thumbnail: Remove unused is_camo_url parameter.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

stubs/taint/false_positives.pysa

@@ -9,7 +9,6 @@ def zerver.views.auth.get_safe_redirect_to(url, redirect_host) -> Sanitize: ...
 def zerver.lib.thumbnail.generate_thumbnail_url(
     path,
     size=...,
-    is_camo_url=...
 ) -> Sanitize: ...
 
 # This function returns a version of name that only contains word and space

zerver/lib/thumbnail.py

@@ -17,7 +17,7 @@ def user_uploads_or_external(url: str) -> bool:
     )
 
 
-def generate_thumbnail_url(path: str, size: str = "0x0", is_camo_url: bool = False) -> str:
+def generate_thumbnail_url(path: str, size: str = "0x0") -> str:
     path = urljoin("/", path)
 
     if url_has_allowed_host_and_scheme(path, allowed_hosts=None):

zerver/views/development/camo.py

@@ -8,6 +8,6 @@ from zerver.lib.thumbnail import generate_thumbnail_url
 def handle_camo_url(request: HttpRequest, digest: str, received_url: str) -> HttpResponse:
     original_url = bytes.fromhex(received_url).decode()
     if is_camo_url_valid(digest, original_url):
-        return redirect(generate_thumbnail_url(original_url, is_camo_url=True))
+        return redirect(generate_thumbnail_url(original_url))
     else:
         return HttpResponseForbidden("<p>Not a valid URL.</p>")