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fix: use correct Gemini image generation model and API 

Replace deprecated Imagen 3 and RunPod proxy with direct Gemini
2.0 Flash Image Generation API call. Removes unused model functions
and simplifies the image generation flow.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Jeff Emmett 2025-12-23 15:05:26 -05:00
parent fd6f16f299
commit e011fb0c46
1 changed files with 22 additions and 106 deletions
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128
app/api/zine/generate-page/route.ts
View File

@ -102,35 +102,20 @@ async function generateImageWithGemini(
style: string
): Promise<string> {
const apiKey = process.env.GEMINI_API_KEY;
const runpodApiKey = process.env.RUNPOD_API_KEY;
const runpodEndpointId = process.env.RUNPOD_GEMINI_ENDPOINT_ID || "ntqjz8cdsth42i";
if (!apiKey) {
throw new Error("GEMINI_API_KEY not configured");
}
// Try Imagen 3 first (best quality, may work directly)
// Try Gemini 2.5 Flash Image (Nano Banana) - the correct image generation model
try {
const result = await generateWithImagen3(prompt, apiKey);
const result = await generateWithGeminiNanoBanana(prompt, apiKey);
if (result) {
console.log("✅ Generated image with Imagen 3");
console.log("✅ Generated image with Gemini 2.5 Flash Image (Nano Banana)");
return result;
}
} catch (error) {
console.error("Imagen 3 error:", error);
}
// Fallback to Gemini via RunPod proxy
if (runpodApiKey) {
try {
const result = await generateWithRunPodGeminiProxy(prompt, apiKey, runpodApiKey, runpodEndpointId);
if (result) {
console.log("✅ Generated image with Gemini via RunPod proxy");
return result;
}
} catch (error) {
console.error("RunPod Gemini proxy error:", error);
}
console.error("Gemini Nano Banana error:", error);
}
// Final fallback: Create styled placeholder
@ -138,108 +123,39 @@ async function generateImageWithGemini(
return createStyledPlaceholder(outline, style);
}
// Imagen 3 - Google's best image generation model
async function generateWithImagen3(prompt: string, apiKey: string): Promise<string | null> {
const imagenUrl = `https://generativelanguage.googleapis.com/v1beta/models/imagen-3.0-generate-002:predict?key=${apiKey}`;
// Gemini 2.5 Flash Image (Nano Banana) - Google's image generation model
async function generateWithGeminiNanoBanana(prompt: string, apiKey: string): Promise<string | null> {
const apiUrl = `https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp-image-generation:generateContent?key=${apiKey}`;
console.log("Calling Imagen 3 API...");
console.log("Calling Gemini 2.0 Flash Image Generation API...");
const response = await fetch(imagenUrl, {
const response = await fetch(apiUrl, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
instances: [{ prompt: prompt }],
parameters: {
sampleCount: 1,
aspectRatio: "3:4", // Portrait for zine pages
safetyFilterLevel: "BLOCK_ONLY_HIGH",
personGeneration: "ALLOW_ALL",
},
contents: [
{
parts: [
{ text: prompt }
]
}
],
generationConfig: {
responseModalities: ["IMAGE", "TEXT"],
}
}),
});
if (!response.ok) {
const errorText = await response.text();
console.error("Imagen 3 API error:", response.status, errorText);
console.error("Gemini Image API error:", response.status, errorText);
return null;
}
const data = await response.json();
if (data.error) {
console.error("Imagen 3 error:", JSON.stringify(data.error));
return null;
}
// Extract image from predictions
const predictions = data.predictions || [];
if (predictions.length > 0 && predictions[0].bytesBase64Encoded) {
console.log("✅ Successfully received image from Imagen 3");
return predictions[0].bytesBase64Encoded;
}
console.error("No image in Imagen 3 response");
return null;
}
// Gemini image generation via RunPod US proxy (bypasses geo-restrictions)
// Uses gemini-2.0-flash-exp-image-generation for best quality with text rendering
async function generateWithRunPodGeminiProxy(
prompt: string,
apiKey: string,
runpodApiKey: string,
endpointId: string
): Promise<string | null> {
const runpodUrl = `https://api.runpod.ai/v2/${endpointId}/runsync`;
// Enhanced prompt for better text rendering
const enhancedPrompt = `${prompt}
CRITICAL TEXT RENDERING INSTRUCTIONS:
- Any text in the image must be spelled correctly and legibly
- Use clean, readable typography appropriate to the style
- Avoid distorted or warped letters
- Text should be integrated naturally into the design`;
console.log("Calling Gemini (gemini-2.0-flash-exp-image-generation) via RunPod proxy...");
const response = await fetch(runpodUrl, {
method: "POST",
headers: {
"Content-Type": "application/json",
"Authorization": `Bearer ${runpodApiKey}`,
},
body: JSON.stringify({
input: {
api_key: apiKey,
model: "gemini-2.0-flash-exp-image-generation",
contents: [
{
parts: [
{
text: enhancedPrompt,
},
],
},
],
generationConfig: {
responseModalities: ["IMAGE"],
},
},
}),
});
if (!response.ok) {
const errorText = await response.text();
console.error("RunPod API error:", response.status, errorText);
return null;
}
const result = await response.json();
const data = result.output || result;
if (data.error) {
console.error("Gemini API error via RunPod:", JSON.stringify(data.error));
console.error("Gemini Image error:", JSON.stringify(data.error));
return null;
}
@ -247,7 +163,7 @@ CRITICAL TEXT RENDERING INSTRUCTIONS:
const parts = data.candidates?.[0]?.content?.parts || [];
for (const part of parts) {
if (part.inlineData?.mimeType?.startsWith("image/")) {
console.log("✅ Successfully received image from Gemini via RunPod");
console.log("✅ Successfully received image from Gemini Image API");
return part.inlineData.data;
}
}