* Add a single config file format for dendrite.

This config file combines all the configuration needed by the
dendrite components into a single file.

* Resolve relative paths against the current working directory

* Review comments

* more review comments!

* Document what the purpose of the version field is

* Add ineffassign to the pre-comiit hooks

* Fix travis.yml

* Only apply ineffassign to the /src directory

* Add a database for storing the server keys

* Tweak wording, and comment on the resolution of the timestamp

* Update gomatrixserverlib

* cmd/mediaapi-integration-tests: Add foundation for testing

* common/test: Add some server init and client request utilities

* common/test/client: Handle timed out requests for tests that passed

* cmd/syncserver-integration-tests: Port to new common/test infra

* common/test/client: Remove stray debug print

* cmd/mediaapi-integration-tests: Simplify slice initialisation

* cmd/mediaapi-integration-tests: Simplify getMediaURL argument

* cmd/mediaapi-integration-tests: Make startMediaAPI return listen address

* common/test/client: Fix uninitialised LastRequestErr

* common/test/server: Remove redundant argument

* common/test/server: Add StartProxy to create a reverse proxy

* cmd/mediaapi-integration-tests: Add proxies in front of servers

This is needed so that origins can be correctly configured and used for
remote media.

* travis: Enable media API integration tests

* travis: Build the client-api-proxy for media tests

* common/test/client: Don't panic on EOF in CanonicalJSONInput

* cmd/mediaapi-integration-tests: Add upload/download/thumbnail tests

* mediaapi/thumbnailer: Store thumbnail according to requested size

* cmd/mediaapi-integration-tests: Add totem.jpg test file

* cmd/client-api-proxy: Optionally listen for HTTPS

* common/test/client: Do not verify TLS certs for testing

We will commonly use self-signed certs.

* cmd/mediaapi-integration-tests: Make HTTPS requests

* cmd/mediaapi-integration-tests: Log size and method for thumbnails

* mediaapi/thumbnailer: Factor out isThumbnailExists

Appease gocyclo^w^w simplify

* mediaapi/thumbnailer: Check if request is larger than original

* travis: Install openssl and generate server.{crt,key}

* cmd/mediaapi-integration-tests: Add valid dynamic thumbnail test

* cmd/mediaapi-integration-tests: Document state of tests

* cmd/mediaapi-integration-tests: Test remote thumbnail before download

This ordering also exercises the cold cache immediate generation of a
size configured for pregeneration.

* travis: Explain openssl key+cert generation

* common/test/server: Clarify postgresContainerName

* Fetching missing state from the roomserver.

Whenever the syncserver receives an event from the room server that adds
state that isn't in the syncserver's local database it should fetch
those state events from the roomserver.

* Fix append

* Put comment back

* Comments

* s/addsStateEvents/lookupStateEvents/

* Fix spelling

* Include the stream position that a state event was added at in the current state tables

* Fix comment

* Review comments

* 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

* vendor: Add bimg image processing library

bimg is MIT licensed. It depends on the C library libvips which is LGPL
v2.1+ licensed. libvips must be installed separately.

* mediaapi: Add YAML config file support

* mediaapi: Add thumbnail support

* mediaapi: Add missing thumbnail files

* travis: Add ppa and install libvips-dev

* travis: Another ppa and install libvips-dev attempt

* travis: Add sudo: required for sudo apt* usage

* mediaapi/thumbnailer: Make comparison code more readable

* mediaapi: Simplify logging of thumbnail properties

* mediaapi/thumbnailer: Rename metrics to fitness

Metrics is used in the context of monitoring with Prometheus so renaming
to avoid confusion.

* mediaapi/thumbnailer: Use math.Inf() for max aspect and size

* mediaapi/thumbnailer: Limit number of parallel generators

Fall back to selecting from already-/pre-generated thumbnails or serving
the original.

* mediaapi/thumbnailer: Split bimg code into separate file

* vendor: Add github.com/nfnt/resize pure go image scaler

* mediaapi/thumbnailer: Add nfnt/resize thumbnailer

* travis: Don't install libvips-dev via ppa

* mediaapi: Add notes to README about resizers

* mediaapi: Elaborate on scaling libs in README

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

Add support for downloading of remote files

If the active request were to panic, we need to ensure all the waiting
goroutines get woken up.

Avoid locking around db requests by only locking around active requests
and always creating an active request if there is none. A nice side
effect of this is that if many parallel requests for remote media come
in (a common case) then only one database query is made for the duration
of the query.

mediaapi/writers/download: Add local download support

So that they apply to all log messages thereafter

/upload handler and storage database