET implements `Echo#GET()` for sub-routes within the Group.
+func (g *Group) GET(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodGet, path, h, m...)
+}
+
+// HEAD implements `Echo#HEAD()` for sub-routes within the Group.
+func (g *Group) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodHead, path, h, m...)
+}
+
+// OPTIONS implements `Echo#OPTIONS()` for sub-routes within the Group.
+func (g *Group) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodOptions, path, h, m...)
+}
+
+// PATCH implements `Echo#PATCH()` for sub-routes within the Group.
+func (g *Group) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodPatch, path, h, m...)
+}
+
+// POST implements `Echo#POST()` for sub-routes within the Group.
+func (g *Group) POST(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodPost, path, h, m...)
+}
+
+// PUT implements `Echo#PUT()` for sub-routes within the Group.
+func (g *Group) PUT(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodPut, path, h, m...)
+}
+
+// TRACE implements `Echo#TRACE()` for sub-routes within the Group.
+func (g *Group) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
+	return g.Add(http.MethodTrace, path, h, m...)
+}
+
+// Any implements `Echo#Any()` for sub-routes within the Group.
+func (g *Group) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc) []*Route {
+	routes := make([]*Route, len(methods))
+	for i, m := range methods {
+		routes[i] = g.Add(m, path, handler, middleware...)
+	}
+	return routes
+}
+
+// Match implements `Echo#Match()` for sub-routes within the Group.
+func (g *Group) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc) []*Route {
+	routes := make([]*Route, len(methods))
+	for i, m := range methods {
+		routes[i] = g.Add(m, path, handler, middleware...)
+	}
+	return routes
+}
+
+// Group creates a new sub-group with prefix and optional sub-group-level middleware.
+func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) (sg *Group) {
+	m := make([]MiddlewareFunc, 0, len(g.middleware)+len(middleware))
+	m = append(m, g.middleware...)
+	m = append(m, middleware...)
+	sg = g.echo.Group(g.prefix+prefix, m...)
+	sg.host = g.host
+	return
+}
+
+// Static implements `Echo#Static()` for sub-routes within the Group.
+func (g *Group) Static(prefix, root string) {
+	g.static(prefix, root, g.GET)
+}
+
+// File implements `Echo#File()` for sub-routes within the Group.
+func (g *Group) File(path, file string) {
+	g.file(g.prefix+path, file, g.GET)
+}
+
+// Add implements `Echo#Add()` for sub-routes within the Group.
+func (g *Group) Add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
+	// Combine into a new slice to avoid accidentally passing the same slice for
+	// multiple routes, which would lead to later add() calls overwriting the
+	// middleware from earlier calls.
+	m := make([]MiddlewareFunc, 0, len(g.middleware)+len(middleware))
+	m = append(m, g.middleware...)
+	m = append(m, middleware...)
+	return g.echo.add(g.host, method, g.prefix+path, handler, m...)
+}

vendor/github.com/labstack/echo/v4/log.go

@@ -0,0 +1,41 @@
+package echo
+
+import (
+	"io"
+
+	"github.com/labstack/gommon/log"
+)
+
+type (
+	// Logger defines the logging interface.
+	Logger interface {
+		Output() io.Writer
+		SetOutput(w io.Writer)
+		Prefix() string
+		SetPrefix(p string)
+		Level() log.Lvl
+		SetLevel(v log.Lvl)
+		SetHeader(h string)
+		Print(i ...interface{})
+		Printf(format string, args ...interface{})
+		Printj(j log.JSON)
+		Debug(i ...interface{})
+		Debugf(format string, args ...interface{})
+		Debugj(j log.JSON)
+		Info(i ...interface{})
+		Infof(format string, args ...interface{})
+		Infoj(j log.JSON)
+		Warn(i ...interface{})
+		Warnf(format string, args ...interface{})
+		Warnj(j log.JSON)
+		Error(i ...interface{})
+		Errorf(format string, args ...interface{})
+		Errorj(j log.JSON)
+		Fatal(i ...interface{})
+		Fatalj(j log.JSON)
+		Fatalf(format string, args ...interface{})
+		Panic(i ...interface{})
+		Panicj(j log.JSON)
+		Panicf(format string, args ...interface{})
+	}
+)

vendor/github.com/labstack/echo/v4/response.go

@@ -0,0 +1,104 @@
+package echo
+
+import (
+	"bufio"
+	"net"
+	"net/http"
+)
+
+type (
+	// Response wraps an http.ResponseWriter and implements its interface to be used
+	// by an HTTP handler to construct an HTTP response.
+	// See: https://golang.org/pkg/net/http/#ResponseWriter
+	Response struct {
+		echo        *Echo
+		beforeFuncs []func()
+		afterFuncs  []func()
+		Writer      http.ResponseWriter
+		Status      int
+		Size        int64
+		Committed   bool
+	}
+)
+
+// NewResponse creates a new instance of Response.
+func NewResponse(w http.ResponseWriter, e *Echo) (r *Response) {
+	return &Response{Writer: w, echo: e}
+}
+
+// Header returns the header map for the writer that will be sent by
+// WriteHeader. Changing the header after a call to WriteHeader (or Write) has
+// no effect unless the modified headers were declared as trailers by setting
+// the "Trailer" header before the call to WriteHeader (see example)
+// To suppress implicit response headers, set their value to nil.
+// Example: https://golang.org/pkg/net/http/#example_ResponseWriter_trailers
+func (r *Response) Header() http.Header {
+	return r.Writer.Header()
+}
+
+// Before registers a function which is called just before the response is written.
+func (r *Response) Before(fn func()) {
+	r.beforeFuncs = append(r.beforeFuncs, fn)
+}
+
+// After registers a function which is called just after the response is written.
+// If the `Content-Length` is unknown, none of the after function is executed.
+func (r *Response) After(fn func()) {
+	r.afterFuncs = append(r.afterFuncs, fn)
+}
+
+// WriteHeader sends an HTTP response header with status code. If WriteHeader is
+// not called explicitly, the first call to Write will trigger an implicit
+// WriteHeader(http.StatusOK). Thus explicit calls to WriteHeader are mainly
+// used to send error codes.
+func (r *Response) WriteHeader(code int) {
+	if r.Committed {
+		r.echo.Logger.Warn("response already committed")
+		return
+	}
+	for _, fn := range r.beforeFuncs {
+		fn()
+	}
+	r.Status = code
+	r.Writer.WriteHeader(code)
+	r.Committed = true
+}
+
+// Write writes the data to the connection as part of an HTTP reply.
+func (r *Response) Write(b []byte) (n int, err error) {
+	if !r.Committed {
+		if r.Status == 0 {
+			r.Status = http.StatusOK
+		}
+		r.WriteHeader(r.Status)
+	}
+	n, err = r.Writer.Write(b)
+	r.Size += int64(n)
+	for _, fn := range r.afterFuncs {
+		fn()
+	}
+	return
+}
+
+// Flush implements the http.Flusher interface to allow an HTTP handler to flush
+// buffered data to the client.
+// See [http.Flusher](https://golang.org/pkg/net/http/#Flusher)
+func (r *Response) Flush() {
+	r.Writer.(http.Flusher).Flush()
+}
+
+// Hijack implements the http.Hijacker interface to allow an HTTP handler to
+// take over the connection.
+// See [http.Hijacker](https://golang.org/pkg/net/http/#Hijacker)
+func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	return r.Writer.(http.Hijacker).Hijack()
+}
+
+func (r *Response) reset(w http.ResponseWriter) {
+	r.beforeFuncs = nil
+	r.afterFuncs = nil
+	r.Writer = w
+	r.Size = 0
+	r.Status = http.StatusOK
+	r.Committed = false
+}

vendor/github.com/labstack/echo/v4/router.go

@@ -0,0 +1,443 @@
+package echo
+
+import "net/http"
+
+type (
+	// Router is the registry of all registered routes for an `Echo` instance for
+	// request matching and URL path parameter parsing.
+	Router struct {
+		tree   *node
+		routes map[string]*Route
+		echo   *Echo
+	}
+	node struct {
+		kind          kind
+		label         byte
+		prefix        string
+		parent        *node
+		children      children
+		ppath         string
+		pnames        []string
+		methodHandler *methodHandler
+	}
+	kind uint8
+	children []*node
+	methodHandler struct {
+		connect  HandlerFunc
+		delete   HandlerFunc
+		get      HandlerFunc
+		head     HandlerFunc
+		options  HandlerFunc
+		patch    HandlerFunc
+		post     HandlerFunc
+		propfind HandlerFunc
+		put      HandlerFunc
+		trace    HandlerFunc
+		report   HandlerFunc
+	}
+)
+
+const (
+	skind kind = iota
+	pkind
+	akind
+)
+
+// NewRouter returns a new Router instance.
+func NewRouter(e *Echo) *Router {
+	return &Router{
+		tree: &node{
+			methodHandler: new(methodHandler),
+		},
+		routes: map[string]*Route{},
+		echo:   e,
+	}
+}
+
+// Add registers a new route for method and path with matching handler.
+func (r *Router) Add(method, path string, h HandlerFunc) {
+	// Validate path
+	if path == "" {
+		path = "/"
+	}
+	if path[0] != '/' {
+		path = "/" + path
+	}
+	pnames := []string{} // Param names
+	ppath := path        // Pristine path
+
+	for i, l := 0, len(path); i < l; i++ {
+		if path[i] == ':' {
+			j := i + 1
+
+			r.insert(method, path[:i], nil, skind, "", nil)
+			for ; i < l && path[i] != '/'; i++ {
+			}
+
+			pnames = append(pnames, path[j:i])
+			path = path[:j] + path[i:]
+			i, l = j, len(path)
+
+			if i == l {
+				r.insert(method, path[:i], h, pkind, ppath, pnames)
+			} else {
+				r.insert(method, path[:i], nil, pkind, "", nil)
+			}
+		} else if path[i] == '*' {
+			r.insert(method, path[:i], nil, skind, "", nil)
+			pnames = append(pnames, "*")
+			r.insert(method, path[:i+1], h, akind, ppath, pnames)
+		}
+	}
+
+	r.insert(method, path, h, skind, ppath, pnames)
+}
+
+func (r *Router) insert(method, path string, h HandlerFunc, t kind, ppath string, pnames []string) {
+	// Adjust max param
+	l := len(pnames)
+	if *r.echo.maxParam < l {
+		*r.echo.maxParam = l
+	}
+
+	cn := r.tree // Current node as root
+	if cn == nil {
+		panic("echo: invalid method")
+	}
+	search := path
+
+	for {
+		sl := len(search)
+		pl := len(cn.prefix)
+		l := 0
+
+		// LCP
+		max := pl
+		if sl < max {
+			max = sl
+		}
+		for ; l < max && search[l] == cn.prefix[l]; l++ {
+		}
+
+		if l == 0 {
+			// At root node
+			cn.label = search[0]
+			cn.prefix = search
+			if h != nil {
+				cn.kind = t
+				cn.addHandler(method, h)
+				cn.ppath = ppath
+				cn.pnames = pnames
+			}
+		} else if l < pl {
+			// Split node
+			n := newNode(cn.kind, cn.prefix[l:], cn, cn.children, cn.methodHandler, cn.ppath, cn.pnames)
+
+			// Reset parent node
+			cn.kind = skind
+			cn.label = cn.prefix[0]
+			cn.prefix = cn.prefix[:l]
+			cn.children = nil
+			cn.methodHandler = new(methodHandler)
+			cn.ppath = ""
+			cn.pnames = nil
+
+			cn.addChild(n)
+
+			if l == sl {
+				// At parent node
+				cn.kind = t
+				cn.addHandler(method, h)
+				cn.ppath = ppath
+				cn.pnames = pnames
+			} else {
+				// Create child node
+				n = newNode(t, search[l:], cn, nil, new(methodHandler), ppath, pnames)
+				n.addHandler(method, h)
+				cn.addChild(n)
+			}
+		} else if l < sl {
+			search = search[l:]
+			c := cn.findChildWithLabel(search[0])
+			if c != nil {
+				// Go deeper
+				cn = c
+				continue
+			}
+			// Create child node
+			n := newNode(t, search, cn, nil, new(methodHandler), ppath, pnames)
+			n.addHandler(method, h)
+			cn.addChild(n)
+		} else {
+			// Node already exists
+			if h != nil {
+				cn.addHandler(method, h)
+				cn.ppath = ppath
+				if len(cn.pnames) == 0 { // Issue #729
+					cn.pnames = pnames
+				}
+			}
+		}
+		return
+	}
+}
+
+func newNode(t kind, pre string, p *node, c children, mh *methodHandler, ppath string, pnames []string) *node {
+	return &node{
+		kind:          t,
+		label:         pre[0],
+		prefix:        pre,
+		parent:        p,
+		children:      c,
+		ppath:         ppath,
+		pnames:        pnames,
+		methodHandler: mh,
+	}
+}
+
+func (n *node) addChild(c *node) {
+	n.children = append(n.children, c)
+}
+
+func (n *node) findChild(l byte, t kind) *node {
+	for _, c := range n.children {
+		if c.label == l && c.kind == t {
+			return c
+		}
+	}
+	return nil
+}
+
+func (n *node) findChildWithLabel(l byte) *node {
+	for _, c := range n.children {
+		if c.label == l {
+			return c
+		}
+	}
+	return nil
+}
+
+func (n *node) findChildByKind(t kind) *node {
+	for _, c := range n.children {
+		if c.kind == t {
+			return c
+		}
+	}
+	return nil
+}
+
+func (n *node) addHandler(method string, h HandlerFunc) {
+	switch method {
+	case http.MethodConnect:
+		n.methodHandler.connect = h
+	case http.MethodDelete:
+		n.methodHandler.delete = h
+	case http.MethodGet:
+		n.methodHandler.get = h
+	case http.MethodHead:
+		n.methodHandler.head = h
+	case http.MethodOptions:
+		n.methodHandler.options = h
+	case http.MethodPatch:
+		n.methodHandler.patch = h
+	case http.MethodPost:
+		n.methodHandler.post = h
+	case PROPFIND:
+		n.methodHandler.propfind = h
+	case http.MethodPut:
+		n.methodHandler.put = h
+	case http.MethodTrace:
+		n.methodHandler.trace = h
+	case REPORT:
+		n.methodHandler.report = h
+	}
+}
+
+func (n *node) findHandler(method string) HandlerFunc {
+	switch method {
+	case http.MethodConnect:
+		return n.methodHandler.connect
+	case http.MethodDelete:
+		return n.methodHandler.delete
+	case http.MethodGet:
+		return n.methodHandler.get
+	case http.MethodHead:
+		return n.methodHandler.head
+	case http.MethodOptions:
+		return n.methodHandler.options
+	case http.MethodPatch:
+		return n.methodHandler.patch
+	case http.MethodPost:
+		return n.methodHandler.post
+	case PROPFIND:
+		return n.methodHandler.propfind
+	case http.MethodPut:
+		return n.methodHandler.put
+	case http.MethodTrace:
+		return n.methodHandler.trace
+	case REPORT:
+		return n.methodHandler.report
+	default:
+		return nil
+	}
+}
+
+func (n *node) checkMethodNotAllowed() HandlerFunc {
+	for _, m := range methods {
+		if h := n.findHandler(m); h != nil {
+			return MethodNotAllowedHandler
+		}
+	}
+	return NotFoundHandler
+}
+
+// Find lookup a handler registered for method and path. It also parses URL for path
+// parameters and load them into context.
+//
+// For performance:
+//
+// - Get context from `Echo#AcquireContext()`
+// - Reset it `Context#Reset()`
+// - Return it `Echo#ReleaseContext()`.
+func (r *Router) Find(method, path string, c Context) {
+	ctx := c.(*context)
+	ctx.path = path
+	cn := r.tree // Current node as root
+
+	var (
+		search  = path
+		child   *node         // Child node
+		n       int           // Param counter
+		nk      kind          // Next kind
+		nn      *node         // Next node
+		ns      string        // Next search
+		pvalues = ctx.pvalues // Use the internal slice so the interface can keep the illusion of a dynamic slice
+	)
+
+	// Search order static > param > any
+	for {
+		if search == "" {
+			break
+		}
+
+		pl := 0 // Prefix length
+		l := 0  // LCP length
+
+		if cn.label != ':' {
+			sl := len(search)
+			pl = len(cn.prefix)
+
+			// LCP
+			max := pl
+			if sl < max {
+				max = sl
+			}
+			for ; l < max && search[l] == cn.prefix[l]; l++ {
+			}
+		}
+
+
+		if l == pl {
+			// Continue search
+			search = search[l:]
+		} else {
+			if nn == nil { // Issue #1348
+				return // Not found
+			}
+			cn = nn
+			search = ns
+			if nk == pkind {
+				goto Param
+			} else if nk == akind {
+				goto Any
+			}
+		}
+
+		if search == "" {
+			break
+		}
+
+		// Static node
+		if child = cn.findChild(search[0], skind); child != nil {
+			// Save next
+			if cn.prefix[len(cn.prefix)-1] == '/' { // Issue #623
+				nk = pkind
+				nn = cn
+				ns = search
+			}
+			cn = child
+			continue
+		}
+
+		// Param node
+	Param:
+		if child = cn.findChildByKind(pkind); child != nil {
+			// Issue #378
+			if len(pvalues) == n {
+				continue
+			}
+
+			// Save next
+			if cn.prefix[len(cn.prefix)-1] == '/' { // Issue #623
+				nk = akind
+				nn = cn
+				ns = search
+			}
+
+			cn = child
+			i, l := 0, len(search)
+			for ; i < l && search[i] != '/'; i++ {
+			}
+			pvalues[n] = search[:i]
+			n++
+			search = search[i:]
+			continue
+		}
+
+		// Any node
+	Any:
+		if cn = cn.findChildByKind(akind); cn == nil {
+			if nn != nil {
+				cn = nn
+				nn = cn.parent // Next (Issue #954)
+				if nn != nil {
+					nk = nn.kind
+				}
+				search = ns
+				if nk == pkind {
+					goto Param
+				} else if nk == akind {
+					goto Any
+				}
+			}
+			return // Not found
+		}
+		pvalues[len(cn.pnames)-1] = search
+		break
+	}
+
+	ctx.handler = cn.findHandler(method)
+	ctx.path = cn.ppath
+	ctx.pnames = cn.pnames
+
+	// NOTE: Slow zone...
+	if ctx.handler == nil {
+		ctx.handler = cn.checkMethodNotAllowed()
+
+		// Dig further for any, might have an empty value for *, e.g.
+		// serving a directory. Issue #207.
+		if cn = cn.findChildByKind(akind); cn == nil {
+			return
+		}
+		if h := cn.findHandler(method); h != nil {
+			ctx.handler = h
+		} else {
+			ctx.handler = cn.checkMethodNotAllowed()
+		}
+		ctx.path = cn.ppath
+		ctx.pnames = cn.pnames
+		pvalues[len(cn.pnames)-1] = ""
+	}
+
+	return
+}

vendor/github.com/labstack/gommon/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 labstack
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

vendor/github.com/labstack/gommon/color/README.md

@@ -0,0 +1,86 @@
+# Color
+
+Style terminal text.
+
+## Installation
+
+```sh
+go get github.com/labstack/gommon/color
+```
+
+## Windows?
+
+Try [cmder](http://bliker.github.io/cmder) or https://github.com/mattn/go-colorable
+
+## [Usage](https://github.com/labstack/gommon/blob/master/color/color_test.go)
+
+```sh
+import github.com/labstack/gommon/color
+```
+
+### Colored text
+
+```go
+color.Println(color.Black("black"))
+color.Println(color.Red("red"))
+color.Println(color.Green("green"))
+color.Println(color.Yellow("yellow"))
+color.Println(color.Blue("blue"))
+color.Println(color.Magenta("magenta"))
+color.Println(color.Cyan("cyan"))
+color.Println(color.White("white"))
+color.Println(color.Grey("grey"))
+```
+![Colored Text](http://i.imgur.com/8RtY1QR.png)
+
+### Colored background
+
+```go
+color.Println(color.BlackBg("black background", color.Wht))
+color.Println(color.RedBg("red background"))
+color.Println(color.GreenBg("green background"))
+color.Println(color.YellowBg("yellow background"))
+color.Println(color.BlueBg("blue background"))
+color.Println(color.MagentaBg("magenta background"))
+color.Println(color.CyanBg("cyan background"))
+color.Println(color.WhiteBg("white background"))
+```
+![Colored Background](http://i.imgur.com/SrrS6lw.png)
+
+### Emphasis
+
+```go
+color.Println(color.Bold("bold"))
+color.Println(color.Dim("dim"))
+color.Println(color.Italic("italic"))
+color.Println(color.Underline("underline"))
+color.Println(color.Inverse("inverse"))
+color.Println(color.Hidden("hidden"))
+color.Println(color.Strikeout("strikeout"))
+```
+![Emphasis](http://i.imgur.com/3RSJBbc.png)
+
+### Mix and match
+
+```go
+color.Println(color.Green("bold green with white background", color.B, color.WhtBg))
+color.Println(color.Red("underline red", color.U))
+color.Println(color.Yellow("dim yellow", color.D))
+color.Println(color.Cyan("inverse cyan", color.In))
+color.Println(color.Blue("bold underline dim blue", color.B, color.U, color.D))
+```
+![Mix and match](http://i.imgur.com/jWGq9Ca.png)
+
+### Enable/Disable the package
+
+```go
+color.Disable()
+color.Enable()
+```
+
+### New instance
+
+```go
+c := New()
+c.Green("green")
+```

vendor/github.com/labstack/gommon/color/color.go

@@ -0,0 +1,407 @@
+package color
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/mattn/go-colorable"
+	"github.com/mattn/go-isatty"
+)
+
+type (
+	inner func(interface{}, []string, *Color) string
+)
+
+// Color styles
+const (
+	// Blk Black text style
+	Blk = "30"
+	// Rd red text style
+	Rd = "31"
+	// Grn green text style
+	Grn = "32"
+	// Yel yellow text style
+	Yel = "33"
+	// Blu blue text style
+	Blu = "34"
+	// Mgn magenta text style
+	Mgn = "35"
+	// Cyn cyan text style
+	Cyn = "36"
+	// Wht white text style
+	Wht = "37"
+	// Gry grey text style
+	Gry = "90"
+
+	// BlkBg black background style
+	BlkBg = "40"
+	// RdBg red background style
+	RdBg = "41"
+	// GrnBg green background style
+	GrnBg = "42"
+	// YelBg yellow background style
+	YelBg = "43"
+	// BluBg blue background style
+	BluBg = "44"
+	// MgnBg magenta background style
+	MgnBg = "45"
+	// CynBg cyan background style
+	CynBg = "46"
+	// WhtBg white background style
+	WhtBg = "47"
+
+	// R reset emphasis style
+	R = "0"
+	// B bold emphasis style
+	B = "1"
+	// D dim emphasis style
+	D = "2"
+	// I italic emphasis style
+	I = "3"
+	// U underline emphasis style
+	U = "4"
+	// In inverse emphasis style
+	In = "7"
+	// H hidden emphasis style
+	H = "8"
+	// S strikeout emphasis style
+	S = "9"
+)
+
+var (
+	black   = outer(Blk)
+	red     = outer(Rd)
+	green   = outer(Grn)
+	yellow  = outer(Yel)
+	blue    = outer(Blu)
+	magenta = outer(Mgn)
+	cyan    = outer(Cyn)
+	white   = outer(Wht)
+	grey    = outer(Gry)
+
+	blackBg   = outer(BlkBg)
+	redBg     = outer(RdBg)
+	greenBg   = outer(GrnBg)
+	yellowBg  = outer(YelBg)
+	blueBg    = outer(BluBg)
+	magentaBg = outer(MgnBg)
+	cyanBg    = outer(CynBg)
+	whiteBg   = outer(WhtBg)
+
+	reset     = outer(R)
+	bold      = outer(B)
+	dim       = outer(D)
+	italic    = outer(I)
+	underline = outer(U)
+	inverse   = outer(In)
+	hidden    = outer(H)
+	strikeout = outer(S)
+
+	global = New()
+)
+
+func outer(n string) inner {
+	return func(msg interface{}, styles []string, c *Color) string {
+		// TODO: Drop fmt to boost performance?
+		if c.disabled {
+			return fmt.Sprintf("%v", msg)
+		}
+
+		b := new(bytes.Buffer)
+		b.WriteString("\x1b[")
+		b.WriteString(n)
+		for _, s := range styles {
+			b.WriteString(";")
+			b.WriteString(s)
+		}
+		b.WriteString("m")
+		return fmt.Sprintf("%s%v\x1b[0m", b.String(), msg)
+	}
+}
+
+type (
+	Color struct {
+		output   io.Writer
+		disabled bool
+	}
+)
+
+// New creates a Color instance.
+func New() (c *Color) {
+	c = new(Color)
+	c.SetOutput(colorable.NewColorableStdout())
+	return
+}
+
+// Output returns the output.
+func (c *Color) Output() io.Writer {
+	return c.output
+}
+
+// SetOutput sets the output.
+func (c *Color) SetOutput(w io.Writer) {
+	c.output = w
+	if w, ok := w.(*os.File); !ok || !isatty.IsTerminal(w.Fd()) {
+		c.disabled = true
+	}
+}
+
+// Disable disables the colors and styles.
+func (c *Color) Disable() {
+	c.disabled = true
+}
+
+// Enable enables the colors and styles.
+func (c *Color) Enable() {
+	c.disabled = false
+}
+
+// Print is analogous to `fmt.Print` with termial detection.
+func (c *Color) Print(args ...interface{}) {
+	fmt.Fprint(c.output, args...)
+}
+
+// Println is analogous to `fmt.Println` with termial detection.
+func (c *Color) Println(args ...interface{}) {
+	fmt.Fprintln(c.output, args...)
+}
+
+// Printf is analogous to `fmt.Printf` with termial detection.
+func (c *Color) Printf(format string, args ...interface{}) {
+	fmt.Fprintf(c.output, format, args...)
+}
+
+func (c *Color) Black(msg interface{}, styles ...string) string {
+	return black(msg, styles, c)
+}
+
+func (c *Color) Red(msg interface{}, styles ...string) string {
+	return red(msg, styles, c)
+}
+
+func (c *Color) Green(msg interface{}, styles ...string) string {
+	return green(msg, styles, c)
+}
+
+func (c *Color) Yellow(msg interface{}, styles ...string) string {
+	return yellow(msg, styles, c)
+}
+
+func (c *Color) Blue(msg interface{}, styles ...string) string {
+	return blue(msg, styles, c)
+}
+
+func (c *Color) Magenta(msg interface{}, styles ...string) string {
+	return magenta(msg, styles, c)
+}
+
+func (c *Color) Cyan(msg interface{}, styles ...string) string {
+	return cyan(msg, styles, c)
+}
+
+func (c *Color) White(msg interface{}, styles ...string) string {
+	return white(msg, styles, c)
+}
+
+func (c *Color) Grey(msg interface{}, styles ...string) string {
+	return grey(msg, styles, c)
+}
+
+func (c *Color) BlackBg(msg interface{}, styles ...string) string {
+	return blackBg(msg, styles, c)
+}
+
+func (c *Color) RedBg(msg interface{}, styles ...string) string {
+	return redBg(msg, styles, c)
+}
+
+func (c *Color) GreenBg(msg interface{}, styles ...string) string {
+	return greenBg(msg, styles, c)
+}
+
+func (c *Color) YellowBg(msg interface{}, styles ...string) string {
+	return yellowBg(msg, styles, c)
+}
+
+func (c *Color) BlueBg(msg interface{}, styles ...string) string {
+	return blueBg(msg, styles, c)
+}
+
+func (c *Color) MagentaBg(msg interface{}, styles ...string) string {
+	return magentaBg(msg, styles, c)
+}
+
+func (c *Color) CyanBg(msg interface{}, styles ...string) string {
+	return cyanBg(msg, styles, c)
+}
+
+func (c *Color) WhiteBg(msg interface{}, styles ...string) string {
+	return whiteBg(msg, styles, c)
+}
+
+func (c *Color) Reset(msg interface{}, styles ...string) string {
+	return reset(msg, styles, c)
+}
+
+func (c *Color) Bold(msg interface{}, styles ...string) string {
+	return bold(msg, styles, c)
+}
+
+func (c *Color) Dim(msg interface{}, styles ...string) string {
+	return dim(msg, styles, c)
+}
+
+func (c *Color) Italic(msg interface{}, styles ...string) string {
+	return italic(msg, styles, c)
+}
+
+func (c *Color) Underline(msg interface{}, styles ...string) string {
+	return underline(msg, styles, c)
+}
+
+func (c *Color) Inverse(msg interface{}, styles ...string) string {
+	return inverse(msg, styles, c)
+}
+
+func (c *Color) Hidden(msg interface{}, styles ...string) string {
+	return hidden(msg, styles, c)
+}
+
+func (c *Color) Strikeout(msg interface{}, styles ...string) string {
+	return strikeout(msg, styles, c)
+}
+
+// Output returns the output.
+func Output() io.Writer {
+	return global.output
+}
+
+// SetOutput sets the output.
+func SetOutput(w io.Writer) {
+	global.SetOutput(w)
+}
+
+func Disable() {
+	global.Disable()
+}
+
+func Enable() {
+	global.Enable()
+}
+
+// Print is analogous to `fmt.Print` with termial detection.
+func Print(args ...interface{}) {
+	global.Print(args...)
+}
+
+// Println is analogous to `fmt.Println` with termial detection.
+func Println(args ...interface{}) {
+	global.Println(args...)
+}
+
+// Printf is analogous to `fmt.Printf` with termial detection.
+func Printf(format string, args ...interface{}) {
+	global.Printf(format, args...)
+}
+
+func Black(msg interface{}, styles ...string) string {
+	return global.Black(msg, styles...)
+}
+
+func Red(msg interface{}, styles ...string) string {
+	return global.Red(msg, styles...)
+}
+
+func Green(msg interface{}, styles ...string) string {
+	return global.Green(msg, styles...)
+}
+
+func Yellow(msg interface{}, styles ...string) string {
+	return global.Yellow(msg, styles...)
+}
+
+func Blue(msg interface{}, styles ...string) string {
+	return global.Blue(msg, styles...)
+}
+
+func Magenta(msg interface{}, styles ...string) string {
+	return global.Magenta(msg, styles...)
+}
+
+func Cyan(msg interface{}, styles ...string) string {
+	return global.Cyan(msg, styles...)
+}
+
+func White(msg interface{}, styles ...string) string {
+	return global.White(msg, styles...)
+}
+
+func Grey(msg interface{}, styles ...string) string {
+	return global.Grey(msg, styles...)
+}
+
+func BlackBg(msg interface{}, styles ...string) string {
+	return global.BlackBg(msg, styles...)
+}
+
+func RedBg(msg interface{}, styles ...string) string {
+	return global.RedBg(msg, styles...)
+}
+
+func GreenBg(msg interface{}, styles ...string) string {
+	return global.GreenBg(msg, styles...)
+}
+
+func YellowBg(msg interface{}, styles ...string) string {
+	return global.YellowBg(msg, styles...)
+}
+
+func BlueBg(msg interface{}, styles ...string) string {
+	return global.BlueBg(msg, styles...)
+}
+
+func MagentaBg(msg interface{}, styles ...string) string {
+	return global.MagentaBg(msg, styles...)
+}
+
+func CyanBg(msg interface{}, styles ...string) string {
+	return global.CyanBg(msg, styles...)
+}
+
+func WhiteBg(msg interface{}, styles ...string) string {
+	return global.WhiteBg(msg, styles...)
+}
+
+func Reset(msg interface{}, styles ...string) string {
+	return global.Reset(msg, styles...)
+}
+
+func Bold(msg interface{}, styles ...string) string {
+	return global.Bold(msg, styles...)
+}
+
+func Dim(msg interface{}, styles ...string) string {
+	return global.Dim(msg, styles...)
+}
+
+func Italic(msg interface{}, styles ...string) string {
+	return global.Italic(msg, styles...)
+}
+
+func Underline(msg interface{}, styles ...string) string {
+	return global.Underline(msg, styles...)
+}
+
+func Inverse(msg interface{}, styles ...string) string {
+	return global.Inverse(msg, styles...)
+}
+
+func Hidden(msg interface{}, styles ...string) string {
+	return global.Hidden(msg, styles...)
+}
+
+func Strikeout(msg interface{}, styles ...string) string {
+	return global.Strikeout(msg, styles...)
+}

vendor/github.com/labstack/gommon/log/README.md

@@ -0,0 +1,5 @@
+## WORK IN PROGRESS
+
+### Usage
+
+[log_test.go](log_test.go)

vendor/github.com/labstack/gommon/log/color.go

@@ -0,0 +1,13 @@
+// +build !appengine
+
+package log
+
+import (
+	"io"
+
+	"github.com/mattn/go-colorable"
+)
+
+func output() io.Writer {
+	return colorable.NewColorableStdout()
+}

vendor/github.com/labstack/gommon/log/log.go

@@ -0,0 +1,416 @@
+package log
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"runtime"
+	"strconv"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/mattn/go-isatty"
+	"github.com/valyala/fasttemplate"
+
+	"github.com/labstack/gommon/color"
+)
+
+type (
+	Logger struct {
+		prefix     string
+		level      uint32
+		skip       int
+		output     io.Writer
+		template   *fasttemplate.Template
+		levels     []string
+		color      *color.Color
+		bufferPool sync.Pool
+		mutex      sync.Mutex
+	}
+
+	Lvl uint8
+
+	JSON map[string]interface{}
+)
+
+const (
+	DEBUG Lvl = iota + 1
+	INFO
+	WARN
+	ERROR
+	OFF
+	panicLevel
+	fatalLevel
+)
+
+var (
+	global        = New("-")
+	defaultHeader = `{"time":"${time_rfc3339_nano}","level":"${level}","prefix":"${prefix}",` +
+		`"file":"${short_file}","line":"${line}"}`
+)
+
+func init() {
+	global.skip = 3
+}
+
+func New(prefix string) (l *Logger) {
+	l = &Logger{
+		level:    uint32(INFO),
+		skip:     2,
+		prefix:   prefix,
+		template: l.newTemplate(defaultHeader),
+		color:    color.New(),
+		bufferPool: sync.Pool{
+			New: func() interface{} {
+				return bytes.NewBuffer(make([]byte, 256))
+			},
+		},
+	}
+	l.initLevels()
+	l.SetOutput(output())
+	return
+}
+
+func (l *Logger) initLevels() {
+	l.levels = []string{
+		"-",
+		l.color.Blue("DEBUG"),
+		l.color.Green("INFO"),
+		l.color.Yellow("WARN"),
+		l.color.Red("ERROR"),
+		"",
+		l.color.Yellow("PANIC", color.U),
+		l.color.Red("FATAL", color.U),
+	}
+}
+
+func (l *Logger) newTemplate(format string) *fasttemplate.Template {
+	return fasttemplate.New(format, "${", "}")
+}
+
+func (l *Logger) DisableColor() {
+	l.color.Disable()
+	l.initLevels()
+}
+
+func (l *Logger) EnableColor() {
+	l.color.Enable()
+	l.initLevels()
+}
+
+func (l *Logger) Prefix() string {
+	return l.prefix
+}
+
+func (l *Logger) SetPrefix(p string) {
+	l.prefix = p
+}
+
+func (l *Logger) Level() Lvl {
+	return Lvl(atomic.LoadUint32(&l.level))
+}
+
+func (l *Logger) SetLevel(level Lvl) {
+	atomic.StoreUint32(&l.level, uint32(level))
+}
+
+func (l *Logger) Output() io.Writer {
+	return l.output
+}
+
+func (l *Logger) SetOutput(w io.Writer) {
+	l.output = w
+	if w, ok := w.(*os.File); !ok || !isatty.IsTerminal(w.Fd()) {
+		l.DisableColor()
+	}
+}
+
+func (l *Logger) Color() *color.Color {
+	return l.color
+}
+
+func (l *Logger) SetHeader(h string) {
+	l.template = l.newTemplate(h)
+}
+
+func (l *Logger) Print(i ...interface{}) {
+	l.log(0, "", i...)
+	// fmt.Fprintln(l.output, i...)
+}
+
+func (l *Logger) Printf(format string, args ...interface{}) {
+	l.log(0, format, args...)
+}
+
+func (l *Logger) Printj(j JSON) {
+	l.log(0, "json", j)
+}
+
+func (l *Logger) Debug(i ...interface{}) {
+	l.log(DEBUG, "", i...)
+}
+
+func (l *Logger) Debugf(format string, args ...interface{}) {
+	l.log(DEBUG, format, args...)
+}
+
+func (l *Logger) Debugj(j JSON) {
+	l.log(DEBUG, "json", j)
+}
+
+func (l *Logger) Info(i ...interface{}) {
+	l.log(INFO, "", i...)
+}
+
+func (l *Logger) Infof(format string, args ...interface{}) {
+	l.log(INFO, format, args...)
+}
+
+func (l *Logger) Infoj(j JSON) {
+	l.log(INFO, "json", j)
+}
+
+func (l *Logger) Warn(i ...interface{}) {
+	l.log(WARN, "", i...)
+}
+
+func (l *Logger) Warnf(format string, args ...interface{}) {
+	l.log(WARN, format, args...)
+}
+
+func (l *Logger) Warnj(j JSON) {
+	l.log(WARN, "json", j)
+}
+
+func (l *Logger) Error(i ...interface{}) {
+	l.log(ERROR, "", i...)
+}
+
+func (l *Logger) Errorf(format string, args ...interface{}) {
+	l.log(ERROR, format, args...)
+}
+
+func (l *Logger) Errorj(j JSON) {
+	l.log(ERROR, "json", j)
+}
+
+func (l *Logger) Fatal(i ...interface{}) {
+	l.log(fatalLevel, "", i...)
+	os.Exit(1)
+}
+
+func (l *Logger) Fatalf(format string, args ...interface{}) {
+	l.log(fatalLevel, format, args...)
+	os.Exit(1)
+}
+
+func (l *Logger) Fatalj(j JSON) {
+	l.log(fatalLevel, "json", j)
+	os.Exit(1)
+}
+
+func (l *Logger) Panic(i ...interface{}) {
+	l.log(panicLevel, "", i...)
+	panic(fmt.Sprint(i...))
+}
+
+func (l *Logger) Panicf(format string, args ...interface{}) {
+	l.log(panicLevel, format, args...)
+	panic(fmt.Sprintf(format, args...))
+}
+
+func (l *Logger) Panicj(j JSON) {
+	l.log(panicLevel, "json", j)
+	panic(j)
+}
+
+func DisableColor() {
+	global.DisableColor()
+}
+
+func EnableColor() {
+	global.EnableColor()
+}
+
+func Prefix() string {
+	return global.Prefix()
+}
+
+func SetPrefix(p string) {
+	global.SetPrefix(p)
+}
+
+func Level() Lvl {
+	return global.Level()
+}
+
+func SetLevel(level Lvl) {
+	global.SetLevel(level)
+}
+
+func Output() io.Writer {
+	return global.Output()
+}
+
+func SetOutput(w io.Writer) {
+	global.SetOutput(w)
+}
+
+func SetHeader(h string) {
+	global.SetHeader(h)
+}
+
+func Print(i ...interface{}) {
+	global.Print(i...)
+}
+
+func Printf(format string, args ...interface{}) {
+	global.Printf(format, args...)
+}
+
+func Printj(j JSON) {
+	global.Printj(j)
+}
+
+func Debug(i ...interface{}) {
+	global.Debug(i...)
+}
+
+func Debugf(format string, args ...interface{}) {
+	global.Debugf(format, args...)
+}
+
+func Debugj(j JSON) {
+	global.Debugj(j)
+}
+
+func Info(i ...interface{}) {
+	global.Info(i...)
+}
+
+func Infof(format string, args ...interface{}) {
+	global.Infof(format, args...)
+}
+
+func Infoj(j JSON) {
+	global.Infoj(j)
+}
+
+func Warn(i ...interface{}) {
+	global.Warn(i...)
+}
+
+func Warnf(format string, args ...interface{}) {
+	global.Warnf(format, args...)
+}
+
+func Warnj(j JSON) {
+	global.Warnj(j)
+}
+
+func Error(i ...interface{}) {
+	global.Error(i...)
+}
+
+func Errorf(format string, args ...interface{}) {
+	global.Errorf(format, args...)
+}
+
+func Errorj(j JSON) {
+	global.Errorj(j)
+}
+
+func Fatal(i ...interface{}) {
+	global.Fatal(i...)
+}
+
+func Fatalf(format string, args ...interface{}) {
+	global.Fatalf(format, args...)
+}
+
+func Fatalj(j JSON) {
+	global.Fatalj(j)
+}
+
+func Panic(i ...interface{}) {
+	global.Panic(i...)
+}
+
+func Panicf(format string, args ...interface{}) {
+	global.Panicf(format, args...)
+}
+
+func Panicj(j JSON) {
+	global.Panicj(j)
+}
+
+func (l *Logger) log(level Lvl, format string, args ...interface{}) {
+	if level >= l.Level() || level == 0 {
+		buf := l.bufferPool.Get().(*bytes.Buffer)
+		buf.Reset()
+		defer l.bufferPool.Put(buf)
+		_, file, line, _ := runtime.Caller(l.skip)
+		message := ""
+
+		if format == "" {
+			message = fmt.Sprint(args...)
+		} else if format == "json" {
+			b, err := json.Marshal(args[0])
+			if err != nil {
+				panic(err)
+			}
+			message = string(b)
+		} else {
+			message = fmt.Sprintf(format, args...)
+		}
+
+		_, err := l.template.ExecuteFunc(buf, func(w io.Writer, tag string) (int, error) {
+			switch tag {
+			case "time_rfc3339":
+				return w.Write([]byte(time.Now().Format(time.RFC3339)))
+			case "time_rfc3339_nano":
+				return w.Write([]byte(time.Now().Format(time.RFC3339Nano)))
+			case "level":
+				return w.Write([]byte(l.levels[level]))
+			case "prefix":
+				return w.Write([]byte(l.prefix))
+			case "long_file":
+				return w.Write([]byte(file))
+			case "short_file":
+				return w.Write([]byte(path.Base(file)))
+			case "line":
+				return w.Write([]byte(strconv.Itoa(line)))
+			}
+			return 0, nil
+		})
+
+		if err == nil {
+			s := buf.String()
+			i := buf.Len() - 1
+			if s[i] == '}' {
+				// JSON header
+				buf.Truncate(i)
+				buf.WriteByte(',')
+				if format == "json" {
+					buf.WriteString(message[1:])
+				} else {
+					buf.WriteString(`"message":`)
+					buf.WriteString(strconv.Quote(message))
+					buf.WriteString(`}`)
+				}
+			} else {
+				// Text header
+				buf.WriteByte(' ')
+				buf.WriteString(message)
+			}
+			buf.WriteByte('\n')
+			l.mutex.Lock()
+			defer l.mutex.Unlock()
+			l.output.Write(buf.Bytes())
+		}
+	}
+}

vendor/github.com/labstack/gommon/log/white.go

@@ -0,0 +1,12 @@
+// +build appengine
+
+package log
+
+import (
+	"io"
+	"os"
+)
+
+func output() io.Writer {
+	return os.Stdout
+}