jacobprudhomme / moodle-atto_recordrtc

M.atto_recordrtc = M.atto_recordrtc || {};

// Shorten access to module namespaces.

var cm = M.atto_recordrtc.commonmodule,

    hm = M.atto_recordrtc.helpermodule;

M.atto_recordrtc.helpermodule = {

    // Unitialized variables to be used by the other modules.

    blobSize: null,

    chunks: null,

    countdownSeconds: null,

    countdownTicker: null,

    maxUploadSize: null,

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

    handle_data_available: function(event) {

        // Size of all recorded data so far.

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

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

            cm.startStopBtn.simulate('click');

            cm.show_alert('nearingmaxsize');

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

            window.localStorage.removeItem('alerted');

        } else {

            hm.chunks.push(event.data);

        }

    },

    // Handle recording end.

    handle_stop: function() {

        // Set source of audio player.

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

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

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

        cm.player.set('muted', false);

        cm.player.set('controls', true);

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

        // Show upload button.

        cm.uploadBtn.set('disabled', false);

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

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

        // Handle when upload button is clicked.

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

            // Trigger error if no recording has been made.

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

                cm.show_alert('norecordingfound');

            } else {

                cm.uploadBtn.set('disabled', true);

                // Upload recording to server.

                hm.upload_to_server(cm.recType, function(progress, fileURLOrError) {

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

                        cm.uploadBtn.set('disabled', false);

                        cm.insert_annotation(cm.recType, fileURLOrError);

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

                        cm.uploadBtn.set('disabled', false);

                        cm.uploadBtn.set('textContent',

                            M.util.get_string('uploadfailed', 'atto_recordrtc') + ' ' + fileURLOrError);

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

                        cm.uploadBtn.set('disabled', false);

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

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

                        cm.uploadBtn.set('disabled', false);

                        cm.uploadBtn.set('textContent',

                            M.util.get_string('uploadaborted', 'atto_recordrtc') + ' ' + fileURLOrError);

                    } else {

                        cm.uploadBtn.set('textContent', progress);

                    }

                });

            }

        });

    },

    // Get everything set up to start recording.

    start_recording: function(type, stream) {

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

        var options = cm.best_rec_options(type);

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

        // Initialize MediaRecorder events and start recording.

        cm.mediaRecorder.ondataavailable = hm.handle_data_available;

        cm.mediaRecorder.onstop = hm.handle_stop;

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

        // Mute audio, distracting while recording.

        cm.player.set('muted', true);

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

        hm.countdownSeconds = cm.editorScope.get('timelimit');

        hm.countdownSeconds++;

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

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

        cm.startStopBtn.setHTML(timerText);

        hm.set_time();

        hm.countdownTicker = window.setInterval(hm.set_time, 1000);

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

        cm.startStopBtn.set('disabled', false);

    },

    // Upload recorded audio/video to server.

    upload_to_server: function(type, callback) {

        var xhr = new window.XMLHttpRequest();

        // Get src media of audio/video tag.

        xhr.open('GET', cm.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', cm.editorScope.get('contextid'));

                formData.append('sesskey', cm.editorScope.get('sesskey'));

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

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

                // Pass FormData to PHP script using XHR.

                hm.make_xmlhttprequest(cm.editorScope.get('recordrtcroot') + 'save.php', formData,

                    function(progress, responseText) {

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

                            var initialURL = cm.editorScope.get('recordrtcroot') + 'uploads.php/';

                            return callback('ended', initialURL + responseText);

                        }

                        return callback(progress);

                    }

                );

            }

        };

        xhr.send();

    },

    // Handle XHR sending/receiving/status.

    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', 'atto_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.

    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.

    set_time: function() {

        hm.countdownSeconds--;

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

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

        if (hm.countdownSeconds === 0) {

            cm.startStopBtn.simulate('click');

        }

    }

};