Add API for gitignore templates (#22783)

This implements the [Gitignores template API of GitHub](https://docs.github.com/en/rest/gitignore?apiVersion=2022-11-28) in Gitea

modules/structs/miscellaneous.go

@@ -72,6 +72,12 @@ type ServerVersion struct {
 	Version string `json:"version"`
 }
 
+// GitignoreTemplateInfo name and text of a gitignore template
+type GitignoreTemplateInfo struct {
+	Name   string `json:"name"`
+	Source string `json:"source"`
+}
+
 // LicensesListEntry is used for the API
 type LicensesTemplateListEntry struct {
 	Key  string `json:"key"`

routers/api/v1/api.go

@@ -719,6 +719,8 @@ func Routes(ctx gocontext.Context) *web.Route {
 		m.Post("/markup", bind(api.MarkupOption{}), misc.Markup)
 		m.Post("/markdown", bind(api.MarkdownOption{}), misc.Markdown)
 		m.Post("/markdown/raw", misc.MarkdownRaw)
+		m.Get("/gitignore/templates", misc.ListGitignoresTemplates)
+		m.Get("/gitignore/templates/{name}", misc.GetGitignoreTemplateInfo)
 		m.Get("/licenses", misc.ListLicenseTemplates)
 		m.Get("/licenses/{name}", misc.GetLicenseTemplateInfo)
 		m.Group("/settings", func() {

routers/api/v1/misc/gitignore.go

@@ -0,0 +1,56 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package misc
+
+import (
+	"net/http"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/options"
+	repo_module "code.gitea.io/gitea/modules/repository"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+)
+
+// Shows a list of all Gitignore templates
+func ListGitignoresTemplates(ctx *context.APIContext) {
+	// swagger:operation GET /gitignore/templates miscellaneous listGitignoresTemplates
+	// ---
+	// summary: Returns a list of all gitignore templates
+	// produces:
+	// - application/json
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/GitignoreTemplateList"
+	ctx.JSON(http.StatusOK, repo_module.Gitignores)
+}
+
+// SHows information about a gitignore template
+func GetGitignoreTemplateInfo(ctx *context.APIContext) {
+	// swagger:operation GET /gitignore/templates/{name} miscellaneous getGitignoreTemplateInfo
+	// ---
+	// summary: Returns information about a gitignore template
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: name
+	//   in: path
+	//   description: name of the template
+	//   type: string
+	//   required: true
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/GitignoreTemplateInfo"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	name := util.PathJoinRelX(ctx.Params("name"))
+
+	text, err := options.Gitignore(name)
+	if err != nil {
+		ctx.NotFound()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, &structs.GitignoreTemplateInfo{Name: name, Source: string(text)})
+}

routers/api/v1/swagger/misc.go

@@ -14,6 +14,20 @@ type swaggerResponseServerVersion struct {
 	Body api.ServerVersion `json:"body"`
 }
 
+// GitignoreTemplateList
+// swagger:response GitignoreTemplateList
+type swaggerResponseGitignoreTemplateList struct {
+	// in:body
+	Body []string `json:"body"`
+}
+
+// GitignoreTemplateInfo
+// swagger:response GitignoreTemplateInfo
+type swaggerResponseGitignoreTemplateInfo struct {
+	// in:body
+	Body api.GitignoreTemplateInfo `json:"body"`
+}
+
 // LicenseTemplateList
 // swagger:response LicenseTemplateList
 type swaggerResponseLicensesTemplateList struct {

tests/integration/api_gitignore_templates_test.go

@@ -0,0 +1,53 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+
+	"code.gitea.io/gitea/modules/options"
+	repo_module "code.gitea.io/gitea/modules/repository"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAPIListGitignoresTemplates(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	req := NewRequest(t, "GET", "/api/v1/gitignore/templates")
+	resp := MakeRequest(t, req, http.StatusOK)
+
+	// This tests if the API returns a list of strings
+	var gitignoreList []string
+	DecodeJSON(t, resp, &gitignoreList)
+}
+
+func TestAPIGetGitignoreTemplateInfo(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	// If Gitea has for some reason no Gitignore templates, we need to skip this test
+	if len(repo_module.Gitignores) == 0 {
+		return
+	}
+
+	// Use the first template for the test
+	templateName := repo_module.Gitignores[0]
+
+	urlStr := fmt.Sprintf("/api/v1/gitignore/templates/%s", templateName)
+	req := NewRequest(t, "GET", urlStr)
+	resp := MakeRequest(t, req, http.StatusOK)
+
+	var templateInfo api.GitignoreTemplateInfo
+	DecodeJSON(t, resp, &templateInfo)
+
+	// We get the text of the template here
+	text, _ := options.Gitignore(templateName)
+
+	assert.Equal(t, templateInfo.Name, templateName)
+	assert.Equal(t, templateInfo.Source, string(text))
+}