[4chanarchives] add 'thread' and 'board' extractors (#4012)

docs/supportedsites.md

@@ -37,6 +37,12 @@ Consider all sites to be NSFW unless otherwise known.
     <td>Boards, Threads</td>
     <td></td>
 </tr>
+<tr>
+    <td>4chanarchives</td>
+    <td>https://4chanarchives.com/</td>
+    <td>Boards, Threads</td>
+    <td></td>
+</tr>
 <tr>
     <td>500px</td>
     <td>https://500px.com/</td>

gallery_dl/extractor/4chanarchives.py

@@ -0,0 +1,136 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2023 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://4chanarchives.com/"""
+
+from .common import Extractor, Message
+from .. import text
+
+
+class _4chanarchivesThreadExtractor(Extractor):
+    """Extractor for threads on 4chanarchives.com"""
+    category = "4chanarchives"
+    subcategory = "thread"
+    root = "https://4chanarchives.com"
+    directory_fmt = ("{category}", "{board}", "{thread} - {title}")
+    filename_fmt = "{no}-{filename}.{extension}"
+    archive_fmt = "{board}_{thread}_{no}"
+    pattern = r"(?:https?://)?4chanarchives\.com/board/([^/?#]+)/thread/(\d+)"
+    test = (
+        ("https://4chanarchives.com/board/c/thread/2707110", {
+            "pattern": r"https://i\.imgur\.com/(0wLGseE|qbByWDc)\.jpg",
+            "count": 2,
+            "keyword": {
+                "board": "c",
+                "com": str,
+                "name": "Anonymous",
+                "no": int,
+                "thread": "2707110",
+                "time": r"re:2016-07-1\d \d\d:\d\d:\d\d",
+                "title": "Ren Kagami from 'Oyako Neburi'",
+            },
+        }),
+    )
+
+    def __init__(self, match):
+        Extractor.__init__(self, match)
+        self.board, self.thread = match.groups()
+
+    def items(self):
+        url = "{}/board/{}/thread/{}".format(
+            self.root, self.board, self.thread)
+        page = self.request(url).text
+        data = self.metadata(page)
+        posts = self.posts(page)
+
+        if not data["title"]:
+            data["title"] = text.unescape(text.remove_html(
+                posts[0]["com"]))[:50]
+
+        for post in posts:
+            post.update(data)
+            yield Message.Directory, post
+            if "url" in post:
+                yield Message.Url, post["url"], post
+
+    def metadata(self, page):
+        return {
+            "board"     : self.board,
+            "thread"    : self.thread,
+            "title"     : text.unescape(text.extr(
+                page, 'property="og:title" content="', '"')),
+        }
+
+    def posts(self, page):
+        """Build a list of all post objects"""
+        return [self.parse(html) for html in text.extract_iter(
+            page, 'id="pc', '</blockquote>')]
+
+    def parse(self, html):
+        """Build post object by extracting data from an HTML post"""
+        post = self._extract_post(html)
+        if ">File: <" in html:
+            self._extract_file(html, post)
+            post["extension"] = post["url"].rpartition(".")[2]
+        return post
+
+    @staticmethod
+    def _extract_post(html):
+        extr = text.extract_from(html)
+        return {
+            "no"  : text.parse_int(extr('', '"')),
+            "name": extr('class="name">', '<'),
+            "time": extr('class="dateTime postNum" >', '<').rstrip(),
+            "com" : text.unescape(
+                html[html.find('<blockquote'):].partition(">")[2]),
+        }
+
+    @staticmethod
+    def _extract_file(html, post):
+        extr = text.extract_from(html, html.index(">File: <"))
+        post["url"] = extr('href="', '"')
+        post["filename"] = text.unquote(extr(">", "<").rpartition(".")[0])
+        post["fsize"] = extr("(", ", ")
+        post["w"] = text.parse_int(extr("", "x"))
+        post["h"] = text.parse_int(extr("", ")"))
+
+
+class _4chanarchivesBoardExtractor(Extractor):
+    """Extractor for boards on 4chanarchives.com"""
+    category = "4chanarchives"
+    subcategory = "board"
+    root = "https://4chanarchives.com"
+    pattern = r"(?:https?://)?4chanarchives\.com/board/([^/?#]+)(?:/(\d+))?/?$"
+    test = (
+        ("https://4chanarchives.com/board/c/", {
+            "pattern": _4chanarchivesThreadExtractor.pattern,
+            "range": "1-40",
+            "count": 40,
+        }),
+        ("https://4chanarchives.com/board/c"),
+        ("https://4chanarchives.com/board/c/10"),
+    )
+
+    def __init__(self, match):
+        Extractor.__init__(self, match)
+        self.board, self.page = match.groups()
+
+    def items(self):
+        data = {"_extractor": _4chanarchivesThreadExtractor}
+        pnum = text.parse_int(self.page, 1)
+        needle = '''<span class="postNum desktop">
+                        <span><a href="'''
+
+        while True:
+            url = "{}/board/{}/{}".format(self.root, self.board, pnum)
+            page = self.request(url).text
+
+            for thread in text.extract_iter(page, needle, '"'):
+                yield Message.Queue, thread, data
+
+            pnum += 1

gallery_dl/extractor/__init__.py

@@ -15,6 +15,7 @@
     "35photo",
     "3dbooru",
     "4chan",
+    "4chanarchives",
     "500px",
     "8chan",
     "8muses",