Add server-side configuration utility

Author: AnotiaWang

server/utils/config.ts

@@ -0,0 +1,122 @@
+import type { Config, ConfigAi, ConfigWebSearch } from '~/app/stores/config'
+
+/**
+ * Server-side configuration loaded from environment variables
+ */
+export interface ServerConfig {
+  /** Whether the server has valid AI configuration */
+  hasAiConfig: boolean
+  /** Whether the server has valid web search configuration */
+  hasWebSearchConfig: boolean
+  /** The AI configuration from environment variables */
+  ai: ConfigAi
+  /** The web search configuration from environment variables */
+  webSearch: ConfigWebSearch
+}
+
+/**
+ * Read environment variables for AI configuration
+ */
+function getAiConfig(): ConfigAi {
+  const provider = process.env.AI_PROVIDER as ConfigAi['provider'] || 'openai-compatible'
+  const apiKey = process.env.AI_API_KEY || ''
+  const apiBase = process.env.AI_API_BASE || ''
+  const model = process.env.AI_MODEL || ''
+  const contextSize = process.env.AI_CONTEXT_SIZE 
+    ? parseInt(process.env.AI_CONTEXT_SIZE, 10) 
+    : 128_000
+
+  return {
+    provider,
+    apiKey,
+    apiBase,
+    model,
+    contextSize
+  }
+}
+
+/**
+ * Read environment variables for web search configuration
+ */
+function getWebSearchConfig(): ConfigWebSearch {
+  const provider = process.env.WEB_SEARCH_PROVIDER as ConfigWebSearch['provider'] || 'tavily'
+  const apiKey = process.env.WEB_SEARCH_API_KEY || ''
+  const apiBase = process.env.WEB_SEARCH_API_BASE || ''
+  const searchLanguage = process.env.WEB_SEARCH_LANGUAGE as ConfigWebSearch['searchLanguage']
+  const concurrencyLimit = process.env.WEB_SEARCH_CONCURRENCY_LIMIT 
+    ? parseInt(process.env.WEB_SEARCH_CONCURRENCY_LIMIT, 10) 
+    : 2
+  
+  // Tavily specific config
+  const tavilyAdvancedSearch = process.env.TAVILY_ADVANCED_SEARCH === 'true'
+  const tavilySearchTopic = process.env.TAVILY_SEARCH_TOPIC as ConfigWebSearch['tavilySearchTopic'] || 'general'
+
+  return {
+    provider,
+    apiKey,
+    apiBase,
+    searchLanguage,
+    concurrencyLimit,
+    tavilyAdvancedSearch,
+    tavilySearchTopic
+  }
+}
+
+/**
+ * Validate AI configuration
+ */
+function validateAiConfig(config: ConfigAi): boolean {
+  if (config.provider !== 'ollama' && !config.apiKey) return false
+  if (typeof config.contextSize !== 'undefined' && config.contextSize < 0) return false
+  if (!config.model) return false
+  return true
+}
+
+/**
+ * Validate web search configuration
+ */
+function validateWebSearchConfig(config: ConfigWebSearch): boolean {
+  if (config.provider === 'tavily' && !config.apiKey) return false
+  // Either apiBase or apiKey is required for firecrawl
+  if (config.provider === 'firecrawl' && !config.apiBase && !config.apiKey) return false
+  if (typeof config.concurrencyLimit !== 'undefined' && config.concurrencyLimit! < 1) return false
+  return true
+}
+
+/**
+ * Get the server-side configuration from environment variables
+ */
+export function getServerConfig(): ServerConfig {
+  const ai = getAiConfig()
+  const webSearch = getWebSearchConfig()
+  
+  const hasAiConfig = validateAiConfig(ai)
+  const hasWebSearchConfig = validateWebSearchConfig(webSearch)
+  
+  return {
+    hasAiConfig,
+    hasWebSearchConfig,
+    ai,
+    webSearch
+  }
+}
+
+/**
+ * Get the full configuration, combining server and client config.
+ * Client config takes precedence when provided.
+ */
+export function getMergedConfig(clientConfig?: Config): Config {
+  const serverConfig = getServerConfig()
+  
+  if (!clientConfig) {
+    return {
+      ai: serverConfig.ai,
+      webSearch: serverConfig.webSearch
+    }
+  }
+  
+  return {
+    ai: clientConfig.ai || serverConfig.ai,
+    webSearch: clientConfig.webSearch || serverConfig.webSearch
+  }
+}