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'use strict'
var transport = require('../../../spdy-transport')
var constants = require('./').constants
var base = transport.protocol.base
var utils = base.utils
var assert = require('assert')
var util = require('util')
var Buffer = require('buffer').Buffer
var WriteBuffer = require('wbuf')
var debug = require('debug')('spdy:framer')
function Framer (options) {
base.Framer.call(this, options)
}
util.inherits(Framer, base.Framer)
module.exports = Framer
Framer.create = function create (options) {
return new Framer(options)
}
Framer.prototype.setMaxFrameSize = function setMaxFrameSize (size) {
// http2-only
}
Framer.prototype.headersToDict = function headersToDict (headers,
preprocess,
callback) {
function stringify (value) {
if (value !== undefined) {
if (Array.isArray(value)) {
return value.join('\x00')
} else if (typeof value === 'string') {
return value
} else {
return value.toString()
}
} else {
return ''
}
}
// Lower case of all headers keys
var loweredHeaders = {}
Object.keys(headers || {}).map(function (key) {
loweredHeaders[key.toLowerCase()] = headers[key]
})
// Allow outer code to add custom headers or remove something
if (preprocess) { preprocess(loweredHeaders) }
// Transform object into kv pairs
var size = this.version === 2 ? 2 : 4
var len = size
var pairs = Object.keys(loweredHeaders).filter(function (key) {
var lkey = key.toLowerCase()
// Will be in `:host`
if (lkey === 'host' && this.version >= 3) {
return false
}
return lkey !== 'connection' && lkey !== 'keep-alive' &&
lkey !== 'proxy-connection' && lkey !== 'transfer-encoding'
}, this).map(function (key) {
var klen = Buffer.byteLength(key)
var value = stringify(loweredHeaders[key])
var vlen = Buffer.byteLength(value)
len += size * 2 + klen + vlen
return [klen, key, vlen, value]
})
var block = new WriteBuffer()
block.reserve(len)
if (this.version === 2) {
block.writeUInt16BE(pairs.length)
} else {
block.writeUInt32BE(pairs.length)
}
pairs.forEach(function (pair) {
// Write key length
if (this.version === 2) {
block.writeUInt16BE(pair[0])
} else {
block.writeUInt32BE(pair[0])
}
// Write key
block.write(pair[1])
// Write value length
if (this.version === 2) {
block.writeUInt16BE(pair[2])
} else {
block.writeUInt32BE(pair[2])
}
// Write value
block.write(pair[3])
}, this)
assert(this.compress !== null, 'Framer version not initialized')
this.compress.write(block.render(), callback)
}
Framer.prototype._frame = function _frame (frame, body, callback) {
if (!this.version) {
this.on('version', function () {
this._frame(frame, body, callback)
})
return
}
debug('id=%d type=%s', frame.id, frame.type)
var buffer = new WriteBuffer()
buffer.writeUInt16BE(0x8000 | this.version)
buffer.writeUInt16BE(constants.frameType[frame.type])
buffer.writeUInt8(frame.flags)
var len = buffer.skip(3)
body(buffer)
var frameSize = buffer.size - constants.FRAME_HEADER_SIZE
len.writeUInt24BE(frameSize)
var chunks = buffer.render()
var toWrite = {
stream: frame.id,
priority: false,
chunks: chunks,
callback: callback
}
this._resetTimeout()
this.schedule(toWrite)
return chunks
}
Framer.prototype._synFrame = function _synFrame (frame, callback) {
var self = this
if (!frame.path) {
throw new Error('`path` is required frame argument')
}
function preprocess (headers) {
var method = frame.method || base.constants.DEFAULT_METHOD
var version = frame.version || 'HTTP/1.1'
var scheme = frame.scheme || 'https'
var host = frame.host ||
(frame.headers && frame.headers.host) ||
base.constants.DEFAULT_HOST
if (self.version === 2) {
headers.method = method
headers.version = version
headers.url = frame.path
headers.scheme = scheme
headers.host = host
if (frame.status) {
headers.status = frame.status
}
} else {
headers[':method'] = method
headers[':version'] = version
headers[':path'] = frame.path
headers[':scheme'] = scheme
headers[':host'] = host
if (frame.status) { headers[':status'] = frame.status }
}
}
this.headersToDict(frame.headers, preprocess, function (err, chunks) {
if (err) {
if (callback) {
return callback(err)
} else {
return self.emit('error', err)
}
}
self._frame({
type: 'SYN_STREAM',
id: frame.id,
flags: frame.fin ? constants.flags.FLAG_FIN : 0
}, function (buf) {
buf.reserve(10)
buf.writeUInt32BE(frame.id & 0x7fffffff)
buf.writeUInt32BE(frame.associated & 0x7fffffff)
var weight = (frame.priority && frame.priority.weight) ||
constants.DEFAULT_WEIGHT
// We only have 3 bits for priority in SPDY, try to fit it into this
var priority = utils.weightToPriority(weight)
buf.writeUInt8(priority << 5)
// CREDENTIALS slot
buf.writeUInt8(0)
for (var i = 0; i < chunks.length; i++) {
buf.copyFrom(chunks[i])
}
}, callback)
})
}
Framer.prototype.requestFrame = function requestFrame (frame, callback) {
this._synFrame({
id: frame.id,
fin: frame.fin,
associated: 0,
method: frame.method,
version: frame.version,
scheme: frame.scheme,
host: frame.host,
path: frame.path,
priority: frame.priority,
headers: frame.headers
}, callback)
}
Framer.prototype.responseFrame = function responseFrame (frame, callback) {
var self = this
var reason = frame.reason
if (!reason) {
reason = constants.statusReason[frame.status]
}
function preprocess (headers) {
if (self.version === 2) {
headers.status = frame.status + ' ' + reason
headers.version = 'HTTP/1.1'
} else {
headers[':status'] = frame.status + ' ' + reason
headers[':version'] = 'HTTP/1.1'
}
}
this.headersToDict(frame.headers, preprocess, function (err, chunks) {
if (err) {
if (callback) {
return callback(err)
} else {
return self.emit('error', err)
}
}
self._frame({
type: 'SYN_REPLY',
id: frame.id,
flags: 0
}, function (buf) {
buf.reserve(self.version === 2 ? 6 : 4)
buf.writeUInt32BE(frame.id & 0x7fffffff)
// Unused data
if (self.version === 2) {
buf.writeUInt16BE(0)
}
for (var i = 0; i < chunks.length; i++) {
buf.copyFrom(chunks[i])
}
}, callback)
})
}
Framer.prototype.pushFrame = function pushFrame (frame, callback) {
var self = this
this._checkPush(function (err) {
if (err) { return callback(err) }
self._synFrame({
id: frame.promisedId,
associated: frame.id,
method: frame.method,
status: frame.status || 200,
version: frame.version,
scheme: frame.scheme,
host: frame.host,
path: frame.path,
priority: frame.priority,
// Merge everything together, there is no difference in SPDY protocol
headers: Object.assign(Object.assign({}, frame.headers), frame.response)
}, callback)
})
}
Framer.prototype.headersFrame = function headersFrame (frame, callback) {
var self = this
this.headersToDict(frame.headers, null, function (err, chunks) {
if (err) {
if (callback) { return callback(err) } else {
return self.emit('error', err)
}
}
self._frame({
type: 'HEADERS',
id: frame.id,
priority: false,
flags: 0
}, function (buf) {
buf.reserve(4 + (self.version === 2 ? 2 : 0))
buf.writeUInt32BE(frame.id & 0x7fffffff)
// Unused data
if (self.version === 2) { buf.writeUInt16BE(0) }
for (var i = 0; i < chunks.length; i++) {
buf.copyFrom(chunks[i])
}
}, callback)
})
}
Framer.prototype.dataFrame = function dataFrame (frame, callback) {
if (!this.version) {
return this.on('version', function () {
this.dataFrame(frame, callback)
})
}
debug('id=%d type=DATA', frame.id)
var buffer = new WriteBuffer()
buffer.reserve(8 + frame.data.length)
buffer.writeUInt32BE(frame.id & 0x7fffffff)
buffer.writeUInt8(frame.fin ? 0x01 : 0x0)
buffer.writeUInt24BE(frame.data.length)
buffer.copyFrom(frame.data)
var chunks = buffer.render()
var toWrite = {
stream: frame.id,
priority: frame.priority,
chunks: chunks,
callback: callback
}
var self = this
this._resetTimeout()
var bypass = this.version < 3.1
this.window.send.update(-frame.data.length, bypass ? undefined : function () {
self._resetTimeout()
self.schedule(toWrite)
})
if (bypass) {
this._resetTimeout()
this.schedule(toWrite)
}
}
Framer.prototype.pingFrame = function pingFrame (frame, callback) {
this._frame({
type: 'PING',
id: 0,
flags: 0
}, function (buf, callback) {
buf.reserve(4)
var opaque = frame.opaque
buf.writeUInt32BE(opaque.readUInt32BE(opaque.length - 4, true))
}, callback)
}
Framer.prototype.rstFrame = function rstFrame (frame, callback) {
this._frame({
type: 'RST_STREAM',
id: frame.id,
flags: 0
}, function (buf) {
buf.reserve(8)
// Stream ID
buf.writeUInt32BE(frame.id & 0x7fffffff)
// Status Code
buf.writeUInt32BE(constants.error[frame.code])
// Extra debugging information
if (frame.extra) {
buf.write(frame.extra)
}
}, callback)
}
Framer.prototype.prefaceFrame = function prefaceFrame () {
}
Framer.prototype.settingsFrame = function settingsFrame (options, callback) {
var self = this
var key = this.version + '/' + JSON.stringify(options)
var settings = Framer.settingsCache[key]
if (settings) {
debug('cached settings')
this._resetTimeout()
this.schedule({
stream: 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 frame = this._frame({
type: 'SETTINGS',
id: 0,
flags: 0
}, function (buf) {
buf.reserve(4 + 8 * params.length)
// Count of entries
buf.writeUInt32BE(params.length)
params.forEach(function (param) {
var flag = constants.settings.FLAG_SETTINGS_PERSIST_VALUE << 24
if (self.version === 2) {
buf.writeUInt32LE(flag | param.key)
} else { buf.writeUInt32BE(flag | param.key) }
buf.writeUInt32BE(param.value & 0x7fffffff)
})
}, callback)
Framer.settingsCache[key] = frame
}
Framer.settingsCache = {}
Framer.prototype.ackSettingsFrame = function ackSettingsFrame (callback) {
if (callback) {
process.nextTick(callback)
}
}
Framer.prototype.windowUpdateFrame = function windowUpdateFrame (frame,
callback) {
this._frame({
type: 'WINDOW_UPDATE',
id: frame.id,
flags: 0
}, function (buf) {
buf.reserve(8)
// ID
buf.writeUInt32BE(frame.id & 0x7fffffff)
// Delta
buf.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)
// Status
buf.writeUInt32BE(constants.goaway[frame.code])
}, callback)
}
Framer.prototype.priorityFrame = function priorityFrame (frame, callback) {
// No such thing in SPDY
if (callback) {
process.nextTick(callback)
}
}
Framer.prototype.xForwardedFor = function xForwardedFor (frame, callback) {
this._frame({
type: 'X_FORWARDED_FOR',
id: 0,
flags: 0
}, function (buf) {
buf.writeUInt32BE(Buffer.byteLength(frame.host))
buf.write(frame.host)
}, callback)
}