Allow to replace URL dynamically (for Nitter, Teddit...)

app/ap_object.py

@@ -2,6 +2,7 @@ import hashlib
 from datetime import datetime
 from functools import cached_property
 from typing import Any
+from urllib.parse import urlparse
 
 import pydantic
 from bs4 import BeautifulSoup  # type: ignore
@@ -11,6 +12,7 @@ from app import activitypub as ap
 from app.actor import LOCAL_ACTOR
 from app.actor import Actor
 from app.actor import RemoteActor
+from app.config import PRIVACY_REPLACE
 from app.media import proxied_media_url
 from app.utils.datetime import now
 from app.utils.datetime import parse_isoformat
@@ -175,9 +177,22 @@ class Object:
 
         # PeerTube returns the content as markdown
         if self.ap_object.get("mediaType") == "text/markdown":
-            return markdown(content, extensions=["mdx_linkify"])
+            content = markdown(content, extensions=["mdx_linkify"])
 
-        return content
+        if not PRIVACY_REPLACE:
+            return content
+
+        soup = BeautifulSoup(content, "html5lib")
+        links = soup.find_all("a", href=True)
+
+        for link in links:
+            parsed_href = urlparse(link.attrs["href"])
+            if new_netloc := PRIVACY_REPLACE.get(
+                parsed_href.netloc.removeprefix("www.")
+            ):
+                link.attrs["href"] = parsed_href._replace(netloc=new_netloc).geturl()
+
+        return soup.find("body").decode_contents()
 
     @property
     def summary(self) -> str | None: