From 3c7a955f05ec4c29f3c4f7412c45129b74c33e5c Mon Sep 17 00:00:00 2001
From: Gusted <postmaster@gusted.xyz>
Date: Mon, 18 Dec 2023 18:14:04 +0100
Subject: [PATCH] [GITEA] Fix NPE in `UsernameSubRoute`

- Backport of #1981
- When the user is not found in `reloadparam`, early return when the
user is not found to avoid calling `IsUserVisibleToViewer` which in turn
avoids causing a NPE.
- This fixes the case that a 500 error and 404 error is shown on the
same page.
- Add integration test for non-existant user RSS.
- Regression by c6366089df8390bc1f017006caaf4d4c69825880

(cherry picked from commit f0e06962786ef8c417b0c6f07940c1909d3b91ba)
(cherry picked from commit 75d806690875a4fc38eb1e3c904096be34657011)
(cherry picked from commit 4d0a1e0637450865c7bbac69e42d92d63b95149c)
(cherry picked from commit 5f40a485da1b2c5f129f32e2ddc2065e3ba9ccd0)
(cherry picked from commit c4cb7812e39add6f7ff3d6f3f2d4e02c66435f0e)
---
 routers/web/user/home.go       |  5 ++++-
 tests/integration/user_test.go | 29 +++++++++++++++++++----------
 2 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/routers/web/user/home.go b/routers/web/user/home.go
index ad24e6ff3c..f25f1fef92 100644
--- a/routers/web/user/home.go
+++ b/routers/web/user/home.go
@@ -841,12 +841,15 @@ func UsernameSubRoute(ctx *context.Context) {
 	reloadParam := func(suffix string) (success bool) {
 		ctx.SetParams("username", strings.TrimSuffix(username, suffix))
 		context_service.UserAssignmentWeb()(ctx)
+		if ctx.Written() {
+			return false
+		}
 		// check view permissions
 		if !user_model.IsUserVisibleToViewer(ctx, ctx.ContextUser, ctx.Doer) {
 			ctx.NotFound("user", fmt.Errorf(ctx.ContextUser.Name))
 			return false
 		}
-		return !ctx.Written()
+		return true
 	}
 	switch {
 	case strings.HasSuffix(username, ".png"):
diff --git a/tests/integration/user_test.go b/tests/integration/user_test.go
index d7fcad322e..cd067992a4 100644
--- a/tests/integration/user_test.go
+++ b/tests/integration/user_test.go
@@ -246,16 +246,25 @@ func testExportUserGPGKeys(t *testing.T, user, expected string) {
 }
 
 func TestGetUserRss(t *testing.T) {
-	user34 := "the_34-user.with.all.allowedChars"
-	req := NewRequestf(t, "GET", "/%s.rss", user34)
-	resp := MakeRequest(t, req, http.StatusOK)
-	if assert.EqualValues(t, "application/rss+xml;charset=utf-8", resp.Header().Get("Content-Type")) {
-		rssDoc := NewHTMLParser(t, resp.Body).Find("channel")
-		title, _ := rssDoc.ChildrenFiltered("title").Html()
-		assert.EqualValues(t, "Feed of &#34;the_1-user.with.all.allowedChars&#34;", title)
-		description, _ := rssDoc.ChildrenFiltered("description").Html()
-		assert.EqualValues(t, "&lt;p dir=&#34;auto&#34;&gt;some &lt;a href=&#34;https://commonmark.org/&#34; rel=&#34;nofollow&#34;&gt;commonmark&lt;/a&gt;!&lt;/p&gt;\n", description)
-	}
+	defer tests.PrepareTestEnv(t)()
+
+	t.Run("Normal", func(t *testing.T) {
+		user34 := "the_34-user.with.all.allowedChars"
+		req := NewRequestf(t, "GET", "/%s.rss", user34)
+		resp := MakeRequest(t, req, http.StatusOK)
+		if assert.EqualValues(t, "application/rss+xml;charset=utf-8", resp.Header().Get("Content-Type")) {
+			rssDoc := NewHTMLParser(t, resp.Body).Find("channel")
+			title, _ := rssDoc.ChildrenFiltered("title").Html()
+			assert.EqualValues(t, "Feed of &#34;the_1-user.with.all.allowedChars&#34;", title)
+			description, _ := rssDoc.ChildrenFiltered("description").Html()
+			assert.EqualValues(t, "&lt;p dir=&#34;auto&#34;&gt;some &lt;a href=&#34;https://commonmark.org/&#34; rel=&#34;nofollow&#34;&gt;commonmark&lt;/a&gt;!&lt;/p&gt;\n", description)
+		}
+	})
+	t.Run("Non-existent user", func(t *testing.T) {
+		session := loginUser(t, "user2")
+		req := NewRequestf(t, "GET", "/non-existent-user.rss")
+		session.MakeRequest(t, req, http.StatusNotFound)
+	})
 }
 
 func TestListStopWatches(t *testing.T) {