* Federation: Implement Query Profile API

Implements the server portion of: `GET
/_matrix/federation/v1/query/profile?user_id=...&field=...`

Closes #278
Signed-off-by: NAndrew (anoa) <anoa@openmailbox.org>

* Properly export profile-related structs and fix wording
Signed-off-by: NAndrew (anoa) <anoa@openmailbox.org>

* Check provided user's domain matches our own.

This seems to have been missed when we folded all the readers and
writers packages into routing.

The HTTP handlers in the components are split into reader and writer directories. This was a fairly arbitrary distinction, and turns out to not be so helpful. Most read APIs have a corresponding write API, and it is more natural for them to be in the same file rather than in different directories.

* Add opentracing Spans to the HTTP APIs

* Add opentracing spans to the HTTP RPC clients

* Set the span in the request context

* More docstring

* Append target profile to invite events created from a 3PID invite

* Don't redeclare err

* Add check on invited server

* Specify HTTP methods for the client API

* Specify HTTP methods for the federation API

* Specify HTTP methods for the media API

* Specify HTTP methods for the sync API

* Add comment

* gb vendor update github.com/matrix-org/gomatrixserverlib

* Add handler for the exchange_third_party_invite endpoint

* Doc

* Use SendEvents to send the invite to the roomserver

* Add missing error check

* Add checks

* Use federation to auth the event if the server isn't in the room

* Use MakeAPI for 3pid onbind handler as it isn't a standard federation request

* Error check

* Temporarily disable tests

* Fix return on 3PID invite

* Re-enable tests

* Remove useless else

* gb vendor update github.com/matrix-org/gomatrixserverlib

* gb vendor update github.com/matrix-org/gomatrixserverlib

* Implement same behaviour as synapse

* Fix condition and array initialisation

* Log errors on iteration and throw one if no server could be reached

* Fix err not being initialised

* Fix lint

* Fix import path

* Add missing file headers

* Move the ID server's signatures verification to common

* Allow verification without specifying a server name

* Add third-party structs to membership events content

* Add processing of 3PID onbind requests

* Use reference for third party invite data

* Fix return arguments order

* Revert "Move the ID server's signatures verification to common"

This reverts commit 93442010316ce71a77ac58ffd3613754ce8fe969.

* Revert "Allow verification without specifying a server name"

This reverts commit fd27afbf82eac50fe9f7b83b26cfce3c66d530d2.

* Remove checks that are already occurring in gomatrixserverlib

* Change return type of createInviteFrom3PIDInvite

* Add doc, add checks in fillDisplayName

* Use MakeFedAPI

* Invert condition

* Use AuthEvents to retrieve the 3PID invite

* Update comment

* Remove unused parameter

* gb vendor update github.com/matrix-org/gomatrixserverlib

* Turn on 'unparam' linting

* Increase deadline

* Fix mediaapi integeration test

* Add get event federation API

* Handle err correctly

* Add missing readers

* Ignore gocyclo lint for routing function

* Add todo

* Fix styling a bit

* Implement /federation/v1/invite/{roomID}/{eventID}

* Use NotJSON instead of BadJSON when the JSON couldn't be decoded

This makes it possible to setup all the component APIs on a single http
listener which is necessary if we want to combine all the components
into a single monolith.

* Move all the dendrite config in to a single place

* Add tests for config parsing

* replace syncserver config with common config

* Replace client API config with common config

* Replace federation API config with common config

* Replace media api config with common config

* Replace room server config with common config

* Remove unused readKey function

* Fix the integration tests

* Comment on hardcoding roomserver to HTTP

* Add a method for getting RoomServerURL

This moves the hardcoding of HTTPs into one place.

* Add API for querying events by ID.

* Fix tense

* Start implementing federation ingress

* More stuff

* Hook up federation event receiving

* Handle the case where we are missing state

* Fix docstring and comments

* Fix infinite loop when printing unknownRoomError

This reverts commit ce82158a.

* Add API for querying events by ID.

* Fix tense

* Start implementing federation ingress

* More stuff

* Hook up federation event receiving

* Fix comments

* Comment on the order of the arrays

* Start implementing the join room API

* Hacks to get join room working

* Make the TLS fingerprint configurable

* Fix the client API proxy to handle '#' correctly

* Return a 200 OK response

* Write the join event along with current state to the room server

* Comment on the error handling

* Fix typos

* Fix tab

* Add TODO for moving authEventIDs to gomatrixserverlib

* Comment on why we ignore the key ID argument for local keys

* Avoid 'preceeded'

* Neaten the control flow

* Neaten the control flow even more

* Return pointers

* Rename err to lastErr for the loop

* Start implementing the federation server keys API.

* Fix copyright

* Fix comments

* Comment on the key format

* Better explain what the ValidityPeriod is

* Return a 200 status code