Adding blacklist version

README.md

@@ -1,6 +1,6 @@
 # CustomMedia
 
-A fork of [Plan9's CustomMedia project](https://gitea.plan9.rocks/cat/CustomMedia) that adds a whitelist-based version for choosing specific homeservers to pull media from directly. Conserve your matrix homeserver's precious storage space and bandwidth with this one simple webserver.
+A fork of [Plan9's CustomMedia project](https://gitea.plan9.rocks/cat/CustomMedia) that adds whitelist and blacklist versions for choosing specific homeservers to pull media from directly. Conserve your matrix homeserver's precious storage space and bandwidth with this one simple webserver.
 
 # Requirements
 - Python 3

blacklist.txt

@@ -0,0 +1 @@
+example.com

custommedia-blacklist.py

@@ -0,0 +1,75 @@
+#!/usr/bin/python3
+import urllib.request
+import json
+
+headers = {
+    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36'
+}
+
+class MyServer:
+    def __init__(self, environ, start_response):
+        self.environ = environ
+        self.start_response = start_response
+        self.mapping_file = 'mapping.json'
+        self.mappings = self.load_mappings()
+        self.default_hs = "https://matrix-client.matrix.org"
+        self.blacklist = set(line.strip() for line in open('blacklist.txt'))
+
+    def __iter__(self):
+        hs = self.environ['PATH_INFO'].split('/')[5]
+
+        if not hs in self.blacklist:
+            hsu = self.mappings.get(hs)
+
+            if not hsu:
+                wellknown = "https://" + hs + "/.well-known/matrix/client"
+                req = urllib.request.Request(wellknown, headers=headers)
+                try:
+                    with urllib.request.urlopen(req, timeout=2) as cont:
+                        hsu = json.load(cont)
+                        hsu = hsu["m.homeserver"]["base_url"].rstrip('/')
+                        self.mappings[hs] = hsu
+                        self.save_mappings()
+                except Exception as e: # I don't care to fix this properly, not my problem
+                    hsu = self.default_hs
+        else:
+            hsu = self.default_hs
+
+        hsp = hsu + self.environ['PATH_INFO'] + '?' + self.environ['QUERY_STRING']
+        self.start_response('301 Moved Permanently', [('Location', hsp)])
+        return iter([])
+
+    def load_mappings(self):
+        try:
+            with open(self.mapping_file, 'r') as f:
+                return json.load(f)
+        except (FileNotFoundError, json.JSONDecodeError):
+            return {}
+
+    def save_mappings(self):
+        with open(self.mapping_file, 'w') as f:
+            json.dump(self.mappings, f)
+
+if __name__ == "__main__":
+    from gunicorn.app.base import BaseApplication
+
+    class GunicornServer(BaseApplication):
+        def __init__(self, app, options=None):
+            self.options = options or {}
+            self.application = app
+            super().__init__()
+
+        def load_config(self):
+            for key, value in self.options.items():
+                self.cfg.set(key, value)
+
+        def load(self):
+            return self.application
+
+    options = {
+        'bind': 'localhost:9999',
+        'workers': 48,  # Adjust the number of workers based on your system's resources - ChatGPT
+    }
+
+    server = GunicornServer(MyServer, options)
+    server.run()