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author Miodrag Milanovic <mmicko@gmail.com>2016-03-05 10:37:42 +0100
committer Miodrag Milanovic <mmicko@gmail.com>2016-03-05 10:37:42 +0100
commit50a348dac626bf66a5ee1df82f95c6d188a0caae (patch)
tree8ce69a62bf183358145ecc386e49c519ef6960ef /src/osd/sdl/taputil.sh
parent38718313b19f7a4a676007298f22c50282c27bed (diff)
Improved French (Belgium) translations [Mevi]
Diffstat (limited to 'src/osd/sdl/taputil.sh')
0 files changed, 0 insertions, 0 deletions
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local websocketCodec = require('websocket-codec')

local function websocketHandler(options, handler)
  return function (req, res, go)
    -- Websocket connections must be GET requests
    -- with 'Upgrade: websocket'
    -- and 'Connection: Upgrade' headers
    local headers = req.headers
    local connection = headers.connection
    local upgrade = headers.upgrade
    if not (
      req.method == "GET" and
      upgrade and upgrade:lower():find("websocket", 1, true) and
      connection and connection:lower():find("upgrade", 1, true)
    ) then
      return go()
    end

    if options.filter and not options.filter(req) then
      return go()
    end

    -- If there is a sub-protocol specified, filter on it.
    local protocol = options.protocol
    if protocol then
      local list = headers["sec-websocket-protocol"]
      local foundProtocol
      if list then
        for item in list:gmatch("[^, ]+") do
          if item == protocol then
            foundProtocol = true
            break
          end
        end
      end
      if not foundProtocol then
        return go()
      end
    end

    -- Make sure it's a new client speaking v13 of the protocol
    assert(tonumber(headers["sec-websocket-version"]) >= 13, "only websocket protocol v13 supported")

    -- Get the security key
    local key = assert(headers["sec-websocket-key"], "websocket security required")

    res.code = 101
    headers = res.headers
    headers.Upgrade = "websocket"
    headers.Connection = "Upgrade"
    headers["Sec-WebSocket-Accept"] = websocketCodec.acceptKey(key)
    if protocol then
      headers["Sec-WebSocket-Protocol"] = protocol
    end
    function res.upgrade(read, write, updateDecoder, updateEncoder)
      updateDecoder(websocketCodec.decode)
      updateEncoder(websocketCodec.encode)
      local success, err = pcall(handler, req, read, write)
      if not success then
        print(err)
        write({
          opcode = 1,
          payload = err,
        })
        return write()
      end
    end
  end
end

local server = require('weblit-app')
function server.websocket(options, handler)
  server.route({
    method = "GET",
    path = options.path,
    host = options.host,
  }, websocketHandler(options, handler))
  return server
end

return websocketHandler