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import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { env } from "@/env";
import { baseRateLimit } from "@/lib/rate-limit";
import { isTranscriptionConfigured } from "@/lib/transcription-utils";
const transcribeRequestSchema = z.object({
filename: z.string().min(1, "Filename is required"),
language: z.string().optional().default("auto"),
decryptionKey: z.string().min(1, "Decryption key is required").optional(),
iv: z.string().min(1, "IV is required").optional(),
});
const modalResponseSchema = z.object({
text: z.string(),
segments: z.array(
z.object({
id: z.number(),
seek: z.number(),
start: z.number(),
end: z.number(),
text: z.string(),
tokens: z.array(z.number()),
temperature: z.number(),
avg_logprob: z.number(),
compression_ratio: z.number(),
no_speech_prob: z.number(),
})
),
language: z.string(),
});
const apiResponseSchema = z.object({
text: z.string(),
segments: z.array(
z.object({
id: z.number(),
seek: z.number(),
start: z.number(),
end: z.number(),
text: z.string(),
tokens: z.array(z.number()),
temperature: z.number(),
avg_logprob: z.number(),
compression_ratio: z.number(),
no_speech_prob: z.number(),
})
),
language: z.string(),
});
export async function POST(request: NextRequest) {
try {
// Rate limiting
const ip = request.headers.get("x-forwarded-for") ?? "anonymous";
const { success } = await baseRateLimit.limit(ip);
const origin = request.headers.get("origin");
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 = transcribeRequestSchema.safeParse(rawBody);
if (!validationResult.success) {
return NextResponse.json(
{
error: "Invalid request parameters",
details: validationResult.error.flatten().fieldErrors,
},
{ status: 400 }
);
}
const { filename, language, decryptionKey, iv } = validationResult.data;
// Prepare request body for Modal
const modalRequestBody: any = {
filename,
language,
};
// Add encryption parameters if provided (zero-knowledge)
if (decryptionKey && iv) {
modalRequestBody.decryptionKey = decryptionKey;
modalRequestBody.iv = iv;
}
// Call Modal transcription service
const response = await fetch(env.MODAL_TRANSCRIPTION_URL, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(modalRequestBody),
});
if (!response.ok) {
const errorText = await response.text();
console.error("Modal API error:", response.status, errorText);
let errorMessage = "Transcription service unavailable";
try {
const errorData = JSON.parse(errorText);
errorMessage = errorData.error || errorMessage;
} catch {
// Use default message if parsing fails
}
return NextResponse.json(
{
error: errorMessage,
message: "Failed to process transcription request",
},
{ status: response.status >= 500 ? 502 : response.status }
);
}
const rawResult = await response.json();
console.log("Raw Modal response:", JSON.stringify(rawResult, null, 2));
// Validate Modal response
const modalValidation = modalResponseSchema.safeParse(rawResult);
if (!modalValidation.success) {
console.error("Invalid Modal API response:", modalValidation.error);
return NextResponse.json(
{ error: "Invalid response from transcription service" },
{ status: 502 }
);
}
const result = modalValidation.data;
// Prepare and validate API response
const responseData = {
text: result.text,
segments: result.segments,
language: result.language,
};
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("Transcription API error:", error);
return NextResponse.json(
{
error: "Internal server error",
message: "An unexpected error occurred during transcription",
},
{ status: 500 }
);
}
}
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