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fix: auto-detect AI provider from configured API keys (#74)

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- Remove default bedrock provider requirement
- Auto-detect provider when only one API key is configured
- Show helpful error when no keys or multiple keys without AI_PROVIDER
- Fixes #73
This commit is contained in:
Dayuan Jiang
2025-12-04 14:13:10 +09:00
committed by GitHub
parent 489b377063
commit 5f4d31e708
1 changed files with 73 additions and 13 deletions
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74
lib/ai-providers.ts
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@@ -36,11 +36,8 @@ const ANTHROPIC_BETA_HEADERS = {
'anthropic-beta': 'fine-grained-tool-streaming-2025-05-14',
};
/**
* Validate that required API keys are present for the selected provider
*/
function validateProviderCredentials(provider: ProviderName): void {
const requiredEnvVars: Record<ProviderName, string | null> = {
// Map of provider to required environment variable
const PROVIDER_ENV_VARS: Record<ProviderName, string | null> = {
bedrock: 'AWS_ACCESS_KEY_ID',
openai: 'OPENAI_API_KEY',
anthropic: 'ANTHROPIC_API_KEY',
@@ -51,7 +48,35 @@ function validateProviderCredentials(provider: ProviderName): void {
deepseek: 'DEEPSEEK_API_KEY',
};
const requiredVar = requiredEnvVars[provider];
/**
* Auto-detect provider based on available API keys
* Returns the provider if exactly one is configured, otherwise null
*/
function detectProvider(): ProviderName | null {
const configuredProviders: ProviderName[] = [];
for (const [provider, envVar] of Object.entries(PROVIDER_ENV_VARS)) {
if (envVar === null) {
// Skip ollama - it doesn't require credentials
continue;
}
if (process.env[envVar]) {
configuredProviders.push(provider as ProviderName);
}
}
if (configuredProviders.length === 1) {
return configuredProviders[0];
}
return null;
}
/**
* Validate that required API keys are present for the selected provider
*/
function validateProviderCredentials(provider: ProviderName): void {
const requiredVar = PROVIDER_ENV_VARS[provider];
if (requiredVar && !process.env[requiredVar]) {
throw new Error(
`${requiredVar} environment variable is required for ${provider} provider. ` +
@@ -80,7 +105,6 @@ function validateProviderCredentials(provider: ProviderName): void {
* - DEEPSEEK_BASE_URL: DeepSeek endpoint (optional)
*/
export function getAIModel(): ModelConfig {
const provider = (process.env.AI_PROVIDER || 'bedrock') as ProviderName;
const modelId = process.env.AI_MODEL;
if (!modelId) {
@@ -89,6 +113,42 @@ export function getAIModel(): ModelConfig {
);
}
// Determine provider: explicit config > auto-detect > error
let provider: ProviderName;
if (process.env.AI_PROVIDER) {
provider = process.env.AI_PROVIDER as ProviderName;
} else {
const detected = detectProvider();
if (detected) {
provider = detected;
console.log(`[AI Provider] Auto-detected provider: ${provider}`);
} else {
// List configured providers for better error message
const configured = Object.entries(PROVIDER_ENV_VARS)
.filter(([, envVar]) => envVar && process.env[envVar as string])
.map(([p]) => p);
if (configured.length === 0) {
throw new Error(
`No AI provider configured. Please set one of the following API keys in your .env.local file:\n` +
`- DEEPSEEK_API_KEY for DeepSeek\n` +
`- OPENAI_API_KEY for OpenAI\n` +
`- ANTHROPIC_API_KEY for Anthropic\n` +
`- GOOGLE_GENERATIVE_AI_API_KEY for Google\n` +
`- AWS_ACCESS_KEY_ID for Bedrock\n` +
`- OPENROUTER_API_KEY for OpenRouter\n` +
`- AZURE_API_KEY for Azure\n` +
`Or set AI_PROVIDER=ollama for local Ollama.`
);
} else {
throw new Error(
`Multiple AI providers configured (${configured.join(', ')}). ` +
`Please set AI_PROVIDER to specify which one to use.`
);
}
}
}
// Validate provider credentials
validateProviderCredentials(provider);