async function callback()

in src/login/server.ts [176:201]

• 21 lines of code
• 10 McCabe index (conditional complexity)

async function callback(nonce: string, reqUrl: url.Url): Promise<string> {
	let query: ParsedUrlQuery;
	let error: string | undefined;
	let code: string | undefined;

	if (reqUrl.query) {
		query = typeof reqUrl.query === 'string' ? parse(reqUrl.query) : reqUrl.query;
		error = getQueryProp(query, 'error_description') || getQueryProp(query, 'error');
		code = getQueryProp(query, 'code');

		if (!error) {
			const state: string = getQueryProp(query, 'state');
			const receivedNonce: string = (state?.split(',')[1] || '').replace(/ /g, '+');

			if (receivedNonce !== nonce) {
				error = 'Nonce does not match.';
			}
		}
	}

	if (!error && code) {
		return code;
	}

	throw new Error(error || 'No code received.');
}