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author | ThibG <thib@sitedethib.com> | 2019-02-28 22:02:36 +0100 |
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committer | GitHub <noreply@github.com> | 2019-02-28 22:02:36 +0100 |
commit | b969b150e8f095dc91c19c7381923c2c19edb968 (patch) | |
tree | 015d70b4b633fadf70cab9d0a0b0fbd55e6456ae /app/services/activitypub | |
parent | 76ed481aa7b67d624675cdaa85bac583853fd24d (diff) | |
parent | 2267eee356a3d2b8ebb20892c5182b6f8169403e (diff) |
Merge pull request #932 from ThibG/glitch-soc/merge-upstream
Merge upstream changes
Diffstat (limited to 'app/services/activitypub')
-rw-r--r-- | app/services/activitypub/fetch_replies_service.rb | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/app/services/activitypub/fetch_replies_service.rb b/app/services/activitypub/fetch_replies_service.rb new file mode 100644 index 000000000..95c486a43 --- /dev/null +++ b/app/services/activitypub/fetch_replies_service.rb @@ -0,0 +1,60 @@ +# frozen_string_literal: true + +class ActivityPub::FetchRepliesService < BaseService + include JsonLdHelper + + def call(parent_status, collection_or_uri, allow_synchronous_requests = true) + @account = parent_status.account + @allow_synchronous_requests = allow_synchronous_requests + + @items = collection_items(collection_or_uri) + return if @items.nil? + + FetchReplyWorker.push_bulk(filtered_replies) + + @items + end + + private + + def collection_items(collection_or_uri) + collection = fetch_collection(collection_or_uri) + return unless collection.is_a?(Hash) + + collection = fetch_collection(collection['first']) if collection['first'].present? + return unless collection.is_a?(Hash) + + case collection['type'] + when 'Collection', 'CollectionPage' + collection['items'] + when 'OrderedCollection', 'OrderedCollectionPage' + collection['orderedItems'] + end + end + + def fetch_collection(collection_or_uri) + return collection_or_uri if collection_or_uri.is_a?(Hash) + return unless @allow_synchronous_requests + return if invalid_origin?(collection_or_uri) + collection = fetch_resource_without_id_validation(collection_or_uri) + raise Mastodon::UnexpectedResponseError if collection.nil? + collection + end + + def filtered_replies + # Only fetch replies to the same server as the original status to avoid + # amplification attacks. + + # Also limit to 5 fetched replies to limit potential for DoS. + @items.map { |item| value_or_id(item) }.reject { |uri| invalid_origin?(uri) }.take(5) + end + + def invalid_origin?(url) + return true if unsupported_uri_scheme?(url) + + needle = Addressable::URI.parse(url).host + haystack = Addressable::URI.parse(@account.uri).host + + !haystack.casecmp(needle).zero? + end +end |