Move some functions to Util, Bug Fixes, new stuff

util/Canvas.js

@@ -126,4 +126,24 @@ module.exports = class CanvasUtil {
 			return resolve(lines);
 		});
 	}
+
+	static centerImage(base, data) {
+		const dataRatio = data.width / data.height;
+		const baseRatio = base.width / base.height;
+		let { width, height } = data;
+		let x = 0;
+		let y = 0;
+		if (baseRatio < dataRatio) {
+			height = data.height;
+			width = base.width * (height / base.height);
+			x = (data.width - width) / 2;
+			y = 0;
+		} else if (baseRatio > dataRatio) {
+			width = data.width;
+			height = base.height * (width / base.width);
+			x = 0;
+			y = (data.height - height) / 2;
+		}
+		return { x, y, width, height };
+	}
 };

util/Util.js

@@ -75,6 +75,35 @@ module.exports = class Util {
 		return crypto.createHash(algorithm).update(text).digest('hex');
 	}
 
+	static streamToArray(stream) {
+		if (!stream.readable) return Promise.resolve([]);
+		return new Promise((resolve, reject) => {
+			const array = [];
+			function onData(data) {
+				array.push(data);
+			}
+			function onEnd(error) {
+				if (error) reject(error);
+				else resolve(array);
+				cleanup();
+			}
+			function onClose() {
+				resolve(array);
+				cleanup();
+			}
+			function cleanup() {
+				stream.removeListener('data', onData);
+				stream.removeListener('end', onEnd);
+				stream.removeListener('error', onEnd);
+				stream.removeListener('close', onClose);
+			}
+			stream.on('data', onData);
+			stream.on('end', onEnd);
+			stream.on('error', onEnd);
+			stream.on('close', onClose);
+		});
+	}
+
 	static today(timeZone) {
 		const now = new Date();
 		if (timeZone) now.setUTCHours(timeZone);