From e36a7081324b9e538ae40918072edd93ebc9b2cb Mon Sep 17 00:00:00 2001
From: syuilo <syuilotan@yahoo.co.jp>
Date: Mon, 11 Dec 2017 13:33:33 +0900
Subject: #986

---
 src/api/common/add-file-to-drive.ts | 39 +++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

(limited to 'src/api/common')

diff --git a/src/api/common/add-file-to-drive.ts b/src/api/common/add-file-to-drive.ts
index 109e886106..427b54d72b 100644
--- a/src/api/common/add-file-to-drive.ts
+++ b/src/api/common/add-file-to-drive.ts
@@ -110,7 +110,7 @@ const addFile = async (
 		}
 	}
 
-	const [wh, folder] = await Promise.all([
+	const [wh, averageColor, folder] = await Promise.all([
 		// Width and height (when image)
 		(async () => {
 			// 画像かどうか
@@ -125,14 +125,45 @@ const addFile = async (
 				return null;
 			}
 
+			log('calculate image width and height...');
+
 			// Calculate width and height
 			const g = gm(fs.createReadStream(path), name);
 			const size = await prominence(g).size();
 
-			log('image width and height is calculated');
+			log(`image width and height is calculated: ${size.width}, ${size.height}`);
 
 			return [size.width, size.height];
 		})(),
+		// average color (when image)
+		(async () => {
+			// 画像かどうか
+			if (!/^image\/.*$/.test(mime)) {
+				return null;
+			}
+
+			const imageType = mime.split('/')[1];
+
+			// 画像でもPNGかJPEGでないならスキップ
+			if (imageType != 'png' && imageType != 'jpeg') {
+				return null;
+			}
+
+			log('calculate average color...');
+
+			const buffer = await prominence(gm(fs.createReadStream(path), name)
+				.setFormat('ppm')
+				.resize(1, 1)) // 1pxのサイズに縮小して平均色を取得するというハック
+				.toBuffer();
+
+			const r = buffer.readUInt8(buffer.length - 3);
+			const g = buffer.readUInt8(buffer.length - 2);
+			const b = buffer.readUInt8(buffer.length - 1);
+
+			log(`average color is calculated: ${r}, ${g}, ${b}`);
+
+			return [r, g, b];
+		})(),
 		// folder
 		(async () => {
 			if (!folderId) {
@@ -188,6 +219,10 @@ const addFile = async (
 		properties['height'] = wh[1];
 	}
 
+	if (averageColor) {
+		properties['average_color'] = averageColor;
+	}
+
 	return addToGridFS(detectedName, readable, mime, {
 		user_id: user._id,
 		folder_id: folder !== null ? folder._id : null,
-- 
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