[jschan] add generic extractor for jschan imageboards

docs/supportedsites.md

@@ -1052,6 +1052,16 @@ Consider all sites to be NSFW unless otherwise known.
     <td></td>
 </tr>
 
+<tr>
+    <td colspan="4"><strong>jschan Imageboards</strong></td>
+</tr>
+<tr>
+    <td>94chan</td>
+    <td>https://94chan.org/</td>
+    <td>Boards, Threads</td>
+    <td></td>
+</tr>
+
 <tr>
     <td colspan="4"><strong>LynxChan Imageboards</strong></td>
 </tr>

gallery_dl/extractor/__init__.py

@@ -71,6 +71,7 @@
     "instagram",
     "issuu",
     "itaku",
+    "jschan",
     "kabeuchi",
     "keenspot",
     "kemonoparty",

gallery_dl/extractor/jschan.py

@@ -0,0 +1,96 @@
+# -*- 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 jschan Imageboards"""
+
+from .common import BaseExtractor, Message
+from .. import text
+import itertools
+
+
+class JschanExtractor(BaseExtractor):
+    basecategory = "jschan"
+
+
+BASE_PATTERN = JschanExtractor.update({
+    "94chan": {
+        "root": "https://94chan.org",
+        "pattern": r"94chan\.org"
+    }
+})
+
+
+class JschanThreadExtractor(JschanExtractor):
+    """Extractor for jschan threads"""
+    subcategory = "thread"
+    directory_fmt = ("{category}", "{board}",
+                     "{threadId} {subject[:50]|message[:50]}")
+    filename_fmt = "{postId}{num:?-//} {filename}.{extension}"
+    archive_fmt = "{board}_{postId}_{num}"
+    pattern = BASE_PATTERN + r"/([^/?#]+)/thread/(\d+)\.html"
+    test = (
+        ("https://94chan.org/art/thread/25.html", {
+            "pattern": r"https://94chan.org/file/[0-9a-f]{64}(\.\w+)?",
+            "count": ">= 15"
+        })
+    )
+
+    def __init__(self, match):
+        JschanExtractor.__init__(self, match)
+        index = match.lastindex
+        self.board = match.group(index-1)
+        self.thread = match.group(index)
+
+    def items(self):
+        url = "{}/{}/thread/{}.json".format(
+            self.root, self.board, self.thread)
+        thread = self.request(url).json()
+        thread["threadId"] = thread["postId"]
+        posts = thread.pop("replies", ())
+
+        yield Message.Directory, thread
+        for post in itertools.chain((thread,), posts):
+            files = post.pop("files", ())
+            if files:
+                thread.update(post)
+                for num, file in enumerate(files):
+                    file.update(thread)
+                    url = self.root + "/file/" + file["filename"]
+                    file["num"] = num
+                    file["count"] = len(files)
+                    file["siteFilename"] = file["filename"]
+                    text.nameext_from_url(file["originalFilename"], file)
+                    yield Message.Url, url, file
+
+
+class JschanBoardExtractor(JschanExtractor):
+    """Extractor for jschan boards"""
+    subcategory = "board"
+    pattern = (
+        BASE_PATTERN + r"/([^/?#]+)(?:/index\.html|"
+                       r"/catalog\.html|/\d+\.html|/?$)"
+    )
+    test = (
+        ("https://94chan.org/art/", {
+            "pattern": JschanThreadExtractor.pattern,
+            "count": ">= 30"
+        }),
+        ("https://94chan.org/art/2.html"),
+        ("https://94chan.org/art/catalog.html"),
+        ("https://94chan.org/art/index.html"),
+    )
+
+    def __init__(self, match):
+        JschanExtractor.__init__(self, match)
+        self.board = match.group(match.lastindex)
+
+    def items(self):
+        url = "{}/{}/catalog.json".format(self.root, self.board)
+        for thread in self.request(url).json():
+            url = "{}/{}/thread/{}.html".format(
+                self.root, self.board, thread["postId"])
+            thread["_extractor"] = JschanThreadExtractor
+            yield Message.Queue, url, thread

scripts/supportedsites.py

@@ -254,6 +254,7 @@
     "foolslide"   : "FoOlSlide Instances",
     "gelbooru_v01": "Gelbooru Beta 0.1.11",
     "gelbooru_v02": "Gelbooru Beta 0.2",
+    "jschan"      : "jschan Imageboards",
     "lolisafe"    : "lolisafe and chibisafe",
     "lynxchan"    : "LynxChan Imageboards",
     "moebooru"    : "Moebooru and MyImouto",