68 lines
2.1 KiB
TypeScript
68 lines
2.1 KiB
TypeScript
import { Handlers } from 'fresh/server.ts';
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import { resize } from 'https://deno.land/x/deno_image@0.0.4/mod.ts';
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import { FreshContextState } from '/lib/types.ts';
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import { getFile } from '/lib/data/files.ts';
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interface Data {}
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const MIN_WIDTH = 25;
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const MIN_HEIGHT = 25;
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const MAX_WIDTH = 2048;
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const MAX_HEIGHT = 2048;
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export const handler: Handlers<Data, FreshContextState> = {
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async GET(request, context) {
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if (!context.state.user) {
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return new Response('Redirect', { status: 303, headers: { 'Location': `/login` } });
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}
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const { fileName } = context.params;
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if (!fileName) {
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return new Response('Not Found', { status: 404 });
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}
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const searchParams = new URL(request.url).searchParams;
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let currentPath = searchParams.get('path') || '/';
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// Send invalid paths back to root
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if (!currentPath.startsWith('/') || currentPath.includes('../')) {
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currentPath = '/';
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}
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// Always append a trailing slash
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if (!currentPath.endsWith('/')) {
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currentPath = `${currentPath}/`;
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}
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const fileResult = await getFile(context.state.user.id, currentPath, decodeURIComponent(fileName));
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if (!fileResult.success) {
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return new Response('Not Found', { status: 404 });
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}
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const width = parseInt(searchParams.get('width') || '500', 10);
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const height = parseInt(searchParams.get('height') || '500', 10);
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if (
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fileResult.contentType?.split('/')[0] !== 'image' || isNaN(width) || isNaN(height) ||
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width > MAX_WIDTH || height > MAX_HEIGHT || width < MIN_WIDTH || height < MIN_HEIGHT
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) {
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return new Response('Bad Request', { status: 400 });
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}
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const resizedImageContents = await resize(fileResult.contents!, { width, height, aspectRatio: true });
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return new Response(resizedImageContents, {
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status: 200,
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headers: {
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'cache-control': `max-age=${604_800}`, // Tell browsers to cache for 1 week (60 * 60 * 24 * 7 = 604_800)
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'content-type': fileResult.contentType!,
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'content-length': resizedImageContents.byteLength.toString(),
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},
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});
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},
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};
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