Added URL mapping for Release attachments like on github.com (#1707)

routers/repo/repo.go

@@ -310,6 +310,38 @@ func Action(ctx *context.Context) {
 	ctx.RedirectToFirst(ctx.Query("redirect_to"), ctx.Repo.RepoLink)
 }
 
+// RedirectDownload return a file based on the following infos:
+func RedirectDownload(ctx *context.Context) {
+	var (
+		vTag     = ctx.Params("vTag")
+		fileName = ctx.Params("fileName")
+	)
+	tagNames := []string{vTag}
+	curRepo := ctx.Repo.Repository
+	releases, err := models.GetReleasesByRepoIDAndNames(curRepo.ID, tagNames)
+	if err != nil {
+		if models.IsErrAttachmentNotExist(err) {
+			ctx.Error(404)
+			return
+		}
+		ctx.ServerError("RedirectDownload", err)
+		return
+	}
+	if len(releases) == 1 {
+		release := releases[0]
+		att, err := models.GetAttachmentByReleaseIDFileName(release.ID, fileName)
+		if err != nil {
+			ctx.Error(404)
+			return
+		}
+		if att != nil {
+			ctx.Redirect(setting.AppSubURL + "/attachments/" + att.UUID)
+			return
+		}
+	}
+	ctx.Error(404)
+}
+
 // Download download an archive of a repository
 func Download(ctx *context.Context) {
 	var (

routers/routes/routes.go

@@ -475,6 +475,9 @@ func RegisterRoutes(m *macaron.Macaron) {
 		}, context.RepoIDAssignment(), context.UnitTypes(), reqRepoCodeReader)
 	}, reqSignIn)
 
+	// ***** Release Attachment Download without Signin
+	m.Get("/:username/:reponame/releases/download/:vTag/:fileName", ignSignIn, context.RepoAssignment(), repo.MustBeNotBare, repo.RedirectDownload)
+
 	m.Group("/:username/:reponame", func() {
 		m.Group("/settings", func() {
 			m.Combo("").Get(repo.Settings).