angular2-in-memory-web-api/in-memory-backend.service.js

System.register(['@angular/core', '@angular/http', 'rxjs/Observable', 'rxjs/add/operator/delay', './http-status-codes'], function(exports_1, context_1) {
    "use strict";
    var __moduleName = context_1 && context_1.id;
    var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
        var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
        if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
        else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
        return c > 3 && r && Object.defineProperty(target, key, r), r;
    };
    var __metadata = (this && this.__metadata) || function (k, v) {
        if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
    };
    var __param = (this && this.__param) || function (paramIndex, decorator) {
        return function (target, key) { decorator(target, key, paramIndex); }
    };
    var core_1, http_1, Observable_1, http_status_codes_1;
    var SEED_DATA, InMemoryBackendConfig, isSuccess, InMemoryBackendService;
    return {
        setters:[
            function (core_1_1) {
                core_1 = core_1_1;
            },
            function (http_1_1) {
                http_1 = http_1_1;
            },
            function (Observable_1_1) {
                Observable_1 = Observable_1_1;
            },
            function (_1) {},
            function (http_status_codes_1_1) {
                http_status_codes_1 = http_status_codes_1_1;
            }],
        execute: function() {
            /**
            * Seed data for in-memory database
            * Must implement InMemoryDbService.
            */
            exports_1("SEED_DATA", SEED_DATA = new core_1.OpaqueToken('seedData'));
            /**
            *  InMemoryBackendService configuration options
            *  Usage:
            *    provide(InMemoryBackendConfig, {useValue: {delay:600}}),
            */
            InMemoryBackendConfig = (function () {
                function InMemoryBackendConfig(config) {
                    if (config === void 0) { config = {}; }
                    Object.assign(this, {
                        defaultResponseOptions: new http_1.BaseResponseOptions(),
                        delay: 500,
                        delete404: false
                    }, config);
                }
                return InMemoryBackendConfig;
            }());
            exports_1("InMemoryBackendConfig", InMemoryBackendConfig);
            exports_1("isSuccess", isSuccess = function (status) { return (status >= 200 && status < 300); });
            /**
             * Simulate the behavior of a RESTy web api
             * backed by the simple in-memory data store provided by the injected InMemoryDataService service.
             * Conforms mostly to behavior described here:
             * http://www.restapitutorial.com/lessons/httpmethods.html
             *
             * ### Usage
             *
             * Create InMemoryDataService class the implements IInMemoryDataService.
             * Register both this service and the seed data as in:
             * ```
             * // other imports
             * import { HTTP_PROVIDERS, XHRBackend } from 'angular2/http';
             * import { InMemoryBackendConfig, InMemoryBackendService, SEED_DATA } from '../in-memory-backend/in-memory-backend.service';
             * import { InMemoryStoryService } from '../api/in-memory-story.service';
             *
             * @Component({
             *   selector: ...,
             *   templateUrl: ...,
             *   providers: [
             *     HTTP_PROVIDERS,
             *     provide(XHRBackend, { useClass: InMemoryBackendService }),
             *     provide(SEED_DATA, { useClass: InMemoryStoryService }),
             *     provide(InMemoryBackendConfig, { useValue: { delay: 600 } }),
             *   ]
             * })
             * export class AppComponent { ... }
             * ```
             */
            InMemoryBackendService = (function () {
                function InMemoryBackendService(_seedData, config) {
                    this._seedData = _seedData;
                    this._config = new InMemoryBackendConfig();
                    this._resetDb();
                    var loc = this._getLocation('./');
                    this._config.host = loc.host;
                    this._config.rootPath = loc.pathname;
                    Object.assign(this._config, config);
                }
                InMemoryBackendService.prototype.createConnection = function (req) {
                    var res = this._handleRequest(req);
                    var response = new Observable_1.Observable(function (responseObserver) {
                        if (isSuccess(res.status)) {
                            responseObserver.next(res);
                            responseObserver.complete();
                        }
                        else {
                            responseObserver.error(res);
                        }
                        return function () { }; // unsubscribe function
                    });
                    response = response.delay(this._config.delay || 500);
                    return { response: response };
                };
                ////  protected /////
                /**
                 * Process Request and return an Http Response object
                 * in the manner of a RESTy web api.
                 *
                 * Expect URI pattern in the form :base/:collectionName/:id?
                 * Examples:
                 *   api/characters
                 *   api/characters/42
                 *   api/characters.json/42   // ignores the ".json"
                 *   commands/resetDb  // resets the "database"
                 */
                InMemoryBackendService.prototype._handleRequest = function (req) {
                    var _a = this._parseUrl(req.url), base = _a.base, collectionName = _a.collectionName, id = _a.id, resourceUrl = _a.resourceUrl;
                    var reqInfo = {
                        req: req,
                        base: base,
                        collection: this._db[collectionName],
                        collectionName: collectionName,
                        headers: new http_1.Headers({ 'Content-Type': 'application/json' }),
                        id: this._parseId(id),
                        resourceUrl: resourceUrl
                    };
                    var options;
                    try {
                        if ('commands' === reqInfo.base.toLowerCase()) {
                            options = this._commands(reqInfo);
                        }
                        else if (reqInfo.collection) {
                            switch (req.method) {
                                case http_1.RequestMethod.Get:
                                    options = this._get(reqInfo);
                                    break;
                                case http_1.RequestMethod.Post:
                                    options = this._post(reqInfo);
                                    break;
                                case http_1.RequestMethod.Put:
                                    options = this._put(reqInfo);
                                    break;
                                case http_1.RequestMethod.Delete:
                                    options = this._delete(reqInfo);
                                    break;
                                default:
                                    options = this._createErrorResponse(http_status_codes_1.STATUS.METHOD_NOT_ALLOWED, 'Method not allowed');
                                    break;
                            }
                        }
                        else {
                            options = this._createErrorResponse(http_status_codes_1.STATUS.NOT_FOUND, "Collection '" + collectionName + "' not found");
                        }
                    }
                    catch (error) {
                        var err = error.message || error;
                        options = this._createErrorResponse(http_status_codes_1.STATUS.INTERNAL_SERVER_ERROR, "" + err);
                    }
                    options = this._setStatusText(options);
                    if (this._config.defaultResponseOptions) {
                        options = this._config.defaultResponseOptions.merge(options);
                    }
                    return new http_1.Response(options);
                };
                InMemoryBackendService.prototype._clone = function (data) {
                    return JSON.parse(JSON.stringify(data));
                };
                /**
                 * When the `base`="commands", the `collectionName` is the command
                 * Example URLs:
                 *   commands/resetdb   // Reset the "database" to its original state
                 *   commands/config (GET) // Return this service's config object
                 *   commands/config (!GET) // Update the config (e.g. delay)
                 *
                 * Usage:
                 *   http.post('commands/resetdb', null);
                 *   http.get('commands/config');
                 *   http.post('commands/config', '{"delay":1000}');
                 */
                InMemoryBackendService.prototype._commands = function (reqInfo) {
                    var command = reqInfo.collectionName.toLowerCase();
                    var method = reqInfo.req.method;
                    var options;
                    switch (command) {
                        case 'resetdb':
                            this._resetDb();
                            options = new http_1.ResponseOptions({ status: http_status_codes_1.STATUS.OK });
                            break;
                        case 'config':
                            if (method === http_1.RequestMethod.Get) {
                                options = new http_1.ResponseOptions({
                                    body: this._clone(this._config),
                                    status: http_status_codes_1.STATUS.OK
                                });
                            }
                            else {
                                // Be nice ... any other method is a config update
                                var body = JSON.parse(reqInfo.req.text() || '{}');
                                Object.assign(this._config, body);
                                options = new http_1.ResponseOptions({ status: http_status_codes_1.STATUS.NO_CONTENT });
                            }
                            break;
                        default:
                            options = this._createErrorResponse(http_status_codes_1.STATUS.INTERNAL_SERVER_ERROR, "Unknown command \"" + command + "\"");
                    }
                    return options;
                };
                InMemoryBackendService.prototype._createErrorResponse = function (status, message) {
                    return new http_1.ResponseOptions({
                        body: { 'error': "" + message },
                        headers: new http_1.Headers({ 'Content-Type': 'application/json' }),
                        status: status
                    });
                };
                InMemoryBackendService.prototype._delete = function (_a) {
                    var id = _a.id, collection = _a.collection, collectionName = _a.collectionName, headers = _a.headers;
                    if (!id) {
                        return this._createErrorResponse(http_status_codes_1.STATUS.NOT_FOUND, "Missing \"" + collectionName + "\" id");
                    }
                    var exists = this._removeById(collection, id);
                    return new http_1.ResponseOptions({
                        headers: headers,
                        status: (exists || !this._config.delete404) ? http_status_codes_1.STATUS.NO_CONTENT : http_status_codes_1.STATUS.NOT_FOUND
                    });
                };
                InMemoryBackendService.prototype._findById = function (collection, id) {
                    return collection.find(function (item) { return item.id === id; });
                };
                InMemoryBackendService.prototype._genId = function (collection) {
                    // assumes numeric ids
                    var maxId = 0;
                    collection.reduce(function (prev, item) {
                        maxId = Math.max(maxId, typeof item.id === 'number' ? item.id : maxId);
                    }, null);
                    return maxId + 1;
                };
                InMemoryBackendService.prototype._get = function (_a) {
                    var id = _a.id, collection = _a.collection, collectionName = _a.collectionName, headers = _a.headers;
                    var data = (id) ? this._findById(collection, id) : collection;
                    if (!data) {
                        return this._createErrorResponse(http_status_codes_1.STATUS.NOT_FOUND, "'" + collectionName + "' with id='" + id + "' not found");
                    }
                    return new http_1.ResponseOptions({
                        body: { data: this._clone(data) },
                        headers: headers,
                        status: http_status_codes_1.STATUS.OK
                    });
                };
                InMemoryBackendService.prototype._getLocation = function (href) {
                    var l = document.createElement('a');
                    l.href = href;
                    return l;
                };
                ;
                InMemoryBackendService.prototype._indexOf = function (collection, id) {
                    return collection.findIndex(function (item) { return item.id === id; });
                };
                // tries to parse id as integer; returns input id if not an integer.
                InMemoryBackendService.prototype._parseId = function (id) {
                    if (!id) {
                        return null;
                    }
                    var idNum = parseInt(id, 10);
                    return isNaN(idNum) ? id : idNum;
                };
                InMemoryBackendService.prototype._parseUrl = function (url) {
                    try {
                        var loc = this._getLocation(url);
                        var drop = this._config.rootPath.length;
                        var urlRoot = '';
                        if (loc.host !== this._config.host) {
                            // url for a server on a different host!
                            // assume it's collection is actually here too.
                            drop = 1; // the leading slash
                            urlRoot = loc.protocol + '//' + loc.host + '/';
                        }
                        var path = loc.pathname.substring(drop);
                        var _a = path.split('/'), base = _a[0], collectionName = _a[1], id = _a[2];
                        var resourceUrl = urlRoot + base + '/' + collectionName + '/';
                        collectionName = collectionName.split('.')[0]; // ignore anything after the '.', e.g., '.json'
                        return { base: base, id: id, collectionName: collectionName, resourceUrl: resourceUrl };
                    }
                    catch (err) {
                        var msg = "unable to parse url '" + url + "'; original error: " + err.message;
                        throw new Error(msg);
                    }
                };
                InMemoryBackendService.prototype._post = function (_a) {
                    var collection = _a.collection, headers = _a.headers, id = _a.id, req = _a.req, resourceUrl = _a.resourceUrl;
                    var item = JSON.parse(req.text());
                    if (!item.id) {
                        item.id = id || this._genId(collection);
                    }
                    // ignore the request id, if any. Alternatively,
                    // could reject request if id differs from item.id
                    id = item.id;
                    var existingIx = this._indexOf(collection, id);
                    if (existingIx > -1) {
                        collection[existingIx] = item;
                        return new http_1.ResponseOptions({
                            headers: headers,
                            status: http_status_codes_1.STATUS.NO_CONTENT
                        });
                    }
                    else {
                        collection.push(item);
                        headers.set('Location', resourceUrl + '/' + id);
                        return new http_1.ResponseOptions({
                            headers: headers,
                            body: { data: this._clone(item) },
                            status: http_status_codes_1.STATUS.CREATED
                        });
                    }
                };
                InMemoryBackendService.prototype._put = function (_a) {
                    var id = _a.id, collection = _a.collection, collectionName = _a.collectionName, headers = _a.headers, req = _a.req;
                    var item = JSON.parse(req.text());
                    if (!id) {
                        return this._createErrorResponse(http_status_codes_1.STATUS.NOT_FOUND, "Missing '" + collectionName + "' id");
                    }
                    if (id !== item.id) {
                        return this._createErrorResponse(http_status_codes_1.STATUS.BAD_REQUEST, "\"" + collectionName + "\" id does not match item.id");
                    }
                    var existingIx = this._indexOf(collection, id);
                    if (existingIx > -1) {
                        collection[existingIx] = item;
                        return new http_1.ResponseOptions({
                            headers: headers,
                            status: http_status_codes_1.STATUS.NO_CONTENT // successful; no content
                        });
                    }
                    else {
                        collection.push(item);
                        return new http_1.ResponseOptions({
                            body: { data: this._clone(item) },
                            headers: headers,
                            status: http_status_codes_1.STATUS.CREATED
                        });
                    }
                };
                InMemoryBackendService.prototype._removeById = function (collection, id) {
                    var ix = this._indexOf(collection, id);
                    if (ix > -1) {
                        collection.splice(ix, 1);
                        return true;
                    }
                    return false;
                };
                /**
                 * Reset the "database" to its original state
                 */
                InMemoryBackendService.prototype._resetDb = function () {
                    this._db = this._seedData.createDb();
                };
                InMemoryBackendService.prototype._setStatusText = function (options) {
                    try {
                        var statusCode = http_status_codes_1.STATUS_CODE_INFO[options.status];
                        options['statusText'] = statusCode ? statusCode.text : 'Unknown Status';
                        return options;
                    }
                    catch (err) {
                        return new http_1.ResponseOptions({
                            status: http_status_codes_1.STATUS.INTERNAL_SERVER_ERROR,
                            statusText: 'Invalid Server Operation'
                        });
                    }
                };
                InMemoryBackendService = __decorate([
                    __param(0, core_1.Inject(SEED_DATA)),
                    __param(1, core_1.Inject(InMemoryBackendConfig)),
                    __param(1, core_1.Optional()), 
                    __metadata('design:paramtypes', [Object, Object])
                ], InMemoryBackendService);
                return InMemoryBackendService;
            }());
            exports_1("InMemoryBackendService", InMemoryBackendService);
        }
    }
});
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