view tests/test-http-api-httpv2.t @ 37050:37d7a1d18b97

wireproto: define content negotiation for HTTPv2

HTTP messages communicate their media types and what media types
they can understand via the Content-Type and Accept header,
respectively.

While I don't want the wire protocol to lean too heavily on HTTP
because I'm aiming for the wire protocol to be as transport
agnostic as possible, it is nice to play by the spec if possible.

This commit defines our media negotiation mechanism for version
2 of the HTTP protocol. Essentially, we mandate the use of a
new media type and how clients and servers should react to
various headers or lack thereof.

The name of the media type is a placeholder. We purposefully don't
yet define the format of the new media type because that's a lot
of work.

I feel pretty strongly that we should use Content-Type. I feel
less strongly about Accept. I think it is reasonable for servers
to return the media type that was submitted to them. So we may
strike this header before the protocol is finished...

Differential Revision: https://phab.mercurial-scm.org/D2850

  $ HTTPV2=exp-http-v2-0001
  $ MEDIATYPE=application/mercurial-tbd

  $ send() {
  >   hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT/
  > }

  $ cat > dummycommands.py << EOF
  > from mercurial import wireprototypes, wireproto
  > @wireproto.wireprotocommand('customreadonly', permission='pull')
  > def customreadonly(repo, proto):
  >     return wireprototypes.bytesresponse(b'customreadonly bytes response')
  > @wireproto.wireprotocommand('customreadwrite', permission='push')
  > def customreadwrite(repo, proto):
  >     return wireprototypes.bytesresponse(b'customreadwrite bytes response')
  > EOF

  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > dummycommands = $TESTTMP/dummycommands.py
  > EOF

  $ hg init server
  $ cat > server/.hg/hgrc << EOF
  > [experimental]
  > web.apiserver = true
  > EOF
  $ hg -R server serve -p $HGPORT -d --pid-file hg.pid
  $ cat hg.pid > $DAEMON_PIDS

HTTP v2 protocol not enabled by default

  $ send << EOF
  > httprequest GET api/$HTTPV2
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     GET /api/exp-http-v2-0001 HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 404 Not Found\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 33\r\n
  s>     \r\n
  s>     API exp-http-v2-0001 not enabled\n

Restart server with support for HTTP v2 API

  $ killdaemons.py
  $ cat > server/.hg/hgrc << EOF
  > [experimental]
  > web.apiserver = true
  > web.api.http-v2 = true
  > EOF

  $ hg -R server serve -p $HGPORT -d --pid-file hg.pid
  $ cat hg.pid > $DAEMON_PIDS

Request to unknown command yields 404

  $ send << EOF
  > httprequest POST api/$HTTPV2/ro/badcommand
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/ro/badcommand HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 404 Not Found\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 42\r\n
  s>     \r\n
  s>     unknown wire protocol command: badcommand\n

GET to read-only command yields a 405

  $ send << EOF
  > httprequest GET api/$HTTPV2/ro/customreadonly
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     GET /api/exp-http-v2-0001/ro/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 405 Method Not Allowed\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Allow: POST\r\n
  s>     Content-Length: 30\r\n
  s>     \r\n
  s>     commands require POST requests

Missing Accept header results in 406

  $ send << EOF
  > httprequest POST api/$HTTPV2/ro/customreadonly
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/ro/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 406 Not Acceptable\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 72\r\n
  s>     \r\n
  s>     client MUST specify Accept header with value: application/mercurial-tbd\n

Bad Accept header results in 406

  $ send << EOF
  > httprequest POST api/$HTTPV2/ro/customreadonly
  >     accept: invalid
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/ro/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     accept: invalid\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 406 Not Acceptable\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 72\r\n
  s>     \r\n
  s>     client MUST specify Accept header with value: application/mercurial-tbd\n

Bad Content-Type header results in 415

  $ send << EOF
  > httprequest POST api/$HTTPV2/ro/customreadonly
  >     accept: $MEDIATYPE
  >     user-agent: test
  >     content-type: badmedia
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/ro/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     accept: application/mercurial-tbd\r\n
  s>     content-type: badmedia\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 415 Unsupported Media Type\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 75\r\n
  s>     \r\n
  s>     client MUST send Content-Type header with value: application/mercurial-tbd\n

Request to read-only command works out of the box

  $ send << EOF
  > httprequest POST api/$HTTPV2/ro/customreadonly
  >     accept: $MEDIATYPE
  >     content-type: $MEDIATYPE
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/ro/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     accept: application/mercurial-tbd\r\n
  s>     content-type: application/mercurial-tbd\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 200 OK\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 18\r\n
  s>     \r\n
  s>     ro/customreadonly\n

Request to read-write command fails because server is read-only by default

GET to read-write request yields 405

  $ send << EOF
  > httprequest GET api/$HTTPV2/rw/customreadonly
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     GET /api/exp-http-v2-0001/rw/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 405 Method Not Allowed\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Allow: POST\r\n
  s>     Content-Length: 30\r\n
  s>     \r\n
  s>     commands require POST requests

Even for unknown commands

  $ send << EOF
  > httprequest GET api/$HTTPV2/rw/badcommand
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     GET /api/exp-http-v2-0001/rw/badcommand HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 405 Method Not Allowed\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Allow: POST\r\n
  s>     Content-Length: 30\r\n
  s>     \r\n
  s>     commands require POST requests

SSL required by default

  $ send << EOF
  > httprequest POST api/$HTTPV2/rw/customreadonly
  >     user-agent: test
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/rw/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 403 ssl required\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Length: 17\r\n
  s>     \r\n
  s>     permission denied

Restart server to allow non-ssl read-write operations

  $ killdaemons.py
  $ cat > server/.hg/hgrc << EOF
  > [experimental]
  > web.apiserver = true
  > web.api.http-v2 = true
  > [web]
  > push_ssl = false
  > allow-push = *
  > EOF

  $ hg -R server serve -p $HGPORT -d --pid-file hg.pid
  $ cat hg.pid > $DAEMON_PIDS

Authorized request for valid read-write command works

  $ send << EOF
  > httprequest POST api/$HTTPV2/rw/customreadonly
  >     user-agent: test
  >     accept: $MEDIATYPE
  >     content-type: $MEDIATYPE
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/rw/customreadonly HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     accept: application/mercurial-tbd\r\n
  s>     content-type: application/mercurial-tbd\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 200 OK\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 18\r\n
  s>     \r\n
  s>     rw/customreadonly\n

Authorized request for unknown command is rejected

  $ send << EOF
  > httprequest POST api/$HTTPV2/rw/badcommand
  >     user-agent: test
  >     accept: $MEDIATYPE
  > EOF
  using raw connection to peer
  s>     POST /api/exp-http-v2-0001/rw/badcommand HTTP/1.1\r\n
  s>     Accept-Encoding: identity\r\n
  s>     accept: application/mercurial-tbd\r\n
  s>     user-agent: test\r\n
  s>     host: $LOCALIP:$HGPORT\r\n (glob)
  s>     \r\n
  s> makefile('rb', None)
  s>     HTTP/1.1 404 Not Found\r\n
  s>     Server: testing stub value\r\n
  s>     Date: $HTTP_DATE$\r\n
  s>     Content-Type: text/plain\r\n
  s>     Content-Length: 42\r\n
  s>     \r\n
  s>     unknown wire protocol command: badcommand\n