const { subtle } = require('node:crypto').webcrypto;
const authentication = require('../src/authentication');

describe('authentication module', () => {
    describe('verifySignature', () => {
        it('should return the public key if the signature is verified successfully', async () => {
            const { publicKey, privateKey } = await crypto.subtle.generateKey(
                {
                    name: "Ed25519",
                },
                true,
                ["sign", "verify"],
            );
            const exportedPubkey = await crypto.subtle.exportKey("spki", publicKey);
            let exportedAsString = String.fromCharCode.apply(null, new Uint8Array(exportedPubkey));
            let exportedAsBase64 = Buffer.from(exportedAsString, 'binary').toString('base64');
            let pemKey = `-----BEGIN PUBLIC KEY-----\n${exportedAsBase64}\n-----END PUBLIC KEY-----`;
            const publicKeys = [pemKey,];
            const msg = 'test message';
            const encoder = new TextEncoder();
            const encodedData = encoder.encode(msg);
            const signature = await crypto.subtle.sign(
                {
                    name: "Ed25519",
                },
                privateKey,
                encodedData,
            );
            const result = await authentication.verifySignature(encodedData, signature, publicKeys);
            expect(result).toBe(pemKey);

            let fakeKey = `-----BEGIN PUBLIC KEY-----MCowBQYDK2VwAyEAmrBLT6lyiFh/eUticsIFNY6AkjXuQPqj0Qvb99pCJJk=-----END PUBLIC KEY-----`
            const result2 = await authentication.verifySignature(encodedData, signature, [fakeKey,]);
            expect(result2).toBe(null);
        });
    });
});