def user_to_actor(self, user):
"""Converts a user to an actor.
Args:
user: dict, a decoded JSON Facebook user
Returns:
an ActivityStreams actor dict, ready to be JSON-encoded
"""
if not user:
return {}
id = user.get("id")
username = user.get("username")
handle = username or id
if not handle:
return {}
url = user.get("link")
if not url:
url = "http://facebook.com/" + handle
# facebook implements this as a 302 redirect
image_url = "http://graph.facebook.com/%s/picture?type=large" % handle
actor = {
"displayName": user.get("name"),
"image": {"url": image_url},
"id": self.tag_uri(handle),
"updated": util.maybe_iso8601_to_rfc3339(user.get("updated_time")),
"url": url,
"username": username,
"description": user.get("bio"),
}
location = user.get("location")
if location:
actor["location"] = {"id": location.get("id"), "displayName": location.get("name")}
return util.trim_nulls(actor)
def post_to_object(self, post):
"""Converts a post to an object.
Args:
post: dict, a decoded JSON post
Returns:
an ActivityStreams object dict, ready to be JSON-encoded
"""
object = {}
id = post.get("id")
if not id:
return {}
post_type = post.get("type")
status_type = post.get("status_type")
url = "http://facebook.com/" + id.replace("_", "/posts/")
picture = post.get("picture")
message = post.get("message")
if not message:
message = post.get("story")
display_name = None
data = post.get("data", {})
for field in ("object", "song"):
obj = data.get(field)
if obj:
id = obj.get("id")
post_type = obj.get("type")
url = obj.get("url")
display_name = obj.get("title")
object_type = OBJECT_TYPES.get(post_type)
author = self.user_to_actor(post.get("from"))
link = post.get("link", "")
if link.startswith("/gifts/"):
object_type = "product"
if not object_type:
if picture and not message:
object_type = "image"
else:
object_type = "note"
object = {
"id": self.tag_uri(str(id)),
"objectType": object_type,
"published": util.maybe_iso8601_to_rfc3339(post.get("created_time")),
"updated": util.maybe_iso8601_to_rfc3339(post.get("updated_time")),
"author": author,
"content": message,
# FB post ids are of the form USERID_POSTID
"url": url,
"image": {"url": picture},
"displayName": display_name,
}
# tags
tags = itertools.chain(
post.get("to", {}).get("data", []),
post.get("with_tags", {}).get("data", []),
*post.get("message_tags", {}).values()
)
object["tags"] = [
{
"objectType": OBJECT_TYPES.get(t.get("type"), "person"),
"id": self.tag_uri(t.get("id")),
"url": "http://facebook.com/%s" % t.get("id"),
"displayName": t.get("name"),
"startIndex": t.get("offset"),
"length": t.get("length"),
}
for t in tags
]
# is there an attachment? prefer to represent it as a picture (ie image
# object), but if not, fall back to a link.
att = {
"url": link if link else url,
"image": {"url": picture},
"displayName": post.get("name"),
"summary": post.get("caption"),
"content": post.get("description"),
}
if picture and picture.endswith("_s.jpg") and (post_type == "photo" or status_type == "added_photos"):
# a picture the user posted. get a larger size.
att.update({"objectType": "image", "image": {"url": picture[:-6] + "_o.jpg"}})
object["attachments"] = [att]
elif link and not link.startswith("/gifts/"):
att["objectType"] = "article"
object["attachments"] = [att]
# location
place = post.get("place")
if place:
id = place.get("id")
object["location"] = {"displayName": place.get("name"), "id": id, "url": "http://facebook.com/" + id}
location = place.get("location", None)
if isinstance(location, dict):
lat = location.get("latitude")
lon = location.get("longitude")
if lat and lon:
object["location"].update(
{
"latitude": lat,
"longitude": lon,
# ISO 6709 location string. details: http://en.wikipedia.org/wiki/ISO_6709
"position": "%+f%+f/" % (lat, lon),
}
)
# comments go in the replies field, according to the "Responses for
# Activity Streams" extension spec:
# http://activitystrea.ms/specs/json/replies/1.0/
comments = post.get("comments", {}).get("data")
if comments:
items = [self.comment_to_object(c) for c in comments]
object["replies"] = {"items": items, "totalItems": len(items)}
return util.trim_nulls(object)
