Fix rendering of external links (#2292)

4 files changed, 56 insertions, 79 deletions

diff --git a/modules/markdown/markdown.go b/modules/markdown/markdown.go
index 898df59292..ed673f2056 100644
--- a/modules/markdown/markdown.go
+++ b/modules/markdown/markdown.go
@@ -69,12 +69,29 @@ var (
 	// AnySHA1Pattern allows to split url containing SHA into parts
 	AnySHA1Pattern = regexp.MustCompile(`(http\S*)://(\S+)/(\S+)/(\S+)/(\S+)/([0-9a-f]{40})(?:/?([^#\s]+)?(?:#(\S+))?)?`)
 
-	// IssueFullPattern allows to split issue (and pull) URLs into parts
-	IssueFullPattern = regexp.MustCompile(`(?:^|\s|\()(http\S*)://((?:[^\s/]+/)+)((?:\w{1,10}-)?[1-9][0-9]*)([\?|#]\S+.(\S+)?)?\b`)
-
 	validLinksPattern = regexp.MustCompile(`^[a-z][\w-]+://`)
 )
 
+// regexp for full links to issues/pulls
+var issueFullPattern *regexp.Regexp
+
+// InitMarkdown initialize regexps for markdown parsing
+func InitMarkdown() {
+	getIssueFullPattern()
+}
+
+func getIssueFullPattern() *regexp.Regexp {
+	if issueFullPattern == nil {
+		appURL := setting.AppURL
+		if len(appURL) > 0 && appURL[len(appURL)-1] != '/' {
+			appURL += "/"
+		}
+		issueFullPattern = regexp.MustCompile(appURL +
+			`\w+/\w+/(?:issues|pulls)/((?:\w{1,10}-)?[1-9][0-9]*)([\?|#]\S+.(\S+)?)?\b`)
+	}
+	return issueFullPattern
+}
+
 // isLink reports whether link fits valid format.
 func isLink(link []byte) bool {
 	return validLinksPattern.Match(link)
@@ -323,32 +340,17 @@ func renderFullSha1Pattern(rawBytes []byte, urlPrefix string) []byte {
 	return rawBytes
 }
 
-// renderFullIssuePattern renders issues-like URLs
-func renderFullIssuePattern(rawBytes []byte, urlPrefix string) []byte {
-	ms := IssueFullPattern.FindAllSubmatch(rawBytes, -1)
+// RenderFullIssuePattern renders issues-like URLs
+func RenderFullIssuePattern(rawBytes []byte) []byte {
+	ms := getIssueFullPattern().FindAllSubmatch(rawBytes, -1)
 	for _, m := range ms {
 		all := m[0]
-		protocol := string(m[1])
-		paths := bytes.Split(m[2], []byte("/"))
-		paths = paths[:len(paths)-1]
-		if bytes.HasPrefix(paths[0], []byte("gist.")) {
-			continue
-		}
-		path := protocol + "://" + string(m[2])
-		id := string(m[3])
-		path = URLJoin(path, id)
-		var comment []byte
-		if len(m) > 3 {
-			comment = m[4]
-		}
-		urlSuffix := ""
+		id := string(m[1])
 		text := "#" + id
-		if comment != nil {
-			urlSuffix += string(comment)
-			text += " <i class='comment icon'></i>"
-		}
+		// TODO if m[2] is not nil, then link is to a comment,
+		// and we should indicate that in the text somehow
 		rawBytes = bytes.Replace(rawBytes, all, []byte(fmt.Sprintf(
-			`<a href="%s%s">%s</a>`, path, urlSuffix, text)), -1)
+			`<a href="%s">%s</a>`, string(all), text)), -1)
 	}
 	return rawBytes
 }
@@ -550,12 +552,12 @@ func RenderSpecialLink(rawBytes []byte, urlPrefix string, metas map[string]strin
 			[]byte(fmt.Sprintf(`<a href="%s">%s</a>`, URLJoin(setting.AppURL, string(m[1:])), m)), -1)
 	}
 
+	rawBytes = RenderFullIssuePattern(rawBytes)
 	rawBytes = RenderShortLinks(rawBytes, urlPrefix, false, isWikiMarkdown)
 	rawBytes = RenderIssueIndexPattern(rawBytes, urlPrefix, metas)
 	rawBytes = RenderCrossReferenceIssueIndexPattern(rawBytes, urlPrefix, metas)
 	rawBytes = renderFullSha1Pattern(rawBytes, urlPrefix)
 	rawBytes = renderSha1CurrentPattern(rawBytes, urlPrefix)
-	rawBytes = renderFullIssuePattern(rawBytes, urlPrefix)
 	return rawBytes
 }
 
diff --git a/modules/markdown/markdown_test.go b/modules/markdown/markdown_test.go
index cfe9c5421a..4506a29b1e 100644
--- a/modules/markdown/markdown_test.go
+++ b/modules/markdown/markdown_test.go
@@ -209,13 +209,15 @@ func TestRender_AutoLink(t *testing.T) {
 		numericIssueLink(URLJoin(setting.AppSubURL, "issues"), 3333))
 
 	// render external issue URLs
-	tmp := "http://1111/2222/ssss-issues/3333?param=blah&blahh=333"
-	test(tmp, "<a href=\""+tmp+"\">#3333 <i class='comment icon'></i></a>")
-	test("http://test.com/issues/33333", numericIssueLink("http://test.com/issues", 33333))
-	test("https://issues/333", numericIssueLink("https://issues", 333))
+	for _, externalURL := range []string{
+		"http://1111/2222/ssss-issues/3333?param=blah&blahh=333",
+		"http://test.com/issues/33333",
+		"https://issues/333"} {
+		test(externalURL, externalURL)
+	}
 
 	// render valid commit URLs
-	tmp = URLJoin(AppSubURL, "commit", "d8a994ef243349f321568f9e36d5c3f444b99cae")
+	tmp := URLJoin(AppSubURL, "commit", "d8a994ef243349f321568f9e36d5c3f444b99cae")
 	test(tmp, "<a href=\""+tmp+"\">d8a994ef24</a>")
 	tmp += "#diff-2"
 	test(tmp, "<a href=\""+tmp+"\">d8a994ef24 (diff-2)</a>")
@@ -368,6 +370,22 @@ func TestRender_CrossReferences(t *testing.T) {
 		`<p><a href="`+URLJoin(AppURL, "gogits", "gogs", "issues", "12345")+`" rel="nofollow">gogits/gogs#12345</a></p>`)
 }
 
+func TestRender_FullIssueURLs(t *testing.T) {
+	setting.AppURL = AppURL
+	setting.AppSubURL = AppSubURL
+
+	test := func(input, expected string) {
+		result := RenderFullIssuePattern([]byte(input))
+		assert.Equal(t, expected, string(result))
+	}
+	test("Here is a link https://git.osgeo.org/gogs/postgis/postgis/pulls/6",
+		"Here is a link https://git.osgeo.org/gogs/postgis/postgis/pulls/6")
+	test("Look here http://localhost:3000/person/repo/issues/4",
+		`Look here <a href="http://localhost:3000/person/repo/issues/4">#4</a>`)
+	test("http://localhost:3000/person/repo/issues/4#issuecomment-1234",
+		`<a href="http://localhost:3000/person/repo/issues/4#issuecomment-1234">#4</a>`)
+}
+
 func TestRegExp_MentionPattern(t *testing.T) {
 	trueTestCases := []string{
 		"@Unknwon",
@@ -558,50 +576,6 @@ func TestRegExp_AnySHA1Pattern(t *testing.T) {
 	}
 }
 
-func TestRegExp_IssueFullPattern(t *testing.T) {
-	testCases := map[string][]string{
-		"https://github.com/gogits/gogs/pull/3244": {
-			"https",
-			"github.com/gogits/gogs/pull/",
-			"3244",
-			"",
-			"",
-		},
-		"https://github.com/gogits/gogs/issues/3247#issuecomment-231517079": {
-			"https",
-			"github.com/gogits/gogs/issues/",
-			"3247",
-			"#issuecomment-231517079",
-			"",
-		},
-		"https://try.gogs.io/gogs/gogs/issues/4#issue-685": {
-			"https",
-			"try.gogs.io/gogs/gogs/issues/",
-			"4",
-			"#issue-685",
-			"",
-		},
-		"https://youtrack.jetbrains.com/issue/JT-36485": {
-			"https",
-			"youtrack.jetbrains.com/issue/",
-			"JT-36485",
-			"",
-			"",
-		},
-		"https://youtrack.jetbrains.com/issue/JT-36485#comment=27-1508676": {
-			"https",
-			"youtrack.jetbrains.com/issue/",
-			"JT-36485",
-			"#comment=27-1508676",
-			"",
-		},
-	}
-
-	for k, v := range testCases {
-		assert.Equal(t, IssueFullPattern.FindStringSubmatch(k)[1:], v)
-	}
-}
-
 func TestMisc_IsMarkdownFile(t *testing.T) {
 	setting.Markdown.FileExtensions = []string{".md", ".markdown", ".mdown", ".mkd"}
 	trueTestCases := []string{
@@ -645,7 +619,7 @@ var sameCases = []string{
 
 Ideas and codes
 
-- Bezier widget (by @r-lyeh) https://github.com/ocornut/imgui/issues/786
+- Bezier widget (by @r-lyeh) ` + AppURL + `ocornut/imgui/issues/786
 - Node graph editors https://github.com/ocornut/imgui/issues/306
 - [[Memory Editor|memory_editor_example]]
 - [[Plot var helper|plot_var_example]]`,
@@ -681,8 +655,8 @@ func testAnswers(baseURLContent, baseURLImages string) []string {
 <p>Ideas and codes</p>
 
 <ul>
-<li>Bezier widget (by <a href="` + AppURL + `r-lyeh" rel="nofollow">@r-lyeh</a>)<a href="https://github.com/ocornut/imgui/issues/786" rel="nofollow">#786</a></li>
-<li>Node graph editors<a href="https://github.com/ocornut/imgui/issues/306" rel="nofollow">#306</a></li>
+<li>Bezier widget (by <a href="` + AppURL + `r-lyeh" rel="nofollow">@r-lyeh</a>) <a href="http://localhost:3000/ocornut/imgui/issues/786" rel="nofollow">#786</a></li>
+<li>Node graph editors https://github.com/ocornut/imgui/issues/306</li>
 <li><a href="` + baseURLContent + `/memory_editor_example" rel="nofollow">Memory Editor</a></li>
 <li><a href="` + baseURLContent + `/plot_var_example" rel="nofollow">Plot var helper</a></li>
 </ul>
diff --git a/routers/api/v1/misc/markdown_test.go b/routers/api/v1/misc/markdown_test.go
index 182b147820..d6e6193478 100644
--- a/routers/api/v1/misc/markdown_test.go
+++ b/routers/api/v1/misc/markdown_test.go
@@ -75,7 +75,7 @@ func TestAPI_RenderGFM(t *testing.T) {
 <ul>
 <li><a href="` + AppSubURL + `wiki/Links" rel="nofollow">Links, Language bindings, Engine bindings</a></li>
 <li><a href="` + AppSubURL + `wiki/Tips" rel="nofollow">Tips</a></li>
-<li>Bezier widget (by <a href="` + AppURL + `r-lyeh" rel="nofollow">@r-lyeh</a>)<a href="https://github.com/ocornut/imgui/issues/786" rel="nofollow">#786</a></li>
+<li>Bezier widget (by <a href="` + AppURL + `r-lyeh" rel="nofollow">@r-lyeh</a>) https://github.com/ocornut/imgui/issues/786</li>
 </ul>
 `,
 		// wine-staging wiki home extract: special wiki syntax, images
diff --git a/routers/init.go b/routers/init.go
index ad624d3b7a..bd46abdf94 100644
--- a/routers/init.go
+++ b/routers/init.go
@@ -50,6 +50,7 @@ func GlobalInit() {
 
 	if setting.InstallLock {
 		highlight.NewContext()
+		markdown.InitMarkdown()
 		markdown.NewSanitizer()
 		if err := models.NewEngine(migrations.Migrate); err != nil {
 			log.Fatal(4, "Failed to initialize ORM engine: %v", err)