140 lines
3.6 KiB
JavaScript
140 lines
3.6 KiB
JavaScript
const _ = require('lodash');
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const debug = require('ghost-ignition').debug('services:url:urls');
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const localUtils = require('./utils');
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const common = require('../../lib/common');
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/**
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* This class keeps track of all urls in the system.
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* Each resource has exactly one url. Each url is owned by exactly one url generator id.
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* This is a connector for url generator and resources.
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* Stores relative urls by default.
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*
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* We have to have a centralised place where we keep track of all urls, otherwise
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* we will never know if we generate the same url twice. Furthermore, it's easier
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* to ask a centralised class instance if you want a url for a resource than
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* iterating over all url generators and asking for it.
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* You can easily ask `this.urls[resourceId]`.
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*/
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class Urls {
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constructor() {
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this.urls = {};
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}
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/**
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* @description Add a url to the system.
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* @param {Object} options
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*/
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add(options) {
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const url = options.url;
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const generatorId = options.generatorId;
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const resource = options.resource;
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debug('cache', url);
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if (this.urls[resource.data.id]) {
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common.logging.error(new common.errors.InternalServerError({
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message: 'This should not happen.',
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code: 'URLSERVICE_RESOURCE_DUPLICATE'
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}));
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this.removeResourceId(resource.data.id);
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}
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this.urls[resource.data.id] = {
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url: url,
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generatorId: generatorId,
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resource: resource
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};
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// @NOTE: Notify the whole system. Currently used for sitemaps service.
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common.events.emit('url.added', {
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url: {
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relative: url,
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absolute: localUtils.createUrl(url, true)
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},
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resource: resource
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});
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}
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/**
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* @description Get url by resource id.
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* @param {String} id
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* @returns {Object}
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*/
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getByResourceId(id) {
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return this.urls[id];
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}
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/**
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* @description Get all urls by generator id.
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* @param {String} generatorId
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* @returns {Array}
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*/
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getByGeneratorId(generatorId) {
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return _.reduce(Object.keys(this.urls), (toReturn, resourceId) => {
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if (this.urls[resourceId].generatorId === generatorId) {
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toReturn.push(this.urls[resourceId]);
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}
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return toReturn;
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}, []);
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}
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/**
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* @description Get by url.
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*
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* @NOTE:
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* It's is in theory possible that:
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*
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* - resource1 -> /welcome/
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* - resource2 -> /welcome/
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*
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* But depending on the routing registration, you will always serve e.g. resource1,
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* because the router it belongs to was registered first.
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*/
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getByUrl(url) {
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return _.reduce(Object.keys(this.urls), (toReturn, resourceId) => {
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if (this.urls[resourceId].url === url) {
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toReturn.push(this.urls[resourceId]);
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}
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return toReturn;
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}, []);
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}
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/**
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* @description Remove url.
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* @param id
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*/
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removeResourceId(id) {
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if (!this.urls[id]) {
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return;
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}
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debug('removed', this.urls[id].url, this.urls[id].generatorId);
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common.events.emit('url.removed', {
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url: this.urls[id].url,
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resource: this.urls[id].resource
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});
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delete this.urls[id];
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}
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/**
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* @description Reset instance.
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*/
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reset() {
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this.urls = {};
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}
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/**
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* @description Soft reset instance.
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*/
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softReset() {
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this.urls = {};
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}
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}
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module.exports = Urls;
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