FoundKey/src/server/file/send-drive-file.ts

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import * as Koa from 'koa';
import * as send from 'koa-send';
import * as mongodb from 'mongodb';
import DriveFile, { getDriveFileBucket } from '../../models/drive-file';
import DriveFileThumbnail, { getDriveFileThumbnailBucket } from '../../models/drive-file-thumbnail';
import DriveFileWebpublic, { getDriveFileWebpublicBucket } from '../../models/drive-file-webpublic';
import { serverLogger } from '..';
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const assets = `${__dirname}/../../server/file/assets/`;
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const commonReadableHandlerGenerator = (ctx: Koa.BaseContext) => (e: Error): void => {
serverLogger.error(e);
ctx.status = 500;
};
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export default async function(ctx: Koa.BaseContext) {
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// Validate id
if (!mongodb.ObjectID.isValid(ctx.params.id)) {
ctx.throw(400, 'incorrect id');
return;
}
const fileId = new mongodb.ObjectID(ctx.params.id);
// Fetch drive file
const file = await DriveFile.findOne({ _id: fileId });
if (file == null) {
ctx.status = 404;
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await send(ctx as any, '/dummy.png', { root: assets });
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return;
}
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if (file.metadata.deletedAt) {
ctx.status = 410;
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await send(ctx as any, '/tombstone.png', { root: assets });
return;
}
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if (file.metadata.withoutChunks) {
ctx.status = 204;
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return;
}
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const sendRaw = async () => {
if (file.metadata && file.metadata.accessKey && file.metadata.accessKey != ctx.query['original']) {
ctx.status = 403;
return;
}
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const bucket = await getDriveFileBucket();
const readable = bucket.openDownloadStream(fileId);
readable.on('error', commonReadableHandlerGenerator(ctx));
ctx.set('Content-Type', file.contentType);
ctx.body = readable;
};
if ('thumbnail' in ctx.query) {
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const thumb = await DriveFileThumbnail.findOne({
'metadata.originalId': fileId
});
if (thumb != null) {
ctx.set('Content-Type', 'image/jpeg');
const bucket = await getDriveFileThumbnailBucket();
ctx.body = bucket.openDownloadStream(thumb._id);
} else {
if (file.contentType.startsWith('image/')) {
await sendRaw();
} else {
ctx.status = 404;
await send(ctx as any, '/dummy.png', { root: assets });
}
}
} else if ('web' in ctx.query) {
const web = await DriveFileWebpublic.findOne({
'metadata.originalId': fileId
});
if (web != null) {
ctx.set('Content-Type', file.contentType);
const bucket = await getDriveFileWebpublicBucket();
ctx.body = bucket.openDownloadStream(web._id);
} else {
await sendRaw();
}
} else {
if ('download' in ctx.query) {
ctx.set('Content-Disposition', 'attachment');
}
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await sendRaw();
}
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}