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* Checks if the ES256k signature on passed `token` match the claimed public key
* in the payload key `public_keys`.
*
* @param {String} token encoded and signed authentication token
* @return {Boolean} Returns `true` if the signature matches the claimed public key
* @throws {Error} if `token` contains multiple public keys
* @private
* @ignore
*/
import {
c32ToB58,
decodeToken,
Json,
publicKeyToStxAddress,
TokenVerifier,
} from 'micro-stacks/crypto';
import { getAddressFromDID } from 'micro-stacks/connect';
import { fetchPrivate } from 'micro-stacks/common';
/**
* Fetches the contents of the manifest file specified in the authentication request
*
* @param {String} authRequest encoded and signed authentication request
* @return {Promise<Object|String>} Returns a `Promise` that resolves to the JSON
* object manifest file unless there's an error in which case rejects with an error
* message.
* @private
* @ignore
*/
export async function fetchAppManifest(authRequest: string): Promise<any> {
Iif (!authRequest) {
throw new Error('Invalid auth request');
}
const payload = getValidTokenPayload(authRequest);
const manifestURI = payload.manifest_uri as string;
try {
const response = await fetchPrivate(manifestURI);
const responseText = await response.text();
const responseJSON = JSON.parse(responseText);
return { ...responseJSON, manifestURI };
} catch (error) {
console.log(error);
throw new Error('Could not fetch manifest.json');
}
}
export function isSameOriginAbsoluteUrl(uri1: string, uri2: string) {
try {
const parsedUri1 = new URL(uri1);
const parsedUri2 = new URL(uri2);
const port1 =
parseInt(parsedUri1.port || '0', 10) | 0 || (parsedUri1.protocol === 'https:' ? 443 : 80);
const port2 =
parseInt(parsedUri2.port || '0', 10) | 0 || (parsedUri2.protocol === 'https:' ? 443 : 80);
const match = {
scheme: parsedUri1.protocol === parsedUri2.protocol,
hostname: parsedUri1.hostname === parsedUri2.hostname,
port: port1 === port2,
absolute:
(uri1.includes('http://') || uri1.includes('https://')) &&
(uri2.includes('http://') || uri2.includes('https://')),
};
return match.scheme && match.hostname && match.port && match.absolute;
} catch (error) {
console.log(error);
console.log('Parsing error in same URL origin check');
// Parse error
return false;
}
}
interface TokenPayload {
[key: string]: Json;
iss: string;
jti: string;
iat: string | number;
exp: string | number;
}
function getValidTokenPayload(token: string): TokenPayload {
const payload = decodeToken(token)?.payload;
Iif (!payload) throw new Error('Unexpected undefined payload of token');
Iif (typeof payload === 'string') throw new Error('Unexpected token payload type of string');
return payload as TokenPayload;
}
export function doSignaturesMatchPublicKeys(token: string): boolean {
const payload = getValidTokenPayload(token);
const publicKeys = payload.public_keys as string[];
Iif (!publicKeys || publicKeys.length === 0) throw new Error('Unexpected public keys value');
if (publicKeys.length === 1) {
const publicKey = publicKeys[0];
try {
return new TokenVerifier('ES256k', publicKey).verify(token);
} catch (e) {
return false;
}
} else E{
throw new Error('Multiple public keys are not supported');
}
}
/**
* Makes sure that the identity address portion of
* the decentralized identifier passed in the issuer `iss`
* key of the token matches the public key
*
* @param {String} token encoded and signed authentication token
* @return {Boolean} if the identity address and public keys match
* @throws {Error} if ` token` has multiple public keys
* @private
* @ignore
*/
export function doPublicKeysMatchIssuer(token: string): boolean {
const payload = getValidTokenPayload(token);
const publicKeys = payload.public_keys as string[];
Iif (!publicKeys || publicKeys.length === 0) throw new Error('Unexpected public keys value');
const addressFromIssuer = getAddressFromDID(payload.iss);
if (publicKeys.length === 1) {
const addressFromPublicKeys = publicKeyToStxAddress(publicKeys[0]);
if (addressFromPublicKeys === addressFromIssuer) {
return true;
}
} else E{
throw new Error('Multiple public keys are not supported');
}
return false;
}
/**
* Looks up the identity address that owns the claimed username
* in `token` using the lookup endpoint provided in `nameLookupURL`
* to determine if the username is owned by the identity address
* that matches the claimed public key
*
* @param {String} token encoded and signed authentication token
* @param {String} nameLookupURL a URL to the name lookup endpoint of the Blockstack Core API
* @return {Promise<Boolean>} returns a `Promise` that resolves to
* `true` if the username is owned by the public key, otherwise the
* `Promise` resolves to `false`
* @private
* @ignore
*/
export async function doPublicKeysMatchUsername(
token: string,
nameLookupURL: string
): Promise<boolean> {
try {
const payload = getValidTokenPayload(token);
Iif (!payload.username) return true;
Iif (nameLookupURL === null) return false;
const username = payload.username;
const url = `${nameLookupURL.replace(/\/$/, '')}/${username}`;
const response = await fetchPrivate(url);
const responseText = await response.text();
const responseJSON = JSON.parse(responseText);
if (responseJSON.hasOwnProperty('address')) {
const nameOwningAddress = responseJSON.address;
let nameOwningAddressBtc = nameOwningAddress;
try {
// try converting STX to BTC
// if this throws, it's already a BTC address
nameOwningAddressBtc = c32ToB58(nameOwningAddress as string);
} catch {}
const addressFromIssuer = getAddressFromDID(payload.iss);
return nameOwningAddressBtc === addressFromIssuer;
} else {
return false;
}
} catch (error) {
console.log(error);
console.log('Error checking `doPublicKeysMatchUsername`');
return false;
}
}
/**
* Checks if the if the token issuance time and date is after the
* current time and date.
*
* @param {String} token encoded and signed authentication token
* @return {Boolean} `true` if the token was issued after the current time,
* otherwise returns `false`
* @private
* @ignore
*/
export function isIssuanceDateValid(token: string) {
const payload = getValidTokenPayload(token);
if (payload.iat) {
Iif (typeof payload.iat !== 'number') return false;
const issuedAt = new Date(payload.iat * 1000); // JWT times are in seconds
return new Date().getTime() >= issuedAt.getTime();
} else E{
return true;
}
}
/**
* Checks if the expiration date of the `token` is before the current time
* @param {String} token encoded and signed authentication token
* @return {Boolean} `true` if the `token` has not yet expired, `false`
* if the `token` has expired
*
* @private
* @ignore
*/
export function isExpirationDateValid(token: string) {
const payload = getValidTokenPayload(token);
if (payload.exp) {
Iif (typeof payload.exp !== 'number') return false;
const expiresAt = new Date(payload.exp * 1000); // JWT times are in seconds
return new Date().getTime() <= expiresAt.getTime();
} else E{
return true;
}
}
/**
* Makes sure the `manifest_uri` is a same origin absolute URL.
* @param {String} token encoded and signed authentication token
* @return {Boolean} `true` if valid, otherwise `false`
* @private
* @ignore
*/
export function isManifestUriValid(token: string) {
const payload = getValidTokenPayload(token);
return isSameOriginAbsoluteUrl(payload.domain_name as string, payload.manifest_uri as string);
}
/**
* Makes sure the `redirect_uri` is a same origin absolute URL.
* @param {String} token encoded and signed authentication token
* @return {Boolean} `true` if valid, otherwise `false`
* @private
* @ignore
*/
export function isRedirectUriValid(token: string) {
const payload = getValidTokenPayload(token);
return isSameOriginAbsoluteUrl(payload.domain_name as string, payload.redirect_uri as string);
}
/**
* Verify authentication request is valid. This function performs a number
* of checks on the authentication request token:
* * Checks that `token` has a valid issuance date & is not expired
* * Checks that `token` has a valid signature that matches the public key it claims
* * Checks that both the manifest and redirect URLs are absolute and conform to
* the same origin policy
*
* @param {String} token encoded and signed authentication request token
* @return {Promise} that resolves to true if the auth request
* is valid and false if it does not. It rejects with a String if the
* token is not signed
* @private
* @ignore
*/
export async function verifyAuthRequest(token: string): Promise<boolean> {
Iif (decodeToken(token)?.header.alg === 'none') {
throw new Error('Token must be signed in order to be verified');
}
const values = await Promise.all([
isExpirationDateValid(token),
isIssuanceDateValid(token),
doSignaturesMatchPublicKeys(token),
doPublicKeysMatchIssuer(token),
isManifestUriValid(token),
isRedirectUriValid(token),
]);
return values.every(val => val);
}
/**
* Verify the authentication request is valid and
* fetch the app manifest file if valid. Otherwise, reject the promise.
* @param {String} token encoded and signed authentication request token
* @return {Promise} that resolves to the app manifest file in JSON format
* or rejects if the auth request or app manifest file is invalid
* @private
* @ignore
*/
export async function verifyAuthRequestAndLoadManifest(token: string): Promise<any> {
const valid = await verifyAuthRequest(token);
Iif (!valid) {
throw new Error('Token is an invalid auth request');
}
return fetchAppManifest(token);
}
/**
* Verify the authentication response is valid.
* @param {String} token the authentication response token
* @param {String} nameLookupURL the url use to verify owner of a username
* @param fallbackLookupURLs an optional array of name lookup URLs to check usernames for
* @return {Promise} that resolves to true if auth response
* is valid and false if it does not
* @private
* @ignore
*/
export async function verifyAuthResponse(
token: string,
nameLookupURL: string,
fallbackLookupURLs?: string[]
): Promise<boolean> {
const values = await Promise.all([
isExpirationDateValid(token),
isIssuanceDateValid(token),
doSignaturesMatchPublicKeys(token),
doPublicKeysMatchIssuer(token),
]);
const usernameMatchings = await Promise.all(
[nameLookupURL]
.concat(fallbackLookupURLs || [])
.map(url => doPublicKeysMatchUsername(token, url))
);
const someUsernameMatches = usernameMatchings.includes(true);
return someUsernameMatches && values.every(val => val);
}
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