Handle srcset images with no space after comma

reader/sanitizer/sanitizer.go

@@ -19,7 +19,7 @@ import (
 
 var (
 	youtubeEmbedRegex = regexp.MustCompile(`//www\.youtube\.com/embed/(.*)`)
-	splitSrcsetRegex  = regexp.MustCompile(`,\s+`)
+	splitSrcsetRegex  = regexp.MustCompile(`,\s?`)
 )
 
 // Sanitize returns safe HTML.
@@ -457,13 +457,9 @@ func sanitizeSrcsetAttr(baseURL, value string) string {
 		nbParts := len(parts)
 
 		if nbParts > 0 {
-			sanitizedSource := parts[0]
-			if !strings.HasPrefix(parts[0], "data:") {
-				var err error
-				sanitizedSource, err = url.AbsoluteURL(baseURL, parts[0])
-				if err != nil {
-					continue
-				}
+			sanitizedSource, err := url.AbsoluteURL(baseURL, parts[0])
+			if err != nil {
+				continue
 			}
 
 			if nbParts == 2 && isValidWidthOrDensityDescriptor(parts[1]) {

reader/sanitizer/sanitizer_test.go

@@ -45,9 +45,9 @@ func TestImgWithSrcset(t *testing.T) {
 	}
 }
 
-func TestImgWithSrcsetAndDataURL(t *testing.T) {
-	input := `<img srcset="data:image/gif;base64,test" src="http://example.org/example-320w.jpg" alt="Example">`
-	expected := `<img srcset="data:image/gif;base64,test" src="http://example.org/example-320w.jpg" alt="Example" loading="lazy">`
+func TestSourceWithSrcsetAndMedia(t *testing.T) {
+	input := `<picture><source media="(min-width: 800px)" srcset="elva-800w.jpg"></picture>`
+	expected := `<picture><source media="(min-width: 800px)" srcset="http://example.org/elva-800w.jpg"></picture>`
 	output := Sanitize("http://example.org/", input)
 
 	if output != expected {
@@ -55,9 +55,9 @@ func TestImgWithSrcsetAndDataURL(t *testing.T) {
 	}
 }
 
-func TestSourceWithSrcsetAndMedia(t *testing.T) {
-	input := `<picture><source media="(min-width: 800px)" srcset="elva-800w.jpg"></picture>`
-	expected := `<picture><source media="(min-width: 800px)" srcset="http://example.org/elva-800w.jpg"></picture>`
+func TestMediumImgWithSrcset(t *testing.T) {
+	input := `<img alt="Image for post" class="t u v ef aj" src="https://miro.medium.com/max/5460/1*aJ9JibWDqO81qMfNtqgqrw.jpeg" srcset="https://miro.medium.com/max/552/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 276w, https://miro.medium.com/max/1000/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 500w" sizes="500px" width="2730" height="3407">`
+	expected := `<img alt="Image for post" src="https://miro.medium.com/max/5460/1*aJ9JibWDqO81qMfNtqgqrw.jpeg" srcset="https://miro.medium.com/max/552/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 276w, https://miro.medium.com/max/1000/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 500w" sizes="500px" loading="lazy">`
 	output := Sanitize("http://example.org/", input)
 
 	if output != expected {
@@ -65,9 +65,9 @@ func TestSourceWithSrcsetAndMedia(t *testing.T) {
 	}
 }
 
-func TestMediumImgWithSrcset(t *testing.T) {
-	input := `<img alt="Image for post" class="t u v ef aj" src="https://miro.medium.com/max/5460/1*aJ9JibWDqO81qMfNtqgqrw.jpeg" srcset="https://miro.medium.com/max/552/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 276w, https://miro.medium.com/max/1000/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 500w" sizes="500px" width="2730" height="3407">`
-	expected := `<img alt="Image for post" src="https://miro.medium.com/max/5460/1*aJ9JibWDqO81qMfNtqgqrw.jpeg" srcset="https://miro.medium.com/max/552/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 276w, https://miro.medium.com/max/1000/1*aJ9JibWDqO81qMfNtqgqrw.jpeg 500w" sizes="500px" loading="lazy">`
+func TestEconomistImgWithSrcset(t *testing.T) {
+	input := `<img loading="lazy" src="https://www.economist.com/img/b/608/634/90/sites/default/files/images/print-edition/20211009_WWC585.png" srcSet="https://www.economist.com/img/b/200/209/90/sites/default/files/images/print-edition/20211009_WWC585.png 200w,https://www.economist.com/img/b/300/313/90/sites/default/files/images/print-edition/20211009_WWC585.png 300w,https://www.economist.com/img/b/400/417/90/sites/default/files/images/print-edition/20211009_WWC585.png 400w,https://www.economist.com/img/b/600/626/90/sites/default/files/images/print-edition/20211009_WWC585.png 600w,https://www.economist.com/img/b/640/667/90/sites/default/files/images/print-edition/20211009_WWC585.png 640w,https://www.economist.com/img/b/800/834/90/sites/default/files/images/print-edition/20211009_WWC585.png 800w,https://www.economist.com/img/b/1000/1043/90/sites/default/files/images/print-edition/20211009_WWC585.png 1000w,https://www.economist.com/img/b/1280/1335/90/sites/default/files/images/print-edition/20211009_WWC585.png 1280w" sizes="300px" alt=""/>`
+	expected := `<img src="https://www.economist.com/img/b/608/634/90/sites/default/files/images/print-edition/20211009_WWC585.png" srcset="https://www.economist.com/img/b/200/209/90/sites/default/files/images/print-edition/20211009_WWC585.png 200w, https://www.economist.com/img/b/300/313/90/sites/default/files/images/print-edition/20211009_WWC585.png 300w, https://www.economist.com/img/b/400/417/90/sites/default/files/images/print-edition/20211009_WWC585.png 400w, https://www.economist.com/img/b/600/626/90/sites/default/files/images/print-edition/20211009_WWC585.png 600w, https://www.economist.com/img/b/640/667/90/sites/default/files/images/print-edition/20211009_WWC585.png 640w, https://www.economist.com/img/b/800/834/90/sites/default/files/images/print-edition/20211009_WWC585.png 800w, https://www.economist.com/img/b/1000/1043/90/sites/default/files/images/print-edition/20211009_WWC585.png 1000w, https://www.economist.com/img/b/1280/1335/90/sites/default/files/images/print-edition/20211009_WWC585.png 1280w" sizes="300px" alt="" loading="lazy"/>`
 	output := Sanitize("http://example.org/", input)
 
 	if output != expected {