80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
// Copyright 2019 DeepMap, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package codegen
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"encoding/base64"
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"fmt"
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"text/template"
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"github.com/getkin/kin-openapi/openapi3"
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)
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// This generates a gzipped, base64 encoded JSON representation of the
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// swagger definition, which we embed inside the generated code.
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func GenerateInlinedSpec(t *template.Template, importMapping importMap, swagger *openapi3.T) (string, error) {
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// Marshal to json
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encoded, err := swagger.MarshalJSON()
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if err != nil {
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return "", fmt.Errorf("error marshaling swagger: %s", err)
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}
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// gzip
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var buf bytes.Buffer
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zw, err := gzip.NewWriterLevel(&buf, gzip.BestCompression)
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if err != nil {
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return "", fmt.Errorf("error creating gzip compressor: %s", err)
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}
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_, err = zw.Write(encoded)
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if err != nil {
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return "", fmt.Errorf("error gzipping swagger file: %s", err)
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}
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err = zw.Close()
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if err != nil {
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return "", fmt.Errorf("error gzipping swagger file: %s", err)
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}
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str := base64.StdEncoding.EncodeToString(buf.Bytes())
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var parts []string
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const width = 80
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// Chop up the string into an array of strings.
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for len(str) > width {
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part := str[0:width]
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parts = append(parts, part)
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str = str[width:]
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}
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if len(str) > 0 {
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parts = append(parts, str)
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}
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// Generate inline code.
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buf.Reset()
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w := bufio.NewWriter(&buf)
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err = t.ExecuteTemplate(w, "inline.tmpl", struct {
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SpecParts []string
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ImportMapping importMap
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}{SpecParts: parts, ImportMapping: importMapping})
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if err != nil {
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return "", fmt.Errorf("error generating inlined spec: %s", err)
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}
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err = w.Flush()
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if err != nil {
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return "", fmt.Errorf("error flushing output buffer for inlined spec: %s", err)
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}
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return buf.String(), nil
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}
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