78 lines
2.2 KiB
TypeScript
78 lines
2.2 KiB
TypeScript
import { Router } from "@oak/oak";
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import { APIErrorCode, APIException } from "../model/interfaces.ts";
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import { getDump } from "../services/dump-service.ts";
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import { DUMPS_DIR } from "../utils/upload.ts";
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const router = new Router({ prefix: "/api/files" });
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router.get("/:dumpId", async (ctx) => {
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const { dumpId } = ctx.params;
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// Guard against path traversal (UUIDs are safe, but be explicit)
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if (!/^[0-9a-f-]{36}$/.test(dumpId)) {
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throw new APIException(APIErrorCode.BAD_REQUEST, 400, "Invalid dump ID");
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}
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const dump = getDump(dumpId);
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if (dump.kind !== "file" || !dump.fileMime || !dump.fileName) {
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throw new APIException(
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APIErrorCode.NOT_FOUND,
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404,
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"No file for this dump",
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);
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}
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const path = `${DUMPS_DIR}/${dumpId}`;
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let data: Uint8Array;
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try {
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data = await Deno.readFile(path);
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} catch {
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throw new APIException(APIErrorCode.NOT_FOUND, 404, "File not found");
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}
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const total = data.byteLength;
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ctx.response.headers.set("Content-Type", dump.fileMime);
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ctx.response.headers.set(
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"Content-Disposition",
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`inline; filename="${dump.fileName}"`,
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);
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ctx.response.headers.set("Accept-Ranges", "bytes");
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const rangeHeader = ctx.request.headers.get("Range");
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if (rangeHeader) {
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const match = rangeHeader.match(/^bytes=(\d*)-(\d*)$/);
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if (!match) {
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ctx.response.status = 416;
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ctx.response.headers.set("Content-Range", `bytes */${total}`);
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return;
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}
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const start = match[1]
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? parseInt(match[1], 10)
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: total - parseInt(match[2], 10);
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const end = match[2]
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? Math.min(parseInt(match[2], 10), total - 1)
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: total - 1;
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if (start > end || start >= total) {
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ctx.response.status = 416;
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ctx.response.headers.set("Content-Range", `bytes */${total}`);
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return;
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}
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const chunk = data.subarray(start, end + 1);
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ctx.response.status = 206;
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ctx.response.headers.set("Content-Range", `bytes ${start}-${end}/${total}`);
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ctx.response.headers.set("Content-Length", String(chunk.byteLength));
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ctx.response.body = chunk;
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} else {
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ctx.response.headers.set("Content-Length", String(total));
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ctx.response.body = data;
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}
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});
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export default router;
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