[zerochan] implement login with username & password (#1434)

README.rst

@@ -218,7 +218,8 @@ and optional for
 ``subscribestar``,
 ``tapas``,
 ``tsumino``,
-and ``twitter``.
+``twitter``,
+and ``zerochan``.
 
 You can set the necessary information in your configuration file
 (cf. gallery-dl.conf_)

docs/configuration.rst

@@ -377,6 +377,7 @@ Description
     * ``tapas``
     * ``tsumino``
     * ``twitter``
+    * ``zerochan``
 
     These values can also be specified via the
     ``-u/--username`` and ``-p/--password`` command-line options or

docs/gallery-dl.conf

@@ -329,6 +329,11 @@
             "module": null,
             "raw-options": null
         },
+        "zerochan":
+        {
+            "username": null,
+            "password": null
+        },
         "booru":
         {
             "tags": false,

gallery_dl/extractor/zerochan.py

@@ -9,7 +9,8 @@
 """Extractors for https://www.zerochan.net/"""
 
 from .booru import BooruExtractor
-from .. import text
+from ..cache import cache
+from .. import text, exception
 
 BASE_PATTERN = r"(?:https?://)?(?:www\.)?zerochan\.net"
 
@@ -20,6 +21,38 @@ class ZerochanExtractor(BooruExtractor):
     root = "https://www.zerochan.net"
     filename_fmt = "{id}.{extension}"
     archive_fmt = "{id}"
+    cookiedomain = ".zerochan.net"
+    cookienames = ("z_id", "z_hash")
+
+    def login(self):
+        if not self._check_cookies(self.cookienames):
+            username, password = self._get_auth_info()
+            if username:
+                self._update_cookies(self._login_impl(username, password))
+        # force legacy layout
+        self.session.cookies.set("v3", "0", domain=self.cookiedomain)
+
+    @cache(maxage=90*86400, keyarg=1)
+    def _login_impl(self, username, password):
+        self.log.info("Logging in as %s", username)
+
+        url = self.root + "/login"
+        headers = {
+            "Origin"  : self.root,
+            "Referer" : url,
+        }
+        data = {
+            "ref"     : "/",
+            "name"    : username,
+            "password": password,
+            "login"   : "Login",
+        }
+
+        response = self.request(url, method="POST", headers=headers, data=data)
+        if not response.history:
+            raise exception.AuthenticationError()
+
+        return response.cookies
 
     def _parse_entry_page(self, entry_id):
         url = "{}/{}".format(self.root, entry_id)