From 252bf56a9fc60b703d97267d5b8621e1be1466e8 Mon Sep 17 00:00:00 2001
From: decolua <decoluadt@example.com>
Date: Sat, 13 Jun 2026 21:23:32 +0700
Subject: [PATCH] =?UTF-8?q?refactor(translator):=20P4=20concern=20#2=20enc?=
 =?UTF-8?q?odeDataUri=20=E2=80=94=20dedupe=20base64=20data-uri=20building?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- imageHelper.encodeDataUri(mime, base64) replaces 5 inline `data:${m};base64,${d}` templates
- Applied to gemini/claude/antigravity request + gemini response translators
- Golden tests pass, identical output

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 open-sse/translator/helpers/imageHelper.js           | 5 +++++
 open-sse/translator/request/antigravity-to-openai.js | 3 ++-
 open-sse/translator/request/claude-to-openai.js      | 3 ++-
 open-sse/translator/request/gemini-to-openai.js      | 3 ++-
 open-sse/translator/response/gemini-to-openai.js     | 3 ++-
 5 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/open-sse/translator/helpers/imageHelper.js b/open-sse/translator/helpers/imageHelper.js
index 1df04d8d..f4288dd4 100644
--- a/open-sse/translator/helpers/imageHelper.js
+++ b/open-sse/translator/helpers/imageHelper.js
@@ -1,3 +1,8 @@
+// Build a base64 data URI from mime + base64 payload
+export function encodeDataUri(mimeType, base64) {
+  return `data:${mimeType};base64,${base64}`;
+}
+
 /**
  * Fetch a remote image URL and return it as a base64 data URI.
  * Used when upstream providers (Codex, etc.) require inline base64 images
diff --git a/open-sse/translator/request/antigravity-to-openai.js b/open-sse/translator/request/antigravity-to-openai.js
index 9a3b5d21..8cd239e4 100644
--- a/open-sse/translator/request/antigravity-to-openai.js
+++ b/open-sse/translator/request/antigravity-to-openai.js
@@ -1,6 +1,7 @@
 import { register } from "../index.js";
 import { FORMATS } from "../formats.js";
 import { adjustMaxTokens } from "../helpers/maxTokensHelper.js";
+import { encodeDataUri } from "../helpers/imageHelper.js";
 
 // Convert Antigravity request to OpenAI format
 // Antigravity body: { project, model, userAgent, requestType, requestId, request: { contents, systemInstruction, tools, toolConfig, generationConfig, sessionId } }
@@ -156,7 +157,7 @@ function convertContent(content) {
       textParts.push({
         type: "image_url",
         image_url: {
-          url: `data:${part.inlineData.mimeType};base64,${part.inlineData.data}`
+          url: encodeDataUri(part.inlineData.mimeType, part.inlineData.data)
         }
       });
     }
diff --git a/open-sse/translator/request/claude-to-openai.js b/open-sse/translator/request/claude-to-openai.js
index 0f8e7bb5..97f6db5f 100644
--- a/open-sse/translator/request/claude-to-openai.js
+++ b/open-sse/translator/request/claude-to-openai.js
@@ -1,6 +1,7 @@
 import { register } from "../index.js";
 import { FORMATS } from "../formats.js";
 import { adjustMaxTokens } from "../helpers/maxTokensHelper.js";
+import { encodeDataUri } from "../helpers/imageHelper.js";
 
 function stripAnthropicBillingHeader(text) {
   if (typeof text !== "string") return "";
@@ -140,7 +141,7 @@ function convertClaudeMessage(msg) {
             parts.push({
               type: "image_url",
               image_url: {
-                url: `data:${block.source.media_type};base64,${block.source.data}`
+                url: encodeDataUri(block.source.media_type, block.source.data)
               }
             });
           }
diff --git a/open-sse/translator/request/gemini-to-openai.js b/open-sse/translator/request/gemini-to-openai.js
index 5b3d0f01..4cff05bd 100644
--- a/open-sse/translator/request/gemini-to-openai.js
+++ b/open-sse/translator/request/gemini-to-openai.js
@@ -1,6 +1,7 @@
 import { register } from "../index.js";
 import { FORMATS } from "../formats.js";
 import { adjustMaxTokens } from "../helpers/maxTokensHelper.js";
+import { encodeDataUri } from "../helpers/imageHelper.js";
 
 // Convert Gemini request to OpenAI format
 export function geminiToOpenAIRequest(model, body, stream) {
@@ -88,7 +89,7 @@ function convertGeminiContent(content) {
       parts.push({
         type: "image_url",
         image_url: {
-          url: `data:${part.inlineData.mimeType};base64,${part.inlineData.data}`
+          url: encodeDataUri(part.inlineData.mimeType, part.inlineData.data)
         }
       });
     }
diff --git a/open-sse/translator/response/gemini-to-openai.js b/open-sse/translator/response/gemini-to-openai.js
index f7161d28..2a5d670c 100644
--- a/open-sse/translator/response/gemini-to-openai.js
+++ b/open-sse/translator/response/gemini-to-openai.js
@@ -3,6 +3,7 @@ import { FORMATS } from "../formats.js";
 import { buildChunk } from "../helpers/chunkBuilder.js";
 import { buildUsage } from "../helpers/usageHelper.js";
 import { reasoningDelta } from "../helpers/reasoningHelper.js";
+import { encodeDataUri } from "../helpers/imageHelper.js";
 
 // Build chunk meta for current gemini state
 function chunkMeta(state) {
@@ -116,7 +117,7 @@ export function geminiToOpenAIResponse(chunk, state) {
           {
             images: [{
               type: "image_url",
-              image_url: { url: `data:${mimeType};base64,${inlineData.data}` }
+              image_url: { url: encodeDataUri(mimeType, inlineData.data) }
             }]
           },
           null