1 files changed, 223 insertions, 0 deletions
diff --git a/gallery_dl/extractor/cohost.py b/gallery_dl/extractor/cohost.py
new file mode 100644
index 0000000..e1f6040
--- /dev/null
+++ b/gallery_dl/extractor/cohost.py
@@ -0,0 +1,223 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2024 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://cohost.org/"""
+
+from .common import Extractor, Message
+from .. import text, util
+
+BASE_PATTERN = r"(?:https?://)?(?:www\.)?cohost\.org"
+
+
+class CohostExtractor(Extractor):
+    """Base class for cohost extractors"""
+    category = "cohost"
+    root = "https://cohost.org"
+    directory_fmt = ("{category}", "{postingProject[handle]}")
+    filename_fmt = ("{postId}_{headline|plainTextBody:?/_/[:100]}"
+                    "{num}.{extension}")
+    archive_fmt = "{postId}_{num}"
+
+    def _init(self):
+        self.replies = self.config("replies", True)
+        self.pinned = self.config("pinned", False)
+        self.shares = self.config("shares", False)
+        self.asks = self.config("asks", True)
+
+    def items(self):
+        for post in self.posts():
+            reason = post.get("limitedVisibilityReason")
+            if reason and reason != "none":
+                if reason == "log-in-first":
+                    reason = ("This page's posts are visible only to users "
+                              "who are logged in.")
+                self.log.warning('%s: "%s"', post["postId"], reason)
+
+            files = self._extract_files(post)
+            post["count"] = len(files)
+            post["date"] = text.parse_datetime(
+                post["publishedAt"], "%Y-%m-%dT%H:%M:%S.%fZ")
+
+            yield Message.Directory, post
+            for post["num"], file in enumerate(files, 1):
+                url = file["fileURL"]
+                post.update(file)
+                text.nameext_from_url(url, post)
+                yield Message.Url, url, post
+
+    def posts(self):
+        return ()
+
+    def _request_api(self, endpoint, input):
+        url = "{}/api/v1/trpc/{}".format(self.root, endpoint)
+        params = {"batch": "1", "input": util.json_dumps({"0": input})}
+        headers = {"content-type": "application/json"}
+
+        data = self.request(url, params=params, headers=headers).json()
+        return data[0]["result"]["data"]
+
+    def _extract_files(self, post):
+        files = []
+
+        self._extract_blocks(post, files)
+        if self.shares and post.get("shareTree"):
+            for share in post["shareTree"]:
+                self._extract_blocks(share, files, share)
+            del post["shareTree"]
+
+        return files
+
+    def _extract_blocks(self, post, files, shared=None):
+        post["content"] = content = []
+
+        for block in post.pop("blocks") or ():
+            try:
+                type = block["type"]
+                if type == "attachment":
+                    file = block["attachment"].copy()
+                    file["shared"] = shared
+                    files.append(file)
+                elif type == "attachment-row":
+                    for att in block["attachments"]:
+                        file = att["attachment"].copy()
+                        file["shared"] = shared
+                        files.append(file)
+                elif type == "markdown":
+                    content.append(block["markdown"]["content"])
+                elif type == "ask":
+                    post["ask"] = block["ask"]
+                else:
+                    self.log.debug("%s: Unsupported block type '%s'",
+                                   post["postId"], type)
+            except Exception as exc:
+                self.log.debug("%s: %s", exc.__class__.__name__, exc)
+
+
+class CohostUserExtractor(CohostExtractor):
+    """Extractor for media from a cohost user"""
+    subcategory = "user"
+    pattern = BASE_PATTERN + r"/([^/?#]+)/?(?:$|\?|#)"
+    example = "https://cohost.org/USER"
+
+    def posts(self):
+        empty = 0
+        params = {
+            "projectHandle": self.groups[0],
+            "page": 0,
+            "options": {
+                "pinnedPostsAtTop"    : bool(self.pinned),
+                "hideReplies"         : not self.replies,
+                "hideShares"          : not self.shares,
+                "hideAsks"            : not self.asks,
+                "viewingOnProjectPage": True,
+            },
+        }
+
+        while True:
+            data = self._request_api("posts.profilePosts", params)
+
+            posts = data["posts"]
+            if posts:
+                empty = 0
+                yield from posts
+            else:
+                empty += 1
+
+            pagination = data["pagination"]
+            if not pagination.get("morePagesForward"):
+                return
+            if empty >= 3:
+                return self.log.debug("Empty API results")
+            params["page"] = pagination["nextPage"]
+
+
+class CohostPostExtractor(CohostExtractor):
+    """Extractor for media from a single cohost post"""
+    subcategory = "post"
+    pattern = BASE_PATTERN + r"/([^/?#]+)/post/(\d+)"
+    example = "https://cohost.org/USER/post/12345"
+
+    def posts(self):
+        endpoint = "posts.singlePost"
+        params = {
+            "handle": self.groups[0],
+            "postId": int(self.groups[1]),
+        }
+
+        data = self._request_api(endpoint, params)
+        post = data["post"]
+
+        try:
+            post["comments"] = data["comments"][self.groups[1]]
+        except LookupError:
+            post["comments"] = ()
+
+        return (post,)
+
+
+class CohostTagExtractor(CohostExtractor):
+    """Extractor for tagged posts"""
+    subcategory = "tag"
+    pattern = BASE_PATTERN + r"/([^/?#]+)/tagged/([^/?#]+)(?:\?([^#]+))?"
+    example = "https://cohost.org/USER/tagged/TAG"
+
+    def posts(self):
+        user, tag, query = self.groups
+        url = "{}/{}/tagged/{}".format(self.root, user, tag)
+        params = text.parse_query(query)
+        post_feed_key = ("tagged-post-feed" if user == "rc" else
+                         "project-tagged-post-feed")
+
+        while True:
+            page = self.request(url, params=params).text
+            data = util.json_loads(text.extr(
+                page, 'id="__COHOST_LOADER_STATE__">', '</script>'))
+
+            try:
+                feed = data[post_feed_key]
+            except KeyError:
+                feed = data.popitem()[1]
+
+            yield from feed["posts"]
+
+            pagination = feed["paginationMode"]
+            if not pagination.get("morePagesForward"):
+                return
+            params["refTimestamp"] = pagination["refTimestamp"]
+            params["skipPosts"] = \
+                pagination["currentSkip"] + pagination["idealPageStride"]
+
+
+class CohostLikesExtractor(CohostExtractor):
+    """Extractor for liked posts"""
+    subcategory = "likes"
+    pattern = BASE_PATTERN + r"/rc/liked-posts"
+    example = "https://cohost.org/rc/liked-posts"
+
+    def posts(self):
+        url = "{}/rc/liked-posts".format(self.root)
+        params = {}
+
+        while True:
+            page = self.request(url, params=params).text
+            data = util.json_loads(text.extr(
+                page, 'id="__COHOST_LOADER_STATE__">', '</script>'))
+
+            try:
+                feed = data["liked-posts-feed"]
+            except KeyError:
+                feed = data.popitem()[1]
+
+            yield from feed["posts"]
+
+            pagination = feed["paginationMode"]
+            if not pagination.get("morePagesForward"):
+                return
+            params["refTimestamp"] = pagination["refTimestamp"]
+            params["skipPosts"] = \
+                pagination["currentSkip"] + pagination["idealPageStride"]