Commit Graph

180 Commits

Author SHA1 Message Date
Eugen Rochko ae1b9cf70a
Fix remote poll expiration time (#10144) 2019-03-04 00:44:34 +01:00
Eugen Rochko 230a012f00
Add polls (#10111)
* Add polls

Fix #1629

* Add tests

* Fixes

* Change API for creating polls

* Use name instead of content for votes

* Remove poll validation for remote polls

* Add polls to public pages

* When updating the poll, update options just in case they were changed

* Fix public pages showing both poll and other media
2019-03-03 22:18:23 +01:00
ThibG d8498b3983 Give the `replies` collection an identifier and enable pagination (#10128) 2019-02-28 18:16:34 +01:00
ThibG 9d3c6f1849 Improved remote thread fetching (#10106)
* Fetch up to 5 replies when discovering a new remote status

This is used for resolving threads downwards. The originating
server must add a “replies” attributes with such replies for it to
be useful.

* Add some tests for ActivityPub::FetchRepliesWorker

* Add specs for ActivityPub::FetchRepliesService

* Serialize up to 5 public self-replies for ActivityPub notes

* Add specs for ActivityPub::NoteSerializer

* Move exponential backoff logic to a worker concern

* Fetch first page of paginated collections when fetching thread replies

* Add specs for paginated collections in replies

* Move Note replies serialization to a first CollectionPage

The collection isn't actually paginable yet as it has no id nor
a `next` field. This may come in another PR.

* Use pluck(:uri) instead of map(&:uri) to improve performances

* Fix fetching replies when they are in a CollectionPage
2019-02-28 15:22:21 +01:00
ThibG 9edab46368 Fix mention processing for unknwon accounts on incoming ActivityPub Notes (#10125)
`::FetchRemoteAccountService` is not `ActivityPub::FetchRemoteAccountService`,
its second argument is the pre-fetched body. Passing `id: false` actually passed
a `Hash` as the prefetched body, instead of properly resolving unknown remote
accounts.
2019-02-27 14:57:14 +01:00
Eugen Rochko 1a1b8170bb
Fix Announce activities of unknown statuses not fetching those statuses (#10065)
Regression from #9998
2019-02-17 15:16:36 +01:00
Eugen Rochko 147b4c2c3a
Add logging for rejected ActivityPub payloads and add tests (#10062) 2019-02-17 03:38:25 +01:00
Eugen Rochko c417e8c198
Filter incoming Announce activities by relation to local activity (#10041)
* Filter incoming Announce activities by relation to local activity

Reject if announcer is not followed by local accounts, and is not
from an enabled relay, and the object is not a local status

Follow-up to #10005

* Fix tests
2019-02-15 18:19:45 +01:00
Eugen Rochko dad339da6d
Filter incoming Create activities by relation to local activity (#10005)
Reject those from accounts with no local followers, from relays
that are not enabled, which do not address local accounts and are
not replies to accounts that do have local followers
2019-02-13 18:42:47 +01:00
ThibG 6a5307a573 Alternative handling of private self-boosts (#9998)
* When self-boosting, embed original toot into Announce serialization

* Process unknown self-boosts from Announce object if it is more than an URI

* Add some self-boost specs

* Only serialize private toots in self-Announces
2019-02-13 18:36:23 +01:00
ysksn bcfff65195 Create Redisable#redis (#9633)
* Create Redisable

* Use #redis instead of Redis.current
2019-02-02 19:11:38 +01:00
ThibG 75b1488cf4 Add tombstones for remote statuses (#9830)
* Add Tombstone model to remember object deletion

* Do not recreate a status if it has been deleted

* Record Tombstone for remote deleted items

Also, only record deleted items from same-host actors

* Clear an user's tombstones when their key change
2019-01-18 15:56:55 +01:00
Eugen Rochko 31f396b57d
Add support for non-public reblogs from ActivityPub (#9841)
Fix #9838
2019-01-18 15:56:21 +01:00
Eugen Rochko 4ab42287c0
Use summary as summary for converted ActivityPub objects (#9823)
Fix #8609
2019-01-16 18:36:17 +01:00
ThibG a4f07bad95 Reduce chances of race conditions when processing deleted toots (#9815)
* Reduce chances of race conditions when processing deleted toots

* Prevent race condition when processing deleted toots
2019-01-16 15:42:00 +01:00
ThibG 70be301d69 Ensure blocked user unfollows blocker if Block/Undo Block are processed out of order (#9687)
* Ensure blocked user unfollows blocker if Block/Undo Block are processed out of order

* Add specs for Block causing unfollow and for out-of-order Block + Undo
2019-01-02 01:12:02 +01:00
ThibG b2f4114550 Do not ignore federated reports targetting already-reported accounts (#9534) 2018-12-30 18:58:51 +01:00
ThibG 290932602b Reduce usage of LD signatures (#9659)
* Do not LDS-sign Follow, Accept, Reject, Undo, Block

* Do not use LDS for Create activities of private toots

* Minor cleanup

* Ignore unsigned activities instead of misattributing them

* Use status.distributable? instead of querying visibility directly
2018-12-30 09:48:59 +01:00
Eugen Rochko 0f938ff29c
Add handler for Move activity (#9629) 2018-12-29 02:24:36 +01:00
Eugen Rochko aa9a20cde0
Fix ThreadResolveWorker getting queued with invalid URLs (#9628) 2018-12-26 19:15:53 +01:00
Eugen Rochko 9311430ed7
Prevent multiple handlers for Delete of Actor from running (#9292) 2018-11-16 19:46:23 +01:00
ThibG 7f5a4be580 Fix emoji update date processing (#9255) 2018-11-10 23:59:51 +01:00
Eugen Rochko be202f9377
Accept the same payload in multiple inboxes and deliver (#9150) 2018-10-30 15:03:55 +01:00
m.b 2b18f5f85d Add Page AP type support (#9121) 2018-10-29 13:23:29 +01:00
ThibG e53cc673e7 Ignore invalid hashtags on remote statuses instead of rejecting them (#9118)
Fixes #9115
2018-10-26 22:48:35 +02:00
ThibG 82e7988afc Fix missing `mention` argument when processing incoming Create activities (#9114)
* Fix missing `mention` argument when processing incoming Create activities

* Fix typo (param → params)
2018-10-26 12:59:59 +02:00
Eugen Rochko d4cf963749
Allow inbox owner to view implicitly targeted ActivityPub payload (#9093)
Fix #9091
2018-10-25 18:12:22 +02:00
Eugen Rochko fd5285658f
Add option to block reports from domain (#8830) 2018-10-20 08:02:44 +02:00
Eugen Rochko ddd30f331c
Improve support for aspects/circles (#8950)
* Add silent column to mentions

* Save silent mentions in ActivityPub Create handler and optimize it

Move networking calls out of the database transaction

* Add "limited" visibility level masked as "private" in the API

Unlike DMs, limited statuses are pushed into home feeds. The access
control rules between direct and limited statuses is almost the same,
except for counter and conversation logic

* Ensure silent column is non-null, add spec

* Ensure filters don't check silent mentions for blocks/mutes

As those are "this person is also allowed to see" rather than "this
person is involved", therefore does not warrant filtering

* Clean up code

* Use Status#active_mentions to limit returned mentions

* Fix code style issues

* Use Status#active_mentions in Notification

And remove stream_entry eager-loading from Notification
2018-10-17 17:13:04 +02:00
Eugen Rochko 61d44dd11f
Fix typo in ActivityPub Create handler (#8952)
Regression from #8951
2018-10-11 02:10:15 +02:00
Eugen Rochko 790d3bc637
Move network calls out of transaction in ActivityPub handler (#8951)
Mention and emoji code may perform network calls, but does not need
to do that inside the database transaction. This may improve availability
of database connections when using pgBouncer in transaction mode.
2018-10-11 00:50:18 +02:00
ThibG ba444797d2 Fix handling of ActivityPub activities lacking some attributes (#8864) 2018-10-03 23:44:13 +02:00
Eugen Rochko ef69c655cc
Fix class autoloading issue in ActivityPub::Activity::Create (#8820) 2018-09-28 17:02:53 +02:00
Eugen Rochko f4d549d300
Redesign forms, verify link ownership with rel="me" (#8703)
* Verify link ownership with rel="me"

* Add explanation about verification to UI

* Perform link verifications

* Add click-to-copy widget for verification HTML

* Redesign edit profile page

* Redesign forms

* Improve responsive design of settings pages

* Restore landing page sign-up form

* Fix typo

* Support <link> tags, add spec

* Fix links not being verified on first discovery and passive updates
2018-09-18 16:45:58 +02:00
Eugen Rochko cabdbb7f9c
Add CLI task for rotating keys (#8466)
* If an Update is signed with known key, skip re-following procedure

Because it means the remote actor did *not* lose their database

* Add CLI method for rotating keys

    bin/tootctl accounts rotate [USERNAME]

Generates a new RSA key per account and sends out an Update activity
signed with the old key.

* Key rotation: Space out Update fan-outs every 5 minutes per 1000 accounts

* Skip suspended accounts in key rotation
2018-08-26 20:21:03 +02:00
Eugen Rochko b4ba4b1b5d
Spread out crawling randomly to avoid DDoSing the link (#8445)
* Spread out crawling randomly to avoid DDoSing the link

Fix #4486

* Remove trailing whitespace
2018-08-26 00:33:57 +02:00
M Somerville 95bd0d4528 Support ActivityStreams’ summaryMap. (#8422)
In the same way as contentMap and nameMap.
2018-08-25 13:27:34 +02:00
ThibG 42573b76f1 Do not crash if remote custom emoji does not define updated date (fixes #8376) (#8377) 2018-08-23 00:27:58 +02:00
ThibG 59f7f4c923 Implement Undo { Accept { Follow } } (fixes #8234) (#8245)
* Add Follow#revoke_request!

* Implement Undo { Accept { Follow } } (fixes #8234)
2018-08-17 16:24:56 +02:00
ThibG 1ee675d68b Use correct activity id in Accept when receiving duplicate Follow (fixes #8218) (#8244) 2018-08-17 14:08:17 +02:00
Eugen Rochko 39e361a56d
Expect relays to answer with accept/reject (#8179) 2018-08-12 18:16:26 +02:00
Eugen Rochko 07b799468d
Fix incorrect context definition for the "featured" keyword (#8090)
* Fix incorrect context definition for the "featured" keyword

Fix #8077

* Adjust context definition for movedTo
2018-07-30 19:33:37 +02:00
Eugen Rochko 6ba7d9d0d9
Do not accept ActivityPub follow requests from blocked user (#7756)
* Do not accept ActivityPub follow requests from blocked user

Fix #7745

* Deliver auto-rejection immediately when follow-requested by blocked account

* Fix trailing whitespace
2018-06-08 00:14:06 +02:00
Eugen Rochko 1e938b966e
Exclude unlisted, private and direct toots from affecting trends (#7686) 2018-05-31 16:47:28 +02:00
Eugen Rochko ab36e0ef72 Record trending tags from ActivityPub, too (#7647) 2018-05-28 12:21:04 +09:00
ThibG cdbdf7f98b Ignore multiple occurrences of a hashtag within a status (fixes #7585) (#7606) 2018-05-25 14:26:45 +02:00
Eugen Rochko 57b503d4ef
Resolve unknown status from Add activity, skip Remove if unknown (#7526)
Fix #7518
2018-05-18 11:33:56 +02:00
Akihiko Odaki 55fd55714a Raise Mastodon::RaceConditionError if Redis lock failed (#7511)
An explicit error allows user agents to know the error and Sidekiq to
retry.
2018-05-16 12:29:45 +02:00
ThibG 7467361d70 Fetch boosted statuses on behalf of a follower (fixes #7426) (#7459)
When an ActivityPub Announce is processed and the boosted toot is not known,
fetch it on behalf of one of the booster's followers. This is to allow
fetching self-boosts of previously-unknown private toots.

If fetching on behalf of a user fails, try fetching it anonymously: the
selected follower of a boosting user may be banned by the boosted toot's
author.
2018-05-12 16:48:32 +02:00
Eugen Rochko c947e2e4c5
Fix handling of malformed ActivityPub payloads when URIs are nil (#7370)
* Fix handling of malformed ActivityPub payloads when URIs are nil

* Gracefully handle JSON-LD canonicalization failures
2018-05-05 18:22:34 +02:00
Eugen Rochko 6793bec4c6
Store URIs of follows, follow requests and blocks for ActivityPub (#7160)
Same URI passed between follow request and follow, since they are
the same thing in ActivityPub. Local URIs are generated during
creation using UUIDs and are passed to serializers.
2018-05-04 21:14:34 +02:00
ThibG a24605961a Fixes/do not override timestamps (#7336)
* Revert "Fixes/do not override timestamps (#7331)"

This reverts commit 581a5c9d29.

* Document Snowflake ID corner-case a bit more

Snowflake IDs are used for two purposes: making object identifiers harder to
guess and ensuring they are in chronological order. For this reason, they
are based on the `created_at` attribute of the object.

Unfortunately, inserting items with older snowflakes IDs will break the
assumption of consumers of the paging APIs that new items will always have
a greater identifier than the last seen one.

* Add `override_timestamps` virtual attribute to not correlate snowflake ID with created_at
2018-05-03 23:02:46 +02:00
ThibG 581a5c9d29 Fixes/do not override timestamps (#7331)
* Do not override timestamps for incoming toots

* Remove every reference to override_timestamps

Statuses are now created with the announced publishing date
and are only pushed to timelines if that date is at most
6 hours earlier than the time at which it is processed.
2018-05-03 13:33:08 +02:00
ThibG d0cdd5cf94 Accept actor object updates from all supported actor types (#7312) 2018-05-02 16:08:16 +02:00
Surinna Curtis dc786c0cf4 Support Actors/Statuses with multiple types (#7305)
* Add equals_or_includes_any? helper in JsonLdHelper

* Support arrays in JSON-LD type fields for actors/tags/objects.

* Spec for resolving accounts with extension types

* Style tweaks for codeclimate
2018-05-02 12:40:24 +02:00
Eugen Rochko 78ed4ab75f
Add bio fields (#6645)
* Add bio fields

- Fix #3211
- Fix #232
- Fix #121

* Display bio fields in web UI

* Fix output of links and missing fields

* Federate bio fields over ActivityPub as PropertyValue

* Improve how the fields are stored, add to Edit profile form

* Add rel=me to links in fields

Fix #121
2018-04-14 12:41:08 +02:00
Eugen Rochko b5726def55
Forward deletes on the same path as reply forwarding (#7058)
* Forward deletes on the same path as reply forwarding

* Remove trailing whitespace
2018-04-07 18:54:46 +02:00
ThibG e573bb0990 Fix compatibility with PeerTube (#6968)
* Support fetching objects of convertible types by URL (fixes #6924)

* Ignore invalid hashtags
2018-03-30 15:44:54 +02:00
ThibG 9ed5eebd7c Do not ignore unknown media attachments, only skip them (#6948)
That way, they are displayed in a list below the corresponding toot.
2018-03-29 00:52:24 +02:00
Eugen Rochko f02411da40
Ignore media validation when attaching to status during processing (#6822)
Fix #6821
2018-03-19 01:51:19 +01:00
MitarashiDango 6dcf96271e fix validation error (media only status) (#6684)
* fix validation error (media only status)

* Incorporating review suggestions

* Reflect similar fix to OStatus side

* Fix not to include media in transaction

* Restore the limit of the number of media

* Fix not to return nil
2018-03-08 01:22:47 +01:00
Eugen Rochko e6520c0270
Fix #6657 - Use target instead of origin in Remove activity (#6664) 2018-03-07 03:54:46 +01:00
Eugen Rochko 9110db41c5
Federate pinned statuses over ActivityPub (#6610)
* Federate pinned statuses over ActivityPub

* Display pinned toots in web UI

Fix #6117

* Fix migration

* Fix tests

* Update outbox_serializer.rb

* Update remove_serializer.rb

* Update add_serializer.rb

* Update fetch_featured_collection_service.rb
2018-03-04 09:19:11 +01:00
Eugen Rochko e852872846
Fix #5708: Reject->Follow will remove the follow if it exists (#6571) 2018-02-28 06:55:06 +01:00
Eugen Rochko 41a01bec23
Federated reports (#6570)
* Fix #2176: Federated reports

* UI for federated reports

* Add spec for ActivityPub Flag handler

* Add spec for ReportService
2018-02-28 06:54:55 +01:00
Eugen Rochko 90f12f2e5a
Focal points (#6520)
* Add focus param to media API, center thumbnails on focus point

* Add UI for setting a focal point

* Improve focal point icon on upload item

* Use focal point in upload preview

* Add focalPoint property to ActivityPub

* Don't show focal point button for non-image attachments
2018-02-22 00:35:46 +01:00
Eugen Rochko a71af98401
Push discovered status through streaming API within a time window (#6484)
Time window of 6 hours
2018-02-17 14:28:48 +01:00
Akihiko Odaki 0be9a1e321 Accept ActivityPub announce from the author of the original note (#6236) 2018-02-02 10:22:15 +01:00
ThibG b1e03197fa Process mentions and reblogs even from resolved threads (#6299)
This may lead to out-of-order notifications, but this is better than not having
notifications at all.
2018-01-19 19:11:35 +01:00
Eugen Rochko 35b84985a8
Skip ActivityPub Announces of non-public objects (#6230)
* Skip ActivityPub Announces of non-public objects

* Skip OStatus reblogs of non-public statuses
2018-01-09 19:35:10 +01:00
puckipedia 628358aeea Add the author of a status to cc if reblogged (#6226)
This makes slightly more sense, and ensures that the author of a post is always referenced in the audience (which some servers might rely on). And the announce is POSTed to the author's inbox anyways.
2018-01-09 00:47:43 +01:00
Eugen Rochko dbda87c31f
Revert #5772 (#6221) 2018-01-08 10:57:52 +01:00
Eugen Rochko e4a241abef
Fix bad URL schemes being accepted (#6219)
* Fix actors accepting invalid URI schemes or different host between URI and URL

* Fix statuses accepting invalid URI scheme or different host to actor

* Adjust tests to new requirements

* Improve readability of mismatching_origin?/invalid_origin? methods
2018-01-08 05:00:23 +01:00
puckipedia 0eff42d688 Move Article from supported to converted types (#6218) 2018-01-08 00:21:14 +01:00
Akihiko Odaki 161c72d66d Allow to dereference Follow object for ActivityPub (#5772)
* Allow to dereference Follow object for ActivityPub

* Accept IRI as object representation for Accept activity
2018-01-03 18:08:57 +01:00
Eugen Rochko d60fd87e01
Don't leave behind husk of remotely-deleted profile (#6159)
There's no reason for an Account record to persist after Delete->Actor is received. SuspendAccountService is necessary to make sure deleted toots get sent over streaming API properly and home feeds get cleaned up. By removing Account record, we can ensure that if in the future the account is restored remotely (or username reused), it can start with a clean slate.
2018-01-03 00:38:02 +01:00
abcang 3caec1ecc2 Save media outside transaction (#5959) 2017-12-10 16:33:52 +01:00
Yamagishi Kazutoshi b21db9bbde Using double splat operator (#5859) 2017-12-06 11:41:57 +01:00
Eugen Rochko 4c6b5dbe96
Add semi-support for Video/Image objects in ActivityPub (#5848)
* Add semi-support for Video/Image objects in ActivityPub

Video and Image objects will create corresponding status records
with manually crafted text contents (title + URL)

* Extract html-url-finding logic into JsonLdHelper

* Fallback to id when url missing, extract supported object types
2017-11-30 04:06:20 +01:00
Eugen Rochko 85e97ecab6
Fix too many forwards (#5854)
* Avoid sending explicit Undo->Announce when original deleted

* Do not forward a reply back to the server that sent it

* Deduplicate inboxes of rebloggers' followers for delete forwarding

* Adjust test

* Fix wrong class, bad SQL, wrong variable, outdated comment
2017-11-30 03:50:05 +01:00
Eugen Rochko 58cede4808
Profile redirect notes (#5746)
* Serialize moved accounts into REST and ActivityPub APIs

* Parse federated moved accounts from ActivityPub

* Add note about moved accounts to public profiles

* Add moved account message to web UI

* Fix code style issues
2017-11-18 19:39:02 +01:00
Renato "Lond" Cerqueira ad207456d6 Improve language filter (#5724)
* Scrub text of html before detecting language.

* Detect language on statuses coming from activitypub.

* Fix rubocop comments.

* Remove custom emoji from text before language detection
2017-11-16 13:51:38 +01:00
puckipedia 0cb329f63a Allow ActivityPub Note's tag and attachment to be single objects (#5534) 2017-10-27 16:10:36 +02:00
Eugen Rochko 484208ce12 When status is fetched instead of delivered, do not stream it (#5437) 2017-10-17 20:05:21 +02:00
unarist 8125fdc19f Use atomUri in Undo activity of Announce (#5376)
This allows deletion of reblogs which delivered before with OStatus URI.
2017-10-14 14:42:09 +02:00
Eugen Rochko 0717d9b3e6 Set snowflake IDs for backdated statuses (#5260)
- Rename Mastodon::TimestampIds into Mastodon::Snowflake for clarity
- Skip for statuses coming from inbox, aka delivered in real-time
- Skip for statuses that claim to be from the future
2017-10-08 17:34:34 +02:00
Eugen Rochko 3a3475450e Encode custom emojis as resolveable objects in ActivityPub (#5243)
* Encode custom emojis as resolveable objects in ActivityPub

* Improve code style
2017-10-07 17:43:42 +02:00
Akihiko Odaki 63f0979799 Validate id of ActivityPub representations (#5114)
Additionally, ActivityPub::FetchRemoteStatusService no longer parses
activities.
OStatus::Activity::Creation no longer delegates to ActivityPub because
the provided ActivityPub representations are not signed while OStatus
representations are.
2017-10-04 01:13:48 +02:00
Eugen Rochko 4ec1771165 Add ability to specify alternative text for media attachments (#5123)
* Fix #117 - Add ability to specify alternative text for media attachments

- POST /api/v1/media accepts `description` straight away
- PUT /api/v1/media/:id to update `description` (only for unattached ones)
- Serialized as `name` of Document object in ActivityPub
- Uploads form adjusted for better performance and description input

* Add tests

* Change undo button blend mode to difference
2017-09-28 15:31:31 +02:00
Eugen Rochko cf7fbf2c56 Fix #5059 - Stop processing payload if it's from local account (#5100) 2017-09-26 01:06:13 +02:00
Akihiko Odaki 98936bfcdf Add missing validations in ActivityPub::Activity::Create (#5096) 2017-09-25 18:33:11 +02:00
Akihiko Odaki bb4d005a83 Introduce OStatus::TagManager (#5008) 2017-09-19 18:08:08 +02:00
Eugen Rochko dce869dfc7 Define emoji context for ActivityPub (#5004)
* Define emoji context for ActivityPub

* Fix the emojo

* Use general Mastodon context instead
2017-09-19 05:05:48 +02:00
Eugen Rochko 81cec35dbf Custom emoji (#4988)
* Custom emoji

- In OStatus: `<link rel="emoji" name="coolcat" href="http://..." />`
- In ActivityPub: `{ type: "Emoji", name: ":coolcat:", href: "http://..." }`
- In REST API: Status object includes `emojis` array (`shortcode`, `url`)
- Domain blocks with reject media stop emojis
- Emoji file up to 50KB
- Web UI handles custom emojis
- Static pages render custom emojis as `<img />` tags

Side effects:

- Undo #4500 optimization, as I needed to modify it to restore
  shortcode handling in emojify()
- Formatter#plaintext should now make sure stripped out line-breaks
  and paragraphs are replaced with newlines

* Fix emoji at the start not being converted
2017-09-19 02:42:40 +02:00
unarist 17bf3363ac Add published property to ActivityPub activity for reblogs (#5000)
Since reblogs are serialized as Announce activity, its published property can be used for the creation time of reblog.
2017-09-18 20:30:11 +02:00
unarist 3f07f1b2b1 Raise an error on getting activity uri for remote status (#4984)
We had returned `nil` for that case, but this raises an error instead, as a wrong usage of the method.
This method is currently only used in ActivitySerializer.
2017-09-17 13:51:34 +02:00
ThibG 4a73615193 Fix race condition when receiving an ActivityPub Create multiple times (#4930)
* Fix race condition when receiving an ActivityPub Create multiple times

* Use a RedisLock to avoid concurrent processing of a same Create activity
2017-09-14 22:26:22 +02:00
Eugen Rochko 881856553e Fix #4894 - Merge context hash into final JSON hash after key transform (#4898) 2017-09-12 00:16:18 +02:00
unarist a12572e074 Handle stream_entry URL correctly in ActivityPub (#4854)
In before, the method uses stream_entry id as status id, so replied status was wrongly selected.

This PR uses StatusFinder which was introduced with `Api::Web::EmbedsController`.
2017-09-08 18:20:03 +02:00
Eugen Rochko 9b50a9dd83 Fix some ActivityPub JSON bugs (#4796)
- Fix assumption that `url` is always a string. Handle it if it's an
  array of strings, array of objects, object, or string, both for
  accounts and for objects
- `sharedInbox` is actually supposed to be under `endpoints`, handle
  both cases and adjust the serializer
2017-09-04 18:26:33 +02:00