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import { Agent as HttpsAgent } from 'https';
import * as path from 'path';
import axios from 'axios';
import { Injectable, Logger } from '@nestjs/common';
import { Config, FullConfig, OptionsV2 } from './types';
@Injectable()
export class ConfigService {
private readonly logger = new Logger(ConfigService.name);
private config: Config | null = null;
async load(configPath: string, insecure = false): Promise<Config> {
let fullConfig: FullConfig;
// Check if configPath is a URL
if (configPath.startsWith('http://') || configPath.startsWith('https://')) {
this.logger.log(`Loading config from URL: ${ configPath }`);
const axiosOptions = insecure ?
{ httpsAgent: new HttpsAgent({ rejectUnauthorized: false }) } :
{};
const response = await axios.get<FullConfig>(configPath, axiosOptions);
fullConfig = response.data;
} else {
// Load from file
const absolutePath = path.isAbsolute(configPath) ?
configPath :
path.join(process.cwd(), configPath);
this.logger.log(`Loading config from file: ${ absolutePath }`);
const fileContent = fs.readFileSync(absolutePath, 'utf-8');
fullConfig = JSON.parse(fileContent);
}
// Adapt V1 to V2 if needed (placeholder for now)
// TODO: Implement V1 to V2 adaptation if needed
// Validate and expand environment variables
if (!fullConfig.mcpProxy) {
throw new Error('mcpProxy is required');
}
if (!fullConfig.mcpProxy.options) {
fullConfig.mcpProxy.options = {};
}
// Expand environment variables in headers
if (fullConfig.mcpServers) {
for (const [ _clientName, clientConfig ] of Object.entries(
fullConfig.mcpServers
)) {
if (clientConfig.headers) {
this.expandEnvVarsInHeaders(clientConfig.headers);
}
}
}
// Inherit options from mcpProxy to mcpServers
if (fullConfig.mcpServers) {
for (const clientConfig of Object.values(fullConfig.mcpServers)) {
if (!clientConfig.options) {
clientConfig.options = {};
}
this.inheritOptions(fullConfig.mcpProxy.options!, clientConfig.options);
}
}
// Set default server type to streamable-http (modern MCP standard)
if (!fullConfig.mcpProxy.type) {
fullConfig.mcpProxy.type = 'streamable-http';
}
this.config = {
mcpProxy: fullConfig.mcpProxy,
mcpServers: fullConfig.mcpServers || {}
};
return this.config;
}
getConfig(): Config {
if (!this.config) {
throw new Error('Config not loaded');
}
return this.config;
}
private expandEnvVarsInHeaders(headers: Record<string, string>): void {
const envVarPattern = /\$\{([A-Za-z_][A-Za-z0-9_]*)\}/g;
for (const [ key, value ] of Object.entries(headers)) {
if (envVarPattern.test(value)) {
const expanded = value.replace(envVarPattern, (_m, varName) => {
const envValue = process.env[varName];
if (typeof envValue === 'undefined') {
throw new Error([
'Environment variable ',
varName,
' referenced in header ',
key,
' is not set'
].join(''));
}
return envValue;
});
headers[key] = expanded;
}
}
}
private inheritOptions(parent: OptionsV2, child: OptionsV2): void {
if (child.authTokens === undefined && parent.authTokens) {
child.authTokens = parent.authTokens;
}
if (
child.panicIfInvalid === undefined &&
parent.panicIfInvalid !== undefined
) {
child.panicIfInvalid = parent.panicIfInvalid;
}
if (child.logEnabled === undefined && parent.logEnabled !== undefined) {
child.logEnabled = parent.logEnabled;
}
// NOTE: Redaction is intentionally NOT inherited from mcpProxy options
}
}
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