feat(ai): Vercel AI SDK provider factory with BYOK and per-use-case model prefs

Provider factory (OpenAI/Anthropic/OpenRouter/Ollama). generateObject for all outputs. Features: recipe generation, photo-to-recipe vision, variations, drink/meal pairings, ingredient substitution, recipe adaptation, nutrition analysis, URL import, meal plan gen. User BYOK keys (AES-256-GCM). Per-use-case model preferences (text/vision/mealPlan). Site-level key override via admin settings.
2026-07-01 08:10:19 +02:00
parent 84d6cfeb07
commit d9d58fd01a
26 changed files with 1656 additions and 0 deletions
@@ -0,0 +1,62 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+import { db, recipes, eq, and, or } from "@epicure/db";
+import { requireSession } from "@/lib/api-auth";
+import { applyRateLimit } from "@/lib/rate-limit";
+import { getDefaultProviderWithKey } from "@/lib/ai/resolve-user-key";
+import { checkTierLimit, incrementUsage } from "@/lib/tiers";
+import { scaleRecipe } from "@/lib/ai/features/scale-recipe";
+
+const Schema = z.object({
+  recipeId: z.string(),
+  targetServings: z.number().int().min(1).max(100),
+});
+
+export async function POST(req: NextRequest) {
+  const { session, response } = await requireSession();
+  if (response) return response;
+
+  const limited = await applyRateLimit(`rl:ai:scale:${session!.user.id}`, 20, 60);
+  if (limited) return limited;
+
+  const body = await req.json() as unknown;
+  const parsed = Schema.safeParse(body);
+  if (!parsed.success) return NextResponse.json({ error: "Validation error" }, { status: 400 });
+
+  const { recipeId, targetServings } = parsed.data;
+
+  const recipe = await db.query.recipes.findFirst({
+    where: and(
+      eq(recipes.id, recipeId),
+      or(
+        eq(recipes.authorId, session!.user.id),
+        eq(recipes.visibility, "public")
+      )
+    ),
+    with: { ingredients: true },
+  });
+
+  if (!recipe) {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+
+  await checkTierLimit(session!.user.id, session!.user.tier as "free" | "pro", "aiCall");
+
+  const aiConfig = await getDefaultProviderWithKey(session!.user.id);
+
+  const scaledIngredients = await scaleRecipe(
+    {
+      title: recipe.title,
+      baseServings: recipe.baseServings,
+      ingredients: recipe.ingredients,
+    },
+    targetServings,
+    recipe.baseServings,
+    aiConfig,
+    (session!.user as { locale?: string }).locale ?? "en"
+  );
+
+  await incrementUsage(session!.user.id, "aiCall");
+
+  return NextResponse.json({ ingredients: scaledIngredients });
+}