Method _key_from_url() now returns case sensitive results for special domains (e.g. imgur.com, youtube.com). They are defined as case_sensitive_domains in the .ini file

r2/example.ini

@@ -375,6 +375,9 @@ share_reply = noreply@reddit.com
 # feedback email 
 feedback_email = reddit@gmail.com
 
+# Special case sensitive domains
+case_sensitive_domains = i.imgur.com, youtube.com
+
 [server:main]
 use = egg:Paste#http
 host = 0.0.0.0

r2/r2/lib/app_globals.py

@@ -110,7 +110,8 @@ class Globals(object):
                    'authorized_cnames',
                    'hardcache_categories',
                    'proxy_addr',
-                   'allowed_pay_countries']
+                   'allowed_pay_countries',
+                   'case_sensitive_domains']
 
     choice_props = {'cassandra_rcl': {'ONE':    CL_ONE,
                                       'QUORUM': CL_QUORUM},

r2/r2/models/link.py

@@ -538,7 +538,13 @@ class LinksByUrl(tdb_cassandra.View):
 
     @classmethod
     def _key_from_url(cls, url):
-        keyurl = _force_utf8(UrlParser.base_url(url.lower()))
+        if not utils.domain(url) in g.case_sensitive_domains:
+            keyurl = _force_utf8(UrlParser.base_url(url.lower()))
+        else:
+            # Convert only hostname to lowercase
+            up = UrlParser(url)
+            up.hostname = up.hostname.lower()
+            keyurl = _force_utf8(UrlParser.base_url(up.unparse()))
         return keyurl
 
 # Note that there are no instances of PromotedLink or LinkCompressed,