111 lines
2.5 KiB
TypeScript
111 lines
2.5 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, THUMBNAILS_DIR } from "../config.ts";
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const router = new Router({ prefix: "/api/thumbnails" });
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async function ffmpegAvailable(): Promise<boolean> {
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try {
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const cmd = new Deno.Command("ffmpeg", {
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args: ["-version"],
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stderr: "null",
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stdout: "null",
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});
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const { success } = await cmd.output();
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return success;
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} catch {
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return false;
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}
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}
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async function generateThumbnail(
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srcPath: string,
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outPath: string,
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): Promise<void> {
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await Deno.mkdir(THUMBNAILS_DIR, { recursive: true });
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const cmd = new Deno.Command("ffmpeg", {
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args: [
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"-ss",
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"00:00:01",
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"-i",
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srcPath,
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"-frames:v",
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"1",
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"-vf",
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"scale=320:-1",
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"-f",
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"image2",
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"-y",
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outPath,
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],
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stdout: "null",
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stderr: "null",
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});
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const { success } = await cmd.output();
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if (!success) throw new Error("ffmpeg failed");
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}
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router.get("/:dumpId", async (ctx) => {
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const { dumpId } = ctx.params;
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if (!/^[0-9a-f-]{36}$/.test(dumpId)) {
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throw new APIException(APIErrorCode.BAD_REQUEST, 400, "Invalid dump ID");
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}
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const dump = getDump(dumpId);
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if (dump.kind !== "file" || !dump.fileMime?.startsWith("video/")) {
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throw new APIException(
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APIErrorCode.NOT_FOUND,
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404,
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"No video for this dump",
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);
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}
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const thumbPath = `${THUMBNAILS_DIR}/${dumpId}.jpg`;
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// Serve cached thumbnail if it exists
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try {
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const data = await Deno.readFile(thumbPath);
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ctx.response.headers.set("Content-Type", "image/jpeg");
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ctx.response.headers.set(
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"Cache-Control",
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"public, max-age=31536000, immutable",
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);
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ctx.response.body = data;
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return;
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} catch {
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// Not cached yet — generate it
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}
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if (!await ffmpegAvailable()) {
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throw new APIException(
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APIErrorCode.NOT_FOUND,
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404,
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"Thumbnail generation unavailable",
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);
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}
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const srcPath = `${DUMPS_DIR}/${dumpId}`;
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try {
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await generateThumbnail(srcPath, thumbPath);
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} catch {
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throw new APIException(
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APIErrorCode.NOT_FOUND,
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404,
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"Could not generate thumbnail",
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);
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}
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const data = await Deno.readFile(thumbPath);
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ctx.response.headers.set("Content-Type", "image/jpeg");
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ctx.response.headers.set(
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"Cache-Control",
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"public, max-age=31536000, immutable",
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);
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ctx.response.body = data;
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});
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export default router;
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