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ArduinoHttpStream/src/WebSocketStream.cpp at master · lasselukkari/ArduinoHttpStream · GitHub
lasselukkari
ArduinoHttpStream
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//
(c) Copyright Arduino. 2016
//
Released under Apache License, version 2.0
#
include
"
b64.h
"
#
include
"
WebSocketStream.h
"
WebSocketStream::WebSocketStream
(Stream& aStream)
: HttpStream(aStream),
iTxStarted(
false
),
iRxSize(
0
)
{
}
int
WebSocketStream::begin
(
const
char
* aPath)
{
//
start the GET request
beginRequest
();
int
status =
get
(aPath);
if
(status ==
0
)
{
uint8_t
randomKey[
16
];
char
base64RandomKey[
25
];
//
create a random key for the connection upgrade
for
(
int
i =
0
; i < (
int
)
sizeof
(randomKey); i++)
{
randomKey[i] =
random
(
0x01
,
0xff
);
}
memset
(base64RandomKey,
0x00
,
sizeof
(base64RandomKey));
b64_encode
(randomKey,
sizeof
(randomKey), (
unsigned
char
*)base64RandomKey,
sizeof
(base64RandomKey));
//
start the connection upgrade sequence
sendHeader
(
"
Upgrade
"
,
"
websocket
"
);
sendHeader
(
"
Connection
"
,
"
Upgrade
"
);
sendHeader
(
"
Sec-WebSocket-Key
"
, base64RandomKey);
sendHeader
(
"
Sec-WebSocket-Version
"
,
"
13
"
);
endRequest
();
status =
responseStatusCode
();
if
(status >
0
)
{
skipResponseHeaders
();
}
}
iRxSize =
0
;
//
status code of 101 means success
return
(status ==
101
) ?
0
: status;
}
int
WebSocketStream::begin
(
const
String& aPath)
{
return
begin
(aPath.
c_str
());
}
int
WebSocketStream::beginMessage
(
int
aType)
{
if
(iTxStarted)
{
//
fail TX already started
return
1
;
}
iTxStarted =
true
;
iTxMessageType = (aType &
0xf
);
iTxSize =
0
;
return
0
;
}
int
WebSocketStream::endMessage
()
{
if
(!iTxStarted)
{
//
fail TX not started
return
1
;
}
//
send FIN + the message type (opcode)
HttpStream::write
(
0x80
| iTxMessageType);
//
the message is masked (0x80)
//
send the length
if
(iTxSize <
126
)
{
HttpStream::write
(
0x80
| (
uint8_t
)iTxSize);
}
else
if
(iTxSize <
0xffff
)
{
HttpStream::write
(
0x80
|
126
);
HttpStream::write
((iTxSize >>
8
) &
0xff
);
HttpStream::write
((iTxSize >>
0
) &
0xff
);
}
else
{
HttpStream::write
(
0x80
|
127
);
HttpStream::write
((iTxSize >>
56
) &
0xff
);
HttpStream::write
((iTxSize >>
48
) &
0xff
);
HttpStream::write
((iTxSize >>
40
) &
0xff
);
HttpStream::write
((iTxSize >>
32
) &
0xff
);
HttpStream::write
((iTxSize >>
24
) &
0xff
);
HttpStream::write
((iTxSize >>
16
) &
0xff
);
HttpStream::write
((iTxSize >>
8
) &
0xff
);
HttpStream::write
((iTxSize >>
0
) &
0xff
);
}
uint8_t
maskKey[
4
];
//
create a random mask for the data and send
for
(
int
i =
0
; i < (
int
)
sizeof
(maskKey); i++)
{
maskKey[i] =
random
(
0xff
);
}
HttpStream::write
(maskKey,
sizeof
(maskKey));
//
mask the data and send
for
(
int
i =
0
; i < (
int
)iTxSize; i++) {
iTxBuffer[i] ^= maskKey[i %
sizeof
(maskKey)];
}
size_t
txSize = iTxSize;
iTxStarted =
false
;
iTxSize =
0
;
return
(
HttpStream::write
(iTxBuffer, txSize) == txSize) ?
0
:
1
;
}
size_t
WebSocketStream::write
(
uint8_t
aByte)
{
return
write
(&aByte,
sizeof
(aByte));
}
size_t
WebSocketStream::write
(
const
uint8_t
*aBuffer,
size_t
aSize)
{
if
(iState < eReadingBody)
{
//
have not upgraded the connection yet
return
HttpStream::write
(aBuffer, aSize);
}
if
(!iTxStarted)
{
//
fail TX not started
return
0
;
}
//
check if the write size, fits in the buffer
if
((iTxSize + aSize) >
sizeof
(iTxBuffer))
{
aSize =
sizeof
(iTxSize) - iTxSize;
}
//
copy data into the buffer
memcpy
(iTxBuffer + iTxSize, aBuffer, aSize);
iTxSize += aSize;
return
aSize;
}
int
WebSocketStream::parseMessage
()
{
flushRx
();
//
make sure 2 bytes (opcode + length)
//
are available
if
(
HttpStream::available
() <
2
)
{
return
0
;
}
//
read open code and length
uint8_t
opcode =
HttpStream::read
();
int
length =
HttpStream::read
();
if
((opcode &
0x0f
) ==
0
)
{
//
continuation, use previous opcode and update flags
iRxOpCode |= opcode;
}
else
{
iRxOpCode = opcode;
}
iRxMasked = (length &
0x80
);
length &=
0x7f
;
//
read the RX size
if
(length <
126
)
{
iRxSize = length;
}
else
if
(length ==
126
)
{
iRxSize = (
HttpStream::read
() <<
8
) |
HttpStream::read
();
}
else
{
iRxSize = ((
uint64_t
)
HttpStream::read
() <<
56
) |
((
uint64_t
)
HttpStream::read
() <<
48
) |
((
uint64_t
)
HttpStream::read
() <<
40
) |
((
uint64_t
)
HttpStream::read
() <<
32
) |
((
uint64_t
)
HttpStream::read
() <<
24
) |
((
uint64_t
)
HttpStream::read
() <<
16
) |
((
uint64_t
)
HttpStream::read
() <<
8
) |
(
uint64_t
)
HttpStream::read
();
}
//
read in the mask, if present
if
(iRxMasked)
{
for
(
int
i =
0
; i < (
int
)
sizeof
(iRxMaskKey); i++)
{
iRxMaskKey[i] =
HttpStream::read
();
}
}
iRxMaskIndex =
0
;
if
(
TYPE_CONNECTION_CLOSE
==
messageType
())
{
flushRx
();
iRxSize =
0
;
}
else
if
(
TYPE_PING
==
messageType
())
{
beginMessage
(
TYPE_PONG
);
while
(
available
())
{
write
(
read
());
}
endMessage
();
iRxSize =
0
;
}
else
if
(
TYPE_PONG
==
messageType
())
{
flushRx
();
iRxSize =
0
;
}
return
iRxSize;
}
int
WebSocketStream::messageType
()
{
return
(iRxOpCode &
0x0f
);
}
bool
WebSocketStream::isFinal
()
{
return
((iRxOpCode &
0x80
) !=
0
);
}
String
WebSocketStream::readString
()
{
int
avail =
available
();
String s;
if
(avail >
0
)
{
s.
reserve
(avail);
for
(
int
i =
0
; i < avail; i++)
{
s += (
char
)
read
();
}
}
return
s;
}
int
WebSocketStream::ping
()
{
uint8_t
pingData[
16
];
//
create random data for the ping
for
(
int
i =
0
; i < (
int
)
sizeof
(pingData); i++)
{
pingData[i] =
random
(
0xff
);
}
beginMessage
(
TYPE_PING
);
write
(pingData,
sizeof
(pingData));
return
endMessage
();
}
int
WebSocketStream::available
()
{
if
(iState < eReadingBody)
{
return
HttpStream::available
();
}
return
iRxSize;
}
int
WebSocketStream::read
()
{
byte b;
if
(
read
(&b,
sizeof
(b)))
{
return
b;
}
return
-
1
;
}
int
WebSocketStream::read
(
uint8_t
*aBuffer,
size_t
aSize)
{
int
readCount =
HttpStream::readBytes
(aBuffer, aSize);
if
(readCount >
0
)
{
iRxSize -= readCount;
//
unmask the RX data if needed
if
(iRxMasked)
{
for
(
int
i =
0
; i < (
int
)aSize; i++, iRxMaskIndex++)
{
aBuffer[i] ^= iRxMaskKey[iRxMaskIndex %
sizeof
(iRxMaskKey)];
}
}
}
return
readCount;
}
int
WebSocketStream::peek
()
{
int
p =
HttpStream::peek
();
if
(p != -
1
&& iRxMasked)
{
//
unmask the RX data if needed
p = (
uint8_t
)p ^ iRxMaskKey[iRxMaskIndex %
sizeof
(iRxMaskKey)];
}
return
p;
}
void
WebSocketStream::flushRx
()
{
while
(
available
())
{
read
();
}
}
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