[GITEA] Add repo empty check for branch feed

- If you attempted to get a branch feed on a empty repository, it would
result in a panic as the code expects that the branch exists.
- `context.RepoRefByType` would normally already 404 if the branch
doesn't exist, however if a repository is empty, it would not do this
check.
- Fix bug where `/atom/branch/*` would return a RSS feed.

(cherry picked from commit d27bcd98a41b69e313535e5e91e4272136a4bab1)
(cherry picked from commit 07916c87235f246c809d61b74c55e796eca23fc8)
(cherry picked from commit 2eedbe0c55cb7109eb722ab9172933a26e878307)
(cherry picked from commit 3810d905c6)

routers/web/feed/render.go

@@ -8,11 +8,12 @@ import (
 )
 
 // RenderBranchFeed render format for branch or file
-func RenderBranchFeed(ctx *context.Context) {
-	_, _, showFeedType := GetFeedType(ctx.Params(":reponame"), ctx.Req)
-	if ctx.Repo.TreePath == "" {
-		ShowBranchFeed(ctx, ctx.Repo.Repository, showFeedType)
-	} else {
-		ShowFileFeed(ctx, ctx.Repo.Repository, showFeedType)
+func RenderBranchFeed(feedType string) func(ctx *context.Context) {
+	return func(ctx *context.Context) {
+		if ctx.Repo.TreePath == "" {
+			ShowBranchFeed(ctx, ctx.Repo.Repository, feedType)
+		} else {
+			ShowFileFeed(ctx, ctx.Repo.Repository, feedType)
+		}
 	}
 }

routers/web/repo/view.go

@@ -726,12 +726,19 @@ func Home(ctx *context.Context) {
 	if setting.Other.EnableFeed {
 		isFeed, _, showFeedType := feed.GetFeedType(ctx.Params(":reponame"), ctx.Req)
 		if isFeed {
-			switch {
-			case ctx.Link == fmt.Sprintf("%s.%s", ctx.Repo.RepoLink, showFeedType):
+			if ctx.Link == fmt.Sprintf("%s.%s", ctx.Repo.RepoLink, showFeedType) {
 				feed.ShowRepoFeed(ctx, ctx.Repo.Repository, showFeedType)
-			case ctx.Repo.TreePath == "":
+				return
+			}
+
+			if ctx.Repo.Repository.IsEmpty {
+				ctx.NotFound("MustBeNotEmpty", nil)
+				return
+			}
+
+			if ctx.Repo.TreePath == "" {
 				feed.ShowBranchFeed(ctx, ctx.Repo.Repository, showFeedType)
-			case ctx.Repo.TreePath != "":
+			} else {
 				feed.ShowFileFeed(ctx, ctx.Repo.Repository, showFeedType)
 			}
 			return

routers/web/web.go

@@ -1461,8 +1461,8 @@ func registerRoutes(m *web.Route) {
 			m.Get("/cherry-pick/{sha:([a-f0-9]{7,40})$}", repo.SetEditorconfigIfExists, repo.CherryPick)
 		}, repo.MustBeNotEmpty, context.RepoRef(), reqRepoCodeReader)
 
-		m.Get("/rss/branch/*", context.RepoRefByType(context.RepoRefBranch), feedEnabled, feed.RenderBranchFeed)
-		m.Get("/atom/branch/*", context.RepoRefByType(context.RepoRefBranch), feedEnabled, feed.RenderBranchFeed)
+		m.Get("/rss/branch/*", repo.MustBeNotEmpty, context.RepoRefByType(context.RepoRefBranch), feedEnabled, feed.RenderBranchFeed("rss"))
+		m.Get("/atom/branch/*", repo.MustBeNotEmpty, context.RepoRefByType(context.RepoRefBranch), feedEnabled, feed.RenderBranchFeed("atom"))
 
 		m.Group("/src", func() {
 			m.Get("/branch/*", context.RepoRefByType(context.RepoRefBranch), repo.Home)

tests/integration/api_feed_user_test.go

@@ -7,15 +7,19 @@ import (
 	"net/http"
 	"testing"
 
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
 )
 
 func TestFeed(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
 	t.Run("User", func(t *testing.T) {
 		t.Run("Atom", func(t *testing.T) {
-			defer tests.PrepareTestEnv(t)()
+			defer tests.PrintCurrentTest(t)()
 
 			req := NewRequest(t, "GET", "/user2.atom")
 			resp := MakeRequest(t, req, http.StatusOK)
@@ -25,7 +29,7 @@ func TestFeed(t *testing.T) {
 		})
 
 		t.Run("RSS", func(t *testing.T) {
-			defer tests.PrepareTestEnv(t)()
+			defer tests.PrintCurrentTest(t)()
 
 			req := NewRequest(t, "GET", "/user2.rss")
 			resp := MakeRequest(t, req, http.StatusOK)
@@ -34,4 +38,51 @@ func TestFeed(t *testing.T) {
 			assert.Contains(t, data, `<rss version="2.0"`)
 		})
 	})
+
+	t.Run("Repo", func(t *testing.T) {
+		t.Run("Normal", func(t *testing.T) {
+			t.Run("Atom", func(t *testing.T) {
+				defer tests.PrintCurrentTest(t)()
+
+				req := NewRequest(t, "GET", "/user2/repo1/atom/branch/master")
+				resp := MakeRequest(t, req, http.StatusOK)
+
+				data := resp.Body.String()
+				assert.Contains(t, data, `<feed xmlns="http://www.w3.org/2005/Atom"`)
+			})
+			t.Run("RSS", func(t *testing.T) {
+				defer tests.PrintCurrentTest(t)()
+
+				req := NewRequest(t, "GET", "/user2/repo1/rss/branch/master")
+				resp := MakeRequest(t, req, http.StatusOK)
+
+				data := resp.Body.String()
+				assert.Contains(t, data, `<rss version="2.0"`)
+			})
+		})
+		t.Run("Empty", func(t *testing.T) {
+			err := user_model.UpdateUserCols(db.DefaultContext, &user_model.User{ID: 30, ProhibitLogin: false}, "prohibit_login")
+			assert.NoError(t, err)
+
+			session := loginUser(t, "user30")
+			t.Run("Atom", func(t *testing.T) {
+				defer tests.PrintCurrentTest(t)()
+
+				req := NewRequest(t, "GET", "/user30/empty/atom/branch/master")
+				session.MakeRequest(t, req, http.StatusNotFound)
+
+				req = NewRequest(t, "GET", "/user30/empty.atom/src/branch/master")
+				session.MakeRequest(t, req, http.StatusNotFound)
+			})
+			t.Run("RSS", func(t *testing.T) {
+				defer tests.PrintCurrentTest(t)()
+
+				req := NewRequest(t, "GET", "/user30/empty/rss/branch/master")
+				session.MakeRequest(t, req, http.StatusNotFound)
+
+				req = NewRequest(t, "GET", "/user30/empty.rss/src/branch/master")
+				session.MakeRequest(t, req, http.StatusNotFound)
+			})
+		})
+	})
 }