blindsidenetworks / moodle-atto_recordrtc

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

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

var cm = M.atto_recordrtc.commonmodule;

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,

    // A helper for making a Moodle alert appear.

    // Subject is the content of the alert (which error ther alert is for).

    // Possibility to add on-alert-close event.

    show_alert: function(subject, onCloseEvent) {

        Y.use('moodle-core-notification-alert', function() {

            var dialogue = new M.core.alert({

                title: M.util.get_string(subject + '_title', 'atto_recordrtc'),

                message: M.util.get_string(subject, 'atto_recordrtc')

            });

            if (onCloseEvent) {

                dialogue.after('complete', onCloseEvent);

            }

        });

    },

    // Handle getUserMedia errors.

    handle_gum_errors: function(error, commonConfig) {

        var btnLabel = M.util.get_string('recordingfailed', 'atto_recordrtc'),

            treatAsStopped = function() {

                commonConfig.onMediaStopped(btnLabel);

            };

        // Changes 'CertainError' -> 'gumcertain' to match language string names.

        var stringName = 'gum' + error.name.replace('Error', '').toLowerCase();

        // After alert, proceed to treat as stopped recording, or close dialogue.

        if (stringName !== 'gumsecurity') {

            cm.show_alert(stringName, treatAsStopped);

        } else {

            cm.show_alert(stringName, function() {

                cm.editorScope.closeDialogue(cm.editorScope);

            });

        }

    },

    // Show alert and close plugin if browser does not support WebRTC at all.

    check_has_gum: function() {

            cm.show_alert('nowebrtc', function() {

                cm.editorScope.closeDialogue(cm.editorScope);

            });

        }

    },

    // Notify and redirect user if plugin is used from insecure location.

    check_secure: function() {

        var isSecureOrigin = (window.location.protocol === 'https:') ||

                             (window.location.host.indexOf('localhost') !== -1);

        if (!isSecureOrigin && (window.bowser.chrome || window.bowser.opera)) {

            cm.show_alert('gumsecurity', function() {

                cm.editorScope.closeDialogue(cm.editorScope);

            });

        } else if (!isSecureOrigin) {

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

        }

    },

    // Display "consider switching browsers" message if not using:

    // - Firefox 29+;

    // - Chrome 49+;

    // - Opera 36+.

    check_browser: function() {

        if (!((window.bowser.firefox && window.bowser.version >= 29) ||

              (window.bowser.chrome && window.bowser.version >= 49) ||

              (window.bowser.opera && window.bowser.version >= 36))) {

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

        }

    },

    // Capture webcam/microphone stream.

    capture_user_media: function(mediaConstraints, successCallback, errorCallback) {

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

    },

    // Select best options for the recording codec.

    select_rec_options: function(recType) {

        var types, options;

        if (recType === 'audio') {

                    'audio/webm;codecs=opus',

                    'audio/ogg;codecs=opus'

                ],

                    audioBitsPerSecond: window.parseInt(cm.editorScope.get('audiobitrate'))

                };

        } else {

                    'video/webm;codecs=vp9,opus',

                    'video/webm;codecs=h264,opus',

                    'video/webm;codecs=vp8,opus'

                ],

                    audioBitsPerSecond: window.parseInt(cm.editorScope.get('audiobitrate')),

                    videoBitsPerSecond: window.parseInt(cm.editorScope.get('videobitrate'))

                };

        }

        var compatTypes = types.filter(function(type) {

            return window.MediaRecorder.isTypeSupported(type);

        });

        if (compatTypes.length !== 0) {

            options.mimeType = compatTypes[0];

        }

        return options;

    },

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

    handle_data_available: function(event) {

        // Size of all recorded data so far.

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

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

            cm.startStopBtn.simulate('click');

            cm.show_alert('nearingmaxsize');

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

            window.localStorage.removeItem('alerted');

        } else {

            cm.chunks.push(event.data);

        }

    },

    // 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.player.get('src') || cm.chunks === []) {

                cm.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 = cm.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('.', '');

                if (type === 'audio') {

                    fileName += '-audio.ogg';

                } else {

                    fileName += '-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);

        }

    }

};