Implement update branch API

modules/structs/repo.go

@@ -278,6 +278,16 @@ type CreateBranchRepoOption struct {
 	OldRefName string `json:"old_ref_name" binding:"GitRefName;MaxSize(100)"`
 }
 
+// UpdateBranchRepoOption options when updating a branch in a repository
+// swagger:model
+type UpdateBranchRepoOption struct {
+	// New branch name
+	//
+	// required: true
+	// unique: true
+	Name string `json:"name" binding:"Required;GitRefName;MaxSize(100)"`
+}
+
 // TransferRepoOption options when transfer a repository's ownership
 // swagger:model
 type TransferRepoOption struct {

routers/api/v1/api.go

@@ -1195,6 +1195,7 @@ func Routes() *web.Router {
 					m.Get("/*", repo.GetBranch)
 					m.Delete("/*", reqToken(), reqRepoWriter(unit.TypeCode), mustNotBeArchived, repo.DeleteBranch)
 					m.Post("", reqToken(), reqRepoWriter(unit.TypeCode), mustNotBeArchived, bind(api.CreateBranchRepoOption{}), repo.CreateBranch)
+					m.Patch("/*", reqToken(), reqRepoWriter(unit.TypeCode), mustNotBeArchived, bind(api.UpdateBranchRepoOption{}), repo.UpdateBranch)
 				}, context.ReferencesGitRepo(), reqRepoReader(unit.TypeCode))
 				m.Group("/branch_protections", func() {
 					m.Get("", repo.ListBranchProtections)

routers/api/v1/repo/branch.go

@@ -386,6 +386,77 @@ func ListBranches(ctx *context.APIContext) {
 	ctx.JSON(http.StatusOK, apiBranches)
 }
 
+// UpdateBranch updates a repository's branch.
+func UpdateBranch(ctx *context.APIContext) {
+	// swagger:operation PATCH /repos/{owner}/{repo}/branches/{branch} repository repoUpdateBranch
+	// ---
+	// summary: Update a branch
+	// consumes:
+	// - application/json
+	// 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: branch
+	//   in: path
+	//   description: name of the branch
+	//   type: string
+	//   required: true
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/UpdateBranchRepoOption"
+	// responses:
+	//   "204":
+	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
+	opt := web.GetForm(ctx).(*api.UpdateBranchRepoOption)
+
+	oldName := ctx.PathParam("*")
+	repo := ctx.Repo.Repository
+
+	if repo.IsEmpty {
+		ctx.Error(http.StatusNotFound, "", "Git Repository is empty.")
+		return
+	}
+
+	if repo.IsMirror {
+		ctx.Error(http.StatusForbidden, "", "Git Repository is a mirror.")
+		return
+	}
+
+	msg, err := repo_service.RenameBranch(ctx, repo, ctx.Doer, ctx.Repo.GitRepo, oldName, opt.Name)
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "RenameBranch", err)
+		return
+	}
+	if msg == "target_exist" {
+		ctx.Error(http.StatusUnprocessableEntity, "", "Cannot rename a branch using the same name or rename to a branch that already exists.")
+		return
+	}
+	if msg == "from_not_exist" {
+		ctx.Error(http.StatusNotFound, "", "Branch doesn't exist.")
+		return
+	}
+
+	ctx.Status(http.StatusNoContent)
+}
+
 // GetBranchProtection gets a branch protection
 func GetBranchProtection(ctx *context.APIContext) {
 	// swagger:operation GET /repos/{owner}/{repo}/branch_protections/{name} repository repoGetBranchProtection

routers/api/v1/swagger/options.go

@@ -90,6 +90,8 @@ type swaggerParameterBodies struct {
 	// in:body
 	EditRepoOption api.EditRepoOption
 	// in:body
+	UpdateBranchRepoOption api.UpdateBranchRepoOption
+	// in:body
 	TransferRepoOption api.TransferRepoOption
 	// in:body
 	CreateForkOption api.CreateForkOption

tests/integration/api_branch_test.go

@@ -5,6 +5,7 @@ package integration
 
 import (
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"testing"
 
@@ -186,6 +187,37 @@ func testAPICreateBranch(t testing.TB, session *TestSession, user, repo, oldBran
 	return resp.Result().StatusCode == status
 }
 
+func TestAPIUpdateBranch(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, _ *url.URL) {
+		t.Run("UpdateBranchWithEmptyRepo", func(t *testing.T) {
+			testAPIUpdateBranch(t, "user10", "repo6", "master", "test", http.StatusNotFound)
+		})
+		t.Run("UpdateBranchWithSameBranchNames", func(t *testing.T) {
+			resp := testAPIUpdateBranch(t, "user2", "repo1", "master", "master", http.StatusUnprocessableEntity)
+			assert.Contains(t, resp.Body.String(), "Cannot rename a branch using the same name or rename to a branch that already exists.")
+		})
+		t.Run("UpdateBranchThatAlreadyExists", func(t *testing.T) {
+			resp := testAPIUpdateBranch(t, "user2", "repo1", "master", "branch2", http.StatusUnprocessableEntity)
+			assert.Contains(t, resp.Body.String(), "Cannot rename a branch using the same name or rename to a branch that already exists.")
+		})
+		t.Run("UpdateBranchWithNonExistentBranch", func(t *testing.T) {
+			resp := testAPIUpdateBranch(t, "user2", "repo1", "i-dont-exist", "new-branch-name", http.StatusNotFound)
+			assert.Contains(t, resp.Body.String(), "Branch doesn't exist.")
+		})
+		t.Run("RenameBranchNormalScenario", func(t *testing.T) {
+			testAPIUpdateBranch(t, "user2", "repo1", "branch2", "new-branch-name", http.StatusNoContent)
+		})
+	})
+}
+
+func testAPIUpdateBranch(t *testing.T, ownerName, repoName, from, to string, expectedHTTPStatus int) *httptest.ResponseRecorder {
+	token := getUserToken(t, ownerName, auth_model.AccessTokenScopeWriteRepository)
+	req := NewRequestWithJSON(t, "PATCH", "api/v1/repos/"+ownerName+"/"+repoName+"/branches/"+from, &api.UpdateBranchRepoOption{
+		Name: to,
+	}).AddTokenAuth(token)
+	return MakeRequest(t, req, expectedHTTPStatus)
+}
+
 func TestAPIBranchProtection(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()