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src/lib/tiktok.ts

@@ -52,8 +52,88 @@ export async function getValidTiktokTokens() {
       scope: tokens.scope || null,
       accessTokenExpiresAt: new Date(now + Number(tokens.expires_in || 0) * 1000),
       refreshTokenExpiresAt: tokens.refresh_expires_in
-        ? new Date(now + Number(tokens.refresh_expires_in) * 1000)
+        ? new Date(now + Number(tokens.refresh_expires_in || 0) * 1000)
         : null,
     },
   });
 }
+
+const REFRESH_BUFFER_MS = 5 * 60 * 1000;
+
+export async function getLiveTiktokAccessToken() {
+  const integration = await db.tiktokIntegration.findUnique({
+    where: { accountKey: TIKTOK_ACCOUNT_KEY },
+  });
+  if (!integration) {
+    const error = new Error('No TikTok account connected.');
+    error.status = 404;
+    throw error;
+  }
+
+  if (integration.accessTokenExpiresAt.getTime() - Date.now() > REFRESH_BUFFER_MS) {
+    return integration;
+  }
+
+  const clientKey = process.env.TIKTOK_CLIENT_KEY;
+  const clientSecret = process.env.TIKTOK_CLIENT_SECRET;
+  if (!clientKey || !clientSecret) {
+    const error = new Error('TikTok client credentials are not configured.');
+    error.status = 500;
+    throw error;
+  }
+
+  return getValidTiktokTokens();
+}
+
+export async function tiktokApi(url: string, options: RequestInit = {}) {
+  const tokens = await getLiveTiktokAccessToken();
+  const accessToken = tokens.accessToken;
+
+  const fetchOptions: RequestInit = {
+    ...options,
+    headers: {
+      ...(options.headers as Record<string, string> | undefined),
+      Authorization: `Bearer ${accessToken}`,
+      'Content-Type': 'application/json; charset=UTF-8',
+    },
+  };
+
+  const res = await fetch(url, fetchOptions);
+  const text = await res.text();
+  let data: Record<string, unknown>;
+  try {
+    data = JSON.parse(text) as Record<string, unknown>;
+  } catch {
+    data = { raw: text };
+  }
+
+  if (!res.ok || (data?.error as Record<string, string> | undefined)?.code !== 'ok') {
+    const message = (data?.error as Record<string, string> | undefined)?.message || (typeof data?.raw === 'string' ? data.raw : '') || `TikTok API error: ${res.status}`;
+    const error = new Error(message);
+    error.status = res.status;
+    error.body = data;
+    throw error;
+  }
+
+  return data;
+}
+
+export async function uploadBinaryToTiktok(uploadUrl: string, buffer: Buffer, mimeType = 'video/mp4') {
+  const res = await fetch(uploadUrl, {
+    method: 'PUT',
+    headers: {
+      'Content-Type': mimeType,
+      'Content-Length': String(buffer.length),
+    },
+    body: buffer,
+  });
+
+  const text = await res.text();
+  if (!res.ok && res.status !== 201) {
+    const error = new Error(`TikTok binary upload failed: ${res.status} ${text}`);
+    error.status = res.status;
+    throw error;
+  }
+
+  return { status: res.status, body: text };
+}