132 lines
8.2 KiB
HTML
132 lines
8.2 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<title>JSDoc: Source: services/dynamic/json-path.js</title>
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<body>
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<div id="main">
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<h1 class="page-title">Source: services/dynamic/json-path.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* @module
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*/
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'use strict'
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const Joi = require('joi')
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const jp = require('jsonpath')
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const { renderDynamicBadge, errorMessages } = require('../dynamic-common')
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const { InvalidParameter, InvalidResponse } = require('..')
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/**
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* Dynamic service class factory which wraps {@link module:core/base-service/base~BaseService} with support of {@link https://jsonpath.com/|JSONPath}.
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*
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* @param {Function} superclass class to extend
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* @returns {Function} wrapped class
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*/
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module.exports = superclass =>
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class extends superclass {
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static category = 'dynamic'
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static defaultBadgeData = { label: 'custom badge' }
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/**
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* Request data from an upstream API, transform it to JSON and validate against a schema
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*
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* @param {object} attrs Refer to individual attrs
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* @param {Joi} attrs.schema Joi schema to validate the response transformed to JSON
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* @param {string} attrs.url URL to request
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* @param {object} [attrs.errorMessages={}] Key-value map of status codes
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* and custom error messages e.g: `{ 404: 'package not found' }`.
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* This can be used to extend or override the
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* [default](https://github.com/badges/shields/blob/master/services/dynamic-common.js#L8)
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* @returns {object} Parsed response
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*/
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async fetch({ schema, url, errorMessages }) {
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throw new Error(
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`fetch() function not implemented for ${this.constructor.name}`
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)
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}
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async handle(namedParams, { url, query: pathExpression, prefix, suffix }) {
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const data = await this.fetch({
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schema: Joi.any(),
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url,
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errorMessages,
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})
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// JSONPath only works on objects and arrays.
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// https://github.com/badges/shields/issues/4018
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if (typeof data !== 'object') {
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throw new InvalidResponse({
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prettyMessage: 'resource must contain an object or array',
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})
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}
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let values
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try {
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values = jp.query(data, pathExpression)
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} catch (e) {
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const { message } = e
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if (
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message.startsWith('Lexical error') ||
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message.startsWith('Parse error') ||
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message.includes('Unexpected token')
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) {
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throw new InvalidParameter({
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prettyMessage: 'unparseable jsonpath query',
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})
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} else {
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throw e
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}
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}
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if (!values.length) {
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throw new InvalidResponse({ prettyMessage: 'no result' })
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}
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return renderDynamicBadge({ value: values, prefix, suffix })
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}
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}
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</code></pre>
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</article>
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</section>
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</div>
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<nav>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-badge-maker.html">badge-maker</a></li><li><a href="module-core_base-service_base.html">core/base-service/base</a></li><li><a href="module-core_base-service_base-graphql.html">core/base-service/base-graphql</a></li><li><a href="module-core_base-service_base-json.html">core/base-service/base-json</a></li><li><a href="module-core_base-service_base-svg-scraping.html">core/base-service/base-svg-scraping</a></li><li><a href="module-core_base-service_base-xml.html">core/base-service/base-xml</a></li><li><a href="module-core_base-service_base-yaml.html">core/base-service/base-yaml</a></li><li><a href="module-core_base-service_errors.html">core/base-service/errors</a></li><li><a href="module-core_base-service_graphql.html">core/base-service/graphql</a></li><li><a href="module-core_server_server.html">core/server/server</a></li><li><a href="module-core_service-test-runner_create-service-tester.html">core/service-test-runner/create-service-tester</a></li><li><a href="module-core_service-test-runner_icedfrisby-shields.html">core/service-test-runner/icedfrisby-shields</a></li><li><a href="module-core_service-test-runner_infer-pull-request.html">core/service-test-runner/infer-pull-request</a></li><li><a href="module-core_service-test-runner_runner.html">core/service-test-runner/runner</a></li><li><a href="module-core_service-test-runner_service-tester.html">core/service-test-runner/service-tester</a></li><li><a href="module-core_service-test-runner_services-for-title.html">core/service-test-runner/services-for-title</a></li><li><a href="module-core_token-pooling_token-pool.html">core/token-pooling/token-pool</a></li><li><a href="module-services_dynamic_json-path.html">services/dynamic/json-path</a></li><li><a href="module-services_steam_steam-base.html">services/steam/steam-base</a></li></ul><h3>Classes</h3><ul><li><a href="module.exports.html">exports</a></li><li><a href="module-core_base-service_base-graphql-BaseGraphqlService.html">BaseGraphqlService</a></li><li><a href="module-core_base-service_base-json-BaseJsonService.html">BaseJsonService</a></li><li><a href="module-core_base-service_base-svg-scraping-BaseSvgScrapingService.html">BaseSvgScrapingService</a></li><li><a href="module-core_base-service_base-xml-BaseXmlService.html">BaseXmlService</a></li><li><a href="module-core_base-service_base-yaml-BaseYamlService.html">BaseYamlService</a></li><li><a href="module-core_base-service_base-BaseService.html">BaseService</a></li><li><a href="module-core_base-service_errors-Deprecated.html">Deprecated</a></li><li><a href="module-core_base-service_errors-ImproperlyConfigured.html">ImproperlyConfigured</a></li><li><a href="module-core_base-service_errors-Inaccessible.html">Inaccessible</a></li><li><a href="module-core_base-service_errors-InvalidParameter.html">InvalidParameter</a></li><li><a href="module-core_base-service_errors-InvalidResponse.html">InvalidResponse</a></li><li><a href="module-core_base-service_errors-NotFound.html">NotFound</a></li><li><a href="module-core_base-service_errors-ShieldsRuntimeError.html">ShieldsRuntimeError</a></li><li><a href="module-core_server_server-Server.html">Server</a></li><li><a href="module-core_service-test-runner_runner-Runner.html">Runner</a></li><li><a href="module-core_service-test-runner_service-tester-ServiceTester.html">ServiceTester</a></li><li><a href="module-core_token-pooling_token-pool-Token.html">Token</a></li><li><a href="module-core_token-pooling_token-pool-TokenPool.html">TokenPool</a></li><li><a href="module-services_steam_steam-base-BaseSteamAPI.html">BaseSteamAPI</a></li></ul><h3>Tutorials</h3><ul><li><a href="tutorial-TUTORIAL.html">TUTORIAL</a></li><li><a href="tutorial-badge-urls.html">badge-urls</a></li><li><a href="tutorial-code-walkthrough.html">code-walkthrough</a></li><li><a href="tutorial-deprecating-badges.html">deprecating-badges</a></li><li><a href="tutorial-input-validation.html">input-validation</a></li><li><a href="tutorial-json-format.html">json-format</a></li><li><a href="tutorial-logos.html">logos</a></li><li><a href="tutorial-performance-testing.html">performance-testing</a></li><li><a href="tutorial-production-hosting.html">production-hosting</a></li><li><a href="tutorial-releases.html">releases</a></li><li><a href="tutorial-rewriting-services.html">rewriting-services</a></li><li><a href="tutorial-self-hosting.html">self-hosting</a></li><li><a href="tutorial-server-secrets.html">server-secrets</a></li><li><a href="tutorial-service-tests.html">service-tests</a></li><li><a href="tutorial-users.html">users</a></li></ul><h3>Global</h3><ul><li><a href="global.html#validateAffiliations">validateAffiliations</a></li></ul>
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