jacobprudhomme / moodle-tinymce_recordrtc

M.tinymce_recordrtc = M.tinymce_recordrtc || {};

// Initialize some variables.

var blobSize = null;

var chunks = null;

var countdownSeconds = null;

var countdownTicker = null;

var maxUploadSize = null;

// Add chunks of audio/video to array when made available.

M.tinymce_recordrtc.handle_data_available = function(event) {

    // Size of all recorded data so far.

    blobSize += event.data.size;

    // Push recording slice to array.

    // If total size of recording so far exceeds max upload limit, stop recording.

    // An extra condition exists to avoid displaying alert twice.

    if ((blobSize >= maxUploadSize) && (!window.localStorage.getItem('alerted'))) {

        window.localStorage.setItem('alerted', 'true');

        Y.use('node-event-simulate', function() {

            startStopBtn.simulate('click');

        });

        M.tinymce_recordrtc.show_alert('nearingmaxsize');

    } else if ((blobSize >= maxUploadSize) && (window.localStorage.getItem('alerted') === 'true')) {

        window.localStorage.removeItem('alerted');

    } else {

        chunks.push(event.data);

    }

};

// Handle recording end.

M.tinymce_recordrtc.handle_stop = function() {

    // Set source of audio player.

    var blob = new window.Blob(chunks, {type: mediaRecorder.mimeType});

    player.set('src', window.URL.createObjectURL(blob));

    // Show audio player with controls enabled, and unmute.

    player.set('muted', false);

    player.set('controls', true);

    player.ancestor().ancestor().removeClass('hide'); // Only audio player is hidden at this point.

    // Show upload button.

    uploadBtn.set('disabled', false);

    uploadBtn.set('textContent', M.util.get_string('attachrecording', 'tinymce_recordrtc'));

    uploadBtn.ancestor().ancestor().removeClass('hide');

    // Handle when upload button is clicked.

    uploadBtn.on('click', function() {

        // Trigger error if no recording has been made.

        if (!player.get('src') || chunks === []) {

            M.tinymce_recordrtc.show_alert('norecordingfound');

        } else {

            uploadBtn.set('disabled', true);

            // Upload recording to server.

            M.tinymce_recordrtc.upload_to_server(recType, function(progress, fileURLOrError) {

                if (progress === 'ended') { // Insert annotation in text.

                    uploadBtn.set('disabled', false);

                    M.tinymce_recordrtc.insert_annotation(recType, fileURLOrError);

                } else if (progress === 'upload-failed') { // Show error message in upload button.

                    uploadBtn.set('disabled', false);

                    uploadBtn.set('textContent', M.util.get_string('uploadfailed', 'tinymce_recordrtc') + ' ' + fileURLOrError);

                } else if (progress === 'upload-failed-404') { // 404 error = File too large in Moodle.

                    uploadBtn.set('disabled', false);

                    uploadBtn.set('textContent', M.util.get_string('uploadfailed404', 'tinymce_recordrtc'));

                } else if (progress === 'upload-aborted') {

                    uploadBtn.set('disabled', false);

                    uploadBtn.set('textContent', M.util.get_string('uploadaborted', 'tinymce_recordrtc') + ' ' + fileURLOrError);

                } else {

                    uploadBtn.set('textContent', progress);

                }

            });

        }

    });

};

// Get everything set up to start recording.

M.tinymce_recordrtc.start_recording = function(type, stream) {

    // If none of the mime-types are supported, fall back on browser defaults.

    var options = M.tinymce_recordrtc.best_rec_options(type);

    mediaRecorder = new window.MediaRecorder(stream, options);

    // Initialize MediaRecorder events and start recording.

    mediaRecorder.ondataavailable = M.tinymce_recordrtc.handle_data_available;

    mediaRecorder.onstop = M.tinymce_recordrtc.handle_stop;

    mediaRecorder.start(1000); // Capture in 1s chunks. Must be set to work with Firefox.

    // Mute audio, distracting while recording.

    player.set('muted', true);

    // Set recording timer to the time specified in the settings.

    countdownSeconds = window.params.timelimit;

    countdownSeconds++;

    var timerText = M.util.get_string('stoprecording', 'tinymce_recordrtc');

    timerText += ' (<span id="minutes"></span>:<span id="seconds"></span>)';

    startStopBtn.setHTML(timerText);

    M.tinymce_recordrtc.set_time();

    countdownTicker = window.setInterval(M.tinymce_recordrtc.set_time, 1000);

    // Make button clickable again, to allow stopping recording.

    startStopBtn.set('disabled', false);

};

// Upload recorded audio/video to server.

M.tinymce_recordrtc.upload_to_server = function(type, callback) {

    var xhr = new window.XMLHttpRequest();

    // Get src media of audio/video tag.

    xhr.open('GET', player.get('src'), true);

    xhr.responseType = 'blob';

    xhr.onload = function() {

        if (xhr.status === 200) { // If src media was successfully retrieved.

            // blob is now the media that the audio/video tag's src pointed to.

            var blob = this.response;

            // Generate filename with random ID and file extension.

            var fileName = (Math.random() * 1000).toString().replace('.', '');

            if (type === 'audio') {

                fileName += '-audio.ogg';

            } else {

                fileName += '-video.webm';

            }

            // Create FormData to send to PHP upload/save script.

            var formData = new window.FormData();

            formData.append('contextid', window.params.contextid);

            formData.append('sesskey', window.params.sesskey);

            formData.append(type + '-filename', fileName);

            formData.append(type + '-blob', blob);

            // Pass FormData to PHP script using XHR.

            M.tinymce_recordrtc.make_xmlhttprequest('save.php', formData, function(progress, responseText) {

                if (progress === 'upload-ended') {

                    var initialURL = location.href.replace(location.href.split('/').pop(), '') + 'uploads.php/';

                    callback('ended', initialURL + responseText);

                } else {

                    callback(progress);

                }

            });

        }

    };

    xhr.send();

};

// Handle XHR sending/receiving/status.

M.tinymce_recordrtc.make_xmlhttprequest = function(url, data, callback) {

    var xhr = new window.XMLHttpRequest();

    xhr.onreadystatechange = function() {

        if ((xhr.readyState === 4) && (xhr.status === 200)) { // When request is finished and successful.

            callback('upload-ended', xhr.responseText);

        } else if (xhr.status === 404) { // When request returns 404 Not Found.

            callback('upload-failed-404');

        }

    };

    xhr.upload.onprogress = function(event) {

        callback(Math.round(event.loaded / event.total * 100) + "% " + M.util.get_string('uploadprogress', 'tinymce_recordrtc'));

    };

    xhr.upload.onerror = function(error) {

        callback('upload-failed', error);

    };

    xhr.upload.onabort = function(error) {

        callback('upload-aborted', error);

    };

    // POST FormData to PHP script that handles uploading/saving.

    xhr.open('POST', url);

    xhr.send(data);

};

// Makes 1min and 2s display as 1:02 on timer instead of 1:2, for example.

M.tinymce_recordrtc.pad = function(val) {

    var valString = val + "";

    if (valString.length < 2) {

        return "0" + valString;

    } else {

        return valString;

    }

};

// Functionality to make recording timer count down.

// Also makes recording stop when time limit is hit.

M.tinymce_recordrtc.set_time = function() {

    countdownSeconds--;

    startStopBtn.one('span#seconds').set('textContent', M.tinymce_recordrtc.pad(countdownSeconds % 60));

    startStopBtn.one('span#minutes').set('textContent', M.tinymce_recordrtc.pad(window.parseInt(countdownSeconds / 60, 10)));

    if (countdownSeconds === 0) {

        Y.use('node-event-simulate', function() {

            startStopBtn.simulate('click');

        });

    }

};