feat: add the tiktok integration

app/api/tiktok/stats/route.ts

@@ -0,0 +1,58 @@
+import { NextResponse } from "next/server";
+import { auth } from "@/lib/auth";
+import { fetchUserStats, refreshAccessToken } from "@/lib/tiktok";
+import { prisma } from "@/lib/prisma";
+
+export async function GET() {
+    const session = await auth();
+
+    if (!session?.user) {
+        return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    }
+
+    const userId = (session.user as { id?: string }).id;
+    if (!userId) {
+        return NextResponse.json({ error: "Session error" }, { status: 401 });
+    }
+
+    const tokenRecord = await prisma.tikTokToken.findUnique({ where: { userId } });
+
+    if (!tokenRecord) {
+        return NextResponse.json({ error: "Not connected" }, { status: 404 });
+    }
+
+    let { accessToken, refreshToken, openId, expiresAt } = tokenRecord;
+
+    // Refresh si expiré (avec 60s de marge)
+    if (expiresAt.getTime() - Date.now() < 60_000) {
+        try {
+            const refreshed = await refreshAccessToken(refreshToken);
+            const newExpiresAt = new Date(Date.now() + refreshed.expires_in * 1000);
+
+            await prisma.tikTokToken.update({
+                where: { userId },
+                data: {
+                    accessToken: refreshed.access_token,
+                    refreshToken: refreshed.refresh_token,
+                    expiresAt: newExpiresAt,
+                },
+            });
+
+            accessToken = refreshed.access_token;
+            refreshToken = refreshed.refresh_token;
+            expiresAt = newExpiresAt;
+        } catch (err) {
+            console.error("[TikTok stats refresh error]", err);
+            return NextResponse.json({ error: "Token refresh failed" }, { status: 401 });
+        }
+    }
+
+    try {
+        const stats = await fetchUserStats(accessToken, openId);
+        return NextResponse.json(stats);
+    } catch (err) {
+        console.error("[TikTok stats fetch error]", err);
+        return NextResponse.json({ error: "Failed to fetch stats" }, { status: 500 });
+    }
+}
+