+
+Notes:
+
+1. Large messages are fragmented in [Chrome's new WebSocket implementation](http://www.ietf.org/mail-archive/web/hybi/current/msg10503.html).
+2. The application can get the type of a received data message by implementing
+ a [Codec marshal](http://godoc.org/golang.org/x/net/websocket#Codec.Marshal)
+ function.
+3. The go.net io.Reader and io.Writer operate across WebSocket frame boundaries.
+ Read returns when the input buffer is full or a frame boundary is
+ encountered. Each call to Write sends a single frame message. The Gorilla
+ io.Reader and io.WriteCloser operate on a single WebSocket message.
+
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/client.go b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/client.go
new file mode 100644
index 000000000..93db8ddc3
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/client.go
@@ -0,0 +1,269 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+ "bytes"
+ "crypto/tls"
+ "errors"
+ "io"
+ "io/ioutil"
+ "net"
+ "net/http"
+ "net/url"
+ "strings"
+ "time"
+)
+
+// ErrBadHandshake is returned when the server response to opening handshake is
+// invalid.
+var ErrBadHandshake = errors.New("websocket: bad handshake")
+
+// NewClient creates a new client connection using the given net connection.
+// The URL u specifies the host and request URI. Use requestHeader to specify
+// the origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies
+// (Cookie). Use the response.Header to get the selected subprotocol
+// (Sec-WebSocket-Protocol) and cookies (Set-Cookie).
+//
+// If the WebSocket handshake fails, ErrBadHandshake is returned along with a
+// non-nil *http.Response so that callers can handle redirects, authentication,
+// etc.
+func NewClient(netConn net.Conn, u *url.URL, requestHeader http.Header, readBufSize, writeBufSize int) (c *Conn, response *http.Response, err error) {
+ challengeKey, err := generateChallengeKey()
+ if err != nil {
+ return nil, nil, err
+ }
+ acceptKey := computeAcceptKey(challengeKey)
+
+ c = newConn(netConn, false, readBufSize, writeBufSize)
+ p := c.writeBuf[:0]
+ p = append(p, "GET "...)
+ p = append(p, u.RequestURI()...)
+ p = append(p, " HTTP/1.1\r\nHost: "...)
+ p = append(p, u.Host...)
+ // "Upgrade" is capitalized for servers that do not use case insensitive
+ // comparisons on header tokens.
+ p = append(p, "\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Version: 13\r\nSec-WebSocket-Key: "...)
+ p = append(p, challengeKey...)
+ p = append(p, "\r\n"...)
+ for k, vs := range requestHeader {
+ for _, v := range vs {
+ p = append(p, k...)
+ p = append(p, ": "...)
+ p = append(p, v...)
+ p = append(p, "\r\n"...)
+ }
+ }
+ p = append(p, "\r\n"...)
+
+ if _, err := netConn.Write(p); err != nil {
+ return nil, nil, err
+ }
+
+ resp, err := http.ReadResponse(c.br, &http.Request{Method: "GET", URL: u})
+ if err != nil {
+ return nil, nil, err
+ }
+ if resp.StatusCode != 101 ||
+ !strings.EqualFold(resp.Header.Get("Upgrade"), "websocket") ||
+ !strings.EqualFold(resp.Header.Get("Connection"), "upgrade") ||
+ resp.Header.Get("Sec-Websocket-Accept") != acceptKey {
+ return nil, resp, ErrBadHandshake
+ }
+ c.subprotocol = resp.Header.Get("Sec-Websocket-Protocol")
+ return c, resp, nil
+}
+
+// A Dialer contains options for connecting to WebSocket server.
+type Dialer struct {
+ // NetDial specifies the dial function for creating TCP connections. If
+ // NetDial is nil, net.Dial is used.
+ NetDial func(network, addr string) (net.Conn, error)
+
+ // TLSClientConfig specifies the TLS configuration to use with tls.Client.
+ // If nil, the default configuration is used.
+ TLSClientConfig *tls.Config
+
+ // HandshakeTimeout specifies the duration for the handshake to complete.
+ HandshakeTimeout time.Duration
+
+ // Input and output buffer sizes. If the buffer size is zero, then a
+ // default value of 4096 is used.
+ ReadBufferSize, WriteBufferSize int
+
+ // Subprotocols specifies the client's requested subprotocols.
+ Subprotocols []string
+}
+
+var errMalformedURL = errors.New("malformed ws or wss URL")
+
+// parseURL parses the URL. The url.Parse function is not used here because
+// url.Parse mangles the path.
+func parseURL(s string) (*url.URL, error) {
+ // From the RFC:
+ //
+ // ws-URI = "ws:" "//" host [ ":" port ] path [ "?" query ]
+ // wss-URI = "wss:" "//" host [ ":" port ] path [ "?" query ]
+ //
+ // We don't use the net/url parser here because the dialer interface does
+ // not provide a way for applications to work around percent deocding in
+ // the net/url parser.
+
+ var u url.URL
+ switch {
+ case strings.HasPrefix(s, "ws://"):
+ u.Scheme = "ws"
+ s = s[len("ws://"):]
+ case strings.HasPrefix(s, "wss://"):
+ u.Scheme = "wss"
+ s = s[len("wss://"):]
+ default:
+ return nil, errMalformedURL
+ }
+
+ u.Host = s
+ u.Opaque = "/"
+ if i := strings.Index(s, "/"); i >= 0 {
+ u.Host = s[:i]
+ u.Opaque = s[i:]
+ }
+
+ if strings.Contains(u.Host, "@") {
+ // WebSocket URIs do not contain user information.
+ return nil, errMalformedURL
+ }
+
+ return &u, nil
+}
+
+func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) {
+ hostPort = u.Host
+ hostNoPort = u.Host
+ if i := strings.LastIndex(u.Host, ":"); i > strings.LastIndex(u.Host, "]") {
+ hostNoPort = hostNoPort[:i]
+ } else {
+ if u.Scheme == "wss" {
+ hostPort += ":443"
+ } else {
+ hostPort += ":80"
+ }
+ }
+ return hostPort, hostNoPort
+}
+
+// DefaultDialer is a dialer with all fields set to the default zero values.
+var DefaultDialer *Dialer
+
+// Dial creates a new client connection. Use requestHeader to specify the
+// origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies (Cookie).
+// Use the response.Header to get the selected subprotocol
+// (Sec-WebSocket-Protocol) and cookies (Set-Cookie).
+//
+// If the WebSocket handshake fails, ErrBadHandshake is returned along with a
+// non-nil *http.Response so that callers can handle redirects, authentication,
+// etcetera. The response body may not contain the entire response and does not
+// need to be closed by the application.
+func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Response, error) {
+ u, err := parseURL(urlStr)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ hostPort, hostNoPort := hostPortNoPort(u)
+
+ if d == nil {
+ d = &Dialer{}
+ }
+
+ var deadline time.Time
+ if d.HandshakeTimeout != 0 {
+ deadline = time.Now().Add(d.HandshakeTimeout)
+ }
+
+ netDial := d.NetDial
+ if netDial == nil {
+ netDialer := &net.Dialer{Deadline: deadline}
+ netDial = netDialer.Dial
+ }
+
+ netConn, err := netDial("tcp", hostPort)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ defer func() {
+ if netConn != nil {
+ netConn.Close()
+ }
+ }()
+
+ if err := netConn.SetDeadline(deadline); err != nil {
+ return nil, nil, err
+ }
+
+ if u.Scheme == "wss" {
+ cfg := d.TLSClientConfig
+ if cfg == nil {
+ cfg = &tls.Config{ServerName: hostNoPort}
+ } else if cfg.ServerName == "" {
+ shallowCopy := *cfg
+ cfg = &shallowCopy
+ cfg.ServerName = hostNoPort
+ }
+ tlsConn := tls.Client(netConn, cfg)
+ netConn = tlsConn
+ if err := tlsConn.Handshake(); err != nil {
+ return nil, nil, err
+ }
+ if !cfg.InsecureSkipVerify {
+ if err := tlsConn.VerifyHostname(cfg.ServerName); err != nil {
+ return nil, nil, err
+ }
+ }
+ }
+
+ if len(d.Subprotocols) > 0 {
+ h := http.Header{}
+ for k, v := range requestHeader {
+ h[k] = v
+ }
+ h.Set("Sec-Websocket-Protocol", strings.Join(d.Subprotocols, ", "))
+ requestHeader = h
+ }
+
+ if len(requestHeader["Host"]) > 0 {
+ // This can be used to supply a Host: header which is different from
+ // the dial address.
+ u.Host = requestHeader.Get("Host")
+
+ // Drop "Host" header
+ h := http.Header{}
+ for k, v := range requestHeader {
+ if k == "Host" {
+ continue
+ }
+ h[k] = v
+ }
+ requestHeader = h
+ }
+
+ conn, resp, err := NewClient(netConn, u, requestHeader, d.ReadBufferSize, d.WriteBufferSize)
+
+ if err != nil {
+ if err == ErrBadHandshake {
+ // Before closing the network connection on return from this
+ // function, slurp up some of the response to aid application
+ // debugging.
+ buf := make([]byte, 1024)
+ n, _ := io.ReadFull(resp.Body, buf)
+ resp.Body = ioutil.NopCloser(bytes.NewReader(buf[:n]))
+ }
+ return nil, resp, err
+ }
+
+ netConn.SetDeadline(time.Time{})
+ netConn = nil // to avoid close in defer.
+ return conn, resp, nil
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/conn.go b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/conn.go
new file mode 100644
index 000000000..a2374a8f1
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/conn.go
@@ -0,0 +1,824 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+ "bufio"
+ "encoding/binary"
+ "errors"
+ "io"
+ "io/ioutil"
+ "math/rand"
+ "net"
+ "strconv"
+ "time"
+)
+
+const (
+ maxFrameHeaderSize = 2 + 8 + 4 // Fixed header + length + mask
+ maxControlFramePayloadSize = 125
+ finalBit = 1 << 7
+ maskBit = 1 << 7
+ writeWait = time.Second
+
+ defaultReadBufferSize = 4096
+ defaultWriteBufferSize = 4096
+
+ continuationFrame = 0
+ noFrame = -1
+)
+
+// Close codes defined in RFC 6455, section 11.7.
+const (
+ CloseNormalClosure = 1000
+ CloseGoingAway = 1001
+ CloseProtocolError = 1002
+ CloseUnsupportedData = 1003
+ CloseNoStatusReceived = 1005
+ CloseAbnormalClosure = 1006
+ CloseInvalidFramePayloadData = 1007
+ ClosePolicyViolation = 1008
+ CloseMessageTooBig = 1009
+ CloseMandatoryExtension = 1010
+ CloseInternalServerErr = 1011
+ CloseTLSHandshake = 1015
+)
+
+// The message types are defined in RFC 6455, section 11.8.
+const (
+ // TextMessage denotes a text data message. The text message payload is
+ // interpreted as UTF-8 encoded text data.
+ TextMessage = 1
+
+ // BinaryMessage denotes a binary data message.
+ BinaryMessage = 2
+
+ // CloseMessage denotes a close control message. The optional message
+ // payload contains a numeric code and text. Use the FormatCloseMessage
+ // function to format a close message payload.
+ CloseMessage = 8
+
+ // PingMessage denotes a ping control message. The optional message payload
+ // is UTF-8 encoded text.
+ PingMessage = 9
+
+ // PongMessage denotes a ping control message. The optional message payload
+ // is UTF-8 encoded text.
+ PongMessage = 10
+)
+
+// ErrCloseSent is returned when the application writes a message to the
+// connection after sending a close message.
+var ErrCloseSent = errors.New("websocket: close sent")
+
+// ErrReadLimit is returned when reading a message that is larger than the
+// read limit set for the connection.
+var ErrReadLimit = errors.New("websocket: read limit exceeded")
+
+// netError satisfies the net Error interface.
+type netError struct {
+ msg string
+ temporary bool
+ timeout bool
+}
+
+func (e *netError) Error() string { return e.msg }
+func (e *netError) Temporary() bool { return e.temporary }
+func (e *netError) Timeout() bool { return e.timeout }
+
+// CloseError represents close frame.
+type CloseError struct {
+
+ // Code is defined in RFC 6455, section 11.7.
+ Code int
+
+ // Text is the optional text payload.
+ Text string
+}
+
+func (e *CloseError) Error() string {
+ return "websocket: close " + strconv.Itoa(e.Code) + " " + e.Text
+}
+
+var (
+ errWriteTimeout = &netError{msg: "websocket: write timeout", timeout: true}
+ errUnexpectedEOF = &CloseError{Code: CloseAbnormalClosure, Text: io.ErrUnexpectedEOF.Error()}
+ errBadWriteOpCode = errors.New("websocket: bad write message type")
+ errWriteClosed = errors.New("websocket: write closed")
+ errInvalidControlFrame = errors.New("websocket: invalid control frame")
+)
+
+func hideTempErr(err error) error {
+ if e, ok := err.(net.Error); ok && e.Temporary() {
+ err = &netError{msg: e.Error(), timeout: e.Timeout()}
+ }
+ return err
+}
+
+func isControl(frameType int) bool {
+ return frameType == CloseMessage || frameType == PingMessage || frameType == PongMessage
+}
+
+func isData(frameType int) bool {
+ return frameType == TextMessage || frameType == BinaryMessage
+}
+
+func maskBytes(key [4]byte, pos int, b []byte) int {
+ for i := range b {
+ b[i] ^= key[pos&3]
+ pos++
+ }
+ return pos & 3
+}
+
+func newMaskKey() [4]byte {
+ n := rand.Uint32()
+ return [4]byte{byte(n), byte(n >> 8), byte(n >> 16), byte(n >> 24)}
+}
+
+// Conn represents a WebSocket connection.
+type Conn struct {
+ conn net.Conn
+ isServer bool
+ subprotocol string
+
+ // Write fields
+ mu chan bool // used as mutex to protect write to conn and closeSent
+ closeSent bool // true if close message was sent
+
+ // Message writer fields.
+ writeErr error
+ writeBuf []byte // frame is constructed in this buffer.
+ writePos int // end of data in writeBuf.
+ writeFrameType int // type of the current frame.
+ writeSeq int // incremented to invalidate message writers.
+ writeDeadline time.Time
+
+ // Read fields
+ readErr error
+ br *bufio.Reader
+ readRemaining int64 // bytes remaining in current frame.
+ readFinal bool // true the current message has more frames.
+ readSeq int // incremented to invalidate message readers.
+ readLength int64 // Message size.
+ readLimit int64 // Maximum message size.
+ readMaskPos int
+ readMaskKey [4]byte
+ handlePong func(string) error
+ handlePing func(string) error
+}
+
+func newConn(conn net.Conn, isServer bool, readBufferSize, writeBufferSize int) *Conn {
+ mu := make(chan bool, 1)
+ mu <- true
+
+ if readBufferSize == 0 {
+ readBufferSize = defaultReadBufferSize
+ }
+ if writeBufferSize == 0 {
+ writeBufferSize = defaultWriteBufferSize
+ }
+
+ c := &Conn{
+ isServer: isServer,
+ br: bufio.NewReaderSize(conn, readBufferSize),
+ conn: conn,
+ mu: mu,
+ readFinal: true,
+ writeBuf: make([]byte, writeBufferSize+maxFrameHeaderSize),
+ writeFrameType: noFrame,
+ writePos: maxFrameHeaderSize,
+ }
+ c.SetPingHandler(nil)
+ c.SetPongHandler(nil)
+ return c
+}
+
+// Subprotocol returns the negotiated protocol for the connection.
+func (c *Conn) Subprotocol() string {
+ return c.subprotocol
+}
+
+// Close closes the underlying network connection without sending or waiting for a close frame.
+func (c *Conn) Close() error {
+ return c.conn.Close()
+}
+
+// LocalAddr returns the local network address.
+func (c *Conn) LocalAddr() net.Addr {
+ return c.conn.LocalAddr()
+}
+
+// RemoteAddr returns the remote network address.
+func (c *Conn) RemoteAddr() net.Addr {
+ return c.conn.RemoteAddr()
+}
+
+// Write methods
+
+func (c *Conn) write(frameType int, deadline time.Time, bufs ...[]byte) error {
+ <-c.mu
+ defer func() { c.mu <- true }()
+
+ if c.closeSent {
+ return ErrCloseSent
+ } else if frameType == CloseMessage {
+ c.closeSent = true
+ }
+
+ c.conn.SetWriteDeadline(deadline)
+ for _, buf := range bufs {
+ if len(buf) > 0 {
+ n, err := c.conn.Write(buf)
+ if n != len(buf) {
+ // Close on partial write.
+ c.conn.Close()
+ }
+ if err != nil {
+ return err
+ }
+ }
+ }
+ return nil
+}
+
+// WriteControl writes a control message with the given deadline. The allowed
+// message types are CloseMessage, PingMessage and PongMessage.
+func (c *Conn) WriteControl(messageType int, data []byte, deadline time.Time) error {
+ if !isControl(messageType) {
+ return errBadWriteOpCode
+ }
+ if len(data) > maxControlFramePayloadSize {
+ return errInvalidControlFrame
+ }
+
+ b0 := byte(messageType) | finalBit
+ b1 := byte(len(data))
+ if !c.isServer {
+ b1 |= maskBit
+ }
+
+ buf := make([]byte, 0, maxFrameHeaderSize+maxControlFramePayloadSize)
+ buf = append(buf, b0, b1)
+
+ if c.isServer {
+ buf = append(buf, data...)
+ } else {
+ key := newMaskKey()
+ buf = append(buf, key[:]...)
+ buf = append(buf, data...)
+ maskBytes(key, 0, buf[6:])
+ }
+
+ d := time.Hour * 1000
+ if !deadline.IsZero() {
+ d = deadline.Sub(time.Now())
+ if d < 0 {
+ return errWriteTimeout
+ }
+ }
+
+ timer := time.NewTimer(d)
+ select {
+ case <-c.mu:
+ timer.Stop()
+ case <-timer.C:
+ return errWriteTimeout
+ }
+ defer func() { c.mu <- true }()
+
+ if c.closeSent {
+ return ErrCloseSent
+ } else if messageType == CloseMessage {
+ c.closeSent = true
+ }
+
+ c.conn.SetWriteDeadline(deadline)
+ n, err := c.conn.Write(buf)
+ if n != 0 && n != len(buf) {
+ c.conn.Close()
+ }
+ return err
+}
+
+// NextWriter returns a writer for the next message to send. The writer's
+// Close method flushes the complete message to the network.
+//
+// There can be at most one open writer on a connection. NextWriter closes the
+// previous writer if the application has not already done so.
+//
+// The NextWriter method and the writers returned from the method cannot be
+// accessed by more than one goroutine at a time.
+func (c *Conn) NextWriter(messageType int) (io.WriteCloser, error) {
+ if c.writeErr != nil {
+ return nil, c.writeErr
+ }
+
+ if c.writeFrameType != noFrame {
+ if err := c.flushFrame(true, nil); err != nil {
+ return nil, err
+ }
+ }
+
+ if !isControl(messageType) && !isData(messageType) {
+ return nil, errBadWriteOpCode
+ }
+
+ c.writeFrameType = messageType
+ return messageWriter{c, c.writeSeq}, nil
+}
+
+func (c *Conn) flushFrame(final bool, extra []byte) error {
+ length := c.writePos - maxFrameHeaderSize + len(extra)
+
+ // Check for invalid control frames.
+ if isControl(c.writeFrameType) &&
+ (!final || length > maxControlFramePayloadSize) {
+ c.writeSeq++
+ c.writeFrameType = noFrame
+ c.writePos = maxFrameHeaderSize
+ return errInvalidControlFrame
+ }
+
+ b0 := byte(c.writeFrameType)
+ if final {
+ b0 |= finalBit
+ }
+ b1 := byte(0)
+ if !c.isServer {
+ b1 |= maskBit
+ }
+
+ // Assume that the frame starts at beginning of c.writeBuf.
+ framePos := 0
+ if c.isServer {
+ // Adjust up if mask not included in the header.
+ framePos = 4
+ }
+
+ switch {
+ case length >= 65536:
+ c.writeBuf[framePos] = b0
+ c.writeBuf[framePos+1] = b1 | 127
+ binary.BigEndian.PutUint64(c.writeBuf[framePos+2:], uint64(length))
+ case length > 125:
+ framePos += 6
+ c.writeBuf[framePos] = b0
+ c.writeBuf[framePos+1] = b1 | 126
+ binary.BigEndian.PutUint16(c.writeBuf[framePos+2:], uint16(length))
+ default:
+ framePos += 8
+ c.writeBuf[framePos] = b0
+ c.writeBuf[framePos+1] = b1 | byte(length)
+ }
+
+ if !c.isServer {
+ key := newMaskKey()
+ copy(c.writeBuf[maxFrameHeaderSize-4:], key[:])
+ maskBytes(key, 0, c.writeBuf[maxFrameHeaderSize:c.writePos])
+ if len(extra) > 0 {
+ c.writeErr = errors.New("websocket: internal error, extra used in client mode")
+ return c.writeErr
+ }
+ }
+
+ // Write the buffers to the connection.
+ c.writeErr = c.write(c.writeFrameType, c.writeDeadline, c.writeBuf[framePos:c.writePos], extra)
+
+ // Setup for next frame.
+ c.writePos = maxFrameHeaderSize
+ c.writeFrameType = continuationFrame
+ if final {
+ c.writeSeq++
+ c.writeFrameType = noFrame
+ }
+ return c.writeErr
+}
+
+type messageWriter struct {
+ c *Conn
+ seq int
+}
+
+func (w messageWriter) err() error {
+ c := w.c
+ if c.writeSeq != w.seq {
+ return errWriteClosed
+ }
+ if c.writeErr != nil {
+ return c.writeErr
+ }
+ return nil
+}
+
+func (w messageWriter) ncopy(max int) (int, error) {
+ n := len(w.c.writeBuf) - w.c.writePos
+ if n <= 0 {
+ if err := w.c.flushFrame(false, nil); err != nil {
+ return 0, err
+ }
+ n = len(w.c.writeBuf) - w.c.writePos
+ }
+ if n > max {
+ n = max
+ }
+ return n, nil
+}
+
+func (w messageWriter) write(final bool, p []byte) (int, error) {
+ if err := w.err(); err != nil {
+ return 0, err
+ }
+
+ if len(p) > 2*len(w.c.writeBuf) && w.c.isServer {
+ // Don't buffer large messages.
+ err := w.c.flushFrame(final, p)
+ if err != nil {
+ return 0, err
+ }
+ return len(p), nil
+ }
+
+ nn := len(p)
+ for len(p) > 0 {
+ n, err := w.ncopy(len(p))
+ if err != nil {
+ return 0, err
+ }
+ copy(w.c.writeBuf[w.c.writePos:], p[:n])
+ w.c.writePos += n
+ p = p[n:]
+ }
+ return nn, nil
+}
+
+func (w messageWriter) Write(p []byte) (int, error) {
+ return w.write(false, p)
+}
+
+func (w messageWriter) WriteString(p string) (int, error) {
+ if err := w.err(); err != nil {
+ return 0, err
+ }
+
+ nn := len(p)
+ for len(p) > 0 {
+ n, err := w.ncopy(len(p))
+ if err != nil {
+ return 0, err
+ }
+ copy(w.c.writeBuf[w.c.writePos:], p[:n])
+ w.c.writePos += n
+ p = p[n:]
+ }
+ return nn, nil
+}
+
+func (w messageWriter) ReadFrom(r io.Reader) (nn int64, err error) {
+ if err := w.err(); err != nil {
+ return 0, err
+ }
+ for {
+ if w.c.writePos == len(w.c.writeBuf) {
+ err = w.c.flushFrame(false, nil)
+ if err != nil {
+ break
+ }
+ }
+ var n int
+ n, err = r.Read(w.c.writeBuf[w.c.writePos:])
+ w.c.writePos += n
+ nn += int64(n)
+ if err != nil {
+ if err == io.EOF {
+ err = nil
+ }
+ break
+ }
+ }
+ return nn, err
+}
+
+func (w messageWriter) Close() error {
+ if err := w.err(); err != nil {
+ return err
+ }
+ return w.c.flushFrame(true, nil)
+}
+
+// WriteMessage is a helper method for getting a writer using NextWriter,
+// writing the message and closing the writer.
+func (c *Conn) WriteMessage(messageType int, data []byte) error {
+ wr, err := c.NextWriter(messageType)
+ if err != nil {
+ return err
+ }
+ w := wr.(messageWriter)
+ if _, err := w.write(true, data); err != nil {
+ return err
+ }
+ if c.writeSeq == w.seq {
+ if err := c.flushFrame(true, nil); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// SetWriteDeadline sets the write deadline on the underlying network
+// connection. After a write has timed out, the websocket state is corrupt and
+// all future writes will return an error. A zero value for t means writes will
+// not time out.
+func (c *Conn) SetWriteDeadline(t time.Time) error {
+ c.writeDeadline = t
+ return nil
+}
+
+// Read methods
+
+// readFull is like io.ReadFull except that io.EOF is never returned.
+func (c *Conn) readFull(p []byte) (err error) {
+ var n int
+ for n < len(p) && err == nil {
+ var nn int
+ nn, err = c.br.Read(p[n:])
+ n += nn
+ }
+ if n == len(p) {
+ err = nil
+ } else if err == io.EOF {
+ err = errUnexpectedEOF
+ }
+ return
+}
+
+func (c *Conn) advanceFrame() (int, error) {
+
+ // 1. Skip remainder of previous frame.
+
+ if c.readRemaining > 0 {
+ if _, err := io.CopyN(ioutil.Discard, c.br, c.readRemaining); err != nil {
+ return noFrame, err
+ }
+ }
+
+ // 2. Read and parse first two bytes of frame header.
+
+ var b [8]byte
+ if err := c.readFull(b[:2]); err != nil {
+ return noFrame, err
+ }
+
+ final := b[0]&finalBit != 0
+ frameType := int(b[0] & 0xf)
+ reserved := int((b[0] >> 4) & 0x7)
+ mask := b[1]&maskBit != 0
+ c.readRemaining = int64(b[1] & 0x7f)
+
+ if reserved != 0 {
+ return noFrame, c.handleProtocolError("unexpected reserved bits " + strconv.Itoa(reserved))
+ }
+
+ switch frameType {
+ case CloseMessage, PingMessage, PongMessage:
+ if c.readRemaining > maxControlFramePayloadSize {
+ return noFrame, c.handleProtocolError("control frame length > 125")
+ }
+ if !final {
+ return noFrame, c.handleProtocolError("control frame not final")
+ }
+ case TextMessage, BinaryMessage:
+ if !c.readFinal {
+ return noFrame, c.handleProtocolError("message start before final message frame")
+ }
+ c.readFinal = final
+ case continuationFrame:
+ if c.readFinal {
+ return noFrame, c.handleProtocolError("continuation after final message frame")
+ }
+ c.readFinal = final
+ default:
+ return noFrame, c.handleProtocolError("unknown opcode " + strconv.Itoa(frameType))
+ }
+
+ // 3. Read and parse frame length.
+
+ switch c.readRemaining {
+ case 126:
+ if err := c.readFull(b[:2]); err != nil {
+ return noFrame, err
+ }
+ c.readRemaining = int64(binary.BigEndian.Uint16(b[:2]))
+ case 127:
+ if err := c.readFull(b[:8]); err != nil {
+ return noFrame, err
+ }
+ c.readRemaining = int64(binary.BigEndian.Uint64(b[:8]))
+ }
+
+ // 4. Handle frame masking.
+
+ if mask != c.isServer {
+ return noFrame, c.handleProtocolError("incorrect mask flag")
+ }
+
+ if mask {
+ c.readMaskPos = 0
+ if err := c.readFull(c.readMaskKey[:]); err != nil {
+ return noFrame, err
+ }
+ }
+
+ // 5. For text and binary messages, enforce read limit and return.
+
+ if frameType == continuationFrame || frameType == TextMessage || frameType == BinaryMessage {
+
+ c.readLength += c.readRemaining
+ if c.readLimit > 0 && c.readLength > c.readLimit {
+ c.WriteControl(CloseMessage, FormatCloseMessage(CloseMessageTooBig, ""), time.Now().Add(writeWait))
+ return noFrame, ErrReadLimit
+ }
+
+ return frameType, nil
+ }
+
+ // 6. Read control frame payload.
+
+ var payload []byte
+ if c.readRemaining > 0 {
+ payload = make([]byte, c.readRemaining)
+ c.readRemaining = 0
+ if err := c.readFull(payload); err != nil {
+ return noFrame, err
+ }
+ if c.isServer {
+ maskBytes(c.readMaskKey, 0, payload)
+ }
+ }
+
+ // 7. Process control frame payload.
+
+ switch frameType {
+ case PongMessage:
+ if err := c.handlePong(string(payload)); err != nil {
+ return noFrame, err
+ }
+ case PingMessage:
+ if err := c.handlePing(string(payload)); err != nil {
+ return noFrame, err
+ }
+ case CloseMessage:
+ c.WriteControl(CloseMessage, []byte{}, time.Now().Add(writeWait))
+ closeCode := CloseNoStatusReceived
+ closeText := ""
+ if len(payload) >= 2 {
+ closeCode = int(binary.BigEndian.Uint16(payload))
+ closeText = string(payload[2:])
+ }
+ return noFrame, &CloseError{Code: closeCode, Text: closeText}
+ }
+
+ return frameType, nil
+}
+
+func (c *Conn) handleProtocolError(message string) error {
+ c.WriteControl(CloseMessage, FormatCloseMessage(CloseProtocolError, message), time.Now().Add(writeWait))
+ return errors.New("websocket: " + message)
+}
+
+// NextReader returns the next data message received from the peer. The
+// returned messageType is either TextMessage or BinaryMessage.
+//
+// There can be at most one open reader on a connection. NextReader discards
+// the previous message if the application has not already consumed it.
+//
+// The NextReader method and the readers returned from the method cannot be
+// accessed by more than one goroutine at a time.
+func (c *Conn) NextReader() (messageType int, r io.Reader, err error) {
+
+ c.readSeq++
+ c.readLength = 0
+
+ for c.readErr == nil {
+ frameType, err := c.advanceFrame()
+ if err != nil {
+ c.readErr = hideTempErr(err)
+ break
+ }
+ if frameType == TextMessage || frameType == BinaryMessage {
+ return frameType, messageReader{c, c.readSeq}, nil
+ }
+ }
+ return noFrame, nil, c.readErr
+}
+
+type messageReader struct {
+ c *Conn
+ seq int
+}
+
+func (r messageReader) Read(b []byte) (int, error) {
+
+ if r.seq != r.c.readSeq {
+ return 0, io.EOF
+ }
+
+ for r.c.readErr == nil {
+
+ if r.c.readRemaining > 0 {
+ if int64(len(b)) > r.c.readRemaining {
+ b = b[:r.c.readRemaining]
+ }
+ n, err := r.c.br.Read(b)
+ r.c.readErr = hideTempErr(err)
+ if r.c.isServer {
+ r.c.readMaskPos = maskBytes(r.c.readMaskKey, r.c.readMaskPos, b[:n])
+ }
+ r.c.readRemaining -= int64(n)
+ return n, r.c.readErr
+ }
+
+ if r.c.readFinal {
+ r.c.readSeq++
+ return 0, io.EOF
+ }
+
+ frameType, err := r.c.advanceFrame()
+ switch {
+ case err != nil:
+ r.c.readErr = hideTempErr(err)
+ case frameType == TextMessage || frameType == BinaryMessage:
+ r.c.readErr = errors.New("websocket: internal error, unexpected text or binary in Reader")
+ }
+ }
+
+ err := r.c.readErr
+ if err == io.EOF && r.seq == r.c.readSeq {
+ err = errUnexpectedEOF
+ }
+ return 0, err
+}
+
+// ReadMessage is a helper method for getting a reader using NextReader and
+// reading from that reader to a buffer.
+func (c *Conn) ReadMessage() (messageType int, p []byte, err error) {
+ var r io.Reader
+ messageType, r, err = c.NextReader()
+ if err != nil {
+ return messageType, nil, err
+ }
+ p, err = ioutil.ReadAll(r)
+ return messageType, p, err
+}
+
+// SetReadDeadline sets the read deadline on the underlying network connection.
+// After a read has timed out, the websocket connection state is corrupt and
+// all future reads will return an error. A zero value for t means reads will
+// not time out.
+func (c *Conn) SetReadDeadline(t time.Time) error {
+ return c.conn.SetReadDeadline(t)
+}
+
+// SetReadLimit sets the maximum size for a message read from the peer. If a
+// message exceeds the limit, the connection sends a close frame to the peer
+// and returns ErrReadLimit to the application.
+func (c *Conn) SetReadLimit(limit int64) {
+ c.readLimit = limit
+}
+
+// SetPingHandler sets the handler for ping messages received from the peer.
+// The default ping handler sends a pong to the peer.
+func (c *Conn) SetPingHandler(h func(string) error) {
+ if h == nil {
+ h = func(message string) error {
+ c.WriteControl(PongMessage, []byte(message), time.Now().Add(writeWait))
+ return nil
+ }
+ }
+ c.handlePing = h
+}
+
+// SetPongHandler sets the handler for pong messages received from the peer.
+// The default pong handler does nothing.
+func (c *Conn) SetPongHandler(h func(string) error) {
+ if h == nil {
+ h = func(string) error { return nil }
+ }
+ c.handlePong = h
+}
+
+// UnderlyingConn returns the internal net.Conn. This can be used to further
+// modifications to connection specific flags.
+func (c *Conn) UnderlyingConn() net.Conn {
+ return c.conn
+}
+
+// FormatCloseMessage formats closeCode and text as a WebSocket close message.
+func FormatCloseMessage(closeCode int, text string) []byte {
+ buf := make([]byte, 2+len(text))
+ binary.BigEndian.PutUint16(buf, uint16(closeCode))
+ copy(buf[2:], text)
+ return buf
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/doc.go b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/doc.go
new file mode 100644
index 000000000..f52925dd1
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/doc.go
@@ -0,0 +1,148 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package websocket implements the WebSocket protocol defined in RFC 6455.
+//
+// Overview
+//
+// The Conn type represents a WebSocket connection. A server application uses
+// the Upgrade function from an Upgrader object with a HTTP request handler
+// to get a pointer to a Conn:
+//
+// var upgrader = websocket.Upgrader{
+// ReadBufferSize: 1024,
+// WriteBufferSize: 1024,
+// }
+//
+// func handler(w http.ResponseWriter, r *http.Request) {
+// conn, err := upgrader.Upgrade(w, r, nil)
+// if err != nil {
+// log.Println(err)
+// return
+// }
+// ... Use conn to send and receive messages.
+// }
+//
+// Call the connection's WriteMessage and ReadMessage methods to send and
+// receive messages as a slice of bytes. This snippet of code shows how to echo
+// messages using these methods:
+//
+// for {
+// messageType, p, err := conn.ReadMessage()
+// if err != nil {
+// return
+// }
+// if err = conn.WriteMessage(messageType, p); err != nil {
+// return err
+// }
+// }
+//
+// In above snippet of code, p is a []byte and messageType is an int with value
+// websocket.BinaryMessage or websocket.TextMessage.
+//
+// An application can also send and receive messages using the io.WriteCloser
+// and io.Reader interfaces. To send a message, call the connection NextWriter
+// method to get an io.WriteCloser, write the message to the writer and close
+// the writer when done. To receive a message, call the connection NextReader
+// method to get an io.Reader and read until io.EOF is returned. This snippet
+// snippet shows how to echo messages using the NextWriter and NextReader
+// methods:
+//
+// for {
+// messageType, r, err := conn.NextReader()
+// if err != nil {
+// return
+// }
+// w, err := conn.NextWriter(messageType)
+// if err != nil {
+// return err
+// }
+// if _, err := io.Copy(w, r); err != nil {
+// return err
+// }
+// if err := w.Close(); err != nil {
+// return err
+// }
+// }
+//
+// Data Messages
+//
+// The WebSocket protocol distinguishes between text and binary data messages.
+// Text messages are interpreted as UTF-8 encoded text. The interpretation of
+// binary messages is left to the application.
+//
+// This package uses the TextMessage and BinaryMessage integer constants to
+// identify the two data message types. The ReadMessage and NextReader methods
+// return the type of the received message. The messageType argument to the
+// WriteMessage and NextWriter methods specifies the type of a sent message.
+//
+// It is the application's responsibility to ensure that text messages are
+// valid UTF-8 encoded text.
+//
+// Control Messages
+//
+// The WebSocket protocol defines three types of control messages: close, ping
+// and pong. Call the connection WriteControl, WriteMessage or NextWriter
+// methods to send a control message to the peer.
+//
+// Connections handle received ping and pong messages by invoking a callback
+// function set with SetPingHandler and SetPongHandler methods. These callback
+// functions can be invoked from the ReadMessage method, the NextReader method
+// or from a call to the data message reader returned from NextReader.
+//
+// Connections handle received close messages by returning an error from the
+// ReadMessage method, the NextReader method or from a call to the data message
+// reader returned from NextReader.
+//
+// Concurrency
+//
+// Connections do not support concurrent calls to the write methods
+// (NextWriter, SetWriteDeadline, WriteMessage) or concurrent calls to the read
+// methods methods (NextReader, SetReadDeadline, ReadMessage). Connections do
+// support a concurrent reader and writer.
+//
+// The Close and WriteControl methods can be called concurrently with all other
+// methods.
+//
+// Read is Required
+//
+// The application must read the connection to process ping and close messages
+// sent from the peer. If the application is not otherwise interested in
+// messages from the peer, then the application should start a goroutine to read
+// and discard messages from the peer. A simple example is:
+//
+// func readLoop(c *websocket.Conn) {
+// for {
+// if _, _, err := c.NextReader(); err != nil {
+// c.Close()
+// break
+// }
+// }
+// }
+//
+// Origin Considerations
+//
+// Web browsers allow Javascript applications to open a WebSocket connection to
+// any host. It's up to the server to enforce an origin policy using the Origin
+// request header sent by the browser.
+//
+// The Upgrader calls the function specified in the CheckOrigin field to check
+// the origin. If the CheckOrigin function returns false, then the Upgrade
+// method fails the WebSocket handshake with HTTP status 403.
+//
+// If the CheckOrigin field is nil, then the Upgrader uses a safe default: fail
+// the handshake if the Origin request header is present and not equal to the
+// Host request header.
+//
+// An application can allow connections from any origin by specifying a
+// function that always returns true:
+//
+// var upgrader = websocket.Upgrader{
+// CheckOrigin: func(r *http.Request) bool { return true },
+// }
+//
+// The deprecated Upgrade function does not enforce an origin policy. It's the
+// application's responsibility to check the Origin header before calling
+// Upgrade.
+package websocket
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/json.go b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/json.go
new file mode 100644
index 000000000..4f0e36875
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/json.go
@@ -0,0 +1,55 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+ "encoding/json"
+ "io"
+)
+
+// WriteJSON is deprecated, use c.WriteJSON instead.
+func WriteJSON(c *Conn, v interface{}) error {
+ return c.WriteJSON(v)
+}
+
+// WriteJSON writes the JSON encoding of v to the connection.
+//
+// See the documentation for encoding/json Marshal for details about the
+// conversion of Go values to JSON.
+func (c *Conn) WriteJSON(v interface{}) error {
+ w, err := c.NextWriter(TextMessage)
+ if err != nil {
+ return err
+ }
+ err1 := json.NewEncoder(w).Encode(v)
+ err2 := w.Close()
+ if err1 != nil {
+ return err1
+ }
+ return err2
+}
+
+// ReadJSON is deprecated, use c.ReadJSON instead.
+func ReadJSON(c *Conn, v interface{}) error {
+ return c.ReadJSON(v)
+}
+
+// ReadJSON reads the next JSON-encoded message from the connection and stores
+// it in the value pointed to by v.
+//
+// See the documentation for the encoding/json Unmarshal function for details
+// about the conversion of JSON to a Go value.
+func (c *Conn) ReadJSON(v interface{}) error {
+ _, r, err := c.NextReader()
+ if err != nil {
+ return err
+ }
+ err = json.NewDecoder(r).Decode(v)
+ if err == io.EOF {
+ // One value is expected in the message.
+ err = io.ErrUnexpectedEOF
+ }
+ return err
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/server.go b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/server.go
new file mode 100644
index 000000000..e56a00493
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/server.go
@@ -0,0 +1,247 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+ "bufio"
+ "errors"
+ "net"
+ "net/http"
+ "net/url"
+ "strings"
+ "time"
+)
+
+// HandshakeError describes an error with the handshake from the peer.
+type HandshakeError struct {
+ message string
+}
+
+func (e HandshakeError) Error() string { return e.message }
+
+// Upgrader specifies parameters for upgrading an HTTP connection to a
+// WebSocket connection.
+type Upgrader struct {
+ // HandshakeTimeout specifies the duration for the handshake to complete.
+ HandshakeTimeout time.Duration
+
+ // ReadBufferSize and WriteBufferSize specify I/O buffer sizes. If a buffer
+ // size is zero, then a default value of 4096 is used. The I/O buffer sizes
+ // do not limit the size of the messages that can be sent or received.
+ ReadBufferSize, WriteBufferSize int
+
+ // Subprotocols specifies the server's supported protocols in order of
+ // preference. If this field is set, then the Upgrade method negotiates a
+ // subprotocol by selecting the first match in this list with a protocol
+ // requested by the client.
+ Subprotocols []string
+
+ // Error specifies the function for generating HTTP error responses. If Error
+ // is nil, then http.Error is used to generate the HTTP response.
+ Error func(w http.ResponseWriter, r *http.Request, status int, reason error)
+
+ // CheckOrigin returns true if the request Origin header is acceptable. If
+ // CheckOrigin is nil, the host in the Origin header must not be set or
+ // must match the host of the request.
+ CheckOrigin func(r *http.Request) bool
+}
+
+func (u *Upgrader) returnError(w http.ResponseWriter, r *http.Request, status int, reason string) (*Conn, error) {
+ err := HandshakeError{reason}
+ if u.Error != nil {
+ u.Error(w, r, status, err)
+ } else {
+ http.Error(w, http.StatusText(status), status)
+ }
+ return nil, err
+}
+
+// checkSameOrigin returns true if the origin is not set or is equal to the request host.
+func checkSameOrigin(r *http.Request) bool {
+ origin := r.Header["Origin"]
+ if len(origin) == 0 {
+ return true
+ }
+ u, err := url.Parse(origin[0])
+ if err != nil {
+ return false
+ }
+ return u.Host == r.Host
+}
+
+func (u *Upgrader) selectSubprotocol(r *http.Request, responseHeader http.Header) string {
+ if u.Subprotocols != nil {
+ clientProtocols := Subprotocols(r)
+ for _, serverProtocol := range u.Subprotocols {
+ for _, clientProtocol := range clientProtocols {
+ if clientProtocol == serverProtocol {
+ return clientProtocol
+ }
+ }
+ }
+ } else if responseHeader != nil {
+ return responseHeader.Get("Sec-Websocket-Protocol")
+ }
+ return ""
+}
+
+// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
+//
+// The responseHeader is included in the response to the client's upgrade
+// request. Use the responseHeader to specify cookies (Set-Cookie) and the
+// application negotiated subprotocol (Sec-Websocket-Protocol).
+func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header) (*Conn, error) {
+ if values := r.Header["Sec-Websocket-Version"]; len(values) == 0 || values[0] != "13" {
+ return u.returnError(w, r, http.StatusBadRequest, "websocket: version != 13")
+ }
+
+ if !tokenListContainsValue(r.Header, "Connection", "upgrade") {
+ return u.returnError(w, r, http.StatusBadRequest, "websocket: could not find connection header with token 'upgrade'")
+ }
+
+ if !tokenListContainsValue(r.Header, "Upgrade", "websocket") {
+ return u.returnError(w, r, http.StatusBadRequest, "websocket: could not find upgrade header with token 'websocket'")
+ }
+
+ checkOrigin := u.CheckOrigin
+ if checkOrigin == nil {
+ checkOrigin = checkSameOrigin
+ }
+ if !checkOrigin(r) {
+ return u.returnError(w, r, http.StatusForbidden, "websocket: origin not allowed")
+ }
+
+ challengeKey := r.Header.Get("Sec-Websocket-Key")
+ if challengeKey == "" {
+ return u.returnError(w, r, http.StatusBadRequest, "websocket: key missing or blank")
+ }
+
+ subprotocol := u.selectSubprotocol(r, responseHeader)
+
+ var (
+ netConn net.Conn
+ br *bufio.Reader
+ err error
+ )
+
+ h, ok := w.(http.Hijacker)
+ if !ok {
+ return u.returnError(w, r, http.StatusInternalServerError, "websocket: response does not implement http.Hijacker")
+ }
+ var rw *bufio.ReadWriter
+ netConn, rw, err = h.Hijack()
+ if err != nil {
+ return u.returnError(w, r, http.StatusInternalServerError, err.Error())
+ }
+ br = rw.Reader
+
+ if br.Buffered() > 0 {
+ netConn.Close()
+ return nil, errors.New("websocket: client sent data before handshake is complete")
+ }
+
+ c := newConn(netConn, true, u.ReadBufferSize, u.WriteBufferSize)
+ c.subprotocol = subprotocol
+
+ p := c.writeBuf[:0]
+ p = append(p, "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: "...)
+ p = append(p, computeAcceptKey(challengeKey)...)
+ p = append(p, "\r\n"...)
+ if c.subprotocol != "" {
+ p = append(p, "Sec-Websocket-Protocol: "...)
+ p = append(p, c.subprotocol...)
+ p = append(p, "\r\n"...)
+ }
+ for k, vs := range responseHeader {
+ if k == "Sec-Websocket-Protocol" {
+ continue
+ }
+ for _, v := range vs {
+ p = append(p, k...)
+ p = append(p, ": "...)
+ for i := 0; i < len(v); i++ {
+ b := v[i]
+ if b <= 31 {
+ // prevent response splitting.
+ b = ' '
+ }
+ p = append(p, b)
+ }
+ p = append(p, "\r\n"...)
+ }
+ }
+ p = append(p, "\r\n"...)
+
+ // Clear deadlines set by HTTP server.
+ netConn.SetDeadline(time.Time{})
+
+ if u.HandshakeTimeout > 0 {
+ netConn.SetWriteDeadline(time.Now().Add(u.HandshakeTimeout))
+ }
+ if _, err = netConn.Write(p); err != nil {
+ netConn.Close()
+ return nil, err
+ }
+ if u.HandshakeTimeout > 0 {
+ netConn.SetWriteDeadline(time.Time{})
+ }
+
+ return c, nil
+}
+
+// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
+//
+// This function is deprecated, use websocket.Upgrader instead.
+//
+// The application is responsible for checking the request origin before
+// calling Upgrade. An example implementation of the same origin policy is:
+//
+// if req.Header.Get("Origin") != "http://"+req.Host {
+// http.Error(w, "Origin not allowed", 403)
+// return
+// }
+//
+// If the endpoint supports subprotocols, then the application is responsible
+// for negotiating the protocol used on the connection. Use the Subprotocols()
+// function to get the subprotocols requested by the client. Use the
+// Sec-Websocket-Protocol response header to specify the subprotocol selected
+// by the application.
+//
+// The responseHeader is included in the response to the client's upgrade
+// request. Use the responseHeader to specify cookies (Set-Cookie) and the
+// negotiated subprotocol (Sec-Websocket-Protocol).
+//
+// The connection buffers IO to the underlying network connection. The
+// readBufSize and writeBufSize parameters specify the size of the buffers to
+// use. Messages can be larger than the buffers.
+//
+// If the request is not a valid WebSocket handshake, then Upgrade returns an
+// error of type HandshakeError. Applications should handle this error by
+// replying to the client with an HTTP error response.
+func Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header, readBufSize, writeBufSize int) (*Conn, error) {
+ u := Upgrader{ReadBufferSize: readBufSize, WriteBufferSize: writeBufSize}
+ u.Error = func(w http.ResponseWriter, r *http.Request, status int, reason error) {
+ // don't return errors to maintain backwards compatibility
+ }
+ u.CheckOrigin = func(r *http.Request) bool {
+ // allow all connections by default
+ return true
+ }
+ return u.Upgrade(w, r, responseHeader)
+}
+
+// Subprotocols returns the subprotocols requested by the client in the
+// Sec-Websocket-Protocol header.
+func Subprotocols(r *http.Request) []string {
+ h := strings.TrimSpace(r.Header.Get("Sec-Websocket-Protocol"))
+ if h == "" {
+ return nil
+ }
+ protocols := strings.Split(h, ",")
+ for i := range protocols {
+ protocols[i] = strings.TrimSpace(protocols[i])
+ }
+ return protocols
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/util.go b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/util.go
new file mode 100644
index 000000000..ffdc265ed
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/gorilla/websocket/util.go
@@ -0,0 +1,44 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+ "crypto/rand"
+ "crypto/sha1"
+ "encoding/base64"
+ "io"
+ "net/http"
+ "strings"
+)
+
+// tokenListContainsValue returns true if the 1#token header with the given
+// name contains token.
+func tokenListContainsValue(header http.Header, name string, value string) bool {
+ for _, v := range header[name] {
+ for _, s := range strings.Split(v, ",") {
+ if strings.EqualFold(value, strings.TrimSpace(s)) {
+ return true
+ }
+ }
+ }
+ return false
+}
+
+var keyGUID = []byte("258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
+
+func computeAcceptKey(challengeKey string) string {
+ h := sha1.New()
+ h.Write([]byte(challengeKey))
+ h.Write(keyGUID)
+ return base64.StdEncoding.EncodeToString(h.Sum(nil))
+}
+
+func generateChallengeKey() (string, error) {
+ p := make([]byte, 16)
+ if _, err := io.ReadFull(rand.Reader, p); err != nil {
+ return "", err
+ }
+ return base64.StdEncoding.EncodeToString(p), nil
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/LICENSE b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/LICENSE
new file mode 100644
index 000000000..82b4de97c
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/LICENSE
@@ -0,0 +1,353 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+ means each individual or legal entity that creates, contributes to the
+ creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+ means the combination of the Contributions of others (if any) used by a
+ Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+ means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+ means Source Code Form to which the initial Contributor has attached the
+ notice in Exhibit A, the Executable Form of such Source Code Form, and
+ Modifications of such Source Code Form, in each case including portions
+ thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+ means
+
+ a. that the initial Contributor has attached the notice described in
+ Exhibit B to the Covered Software; or
+
+ b. that the Covered Software was made available under the terms of version
+ 1.1 or earlier of the License, but not also under the terms of a
+ Secondary License.
+
+1.6. “Executable Form”
+
+ means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+ means a work that combines Covered Software with other material, in a separate
+ file or files, that is not Covered Software.
+
+1.8. “License”
+
+ means this document.
+
+1.9. “Licensable”
+
+ means having the right to grant, to the maximum extent possible, whether at the
+ time of the initial grant or subsequently, any and all of the rights conveyed by
+ this License.
+
+1.10. “Modifications”
+
+ means any of the following:
+
+ a. any file in Source Code Form that results from an addition to, deletion
+ from, or modification of the contents of Covered Software; or
+
+ b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+ means any patent claim(s), including without limitation, method, process,
+ and apparatus claims, in any patent Licensable by such Contributor that
+ would be infringed, but for the grant of the License, by the making,
+ using, selling, offering for sale, having made, import, or transfer of
+ either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+ means either the GNU General Public License, Version 2.0, the GNU Lesser
+ General Public License, Version 2.1, the GNU Affero General Public
+ License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+ means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+ means an individual or a legal entity exercising rights under this
+ License. For legal entities, “You” includes any entity that controls, is
+ controlled by, or is under common control with You. For purposes of this
+ definition, “control” means (a) the power, direct or indirect, to cause
+ the direction or management of such entity, whether by contract or
+ otherwise, or (b) ownership of more than fifty percent (50%) of the
+ outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+ Each Contributor hereby grants You a world-wide, royalty-free,
+ non-exclusive license:
+
+ a. under intellectual property rights (other than patent or trademark)
+ Licensable by such Contributor to use, reproduce, make available,
+ modify, display, perform, distribute, and otherwise exploit its
+ Contributions, either on an unmodified basis, with Modifications, or as
+ part of a Larger Work; and
+
+ b. under Patent Claims of such Contributor to make, use, sell, offer for
+ sale, have made, import, and otherwise transfer either its Contributions
+ or its Contributor Version.
+
+2.2. Effective Date
+
+ The licenses granted in Section 2.1 with respect to any Contribution become
+ effective for each Contribution on the date the Contributor first distributes
+ such Contribution.
+
+2.3. Limitations on Grant Scope
+
+ The licenses granted in this Section 2 are the only rights granted under this
+ License. No additional rights or licenses will be implied from the distribution
+ or licensing of Covered Software under this License. Notwithstanding Section
+ 2.1(b) above, no patent license is granted by a Contributor:
+
+ a. for any code that a Contributor has removed from Covered Software; or
+
+ b. for infringements caused by: (i) Your and any other third party’s
+ modifications of Covered Software, or (ii) the combination of its
+ Contributions with other software (except as part of its Contributor
+ Version); or
+
+ c. under Patent Claims infringed by Covered Software in the absence of its
+ Contributions.
+
+ This License does not grant any rights in the trademarks, service marks, or
+ logos of any Contributor (except as may be necessary to comply with the
+ notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+ No Contributor makes additional grants as a result of Your choice to
+ distribute the Covered Software under a subsequent version of this License
+ (see Section 10.2) or under the terms of a Secondary License (if permitted
+ under the terms of Section 3.3).
+
+2.5. Representation
+
+ Each Contributor represents that the Contributor believes its Contributions
+ are its original creation(s) or it has sufficient rights to grant the
+ rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+ This License is not intended to limit any rights You have under applicable
+ copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+ Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+ Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+ All distribution of Covered Software in Source Code Form, including any
+ Modifications that You create or to which You contribute, must be under the
+ terms of this License. You must inform recipients that the Source Code Form
+ of the Covered Software is governed by the terms of this License, and how
+ they can obtain a copy of this License. You may not attempt to alter or
+ restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+ If You distribute Covered Software in Executable Form then:
+
+ a. such Covered Software must also be made available in Source Code Form,
+ as described in Section 3.1, and You must inform recipients of the
+ Executable Form how they can obtain a copy of such Source Code Form by
+ reasonable means in a timely manner, at a charge no more than the cost
+ of distribution to the recipient; and
+
+ b. You may distribute such Executable Form under the terms of this License,
+ or sublicense it under different terms, provided that the license for
+ the Executable Form does not attempt to limit or alter the recipients’
+ rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+ You may create and distribute a Larger Work under terms of Your choice,
+ provided that You also comply with the requirements of this License for the
+ Covered Software. If the Larger Work is a combination of Covered Software
+ with a work governed by one or more Secondary Licenses, and the Covered
+ Software is not Incompatible With Secondary Licenses, this License permits
+ You to additionally distribute such Covered Software under the terms of
+ such Secondary License(s), so that the recipient of the Larger Work may, at
+ their option, further distribute the Covered Software under the terms of
+ either this License or such Secondary License(s).
+
+3.4. Notices
+
+ You may not remove or alter the substance of any license notices (including
+ copyright notices, patent notices, disclaimers of warranty, or limitations
+ of liability) contained within the Source Code Form of the Covered
+ Software, except that You may alter any license notices to the extent
+ required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+ You may choose to offer, and to charge a fee for, warranty, support,
+ indemnity or liability obligations to one or more recipients of Covered
+ Software. However, You may do so only on Your own behalf, and not on behalf
+ of any Contributor. You must make it absolutely clear that any such
+ warranty, support, indemnity, or liability obligation is offered by You
+ alone, and You hereby agree to indemnify every Contributor for any
+ liability incurred by such Contributor as a result of warranty, support,
+ indemnity or liability terms You offer. You may include additional
+ disclaimers of warranty and limitations of liability specific to any
+ jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+ If it is impossible for You to comply with any of the terms of this License
+ with respect to some or all of the Covered Software due to statute, judicial
+ order, or regulation then You must: (a) comply with the terms of this License
+ to the maximum extent possible; and (b) describe the limitations and the code
+ they affect. Such description must be placed in a text file included with all
+ distributions of the Covered Software under this License. Except to the
+ extent prohibited by statute or regulation, such description must be
+ sufficiently detailed for a recipient of ordinary skill to be able to
+ understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+ fail to comply with any of its terms. However, if You become compliant,
+ then the rights granted under this License from a particular Contributor
+ are reinstated (a) provisionally, unless and until such Contributor
+ explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+ if such Contributor fails to notify You of the non-compliance by some
+ reasonable means prior to 60 days after You have come back into compliance.
+ Moreover, Your grants from a particular Contributor are reinstated on an
+ ongoing basis if such Contributor notifies You of the non-compliance by
+ some reasonable means, this is the first time You have received notice of
+ non-compliance with this License from such Contributor, and You become
+ compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+ infringement claim (excluding declaratory judgment actions, counter-claims,
+ and cross-claims) alleging that a Contributor Version directly or
+ indirectly infringes any patent, then the rights granted to You by any and
+ all Contributors for the Covered Software under Section 2.1 of this License
+ shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+ license agreements (excluding distributors and resellers) which have been
+ validly granted by You or Your distributors under this License prior to
+ termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+ Covered Software is provided under this License on an “as is” basis, without
+ warranty of any kind, either expressed, implied, or statutory, including,
+ without limitation, warranties that the Covered Software is free of defects,
+ merchantable, fit for a particular purpose or non-infringing. The entire
+ risk as to the quality and performance of the Covered Software is with You.
+ Should any Covered Software prove defective in any respect, You (not any
+ Contributor) assume the cost of any necessary servicing, repair, or
+ correction. This disclaimer of warranty constitutes an essential part of this
+ License. No use of any Covered Software is authorized under this License
+ except under this disclaimer.
+
+7. Limitation of Liability
+
+ Under no circumstances and under no legal theory, whether tort (including
+ negligence), contract, or otherwise, shall any Contributor, or anyone who
+ distributes Covered Software as permitted above, be liable to You for any
+ direct, indirect, special, incidental, or consequential damages of any
+ character including, without limitation, damages for lost profits, loss of
+ goodwill, work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses, even if such party shall have been
+ informed of the possibility of such damages. This limitation of liability
+ shall not apply to liability for death or personal injury resulting from such
+ party’s negligence to the extent applicable law prohibits such limitation.
+ Some jurisdictions do not allow the exclusion or limitation of incidental or
+ consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+ Any litigation relating to this License may be brought only in the courts of
+ a jurisdiction where the defendant maintains its principal place of business
+ and such litigation shall be governed by laws of that jurisdiction, without
+ reference to its conflict-of-law provisions. Nothing in this Section shall
+ prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+ This License represents the complete agreement concerning the subject matter
+ hereof. If any provision of this License is held to be unenforceable, such
+ provision shall be reformed only to the extent necessary to make it
+ enforceable. Any law or regulation which provides that the language of a
+ contract shall be construed against the drafter shall not be used to construe
+ this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+ Mozilla Foundation is the license steward. Except as provided in Section
+ 10.3, no one other than the license steward has the right to modify or
+ publish new versions of this License. Each version will be given a
+ distinguishing version number.
+
+10.2. Effect of New Versions
+
+ You may distribute the Covered Software under the terms of the version of
+ the License under which You originally received the Covered Software, or
+ under the terms of any subsequent version published by the license
+ steward.
+
+10.3. Modified Versions
+
+ If you create software not governed by this License, and you want to
+ create a new license for such software, you may create and use a modified
+ version of this License if you rename the license and remove any
+ references to the name of the license steward (except to note that such
+ modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+ If You choose to distribute Source Code Form that is Incompatible With
+ Secondary Licenses under the terms of this version of the License, the
+ notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+ This Source Code Form is subject to the
+ terms of the Mozilla Public License, v.
+ 2.0. If a copy of the MPL was not
+ distributed with this file, You can
+ obtain one at
+ http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+ This Source Code Form is “Incompatible
+ With Secondary Licenses”, as defined by
+ the Mozilla Public License, v. 2.0.
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/README.md b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/README.md
new file mode 100644
index 000000000..e81be50e0
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/README.md
@@ -0,0 +1,91 @@
+# go-multierror
+
+`go-multierror` is a package for Go that provides a mechanism for
+representing a list of `error` values as a single `error`.
+
+This allows a function in Go to return an `error` that might actually
+be a list of errors. If the caller knows this, they can unwrap the
+list and access the errors. If the caller doesn't know, the error
+formats to a nice human-readable format.
+
+`go-multierror` implements the
+[errwrap](https://github.com/hashicorp/errwrap) interface so that it can
+be used with that library, as well.
+
+## Installation and Docs
+
+Install using `go get github.com/hashicorp/go-multierror`.
+
+Full documentation is available at
+http://godoc.org/github.com/hashicorp/go-multierror
+
+## Usage
+
+go-multierror is easy to use and purposely built to be unobtrusive in
+existing Go applications/libraries that may not be aware of it.
+
+**Building a list of errors**
+
+The `Append` function is used to create a list of errors. This function
+behaves a lot like the Go built-in `append` function: it doesn't matter
+if the first argument is nil, a `multierror.Error`, or any other `error`,
+the function behaves as you would expect.
+
+```go
+var result error
+
+if err := step1(); err != nil {
+ result = multierror.Append(result, err)
+}
+if err := step2(); err != nil {
+ result = multierror.Append(result, err)
+}
+
+return result
+```
+
+**Customizing the formatting of the errors**
+
+By specifying a custom `ErrorFormat`, you can customize the format
+of the `Error() string` function:
+
+```go
+var result *multierror.Error
+
+// ... accumulate errors here, maybe using Append
+
+if result != nil {
+ result.ErrorFormat = func([]error) string {
+ return "errors!"
+ }
+}
+```
+
+**Accessing the list of errors**
+
+`multierror.Error` implements `error` so if the caller doesn't know about
+multierror, it will work just fine. But if you're aware a multierror might
+be returned, you can use type switches to access the list of errors:
+
+```go
+if err := something(); err != nil {
+ if merr, ok := err.(*multierror.Error); ok {
+ // Use merr.Errors
+ }
+}
+```
+
+**Returning a multierror only if there are errors**
+
+If you build a `multierror.Error`, you can use the `ErrorOrNil` function
+to return an `error` implementation only if there are errors to return:
+
+```go
+var result *multierror.Error
+
+// ... accumulate errors here
+
+// Return the `error` only if errors were added to the multierror, otherwise
+// return nil since there are no errors.
+return result.ErrorOrNil()
+```
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/append.go b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/append.go
new file mode 100644
index 000000000..8d22ee7a0
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/append.go
@@ -0,0 +1,30 @@
+package multierror
+
+// Append is a helper function that will append more errors
+// onto an Error in order to create a larger multi-error.
+//
+// If err is not a multierror.Error, then it will be turned into
+// one. If any of the errs are multierr.Error, they will be flattened
+// one level into err.
+func Append(err error, errs ...error) *Error {
+ switch err := err.(type) {
+ case *Error:
+ // Typed nils can reach here, so initialize if we are nil
+ if err == nil {
+ err = new(Error)
+ }
+
+ err.Errors = append(err.Errors, errs...)
+ return err
+ default:
+ newErrs := make([]error, 0, len(errs)+1)
+ if err != nil {
+ newErrs = append(newErrs, err)
+ }
+ newErrs = append(newErrs, errs...)
+
+ return &Error{
+ Errors: newErrs,
+ }
+ }
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/flatten.go b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/flatten.go
new file mode 100644
index 000000000..aab8e9abe
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/flatten.go
@@ -0,0 +1,26 @@
+package multierror
+
+// Flatten flattens the given error, merging any *Errors together into
+// a single *Error.
+func Flatten(err error) error {
+ // If it isn't an *Error, just return the error as-is
+ if _, ok := err.(*Error); !ok {
+ return err
+ }
+
+ // Otherwise, make the result and flatten away!
+ flatErr := new(Error)
+ flatten(err, flatErr)
+ return flatErr
+}
+
+func flatten(err error, flatErr *Error) {
+ switch err := err.(type) {
+ case *Error:
+ for _, e := range err.Errors {
+ flatten(e, flatErr)
+ }
+ default:
+ flatErr.Errors = append(flatErr.Errors, err)
+ }
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/format.go b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/format.go
new file mode 100644
index 000000000..bb65a12e7
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/format.go
@@ -0,0 +1,23 @@
+package multierror
+
+import (
+ "fmt"
+ "strings"
+)
+
+// ErrorFormatFunc is a function callback that is called by Error to
+// turn the list of errors into a string.
+type ErrorFormatFunc func([]error) string
+
+// ListFormatFunc is a basic formatter that outputs the number of errors
+// that occurred along with a bullet point list of the errors.
+func ListFormatFunc(es []error) string {
+ points := make([]string, len(es))
+ for i, err := range es {
+ points[i] = fmt.Sprintf("* %s", err)
+ }
+
+ return fmt.Sprintf(
+ "%d error(s) occurred:\n\n%s",
+ len(es), strings.Join(points, "\n"))
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/multierror.go b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/multierror.go
new file mode 100644
index 000000000..2ea082732
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/hashicorp/go-multierror/multierror.go
@@ -0,0 +1,51 @@
+package multierror
+
+import (
+ "fmt"
+)
+
+// Error is an error type to track multiple errors. This is used to
+// accumulate errors in cases and return them as a single "error".
+type Error struct {
+ Errors []error
+ ErrorFormat ErrorFormatFunc
+}
+
+func (e *Error) Error() string {
+ fn := e.ErrorFormat
+ if fn == nil {
+ fn = ListFormatFunc
+ }
+
+ return fn(e.Errors)
+}
+
+// ErrorOrNil returns an error interface if this Error represents
+// a list of errors, or returns nil if the list of errors is empty. This
+// function is useful at the end of accumulation to make sure that the value
+// returned represents the existence of errors.
+func (e *Error) ErrorOrNil() error {
+ if e == nil {
+ return nil
+ }
+ if len(e.Errors) == 0 {
+ return nil
+ }
+
+ return e
+}
+
+func (e *Error) GoString() string {
+ return fmt.Sprintf("*%#v", *e)
+}
+
+// WrappedErrors returns the list of errors that this Error is wrapping.
+// It is an implementatin of the errwrap.Wrapper interface so that
+// multierror.Error can be used with that library.
+//
+// This method is not safe to be called concurrently and is no different
+// than accessing the Errors field directly. It is implementd only to
+// satisfy the errwrap.Wrapper interface.
+func (e *Error) WrappedErrors() []error {
+ return e.Errors
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/.gitignore b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/.gitignore
new file mode 100644
index 000000000..1f0a99f2f
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/.gitignore
@@ -0,0 +1,4 @@
+[568].out
+_go*
+_test*
+_obj
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/License b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/License
new file mode 100644
index 000000000..6b7558b6b
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/License
@@ -0,0 +1,23 @@
+Copyright (c) 2011 Keith Rarick
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall
+be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/README.md b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/README.md
new file mode 100644
index 000000000..7b7900c3a
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/README.md
@@ -0,0 +1,36 @@
+# pty
+
+Pty is a Go package for using unix pseudo-terminals.
+
+## Install
+
+ go get github.com/kr/pty
+
+## Example
+
+```go
+package main
+
+import (
+ "github.com/kr/pty"
+ "io"
+ "os"
+ "os/exec"
+)
+
+func main() {
+ c := exec.Command("grep", "--color=auto", "bar")
+ f, err := pty.Start(c)
+ if err != nil {
+ panic(err)
+ }
+
+ go func() {
+ f.Write([]byte("foo\n"))
+ f.Write([]byte("bar\n"))
+ f.Write([]byte("baz\n"))
+ f.Write([]byte{4}) // EOT
+ }()
+ io.Copy(os.Stdout, f)
+}
+```
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/doc.go b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/doc.go
new file mode 100644
index 000000000..190cfbea9
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/doc.go
@@ -0,0 +1,16 @@
+// Package pty provides functions for working with Unix terminals.
+package pty
+
+import (
+ "errors"
+ "os"
+)
+
+// ErrUnsupported is returned if a function is not
+// available on the current platform.
+var ErrUnsupported = errors.New("unsupported")
+
+// Opens a pty and its corresponding tty.
+func Open() (pty, tty *os.File, err error) {
+ return open()
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/ioctl.go b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/ioctl.go
new file mode 100644
index 000000000..5b856e871
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/ioctl.go
@@ -0,0 +1,11 @@
+package pty
+
+import "syscall"
+
+func ioctl(fd, cmd, ptr uintptr) error {
+ _, _, e := syscall.Syscall(syscall.SYS_IOCTL, fd, cmd, ptr)
+ if e != 0 {
+ return e
+ }
+ return nil
+}
diff --git a/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/ioctl_bsd.go b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/ioctl_bsd.go
new file mode 100644
index 000000000..73b12c53c
--- /dev/null
+++ b/vendor/github.com/yudai/gotty/vendor/github.com/kr/pty/ioctl_bsd.go
@@ -0,0 +1,39 @@
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package pty
+
+// from