Add an api endpoint to fetch git notes (#15373) (#16649)

close #15373

routers/api/v1/api.go

@@ -953,6 +953,7 @@ func Routes() *web.Route {
 					m.Get("/trees/{sha}", context.RepoRefForAPI, repo.GetTree)
 					m.Get("/blobs/{sha}", context.RepoRefForAPI, repo.GetBlob)
 					m.Get("/tags/{sha}", context.RepoRefForAPI, repo.GetAnnotatedTag)
+					m.Get("/notes/{sha}", repo.GetNote)
 				}, reqRepoReader(models.UnitTypeCode))
 				m.Group("/contents", func() {
 					m.Get("", repo.GetContentsList)

routers/api/v1/repo/notes.go

@@ -0,0 +1,82 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package repo
+
+import (
+	"fmt"
+	"net/http"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/convert"
+	"code.gitea.io/gitea/modules/git"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/validation"
+)
+
+// GetNote Get a note corresponding to a single commit from a repository
+func GetNote(ctx *context.APIContext) {
+	// swagger:operation GET /repos/{owner}/{repo}/git/notes/{sha} repository repoGetNote
+	// ---
+	// summary: Get a note corresponding to a single commit from a repository
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: owner
+	//   in: path
+	//   description: owner of the repo
+	//   type: string
+	//   required: true
+	// - name: repo
+	//   in: path
+	//   description: name of the repo
+	//   type: string
+	//   required: true
+	// - name: sha
+	//   in: path
+	//   description: a git ref or commit sha
+	//   type: string
+	//   required: true
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/Note"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
+	sha := ctx.Params(":sha")
+	if (validation.GitRefNamePatternInvalid.MatchString(sha) || !validation.CheckGitRefAdditionalRulesValid(sha)) && !git.SHAPattern.MatchString(sha) {
+		ctx.Error(http.StatusUnprocessableEntity, "no valid ref or sha", fmt.Sprintf("no valid ref or sha: %s", sha))
+		return
+	}
+	getNote(ctx, sha)
+}
+
+func getNote(ctx *context.APIContext, identifier string) {
+	gitRepo, err := git.OpenRepository(ctx.Repo.Repository.RepoPath())
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "OpenRepository", err)
+		return
+	}
+	defer gitRepo.Close()
+	var note git.Note
+	err = git.GetNote(ctx, gitRepo, identifier, &note)
+	if err != nil {
+		if git.IsErrNotExist(err) {
+			ctx.NotFound(identifier)
+			return
+		}
+		ctx.Error(http.StatusInternalServerError, "GetNote", err)
+		return
+	}
+
+	cmt, err := convert.ToCommit(ctx.Repo.Repository, note.Commit, nil)
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "ToCommit", err)
+		return
+	}
+	apiNote := api.Note{Message: string(note.Message), Commit: cmt}
+	ctx.JSON(http.StatusOK, apiNote)
+}

routers/api/v1/swagger/repo.go

@@ -254,6 +254,13 @@ type swaggerCommitList struct {
 	Body []api.Commit `json:"body"`
 }
 
+// Note
+// swagger:response Note
+type swaggerNote struct {
+	// in: body
+	Body api.Note `json:"body"`
+}
+
 // EmptyRepository
 // swagger:response EmptyRepository
 type swaggerEmptyRepository struct {