78 lines
2.1 KiB
TypeScript
78 lines
2.1 KiB
TypeScript
import * as fs from 'fs';
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import * as Koa from 'koa';
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import * as send from 'koa-send';
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import * as mongodb from 'mongodb';
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import DriveFile, { getDriveFileBucket } from '../../models/drive-file';
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import DriveFileThumbnail, { getDriveFileThumbnailBucket } from '../../models/drive-file-thumbnail';
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const assets = `${__dirname}/../../server/file/assets/`;
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const commonReadableHandlerGenerator = (ctx: Koa.Context) => (e: Error): void => {
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console.error(e);
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ctx.status = 500;
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};
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export default async function(ctx: Koa.Context) {
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// Validate id
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if (!mongodb.ObjectID.isValid(ctx.params.id)) {
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ctx.throw(400, 'incorrect id');
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return;
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}
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const fileId = new mongodb.ObjectID(ctx.params.id);
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// Fetch drive file
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const file = await DriveFile.findOne({ _id: fileId });
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if (file == null) {
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ctx.status = 404;
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await send(ctx, '/dummy.png', { root: assets });
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return;
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}
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if (file.metadata.deletedAt) {
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ctx.status = 410;
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if (file.metadata.isExpired) {
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await send(ctx, '/cache-expired.png', { root: assets });
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} else {
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await send(ctx, '/tombstone.png', { root: assets });
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}
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return;
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}
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const sendRaw = async () => {
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const bucket = await getDriveFileBucket();
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const readable = bucket.openDownloadStream(fileId);
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readable.on('error', commonReadableHandlerGenerator(ctx));
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ctx.set('Content-Type', file.contentType);
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ctx.body = readable;
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};
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if ('thumbnail' in ctx.query) {
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// 画像以外
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if (!file.contentType.startsWith('image/')) {
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const readable = fs.createReadStream(`${__dirname}/assets/thumbnail-not-available.png`);
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ctx.set('Content-Type', 'image/png');
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ctx.body = readable;
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} else if (file.contentType == 'image/gif') {
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// GIF
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await sendRaw();
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} else {
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const thumb = await DriveFileThumbnail.findOne({ 'metadata.originalId': fileId });
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if (thumb != null) {
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ctx.set('Content-Type', 'image/jpeg');
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const bucket = await getDriveFileThumbnailBucket();
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ctx.body = bucket.openDownloadStream(thumb._id);
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} else {
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await sendRaw();
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}
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}
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} else {
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if ('download' in ctx.query) {
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ctx.set('Content-Disposition', 'attachment');
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}
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await sendRaw();
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}
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}
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