Stanza.io private storage plugin example

JSONPrivateStorage.js

/**
 * Stanza.io plugin that allows storing private JSON data in private storage on
 * the XMPP server (XEP-0049).
 *
 * Example usage:
 *
 * ```
 * var docs = {doc1: 'some value', doc2: {some: 'value'}, doc3: ['some', 'value']};
 * client.setPrivateDocuments(docs, cb);
 * client.getPrivateDocuments(cb);
 * ```
 */
import { Namespace as NS } from 'xmpp-constants';
import get from 'lodash/get';
import forOwn from 'lodash/forOwn';

module.exports = function (client, stanzas) {

  // 1. Create and register our custom stanza type:
  // <documents>
  //   <document key="doc1">JSON encoded value</document>
  //   <document key="doc2">JSON encoded value</document>
  // </documents>
  var types = stanzas.utils;

  var JsonDocument = stanzas.define({
    name: '_document',
    element: 'document',
    namespace: 'stanza:io:json',
    fields: {
      key: types.attribute('key'),
      value: types.text()
    }
  });

  let JsonDocuments = stanzas.define({
    name: 'documents',
    namespace: 'stanza:io:json',
    element: 'documents'
  });


  stanzas.extend(JsonDocuments, JsonDocument, 'list');

  stanzas.withDefinition('query', NS.PRIVATE, function (PrivateStorage) {
    stanzas.extend(PrivateStorage, JsonDocuments);
  });

  /**
   * Query the privateStorage of JSON documents.
   * Return an object with a key for each document value: {key: value}.
   */
  client.getPrivateDocuments = function (cb) {
    this.getPrivateData({documents: true}, (err, res) => {
      if (err) {
        return cb(err);
      }

      const rawDocs = get(res, 'privateStorage.documents.list') || [];
      const docs = {};

      rawDocs.forEach((rawDoc) => {
        docs[rawDoc.key] = JSON.parse(rawDoc.value);
      });

      cb(null, docs);
    });
  };

  /**
   * Docs is a Map of key: value.
   * This function will do all the necessary XML/JSON encoding.
   */
  client.setPrivateDocuments = function (docs, cb) {
    const encodedDocs = [];
    forOwn(docs, (value, key) => {
      encodedDocs.push({
        key: key,
        value: JSON.stringify(value)
      });
    });

    this.setPrivateData({documents: {list: encodedDocs}}, cb);
  };

};

Hey! What is stanzas.withDefinition here and stanzas.extend?

this is super old, dont quite remember.

It should be Stanza.io API functions. See stanza.io API. Its been 3 years, I'm not using it anymore.