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

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 {