embed.sanitizer: add proxify function

litecord/embed/sanitizer.py

@@ -5,6 +5,7 @@ litecord.embed.sanitizer
 """
 from typing import Dict, Any
 from logbook import Logger
+from quart import current_app as app
 
 log = Logger(__name__)
 Embed = Dict[str, Any]
@@ -53,21 +54,35 @@ def path_exists(embed: Embed, components: str):
     return False
 
 
+def proxify(url) -> str:
+    """Return a mediaproxy url for the given EmbedURL."""
+
+    md_base_url = app.config.MEDIA_PROXY
+    parsed = url.parsed
+    proto = 'https' if app.config.IS_SSL else 'http'
+
+    return (
+        # base mediaproxy url
+        f'{proto}://{md_base_url}/img/'
+        f'{parsed.scheme}/{parsed.netloc}/{parsed.path}'
+    )
+
+
 async def fill_embed(embed: Embed) -> Embed:
     """Fill an embed with more information."""
     embed = sanitize_embed(embed)
 
     if path_exists(embed, 'footer.icon_url'):
-        # TODO: make proxy_icon_url
-        log.warning('embed with footer.icon_url, ignoring')
-
-    if path_exists(embed, 'image.url'):
-        # TODO: make proxy_icon_url, width, height
-        log.warning('embed with footer.image_url, ignoring')
+        embed['footer']['proxy_icon_url'] = \
+            proxify(embed['footer']['icon_url'])
 
     if path_exists(embed, 'author.icon_url'):
-        # TODO: should we check icon_url and convert it into
-        # a proxied icon url?
-        log.warning('embed with author.icon_url, ignoring')
+        embed['author']['proxy_icon_url'] = \
+            proxify(embed['author']['icon_url'])
+
+    if path_exists(embed, 'image.url'):
+        # TODO: width, height
+        embed['image']['proxy_url'] = \
+            proxify(embed['image']['url'])
 
     return embed

litecord/embed/schemas.py

@@ -54,6 +54,8 @@ EMBED_AUTHOR = {
     'icon_url': {
         'coerce': EmbedURL, 'required': False,
     }
+
+    # NOTE: proxy_icon_url set by us
 }
 
 EMBED_FIELD = {