fix(security): neutraliser le contexte des erreurs expurgées

pronote_sync/pipeline/steps/fetch.py

@@ -121,6 +121,7 @@ def fetch_step(
     :raises PronoteAuthRotationError: Si une rotation du token d'authentification
         pronotepy est nécessaire : propagée telle quelle jusqu'au pipeline.
     """
+    critical_error: PipelineCriticalError | None = None
     try:
         lessons, school_events = fetcher.fetch_agenda()
         target_date = resolve_target_date(today or date.today(), lessons, school_events)
@@ -130,9 +131,11 @@ def fetch_step(
     except PronoteAuthRotationError:
         raise
     except Exception as exc:
-        raise PipelineCriticalError(
+        critical_error = PipelineCriticalError(
             f"Récupération Pronote impossible : {redact_exception(exc)}", step="fetch"
-        ) from None
+        )
+    if critical_error is not None:
+        raise critical_error from None
 
     messages, warnings = _fetch_optional_messages(fetcher)
     return (

pronote_sync/pipeline/steps/fetch_blog.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from pronote_sync.sources.blog.result import BlogRSSFetchResult
 from pronote_sync.sources.blog.rss import BlogRSSClient
 from pronote_sync.sources.blog.state import BlogRSSState
-from pronote_sync.utils.redaction import redact_exception
+from pronote_sync.utils.redaction import redact_exception, redact_secrets
 
 
 def fetch_blog_step(client: BlogRSSClient | None, state: BlogRSSState | None) -> BlogRSSFetchResult:
@@ -24,15 +24,18 @@ def fetch_blog_step(client: BlogRSSClient | None, state: BlogRSSState | None) ->
     """
     if client is None or state is None:
         return BlogRSSFetchResult()
+    error_message: str | None = None
     try:
         etag, last_modified = state.get_cache_headers()
         result = client.fetch_and_parse(
             known_guids=state.get_known_guids(), etag=etag, last_modified=last_modified
         )
         if result.error is not None:
-            raise RuntimeError(result.error) from None
-        if not result.not_modified and not result.articles:
+            error_message = f"Récupération du blog échouée : {redact_secrets(result.error)}"
+        elif not result.not_modified and not result.articles:
             state.update_cache_headers(result.etag, result.last_modified)
-        return result
     except Exception as exc:
-        raise RuntimeError(f"Récupération du blog échouée : {redact_exception(exc)}") from None
+        error_message = f"Récupération du blog échouée : {redact_exception(exc)}"
+    if error_message is not None:
+        raise RuntimeError(error_message) from None
+    return result