93 lines
2.8 KiB
TypeScript
93 lines
2.8 KiB
TypeScript
import { NextRequest, NextResponse } from 'next/server';
|
|
import { isPublicHttpUrl } from '@/lib/security/url-guard';
|
|
|
|
const MAX_RESPONSE_SIZE = 10 * 1024 * 1024; // 10MB
|
|
const FETCH_TIMEOUT_MS = 15000;
|
|
|
|
export async function POST(request: NextRequest) {
|
|
let body: { url?: string };
|
|
try {
|
|
body = await request.json();
|
|
} catch {
|
|
return NextResponse.json({ error: 'Invalid request body' }, { status: 400 });
|
|
}
|
|
|
|
const { url } = body;
|
|
|
|
if (!url || typeof url !== 'string') {
|
|
return NextResponse.json({ error: 'URL is required' }, { status: 400 });
|
|
}
|
|
|
|
if (!(await isPublicHttpUrl(url))) {
|
|
return NextResponse.json({ error: 'Invalid or disallowed URL' }, { status: 400 });
|
|
}
|
|
|
|
try {
|
|
const controller = new AbortController();
|
|
const timeout = setTimeout(() => controller.abort(), FETCH_TIMEOUT_MS);
|
|
|
|
const MAX_REDIRECTS = 5;
|
|
let currentUrl = url;
|
|
let response: Response | undefined;
|
|
|
|
for (let i = 0; i <= MAX_REDIRECTS; i++) {
|
|
if (!(await isPublicHttpUrl(currentUrl))) {
|
|
clearTimeout(timeout);
|
|
return NextResponse.json({ error: 'Redirect to disallowed URL' }, { status: 400 });
|
|
}
|
|
|
|
response = await fetch(currentUrl, {
|
|
signal: controller.signal,
|
|
headers: {
|
|
'Accept': 'text/calendar, application/ics, text/plain, */*',
|
|
'User-Agent': 'JMAP-Webmail/1.0 Calendar-Fetcher',
|
|
},
|
|
redirect: 'manual',
|
|
});
|
|
|
|
if (response.status >= 300 && response.status < 400) {
|
|
const location = response.headers.get('location');
|
|
if (!location) {
|
|
clearTimeout(timeout);
|
|
return NextResponse.json({ error: 'Redirect without Location header' }, { status: 502 });
|
|
}
|
|
currentUrl = new URL(location, currentUrl).toString();
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
clearTimeout(timeout);
|
|
|
|
if (!response || !response.ok) {
|
|
return NextResponse.json(
|
|
{ error: `Remote server returned ${response?.status ?? 'unknown'}` },
|
|
{ status: 502 }
|
|
);
|
|
}
|
|
|
|
const contentLength = response.headers.get('content-length');
|
|
if (contentLength && parseInt(contentLength) > MAX_RESPONSE_SIZE) {
|
|
return NextResponse.json({ error: 'File too large' }, { status: 413 });
|
|
}
|
|
|
|
const buffer = await response.arrayBuffer();
|
|
if (buffer.byteLength > MAX_RESPONSE_SIZE) {
|
|
return NextResponse.json({ error: 'File too large' }, { status: 413 });
|
|
}
|
|
|
|
return new NextResponse(buffer, {
|
|
status: 200,
|
|
headers: {
|
|
'Content-Type': 'text/calendar',
|
|
'Content-Length': buffer.byteLength.toString(),
|
|
},
|
|
});
|
|
} catch (error: unknown) {
|
|
if (error instanceof Error && error.name === 'AbortError') {
|
|
return NextResponse.json({ error: 'Request timed out' }, { status: 504 });
|
|
}
|
|
return NextResponse.json({ error: 'Failed to fetch calendar' }, { status: 502 });
|
|
}
|
|
}
|