113 lines
3.5 KiB
TypeScript
113 lines
3.5 KiB
TypeScript
const DEFAULT_PORT = 3000;
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const DEFAULT_TBANK_RATE_LIMIT_PER_SECOND = 5;
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const MAX_PORT = 65_535;
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const MIN_JWT_SECRET_LENGTH = 32;
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const TOKEN_KEY_BYTES = 32;
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export interface Environment {
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DATABASE_URL: string;
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FRONTEND_ORIGIN: string;
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JWT_SECRET: string;
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PORT: number;
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TOKEN_ENCRYPTION_KEY: string;
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TBANK_CA_CERT_PATH?: string;
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TBANK_GRPC_ENDPOINT: string;
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TBANK_RATE_LIMIT_PER_SECOND: number;
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LOG_LEVEL: 'debug' | 'info' | 'warn' | 'error';
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}
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export function validateEnv(config: Record<string, unknown>): Environment {
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const databaseUrl = config['DATABASE_URL'];
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const frontendOrigin = config['FRONTEND_ORIGIN'];
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const port = config['PORT'] ?? DEFAULT_PORT;
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const jwtSecret = config['JWT_SECRET'];
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const tokenEncryptionKey = config['TOKEN_ENCRYPTION_KEY'];
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const tbankEndpoint =
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config['TBANK_GRPC_ENDPOINT'] ?? 'invest-public-api.tbank.ru:443';
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const tbankRateLimit =
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config['TBANK_RATE_LIMIT_PER_SECOND'] ??
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DEFAULT_TBANK_RATE_LIMIT_PER_SECOND;
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const tbankCaCertPath = config['TBANK_CA_CERT_PATH'];
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const logLevel = config['LOG_LEVEL'] ?? 'info';
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if (typeof databaseUrl !== 'string' || !databaseUrl.startsWith('file:')) {
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throw new Error('DATABASE_URL must be a SQLite file URL');
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}
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if (typeof frontendOrigin !== 'string') {
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throw new Error('FRONTEND_ORIGIN must be a valid HTTP origin');
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}
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let parsedOrigin: URL;
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try {
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parsedOrigin = new URL(frontendOrigin);
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} catch {
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throw new Error('FRONTEND_ORIGIN must be a valid HTTP origin');
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}
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if (
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(parsedOrigin.protocol !== 'http:' && parsedOrigin.protocol !== 'https:') ||
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parsedOrigin.pathname !== '/' ||
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parsedOrigin.search ||
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parsedOrigin.hash
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) {
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throw new Error('FRONTEND_ORIGIN must be a valid HTTP origin');
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}
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const parsedPort = Number(port);
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if (
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!Number.isInteger(parsedPort) ||
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parsedPort < 1 ||
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parsedPort > MAX_PORT
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) {
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throw new Error('PORT must be a valid port number');
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}
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if (
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typeof jwtSecret !== 'string' ||
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jwtSecret.length < MIN_JWT_SECRET_LENGTH
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) {
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throw new Error('JWT_SECRET must be at least 32 characters long');
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}
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if (
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typeof tokenEncryptionKey !== 'string' ||
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!/^[A-Za-z0-9+/]+={0,2}$/.test(tokenEncryptionKey) ||
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Buffer.from(tokenEncryptionKey, 'base64').length !== TOKEN_KEY_BYTES
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) {
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throw new Error(
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'TOKEN_ENCRYPTION_KEY must be a base64-encoded 32-byte key',
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);
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}
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if (typeof tbankEndpoint !== 'string' || !tbankEndpoint) {
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throw new Error('TBANK_GRPC_ENDPOINT must be a non-empty endpoint');
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}
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const parsedTbankRateLimit = Number(tbankRateLimit);
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if (!Number.isInteger(parsedTbankRateLimit) || parsedTbankRateLimit < 1) {
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throw new Error('TBANK_RATE_LIMIT_PER_SECOND must be a positive integer');
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}
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if (tbankCaCertPath !== undefined && typeof tbankCaCertPath !== 'string') {
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throw new Error('TBANK_CA_CERT_PATH must be a file path');
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}
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if (!['debug', 'info', 'warn', 'error'].includes(logLevel as string)) {
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throw new Error('LOG_LEVEL must be debug, info, warn, or error');
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}
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return {
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DATABASE_URL: databaseUrl,
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FRONTEND_ORIGIN: parsedOrigin.origin,
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JWT_SECRET: jwtSecret,
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PORT: parsedPort,
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TOKEN_ENCRYPTION_KEY: tokenEncryptionKey,
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...(typeof tbankCaCertPath === 'string' && tbankCaCertPath
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? { TBANK_CA_CERT_PATH: tbankCaCertPath }
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: {}),
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TBANK_GRPC_ENDPOINT: tbankEndpoint,
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TBANK_RATE_LIMIT_PER_SECOND: parsedTbankRateLimit,
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LOG_LEVEL: logLevel as Environment['LOG_LEVEL'],
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};
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}
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