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relution-sdk

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Relution Software Development Kit for TypeScript and JavaScript

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/* * @file web/http.ts * Relution SDK * * Created by Thomas Beckmann on 28.04.2016 * Copyright 2016 M-Way Solutions GmbH * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * @module web */ /** */ "use strict"; var Q = require('q'); var _ = require('lodash'); var auth = require('../security/auth'); var diag = require('../core/diag'); var http = require('http'); var init = require('../core/init'); var offline = require('./offline'); var request = require('request'); var server = require('../security/server'); var urls = require('./urls'); // require request.js to manage cookies for us var requestDefaults = { json: true, jar: true, withCredentials: true }; var requestWithDefaults = request.defaults(requestDefaults); /** * drives an HTTP request against the Relution server. * * Behavior of this method is simplified from most HTTP/AJAX implementations: * - When the HTTP request succeeds the resulting promise resolves to the response body. * - In case of a network Error the promise resolves to an HttpError object providing `requestUrl` * but neither `statusCode` nor `statusMessage`. * - In case of HTTP failure the resulting promise is rejected to an HttpError-like object carrying * the properties `requestUrl`, `statusCode` and `statusMessage`. * - If the server responds a JSON, it is parsed and assumed to be an HttpError-like object. The * object is augmented by the properties as defined above. * - Otherwise the body is stored as `message` of an HttpError object created. Again, the properties * above are provided. * - Finally, in case of HTTP failure with the server not providing any response body, the HttpError * `message` is set to the `statusMessage`. * * Thus, to differentiate network failures from server-side failures the `statusCode` of the * HttpError rejection is to being used. For deeper inspection provide an * [[options.responseCallback]]. * * ```javascript * Relution.init({ * serverUrl: 'http://localhost:8080', * organization: 'myOrga' * }); * * let httpOptions: HttpOptions = {method: 'GET', url: 'api/v1/posts'}; * * //usage as Promise * Relution.web.ajax(httpOptions) * .then((resp) => console.log('posts', resp);) * .catch((e:Relution.web.HttpError) => console.error(e.message, e)) * .finally(() => console.log('loading complete!')); * * // as Observable * Observable.fromPromise(Relution.web.ajax(httpOptions)).subscribe( * (resp: any) => console.log('posts', resp), * (e:Relution.web.HttpError) => console.error(e.message, e);, * () => console.log('loading complete!') * ) * ``` * @param options of request, including target `url`. * @return {Q.Promise} of response body, in case of failure rejects to an HttpError object * including `requestUrl`, `statusCode` and `statusMessage`. */ function ajax(options) { var serverUrl = urls.resolveServer(options.url, options); var serverObj = server.Server.getInstance(serverUrl); if (!serverObj.sessionUserUuid && serverObj.credentials) { // not logged in var credentials_1 = serverObj.credentials; serverObj.credentials = null; return login(credentials_1, { serverUrl: serverUrl }).then(function () { diag.debug.assert(function () { return !!serverObj.sessionUserUuid; }); diag.debug.assert(function () { return serverObj.credentials == credentials_1; }); return ajax(options); // repeat after login }); } // process options var currentOptions = serverObj.applyOptions({ serverUrl: serverUrl, agentOptions: options.agentOptions || init.initOptions.agentOptions, agentClass: options.agentClass || init.initOptions.agentClass, // options taking effect at request time application: options.application || init.initOptions.application, tenantOrga: options.tenantOrga || init.initOptions.tenantOrga }); // resolve target url var url = urls.resolveUrl(options.url, currentOptions); diag.debug.debug(options.method + ' ' + url); diag.debug.assert(function () { return url.substr(0, serverUrl.length) === serverUrl; }); var requestCallback = options.requestCallback || _.identity; var responseCallback = options.responseCallback || _.identity; options = _.clone(options); options.agentOptions = currentOptions.agentOptions; options.agentClass = currentOptions.agentClass; if (currentOptions.clientCertificate) { // apply certificate options (must copy options.agentOptions) options.agentOptions = _.defaults({}, currentOptions.clientCertificate, options.agentOptions); } var headers = {}; if (serverObj.sessionUserUuid) { // add X-Gofer-User header so that server may check we are running under correct identity headers['X-Gofer-User'] = serverObj.sessionUserUuid; } if (currentOptions.clientApp) { // add X-Relution-ClientApp for server-side analytics headers['X-Relution-ClientApp'] = currentOptions.clientApp; } if (!_.isEmpty(headers)) { options.headers = _.defaults(headers, options.headers); } return Q.Promise(function (resolveResult, rejectResult) { var promiseResponse = Q.Promise(function (resolveResponse, rejectResponse) { var resp; var req; try { req = requestWithDefaults(url, options, function (error, response, body) { if (response === void 0) { response = resp; } // node.js assigns status string as body for status codes not having body data if (response && response.statusCode === 202) { diag.debug.assert(body === http.STATUS_CODES[202], body); body = undefined; // resolves promise to undefined below } // error processing if (!error && response && response.statusCode >= 400) { if (_.isError(body)) { // correct but practically impossible error = body; } else if (_.isString(body)) { // use plain-text as Error message error = new Error(body); } else if (_.isObjectLike(body)) { // body is object representation of server-side error or exception, // converting to true Error object here error = new Error(response.statusMessage); diag.debug.assert(function () { return !_.isArray(body); }, 'kicks in for array responses as well, not sure if this is desirable'); _.extend(error, body); } else { // handles numbers, booleans, etc. assigning as cause of failure error = new Error(response.statusMessage); if (!_.isUndefined(body)) { error.cause = body; } } } if (error) { // completes HttpError construction diag.debug.assertIsError(error, 'should operate true Error instances'); error.requestUrl = url; if (response) { error.statusCode = response.statusCode; error.statusMessage = response.statusMessage; Object.defineProperty(error, 'rawResponse', { value: response, enumerable: false }); } Object.defineProperty(error, 'rawRequest', { value: req, enumerable: false }); } if (!response) { // network connectivity problem serverObj.serverInfos = null; diag.debug.assertIsError(error); if (promiseResponse) { rejectResponse(error); // will also rejectResult(error) } else { rejectResult(error); // promiseResponse not constructed yet } } else { // server information serverObj.serverInfos = { version: response.headers['x-relution-version'], description: response.headers['x-server'] }; if (response.statusCode === 503 || response.statusCode === 500 && error.className === 'java.util.concurrent.TimeoutException') { // 503 (service unavailable) indicates the server is temporarily overloaded, and unable // handling the request. This happens when async delegation timed out on the Java side, // usually after about 2 minutes. In this case retry the request until we are done... diag.debug.info('server overloaded, retrying request.'); // here promiseResponse must have been resolved already, // we chain anyways because of error propagation promiseResponse.thenResolve(ajax(options)).done(resolveResult, rejectResult); return; // early exit as result is handled by done call above } else { // logon session processing var sessionUserUuid = response.headers['x-gofer-user']; if (sessionUserUuid) { serverObj.sessionUserUuid = sessionUserUuid; } else if (response.statusCode === 401) { // apparently our session is lost! serverObj.sessionUserUuid = null; diag.debug.assert(function () { return !!error; }); diag.debug.warn('server session is lost!', error); var credentials = serverObj.credentials; if (credentials) { // recover by attempting login, // here promiseResponse must have been resolved already, // we chain anyways because of error propagation serverObj.credentials = null; promiseResponse.thenResolve(login(credentials, { serverUrl: serverUrl }).then(function () { diag.debug.assert(function () { return !!serverObj.sessionUserUuid; }); diag.debug.info('server session recovered.'); return ajax(options); })).done(resolveResult, rejectResult); return; // early exit as result is handled by done call above } } } } // completes the chain propagating results, must be skipped when request is retried above if (promiseResponse) { promiseResponse.then(function (responseResult) { diag.debug.assert(function () { return responseResult === resp; }, 'definition of behavior in case ' + 'of proxying the original response is reserved for future extension!'); if (error) { rejectResult(error); } else { resolveResult(body); } }, function (responseError) { rejectResult(responseError); }).done(); } }); } catch (error) { // path taken when request.js throws return rejectResult(error); } // transport response try { Q(requestCallback(req)).then(function (request) { if (request === void 0) { request = req; } request.on('response', function (response) { if (!resp) { resp = response; resolveResponse(responseCallback(resp)); } }); return request; }).done(); } catch (error) { // path taken when requestCallback throws return rejectResponse(error); } }); }); } exports.ajax = ajax; /** * logs into a Relution server. * * Notice, specifying `offlineCapable=true` in the options will store the login response locally on * the device when online and the login succeeded. When offline, the option will reuse the stored * response. Data encryption is used guaranteeing both secrecy of login data and verification of * the credentials provided. * * @param credentials to use. * @param loginOptions overwriting [[init]] defaults. * @return {Q.Promise<LoginResponse>} of login response. * * @example * ```javascript * * import * as Relution from 'relution-sdk'; * //config * Relution.init({ * serverUrl: 'http://localhost:8080' * }); * * let credentials = { * userName: 'myusername', * password: 'mypassword' * }; * * //usage * * // Promise * Relution.web.login(credentials) * .then((resp) => console.log('resp', resp);) * .catch((e:Error) => console.error(e.message, e)) * .finally(() => console.log('complete')); * * //Observable * Observable.fromPromise(Relution.web.login(credentials)).subscribe( * (resp: any) => console.log('resp', resp), * (e:Error) => console.error(e.message, e);, * () => console.log('complete') * ) * ``` */ function login(credentials, loginOptions) { if (loginOptions === void 0) { loginOptions = {}; } var wasOfflineLogin = false; var serverUrl = urls.resolveServer('/', loginOptions); var serverObj = server.Server.getInstance(serverUrl); if (serverObj.sessionUserUuid) { // logged in already return logout({ serverUrl: serverUrl }).then(function () { diag.debug.assert(function () { return !serverObj.sessionUserUuid; }); return login(credentials, loginOptions); // repeat after logout }); } else if (serverObj.credentials) { // had credentials but no session, so we were logged in offline wasOfflineLogin = true; } // process options var currentOptions = serverObj.applyOptions({ serverUrl: serverUrl, agentOptions: loginOptions.agentOptions || init.initOptions.agentOptions, agentClass: loginOptions.agentClass || init.initOptions.agentClass, // options taking effect at login time clientApp: loginOptions.clientApp || init.initOptions.clientApp, logonCallback: loginOptions.logonCallback || init.initOptions.logonCallback, clientCertificate: loginOptions.clientCertificate || init.initOptions.clientCertificate }); var logonCallback = currentOptions.logonCallback || _.identity; return ajax(_.defaults({ serverUrl: serverUrl, method: 'POST', url: '/gofer/security/rest/auth/login', body: credentials }, currentOptions)).then(function (response) { // real physical logon, ajax call sets sessionUserUuid if (!serverObj.sessionUserUuid) { diag.debug.warn('BUG: Relution did not set X-Gofer-User response header'); serverObj.sessionUserUuid = response.user.uuid; } diag.debug.assert(function () { return serverObj.sessionUserUuid === response.user.uuid; }); return response; }, function (error) { // offline login response if (!error.statusCode && loginOptions.offlineCapable) { // ajax timeout -> offline login attempt diag.debug.assert(function () { return !serverObj.sessionUserUuid; }, 'no physical login, as otherwise logonCallback would be executed'); return offline.fetchOfflineLogin(credentials, currentOptions).then(function (loginResponse) { if (!loginResponse) { // when there is no persistent data available, aka. this is the initial login attempt, // keep saying the server is offline... return Q.reject(error); } return loginResponse; }, function (offlineError) { // most likely the password entered was incorrect, // make sure the offlineError indicates the server is unavailable as well diag.debug.assert(function () { return !offlineError.statusCode; }); diag.debug.assert(function () { return !offlineError.requestUrl; }); offlineError.requestUrl = error.requestUrl; diag.debug.assert(function () { return !offlineError.cause; }); offlineError.cause = error; // we rethrow the annotated error of decoding the stored response, // because the network error just indicates we are offline and does // not mention the credentials being incorrect as this one does... return Q.reject(offlineError); }); } else if (error.statusCode && wasOfflineLogin) { // server side rejection, clear login data so that subsequent offline logins fail as well return offline.clearOfflineLogin(credentials, currentOptions).catch(function (offlineError) { // this is bad but we can not do much about it diag.debug.warn('failed erasing offline login data', offlineError); return Q.reject(error); }); } return Q.reject(error); }).then(function (response) { // switch current server if ('roles' in response.roles) { // fixes a defect of Java implementation response.roles = response.roles['roles']; } serverObj.authorization = { name: response.user.uuid, roles: _.map(response.roles, function (role) { return role.uuid; }) }; serverObj.organization = response.organization; serverObj.user = response.user; serverObj.credentials = credentials; server.setCurrentServer(serverObj); return response; }).then(function (response) { // this is the earliest point at which library state reflects correct authorization, etc. // Thus, the logonCallback may execute here now, but only if we are online actually... if (!serverObj.sessionUserUuid) { return response; // offline } // we have a session logged into this user diag.debug.assert(function () { return serverObj.sessionUserUuid === server.getCurrentAuthorization().name; }); // run logonCallback on response data and eventually store resultant object for offline login, // because this way the callback may add information to the response object that will also be // persisted and made available again when offline! return Q(logonCallback(response)).then(function (logonInfos) { if (logonInfos === void 0) { logonInfos = response; } if (logonInfos && logonInfos !== response) { // any data returned by the logonCallback may be stored here response.logonInfos = logonInfos; } // store offline login response if (loginOptions.offlineCapable || wasOfflineLogin) { // initial store or update of login data return offline.storeOfflineLogin(credentials, currentOptions, response).catch(function (offlineError) { diag.debug.warn('offline login store failed', offlineError); return response; }); } return response; }, function (error) { // logon callback failed, must logout to avoid making ajax calls in an unknown backend state return logout({ serverUrl: serverUrl }).catch(function (logoutError) { diag.debug.error('failed to logout after login failure', logoutError); return Q.reject(error); }).finally(function () { // logout processing must leave us with no user session diag.debug.assert(function () { return !serverObj.sessionUserUuid; }); }); }); }); } exports.login = login; ; /** * logs out of a Relution server. * * For explicit logouts (trigger by app user pressing a logout button, for example) specifying * `offlineCapable = true` will drop any persisted offline login data for the server logging out * of. * * @param logoutOptions overwriting [[init]] defaults. * @return {Q.Promise<void>} of logout response. * * @example * ```javascript * * Relution.web.logout() * .then((resp) => console.log('resp', resp);) * .catch((e:Error) => console.error(e.message, e)) * .finally(() => console.log('bye bye')); * * //Observable * Observable.fromPromise(Relution.web.logout()).subscribe( * (resp: any) => console.log('resp', resp), * (e:Error) => console.error(e.message, e);, * () => console.log('bye bye') * ) * ``` */ function logout(logoutOptions) { if (logoutOptions === void 0) { logoutOptions = {}; } var serverUrl = urls.resolveServer('/', logoutOptions); var serverObj = server.Server.getInstance(serverUrl); // process options var currentOptions = serverObj.applyOptions({ serverUrl: serverUrl, agentOptions: logoutOptions.agentOptions || init.initOptions.agentOptions, agentClass: logoutOptions.agentClass || init.initOptions.agentClass, }); return ajax(_.defaults({ serverUrl: serverUrl, method: 'POST', url: '/gofer/security/rest/auth/logout', body: {} }, currentOptions)).catch(function (error) { if (error.statusCode === 422) { // REST-based logout URL currently is broken reporting a 422 in all cases return ajax(_.defaults({ serverUrl: serverUrl, method: 'GET', url: '/gofer/security-logout' }, currentOptions)).then(function (result) { diag.debug.warn('BUG: resorted to classic PATH-based logout as REST-based logout failed:', error); return result; }, function (error2) { return Q.reject(error2.statusCode === 422 ? error : error2); }); } return Q.reject(error); }).catch(function (error) { // ignore network failures on timeout, server forgets on session timeout anyways if (!error.statusCode) { return Q.resolve(undefined); } return Q.reject(error); }).finally(function () { // eventually erase offline login data if (logoutOptions.offlineCapable) { // requested to erase login data return offline.clearOfflineLogin(serverObj.credentials, currentOptions).catch(function (offlineError) { diag.debug.warn('failed erasing offline login data', offlineError); return Q.resolve(undefined); }); } }).finally(function () { // forget everything about it serverObj.credentials = null; serverObj.authorization = auth.ANONYMOUS_AUTHORIZATION; serverObj.organization = null; serverObj.user = null; serverObj.sessionUserUuid = null; }); } exports.logout = logout; //# 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* @file web/http.ts\n * Relution SDK\n *\n * Created by Thomas Beckmann on 28.04.2016\n * Copyright 2016 M-Way Solutions GmbH\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/**\n * @module web\n */\n/** */\n\nimport * as Q from 'q';\nimport * as _ from 'lodash';\nimport * as auth from '../security/auth';\nimport * as diag from '../core/diag';\nimport * as http from 'http';\nimport * as init from '../core/init';\nimport * as offline from './offline';\nimport * as request from 'request';\nimport * as roles from '../security/roles';\nimport * as server from '../security/server';\nimport * as urls from './urls';\n\n// require request.js to manage cookies for us\nlet requestDefaults = {\n  json: true,\n  jar: true,\n  withCredentials: true\n};\nlet requestWithDefaults = request.defaults(requestDefaults);\n\n/**\n * callback allowing customizing an object not immediately available at time of call.\n *\n * @param object for inspection or customization.\n * @return promise or object on same deferred object.\n */\nexport interface HttpCallback<T> {\n  (value: T): Q.Promise<T> | T;\n}\n\n/**\n * type representing a raw request.\n */\nexport type HttpRequest = request.Request;\n/**\n * type representing a raw response.\n */\nexport type HttpResponse = http.IncomingMessage;\n\n/**\n * named parameters of the [[http]] function.\n */\nexport interface HttpOptions extends request.CoreOptions, request.UrlOptions,\n    init.ServerInitOptions {\n  /**\n   * optional callback allowing to customize the client request in more detail than provided by\n   * default.\n   */\n  requestCallback?: HttpCallback<HttpRequest>;\n  /**\n   * optional callback allowing to inspect the server response in more detail than provided by\n   * default.\n   */\n  responseCallback?: HttpCallback<HttpResponse>;\n}\n\n/**\n * failure of an ajax request.\n *\n * This type can be used as type annotation of the error the Promise returned by ajax is rejected\n * with.\n *\n * @see ajax\n */\nexport interface HttpError extends Error {\n  /**\n   * fully resolved url the request was sent to.\n   */\n  requestUrl?: string;\n\n  /**\n   * HTTP status code of failure.\n   */\n  statusCode?: number;\n  /**\n   * HTTP status message of failure.\n   */\n  statusMessage?: string;\n\n  /**\n   * in many cases the Relution server reports here the fully qualified name of a Java Exception\n   * that may be used to further differentiate the error.\n   */\n  className?: string;\n  /**\n   * may be set to some arbitrary value describing the cause of failure, mostly present when\n   * transporting Java Exception objects.\n   */\n  cause?: any;\n\n  /**\n   * details of request failed.\n   *\n   * This is a non-enumerable property and thus not part of the JSON representation of the failure.\n   * It is provided for informal purposes as a debugging aid only. Client code should not rely on\n   * this value.\n   *\n   * @see response\n   */