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'use strict'
var transport = require('../../../spdy-transport')
var base = transport.protocol.base
var constants = require('./').constants
var assert = require('assert')
var util = require('util')
var WriteBuffer = require('wbuf')
var OffsetBuffer = require('obuf')
var debug = require('debug')('spdy:framer')
var debugExtra = require('debug')('spdy:framer:extra')
function Framer (options) {
base.Framer.call(this, options)
this.maxFrameSize = constants.INITIAL_MAX_FRAME_SIZE
}
util.inherits(Framer, base.Framer)
module.exports = Framer
Framer.create = function create (options) {
return new Framer(options)
}
Framer.prototype.setMaxFrameSize = function setMaxFrameSize (size) {
this.maxFrameSize = size
}
Framer.prototype._frame = function _frame (frame, body, callback) {
debug('id=%d type=%s', frame.id, frame.type)
var buffer = new WriteBuffer()
buffer.reserve(constants.FRAME_HEADER_SIZE)
var len = buffer.skip(3)
buffer.writeUInt8(constants.frameType[frame.type])
buffer.writeUInt8(frame.flags)
buffer.writeUInt32BE(frame.id & 0x7fffffff)
body(buffer)
var frameSize = buffer.size - constants.FRAME_HEADER_SIZE
len.writeUInt24BE(frameSize)
var chunks = buffer.render()
var toWrite = {
stream: frame.id,
priority: frame.priority === undefined ? false : frame.priority,
chunks: chunks,
callback: callback
}
if (this.window && frame.type === 'DATA') {
var self = this
this._resetTimeout()
this.window.send.update(-frameSize, function () {
self._resetTimeout()
self.schedule(toWrite)
})
} else {
this._resetTimeout()
this.schedule(toWrite)
}
return chunks
}
Framer.prototype._split = function _split (frame) {
var buf = new OffsetBuffer()
for (var i = 0; i < frame.chunks.length; i++) { buf.push(frame.chunks[i]) }
var frames = []
while (!buf.isEmpty()) {
// First frame may have reserved bytes in it
var size = this.maxFrameSize
if (frames.length === 0) {
size -= frame.reserve
}
size = Math.min(size, buf.size)
var frameBuf = buf.clone(size)
buf.skip(size)
frames.push({
size: frameBuf.size,
chunks: frameBuf.toChunks()
})
}
return frames
}
Framer.prototype._continuationFrame = function _continuationFrame (frame,
body,
callback) {
var frames = this._split(frame)
frames.forEach(function (subFrame, i) {
var isFirst = i === 0
var isLast = i === frames.length - 1
var flags = isLast ? constants.flags.END_HEADERS : 0
// PRIORITY and friends
if (isFirst) {
flags |= frame.flags
}
this._frame({
id: frame.id,
priority: false,
type: isFirst ? frame.type : 'CONTINUATION',
flags: flags
}, function (buf) {
// Fill those reserved bytes
if (isFirst && body) { body(buf) }
buf.reserve(subFrame.size)
for (var i = 0; i < subFrame.chunks.length; i++) { buf.copyFrom(subFrame.chunks[i]) }
}, isLast ? callback : null)
}, this)
if (frames.length === 0) {
this._frame({
id: frame.id,
priority: false,
type: frame.type,
flags: frame.flags | constants.flags.END_HEADERS
}, function (buf) {
if (body) { body(buf) }
}, callback)
}
}
Framer.prototype._compressHeaders = function _compressHeaders (headers,
pairs,
callback) {
Object.keys(headers || {}).forEach(function (name) {
var lowName = name.toLowerCase()
// Not allowed in HTTP2
switch (lowName) {
case 'host':
case 'connection':
case 'keep-alive':
case 'proxy-connection':
case 'transfer-encoding':
case 'upgrade':
return
}
// Should be in `pairs`
if (/^:/.test(lowName)) {
return
}
// Do not compress, or index Cookie field (for security reasons)
var neverIndex = lowName === 'cookie' || lowName === 'set-cookie'
var value = headers[name]
if (Array.isArray(value)) {
for (var i = 0; i < value.length; i++) {
pairs.push({
name: lowName,
value: value[i] + '',
neverIndex: neverIndex,
huffman: !neverIndex
})
}
} else {
pairs.push({
name: lowName,
value: value + '',
neverIndex: neverIndex,
huffman: !neverIndex
})
}
})
assert(this.compress !== null, 'Framer version not initialized')
debugExtra('compressing headers=%j', pairs)
this.compress.write([ pairs ], callback)
}
Framer.prototype._isDefaultPriority = function _isDefaultPriority (priority) {
if (!priority) { return true }
return !priority.parent &&
priority.weight === constants.DEFAULT &&
!priority.exclusive
}
Framer.prototype._defaultHeaders = function _defaultHeaders (frame, pairs) {
if (!frame.path) {
throw new Error('`path` is required frame argument')
}
pairs.push({
name: ':method',
value: frame.method || base.constants.DEFAULT_METHOD
})
pairs.push({ name: ':path', value: frame.path })
pairs.push({ name: ':scheme', value: frame.scheme || 'https' })
pairs.push({
name: ':authority',
value: frame.host ||
(frame.headers && frame.headers.host) ||
base.constants.DEFAULT_HOST
})
}
Framer.prototype._headersFrame = function _headersFrame (kind, frame, callback) {
var pairs = []
if (kind === 'request') {
this._defaultHeaders(frame, pairs)
} else if (kind === 'response') {
pairs.push({ name: ':status', value: (frame.status || 200) + '' })
}
var self = this
this._compressHeaders(frame.headers, pairs, function (err, chunks) {
if (err) {
if (callback) {
return callback(err)
} else {
return self.emit('error', err)
}
}
var reserve = 0
// If priority info is present, and the values are not default ones
// reserve space for the priority info and add PRIORITY flag
var priority = frame.priority
if (!self._isDefaultPriority(priority)) { reserve = 5 }
var flags = reserve === 0 ? 0 : constants.flags.PRIORITY
// Mostly for testing
if (frame.fin) {
flags |= constants.flags.END_STREAM
}
self._continuationFrame({
id: frame.id,
type: 'HEADERS',
flags: flags,
reserve: reserve,
chunks: chunks
}, function (buf) {
if (reserve === 0) {
return
}
buf.writeUInt32BE(((priority.exclusive ? 0x80000000 : 0) |
priority.parent) >>> 0)
buf.writeUInt8((priority.weight | 0) - 1)
}, callback)
})
}
Framer.prototype.requestFrame = function requestFrame (frame, callback) {
return this._headersFrame('request', frame, callback)
}
Framer.prototype.responseFrame = function responseFrame (frame, callback) {
return this._headersFrame('response', frame, callback)
}
Framer.prototype.headersFrame = function headersFrame (frame, callback) {
return this._headersFrame('headers', frame, callback)
}
Framer.prototype.pushFrame = function pushFrame (frame, callback) {
var self = this
function compress (headers, pairs, callback) {
self._compressHeaders(headers, pairs, function (err, chunks) {
if (err) {
if (callback) {
return callback(err)
} else {
return self.emit('error', err)
}
}
callback(chunks)
})
}
function sendPromise (chunks) {
self._continuationFrame({
id: frame.id,
type: 'PUSH_PROMISE',
reserve: 4,
chunks: chunks
}, function (buf) {
buf.writeUInt32BE(frame.promisedId)
})
}
function sendResponse (chunks, callback) {
var priority = frame.priority
var isDefaultPriority = self._isDefaultPriority(priority)
var flags = isDefaultPriority ? 0 : constants.flags.PRIORITY
// Mostly for testing
if (frame.fin) {
flags |= constants.flags.END_STREAM
}
self._continuationFrame({
id: frame.promisedId,
type: 'HEADERS',
flags: flags,
reserve: isDefaultPriority ? 0 : 5,
chunks: chunks
}, function (buf) {
if (isDefaultPriority) {
return
}
buf.writeUInt32BE((priority.exclusive ? 0x80000000 : 0) |
priority.parent)
buf.writeUInt8((priority.weight | 0) - 1)
}, callback)
}
this._checkPush(function (err) {
if (err) {
return callback(err)
}
var pairs = {
promise: [],
response: []
}
self._defaultHeaders(frame, pairs.promise)
pairs.response.push({ name: ':status', value: (frame.status || 200) + '' })
compress(frame.headers, pairs.promise, function (promiseChunks) {
sendPromise(promiseChunks)
if (frame.response === false) {
return callback(null)
}
compress(frame.response, pairs.response, function (responseChunks) {
sendResponse(responseChunks, callback)
})
})
})
}
Framer.prototype.priorityFrame = function priorityFrame (frame, callback) {
this._frame({
id: frame.id,
priority: false,
type: 'PRIORITY',
flags: 0
}, function (buf) {
var priority = frame.priority
buf.writeUInt32BE((priority.exclusive ? 0x80000000 : 0) |
priority.parent)
buf.writeUInt8((priority.weight | 0) - 1)
}, callback)
}
Framer.prototype.dataFrame = function dataFrame (frame, callback) {
var frames = this._split({
reserve: 0,
chunks: [ frame.data ]
})
var fin = frame.fin ? constants.flags.END_STREAM : 0
var self = this
frames.forEach(function (subFrame, i) {
var isLast = i === frames.length - 1
var flags = 0
if (isLast) {
flags |= fin
}
self._frame({
id: frame.id,
priority: frame.priority,
type: 'DATA',
flags: flags
}, function (buf) {
buf.reserve(subFrame.size)
for (var i = 0; i < subFrame.chunks.length; i++) { buf.copyFrom(subFrame.chunks[i]) }
}, isLast ? callback : null)
})
// Empty DATA
if (frames.length === 0) {
this._frame({
id: frame.id,
priority: frame.priority,
type: 'DATA',
flags: fin
}, function (buf) {
// No-op
}, callback)
}
}
Framer.prototype.pingFrame = function pingFrame (frame, callback) {
this._frame({
id: 0,
type: 'PING',
flags: frame.ack ? constants.flags.ACK : 0
}, function (buf) {
buf.copyFrom(frame.opaque)
}, callback)
}
Framer.prototype.rstFrame = function rstFrame (frame, callback) {
this._frame({
id: frame.id,
type: 'RST_STREAM',
flags: 0
}, function (buf) {
buf.writeUInt32BE(constants.error[frame.code])
}, callback)
}
Framer.prototype.prefaceFrame = function prefaceFrame (callback) {
debug('preface')
this._resetTimeout()
this.schedule({
stream: 0,
priority: false,
chunks: [ constants.PREFACE_BUFFER ],
callback: callback
})
}
Framer.prototype.settingsFrame = function settingsFrame (options, callback) {
var key = JSON.stringify(options)
var settings = Framer.settingsCache[key]
if (settings) {
debug('cached settings')
this._resetTimeout()
this.schedule({
id: 0,
priority: false,
chunks: settings,
callback: callback
})
return
}
var params = []
for (var i = 0; i < constants.settingsIndex.length; i++) {
var name = constants.settingsIndex[i]
if (!name) {
continue
}
// value: Infinity
if (!isFinite(options[name])) {
continue
}
if (options[name] !== undefined) {
params.push({ key: i, value: options[name] })
}
}
var bodySize = params.length * 6
var chunks = this._frame({
id: 0,
type: 'SETTINGS',
flags: 0
}, function (buffer) {
buffer.reserve(bodySize)
for (var i = 0; i < params.length; i++) {
var param = params[i]
buffer.writeUInt16BE(param.key)
buffer.writeUInt32BE(param.value)
}
}, callback)
Framer.settingsCache[key] = chunks
}
Framer.settingsCache = {}
Framer.prototype.ackSettingsFrame = function ackSettingsFrame (callback) {
/* var chunks = */ this._frame({
id: 0,
type: 'SETTINGS',
flags: constants.flags.ACK
}, function (buffer) {
// No-op
}, callback)
}
Framer.prototype.windowUpdateFrame = function windowUpdateFrame (frame,
callback) {
this._frame({
id: frame.id,
type: 'WINDOW_UPDATE',
flags: 0
}, function (buffer) {
buffer.reserve(4)
buffer.writeInt32BE(frame.delta)
}, callback)
}
Framer.prototype.goawayFrame = function goawayFrame (frame, callback) {
this._frame({
type: 'GOAWAY',
id: 0,
flags: 0
}, function (buf) {
buf.reserve(8)
// Last-good-stream-ID
buf.writeUInt32BE(frame.lastId & 0x7fffffff)
// Code
buf.writeUInt32BE(constants.goaway[frame.code])
// Extra debugging information
if (frame.extra) { buf.write(frame.extra) }
}, callback)
}
Framer.prototype.xForwardedFor = function xForwardedFor (frame, callback) {
this._frame({
type: 'X_FORWARDED_FOR',
id: 0,
flags: 0
}, function (buf) {
buf.write(frame.host)
}, callback)
}