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More information: https://www.jsdelivr.com/using-sri-with-dynamic-files\n */\n","/**\n * XEP-0115 Entity capabilities implementation\n *\n * @author Michael Weibel \n * @copyright Mila AG\n * @license MIT\n */\n'use strict';\n\nvar crypto = require('crypto')\n , Element = require('ltx').Element;\n\nfunction sortProperty(array, property) {\n array.sort(function(a, b) {\n if(a[property] > b[property]) {\n return -1;\n }\n if(a[property] < b[property]) {\n return 1;\n }\n return 0;\n });\n}\n\nfunction sortIdentities(ids) {\n sortProperty(ids, 'category');\n sortProperty(ids, 'type');\n sortProperty(ids, 'lang');\n}\n\n/**\n * Capabilities\n *\n * @param {String} node Software identifier\n * @param {String} [hash=sha-1] Hash to generate the version string (only sha-1 supported as of now)\n * @constructor\n */\nfunction Caps(node, hash) {\n this.hash = (hash || 'sha-1').toLowerCase();\n\n if(this.hash !== 'sha-1') {\n throw new Error('Invalid argument provided for hash. Only sha-1 suported');\n }\n\n this.node = node;\n this.identities = [];\n this.features = [];\n}\n\n/**\n * Add an identity\n *\n * @param {String} category\n * @param {String} type\n * @param {String} [name]\n * @param {String} [lang]\n *\n * @returns {Caps}\n */\nCaps.prototype.addIdentity = function(category, type, name, lang) {\n this.identities.push({\n category: category,\n type: type,\n lang: lang,\n name: name\n });\n\n return this;\n};\n\n/**\n * Add supported feature\n *\n * @param {String} name Feature name (aka 'var')\n *\n * @returns {Caps}\n */\nCaps.prototype.addFeature = function(name) {\n this.features.push(name);\n\n return this;\n};\n\n/**\n * Generates the version hash\n * @returns {String}\n */\nCaps.prototype.generateVersionHash = function() {\n var str = '';\n\n sortIdentities(this.identities);\n this.features.sort();\n\n this.identities.forEach(function(id) {\n str += id.category + '/' + id.type + '/' +\n (id.lang || '') + '/' + (id.name || '');\n str += '<';\n });\n str += this.features.join('<');\n str += '<';\n\n var ver = crypto.createHash('sha1');\n ver.update(str);\n ver = ver.digest('base64').toString();\n return ver;\n};\n\n/**\n * Creates a 'c' node to be used in presence stanzas.\n *\n * @returns {Object}\n */\nCaps.prototype.toCapsNode = function() {\n return new Element('c', {\n xmlns: 'http://jabber.org/protocol/caps',\n hash: this.hash,\n node: this.node,\n ver: this.generateVersionHash()\n });\n};\n\n/**\n * Generates a disco#info query node from the identities and features we got.\n *\n * @returns {Element}\n */\nCaps.prototype.toQueryNode = function() {\n var el = new Element('query', {\n xmlns: 'http://jabber.org/protocol/disco#info',\n node: this.node + '#' + this.generateVersionHash()\n });\n\n this.identities.forEach(function(id) {\n el.c('identity', id).up();\n });\n this.features.forEach(function(name) {\n el.c('feature', {\n var: name\n }).up();\n });\n\n return el;\n};\n\n/**\n * Creates a {Caps} from an XML node\n *\n * @param {Object} node\n *\n * @returns {Caps}\n */\nfunction fromQueryNode(query) {\n var node = query.attrs.node.split('#')[0];\n var caps = new Caps(node);\n var identities = query.getChildren('identity');\n var features = query.getChildren('feature');\n\n identities.forEach(function(id) {\n caps.addIdentity(id.attrs.category, id.attrs.type, id.attrs.name, id.attrs.lang);\n });\n features.forEach(function(feature) {\n caps.addFeature(feature.attrs.var);\n });\n\n return caps;\n}\n\nmodule.exports = {\n Caps: Caps,\n fromQueryNode: fromQueryNode\n};\n"]}