[2ch] add 'thread' and 'board' extractors

- [2ch] add thread extractor
- [2ch] add board extractor
- [2ch] add new entry to supported sites

docs/supportedsites.md

@@ -13,6 +13,12 @@ Consider all listed sites to potentially be NSFW.
 </tr>
 </thead>
 <tbody valign="top">
+<tr>
+    <td>2ch</td>
+    <td>https://2ch.hk/</td>
+    <td>Boards, Threads</td>
+    <td></td>
+</tr>
 <tr>
     <td>2chen</td>
     <td>https://sturdychan.help/</td>

gallery_dl/extractor/2ch.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+
+# 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://www.2ch.hk/"""
+
+from .common import Extractor, Message
+from .. import text
+
+
+class _2chThreadExtractor(Extractor):
+    """Extractor for 2ch threads"""
+    category = "2ch"
+    subcategory = "thread"
+    directory_fmt = ("{category}", "{board}", "{thread} {title}")
+    filename_fmt = "{file_id} - {filename}.{extension}"
+    archive_fmt = "{board}_{thread}_{file_id}"
+    pattern = r"(?:https?://)?2ch\.hk/([^/]+)/res/(\d+)\.html"
+
+    def __init__(self, match):
+        Extractor.__init__(self, match)
+        self.board, self.thread = match.groups()
+
+    def items(self):
+        url = f"https://2ch.hk/{self.board}/res/{self.thread}.json"
+        thread_data = self.request(url).json()
+
+        posts = thread_data["threads"][0]["posts"]
+        post = posts[0]
+        title = post.get("subject") or text.remove_html(post["comment"])
+
+        thread_metadata = {
+            "board": self.board,
+            "thread": self.thread,
+            "title": text.unescape(title)[:50],
+        }
+
+        yield Message.Directory, thread_metadata
+        for post in posts:
+            if "files" in post and post['files']:
+                for file in post['files']:
+                    file_metadata = {
+                        "post_num": post["num"],
+                        "file_id": file["name"].split('.')[0],
+                        "filename": ".".join(file["fullname"].split('.')[:-1]),
+                        "extension": file["name"].split('.')[-1],
+                    }
+                    file_metadata.update(thread_metadata)
+
+                    url = f"https://2ch.hk/{file['path']}"
+                    yield Message.Url, url, file_metadata
+
+
+class _2chBoardExtractor(Extractor):
+    """Extractor for 2ch boards"""
+    category = "2ch"
+    subcategory = "board"
+    pattern = r"(?:https?://)?2ch\.hk/([a-z]+)/?$"
+
+    def __init__(self, match):
+        Extractor.__init__(self, match)
+        self.board = match.group(1)
+
+    def get_pages(self):
+        url = f"https://2ch.hk/{self.board}/index.json"
+        index_page = self.request(url).json()
+        pages_total = len(index_page['pages'])
+
+        yield index_page
+        for i in range(1, pages_total):
+            url = f"https://2ch.hk/{self.board}/{i}.json"
+            yield self.request(url).json()
+
+    def get_thread_nums(self):
+        for page in self.get_pages():
+            for thread in page["threads"]:
+                yield thread["thread_num"]
+
+    def items(self):
+        for thread_num in self.get_thread_nums():
+            url = f"https://2ch.hk/{self.board}/res/{thread_num}.html"
+            yield Message.Queue, url, {"_extractor": _2chThreadExtractor}

gallery_dl/extractor/__init__.py

@@ -10,6 +10,7 @@
 import re
 
 modules = [
+    "2ch",
     "2chan",
     "2chen",
     "35photo",