Luke Barnard 34ed4f4206 Implement username availability checker ...

Outlined here: https://github.com/vector-im/riot-web/issues/3605#issuecomment-298679388

```HTTP
GET /_matrix/.../register/available
{
    "username": "desiredlocalpart123"
}
```

If available, the response looks like
```HTTP
HTTP/1.1 200 OK
{
    "available": true
}
```

Otherwise,
```HTTP
HTTP/1.1 429
{
    "errcode": "M_LIMIT_EXCEEDED",
    "error": "Too Many Requests",
    "retry_after_ms": 2000
}
```
or
```HTTP
HTTP/1.1 400
{
    "errcode": "M_USER_IN_USE",
    "error": "User ID already taken."
}

```
or
```HTTP
HTTP/1.1 400
{
    "errcode": "M_INVALID_USERNAME",
    "error": "Some reason for username being invalid"
}
```

2017-05-03 12:04:12 +01:00

..

__init__.py

copyrights

2016-01-07 04:26:29 +00:00

_base.py

GET /devices endpoint

2016-07-20 16:42:32 +01:00

account_data.py

m.read_marker -> m.fully_read (#2128)

2017-04-18 17:46:15 +01:00

account.py

Fix token request for addition of phone numbers

2017-03-23 18:46:17 +00:00

auth.py

window.postmessage for Interactive Auth fallback

2016-10-06 18:16:59 +01:00

devices.py

Implement _simple_delete_many_txn, use it to delete devices

2017-03-13 17:53:23 +00:00

filter.py

Refactor test_filter to use real DataStore

2016-10-18 12:17:38 -05:00

keys.py

sets aren't JSON serializable

2017-02-02 14:55:54 +00:00

notifications.py

Implement only=highlight on /notifications

2016-09-08 13:43:35 +01:00

openid.py

Rename openid/token to openid/request_token

2016-05-05 15:15:00 +01:00

read_marker.py

m.read_marker -> m.fully_read (#2128)

2017-04-18 17:46:15 +01:00

receipts.py

Shuffle receipt handler around so that worker apps don't need to load it

2016-11-23 15:14:24 +00:00

register.py

Implement username availability checker

2017-05-03 12:04:12 +01:00

report_event.py

Add timestamp and auto incrementing ID

2016-05-04 15:19:12 +01:00

sendtodevice.py

Allow guest access to endpoints for E2E

2016-11-25 15:26:34 +00:00

sync.py

Comment and remove spurious logging

2017-04-27 17:25:44 +01:00

tags.py

Use parse_json_object_from_request to parse JSON out of request bodies

2016-03-11 16:41:03 +00:00

thirdparty.py

switch to allow_guest=True for authing 3Ps as per PR feedback

2017-03-31 13:54:26 +01:00

tokenrefresh.py

Rip out more refresh_token code

2016-11-30 17:40:18 +00:00