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calendar.js
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calendar.js
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'use strict'
/**
* Calendar module.
* @module Calendar
* @author EternityWall
* @license LPGL3
*/
const requestPromise = require('request-promise')
const minimatch = require('minimatch')
require('./extend-error.js')
if (URL === undefined) {
/* eslint no-global-assign: "error" */
/* global URL:writable */
URL = require('url').URL
}
const Utils = require('./utils.js')
const Context = require('./context.js')
const Timestamp = require('./timestamp.js')
/* Errors */
const CommitmentNotFoundError = Error.extend('CommitmentNotFoundError')
const URLError = Error.extend('URLError')
const ExceededSizeError = Error.extend('ExceededSizeError')
/** Class representing Remote Calendar server interface */
class RemoteCalendar {
/**
* Create a RemoteCalendar.
* @param {string} url - The server url.
*/
constructor (url) {
this.url = url
this.headers = {
Accept: 'application/vnd.opentimestamps.v1',
'Content-Type': 'application/x-www-form-urlencoded'
}
if (!process.browser) { // only in node.js
this.headers['User-Agent'] = 'javascript-opentimestamps'
}
}
/**
* This callback is called when the result is loaded.
* @callback resolve
* @param {Timestamp} timestamp - The timestamp of the Calendar response.
*/
/**
* This callback is called when the result fails to load.
* @callback reject
* @param {Error} error - The error that occurred while loading the result.
*/
/**
* Submitting a digest to remote calendar. Returns a Timestamp committing to that digest.
* @param {byte[]} digest - The digest hash to send.
* @returns {Promise} A promise that returns {@link resolve} if resolved
* and {@link reject} if rejected.
*/
submit (digest) {
const options = {
url: new URL('/digest', this.url),
method: 'POST',
headers: this.headers,
timeout: this.timeout,
encoding: null,
body: Buffer.from(digest)
}
return requestPromise(options)
.then(body => {
if (body.size > 10000) {
throw new ExceededSizeError('Calendar response exceeded size limit')
}
const ctx = new Context.StreamDeserialization(body)
const timestamp = Timestamp.deserialize(ctx, digest)
return timestamp
}).catch(err => {
throw new URLError(err.error.toString())
})
}
/**
* Get a timestamp for a given commitment.
* @param {byte[]} digest - The digest hash to send.
* @returns {Promise} A promise that returns {@link resolve} if resolved
* and {@link reject} if rejected.
*/
getTimestamp (commitment) {
const options = {
url: new URL('/timestamp/' + Utils.bytesToHex(commitment), this.url),
method: 'GET',
headers: this.headers,
timeout: this.timeout,
encoding: null
}
return requestPromise(options)
.then(body => {
if (body.size > 10000) {
throw new ExceededSizeError('Calendar response exceeded size limit')
}
const ctx = new Context.StreamDeserialization(body)
const timestamp = Timestamp.deserialize(ctx, commitment)
return timestamp
}).catch(err => {
if (err.statusCode === 404) {
throw new CommitmentNotFoundError(err.error.toString())
}
throw new Error(err.error.toString())
})
}
}
class UrlWhitelist {
constructor (urls) {
this.urls = new Set()
if (!urls) {
return
}
urls.forEach(u => this.add(u))
}
add (url) {
if (typeof (url) !== 'string') {
throw new TypeError('URL must be a string')
}
if (url.startsWith('http://') || url.startsWith('https://')) {
this.urls.add(url)
} else {
this.urls.add('http://' + url)
this.urls.add('https://' + url)
}
}
contains (url) {
return [...this.urls].filter(u => minimatch(url, u)).length > 0
}
toString () {
return 'UrlWhitelist([' + this.urls.join(',') + '])'
}
}
const DEFAULT_CALENDAR_WHITELIST = new UrlWhitelist(
['https://*.calendar.opentimestamps.org', // Run by Peter Todd
'https://*.calendar.eternitywall.com', // Run by Riccardo Casatta of Eternity Wall
'https://*.calendar.catallaxy.com' // Run by Vincent Cloutier of Catallaxy
])
const DEFAULT_AGGREGATORS =
['https://a.pool.opentimestamps.org',
'https://b.pool.opentimestamps.org',
'https://a.pool.eternitywall.com',
'https://ots.btc.catallaxy.com'
]
module.exports = {
RemoteCalendar,
UrlWhitelist,
DEFAULT_CALENDAR_WHITELIST,
DEFAULT_AGGREGATORS,
CommitmentNotFoundError,
URLError,
ExceededSizeError
}