friendica-github/view/js/linkPreview.js

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/**
* Copyright (c) 2014 Leonardo Cardoso (http://leocardz.com)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
*
* Restructured by Rabzuarus (https://friendica.kommune4.de/profile/rabuzarus)
* to use it in the decentralized social network Friendica (https://friendi.ca).
*
* Version: 1.4.0
*/
(function ($) {
$.fn.linkPreview = function (options) {
var opts = jQuery.extend({}, $.fn.linkPreview.defaults, options);
var selector = $(this).selector;
selector = selector.substr(1);
var previewTpl = '\
<div id="preview_' + selector + '" class="preview {0}">\
{1}\
<input type="hidden" name="has_attachment" id="hasAttachment_' + selector + '" value="{2}" />\
<input type="hidden" name="attachment_url" id="attachmentUrl_' + selector + '" value="{3}" />\
<input type="hidden" name="attachment_type" id="attachmentType_' + selector + '" value="{4}" />\
</div>';
var attachmentTpl = '\
<hr class="previewseparator">\
<div id="closePreview_' + selector + '" title="Remove" class="closePreview" >\
<button type="button" class="previewActionBtn">×</button>\
</div>\
<div id="previewImages_' + selector + '" class="previewImages">\
<div id="previewImgBtn_' + selector + '" class="previewImgBtn">\
<button type="button" id="previewChangeImg_' + selector + '" class="buttonChangeDeactive previewActionBtn" style="display: none">\
<i class="fa fa-exchange" aria-hidden="true"></i>\
</button>\
</div>\
<div id="previewImage_' + selector + '" class="previewImage">\
</div>\
<input type="hidden" id="photoNumber_' + selector + '" class="photoNumber" value="0" />\
<input type="hidden" name="attachment_img_src" id="attachmentImageSrc_' + selector + '" value="" />\
<input type="hidden" name="attachment_img_width" id="attachmentImageWidth_' + selector + '" value="0" />\
<input type="hidden" name="attachment_img_height" id="attachmentImageHeight_' + selector + '" value="0" />\
</div>\
<div id="previewContent_' + selector + '" class="previewContent">\
<h4 id="previewTitle_' + selector + '" class="previewTitle"></h4>\
<blockquote id="previewDescription_' + selector + '" class="previewDescription"></blockquote>\
<div id="hiddenDescription_' + selector + '" class="hiddenDescription"></div>\
<sup id="previewUrl_' + selector + '" class="previewUrl"></sup>\
</div>\
<div class="clear"></div>\
<hr class="previewseparator">';
var text;
var urlRegex = /(https?\:\/\/|\s)[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})(\/+[a-z0-9_.\:\;-]*)*(\?[\&\%\|\+a-z0-9_=,\.\:\;-]*)?([\&\%\|\+&a-z0-9_=,\:\;\.-]*)([\!\#\/\&\%\|\+a-z0-9_=,\:\;\.-]*)}*/i;
var binurl;
var block = false;
var blockTitle = false;
var blockDescription = false;
var cache = {};
var images = "";
var isExtern = false;
var photoNumber = 0;
var firstPosted = false;
var isActive = false;
var isCrawling = false;
var defaultTitle = opts.defaultTitle;
var defaultDescription = opts.defaultDescription;
/**
* Initialize the plugin
*
* @returns {void}
*/
var init = function() {
$('#' + selector).bind({
paste: function () {
setTimeout(function () {
crawlText();
}, 100);
},
keyup: function (e) {
// on enter, space, ctrl
if ((e.which === 13 || e.which === 32 || e.which === 17)) {
crawlText();
}
}
});
// Check if we have already attachment bbcode in the textarea
// and add it to the attachment preview.
var content = $('#' + selector).val();
addBBCodeToPreview(content);
};
/**
* Reset some values.
*
* @returns {void}
*/
var resetPreview = function() {
$('#hasAttachment_' + selector).val(0);
photoNumber = 0;
images = "";
};
/**
* Crawl a text string if it contains an url and try
* to attach it.
*
* If no text is passed to crawlText() we take
* the previous word before the cursor of the textarea.
*
* @param {string} text (optional)
* @returns {void}
*/
var crawlText = function (text) {
block = false;
images = '';
isExtern = false;
// If no text is passed to crawlText() we
// take the previous word before the cursor.
if (typeof text === 'undefined') {
text = getPrevWord(selector);
} else {
isExtern = true;
}
// Don't procces the textarea input if we have already
// an attachment preview.
if (!isExtern && isActive) {
return;
}
if (trim(text) !== "") {
if (block === false && urlRegex.test(text)) {
binurl = bin2hex(text);
block = true;
isCrawling = true;
$('#profile-rotator').show();
if (binurl in cache) {
isCrawling = false;
processContentData(cache[binurl]);
} else {
getContentData(binurl, processContentData);
}
}
}
};
/**
* Process the attachment data according to
* its content type (image, audio, video, attachment)
*
* @param {object} result
* @returns {void}
*/
var processContentData = function(result) {
if (result.contentType === 'image') {
insertImage(result.data);
}
if (result.contentType === 'audio') {
insertAudio(result.data);
}
if (result.contentType === 'video') {
insertVideo(result.data);
}
if (result.contentType === 'attachment') {
insertAttachment(result.data);
}
$('#profile-rotator').hide();
};
/**
* Fetch the content of link which should be attached.
*
* @param {string} binurl Link which should be attached as hexadecimal string.
* @param {type} callback
* @returns {void}
*/
var getContentData = function(binurl, callback) {
$.get('parse_url?binurl='+ binurl + '&format=json', function (answer) {
obj = sanitizeInputData(answer);
// Put the data into a cache
cache[binurl] = obj;
callback(obj);
isCrawling = false;
});
};
/*
* Add a [img] bbtag with the image url to the jot editor.
*
* @param {type} data
* @returns {void}
*/
var insertImage = function(data) {
if (!isExtern) {
return;
}
var bbcode = '\n[img]' + data.url + '[/img]\n';
addeditortext(bbcode);
};
/*
* Add a [audio] bbtag with the audio url to the jot editor.
*
* @param {type} data
* @returns {void}
*/
var insertAudio = function(data) {
if (!isExtern) {
return;
}
var bbcode = '\n[audio]' + data.url + '[/audio]\n';
addeditortext(bbcode);
};
/*
* Add a [video] bbtag with the video url to the jot editor.
*
* @param {type} data
* @returns {void}
*/
var insertVideo = function(data) {
if (!isExtern) {
return;
}
var bbcode = '\n[video]' + json.url + '[/video]\n';
addeditortext(bbcode);
};
/**
* Proccess all attachment data and show up a html
* attachment preview.
*
* @param {obj} data Attachment data.
* @returns {void}
*/
var insertAttachment = function(data) {
// If we have already a preview, leaver here.
// Note: if we finish the Preview of other media content type,
// we can move this condition to the beggining of crawlText();
if (isActive) {
$('#profile-rotator').hide();
return;
}
if (data.type !== 'link' && data.type !== 'video' && data.type !== 'photo' || data.url === data.title) {
$('#profile-rotator').hide();
return;
}
$('#photoNumber_' + selector).val(0);
resetPreview();
processAttachmentTpl(data, 'type-' + data.type);
addTitleDescription(data);
addHostToAttachment(data.url);
addImagesToAttachment(data.images);
processEventListener();
$('#profile-rotator').hide();
};
/**
* Construct the attachment html from the attachment template and
* add it to the DOM.
*
* @param {object} data Attachment data.
* @returns {void}
*/
var processAttachmentTpl = function(data) {
// Load and add the template if it isn't allready loaded.
if ($('#preview_' + selector).length === 0) {
var tpl = previewTpl.format(
'type-' + data.type,
attachmentTpl,
1,
bin2hex(data.url),
data.type
);
$('#' + selector).after(tpl);
}
isActive = true;
};
/**
* Add the attachment title and the description
* to the attachment preview.
*
* @param {object} data Attachment data.
* @returns {void}
*/
var addTitleDescription = function(data) {
var description = data.text;
if (description === '') {
description = defaultDescription;
}
$('#previewTitle_' + selector).html("\
<span id='previewSpanTitle_" + selector + "' class='previewSpanTitle' >" + escapeHTML(data.title) + "</span>\
<input type='text' name='attachment_title' value='" + escapeHTML(data.title) + "' id='previewInputTitle_" + selector + "' class='previewInputTitle inputPreview' style='display: none;'/>"
);
$('#previewDescription_' + selector).html("\
<span id='previewSpanDescription_" + selector + "' class='previewSpanDescription' >" + escapeHTML(description) + "</span>\n\
<textarea id='previewInputDescription_" + selector + "' name='attachment_text' class='previewInputDescription' style='display: none;' class='inputPreview' >" + escapeHTML(data.text) + "</textarea>"
);
};
/**
* Add the host to the attachment preview.
*
* @param {string} url The url of the link attachment.
* @returns {void}
*/
var addHostToAttachment = function(url) {
if (url) {
var regexpr = "(https?://)([^:^/]*)(:\\d*)?(.*)?";
var regResult = url.match(regexpr);
var urlHost = regResult[1] + regResult[2];
$('#previewUrl_' + selector).html("<a href='" + url + "'>" + urlHost + "</a>");
}
};
/**
* Add preview images to the attachment.
*
* @param {array} images
*
* @returns {void}
*/
var addImagesToAttachment = function(images) {
var imageClass = 'attachment-preview';
if (Array.isArray(images)) {
$('#previewImages_' + selector).show();
$('#attachmentImageSrc_' + selector).val(bin2hex(images[photoNumber].src));
$('#attachmentImageWidth_' + selector).val(images[photoNumber].width);
$('#attachmentImageHeight_' + selector).val(images[photoNumber].height);
} else {
$('#previewImages_' + selector).hide();
}
images.length = parseInt(images.length);
var appendImage = "";
for (i = 0; i < images.length; i++) {
// For small preview images we use a smaller attachment format.
///@todo here we need to add a check for !Config::get('system', 'always_show_preview').
if (images[i].width >= 500 && images[i].width >= images[i].height) {
imageClass = 'attachment-image';
}
if (i === 0) {
appendImage += "<img id='imagePreview_" + selector + "_" + i + "' src='" + images[i].src + "' class='" + imageClass + "' ></img>";
} else {
appendImage += "<img id='imagePreview_" + selector + "_" + i + "' src='" + images[i].src + "' class='" + imageClass + "' style='display: none;'></img>";
}
}
$('#previewImage_' + selector).html(appendImage + "<div id='whiteImage' style='color: transparent; display:none;'>...</div>");
// More than just one image.
if (images.length > 1) {
// Enable the the button to change the preview pictures.
$('#previewChangeImg_' + selector).show();
if (firstPosted === false) {
firstPosted = true;
$('#previewChangeImg_' + selector).unbind('click').click(function (e) {
e.stopPropagation();
if (images.length > 1) {
$('#imagePreview_' + selector + '_' + photoNumber).css({
'display': 'none'
});
photoNumber += 1;
// If have reached the last image, begin with the first image.
if (photoNumber === images.length) {
photoNumber = 0;
}
$('#imagePreview_' + selector + '_' + photoNumber).css({
'display': 'block'
});
$('#photoNumber_' + selector).val(photoNumber);
$('#attachmentImageSrc_' + selector).val(bin2hex(images[photoNumber].src));
$('#attachmentImageWidth_' + selector).val(images[photoNumber].width);
$('#attachmentImageHeight_' + selector).val(images[photoNumber].height);
}
});
}
}
};
/**
* Add event listener to control the attachment preview.
*
* @returns {void}
*/
var processEventListener = function() {
$('#previewSpanTitle_' + selector).unbind('click').click(function (e) {
e.stopPropagation();
if (blockTitle === false) {
blockTitle = true;
$('#previewSpanTitle_' + selector).hide();
$('#previewInputTitle_' + selector).show();
$('#previewInputTitle_' + selector).val($('#previewInputTitle_' + selector).val());
$('#previewInputTitle_' + selector).focus().select();
}
});
$('#previewInputTitle_' + selector).blur(function () {
blockTitle = false;
$('#previewSpanTitle_' + selector).html($('#previewInputTitle_' + selector).val());
$('#previewSpanTitle_' + selector).show();
$('#previewInputTitle_' + selector).hide();
});
$('#previewInputTitle_' + selector).keypress(function (e) {
if (e.which === 13) {
blockTitle = false;
$('#previewSpanTitle_' + selector).html($('#previewInputTitle_' + selector).val());
$('#previewSpanTitle_' + selector).show();
$('#previewInputTitle_' + selector).hide();
}
});
$('#previewSpanDescription_' + selector).unbind('click').click(function (e) {
e.stopPropagation();
if (blockDescription === false) {
blockDescription = true;
$('#previewSpanDescription_' + selector).hide();
$('#previewInputDescription_' + selector).show();
$('#previewInputDescription_' + selector).val($('#previewInputDescription_' + selector).val());
$('#previewInputDescription_' + selector).focus().select();
}
});
$('#previewInputDescription_' + selector).blur(function () {
blockDescription = false;
$('#previewSpanDescription_' + selector).html($('#previewInputDescription_' + selector).val());
$('#previewSpanDescription_' + selector).show();
$('#previewInputDescription_' + selector).hide();
});
$('#previewInputDescription_' + selector).keypress(function (e) {
if (e.which === 13) {
blockDescription = false;
$('#previewSpanDescription_' + selector).html($('#previewInputDescription_' + selector).val());
$('#previewSpanDescription_' + selector).show();
$('#previewInputDescription_' + selector).hide();
}
});
$('#previewSpanTitle_' + selector).mouseover(function () {
$('#previewSpanTitle_' + selector).css({
"background-color": "#ff9"
});
});
$('#previewSpanTitle_' + selector).mouseout(function () {
$('#previewSpanTitle_' + selector).css({
"background-color": "transparent"
});
});
$('#previewSpanDescription_' + selector).mouseover(function () {
$('#previewSpanDescription_' + selector).css({
"background-color": "#ff9"
});
});
$('#previewSpanDescription_' + selector).mouseout(function () {
$('#previewSpanDescription_' + selector).css({
"background-color": "transparent"
});
});
$('#closePreview_' + selector).unbind('click').click(function (e) {
e.stopPropagation();
block = false;
images = '';
isActive = false;
firstPosted = false;
$('#preview_' + selector).fadeOut("fast", function () {
$('#preview_' + selector).remove();
$('#profile-rotator').hide();
$('#' + selector).focus();
});
});
};
/**
* Convert attachmant bbcode into an array.
*
* @param {string} content Text content with the attachment bbcode.
* @returns {object || null}
*/
var getAttachmentData = function(content) {
var data = {};
var match = content.match(/(.*)\[attachment(.*?)\](.*?)\[\/attachment\](.*)/ism);
if (match === null || match.length < 5) {
return null;
}
var attributes = match[2];
data.text = trim(match[1]);
var type = '';
var matches = attributes.match(/type='(.*?)'/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
type = matches[1].toLowerCase();
}
matches = attributes.match(/type="(.*?)"/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
type = matches[1].toLowerCase();
}
if (type === '') {
return null;
}
if (
type !== 'link'
&& type !== 'audio'
&& type !== 'photo'
&& type !== 'video')
{
return null;
}
if (type !== '') {
data.type = type;
}
var url = '';
matches = attributes.match(/url='(.*?)'/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
url = matches[1].toLowerCase();
}
matches = attributes.match(/url="(.*?)"/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
url = matches[1].toLowerCase();
}
if(url !== '') {
data.url = escapeHTML(url);
}
var title = '';
matches = attributes.match(/title='(.*?)'/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
title = matches[1].toLowerCase();
}
matches = attributes.match(/title="(.*?)"/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
title = matches[1].toLowerCase();
}
if (title !== '') {
data.title = escapeHTML(title);
}
var image = '';
matches = attributes.match(/image='(.*?)'/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
image = matches[1].toLowerCase();
}
matches = attributes.match(/image="(.*?)"/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
image = matches[1].toLowerCase();
}
if (image !== '') {
data.image = escapeHTML(image);
}
var preview = '';
matches = attributes.match(/preview='(.*?)'/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
preview = matches[1].toLowerCase();
}
matches = attributes.match(/preview="(.*?)"/ism);
if (matches !== null && typeof matches[1] !== 'undefined') {
preview = matches[1].toLowerCase();
}
if (preview !== '') {
data.preview = escapeHTML(preview);
}
data.text = trim(match[3]);
data.after = trim(match[4]);
return data;
};
/**
* Process txt content and if it contains attachment bbcode
* add it to the attachment preview .
*
* @param {string} content
* @returns {void}
*/
var addBBCodeToPreview =function(content) {
var attachmentData = getAttachmentData(content);
if (attachmentData) {
reAddAttachment(attachmentData);
// Remove the attachment bbcode from the textarea.
var content = content.replace(/\[attachment.*\[\/attachment]/ism, '');
$('#' + selector).val(content);
$('#' + selector).focus();
}
};
/**
* Add an Attachment with data from an old bbcode
* generated attachment.
*
* @param {object} json The attachment data.
* @returns {void}
*/
var reAddAttachment = function(json) {
if (isActive) {
$('#profile-rotator').hide();
return;
}
if (json.type !== 'link' && json.type !== 'video' && json.type !== 'photo' || json.url === json.title) {
$('#profile-rotator').hide();
return;
}
var obj = {data: json};
obj = sanitizeInputData(obj);
var data = obj.data;
resetPreview();
processAttachmentTpl(data);
addTitleDescription(data);
addHostToAttachment(data.url);
// Since we don't have an array of image data,
// we need to add the preview images in a different way
// than in function addImagesToAttachment().
var imageClass = 'attachment-preview';
var image = '';
if (data.image !== '') {
imageClass = 'attachment-image';
image = data.image;
} else {
image = data.preview;
}
if (image !== '') {
var appendImage = "<img id='imagePreview_" + selector + "' src='" + image + "' class='" + imageClass + "' ></img>"
$('#previewImage_' + selector).html(appendImage);
$('#attachmentImageSrc_' + selector).val(bin2hex(image));
// We need to add the image widht and height when it is
// loaded.
$('<img/>' ,{
load : function(){
$('#attachmentImageWidth_' + selector).val(this.width);
$('#attachmentImageHeight_' + selector).val(this.height);
},
src : image
});
}
processEventListener();
$('#profile-rotator').hide();
};
/**
* Add missing default properties to the input data object.
*
* @param {object} obj Input data.
* @returns {object}
*/
var sanitizeInputData = function(obj) {
if (typeof obj.contentType === 'undefined'
|| obj.contentType === null)
{
obj.contentType = "";
}
if (typeof obj.data.url === 'undefined'
|| obj.data.url === null)
{
obj.data.url = "";
}
if (typeof obj.data.title === 'undefined'
|| obj.data.title === null
|| obj.data.title === "")
{
obj.data.title = defaultTitle;
}
if (typeof obj.data.text === 'undefined'
|| obj.data.text === null
|| obj.data.text === "")
{
obj.data.text = "";
}
if (typeof obj.data.images === 'undefined'
|| obj.data.images === null)
{
obj.data.images = "";
}
if (typeof obj.data.image === 'undefined'
|| obj.data.image === null)
{
obj.data.image = "";
}
if (typeof obj.data.preview === 'undefined'
|| obj.data.preview === null)
{
obj.data.preview = "";
}
return obj;
};
/**
* Destroy the plugin.
*
* @returns {void}
*/
var destroy = function() {
$('#' + selector).unbind();
$('#preview_' + selector).remove();
binurl;
block = false;
blockTitle = false;
blockDescription = false;
cache = {};
images = "";
isExtern = false;
photoNumber = 0;
firstPosted = false;
isActive = false;
isCrawling = false;
selector = "";
};
var trim = function(str) {
return str.replace(/^\s+|\s+$/g, "");
};
var escapeHTML = function(unsafe_str) {
return unsafe_str
.replace(/&/g, '&amp;')
.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/\"/g, '&quot;')
.replace(/\[/g, '&#91;')
.replace(/\]/g, '&#93;')
.replace(/\'/g, '&#39;'); // '&apos;' is not valid HTML 4
};
// Initialize LinkPreview
init();
return {
// make crawlText() accessable from the outside.
crawlText: function(text) {
crawlText(text);
},
addBBCodeToPreview: function(content) {
addBBCodeToPreview(content);
},
destroy: function() {
destroy();
}
};
};
$.fn.linkPreview.defaults = {
defaultDescription: "Enter a description",
defaultTitle: "Enter a title"
};
/**
* Get in a textarea the previous word before the cursor.
*
* @param {object} text Textarea elemet.
* @param {integer} caretPos Cursor position.
*
* @returns {string} Previous word.
*/
function returnWord(text, caretPos) {
var index = text.indexOf(caretPos);
var preText = text.substring(0, caretPos);
// If the last charachter is a space or enter remove it
// We need this in friendica for the url preview.
var lastChar = preText.slice(-1)
if ( lastChar === " "
|| lastChar === "\n"
|| lastChar === "\r"
)
{
preText = preText.substring(0, preText.length -1);
}
// Replace new line with space.
preText = preText.replace(/\n/g, " ");
if (preText.indexOf(" ") > 0) {
var words = preText.split(" ");
return words[words.length - 1]; //return last word
}
else {
return preText;
}
}
/**
* Get in a textarea the previous word before the cursor.
*
* @param {string} id The ID of a textarea element.
* @returns {sting|null} Previous word or null if no word is available.
*/
function getPrevWord(id) {
var text = document.getElementById(id);
var caretPos = getCaretPosition(text);
var word = returnWord(text.value, caretPos);
if (word != null) {
return word
}
}
/**
* Get the cursor posiotion in an text element.
*
* @param {object} ctrl Textarea elemet.
* @returns {integer} Position of the cursor.
*/
function getCaretPosition(ctrl) {
var CaretPos = 0; // IE Support
if (document.selection) {
ctrl.focus();
var Sel = document.selection.createRange();
Sel.moveStart('character', -ctrl.value.length);
CaretPos = Sel.text.length;
}
// Firefox support
else if (ctrl.selectionStart || ctrl.selectionStart == '0') {
CaretPos = ctrl.selectionStart;
}
return (CaretPos);
}
})(jQuery);