linkcheck: Check the source URL of raw directives

Add raw directives' source URL to the list of links to check with linkcheck.
By the way, refactor HyperlinkCollector by adding `add_uri` function.
Add test for linkcheck raw directives source URL

CHANGES

@@ -15,6 +15,8 @@ Features added
 
 - #10286: C++, support requires clauses not just between the template
   parameter lists and the declaration.
+- #10755: linkcheck: Check the source URL of raw directives that use the ``url``
+  option.
 
 Bugs fixed
 ----------

sphinx/builders/linkcheck.py

@@ -502,32 +502,34 @@ class HyperlinkCollector(SphinxPostTransform):
         builder = cast(CheckExternalLinksBuilder, self.app.builder)
         hyperlinks = builder.hyperlinks
 
+        def add_uri(uri: str, node: nodes.Element) -> None:
+            newuri = self.app.emit_firstresult('linkcheck-process-uri', uri)
+            if newuri:
+                uri = newuri
+
+            lineno = get_node_line(node)
+            uri_info = Hyperlink(uri, self.env.docname, lineno)
+            if uri not in hyperlinks:
+                hyperlinks[uri] = uri_info
+
         # reference nodes
         for refnode in self.document.findall(nodes.reference):
             if 'refuri' not in refnode:
                 continue
             uri = refnode['refuri']
-            newuri = self.app.emit_firstresult('linkcheck-process-uri', uri)
-            if newuri:
-                uri = newuri
-
-            lineno = get_node_line(refnode)
-            uri_info = Hyperlink(uri, self.env.docname, lineno)
-            if uri not in hyperlinks:
-                hyperlinks[uri] = uri_info
+            add_uri(uri, refnode)
 
         # image nodes
         for imgnode in self.document.findall(nodes.image):
             uri = imgnode['candidates'].get('?')
             if uri and '://' in uri:
-                newuri = self.app.emit_firstresult('linkcheck-process-uri', uri)
-                if newuri:
-                    uri = newuri
+                add_uri(uri, imgnode)
 
-                lineno = get_node_line(imgnode)
-                uri_info = Hyperlink(uri, self.env.docname, lineno)
-                if uri not in hyperlinks:
-                    hyperlinks[uri] = uri_info
+        # raw nodes
+        for rawnode in self.document.findall(nodes.raw):
+            uri = rawnode.get('source')
+            if uri and '://' in uri:
+                add_uri(uri, rawnode)
 
 
 def rewrite_github_anchor(app: Sphinx, uri: str) -> Optional[str]:

tests/roots/test-linkcheck/links.txt

@@ -17,3 +17,6 @@ Some additional anchors to exercise ignore code
 
 .. image:: https://www.google.com/image.png
 .. figure:: https://www.google.com/image2.png
+
+.. raw:: html
+   :url: https://www.sphinx-doc.org/

tests/test_build_linkcheck.py

@@ -41,7 +41,7 @@ def test_defaults(app):
     assert "Not Found for url: https://www.google.com/image2.png" in content
     # looking for local file should fail
     assert "[broken] path/to/notfound" in content
-    assert len(content.splitlines()) == 6
+    assert len(content.splitlines()) == 7
 
 
 @pytest.mark.sphinx('linkcheck', testroot='linkcheck', freshenv=True)
@@ -58,8 +58,8 @@ def test_defaults_json(app):
                  "info"]:
         assert attr in row
 
-    assert len(content.splitlines()) == 11
-    assert len(rows) == 11
+    assert len(content.splitlines()) == 12
+    assert len(rows) == 12
     # the output order of the rows is not stable
     # due to possible variance in network latency
     rowsby = {row["uri"]: row for row in rows}
@@ -80,7 +80,7 @@ def test_defaults_json(app):
     assert dnerow['uri'] == 'https://localhost:7777/doesnotexist'
     assert rowsby['https://www.google.com/image2.png'] == {
         'filename': 'links.txt',
-        'lineno': 19,
+        'lineno': 20,
         'status': 'broken',
         'code': 0,
         'uri': 'https://www.google.com/image2.png',
@@ -94,6 +94,15 @@ def test_defaults_json(app):
     # images should fail
     assert "Not Found for url: https://www.google.com/image.png" in \
         rowsby["https://www.google.com/image.png"]["info"]
+    # raw nodes' url should be checked too
+    assert rowsby["https://www.sphinx-doc.org/"] == {
+        'filename': 'links.txt',
+        'lineno': 21,
+        'status': 'redirected',
+        'code': 302,
+        'uri': 'https://www.sphinx-doc.org/',
+        'info': 'https://www.sphinx-doc.org/en/master/'
+    }
 
 
 @pytest.mark.sphinx(
@@ -102,6 +111,7 @@ def test_defaults_json(app):
                    'linkcheck_ignore': [
                        'https://localhost:7777/doesnotexist',
                        'http://www.sphinx-doc.org/en/master/index.html#',
+                       'https://www.sphinx-doc.org/',
                        'https://www.google.com/image.png',
                        'https://www.google.com/image2.png',
                        'path/to/notfound']