[ENH] Proxy support for add-on installation

Orange/canvas/application/addons.py

@@ -15,6 +15,8 @@
 from xml.sax.saxutils import escape
 from distutils import version
 from email.parser import HeaderParser
+import urllib.request
+import xmlrpc.client
 
 import pkg_resources
 
@@ -629,14 +631,26 @@ def __on_installer_finished(self):
         self.accept()
 
 
+class SafeUrllibTransport(xmlrpc.client.Transport):
+    """Urllib for HTTPS connections that automatically handles proxies."""
+
+    def single_request(self, host, handler, request_body, verbose=False):
+        req = urllib.request.Request('https://%s%s' % (host, handler), request_body)
+        req.add_header('User-agent', self.user_agent)
+        req.add_header('Content-Type', 'text/xml')
+        self.verbose = verbose
+        opener = urllib.request.build_opener()
+        return self.parse_response(opener.open(req))
+
+
 def list_pypi_addons():
     """
     List add-ons available on pypi.
     """
     from ..config import ADDON_PYPI_SEARCH_SPEC
-    import xmlrpc.client
+
     pypi = xmlrpc.client.ServerProxy(
-        "https://pypi.python.org/pypi",
+        "https://pypi.python.org/pypi/",
         transport=xmlrpc.client.SafeTransport()
     )
     addons = pypi.search(ADDON_PYPI_SEARCH_SPEC)
@@ -701,6 +715,20 @@ def observed(el):
     return (el for el in iterable if not observed(el))
 
 
+def _env_with_proxies():
+    """
+    Return system environment with proxies obtained from urllib so that
+    they can be used with pip.
+    """
+    proxies = urllib.request.getproxies()
+    env = dict(os.environ)
+    if "http" in proxies:
+        env["HTTP_PROXY"] = proxies["http"]
+    if "https" in proxies:
+        env["HTTPS_PROXY"] = proxies["https"]
+    return env
+
+
 Install, Upgrade, Uninstall = 1, 2, 3
 
 
@@ -740,7 +768,7 @@ def fmt_cmd(cmd):
             cmd = (["-m", "pip", "install"] +
                    (["--user"] if self.__user_install else []) +
                    [inst_name])
-            process = python_process(cmd, bufsize=-1, universal_newlines=True)
+            process = python_process(cmd, bufsize=-1, universal_newlines=True, env=_env_with_proxies())
             retcode, output = self.__subprocessrun(process)
 
             if retcode != 0:
@@ -755,7 +783,7 @@ def fmt_cmd(cmd):
             cmd = (["-m", "pip", "install", "--upgrade", "--no-deps"] +
                    (["--user"] if self.__user_install else []) +
                    [inst_name])
-            process = python_process(cmd, bufsize=-1, universal_newlines=True)
+            process = python_process(cmd, bufsize=-1, universal_newlines=True, env=_env_with_proxies())
             retcode, output = self.__subprocessrun(process)
 
             if retcode != 0:
@@ -766,7 +794,7 @@ def fmt_cmd(cmd):
             cmd = (["-m", "pip", "install"] +
                    (["--user"] if self.__user_install else []) +
                    [inst_name])
-            process = python_process(cmd, bufsize=-1, universal_newlines=True)
+            process = python_process(cmd, bufsize=-1, universal_newlines=True, env=_env_with_proxies())
             retcode, output = self.__subprocessrun(process)
 
             if retcode != 0:
@@ -778,7 +806,7 @@ def fmt_cmd(cmd):
             self.setStatusMessage("Uninstalling {}".format(dist.project_name))
 
             cmd = ["-m", "pip", "uninstall", "--yes", dist.project_name]
-            process = python_process(cmd, bufsize=-1, universal_newlines=True)
+            process = python_process(cmd, bufsize=-1, universal_newlines=True, env=_env_with_proxies())
             retcode, output = self.__subprocessrun(process)
 
             if self.__user_install: