jacobprudhomme / moodle-atto_recordrtc

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

// Shorten access to M.atto_recordrtc.commonmodule namespace.

var cm = M.atto_recordrtc.commonmodule,

    am = M.atto_recordrtc.abstractmodule;

M.atto_recordrtc.commonmodule = {

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

    editorScope: null,

    alertWarning: null,

    alertDanger: null,

    player: null,

    playerDOM: null, // Used to manipulate DOM directly.

    startStopBtn: null,

    uploadBtn: null,

    countdownSeconds: null,

    countdownTicker: null,

    recType: null,

    stream: null,

    mediaRecorder: null,

    chunks: null,

    blobSize: null,

    olderMoodle: null,

    maxUploadSize: null,

    // Capture webcam/microphone stream.

    capture_user_media: function(mediaConstraints, successCallback, errorCallback) {

        window.navigator.mediaDevices.getUserMedia(mediaConstraints).then(successCallback).catch(errorCallback);

    },

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

    handle_data_available: function(event) {

        // Push recording slice to array.

        cm.chunks.push(event.data);

        // Size of all recorded data so far.

        cm.blobSize += event.data.size;

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

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

            if (!window.localStorage.getItem('alerted')) {

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

                cm.startStopBtn.simulate('click');

                am.show_alert('nearingmaxsize');

            } else {

                window.localStorage.removeItem('alerted');

            }

            cm.chunks.pop();

        }

    },

    // Handle recording end.

    handle_stop: function() {

        // Set source of audio player.

        var blob = new window.Blob(cm.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');

        // Show upload button.

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

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

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

        // Handle when upload button is clicked.

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

            // Trigger error if no recording has been made.

            if (cm.chunks.length === 0) {

                am.show_alert('norecordingfound');

            } else {

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

                // Upload recording to server.

                cm.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) {

        // The options for the recording codecs and bitrates.

        var options = am.select_rec_options(type);

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

        // Initialize MediaRecorder events and start recording.

        cm.mediaRecorder.ondataavailable = cm.handle_data_available;

        cm.mediaRecorder.onstop = cm.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.

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

        cm.countdownSeconds++;

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

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

        cm.startStopBtn.setHTML(timerText);

        cm.set_time();

        cm.countdownTicker = window.setInterval(cm.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('.', '');

                fileName += (type === 'audio') ? '-audio.ogg'

                                               : '-video.webm';

                // Create FormData to send to PHP filepicker-upload script.

                var formData = new window.FormData(),

                    filepickerOptions = cm.editorScope.get('host').get('filepickeroptions').link,

                    repositoryKeys = window.Object.keys(filepickerOptions.repositories);

                formData.append('repo_upload_file', blob, fileName);

                formData.append('itemid', filepickerOptions.itemid);

                for (var i = 0; i < repositoryKeys.length; i++) {

                    if (filepickerOptions.repositories[repositoryKeys[i]].type === 'upload') {

                        formData.append('repo_id', filepickerOptions.repositories[repositoryKeys[i]].id);

                        break;

                    }

                }

                formData.append('env', filepickerOptions.env);

                formData.append('sesskey', M.cfg.sesskey);

                formData.append('client_id', filepickerOptions.client_id);

                formData.append('savepath', '/');

                formData.append('ctx_id', filepickerOptions.context.id);

                // Pass FormData to PHP script using XHR.

                var uploadEndpoint = M.cfg.wwwroot + '/repository/repository_ajax.php?action=upload';

                cm.make_xmlhttprequest(uploadEndpoint, formData,

                    function(progress, responseText) {

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

                            callback('ended', window.JSON.parse(responseText).url);

                        } else {

                            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() {

        cm.countdownSeconds--;

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

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

        if (cm.countdownSeconds === 0) {

            cm.startStopBtn.simulate('click');

        }

    },

    // Generates link to recorded annotation to be inserted.

    create_annotation: function(type, recording_url) {

        var linkText = window.prompt(M.util.get_string('annotationprompt', 'atto_recordrtc'),

                                     M.util.get_string('annotation:' + type, 'atto_recordrtc'));

        // Return HTML for annotation link, if user did not press "Cancel".

        if (!linkText) {

            return undefined;

        } else {

            var annotation = '<a target="_blank" href="' + recording_url + '">' + linkText + '</a>';

            return annotation;

        }

    },

    // Inserts link to annotation in editor text area.

    insert_annotation: function(type, recording_url) {

        var annotation = cm.create_annotation(type, recording_url);

        // Insert annotation link.

        // If user pressed "Cancel", just go back to main recording screen.

        if (!annotation) {

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

        } else {

            cm.editorScope.setLink(cm.editorScope, annotation);

        }

    }

};