fix(twitter): Support for twitter embedding added

Author: ritz078

src/embed.es6

@@ -19,42 +19,56 @@
 //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 //SOFTWARE.
 
-import utils  from './modules/utils.es6';
-import Emoji  from './modules/emoticons/emoji.es6';
-import Smiley from './modules/emoticons/smiley.es6';
-import Url    from './modules/url.es6';
-import Code   from './modules/code.es6';
+import utils   from './modules/utils.es6';
+import Emoji   from './modules/emoticons/emoji.es6';
+import Smiley  from './modules/emoticons/smiley.es6';
+import Url     from './modules/url.es6';
+import Code    from './modules/code.es6';
+import Twitter from './modules/twitter.es6';
 
-(function () {
+(function() {
 
-	var defaultOptions = {
-		link          : true,
-		linkTarget    : 'self',
-		linkExclude   : ['pdf'],
-		emoji         : true,
-		fontIcons     : true,
-		highlightCode : true
-	};
+    var defaultOptions = {
+        link          : true,
+        linkTarget    : 'self',
+        linkExclude   : ['pdf'],
+        emoji         : true,
+        fontIcons     : true,
+        highlightCode : true,
+        tweetsEmbed   : true,
+        tweetOptions: {
+            maxWidth   : 550,
+            hideMedia  : false,
+            hideThread : false,
+            align      : 'none',
+            lang       : 'en'
+        }
+    };
 
-	class EmbedJS {
-		constructor(options) {
-			this.options = utils.deepExtend(defaultOptions,options);
-			this.element = this.options.element;
-			this.input = this.element.innerHTML;
-			this.process();
-		}
+    class EmbedJS {
+        constructor(options) {
+            this.options = utils.deepExtend(defaultOptions, options);
+            this.element = this.options.element;
+            this.input   = this.element.innerHTML;
+            this.process();
+        }
 
-		async process(){
-			let input   = this.input;
-			let options = this.options;
-			input = options.link          ? await (new Url(input,    options).process())   : input;
-			input = options.emoji         ? await (new Emoji(input,  options).process())   : input;
-			input = options.fontIcons     ? await (new Smiley(input, options).process())   : input;
-			input = options.highlightCode ? await (new Code(input,   options).process())   : input;
+        async process() {
+            let input = this.input;
+            let options = this.options;
+            input = options.link          ? await (new Url(input,     options).process()) : input;
+            input = options.emoji         ? await (new Emoji(input,   options).process()) : input;
+            input = options.fontIcons     ? await (new Smiley(input,  options).process()) : input;
+            input = options.highlightCode ? await (new Code(input,    options).process()) : input;
+            if (options.tweetsEmbed){
+            	var twitter = new Twitter(input, options);
+            	input = options.tweetsEmbed   ? await (twitter.process()) : input;
+            }
 
-			options.element.innerHTML = input;
-		}
-	}
+            options.element.innerHTML = input;
+            twitter.load();
+        }
+    }
 
-	window.EmbedJS = EmbedJS;
+    window.EmbedJS = EmbedJS;
 })();

src/modules/twitter.es6

@@ -0,0 +1,40 @@
+import utils from './utils.es6';
+
+class Twitter {
+    constructor(input, options) {
+        this.input = input;
+        this.options = options;
+        this.regex = /https:\/\/twitter\.com\/\w+\/\w+\/\d+/gi;
+    }
+
+    async tweetData(url) {
+        let config = this.options.tweetOptions;
+        let apiUrl = `https://api.twitter.com/1/statuses/oembed.json?omit_script=true&url=${url}&maxwidth=${config.maxWidth}&hide_media=${config.hideMedia}&hide_thread=${config.hideThread}&align=${config.align}&lang=${config.lang}`;
+        let response = await fetchJsonp(apiUrl, {
+            credentials: 'include'
+        });
+        let data = await response.json();
+        return data;
+    }
+
+    matches() {
+        let x;
+        return (x = this.input.match(this.regex)) ? x : null;
+    }
+
+    load() {
+        twttr.widgets.load(this.options.element);
+    }
+
+    async process() {
+        var result = this.input;
+        let matches = utils.getUnique(this.matches());
+        for (let match of matches) {
+            let data = await this.tweetData(match);
+            result += data.html;
+        }
+        return result;
+    }
+}
+
+module.exports = Twitter;