Function readSSLFile

src/config/index.ts:13–40

* Read and validate an SSL file (certificate, key, or CA) for SSL connections. * @param filePath - Path to the SSL file (PEM format) * @param label - Human-readable label for error messages (e.g. "CA certificate", "client certificate") * @returns Buffer containing the file data * @throws Error i

(filePath: string, label: string)

 * @throws Error if file doesn't exist, is empty, or cannot be read
 */
function readSSLFile(filePath: string, label: string): Buffer {
  try {
    // Check if file exists and is readable
    if (!fs.existsSync(filePath)) {
      throw new Error(`SSL ${label} file not found: ${filePath}`);
    }

    // Read the file
    const data = fs.readFileSync(filePath);

    // Basic validation - check it's not empty
    if (data.length === 0) {
      throw new Error(`SSL ${label} file is empty: ${filePath}`);
    }

    return data;
  } catch (error) {
    if (error instanceof Error) {
      // Re-throw our custom errors as-is
      if (error.message.startsWith('SSL ')) {
        throw error;
      }
      // Wrap other errors (like permission denied)
      throw new Error(`Failed to read SSL ${label}: ${error.message}`);
    }
    throw error;
  }
}

/**
 * Read and validate CA certificate file for SSL connections.