api: improve parity of /{modules,projects}/{list,info} routes

These endpoint are similar in many ways, therefore just one commit. Their
functionality is basically same as in lorax except for error messages and
weird edge cases when handling trailing slashes.

closes #64, closes #65

internal/mocks/rpmmd/fixtures.go

@@ -1,14 +1,47 @@
 package rpmmd_mock
 
 import (
+	"fmt"
 	"github.com/osbuild/osbuild-composer/internal/rpmmd"
+	"time"
 )
 
+func generatePackageList() rpmmd.PackageList {
+	baseTime, err := time.Parse(time.RFC3339, "2006-01-02T15:04:05Z")
+
+	if err != nil {
+		panic(err)
+	}
+
+	var packageList rpmmd.PackageList
+
+	for i := 0; i < 22; i++ {
+		basePackage := rpmmd.Package{
+			Name:        fmt.Sprintf("package%d", i),
+			Summary:     fmt.Sprintf("pkg%d sum", i),
+			Description: fmt.Sprintf("pkg%d desc", i),
+			URL:         fmt.Sprintf("https://pkg%d.example.com", i),
+			Epoch:       0,
+			Version:     fmt.Sprintf("%d.0", i),
+			Release:     fmt.Sprintf("%d.fc30", i),
+			Arch:        "x86_64",
+			BuildTime:   baseTime.AddDate(0, i, 0),
+			License:     "MIT",
+		}
+
+		secondBuild := basePackage
+
+		secondBuild.Version = fmt.Sprintf("%d.1", i)
+		secondBuild.BuildTime = basePackage.BuildTime.AddDate(0, 0, 1)
+
+		packageList = append(packageList, basePackage, secondBuild)
+	}
+
+	return packageList
+}
+
 var basePackageList = fetchPackageList{
-	rpmmd.PackageList{
-		{Name: "package1"},
-		{Name: "package2"},
-	},
+	generatePackageList(),
 	nil,
 }
 
@@ -17,14 +50,14 @@ var BaseFixture = Fixture{
 	depsolve{
 		[]rpmmd.PackageSpec{
 			{
-				Name:    "libgpg-error",
+				Name:    "dep-package1",
 				Epoch:   0,
 				Version: "1.33",
 				Release: "2.fc30",
 				Arch:    "x86_64",
 			},
 			{
-				Name:    "libsemanage",
+				Name:    "dep-package2",
 				Epoch:   0,
 				Version: "2.9",
 				Release: "1.fc30",
@@ -56,3 +89,20 @@ var BadDepsolve = Fixture{
 		},
 	},
 }
+
+var BadFetch = Fixture{
+	fetchPackageList{
+		ret: nil,
+		err: &rpmmd.DNFError{
+			Kind:   "FetchError",
+			Reason: "There was a problem when fetching packages.",
+		},
+	},
+	depsolve{
+		nil,
+		&rpmmd.DNFError{
+			Kind:   "DepsolveError",
+			Reason: "There was a problem depsolving ['go2rpm']: \n Problem: conflicting requests\n  - nothing provides askalono-cli needed by go2rpm-1-4.fc31.noarch",
+		},
+	},
+}