From eae7d1f7a7b67d822615921dd69c4b35471733df Mon Sep 17 00:00:00 2001
From: Nikeron <6773262+Nikeron@users.noreply.github.com>
Date: Mon, 27 Aug 2018 01:48:18 +0400
Subject: [PATCH] Add data urls support for markdown images

---
 pkg/markup/markup.go    | 6 ++++++
 pkg/markup/sanitizer.go | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/pkg/markup/markup.go b/pkg/markup/markup.go
index 2d571489a..ee91b7b19 100644
--- a/pkg/markup/markup.go
+++ b/pkg/markup/markup.go
@@ -190,6 +190,12 @@ func wrapImgWithLink(urlPrefix string, buf *bytes.Buffer, token html.Token) {
 		return
 	}
 
+	// Skip in case the "src" is data url
+	if strings.HasPrefix(src, "data:") {
+		buf.WriteString(token.String())
+		return
+	}
+
 	// Prepend repository base URL for internal links
 	needPrepend := !isLink([]byte(src))
 	if needPrepend {
diff --git a/pkg/markup/sanitizer.go b/pkg/markup/sanitizer.go
index 371f5b3f6..3f1e41b7e 100644
--- a/pkg/markup/sanitizer.go
+++ b/pkg/markup/sanitizer.go
@@ -36,6 +36,9 @@ func NewSanitizer() {
 		sanitizer.policy.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).OnElements("input")
 		sanitizer.policy.AllowAttrs("checked", "disabled").OnElements("input")
 
+		// Data URLs
+		sanitizer.policy.AllowURLSchemes("data")
+
 		// Custom URL-Schemes
 		sanitizer.policy.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
 	})