- Qt 5.15
- Qt Quick Demo - Tweet Search
- Qt 5.15.12 Reference Documentation

# Qt Quick Demo - Tweet Search

     /****************************************************************************
     **
     ** Copyright (C) 2017 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and The Qt Company. For licensing terms
     ** and conditions see https://www.qt.io/terms-conditions. For further
     ** information use the contact form at https://www.qt.io/contact-us.
     **
     ** BSD License Usage
     ** Alternatively, you may use this file under the terms of the BSD license
     ** as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     import QtQuick 2.0
     import "tweetsearch.mjs" as Helper

     Item {
         id: wrapper

         // Insert valid consumer key and secret tokens below
         // See https://dev.twitter.com/apps
         property string consumerKey : ""
         property string consumerSecret : ""
         property string bearerToken : ""

         property variant model: tweets
         property string from : ""
         property string phrase : ""

         signal isLoaded

         ListModel { id: tweets }

         function encodePhrase(x) { return encodeURIComponent(x); }

         function reload() {
             tweets.clear()

             if (from == "" && phrase == "")
                 return;

             var req = new XMLHttpRequest;
             req.open("GET", "https://api.twitter.com/1.1/search/tweets.json?from=" + from +
                             "&count=10&q=" + encodePhrase(phrase));
             req.setRequestHeader("Authorization", "Bearer " + bearerToken);
             req.onload = function() {
                 var objectArray = JSON.parse(req.responseText);
                 if (objectArray.errors !== undefined) {
                     console.log("Error fetching tweets: " + objectArray.errors[0].message)
                 } else {
                     for (var key in objectArray.statuses) {
                         var jsonObject = objectArray.statuses[key];
                         tweets.append(jsonObject);
                     }
                 }
                 wrapper.isLoaded()
             }
             req.send();
         }

         onPhraseChanged: reload();
         onFromChanged: reload();

         Component.onCompleted: {
             if (consumerKey === "" || consumerSecret == "") {
                 bearerToken = encodeURIComponent(Helper.demoToken())
                 return;
             }

             var authReq = new XMLHttpRequest;
             authReq.open("POST", "https://api.twitter.com/oauth2/token");
             authReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
             authReq.setRequestHeader("Authorization", "Basic " + Qt.btoa(consumerKey + ":" + consumerSecret));
             authReq.onreadystatechange = function() {
                 if (authReq.readyState === XMLHttpRequest.DONE) {
                     var jsonResponse = JSON.parse(authReq.responseText);
                     if (jsonResponse.errors !== undefined)
                         console.log("Authentication error: " + jsonResponse.errors[0].message)
                     else
                         bearerToken = jsonResponse.access_token;
                 }
             }
             authReq.send("grant_type=client_credentials");
         }

     }