utils: Add basic format proxy helper

mopidy/utils/http.py

@@ -0,0 +1,25 @@
+from __future__ import unicode_literals
+
+
+def format_proxy(proxy_config):
+    """Convert a Mopidy proxy config to the commonly used proxy string format.
+
+    Outputs ``scheme://host:port``, ``scheme://user:pass@host:port`` or
+    :class:`None` depending on the proxy config provided.
+    """
+    if not proxy_config.get('hostname'):
+        return None
+
+    if proxy_config.get('username') and proxy_config.get('password'):
+        template = '{scheme}://{username}:{password}@{hostname}:{port}'
+    else:
+        template = '{scheme}://{hostname}:{port}'
+
+    port = proxy_config.get('port', 80)
+    if port < 0:
+        port = 80
+
+    return template.format(scheme=proxy_config.get('scheme', 'http'),
+                           username=proxy_config.get('username'),
+                           password=proxy_config.get('password'),
+                           hostname=proxy_config['hostname'], port=port)

tests/utils/test_http.py

@@ -0,0 +1,20 @@
+from __future__ import unicode_literals
+
+import pytest
+
+from mopidy.utils import http
+
+
+@pytest.mark.parametrize("config,expected", [
+    ({}, None),
+    ({'hostname': 'proxy.lan'}, 'http://proxy.lan:80'),
+    ({'scheme': 'https', 'hostname': 'proxy.lan'}, 'https://proxy.lan:80'),
+    ({'username': 'user', 'hostname': 'proxy.lan'}, 'http://proxy.lan:80'),
+    ({'password': 'pass', 'hostname': 'proxy.lan'}, 'http://proxy.lan:80'),
+    ({'hostname': 'proxy.lan', 'port': 8080}, 'http://proxy.lan:8080'),
+    ({'hostname': 'proxy.lan', 'port': -1}, 'http://proxy.lan:80'),
+    ({'username': 'user', 'password': 'pass', 'hostname': 'proxy.lan'},
+     'http://user:pass@proxy.lan:80'),
+])
+def test_format_proxy(config, expected):
+    assert http.format_proxy(config) == expected