Edge case coverage

Cover edge cases that shouldn't ever happen but probably will sometime.

Also included Imgur changes to cover similar situations of malformed/redirected links.

bdfr/site_downloaders/download_factory.py

@@ -25,7 +25,7 @@ class DownloadFactory:
     @staticmethod
     def pull_lever(url: str) -> Type[BaseDownloader]:
         sanitised_url = DownloadFactory.sanitise_url(url)
-        if re.match(r'(i\.)?imgur.*\.gif.+$', sanitised_url):
+        if re.match(r'imgur\.com', sanitised_url):
             return Imgur
         elif re.match(r'(i\.)?(redgifs|gifdeliverynetwork)', sanitised_url):
             return Redgifs
@@ -40,8 +40,6 @@ class DownloadFactory:
             return Gallery
         elif re.match(r'gfycat\.', sanitised_url):
             return Gfycat
-        elif re.match(r'(m\.)?imgur.*', sanitised_url):
-            return Imgur
         elif re.match(r'reddit\.com/r/', sanitised_url):
             return SelfPost
         elif re.match(r'(m\.)?youtu\.?be', sanitised_url):

bdfr/site_downloaders/imgur.py

@@ -41,10 +41,11 @@ class Imgur(BaseDownloader):
 
     @staticmethod
     def _get_data(link: str) -> dict:
-        link = link.rstrip('?')
-        if re.match(r'(?i).*\.gif.+$', link):
-            link = link.replace('i.imgur', 'imgur')
-            link = re.sub('(?i)\\.gif.+$', '', link)
+        try:
+            imgur_id = re.match(r'.*/(.*?)(\..{0,})?$', link).group(1)
+            link = f'https://imgur.com/a/{imgur_id}'
+        except AttributeError:
+            raise SiteDownloaderError(f'Could not extract Imgur ID from {link}')
 
         res = Imgur.retrieve_url(link, cookies={'over18': '1', 'postpagebeta': '0'})
 

bdfr/site_downloaders/redgifs.py

@@ -24,7 +24,7 @@ class Redgifs(BaseDownloader):
     @staticmethod
     def _get_link(url: str) -> set[str]:
         try:
-            redgif_id = re.match(r'.*/(.*?)(\..{3,})?$', url).group(1)
+            redgif_id = re.match(r'.*/(.*?)(\..{0,})?$', url).group(1)
         except AttributeError:
             raise SiteDownloaderError(f'Could not extract Redgifs ID from {url}')