add explicit proxy support (#76)

- '--proxy' as command-line argument
- 'extractor.*.proxy' as config option

CHANGELOG.md

@@ -1,7 +1,9 @@
 # Changelog
 
 ## Unreleased
-- Fixed extraction issues for `mangastream` and `pixiv`
+- Added `--proxy` to explicitly specify a proxy server ([#76](https://github.com/mikf/gallery-dl/issues/76))
+- Fixed ugoira extraction for `pixiv` ([#78](https://github.com/mikf/gallery-dl/issues/78))
+- Fixed miscellaneous extraction issues for `mangastream`
 
 ## 1.2.0 - 2018-02-16
 - Added support for:

docs/configuration.rst

@@ -331,6 +331,36 @@ Description Source to read additional cookies from.
 =========== =====
 
 
+extractor.*.proxy
+-----------------
+=========== =====
+Type        ``string`` or ``object``
+Default     ``null``
+Description Proxy (or proxies) to be used for remote connections.
+
+            * If this is a ``string``, it is the proxy URL for all
+              outgoing requests.
+            * If this is an ``object``, it is a scheme-to-proxy mapping to
+              specify different proxy URLs for each scheme.
+              It is also possible to set a proxy for a specific host by using
+              ``scheme://host`` as key.
+              See `Requests' proxy documentation`_ for more details.
+
+              Example:
+
+              .. code::
+
+                {
+                    "http": "http://10.10.1.10:3128",
+                    "https": "http://10.10.1.10:1080",
+                    "http://10.20.1.128": "http://10.10.1.10:5323"
+                }
+
+            Note that all proxy URLs should include a scheme,
+            otherwise ``http://`` is assumed.
+=========== =====
+
+
 extractor.*.user-agent
 ----------------------
 =========== =====
@@ -348,7 +378,7 @@ extractor.*.keywords
 --------------------
 =========== =====
 Type        ``object``
-Example    ``{"type": "Pixel Art", "type_id": 123}``
+Example     ``{"type": "Pixel Art", "type_id": 123}``
 Description Additional key-value pairs to be added to each metadata dictionary.
 =========== =====
 
@@ -811,6 +841,7 @@ How To      - login and visit Tumblr's Applications_ section
 .. _requests.request(): https://docs.python-requests.org/en/master/api/#requests.request
 .. _timeout:           https://docs.python-requests.org/en/latest/user/advanced/#timeouts
 .. _verify:            https://docs.python-requests.org/en/master/user/advanced/#ssl-cert-verification
+.. _`Requests' proxy documentation`: http://docs.python-requests.org/en/master/user/advanced/#proxies
 .. _format string:     https://docs.python.org/3/library/string.html#formatstrings
 .. _format strings:    https://docs.python.org/3/library/string.html#formatstrings
 .. _strptime:          https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior

docs/gallery-dl.conf

@@ -17,6 +17,7 @@
     "extractor":
     {
         "archive": null,
+        "proxy": null,
         "skip": true,
         "sleep": 0,
 

gallery_dl/extractor/common.py

@@ -34,8 +34,9 @@ class Extractor():
     def __init__(self):
         self.session = requests.Session()
         self.log = logging.getLogger(self.category)
-        self._set_cookies(self.config("cookies"))
         self._set_headers()
+        self._set_cookies()
+        self._set_proxies()
 
     def __iter__(self):
         return self.items()
@@ -105,8 +106,9 @@ class Extractor():
             "user-agent", ("Mozilla/5.0 (X11; Linux x86_64; rv:54.0) "
                            "Gecko/20100101 Firefox/54.0"))
 
-    def _set_cookies(self, cookies):
-        """Populate the cookiejar with 'cookies'"""
+    def _set_cookies(self):
+        """Populate the session's cookiejar"""
+        cookies = self.config("cookies")
         if cookies:
             if isinstance(cookies, dict):
                 setcookie = self.session.cookies.set
@@ -120,6 +122,20 @@ class Extractor():
                 except OSError as exc:
                     self.log.warning("cookies: %s", exc)
 
+    def _set_proxies(self):
+        """Update the session's proxy map"""
+        proxies = self.config("proxy")
+        if proxies:
+            if isinstance(proxies, str):
+                proxies = {"http": proxies, "https": proxies}
+            if isinstance(proxies, dict):
+                for scheme, proxy in proxies.items():
+                    if "://" not in proxy:
+                        proxies[scheme] = "http://" + proxy.lstrip("/")
+                self.session.proxies = proxies
+            else:
+                self.log.warning("invalid proxy specifier: %s", proxies)
+
     def _check_cookies(self, cookienames, domain=None):
         """Check if all 'cookienames' are in the session's cookiejar"""
         if not domain and self.cookiedomain:

gallery_dl/option.py

@@ -88,6 +88,11 @@ def build_parser():
         metavar="FILE", action=ConfigAction, dest="cookies",
         help="File to load additional cookies from",
     )
+    general.add_argument(
+        "--proxy",
+        metavar="URL", action=ConfigAction, dest="proxy",
+        help="Use the specified proxy",
+    )
 
     output = parser.add_argument_group("Output Options")
     output.add_argument(