103 lines
3.6 KiB
Python
103 lines
3.6 KiB
Python
import json
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from urllib import request as urllib_request
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from urllib.error import HTTPError, URLError
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from urllib.parse import urlencode
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from urllib.request import Request
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from wagtail.embeds.exceptions import EmbedException, EmbedNotFoundException
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from .oembed import OEmbedFinder
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class AccessDeniedFacebookOEmbedException(EmbedException):
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pass
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FACEBOOK_PROVIDERS = [
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# Videos
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{
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"endpoint": "https://graph.facebook.com/v11.0/oembed_video",
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"urls": [
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r"^https://(?:www\.)?facebook\.com/.+?/videos/.+$",
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r"^https://(?:www\.)?facebook\.com/video\.php\?(?:v|id)=.+$",
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r"^https://fb.watch/.+$",
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],
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},
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# Posts
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{
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"endpoint": "https://graph.facebook.com/v11.0/oembed_post",
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"urls": [
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r"^https://(?:www\.)?facebook\.com/.+?/(?:posts|activity)/.+$",
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r"^https://(?:www\.)?facebook\.com/photo\.php\?fbid=.+$",
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r"^https://(?:www\.)?facebook\.com/(?:photos|questions)/.+$",
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r"^https://(?:www\.)?facebook\.com/permalink\.php\?story_fbid=.+$",
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r"^https://(?:www\.)?facebook\.com/media/set/?\?set=.+$",
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r"^https://(?:www\.)?facebook\.com/notes/.+?/.+?/.+$",
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# At the moment, not documented on https://developers.facebook.com/docs/plugins/oembed-endpoints
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# Works for posts with a single photo
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r"^https://(?:www\.)?facebook\.com/.+?/photos/.+$",
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],
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},
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]
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class FacebookOEmbedFinder(OEmbedFinder):
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"""
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An embed finder that supports the authenticated Facebook oEmbed Endpoint.
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https://developers.facebook.com/docs/plugins/oembed
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"""
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def __init__(self, omitscript=False, app_id=None, app_secret=None):
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# {settings.facebook_APP_ID}|{settings.facebook_APP_SECRET}
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self.app_id = app_id
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self.app_secret = app_secret
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self.omitscript = omitscript
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super().__init__(providers=FACEBOOK_PROVIDERS)
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def find_embed(self, url, max_width=None, max_height=None):
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# Find provider
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endpoint = self._get_endpoint(url)
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if endpoint is None:
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raise EmbedNotFoundException
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params = {"url": url, "format": "json"}
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if max_width:
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params["maxwidth"] = max_width
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if max_height:
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params["maxheight"] = max_height
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if self.omitscript:
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params["omitscript"] = "true"
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# Configure request
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request = Request(endpoint + "?" + urlencode(params))
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request.add_header("Authorization", f"Bearer {self.app_id}|{self.app_secret}")
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# Perform request
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try:
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r = urllib_request.urlopen(request)
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except (HTTPError, URLError) as e:
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if isinstance(e, HTTPError) and e.code == 404:
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raise EmbedNotFoundException
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elif isinstance(e, HTTPError) and e.code in [400, 401, 403]:
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raise AccessDeniedFacebookOEmbedException
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else:
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raise EmbedNotFoundException
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oembed = json.loads(r.read().decode("utf-8"))
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# Return embed as a dict
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return {
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"title": oembed["title"] if "title" in oembed else "",
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"author_name": oembed["author_name"] if "author_name" in oembed else "",
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"provider_name": oembed["provider_name"]
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if "provider_name" in oembed
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else "Facebook",
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"type": oembed["type"],
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"thumbnail_url": oembed.get("thumbnail_url"),
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"width": oembed.get("width"),
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"height": oembed.get("height"),
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"html": oembed.get("html"),
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}
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embed_finder_class = FacebookOEmbedFinder
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