Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/*
* Copyright (c) 2013-2021 node-coap contributors.
*
* node-coap is licensed under an MIT +no-false-attribs license.
* All rights not explicitly granted in the MIT license are reserved.
* See the included LICENSE file for more details.
*/
var toBinary = require('./option_converter').toBinary
, fromBinary = require('./option_converter').fromBinary
, codes = {
'0.01': 'GET'
, '0.02': 'POST'
, '0.03': 'PUT'
, '0.04': 'DELETE'
}
, capitalize = require('capitalize')
, isIgnored = require('./option_converter').isIgnored
module.exports.genAck = function(request) {
return {
messageId: request.messageId
, code: '0.00'
, options: []
, confirmable: false
, ack: true
, reset: false
}
}
var optionAliases = {
'Content-Type': 'Content-Format',
'Etag': 'ETag'
}
function setOption(name, values) {
var i
name = capitalize.words(name)
name = optionAliases[name] || name
if (isIgnored(name)) {
return this
}
this._packet.options = this._packet.options.filter(function(option) {
return option.name !== name
})
if (!Array.isArray(values))
values = [values]
for (i = 0; i < values.length; i++) {
this._packet.options.push({
name: name
, value: toBinary(name, values[i])
})
}
return this
}
module.exports.addSetOption = function(klass) {
var proto = klass.prototype
proto.setOption = setOption
proto.setHeader = setOption
}
module.exports.toCode = function toCode(code) {
if (typeof code === 'string')
return code
var first = Math.floor(code / 100)
, second = code - first * 100
, result = ''
result += first + '.'
Eif (second < 10)
result += '0'
result += second
return result
}
module.exports.packetToMessage = function packetToMessage(dest, packet) {
var i
, options = packet.options
, option
, paths = []
, queries = []
, query = ''
dest.payload = packet.payload
dest.options = packet.options
dest.code = packet.code
dest.method = codes[packet.code]
dest.headers = {}
for (i=0; i < options.length; i++) {
option = options[i]
if (option.name === 'Uri-Path') {
paths.push(option.value)
}
if (option.name === 'Uri-Query') {
queries.push(option.value)
}
option.value = fromBinary(option.name, option.value)
if (option.value != null && !Buffer.isBuffer(option.value))
dest.headers[option.name] = option.value
}
if (dest.headers['Content-Format'])
dest.headers['Content-Type'] = dest.headers['Content-Format']
query = queries.join('&')
dest.url = '/' + paths.join('/')
if (query) {
dest.url += '?' + query
}
}
module.exports.hasOption = function hasOption(options, name) {
for (var i in options)
if (options[i].name == name)
return true
return null
}
/*
get an option value from options
options array of object, in form {name: , value}
name name of the object wanted to retrive
return value, or null
*/
module.exports.getOption = function getOption(options, name) {
for (var i in options)
if (options[i].name == name)
return options[i].value
return null
}
/*
get an option value from options
options array of object, in form {name: , value}
name name of the object wanted to retrive
return value, or null
*/
module.exports.removeOption = function removeOption(options, name) {
for (var i in options) {
if (options[i].name == name) {
delete options[i]
return true
}
}
return false
}
module.exports.simplifyPacketForPrint = function simplifyPacketForPrint(packetIn) {
var packet = Object.assign({}, packetIn)
packet.token = packet.token.toString("hex")
packet.payload = "Buff: " + packet.payload.length
var newOptions = {}
for(var j in packet.options) {
var name = packet.options[j].name
var hex = packet.options[j].value.toString("hex")
newOptions[name] = hex
}
packet.options = newOptions
return packet
}
/*
parse block2
value block2 value buffer
return object describes block2, {moreBlock2: , num: , size: }
with invalid block2 value, the function return null
*/
module.exports.parseBlock2 = function parseBlock2(block2Value) {
var num
switch (block2Value.length) {
case 1:
num = block2Value[0] >> 4
break
case 2:
num = (block2Value[0]*256 + block2Value[1]) >> 4
break
case 3:
num = (block2Value[0]*256*256 + block2Value[1]*256 + block2Value[2]) >>4
break
default:
// Block2 is more than 3 bytes
return null
}
// limit value of size is 1024 (2**(6+4))
if (block2Value.slice(-1)[0] == 7) {
// Block size is bigger than 1024
return null
}
return {
moreBlock2: (block2Value.slice(-1)[0] & (0x01<<3))? true:false,
num: num,
size: Math.pow(2, (block2Value.slice(-1)[0] & 0x07)+4)
}
}
/*
create buffer for block2 option
requestedBlock object contain block2 infor, e.g. {moreBlock2: true, num: 100, size: 32}
return Buffer carrying block2 value
*/
module.exports.createBlock2 = function createBlock2(requestedBlock) {
var byte
var szx = Math.log(requestedBlock.size)/Math.log(2) - 4
var m = ((requestedBlock.moreBlock2==true)?1:0)
var num = requestedBlock.num
var extraNum
byte = 0
byte |= szx
byte |= m << 3
byte |= (num&0xf) <<4
// total num occupy up to 5 octets
// num share the higher octet of first byte, and (may) take more 2 bytes for the rest 4 octets
if (num <= 0xf) {
extraNum = null
}
else if (num <=0xfff) {
extraNum = Buffer.of(num/16)
}
else if (num <=0xfffff) {
extraNum = Buffer.alloc(2)
extraNum.writeUInt16BE(num>>4,0)
}
else {
// too big block2 number
return null
}
return (extraNum)? Buffer.concat([extraNum, Buffer.of(byte)]):Buffer.of(byte)
}
/**
* Provide a or function to use with the reduce() Array method
*/
module.exports.or = function or(previous, current) {
return previous || current
}
/**
* Provide a function to detect whether an option has a particular name (for its use with filter or map).
*/
module.exports.isOption = function isOption(optionName) {
return function(option) {
return option.name === optionName
}
}
module.exports.isNumeric = function isNumeric(n) {
return !isNaN(parseFloat(n)) && isFinite(n)
}
module.exports.isBoolean = function isBoolean(n) {
return typeof(n) === 'boolean'
}
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