[Duplicate Code] Google API-key provider adapters repeat the same scaffold

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Duplicate Code Opportunity

Summary

• Pattern: containers/api-proxy/providers/gemini.js and containers/api-proxy/providers/vertex.js are one-line wrappers around the same makeGoogleProviderFactory() scaffold in google-adapter.js, while google-adapter.js itself duplicates the same Google API-key adapter setup across provider specs.
• Locations: containers/api-proxy/providers/google-adapter.js:36-139, containers/api-proxy/providers/gemini.js:18-29, containers/api-proxy/providers/vertex.js:18-31
• Impact: Consolidates repeated adapter plumbing for a security-critical auth/target path and reduces the chance of Gemini/Vertex drifting on headers, validation, or port behavior.

Evidence

containers/api-proxy/providers/gemini.js

const { makeGoogleProviderFactory } = require('./google-adapter');
const createGeminiAdapter = makeGoogleProviderFactory('gemini');
module.exports = { createGeminiAdapter };

containers/api-proxy/providers/vertex.js

const { makeGoogleProviderFactory } = require('./google-adapter');
const createVertexAdapter = makeGoogleProviderFactory('vertex');
module.exports = { createVertexAdapter };

containers/api-proxy/providers/google-adapter.js

function createGoogleApiKeyAdapter(env, deps = {}, opts) {
  const { apiKey, rawTarget, basePath, bodyTransform } = createProviderAuthScaffold(env, deps, {
    keyEnvVar: envConstants.KEY,
    targetEnvVar: envConstants.TARGET,
    basePathEnvVar: envConstants.BASE_PATH,
    defaultTarget,
  });
  const buildAuthHeaders = () => providerKeyHeaders('x-goog-api-key', apiKey);

  const adapterMethods = createAdapterMethods({
    apiKey,
    rawTarget,
    basePath,
    provider: name,
    port,
    defaultTarget,
    validationPath,
    validationHeaders: buildAuthHeaders,
    modelsPath,
    modelsFetchHeaders: modelsPath ? buildAuthHeaders : null,
  });

  return buildProviderAdapter({
    name,
    port,
    isManagementPort: false,
    adapterMethods,
    getAuthHeaders() {
      return buildAuthHeaders();
    },
    bodyTransform,
    isEnabled() { return !!apiKey; },
    ...(transformRequestUrl !== undefined ? { transformRequestUrl } : {}),
    getUnconfiguredResponse() {
      return { statusCode: 503, body: { error: unconfiguredErrorMessage } };
    },
    getUnconfiguredHealthResponse() {
      return makeUnconfiguredHealthResponse(healthServiceName, healthErrorMessage);
    },
  });
}

Suggested Refactoring

• Collapse the Gemini/Vertex wrappers into a single declarative registry in google-provider-specs.js plus a small exported map of adapter factories.
• If the wrappers remain, generate them from a shared helper so the provider-specific files are just config entries, not repeated factory calls.

Affected Files

• containers/api-proxy/providers/google-adapter.js — lines 36-139
• containers/api-proxy/providers/gemini.js — lines 18-29
• containers/api-proxy/providers/vertex.js — lines 18-31

Effort Estimate

Low

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Detected by Duplicate Code Detector workflow. Run date: 2026-09-01

Generated by Duplicate Code Detector · copilot · gpt54mini · 5.73 AIC · ⊞ 25.7K · ◷

• expires on Oct 1, 2026, 9:43 PM UTC