@contentacms/contentajs/lib/helpers/ContentaJsonRpc.js

A nodejs server that proxies to Contenta CMS and holds custom code.

"use strict";

const _ = require('lodash');

const got = require('./got');
/**
 * A class for a JSON RPC executor.
 */


class ContentaJsonRpc {
  /**
   * The location of the CMS with auto-dicovery.
   */

  /**
   * The list of methods available in the Contenta CMS side.
   */

  /**
   * Constructs a ContentaJsonRpc object.
   *
   * @param {string} cmsHost
   *   The location of the CMS with auto-dicovery.
   */
  constructor(cmsHost) {
    this.host = cmsHost;
  }
  /**
   * Reads from the discovery endpoint and attaches the methods to the object.
   *
   * @return {Promise<void>}
   *   Resolves when initialized.
   */


  init() {
    return got(`${this.host}/jsonrpc/methods`).then(res => {
      const body = _.get(res, 'body');

      this.methods = body.data.map(method => method.id).filter(i => i);
    }).then(() => {});
  }
  /**
   * Executes the provided JSON RPC request against Contenta CMS.
   *
   * @param {JsonRpcRequest} request
   *   The request object according to the spec.
   *
   * @return {Promise<JsonRpcResponse>}
   *   The response from the Contenta CMS JSON-RPC server.
   */


  execute(request) {
    // TODO: We probably want to validate input here with a JSON Schema.
    if (!Array.isArray(request) && this.methods.indexOf(request.method) === -1) {
      return Promise.reject(new Error(JSON.stringify({
        jsonrpc: '2.0',
        error: {
          code: -32601,
          message: 'Method not found'
        }
      })));
    }

    return got(`${this.host}/jsonrpc`, {
      query: {
        query: JSON.stringify(request)
      }
    }) // Reject if the request errored and is not a batched request.
    .then(res => {
      const body = _.get(res, 'body');

      const isError = body && typeof _.get(body, 'error') !== 'undefined';
      return isError ? Promise.reject(new Error(JSON.stringify(body))) : Promise.resolve(body);
    });
  }

}

module.exports = ContentaJsonRpc;