[okporn] add support (#8575)

* Add support for ok.porn
* update
    - adjust pattern/example/page_url
    - prevent unnecessary request
    - extract 'tags'
    - text.extract -> text.extr
    - return list comprehension result
* update supportedsites name
* update test results

---------

Co-authored-by: Mike Fährmann <mike_faehrmann@web.de>

gallery_dl/extractor/__init__.py

@@ -142,6 +142,7 @@ modules = [
     "nozomi",
     "nsfwalbum",
     "nudostar",
+    "okporn",
     "paheal",
     "patreon",
     "pexels",

gallery_dl/extractor/okporn.py

@@ -0,0 +1,39 @@
+# -*- 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://ok.porn/"""
+
+from .common import GalleryExtractor
+from .. import text
+
+
+class OkpornGalleryExtractor(GalleryExtractor):
+    """Extractor for image galleries from ok.porn"""
+    category = "okporn"
+    root = "https://ok.porn"
+    pattern = r"(?:https?://)?(?:www\.)?ok\.porn/albums/(\d+)"
+    example = "https://ok.porn/albums/12345/"
+
+    def __init__(self, match):
+        url = f"{self.root}/albums/{match[1]}/"
+        GalleryExtractor.__init__(self, match, url)
+
+    def metadata(self, page):
+        return {
+            "gallery_id" : text.parse_int(self.groups[0]),
+            "title"      : text.unescape(text.extr(
+                page, "h1 class=title>", "</h1>")),
+            "description": text.unescape(text.extr(
+                page, 'name="description" content="', '"')),
+            "tags": text.extr(
+                page, 'name="keywords" content="', '"').split(", "),
+        }
+
+    def images(self, page):
+        return [
+            (url, None)
+            for url in text.extract_iter(page, 'data-original="', '"')
+        ]