Privacy

devplacepy/rendering.py

@@ -69,6 +69,9 @@ _YOUTUBE_ALLOW = (
     "gyroscope; picture-in-picture"
 )
 
+_EMAIL_RE = re.compile(r"\b[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}\b")
+_EMAIL_KEEP_DOMAIN = "molodetz.nl"
+
 _MEDIA_SKIP_TAGS = {"a", "code", "pre"}
 _TITLE_INLINE_TAGS = {
     "b", "strong", "i", "em", "code", "del", "s", "mark", "sub", "sup", "span", "br",
@@ -153,12 +156,26 @@ def _embed_url(url: str) -> str:
     )
 
 
+def _mask_email(match: re.Match) -> str:
+    email = match.group(0)
+    local, _, domain = email.partition("@")
+    lowered = domain.lower()
+    if lowered == _EMAIL_KEEP_DOMAIN or lowered.endswith("." + _EMAIL_KEEP_DOMAIN):
+        return email
+    reveal = max(1, len(local) - round(len(local) * 0.8))
+    return f"{local[:reveal]}{'*' * (len(local) - reveal)}@{domain}"
+
+
+def _mask_emails(text: str) -> str:
+    return _EMAIL_RE.sub(_mask_email, text)
+
+
 def _transform_text(text: str) -> str:
     out: list[str] = []
     pos = 0
     for match in _TOKEN_RE.finditer(text):
         if match.start() > pos:
-            out.append(html.escape(text[pos:match.start()]))
+            out.append(html.escape(_mask_emails(text[pos:match.start()])))
         if match.group("url"):
             out.append(_embed_url(match.group("url")))
         else:
@@ -169,7 +186,7 @@ def _transform_text(text: str) -> str:
             )
         pos = match.end()
     if pos < len(text):
-        out.append(html.escape(text[pos:]))
+        out.append(html.escape(_mask_emails(text[pos:])))
     return "".join(out)
 
 
@@ -205,7 +222,7 @@ class _MediaProcessor(HTMLParser):
 
     def handle_data(self, data: str) -> None:
         if self._skip_depth > 0:
-            self._out.append(html.escape(data))
+            self._out.append(html.escape(_mask_emails(data)))
         else:
             self._out.append(_transform_text(data))
 
@@ -231,7 +248,7 @@ class _InlineFilter(HTMLParser):
             self._out.append(f"</{tag}>")
 
     def handle_data(self, data: str) -> None:
-        self._out.append(html.escape(data))
+        self._out.append(html.escape(_mask_emails(data)))
 
     def result(self) -> str:
         return "".join(self._out).strip()