import { readFileSync, existsSync } from 'fs';
import { join } from 'path';
import { homedir } from 'os';
import { OBSIDIAN_DEFAULTS } from '../constants.js';
import { isTestEnvironment } from './environment.js';
interface ObsidianConfig {
apiKey?: string;
host?: string;
}
export class ConfigLoader {
private static instance: ConfigLoader;
private config: ObsidianConfig | null = null;
private constructor() {}
static getInstance(): ConfigLoader {
if (!ConfigLoader.instance) {
ConfigLoader.instance = new ConfigLoader();
}
return ConfigLoader.instance;
}
/**
* Load configuration with the following precedence:
* 1. Environment variables (OBSIDIAN_API_KEY, OBSIDIAN_HOST)
* 2. Config file specified by OBSIDIAN_CONFIG_FILE env var
* 3. Default config file at ~/.config/mcp/obsidian.json
*/
loadConfig(): ObsidianConfig {
if (this.config) {
return this.config;
}
// Start with environment variables
this.config = {
apiKey: process.env.OBSIDIAN_API_KEY,
host: process.env.OBSIDIAN_HOST
};
// Try to load from config file
const configFromFile = this.loadConfigFile();
if (configFromFile) {
// Config file values don't override env vars
this.config = {
apiKey: this.config.apiKey || configFromFile.apiKey,
host: this.config.host || configFromFile.host
};
}
return this.config;
}
private loadConfigFile(): ObsidianConfig | null {
// Check for custom config file path
const customPath = process.env.OBSIDIAN_CONFIG_FILE;
if (customPath) {
return this.readConfigFile(customPath);
}
// Check default location
const defaultPath = join(homedir(), '.config', 'mcp', 'obsidian.json');
return this.readConfigFile(defaultPath);
}
private readConfigFile(path: string): ObsidianConfig | null {
try {
if (!existsSync(path)) {
return null;
}
const content = readFileSync(path, 'utf-8');
const config = JSON.parse(content);
// Validate config structure
if (typeof config !== 'object') {
// Only log config errors in non-test environments to avoid confusing test output
if (!isTestEnvironment()) {
console.warn(`Invalid config file at ${path}: not an object`);
}
return null;
}
// Extract only the fields we care about
const result: ObsidianConfig = {};
if (typeof config.apiKey === 'string') {
result.apiKey = config.apiKey;
}
if (typeof config.host === 'string') {
result.host = config.host;
}
return result;
} catch (error) {
// Only log config errors in non-test environments to avoid confusing test output
if (!isTestEnvironment()) {
console.warn(`Failed to read config file at ${path}:`, error);
}
return null;
}
}
getApiKey(): string {
const config = this.loadConfig();
if (!config.apiKey) {
throw new Error(
'OBSIDIAN_API_KEY not found. Please provide it via:\n' +
'1. OBSIDIAN_API_KEY environment variable\n' +
'2. Config file at ~/.config/mcp/obsidian.json\n' +
'3. Custom config file via OBSIDIAN_CONFIG_FILE environment variable'
);
}
return config.apiKey;
}
getHost(): string {
const config = this.loadConfig();
return config.host || OBSIDIAN_DEFAULTS.HOST;
}
// For testing
reset(): void {
this.config = null;
}
}
