author | Mikael Berthe <mikael@lilotux.net> |
Mon, 07 Jun 2021 20:58:18 +0200 | |
changeset 255 | 4f153a23adab |
parent 251 | 1c52a0eeb952 |
child 260 | 445e01aede7e |
permissions | -rw-r--r-- |
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1 |
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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3 |
// license that can be found in the LICENSE file. |
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4 |
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5 |
package websocket |
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import ( |
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"bufio" |
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"errors" |
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"io" |
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"net/http" |
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"net/url" |
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"strings" |
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"time" |
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15 |
) |
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16 |
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// HandshakeError describes an error with the handshake from the peer. |
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type HandshakeError struct { |
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message string |
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20 |
} |
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21 |
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func (e HandshakeError) Error() string { return e.message } |
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23 |
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// Upgrader specifies parameters for upgrading an HTTP connection to a |
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// WebSocket connection. |
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type Upgrader struct { |
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// HandshakeTimeout specifies the duration for the handshake to complete. |
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HandshakeTimeout time.Duration |
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251 | 30 |
// ReadBufferSize and WriteBufferSize specify I/O buffer sizes in bytes. If a buffer |
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// size is zero, then buffers allocated by the HTTP server are used. The |
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// I/O buffer sizes do not limit the size of the messages that can be sent |
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// or received. |
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ReadBufferSize, WriteBufferSize int |
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// WriteBufferPool is a pool of buffers for write operations. If the value |
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// is not set, then write buffers are allocated to the connection for the |
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// lifetime of the connection. |
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// |
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// A pool is most useful when the application has a modest volume of writes |
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// across a large number of connections. |
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// |
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// Applications should use a single pool for each unique value of |
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// WriteBufferSize. |
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45 |
WriteBufferPool BufferPool |
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46 |
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// Subprotocols specifies the server's supported protocols in order of |
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// preference. If this field is not nil, then the Upgrade method negotiates a |
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// subprotocol by selecting the first match in this list with a protocol |
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// requested by the client. If there's no match, then no protocol is |
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// negotiated (the Sec-Websocket-Protocol header is not included in the |
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52 |
// handshake response). |
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53 |
Subprotocols []string |
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54 |
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// Error specifies the function for generating HTTP error responses. If Error |
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// is nil, then http.Error is used to generate the HTTP response. |
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57 |
Error func(w http.ResponseWriter, r *http.Request, status int, reason error) |
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58 |
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// CheckOrigin returns true if the request Origin header is acceptable. If |
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// CheckOrigin is nil, then a safe default is used: return false if the |
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// Origin request header is present and the origin host is not equal to |
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// request Host header. |
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// |
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64 |
// A CheckOrigin function should carefully validate the request origin to |
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// prevent cross-site request forgery. |
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66 |
CheckOrigin func(r *http.Request) bool |
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67 |
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// EnableCompression specify if the server should attempt to negotiate per |
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69 |
// message compression (RFC 7692). Setting this value to true does not |
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// guarantee that compression will be supported. Currently only "no context |
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// takeover" modes are supported. |
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72 |
EnableCompression bool |
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73 |
} |
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74 |
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func (u *Upgrader) returnError(w http.ResponseWriter, r *http.Request, status int, reason string) (*Conn, error) { |
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76 |
err := HandshakeError{reason} |
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77 |
if u.Error != nil { |
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u.Error(w, r, status, err) |
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} else { |
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80 |
w.Header().Set("Sec-Websocket-Version", "13") |
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http.Error(w, http.StatusText(status), status) |
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82 |
} |
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83 |
return nil, err |
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84 |
} |
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85 |
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86 |
// checkSameOrigin returns true if the origin is not set or is equal to the request host. |
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87 |
func checkSameOrigin(r *http.Request) bool { |
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88 |
origin := r.Header["Origin"] |
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89 |
if len(origin) == 0 { |
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90 |
return true |
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91 |
} |
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92 |
u, err := url.Parse(origin[0]) |
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93 |
if err != nil { |
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94 |
return false |
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95 |
} |
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96 |
return equalASCIIFold(u.Host, r.Host) |
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97 |
} |
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98 |
|
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99 |
func (u *Upgrader) selectSubprotocol(r *http.Request, responseHeader http.Header) string { |
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100 |
if u.Subprotocols != nil { |
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101 |
clientProtocols := Subprotocols(r) |
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102 |
for _, serverProtocol := range u.Subprotocols { |
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103 |
for _, clientProtocol := range clientProtocols { |
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104 |
if clientProtocol == serverProtocol { |
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105 |
return clientProtocol |
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106 |
} |
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107 |
} |
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108 |
} |
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109 |
} else if responseHeader != nil { |
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110 |
return responseHeader.Get("Sec-Websocket-Protocol") |
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111 |
} |
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112 |
return "" |
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113 |
} |
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114 |
|
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115 |
// Upgrade upgrades the HTTP server connection to the WebSocket protocol. |
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116 |
// |
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117 |
// The responseHeader is included in the response to the client's upgrade |
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118 |
// request. Use the responseHeader to specify cookies (Set-Cookie) and the |
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119 |
// application negotiated subprotocol (Sec-WebSocket-Protocol). |
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120 |
// |
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121 |
// If the upgrade fails, then Upgrade replies to the client with an HTTP error |
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122 |
// response. |
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123 |
func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header) (*Conn, error) { |
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124 |
const badHandshake = "websocket: the client is not using the websocket protocol: " |
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|
125 |
|
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126 |
if !tokenListContainsValue(r.Header, "Connection", "upgrade") { |
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127 |
return u.returnError(w, r, http.StatusBadRequest, badHandshake+"'upgrade' token not found in 'Connection' header") |
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|
128 |
} |
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|
129 |
|
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130 |
if !tokenListContainsValue(r.Header, "Upgrade", "websocket") { |
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|
131 |
return u.returnError(w, r, http.StatusBadRequest, badHandshake+"'websocket' token not found in 'Upgrade' header") |
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|
132 |
} |
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|
133 |
|
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|
134 |
if r.Method != "GET" { |
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|
135 |
return u.returnError(w, r, http.StatusMethodNotAllowed, badHandshake+"request method is not GET") |
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|
136 |
} |
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changeset
|
137 |
|
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|
138 |
if !tokenListContainsValue(r.Header, "Sec-Websocket-Version", "13") { |
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|
139 |
return u.returnError(w, r, http.StatusBadRequest, "websocket: unsupported version: 13 not found in 'Sec-Websocket-Version' header") |
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|
140 |
} |
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changeset
|
141 |
|
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|
142 |
if _, ok := responseHeader["Sec-Websocket-Extensions"]; ok { |
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|
143 |
return u.returnError(w, r, http.StatusInternalServerError, "websocket: application specific 'Sec-WebSocket-Extensions' headers are unsupported") |
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|
144 |
} |
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changeset
|
145 |
|
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|
146 |
checkOrigin := u.CheckOrigin |
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|
147 |
if checkOrigin == nil { |
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|
148 |
checkOrigin = checkSameOrigin |
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|
149 |
} |
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|
150 |
if !checkOrigin(r) { |
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|
151 |
return u.returnError(w, r, http.StatusForbidden, "websocket: request origin not allowed by Upgrader.CheckOrigin") |
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|
152 |
} |
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|
153 |
|
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|
154 |
challengeKey := r.Header.Get("Sec-Websocket-Key") |
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changeset
|
155 |
if challengeKey == "" { |
251 | 156 |
return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: 'Sec-WebSocket-Key' header is missing or blank") |
242
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|
157 |
} |
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changeset
|
158 |
|
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changeset
|
159 |
subprotocol := u.selectSubprotocol(r, responseHeader) |
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changeset
|
160 |
|
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|
161 |
// Negotiate PMCE |
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|
162 |
var compress bool |
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changeset
|
163 |
if u.EnableCompression { |
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|
164 |
for _, ext := range parseExtensions(r.Header) { |
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|
165 |
if ext[""] != "permessage-deflate" { |
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|
166 |
continue |
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|
167 |
} |
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changeset
|
168 |
compress = true |
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|
169 |
break |
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changeset
|
170 |
} |
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changeset
|
171 |
} |
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changeset
|
172 |
|
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changeset
|
173 |
h, ok := w.(http.Hijacker) |
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parents:
diff
changeset
|
174 |
if !ok { |
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changeset
|
175 |
return u.returnError(w, r, http.StatusInternalServerError, "websocket: response does not implement http.Hijacker") |
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changeset
|
176 |
} |
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changeset
|
177 |
var brw *bufio.ReadWriter |
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parents:
diff
changeset
|
178 |
netConn, brw, err := h.Hijack() |
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parents:
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|
179 |
if err != nil { |
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diff
changeset
|
180 |
return u.returnError(w, r, http.StatusInternalServerError, err.Error()) |
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parents:
diff
changeset
|
181 |
} |
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diff
changeset
|
182 |
|
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parents:
diff
changeset
|
183 |
if brw.Reader.Buffered() > 0 { |
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parents:
diff
changeset
|
184 |
netConn.Close() |
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parents:
diff
changeset
|
185 |
return nil, errors.New("websocket: client sent data before handshake is complete") |
2a9ec03fe5a1
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parents:
diff
changeset
|
186 |
} |
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parents:
diff
changeset
|
187 |
|
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diff
changeset
|
188 |
var br *bufio.Reader |
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parents:
diff
changeset
|
189 |
if u.ReadBufferSize == 0 && bufioReaderSize(netConn, brw.Reader) > 256 { |
2a9ec03fe5a1
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parents:
diff
changeset
|
190 |
// Reuse hijacked buffered reader as connection reader. |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
191 |
br = brw.Reader |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
192 |
} |
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parents:
diff
changeset
|
193 |
|
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parents:
diff
changeset
|
194 |
buf := bufioWriterBuffer(netConn, brw.Writer) |
2a9ec03fe5a1
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parents:
diff
changeset
|
195 |
|
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parents:
diff
changeset
|
196 |
var writeBuf []byte |
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
197 |
if u.WriteBufferPool == nil && u.WriteBufferSize == 0 && len(buf) >= maxFrameHeaderSize+256 { |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
198 |
// Reuse hijacked write buffer as connection buffer. |
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parents:
diff
changeset
|
199 |
writeBuf = buf |
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parents:
diff
changeset
|
200 |
} |
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parents:
diff
changeset
|
201 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
202 |
c := newConn(netConn, true, u.ReadBufferSize, u.WriteBufferSize, u.WriteBufferPool, br, writeBuf) |
2a9ec03fe5a1
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parents:
diff
changeset
|
203 |
c.subprotocol = subprotocol |
2a9ec03fe5a1
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parents:
diff
changeset
|
204 |
|
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parents:
diff
changeset
|
205 |
if compress { |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
206 |
c.newCompressionWriter = compressNoContextTakeover |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
207 |
c.newDecompressionReader = decompressNoContextTakeover |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
208 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
209 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
210 |
// Use larger of hijacked buffer and connection write buffer for header. |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
211 |
p := buf |
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parents:
diff
changeset
|
212 |
if len(c.writeBuf) > len(p) { |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
213 |
p = c.writeBuf |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
214 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
215 |
p = p[:0] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
216 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
217 |
p = append(p, "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: "...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
218 |
p = append(p, computeAcceptKey(challengeKey)...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
219 |
p = append(p, "\r\n"...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
220 |
if c.subprotocol != "" { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
221 |
p = append(p, "Sec-WebSocket-Protocol: "...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
222 |
p = append(p, c.subprotocol...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
223 |
p = append(p, "\r\n"...) |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
224 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
225 |
if compress { |
2a9ec03fe5a1
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parents:
diff
changeset
|
226 |
p = append(p, "Sec-WebSocket-Extensions: permessage-deflate; server_no_context_takeover; client_no_context_takeover\r\n"...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
227 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
228 |
for k, vs := range responseHeader { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
229 |
if k == "Sec-Websocket-Protocol" { |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
230 |
continue |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
231 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
232 |
for _, v := range vs { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
233 |
p = append(p, k...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
234 |
p = append(p, ": "...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
235 |
for i := 0; i < len(v); i++ { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
236 |
b := v[i] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
237 |
if b <= 31 { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
238 |
// prevent response splitting. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
239 |
b = ' ' |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
240 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
241 |
p = append(p, b) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
242 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
243 |
p = append(p, "\r\n"...) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
244 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
245 |
} |
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|
246 |
p = append(p, "\r\n"...) |
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|
247 |
|
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|
248 |
// Clear deadlines set by HTTP server. |
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|
249 |
netConn.SetDeadline(time.Time{}) |
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|
250 |
|
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|
251 |
if u.HandshakeTimeout > 0 { |
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|
252 |
netConn.SetWriteDeadline(time.Now().Add(u.HandshakeTimeout)) |
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|
253 |
} |
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|
254 |
if _, err = netConn.Write(p); err != nil { |
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|
255 |
netConn.Close() |
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|
256 |
return nil, err |
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|
257 |
} |
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|
258 |
if u.HandshakeTimeout > 0 { |
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|
259 |
netConn.SetWriteDeadline(time.Time{}) |
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|
260 |
} |
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|
261 |
|
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|
262 |
return c, nil |
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|
263 |
} |
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|
264 |
|
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|
265 |
// Upgrade upgrades the HTTP server connection to the WebSocket protocol. |
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|
266 |
// |
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|
267 |
// Deprecated: Use websocket.Upgrader instead. |
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|
268 |
// |
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|
269 |
// Upgrade does not perform origin checking. The application is responsible for |
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|
270 |
// checking the Origin header before calling Upgrade. An example implementation |
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|
271 |
// of the same origin policy check is: |
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272 |
// |
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|
273 |
// if req.Header.Get("Origin") != "http://"+req.Host { |
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|
274 |
// http.Error(w, "Origin not allowed", http.StatusForbidden) |
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|
275 |
// return |
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|
276 |
// } |
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277 |
// |
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|
278 |
// If the endpoint supports subprotocols, then the application is responsible |
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|
279 |
// for negotiating the protocol used on the connection. Use the Subprotocols() |
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|
280 |
// function to get the subprotocols requested by the client. Use the |
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|
281 |
// Sec-Websocket-Protocol response header to specify the subprotocol selected |
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|
282 |
// by the application. |
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|
283 |
// |
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|
284 |
// The responseHeader is included in the response to the client's upgrade |
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|
285 |
// request. Use the responseHeader to specify cookies (Set-Cookie) and the |
2a9ec03fe5a1
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|
286 |
// negotiated subprotocol (Sec-Websocket-Protocol). |
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|
287 |
// |
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changeset
|
288 |
// The connection buffers IO to the underlying network connection. The |
2a9ec03fe5a1
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changeset
|
289 |
// readBufSize and writeBufSize parameters specify the size of the buffers to |
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|
290 |
// use. Messages can be larger than the buffers. |
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|
291 |
// |
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|
292 |
// If the request is not a valid WebSocket handshake, then Upgrade returns an |
2a9ec03fe5a1
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|
293 |
// error of type HandshakeError. Applications should handle this error by |
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|
294 |
// replying to the client with an HTTP error response. |
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|
295 |
func Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header, readBufSize, writeBufSize int) (*Conn, error) { |
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|
296 |
u := Upgrader{ReadBufferSize: readBufSize, WriteBufferSize: writeBufSize} |
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|
297 |
u.Error = func(w http.ResponseWriter, r *http.Request, status int, reason error) { |
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|
298 |
// don't return errors to maintain backwards compatibility |
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|
299 |
} |
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changeset
|
300 |
u.CheckOrigin = func(r *http.Request) bool { |
2a9ec03fe5a1
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diff
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|
301 |
// allow all connections by default |
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changeset
|
302 |
return true |
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parents:
diff
changeset
|
303 |
} |
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parents:
diff
changeset
|
304 |
return u.Upgrade(w, r, responseHeader) |
2a9ec03fe5a1
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parents:
diff
changeset
|
305 |
} |
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changeset
|
306 |
|
2a9ec03fe5a1
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parents:
diff
changeset
|
307 |
// Subprotocols returns the subprotocols requested by the client in the |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
308 |
// Sec-Websocket-Protocol header. |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
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changeset
|
309 |
func Subprotocols(r *http.Request) []string { |
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Use vendoring for backward compatibility
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diff
changeset
|
310 |
h := strings.TrimSpace(r.Header.Get("Sec-Websocket-Protocol")) |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
311 |
if h == "" { |
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diff
changeset
|
312 |
return nil |
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parents:
diff
changeset
|
313 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
314 |
protocols := strings.Split(h, ",") |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
315 |
for i := range protocols { |
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parents:
diff
changeset
|
316 |
protocols[i] = strings.TrimSpace(protocols[i]) |
2a9ec03fe5a1
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diff
changeset
|
317 |
} |
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diff
changeset
|
318 |
return protocols |
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diff
changeset
|
319 |
} |
2a9ec03fe5a1
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changeset
|
320 |
|
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parents:
diff
changeset
|
321 |
// IsWebSocketUpgrade returns true if the client requested upgrade to the |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
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diff
changeset
|
322 |
// WebSocket protocol. |
2a9ec03fe5a1
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parents:
diff
changeset
|
323 |
func IsWebSocketUpgrade(r *http.Request) bool { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
324 |
return tokenListContainsValue(r.Header, "Connection", "upgrade") && |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
325 |
tokenListContainsValue(r.Header, "Upgrade", "websocket") |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
326 |
} |
2a9ec03fe5a1
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diff
changeset
|
327 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
328 |
// bufioReaderSize size returns the size of a bufio.Reader. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
329 |
func bufioReaderSize(originalReader io.Reader, br *bufio.Reader) int { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
330 |
// This code assumes that peek on a reset reader returns |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
331 |
// bufio.Reader.buf[:0]. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
332 |
// TODO: Use bufio.Reader.Size() after Go 1.10 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
333 |
br.Reset(originalReader) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
334 |
if p, err := br.Peek(0); err == nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
335 |
return cap(p) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
336 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
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diff
changeset
|
337 |
return 0 |
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
338 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
339 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
340 |
// writeHook is an io.Writer that records the last slice passed to it vio |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
341 |
// io.Writer.Write. |
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parents:
diff
changeset
|
342 |
type writeHook struct { |
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Mikael Berthe <mikael@lilotux.net>
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diff
changeset
|
343 |
p []byte |
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Mikael Berthe <mikael@lilotux.net>
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diff
changeset
|
344 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
345 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
346 |
func (wh *writeHook) Write(p []byte) (int, error) { |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
347 |
wh.p = p |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
348 |
return len(p), nil |
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Use vendoring for backward compatibility
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diff
changeset
|
349 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
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diff
changeset
|
350 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
351 |
// bufioWriterBuffer grabs the buffer from a bufio.Writer. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
352 |
func bufioWriterBuffer(originalWriter io.Writer, bw *bufio.Writer) []byte { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
353 |
// This code assumes that bufio.Writer.buf[:1] is passed to the |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
354 |
// bufio.Writer's underlying writer. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
355 |
var wh writeHook |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
356 |
bw.Reset(&wh) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
357 |
bw.WriteByte(0) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
358 |
bw.Flush() |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
359 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
360 |
bw.Reset(originalWriter) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
361 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
362 |
return wh.p[:cap(wh.p)] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
363 |
} |