Pull out torrent validation into validator class

util/config/validators/validate_torrent.py

@@ -0,0 +1,53 @@
+import logging
+
+from hashlib import sha1
+
+from app import app
+from util.config.validators import BaseValidator, ConfigValidationException
+from util.registry.torrent import torrent_jwt
+
+logger = logging.getLogger(__name__)
+
+class BittorrentValidator(BaseValidator):
+  name = "bittorrent"
+
+  @classmethod
+  def validate(cls, config, user, user_password):
+    """ Validates the configuration for using BitTorrent for downloads. """
+    announce_url = config.get('BITTORRENT_ANNOUNCE_URL')
+    if not announce_url:
+      raise ConfigValidationException('Missing announce URL')
+
+    # Ensure that the tracker is reachable and accepts requests signed with a registry key.
+    client = app.config['HTTPCLIENT']
+
+    params = {
+      'info_hash': sha1('somedata').digest(),
+      'peer_id': '-QUAY00-6wfG2wk6wWLc',
+      'uploaded': 0,
+      'downloaded': 0,
+      'left': 0,
+      'numwant': 0,
+      'port': 80,
+    }
+
+    encoded_jwt = torrent_jwt(params)
+    params['jwt'] = encoded_jwt
+
+    resp = client.get(announce_url, timeout=5, params=params)
+    logger.debug('Got tracker response: %s: %s', resp.status_code, resp.text)
+
+    if resp.status_code == 404:
+      raise ConfigValidationException('Announce path not found; did you forget `/announce`?')
+
+    if resp.status_code == 500:
+      raise ConfigValidationException('Did not get expected response from Tracker; ' +
+                                      'please check your settings')
+
+    if resp.status_code == 200:
+      if 'invalid jwt' in resp.text:
+        raise ConfigValidationException('Could not authorize to Tracker; is your Tracker ' +
+                                        'properly configured?')
+
+      if 'failure reason' in resp.text:
+        raise ConfigValidationException('Could not validate signed announce request: ' + resp.text)