[gfycat] implement login support (#3770, #4271)

For the record: '/webtoken' and '/weblogin' are not the same ...

docs/configuration.rst

@@ -382,6 +382,7 @@ Description
     * ``e621`` (*)
     * ``e926`` (*)
     * ``exhentai``
+    * ``gfycat``
     * ``idolcomplex``
     * ``imgbb``
     * ``inkbunny``

docs/supportedsites.md

@@ -251,7 +251,7 @@ Consider all sites to be NSFW unless otherwise known.
     <td>Gfycat</td>
     <td>https://gfycat.com/</td>
     <td>Collections, individual Images, Search Results, User Profiles</td>
-    <td></td>
+    <td>Supported</td>
 </tr>
 <tr>
     <td>Gofile</td>

gallery_dl/extractor/gfycat.py

@@ -10,6 +10,7 @@
 
 from .common import Extractor, Message
 from .. import text, exception
+from ..cache import cache
 
 
 class GfycatExtractor(Extractor):
@@ -221,6 +222,8 @@ class GfycatAPI():
 
     def __init__(self, extractor):
         self.extractor = extractor
+        self.headers = {}
+        self.username, self.password = extractor._get_auth_info()
 
     def collection(self, user, collection):
         endpoint = "/v1/users/{}/collections/{}/gfycats".format(
@@ -252,9 +255,45 @@ class GfycatAPI():
         params = {"count": 100}
         return self._pagination(endpoint, params)
 
+    def authenticate(self):
+        self.headers["Authorization"] = \
+            self._authenticate_impl(self.username, self.password)
+
+    @cache(maxage=3600, keyarg=1)
+    def _authenticate_impl(self, username, password):
+        self.extractor.log.info("Logging in as %s", username)
+
+        url = "https://weblogin.gfycat.com/oauth/webtoken"
+        headers = {"Origin": "https://gfycat.com"}
+        data = {
+            "access_key": "Anr96uuqt9EdamSCwK4txKPjMsf2"
+                          "M95Rfa5FLLhPFucu8H5HTzeutyAa",
+        }
+        response = self.extractor.request(
+            url, method="POST", headers=headers, json=data).json()
+
+        url = "https://weblogin.gfycat.com/oauth/weblogin"
+        headers["authorization"] = "Bearer " + response["access_token"]
+        data = {
+            "grant_type": "password",
+            "username"  : username,
+            "password"  : password,
+        }
+        response = self.extractor.request(
+            url, method="POST", headers=headers, json=data, fatal=None).json()
+
+        if "errorMessage" in response:
+            raise exception.AuthenticationError(
+                response["errorMessage"]["description"])
+        return "Bearer " + response["access_token"]
+
     def _call(self, endpoint, params=None):
+        if self.username:
+            self.authenticate()
+
         url = self.API_ROOT + endpoint
-        return self.extractor.request(url, params=params).json()
+        return self.extractor.request(
+            url, params=params, headers=self.headers).json()
 
     def _pagination(self, endpoint, params, key="gfycats"):
         while True:

scripts/supportedsites.py

@@ -312,6 +312,7 @@ AUTH_MAP = {
     "fanbox"         : _COOKIES,
     "fantia"         : _COOKIES,
     "flickr"         : _OAUTH,
+    "gfycat"         : "Supported",
     "furaffinity"    : _COOKIES,
     "horne"          : "Required",
     "idolcomplex"    : "Supported",

test/test_results.py

@@ -325,7 +325,7 @@ def setup_test_config():
     for category in ("danbooru", "atfbooru", "aibooru", "e621", "e926",
                      "instagram", "twitter", "subscribestar", "deviantart",
                      "inkbunny", "tapas", "pillowfort", "mangadex",
-                     "vipergirls"):
+                     "vipergirls", "gfycat"):
         config.set(("extractor", category), "username", None)
 
     config.set(("extractor", "mastodon.social"), "access-token",