[itchio] add 'game' extractor (#3923)

docs/supportedsites.md

@@ -427,6 +427,12 @@ Consider all sites to be NSFW unless otherwise known.
     <td>Galleries, individual Images</td>
     <td></td>
 </tr>
+<tr>
+    <td>itch.io</td>
+    <td>https://itch.io/</td>
+    <td>Games</td>
+    <td></td>
+</tr>
 <tr>
     <td>Keenspot</td>
     <td>http://www.keenspot.com/</td>

gallery_dl/extractor/__init__.py

@@ -74,6 +74,7 @@ modules = [
     "instagram",
     "issuu",
     "itaku",
+    "itchio",
     "kabeuchi",
     "keenspot",
     "kemonoparty",

gallery_dl/extractor/itchio.py

@@ -0,0 +1,82 @@
+# -*- 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://itch.io/"""
+
+from .common import Extractor, Message
+from .. import text
+
+
+class ItchioGameExtractor(Extractor):
+    """Extractor for itch.io games"""
+    category = "itchio"
+    subcategory = "game"
+    root = "https://itch.io"
+    directory_fmt = ("{category}", "{user[name]}")
+    filename_fmt = "{game[title]} ({id}).{extension}"
+    archive_fmt = "{id}"
+    pattern = r"(?:https?://)?(\w+).itch\.io/([\w-]+)"
+    test = (
+        ("https://sirtartarus.itch.io/a-craft-of-mine", {
+            "pattern": r"https://\w+\.ssl\.hwcdn\.net/upload2"
+                       r"/game/1983311/7723751\?",
+            "count": 1,
+            "keyword": {
+                "extension": "",
+                "filename": "7723751",
+                "game": {
+                    "id": 1983311,
+                    "noun": "game",
+                    "title": "A Craft Of Mine",
+                    "url": "https://sirtartarus.itch.io/a-craft-of-mine",
+                },
+                "user": {
+                    "id": 4060052,
+                    "name": "SirTartarus",
+                    "url": "https://sirtartarus.itch.io",
+                },
+            },
+        }),
+    )
+
+    def __init__(self, match):
+        self.user, self.slug = match.groups()
+        Extractor.__init__(self, match)
+
+    def items(self):
+        game_url = "https://{}.itch.io/{}".format(self.user, self.slug)
+        page = self.request(game_url).text
+
+        params = {
+            "source": "view_game",
+            "as_props": "1",
+            "after_download_lightbox": "true",
+        }
+        headers = {
+            "Referer": game_url,
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://{}.itch.io".format(self.user),
+        }
+        data = {
+            "csrf_token": text.unquote(self.session.cookies["itchio_token"]),
+        }
+
+        for upload_id in text.extract_iter(page, 'data-upload_id="', '"'):
+            file_url = "{}/file/{}".format(game_url, upload_id)
+            info = self.request(file_url, method="POST", params=params,
+                                headers=headers, data=data).json()
+
+            game = info["lightbox"]["game"]
+            user = info["lightbox"]["user"]
+            game["url"] = game_url
+            user.pop("follow_button", None)
+            game = {"game": game, "user": user, "id": upload_id}
+
+            url = info["url"]
+            yield Message.Directory, game
+            yield Message.Url, url, text.nameext_from_url(url, game)

scripts/supportedsites.py

@@ -63,6 +63,7 @@ CATEGORY_MAP = {
     "imgth"          : "imgth",
     "imgur"          : "imgur",
     "joyreactor"     : "JoyReactor",
+    "itchio"         : "itch.io",
     "kabeuchi"       : "かべうち",
     "kemonoparty"    : "Kemono",
     "lineblog"       : "LINE BLOG",