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| 1 | +var deepcopy = require('deepcopy'); |
| 2 | +var Parse = require('parse/node').Parse; |
| 3 | +var RestQuery = require('./RestQuery'); |
| 4 | + |
| 5 | +var cache = require('./cache'); |
| 6 | + |
| 7 | +// An Auth object tells you who is requesting something and whether |
| 8 | +// the master key was used. |
| 9 | +// userObject is a Parse.User and can be null if there's no user. |
| 10 | +function Auth(config, isMaster, userObject) { |
| 11 | + this.config = config; |
| 12 | + this.isMaster = isMaster; |
| 13 | + this.user = userObject; |
| 14 | + |
| 15 | + // Assuming a users roles won't change during a single request, we'll |
| 16 | + // only load them once. |
| 17 | + this.userRoles = []; |
| 18 | + this.fetchedRoles = false; |
| 19 | + this.rolePromise = null; |
| 20 | +} |
| 21 | + |
| 22 | +// Whether this auth could possibly modify the given user id. |
| 23 | +// It still could be forbidden via ACLs even if this returns true. |
| 24 | +Auth.prototype.couldUpdateUserId = function(userId) { |
| 25 | + if (this.isMaster) { |
| 26 | + return true; |
| 27 | + } |
| 28 | + if (this.user && this.user.id === userId) { |
| 29 | + return true; |
| 30 | + } |
| 31 | + return false; |
| 32 | +}; |
| 33 | + |
| 34 | +// A helper to get a master-level Auth object |
| 35 | +function master(config) { |
| 36 | + return new Auth(config, true, null); |
| 37 | +} |
| 38 | + |
| 39 | +// A helper to get a nobody-level Auth object |
| 40 | +function nobody(config) { |
| 41 | + return new Auth(config, false, null); |
| 42 | +} |
| 43 | + |
| 44 | +// Returns a promise that resolves to an Auth object |
| 45 | +var getAuthForSessionToken = function(config, sessionToken) { |
| 46 | + var cachedUser = cache.getUser(sessionToken); |
| 47 | + if (cachedUser) { |
| 48 | + return Promise.resolve(new Auth(config, false, cachedUser)); |
| 49 | + } |
| 50 | + var restOptions = { |
| 51 | + limit: 1, |
| 52 | + include: 'user' |
| 53 | + }; |
| 54 | + var restWhere = { |
| 55 | + _session_token: sessionToken |
| 56 | + }; |
| 57 | + var query = new RestQuery(config, master(config), '_Session', |
| 58 | + restWhere, restOptions); |
| 59 | + return query.execute().then((response) => { |
| 60 | + var results = response.results; |
| 61 | + if (results.length !== 1 || !results[0]['user']) { |
| 62 | + return nobody(config); |
| 63 | + } |
| 64 | + var obj = results[0]['user']; |
| 65 | + delete obj.password; |
| 66 | + obj['className'] = '_User'; |
| 67 | + var userObject = Parse.Object.fromJSON(obj); |
| 68 | + cache.setUser(sessionToken, userObject); |
| 69 | + return new Auth(config, false, userObject); |
| 70 | + }); |
| 71 | +}; |
| 72 | + |
| 73 | +// Returns a promise that resolves to an array of role names |
| 74 | +Auth.prototype.getUserRoles = function() { |
| 75 | + if (this.isMaster || !this.user) { |
| 76 | + return Promise.resolve([]); |
| 77 | + } |
| 78 | + if (this.fetchedRoles) { |
| 79 | + return Promise.resolve(this.userRoles); |
| 80 | + } |
| 81 | + if (this.rolePromise) { |
| 82 | + return rolePromise; |
| 83 | + } |
| 84 | + this.rolePromise = this._loadRoles(); |
| 85 | + return this.rolePromise; |
| 86 | +}; |
| 87 | + |
| 88 | +// Iterates through the role tree and compiles a users roles |
| 89 | +Auth.prototype._loadRoles = function() { |
| 90 | + var restWhere = { |
| 91 | + 'users': { |
| 92 | + __type: 'Pointer', |
| 93 | + className: '_User', |
| 94 | + objectId: this.user.id |
| 95 | + } |
| 96 | + }; |
| 97 | + // First get the role ids this user is directly a member of |
| 98 | + var query = new RestQuery(this.config, master(this.config), '_Role', |
| 99 | + restWhere, {}); |
| 100 | + return query.execute().then((response) => { |
| 101 | + var results = response.results; |
| 102 | + if (!results.length) { |
| 103 | + this.userRoles = []; |
| 104 | + this.fetchedRoles = true; |
| 105 | + this.rolePromise = null; |
| 106 | + return Promise.resolve(this.userRoles); |
| 107 | + } |
| 108 | + |
| 109 | + var roleIDs = results.map(r => r.objectId); |
| 110 | + var promises = [Promise.resolve(roleIDs)]; |
| 111 | + for (var role of roleIDs) { |
| 112 | + promises.push(this._getAllRoleNamesForId(role)); |
| 113 | + } |
| 114 | + return Promise.all(promises).then((results) => { |
| 115 | + var allIDs = []; |
| 116 | + for (var x of results) { |
| 117 | + Array.prototype.push.apply(allIDs, x); |
| 118 | + } |
| 119 | + var restWhere = { |
| 120 | + objectId: { |
| 121 | + '$in': allIDs |
| 122 | + } |
| 123 | + }; |
| 124 | + var query = new RestQuery(this.config, master(this.config), |
| 125 | + '_Role', restWhere, {}); |
| 126 | + return query.execute(); |
| 127 | + }).then((response) => { |
| 128 | + var results = response.results; |
| 129 | + this.userRoles = results.map((r) => { |
| 130 | + return 'role:' + r.name; |
| 131 | + }); |
| 132 | + this.fetchedRoles = true; |
| 133 | + this.rolePromise = null; |
| 134 | + return Promise.resolve(this.userRoles); |
| 135 | + }); |
| 136 | + }); |
| 137 | +}; |
| 138 | + |
| 139 | +// Given a role object id, get any other roles it is part of |
| 140 | +// TODO: Make recursive to support role nesting beyond 1 level deep |
| 141 | +Auth.prototype._getAllRoleNamesForId = function(roleID) { |
| 142 | + var rolePointer = { |
| 143 | + __type: 'Pointer', |
| 144 | + className: '_Role', |
| 145 | + objectId: roleID |
| 146 | + }; |
| 147 | + var restWhere = { |
| 148 | + '$relatedTo': { |
| 149 | + key: 'roles', |
| 150 | + object: rolePointer |
| 151 | + } |
| 152 | + }; |
| 153 | + var query = new RestQuery(this.config, master(this.config), '_Role', |
| 154 | + restWhere, {}); |
| 155 | + return query.execute().then((response) => { |
| 156 | + var results = response.results; |
| 157 | + if (!results.length) { |
| 158 | + return Promise.resolve([]); |
| 159 | + } |
| 160 | + var roleIDs = results.map(r => r.objectId); |
| 161 | + return Promise.resolve(roleIDs); |
| 162 | + }); |
| 163 | +}; |
| 164 | + |
| 165 | +module.exports = { |
| 166 | + Auth: Auth, |
| 167 | + master: master, |
| 168 | + nobody: nobody, |
| 169 | + getAuthForSessionToken: getAuthForSessionToken |
| 170 | +}; |
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