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import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { AwsClient } from "aws4fetch";
import { nanoid } from "nanoid";
import { env } from "@/env";
import { baseRateLimit } from "@/lib/rate-limit";
import { isTranscriptionConfigured } from "@/lib/transcription-utils";
const uploadRequestSchema = z.object({
fileExtension: z.enum(["wav", "mp3", "m4a", "flac"], {
errorMap: () => ({
message: "File extension must be wav, mp3, m4a, or flac",
}),
}),
});
const apiResponseSchema = z.object({
uploadUrl: z.string().url(),
fileName: z.string().min(1),
});
export async function POST(request: NextRequest) {
try {
// Rate limiting
const ip = request.headers.get("x-forwarded-for") ?? "anonymous";
const { success } = await baseRateLimit.limit(ip);
if (!success) {
return NextResponse.json({ error: "Too many requests" }, { status: 429 });
}
// Check transcription configuration
const transcriptionCheck = isTranscriptionConfigured();
if (!transcriptionCheck.configured) {
console.error(
"Missing environment variables:",
JSON.stringify(transcriptionCheck.missingVars)
);
return NextResponse.json(
{
error: "Transcription not configured",
message: `Auto-captions require environment variables: ${transcriptionCheck.missingVars.join(", ")}. Check README for setup instructions.`,
},
{ status: 503 }
);
}
// Parse and validate request body
const rawBody = await request.json().catch(() => null);
if (!rawBody) {
return NextResponse.json(
{ error: "Invalid JSON in request body" },
{ status: 400 }
);
}
const validationResult = uploadRequestSchema.safeParse(rawBody);
if (!validationResult.success) {
return NextResponse.json(
{
error: "Invalid request parameters",
details: validationResult.error.flatten().fieldErrors,
},
{ status: 400 }
);
}
const { fileExtension } = validationResult.data;
// Initialize R2 client
const client = new AwsClient({
accessKeyId: env.R2_ACCESS_KEY_ID,
secretAccessKey: env.R2_SECRET_ACCESS_KEY,
});
// Generate unique filename with timestamp
const timestamp = Date.now();
const fileName = `audio/${timestamp}-${nanoid()}.${fileExtension}`;
// Create presigned URL
const url = new URL(
`https://${env.R2_BUCKET_NAME}.${env.CLOUDFLARE_ACCOUNT_ID}.r2.cloudflarestorage.com/${fileName}`
);
url.searchParams.set("X-Amz-Expires", "3600"); // 1 hour expiry
const signed = await client.sign(new Request(url, { method: "PUT" }), {
aws: { signQuery: true },
});
if (!signed.url) {
throw new Error("Failed to generate presigned URL");
}
// Prepare and validate response
const responseData = {
uploadUrl: signed.url,
fileName,
};
const responseValidation = apiResponseSchema.safeParse(responseData);
if (!responseValidation.success) {
console.error(
"Invalid API response structure:",
responseValidation.error
);
return NextResponse.json(
{ error: "Internal response formatting error" },
{ status: 500 }
);
}
return NextResponse.json(responseValidation.data);
} catch (error) {
console.error("Error generating upload URL:", error);
return NextResponse.json(
{
error: "Failed to generate upload URL",
message:
error instanceof Error
? error.message
: "An unexpected error occurred",
},
{ status: 500 }
);
}
}
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