blindsidenetworks / moodle-tinymce_recordrtc

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

// Extract plugin settings to params hash.

(function() {

    var params = {};

    var r = /([^&=]+)=?([^&]*)/g;

    var d = function(s) {

        return window.decodeURIComponent(s.replace(/\+/g, ' '));

    };

    var search = window.location.search;

    var match = r.exec(search.substring(1));

    while (match) {

        params[d(match[1])] = d(match[2]);

        if (d(match[2]) === 'true' || d(match[2]) === 'false') {

            params[d(match[1])] = d(match[2]) === 'true' ? true : false;

        }

        match = r.exec(search.substring(1));

    }

    window.params = params;

})();

// Initialize some variables.

var alertWarning = null;

var alertDanger = null;

var blobSize = null;

var chunks = null;

var countdownSeconds = null;

var countdownTicker = null;

var maxUploadSize = null;

var mediaRecorder = null;

var player = null;

var playerDOM = null;

var recType = null;

var startStopBtn = null;

var uploadBtn = null;

// Capture webcam/microphone stream.

M.tinymce_recordrtc.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.

M.tinymce_recordrtc.handle_data_available = function(event) {

    // Push recording slice to array.

    chunks.push(event.data);

    // Size of all recorded data so far.

    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 (blobSize >= maxUploadSize) {

        if (!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 {

            window.localStorage.removeItem('alerted');

        }

        chunks.pop();

    }

};

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');

    // Show upload button.

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

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

    uploadBtn.set('disabled', false);

    // Handle when upload button is clicked.

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

        // Trigger error if no recording has been made.

        if (chunks.length === 0) {

            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) {

    // The options for the recording codecs and bitrates.

    var options = M.tinymce_recordrtc.select_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('.', '');

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

                                           : '-video.webm';

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

            var formData = new window.FormData(),

                editorId = tinyMCE.activeEditor.id,

                filepickerOptions = parent.M.editor_tinymce.filepicker_options[editorId].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';

            M.tinymce_recordrtc.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.

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');

        });

    }

};

// Generates link to recorded annotation to be inserted.

M.tinymce_recordrtc.create_annotation = function(type, recording_url) {

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

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

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

    if (!linkText) {

        return undefined;

    } else {

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

        return annotation;

    }

};

// Inserts link to annotation in editor text area.

M.tinymce_recordrtc.insert_annotation = function(type, recording_url) {

    var annotation = M.tinymce_recordrtc.create_annotation(type, recording_url);

    // Insert annotation link.

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

    if (!annotation) {

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

    } else {

        tinyMCEPopup.editor.execCommand('mceInsertContent', false, annotation);

        tinyMCEPopup.close();

    }

};