From 15e4cf1243001873edd1860ee61bc96d003214ee Mon Sep 17 00:00:00 2001
From: syuilo <syuilotan@yahoo.co.jp>
Date: Thu, 3 May 2018 20:03:14 +0900
Subject: サムネイルを予め生成するように
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---
 src/drive/gen-thumbnail.ts | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 src/drive/gen-thumbnail.ts

(limited to 'src/drive')

diff --git a/src/drive/gen-thumbnail.ts b/src/drive/gen-thumbnail.ts
new file mode 100644
index 0000000000..455705cd3a
--- /dev/null
+++ b/src/drive/gen-thumbnail.ts
@@ -0,0 +1,25 @@
+import * as stream from 'stream';
+import * as Gm from 'gm';
+import { IDriveFile, getDriveFileBucket } from '../models/drive-file';
+
+const gm = Gm.subClass({
+	imageMagick: true
+});
+
+export default async function(file: IDriveFile): Promise<stream.Readable> {
+	if (!/^image\/.*$/.test(file.contentType)) return null;
+
+	const bucket = await getDriveFileBucket();
+	const readable = bucket.openDownloadStream(file._id);
+
+	const g = gm(readable);
+
+	const stream = g
+		.resize(256, 256)
+		.compress('jpeg')
+		.quality(70)
+		.interlace('line')
+		.stream();
+
+	return stream;
+}
-- 
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