camo: Add endpoint to handle camo requests.

This endpoint serves requests which might originate from an image
preview link which had an http url and the message holding the image
link was rendered before we introduced thumbnailing. In that case
we would have used a camo proxy to proxy http content over https and
avoid mix content warnings.

In near future, we plan to drop use of camo and just rely on thumbor
to serve such images. This endpoint helps maintain backward
compatibility for links which were already rendered.

zerver/lib/thumbnail.py

@@ -30,7 +30,9 @@ def get_source_type(url: str) -> str:
         return THUMBOR_LOCAL_FILE_TYPE
     return THUMBOR_S3_TYPE
 
-def generate_thumbnail_url(path: str, size: str='0x0') -> str:
+def generate_thumbnail_url(path: str,
+                           size: str='0x0',
+                           is_camo_url: bool=False) -> str:
     if not (path.startswith('https://') or path.startswith('http://')):
         path = '/' + path
 
@@ -48,14 +50,18 @@ def generate_thumbnail_url(path: str, size: str='0x0') -> str:
     width, height = map(int, size.split('x'))
     crypto = CryptoURL(key=settings.THUMBOR_KEY)
 
+    smart_crop_enabled = True
     apply_filters = ['no_upscale()']
+    if is_camo_url:
+        smart_crop_enabled = False
+        apply_filters.append('quality(100)')
     if size != '0x0':
         apply_filters.append('sharpen(0.5,0.2,true)')
 
     encrypted_url = crypto.generate(
         width=width,
         height=height,
-        smart=True,
+        smart=smart_crop_enabled,
         filters=apply_filters,
         image_url=image_url
     )