84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
/*
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* Copyright (c) 2016 Hewlett Packard Enterprise Development L.P.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
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* the License for the specific language governing permissions and limitations
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* under the License.
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*/
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import Http from './http';
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export default class AbstractService {
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/**
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* This class provides an abstract implementation of our services, which includes logic common to
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* all of our services.
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*
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* @param {string} endpointUrl The endpoint URL.
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* @param {Array} supportedVersions The list of all supported versions.
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*/
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constructor (endpointUrl, supportedVersions) {
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this._endpointUrl = endpointUrl;
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this._supportedVersions = supportedVersions;
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}
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/**
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* Our HTTP service instance.
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*
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* @returns {Http} Our HTTP service instance.
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*/
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get http () {
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if (!this._http) {
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this._http = new Http();
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}
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return this._http;
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}
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/**
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* List of all supported versions.
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*
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* @returns {Array} The list of all supported versions, or empty array.
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*/
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get supportedVersions () {
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return this._supportedVersions || [];
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}
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/**
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* Retrieve all the API versions available.
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*
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* @returns {Promise.<T>} A promise that will resolve with the list of API versions.
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*/
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versions () {
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return this.http
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.httpGet(this._endpointUrl)
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.then((response) => response.json())
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.then((body) => body.versions);
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}
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/**
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* Retrieve the API version declaration that is currently in use by this instance.
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*
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* @returns {Promise.<T>} A promise that will resolve with the specific API version.
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*/
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version () {
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return this
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.versions()
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.then((versions) => {
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for (let version of versions) {
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if (this.supportedVersions.indexOf(version.id) > -1) {
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return version;
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}
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}
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throw new Error("No supported API version available.");
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});
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}
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}
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