feat(parsing.utils): add JSON Feed support

feedparser@develop has added support for JSON Feed before. However,
entry.content maybe a bare dict this time, unlike Atom that use an array
(list) of dicts.

Add JSON Feed support by adding a case that deals with such behavior.
With this patch and feedparser from its develop branch, we can finally
gain the support for JSON Feed.

See also #273.

Signed-off-by: Rongrong <[email protected]>

src/parsing/utils.py

@@ -258,8 +258,8 @@ class EntryParsed:
         enclosures: list[Enclosure] = None
 
     content = (
-            entry.get('content')  # Atom
-            or entry.get('summary', '')  # Atom summary or RSS description
+            entry.get('content')  # Atom: <content>; JSON Feed: .content_html, .content_text
+            or entry.get('summary', '')  # Atom: <summary>; RSS: <description>
     )
 
     if isinstance(content, list) and len(content) > 0:  # Atom
@@ -271,6 +271,9 @@ class EntryParsed:
         else:
             content = content[0]
         content = content.get('value', '')
+    elif isinstance(content, dict):  # JSON Feed
+        # TODO: currently feedparser always prefer content_text rather than content_html, we'd like to change that
+        content = content.get('value', '')
 
     EntryParsed.content = await html_validator(content)
     EntryParsed.link = entry.get('link') or entry.get('guid')