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89 lines
2.4 KiB
Go
89 lines
2.4 KiB
Go
package websockets
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import (
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"net"
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"net/http"
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"os/exec"
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"strings"
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"golang.org/x/net/websocket"
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)
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// WebSocket represents a web socket server instance. A WebSocket
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// is instantiated for each new websocket request/connection.
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type WebSocket struct {
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Config
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*http.Request
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}
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// Handle handles a WebSocket connection. It launches the
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// specified command and streams input and output through
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// the command's stdin and stdout.
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func (ws WebSocket) Handle(conn *websocket.Conn) {
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cmd := exec.Command(ws.Command, ws.Arguments...)
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cmd.Stdin = conn
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cmd.Stdout = conn
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cmd.Stderr = conn // TODO: Make this configurable from the Caddyfile
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metavars, err := ws.buildEnv(cmd.Path)
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if err != nil {
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panic(err) // TODO
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}
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cmd.Env = metavars
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err = cmd.Run()
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if err != nil {
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panic(err)
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}
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}
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// buildEnv creates the meta-variables for the child process according
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// to the CGI 1.1 specification: http://tools.ietf.org/html/rfc3875#section-4.1
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// cmdPath should be the path of the command being run.
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// The returned string slice can be set to the command's Env property.
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func (ws WebSocket) buildEnv(cmdPath string) (metavars []string, err error) {
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remoteHost, remotePort, err := net.SplitHostPort(ws.RemoteAddr)
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if err != nil {
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return
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}
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serverHost, serverPort, err := net.SplitHostPort(ws.Host)
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if err != nil {
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return
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}
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metavars = []string{
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`AUTH_TYPE=`, // Not used
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`CONTENT_LENGTH=`, // Not used
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`CONTENT_TYPE=`, // Not used
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`GATEWAY_INTERFACE=` + GatewayInterface,
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`PATH_INFO=`, // TODO
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`PATH_TRANSLATED=`, // TODO
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`QUERY_STRING=` + ws.URL.RawQuery,
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`REMOTE_ADDR=` + remoteHost,
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`REMOTE_HOST=` + remoteHost, // TODO (Host lookups are slow; make this configurable)
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`REMOTE_IDENT=`, // Not used
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`REMOTE_PORT=` + remotePort,
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`REMOTE_USER=`, // Not used,
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`REQUEST_METHOD=` + ws.Method,
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`REQUEST_URI=` + ws.RequestURI,
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`SCRIPT_NAME=` + cmdPath, // path of the program being executed
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`SERVER_NAME=` + serverHost,
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`SERVER_PORT=` + serverPort,
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`SERVER_PROTOCOL=` + ws.Proto,
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`SERVER_SOFTWARE=` + ServerSoftware,
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}
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// Add each HTTP header to the environment as well
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for header, values := range ws.Header {
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value := strings.Join(values, ", ")
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header = strings.ToUpper(header)
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header = strings.Replace(header, "-", "_", -1)
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value = strings.Replace(value, "\n", " ", -1)
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metavars = append(metavars, "HTTP_"+header+"="+value)
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}
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return
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}
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