[8chan] add 'thread' and 'board' extractors (#2938)

docs/supportedsites.md

@@ -49,6 +49,12 @@ Consider all sites to be NSFW unless otherwise known.
     <td>Favorites, Galleries, individual Images, User Profiles</td>
     <td></td>
 </tr>
+<tr>
+    <td>8chan</td>
+    <td>https://8chan.moe/</td>
+    <td>Boards, Threads</td>
+    <td></td>
+</tr>
 <tr>
     <td>8kun</td>
     <td>https://8kun.top/</td>

gallery_dl/extractor/8chan.py

@@ -0,0 +1,172 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2022 Mike Fährmann
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+"""Extractors for https://8chan.moe/"""
+
+from .common import Extractor, Message
+from .. import text
+from ..cache import memcache
+from datetime import datetime, timedelta
+import itertools
+
+BASE_PATTERN = r"(?:https?://)?8chan\.(moe|se|cc)"
+
+
+class _8chanExtractor(Extractor):
+    """Base class for 8chan extractors"""
+    category = "8chan"
+    root = "https://8chan.moe"
+
+    def __init__(self, match):
+        self.root = "https://8chan." + match.group(1)
+        Extractor.__init__(self, match)
+
+    @memcache()
+    def _prepare_cookies(self):
+        # fetch captcha cookies
+        # (necessary to download without getting interrupted)
+        now = datetime.utcnow()
+        url = self.root + "/captcha.js"
+        params = {"d": now.strftime("%a %b %d %Y %H:%M:%S GMT+0000 (UTC)")}
+        self.request(url, params=params).content
+
+        # adjust cookies
+        # - remove 'expires' timestamp
+        # - move 'captchaexpiration' value forward by 1 month)
+        domain = self.root.rpartition("/")[2]
+        for cookie in self.session.cookies:
+            if cookie.domain.endswith(domain):
+                cookie.expires = None
+                if cookie.name == "captchaexpiration":
+                    cookie.value = (now + timedelta(30, 300)).strftime(
+                        "%a, %d %b %Y %H:%M:%S GMT")
+
+        return self.session.cookies
+
+
+class _8chanThreadExtractor(_8chanExtractor):
+    """Extractor for 8chan threads"""
+    subcategory = "thread"
+    directory_fmt = ("{category}", "{boardUri}",
+                     "{threadId} {subject[:50]}")
+    filename_fmt = "{postId}{num:?-//} {filename[:200]}.{extension}"
+    archive_fmt = "{boardUri}_{postId}_{num}"
+    pattern = BASE_PATTERN + r"/([^/?#]+)/res/(\d+)"
+    test = (
+        ("https://8chan.moe/vhs/res/4.html", {
+            "pattern": r"https://8chan\.moe/\.media/[0-9a-f]{64}\.\w+$",
+            "count": 14,
+            "keyword": {
+                "archived": False,
+                "autoSage": False,
+                "boardDescription": "Film and Cinema",
+                "boardMarkdown": None,
+                "boardName": "Movies",
+                "boardUri": "vhs",
+                "creation": r"re:\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z",
+                "cyclic": False,
+                "email": None,
+                "id": "re:^[0-9a-f]{6}$",
+                "locked": False,
+                "markdown": str,
+                "maxFileCount": 5,
+                "maxFileSize": "32.00 MB",
+                "maxMessageLength": 8001,
+                "message": str,
+                "mime": str,
+                "name": "Anonymous",
+                "num": int,
+                "originalName": str,
+                "path": r"re:/.media/[0-9a-f]{64}\.\w+$",
+                "pinned": False,
+                "postId": int,
+                "signedRole": None,
+                "size": int,
+                "threadId": 4,
+                "thumb": r"re:/.media/t_[0-9a-f]{64}$",
+                "uniquePosters": 9,
+                "usesCustomCss": True,
+                "usesCustomJs": False,
+                "wsPort": 8880,
+                "wssPort": 2087,
+            },
+        }),
+        ("https://8chan.se/vhs/res/4.html"),
+        ("https://8chan.cc/vhs/res/4.html"),
+    )
+
+    def __init__(self, match):
+        _8chanExtractor.__init__(self, match)
+        _, self.board, self.thread = match.groups()
+
+    def items(self):
+        # fetch thread data
+        url = "{}/{}/res/{}.".format(self.root, self.board, self.thread)
+        self.session.headers["Referer"] = url + "html"
+        thread = self.request(url + "json").json()
+        thread["postId"] = thread["threadId"]
+        thread["_http_headers"] = {"Referer": url + "html"}
+
+        try:
+            self.session.cookies = self._prepare_cookies()
+        except Exception as exc:
+            self.log.debug("Failed to fetch captcha cookies:  %s: %s",
+                           exc.__class__.__name__, exc, exc_info=True)
+
+        # download files
+        posts = thread.pop("posts", ())
+        yield Message.Directory, thread
+        for post in itertools.chain((thread,), posts):
+            files = post.pop("files", ())
+            if not files:
+                continue
+            thread.update(post)
+            for num, file in enumerate(files):
+                file.update(thread)
+                file["num"] = num
+                text.nameext_from_url(file["originalName"], file)
+                yield Message.Url, self.root + file["path"], file
+
+
+class _8chanBoardExtractor(_8chanExtractor):
+    """Extractor for 8chan boards"""
+    subcategory = "board"
+    pattern = BASE_PATTERN + r"/([^/?#]+)/(?:(\d+)\.html)?$"
+    test = (
+        ("https://8chan.moe/vhs/"),
+        ("https://8chan.moe/vhs/2.html", {
+            "pattern": _8chanThreadExtractor.pattern,
+            "count": 23,
+        }),
+        ("https://8chan.se/vhs/"),
+        ("https://8chan.cc/vhs/"),
+    )
+
+    def __init__(self, match):
+        _8chanExtractor.__init__(self, match)
+        _, self.board, self.page = match.groups()
+        self.session.headers["Referer"] = self.root + "/"
+
+    def items(self):
+        page = text.parse_int(self.page, 1)
+        url = "{}/{}/{}.json".format(self.root, self.board, page)
+        board = self.request(url).json()
+        threads = board["threads"]
+
+        while True:
+            for thread in threads:
+                thread["_extractor"] = _8chanThreadExtractor
+                url = "{}/{}/res/{}.html".format(
+                    self.root, self.board, thread["threadId"])
+                yield Message.Queue, url, thread
+
+            page += 1
+            if page > board["pageCount"]:
+                return
+            url = "{}/{}/{}.json".format(self.root, self.board, page)
+            threads = self.request(url).json()["threads"]

gallery_dl/extractor/__init__.py

@@ -16,6 +16,7 @@
     "420chan",
     "4chan",
     "500px",
+    "8chan",
     "8kun",
     "8muses",
     "adultempire",

scripts/supportedsites.py

@@ -224,6 +224,9 @@
         "replies": "",
         "list-members": "List Members",
     },
+    "vk": {
+        "tagged": "Tagged Photos",
+    },
     "wallhaven": {
         "collections": "",
     },