support excluding specific routes

app.py

@@ -16,17 +16,22 @@ from aiohttp import web
 import pytomlpp as toml
 from utils import build_dprint, ContextVar
 
-with open(sys.argv[1] if len(sys.argv) > 1 else 'config.toml') as f:
+def load_config():
+	with open(sys.argv[1] if len(sys.argv) > 1 else 'config.toml') as f:
 		config = toml.load(f)
 
-for host in config['hosts'].values():
+	for host in config['hosts'].values():
 		if not host.setdefault('replace', True): continue
 		host['pattern_decoded'] = host['pattern']
 		host['pattern'] = re.compile(host['pattern'].encode())
 		host['repl_decoded'] = host['repl']
 		host['repl'] = host['repl'].encode()
-	host['mime_types'] = frozenset(host.get('mime_types', ()))
+		host['mime_types'] = frozenset(host.get('excluded_routes', ()))
+		host['excluded_routes'].sort(key=len, reverse=True)
 
+	return config
+
+config = load_config()
 dprint = build_dprint(config.get('debug'))
 http = ContextVar('http')
 
@@ -52,6 +57,10 @@ async def handler(request):
 		if not hconfig['replace']:
 			print('Not replacing for this host')
 			return await proxy_passthrough(upstream_resp, resp)
+		for excluded_route in hconfig['excluded_routes']:
+			if request.path.startswith(excluded_route):
+				print('Not replacing for', excluded_route)
+				return await proxy_passthrough(upstream_resp, resp)
 		if hconfig['mime_types'] and upstream_resp.content_type not in hconfig['mime_types']:
 			print('Not configured to replace for MIME type', upstream_resp.content_type)
 			return await proxy_passthrough(upstream_resp, resp)

config.example.toml

@@ -15,6 +15,8 @@ pattern = 'foo'
 repl = 'bar'
 # which mime types to replace for. defaults to all mime types.
 mime_types = ['text/html', 'application/json', 'application/activity+json', 'application/ld+json']
+# path prefixes not to replace for. these are applied in descending order of length.
+excluded_routes = ['/.well-known/', '/user/']
 
 # just pass through site2.example unmodified
 [hosts."site2.example"]