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 +1,104 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+import { db, recipes, recipeIngredients, recipeSteps } from "@epicure/db";
+import { requireSession } from "@/lib/api-auth";
+import { applyRateLimit } from "@/lib/rate-limit";
+import { checkTierLimit, incrementUsage } from "@/lib/tiers";
+import { importFromPhoto } from "@/lib/ai/features/import-photo";
+import { getModelConfigForUseCase } from "@/lib/ai/resolve-user-key";
+
+const Schema = z.object({
+  imageBase64: z.string().max(14_000_000),
+  mimeType: z.enum(["image/jpeg", "image/png", "image/webp"]),
+});
+
+export async function POST(req: NextRequest) {
+  const { session, response } = await requireSession();
+  if (response) return response;
+
+  const body = await req.json() as unknown;
+  const parsed = Schema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json({ error: "Validation error", issues: parsed.error.issues }, { status: 400 });
+  }
+
+  const limited = await applyRateLimit(`rl:ai:${session!.user.id}`, 5, 60);
+  if (limited) return limited;
+
+  try {
+    await checkTierLimit(session!.user.id, session!.user.tier as "free" | "pro", "aiCall");
+  } catch (err: unknown) {
+    const msg = err instanceof Error ? err.message : "Tier limit reached";
+    return NextResponse.json({ error: msg }, { status: 403 });
+  }
+
+  const userId = session!.user.id;
+  const locale = (session!.user as { locale?: string }).locale ?? "en";
+
+  const aiConfig = await getModelConfigForUseCase(userId, "vision");
+
+  // Fall back to vision-capable defaults if no explicit model configured
+  if (!aiConfig.model) {
+    if (aiConfig.provider === "openai") aiConfig.model = "gpt-4o";
+    else if (aiConfig.provider === "anthropic") aiConfig.model = "claude-sonnet-4-6";
+  }
+
+  let recipe;
+  try {
+    recipe = await importFromPhoto(parsed.data.imageBase64, parsed.data.mimeType, aiConfig, locale);
+  } catch (err: unknown) {
+    const msg = err instanceof Error ? err.message : "AI analysis failed";
+    return NextResponse.json({ error: msg }, { status: 502 });
+  }
+
+  await incrementUsage(userId, "aiCall");
+
+  const newRecipeId = crypto.randomUUID();
+  const now = new Date();
+
+  await db.transaction(async (tx) => {
+    await tx.insert(recipes).values({
+      id: newRecipeId,
+      authorId: userId,
+      title: recipe.title,
+      description: recipe.description,
+      baseServings: recipe.baseServings ?? 4,
+      visibility: "private",
+      difficulty: recipe.difficulty,
+      prepMins: recipe.prepMins,
+      cookMins: recipe.cookMins,
+      dietaryTags: recipe.dietaryTags ?? {},
+      aiGenerated: true,
+      createdAt: now,
+      updatedAt: now,
+    });
+
+    if (recipe.ingredients.length > 0) {
+      await tx.insert(recipeIngredients).values(
+        recipe.ingredients.map((ing, i) => ({
+          id: crypto.randomUUID(),
+          recipeId: newRecipeId,
+          rawName: ing.rawName,
+          quantity: ing.quantity !== undefined ? String(ing.quantity) : undefined,
+          unit: ing.unit,
+          note: ing.note,
+          order: i,
+        }))
+      );
+    }
+
+    if (recipe.steps.length > 0) {
+      await tx.insert(recipeSteps).values(
+        recipe.steps.map((step, i) => ({
+          id: crypto.randomUUID(),
+          recipeId: newRecipeId,
+          instruction: step.instruction,
+          timerSeconds: step.timerSeconds,
+          order: i,
+        }))
+      );
+    }
+  });
+
+  return NextResponse.json({ id: newRecipeId });
+}