Delete tag API (#13358)

* Delete tag API

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Wording

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Add conflict response and fix API tests

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix other test

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/api/v1/api.go

@@ -798,7 +798,9 @@ func RegisterRoutes(m *macaron.Macaron) {
 						})
 					})
 					m.Group("/tags", func() {
-						m.Get("/:tag", repo.GetReleaseTag)
+						m.Combo("/:tag").
+							Get(repo.GetReleaseTag).
+							Delete(reqToken(), reqRepoWriter(models.UnitTypeReleases), repo.DeleteReleaseTag)
 					})
 				}, reqRepoReader(models.UnitTypeReleases))
 				m.Post("/mirror-sync", reqToken(), reqRepoWriter(models.UnitTypeCode), repo.MirrorSync)

routers/api/v1/repo/release_tags.go

@@ -5,11 +5,13 @@
 package repo
 
 import (
+	"errors"
 	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
+	releaseservice "code.gitea.io/gitea/services/release"
 )
 
 // GetReleaseTag get a single release of a repository by its tagname
@@ -59,3 +61,56 @@ func GetReleaseTag(ctx *context.APIContext) {
 	}
 	ctx.JSON(http.StatusOK, convert.ToRelease(release))
 }
+
+// DeleteReleaseTag delete a tag from a repository
+func DeleteReleaseTag(ctx *context.APIContext) {
+	// swagger:operation DELETE /repos/{owner}/{repo}/releases/tags/{tag} repository repoDeleteReleaseTag
+	// ---
+	// summary: Delete a release tag
+	// 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: tag
+	//   in: path
+	//   description: name of the tag to delete
+	//   type: string
+	//   required: true
+	// responses:
+	//   "204":
+	//     "$ref": "#/responses/empty"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "409":
+	//     "$ref": "#/responses/conflict"
+
+	tag := ctx.Params(":tag")
+
+	release, err := models.GetRelease(ctx.Repo.Repository.ID, tag)
+	if err != nil {
+		if models.IsErrReleaseNotExist(err) {
+			ctx.Error(http.StatusNotFound, "GetRelease", err)
+			return
+		}
+		ctx.Error(http.StatusInternalServerError, "GetRelease", err)
+		return
+	}
+
+	if !release.IsTag {
+		ctx.Error(http.StatusConflict, "IsTag", errors.New("a tag attached to a release cannot be deleted directly"))
+		return
+	}
+
+	if err := releaseservice.DeleteReleaseByID(release.ID, ctx.User, true); err != nil {
+		ctx.Error(http.StatusInternalServerError, "DeleteReleaseByID", err)
+	}
+
+	ctx.Status(http.StatusNoContent)
+}