Add automatic Gemini 3.1 Flash-Lite vector mockup fallback when Free Tier key reports limit: 0 for Nano Banana 2.1
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airent106 committed
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+116
-34
@@ -5,8 +5,8 @@ import { GoogleGenAI } from "@google/genai";
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export const NANO_BANANA_MODELS = [
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{
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id: "gemini-nano-banana-2.1",
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label: "Nano Banana 2.1 (Default High-Efficiency)",
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description: "gemini-nano-banana-2.1 — Fast, high-efficiency native image generation and conversational editing"
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label: "Nano Banana 2.1 (Default High-Efficiency + Free-Tier Auto Fallback)",
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description: "gemini-nano-banana-2.1 — Uses native Nano Banana 2.1 on Tier 1 keys, with automatic Gemini 3.1 Flash-Lite Vector Mockup fallback on Free Tier keys"
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},
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{
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id: "gemini-3-pro-image",
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@@ -88,9 +88,80 @@ export function buildNanoBananaPrompt({
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return finalPrompt;
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}
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function extractSvgBlock(text) {
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if (!text) return null;
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const match = String(text).match(/<svg[\s\S]*?<\/svg>/i);
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if (!match) return null;
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let svg = match[0];
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if (!svg.includes("xmlns=")) {
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svg = svg.replace("<svg", '<svg xmlns="http://www.w3.org/2000/svg"');
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}
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return svg;
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}
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/**
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* Free-Tier Fallback: When Google AI Studio's Free Tier blocks raster image models
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* (`limit: 0 input tokens per minute on Free Tier`), uses `gemini-3.1-flash-lite`
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* on the same API key to generate a custom, detailed multi-layer SVG product/apparel mockup!
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*/
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async function generateFreeTierSvgMockup({
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ai,
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prompt,
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referenceImagePath,
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outputDir
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}) {
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let previousSvgSnippet = "";
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if (referenceImagePath && referenceImagePath.endsWith(".svg") && fs.existsSync(referenceImagePath)) {
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previousSvgSnippet = fs.readFileSync(referenceImagePath, "utf-8").slice(0, 12000);
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}
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const svgPrompt = [
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"You are an expert apparel & product graphic designer and SVG illustrator.",
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"Generate a complete, standalone, richly detailed 800x800 SVG (`viewBox=\"0 0 800 800\"`) product mockup for the following brief:",
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`BRIEF: ${prompt}`,
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previousSvgSnippet
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? `EXISTING SVG TO EDIT/REFINE:\n${previousSvgSnippet}\nApply the requested changes while preserving or improving the overall composition.`
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: "",
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"DESIGN RULES:",
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"1. Include a sleek studio backdrop (`#121621` radial gradient).",
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"2. If the brief mentions a t-shirt, draw a realistic, well-proportioned crewneck t-shirt silhouette with collar ribbing, sleeve seams, subtle fabric shading, and the requested garment hex color. Place the custom screenprint illustration and vintage typography either full-front (`cx=400, cy=360`) or in the 5-inch left-chest pocket zone (`cx=490, cy=285`, scaled compactly) according to the brief.",
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"3. If the brief is a sticker, poster, or app UI, draw the realistic die-cut border, gallery frame, or device frame accordingly.",
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"4. Draw rich, multi-layered custom vector illustration paths, badges, emblems, stars/mountains/icons, and bold screenprint typography with high contrast against the garment/surface color.",
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"5. Return ONLY the raw `<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 800 800\">...</svg>` code block with no markdown explanation."
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]
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.filter(Boolean)
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.join("\n\n");
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const interaction = await ai.interactions.create({
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model: "gemini-3.1-flash-lite",
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input: svgPrompt
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});
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const svgContent = extractSvgBlock(interaction.output_text);
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if (!svgContent) {
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throw new Error("Free-tier fallback completed without valid SVG output.");
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}
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const filename = `nb-svg-${Date.now()}-${Math.random().toString(36).slice(2, 7)}.svg`;
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const fullPath = path.join(outputDir, filename);
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fs.mkdirSync(outputDir, { recursive: true });
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fs.writeFileSync(fullPath, svgContent, "utf-8");
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return {
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filename,
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imageUrl: `/mockups/${filename}`,
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mimeType: "image/svg+xml",
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modelUsed: "gemini-3.1-flash-lite (Free-Tier Vector Mockup)",
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interactionId: interaction.id || null,
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textNotes: "Generated via Gemini 3.1 Flash-Lite Vector Studio (Free Tier key detected; enable Tier 1 billing in Google AI Studio for raster Nano Banana 2.1)."
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};
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}
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/**
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* Generates or edits an image using Google Gemini Nano Banana (`gemini-nano-banana-2.1`)
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* via the official `@google/genai` Interactions API (`ai.interactions.create`).
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* via the official `@google/genai` Interactions API (`ai.interactions.create`),
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* with automatic fallback to `gemini-3.1-flash-lite` vector mockup generation when
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* a Free Tier key hits `limit: 0`.
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*/
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export async function generateWithNanoBanana({
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apiKey,
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@@ -104,7 +175,7 @@ export async function generateWithNanoBanana({
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const resolvedKey = apiKey || process.env.GEMINI_API_KEY || process.env.GOOGLE_API_KEY;
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if (!resolvedKey) {
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const err = new Error(
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"No Gemini API key configured. Click '⚙️ Nano Banana API Key' in the Mockup Studio (or set GEMINI_API_KEY) to generate live images with Nano Banana 2.1, or use the Interactive T-Shirt Canvas Compositor."
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"No Gemini API key configured. Click '🍌 Nano Banana' in the top bar (or set GEMINI_API_KEY) to generate live mockups, or use the Interactive T-Shirt Canvas Compositor."
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);
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err.code = "MISSING_API_KEY";
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throw err;
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@@ -117,12 +188,10 @@ export async function generateWithNanoBanana({
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const ai = new GoogleGenAI({ apiKey: resolvedKey });
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let inputPayload = prompt;
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// Check if we are performing conversational image-to-image editing
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let base64Data = referenceImageBase64;
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let mimeType = referenceMimeType || "image/png";
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if (!base64Data && referenceImagePath && fs.existsSync(referenceImagePath)) {
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if (!base64Data && referenceImagePath && fs.existsSync(referenceImagePath) && !referenceImagePath.endsWith(".svg")) {
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const bytes = fs.readFileSync(referenceImagePath);
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base64Data = bytes.toString("base64");
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if (referenceImagePath.endsWith(".jpg") || referenceImagePath.endsWith(".jpeg")) {
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@@ -131,7 +200,6 @@ export async function generateWithNanoBanana({
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}
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if (base64Data) {
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// Strip data URL prefix if present
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const cleanedBase64 = base64Data.replace(/^data:image\/[a-zA-Z0-9+.-]+;base64,/, "");
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inputPayload = [
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{ type: "text", text: prompt },
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@@ -143,32 +211,46 @@ export async function generateWithNanoBanana({
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];
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}
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const interaction = await ai.interactions.create({
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model: validModel,
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input: inputPayload
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});
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try {
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const interaction = await ai.interactions.create({
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model: validModel,
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input: inputPayload
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});
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const generatedImage = interaction.output_image;
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if (!generatedImage || !generatedImage.data) {
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throw new Error(
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interaction.output_text ||
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"Nano Banana completed the interaction without returning an image block. Try refining your visual prompt."
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);
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const generatedImage = interaction.output_image;
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if (!generatedImage || !generatedImage.data) {
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throw new Error(
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interaction.output_text ||
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"Nano Banana completed the interaction without returning an image block."
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);
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}
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const ext = (generatedImage.mime_type || "").includes("jpeg") ? "jpg" : "png";
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const filename = `nb-${Date.now()}-${Math.random().toString(36).slice(2, 7)}.${ext}`;
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const fullPath = path.join(outputDir, filename);
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fs.mkdirSync(outputDir, { recursive: true });
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fs.writeFileSync(fullPath, Buffer.from(generatedImage.data, "base64"));
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return {
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filename,
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imageUrl: `/mockups/${filename}`,
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mimeType: generatedImage.mime_type || `image/${ext}`,
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modelUsed: validModel,
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interactionId: interaction.id || null,
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textNotes: interaction.output_text || null
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};
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} catch (err) {
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const msg = String(err?.message || "");
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// If Free Tier quota is 0 for native raster image models, seamlessly fall back to Gemini 3.1 Flash-Lite SVG Vector Mockup!
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if (msg.includes("429") || msg.includes("Free Tier") || msg.includes("limit: 0") || msg.includes("quota")) {
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return await generateFreeTierSvgMockup({
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ai,
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prompt,
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referenceImagePath,
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outputDir
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});
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}
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throw err;
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}
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const ext = (generatedImage.mime_type || "").includes("jpeg") ? "jpg" : "png";
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const filename = `nb-${Date.now()}-${Math.random().toString(36).slice(2, 7)}.${ext}`;
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const fullPath = path.join(outputDir, filename);
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fs.mkdirSync(outputDir, { recursive: true });
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fs.writeFileSync(fullPath, Buffer.from(generatedImage.data, "base64"));
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return {
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filename,
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imageUrl: `/mockups/${filename}`,
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mimeType: generatedImage.mime_type || `image/${ext}`,
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modelUsed: validModel,
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interactionId: interaction.id || null,
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textNotes: interaction.output_text || null
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};
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}
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