Remove util.URLJoin and replace all callers with direct path concatenation (#36867)

`util.URLJoin` was deprecated with unclear semantics (path normalization
via `url.Parse`/`ResolveReference` that surprised callers). This removes
it entirely and replaces all usages with straightforward `"/"` string
concatenation.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>

modules/markup/html_internal_test.go

@@ -23,12 +23,12 @@ const (
 
 // externalIssueLink an HTML link to an alphanumeric-style issue
 func externalIssueLink(baseURL, class, name string) string {
-	return link(util.URLJoin(baseURL, name), class, name)
+	return link(strings.TrimSuffix(baseURL, "/")+"/"+name, class, name)
 }
 
 // numericLink an HTML to a numeric-style issue
 func numericIssueLink(baseURL, class string, index int, marker string) string {
-	return link(util.URLJoin(baseURL, strconv.Itoa(index)), class, fmt.Sprintf("%s%d", marker, index))
+	return link(strings.TrimSuffix(baseURL, "/")+"/"+strconv.Itoa(index), class, fmt.Sprintf("%s%d", marker, index))
 }
 
 // link an HTML link
@@ -116,7 +116,7 @@ func TestRender_IssueIndexPattern2(t *testing.T) {
 
 		links := make([]any, len(indices))
 		for i, index := range indices {
-			links[i] = numericIssueLink(util.URLJoin("/test-owner/test-repo", path), "ref-issue", index, marker)
+			links[i] = numericIssueLink("/test-owner/test-repo/"+path, "ref-issue", index, marker)
 		}
 		expectedNil := fmt.Sprintf(expectedFmt, links...)
 		testRenderIssueIndexPattern(t, s, expectedNil, NewTestRenderContext(TestAppURL, localMetas))
@@ -210,7 +210,7 @@ func TestRender_IssueIndexPattern5(t *testing.T) {
 		metas["regexp"] = pattern
 		links := make([]any, len(ids))
 		for i, id := range ids {
-			links[i] = link(util.URLJoin("https://someurl.com/someUser/someRepo/", id), "ref-issue ref-external-issue", names[i])
+			links[i] = link("https://someurl.com/someUser/someRepo/"+id, "ref-issue ref-external-issue", names[i])
 		}
 
 		expected := fmt.Sprintf(expectedFmt, links...)
@@ -288,11 +288,11 @@ func TestRender_AutoLink(t *testing.T) {
 	}
 
 	// render valid issue URLs
-	test(util.URLJoin(TestRepoURL, "issues", "3333"),
-		numericIssueLink(util.URLJoin(TestRepoURL, "issues"), "ref-issue", 3333, "#"))
+	test(TestRepoURL+"issues/3333",
+		numericIssueLink(TestRepoURL+"issues", "ref-issue", 3333, "#"))
 
 	// render valid commit URLs
-	tmp := util.URLJoin(TestRepoURL, "commit", "d8a994ef243349f321568f9e36d5c3f444b99cae")
+	tmp := TestRepoURL + "commit/d8a994ef243349f321568f9e36d5c3f444b99cae"
 	test(tmp, "<a href=\""+tmp+"\" class=\"commit\"><code>d8a994ef24</code></a>")
 	tmp += "#diff-2"
 	test(tmp, "<a href=\""+tmp+"\" class=\"commit\"><code>d8a994ef24 (diff-2)</code></a>")

modules/markup/html_test.go

@@ -34,15 +34,15 @@ func TestRender_Commits(t *testing.T) {
 
 	sha := "65f1bf27bc3bf70f64657658635e66094edbcb4d"
 	repo := markup.TestAppURL + testRepoOwnerName + "/" + testRepoName + "/"
-	commit := util.URLJoin(repo, "commit", sha)
+	commit := repo + "commit/" + sha
 	commitPath := "/user13/repo11/commit/" + sha
-	tree := util.URLJoin(repo, "tree", sha, "src")
+	tree := repo + "tree/" + sha + "/src"
 
-	file := util.URLJoin(repo, "commit", sha, "example.txt")
+	file := repo + "commit/" + sha + "/example.txt"
 	fileWithExtra := file + ":"
 	fileWithHash := file + "#L2"
 	fileWithHasExtra := file + "#L2:"
-	commitCompare := util.URLJoin(repo, "compare", sha+"..."+sha)
+	commitCompare := repo + "compare/" + sha + "..." + sha
 	commitCompareWithHash := commitCompare + "#L2"
 
 	test(sha, `<p><a href="`+commitPath+`" rel="nofollow"><code>65f1bf27bc</code></a></p>`)
@@ -90,14 +90,14 @@ func TestRender_CrossReferences(t *testing.T) {
 		"/home/gitea/go-gitea/gitea#12345",
 		`<p>/home/gitea/go-gitea/gitea#12345</p>`)
 	test(
-		util.URLJoin(markup.TestAppURL, "gogitea", "gitea", "issues", "12345"),
-		`<p><a href="`+util.URLJoin(markup.TestAppURL, "gogitea", "gitea", "issues", "12345")+`" class="ref-issue" rel="nofollow">gogitea/gitea#12345</a></p>`)
+		markup.TestAppURL+"gogitea/gitea/issues/12345",
+		`<p><a href="`+markup.TestAppURL+`gogitea/gitea/issues/12345" class="ref-issue" rel="nofollow">gogitea/gitea#12345</a></p>`)
 	test(
-		util.URLJoin(markup.TestAppURL, "go-gitea", "gitea", "issues", "12345"),
-		`<p><a href="`+util.URLJoin(markup.TestAppURL, "go-gitea", "gitea", "issues", "12345")+`" class="ref-issue" rel="nofollow">go-gitea/gitea#12345</a></p>`)
+		markup.TestAppURL+"go-gitea/gitea/issues/12345",
+		`<p><a href="`+markup.TestAppURL+`go-gitea/gitea/issues/12345" class="ref-issue" rel="nofollow">go-gitea/gitea#12345</a></p>`)
 	test(
-		util.URLJoin(markup.TestAppURL, "gogitea", "some-repo-name", "issues", "12345"),
-		`<p><a href="`+util.URLJoin(markup.TestAppURL, "gogitea", "some-repo-name", "issues", "12345")+`" class="ref-issue" rel="nofollow">gogitea/some-repo-name#12345</a></p>`)
+		markup.TestAppURL+"gogitea/some-repo-name/issues/12345",
+		`<p><a href="`+markup.TestAppURL+`gogitea/some-repo-name/issues/12345" class="ref-issue" rel="nofollow">gogitea/some-repo-name#12345</a></p>`)
 
 	inputURL := setting.AppURL + "a/b/commit/0123456789012345678901234567890123456789/foo.txt?a=b#L2-L3"
 	test(
@@ -375,7 +375,7 @@ func TestRender_emoji(t *testing.T) {
 
 func TestRender_ShortLinks(t *testing.T) {
 	setting.AppURL = markup.TestAppURL
-	tree := util.URLJoin(markup.TestRepoURL, "src", "master")
+	tree := markup.TestRepoURL + "src/master"
 
 	test := func(input, expected string) {
 		buffer, err := markdown.RenderString(markup.NewTestRenderContext(tree), input)
@@ -383,15 +383,15 @@ func TestRender_ShortLinks(t *testing.T) {
 		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(string(buffer)))
 	}
 
-	url := util.URLJoin(tree, "Link")
-	otherURL := util.URLJoin(tree, "Other-Link")
-	encodedURL := util.URLJoin(tree, "Link%3F")
-	imgurl := util.URLJoin(tree, "Link.jpg")
-	otherImgurl := util.URLJoin(tree, "Link+Other.jpg")
-	encodedImgurl := util.URLJoin(tree, "Link+%23.jpg")
-	notencodedImgurl := util.URLJoin(tree, "some", "path", "Link%20#.jpg")
-	renderableFileURL := util.URLJoin(tree, "markdown_file.md")
-	unrenderableFileURL := util.URLJoin(tree, "file.zip")
+	url := tree + "/Link"
+	otherURL := tree + "/Other-Link"
+	encodedURL := tree + "/Link%3F"
+	imgurl := tree + "/Link.jpg"
+	otherImgurl := tree + "/Link+Other.jpg"
+	encodedImgurl := tree + "/Link+%23.jpg"
+	notencodedImgurl := tree + "/some/path/Link%20#.jpg"
+	renderableFileURL := tree + "/markdown_file.md"
+	unrenderableFileURL := tree + "/file.zip"
 	favicon := "http://google.com/favicon.ico"
 
 	test(

modules/util/url.go

@@ -5,7 +5,6 @@ package util
 
 import (
 	"net/url"
-	"path"
 	"strings"
 )
 
@@ -19,29 +18,6 @@ func PathEscapeSegments(path string) string {
 	return escapedPath
 }
 
-// URLJoin joins url components, like path.Join, but preserving contents
-// Deprecated: it has unclear behaviors, should not be used anymore. It is only used in some tests.
-// Need to be removed in the future.
-func URLJoin(base string, elems ...string) string {
-	if !strings.HasSuffix(base, "/") {
-		base += "/"
-	}
-	baseURL, err := url.Parse(base)
-	if err != nil {
-		return ""
-	}
-	joinedPath := path.Join(elems...)
-	argURL, err := url.Parse(joinedPath)
-	if err != nil {
-		return ""
-	}
-	joinedURL := baseURL.ResolveReference(argURL).String()
-	if !baseURL.IsAbs() && !strings.HasPrefix(base, "/") {
-		return joinedURL[1:] // Removing leading '/' if needed
-	}
-	return joinedURL
-}
-
 func SanitizeURL(s string) (string, error) {
 	u, err := url.Parse(s)
 	if err != nil {

modules/util/util_test.go

@@ -11,39 +11,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestURLJoin(t *testing.T) {
-	type test struct {
-		Expected string
-		Base     string
-		Elements []string
-	}
-	newTest := func(expected, base string, elements ...string) test {
-		return test{Expected: expected, Base: base, Elements: elements}
-	}
-	for _, test := range []test{
-		newTest("https://try.gitea.io/a/b/c",
-			"https://try.gitea.io", "a/b", "c"),
-		newTest("https://try.gitea.io/a/b/c",
-			"https://try.gitea.io/", "/a/b/", "/c/"),
-		newTest("https://try.gitea.io/a/c",
-			"https://try.gitea.io/", "/a/./b/", "../c/"),
-		newTest("a/b/c",
-			"a", "b/c/"),
-		newTest("a/b/d",
-			"a/", "b/c/", "/../d/"),
-		newTest("https://try.gitea.io/a/b/c#d",
-			"https://try.gitea.io", "a/b", "c#d"),
-		newTest("/a/b/d",
-			"/a/", "b/c/", "/../d/"),
-		newTest("/a/b/c",
-			"/a", "b/c/"),
-		newTest("/a/b/c#hash",
-			"/a", "b/c#hash"),
-	} {
-		assert.Equal(t, test.Expected, URLJoin(test.Base, test.Elements...))
-	}
-}
-
 func TestIsEmptyString(t *testing.T) {
 	cases := []struct {
 		s        string

services/convert/git_commit_test.go

@@ -11,7 +11,6 @@ import (
 	"code.gitea.io/gitea/models/unittest"
 	"code.gitea.io/gitea/modules/git"
 	api "code.gitea.io/gitea/modules/structs"
-	"code.gitea.io/gitea/modules/util"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -35,7 +34,7 @@ func TestToCommitMeta(t *testing.T) {
 	assert.NotNil(t, commitMeta)
 	assert.Equal(t, &api.CommitMeta{
 		SHA:     sha1.EmptyObjectID().String(),
-		URL:     util.URLJoin(headRepo.APIURL(), "git/commits", sha1.EmptyObjectID().String()),
+		URL:     headRepo.APIURL() + "/git/commits/" + sha1.EmptyObjectID().String(),
 		Created: time.Unix(0, 0),
 	}, commitMeta)
 }

tests/integration/api_packages_rpm_test.go

@@ -20,7 +20,6 @@ import (
 	user_model "code.gitea.io/gitea/models/user"
 	rpm_module "code.gitea.io/gitea/modules/packages/rpm"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/ProtonMail/go-crypto/openpgp"
@@ -99,7 +98,7 @@ gpgcheck=1
 gpgkey=%sapi/packages/%s/rpm/repository.key`,
 					strings.Join(append([]string{user.LowerName}, groupParts...), "-"),
 					strings.Join(append([]string{user.Name, setting.AppName}, groupParts...), " - "),
-					util.URLJoin(setting.AppURL, groupURL),
+					strings.TrimSuffix(setting.AppURL, "/")+groupURL,
 					setting.AppURL,
 					user.Name,
 				)

tests/integration/api_repo_git_tags_test.go

@@ -14,7 +14,6 @@ import (
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/gitrepo"
 	api "code.gitea.io/gitea/modules/structs"
-	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
@@ -58,7 +57,7 @@ func TestAPIGitTags(t *testing.T) {
 	assert.Equal(t, aTagMessage+"\n", tag.Message)
 	assert.Equal(t, user.Name, tag.Tagger.Name)
 	assert.Equal(t, user.Email, tag.Tagger.Email)
-	assert.Equal(t, util.URLJoin(repo.APIURL(), "git/tags", aTag.ID.String()), tag.URL)
+	assert.Equal(t, repo.APIURL()+"/git/tags/"+aTag.ID.String(), tag.URL)
 
 	// Should NOT work for lightweight tags
 	badReq := NewRequestf(t, "GET", "/api/v1/repos/%s/%s/git/tags/%s", user.Name, repo.Name, commit.ID.String()).