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Просмотр файла: delegation.js
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
if (kind === "m") throw new TypeError("Private method is not writable");
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
};
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
};
var __rest = (this && this.__rest) || function (s, e) {
var t = {};
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
t[p] = s[p];
if (s != null && typeof Object.getOwnPropertySymbols === "function")
for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
t[p[i]] = s[p[i]];
}
return t;
};
var _PartialDelegationIdentity_delegation;
import { fromHex, requestIdOf, SignIdentity, toHex, } from '@dfinity/agent';
import { Principal } from '@dfinity/principal';
import * as cbor from 'simple-cbor';
import { PartialIdentity } from './partial';
import { bufFromBufLike } from '@dfinity/candid';
const domainSeparator = new TextEncoder().encode('\x1Aic-request-auth-delegation');
const requestDomainSeparator = new TextEncoder().encode('\x0Aic-request');
function _parseBlob(value) {
if (typeof value !== 'string' || value.length < 64) {
throw new Error('Invalid public key.');
}
return fromHex(value);
}
/**
* A single delegation object that is signed by a private key. This is constructed by
* `DelegationChain.create()`.
*
* {@see DelegationChain}
*/
export class Delegation {
constructor(pubkey, expiration, targets) {
this.pubkey = pubkey;
this.expiration = expiration;
this.targets = targets;
}
toCBOR() {
// Expiration field needs to be encoded as a u64 specifically.
return cbor.value.map(Object.assign({ pubkey: cbor.value.bytes(this.pubkey), expiration: cbor.value.u64(this.expiration.toString(16), 16) }, (this.targets && {
targets: cbor.value.array(this.targets.map(t => cbor.value.bytes(bufFromBufLike(t.toUint8Array())))),
})));
}
toJSON() {
// every string should be hex and once-de-hexed,
// discoverable what it is (e.g. de-hex to get JSON with a 'type' property, or de-hex to DER
// with an OID). After de-hex, if it's not obvious what it is, it's an ArrayBuffer.
return Object.assign({ expiration: this.expiration.toString(16), pubkey: toHex(this.pubkey) }, (this.targets && { targets: this.targets.map(p => p.toHex()) }));
}
}
/**
* Sign a single delegation object for a period of time.
* @param from The identity that lends its delegation.
* @param to The identity that receives the delegation.
* @param expiration An expiration date for this delegation.
* @param targets Limit this delegation to the target principals.
*/
async function _createSingleDelegation(from, to, expiration, targets) {
const delegation = new Delegation(to.toDer(), BigInt(+expiration) * BigInt(1000000), // In nanoseconds.
targets);
// The signature is calculated by signing the concatenation of the domain separator
// and the message.
// Note: To ensure Safari treats this as a user gesture, ensure to not use async methods
// besides the actualy webauthn functionality (such as `sign`). Safari will de-register
// a user gesture if you await an async call thats not fetch, xhr, or setTimeout.
const challenge = new Uint8Array([
...domainSeparator,
...new Uint8Array(requestIdOf(Object.assign({}, delegation))),
]);
const signature = await from.sign(bufFromBufLike(challenge));
return {
delegation,
signature,
};
}
/**
* A chain of delegations. This is JSON Serializable.
* This is the object to serialize and pass to a DelegationIdentity. It does not keep any
* private keys.
*/
export class DelegationChain {
constructor(delegations, publicKey) {
this.delegations = delegations;
this.publicKey = publicKey;
}
/**
* Create a delegation chain between two (or more) keys. By default, the expiration time
* will be very short (15 minutes).
*
* To build a chain of more than 2 identities, this function needs to be called multiple times,
* passing the previous delegation chain into the options argument. For example:
* @example
* const rootKey = createKey();
* const middleKey = createKey();
* const bottomeKey = createKey();
*
* const rootToMiddle = await DelegationChain.create(
* root, middle.getPublicKey(), Date.parse('2100-01-01'),
* );
* const middleToBottom = await DelegationChain.create(
* middle, bottom.getPublicKey(), Date.parse('2100-01-01'), { previous: rootToMiddle },
* );
*
* // We can now use a delegation identity that uses the delegation above:
* const identity = DelegationIdentity.fromDelegation(bottomKey, middleToBottom);
* @param from The identity that will delegate.
* @param to The identity that gets delegated. It can now sign messages as if it was the
* identity above.
* @param expiration The length the delegation is valid. By default, 15 minutes from calling
* this function.
* @param options A set of options for this delegation. expiration and previous
* @param options.previous - Another DelegationChain that this chain should start with.
* @param options.targets - targets that scope the delegation (e.g. Canister Principals)
*/
static async create(from, to, expiration = new Date(Date.now() + 15 * 60 * 1000), options = {}) {
var _a, _b;
const delegation = await _createSingleDelegation(from, to, expiration, options.targets);
return new DelegationChain([...(((_a = options.previous) === null || _a === void 0 ? void 0 : _a.delegations) || []), delegation], ((_b = options.previous) === null || _b === void 0 ? void 0 : _b.publicKey) || from.getPublicKey().toDer());
}
/**
* Creates a DelegationChain object from a JSON string.
* @param json The JSON string to parse.
*/
static fromJSON(json) {
const { publicKey, delegations } = typeof json === 'string' ? JSON.parse(json) : json;
if (!Array.isArray(delegations)) {
throw new Error('Invalid delegations.');
}
const parsedDelegations = delegations.map(signedDelegation => {
const { delegation, signature } = signedDelegation;
const { pubkey, expiration, targets } = delegation;
if (targets !== undefined && !Array.isArray(targets)) {
throw new Error('Invalid targets.');
}
return {
delegation: new Delegation(_parseBlob(pubkey), BigInt('0x' + expiration), // expiration in JSON is an hexa string (See toJSON() below).
targets &&
targets.map((t) => {
if (typeof t !== 'string') {
throw new Error('Invalid target.');
}
return Principal.fromHex(t);
})),
signature: _parseBlob(signature),
};
});
return new this(parsedDelegations, _parseBlob(publicKey));
}
/**
* Creates a DelegationChain object from a list of delegations and a DER-encoded public key.
* @param delegations The list of delegations.
* @param publicKey The DER-encoded public key of the key-pair signing the first delegation.
*/
static fromDelegations(delegations, publicKey) {
return new this(delegations, publicKey);
}
toJSON() {
return {
delegations: this.delegations.map(signedDelegation => {
const { delegation, signature } = signedDelegation;
const { targets } = delegation;
return {
delegation: Object.assign({ expiration: delegation.expiration.toString(16), pubkey: toHex(delegation.pubkey) }, (targets && {
targets: targets.map(t => t.toHex()),
})),
signature: toHex(signature),
};
}),
publicKey: toHex(this.publicKey),
};
}
}
/**
* An Identity that adds delegation to a request. Everywhere in this class, the name
* innerKey refers to the SignIdentity that is being used to sign the requests, while
* originalKey is the identity that is being borrowed. More identities can be used
* in the middle to delegate.
*/
export class DelegationIdentity extends SignIdentity {
constructor(_inner, _delegation) {
super();
this._inner = _inner;
this._delegation = _delegation;
}
/**
* Create a delegation without having access to delegateKey.
* @param key The key used to sign the requests.
* @param delegation A delegation object created using `createDelegation`.
*/
static fromDelegation(key, delegation) {
return new this(key, delegation);
}
getDelegation() {
return this._delegation;
}
getPublicKey() {
return {
derKey: this._delegation.publicKey,
toDer: () => this._delegation.publicKey,
};
}
sign(blob) {
return this._inner.sign(blob);
}
async transformRequest(request) {
const { body } = request, fields = __rest(request, ["body"]);
const requestId = await requestIdOf(body);
return Object.assign(Object.assign({}, fields), { body: {
content: body,
sender_sig: await this.sign(bufFromBufLike(new Uint8Array([...requestDomainSeparator, ...new Uint8Array(requestId)]))),
sender_delegation: this._delegation.delegations,
sender_pubkey: this._delegation.publicKey,
} });
}
}
/**
* A partial delegated identity, representing a delegation chain and the public key that it targets
*/
export class PartialDelegationIdentity extends PartialIdentity {
constructor(inner, delegation) {
super(inner);
_PartialDelegationIdentity_delegation.set(this, void 0);
__classPrivateFieldSet(this, _PartialDelegationIdentity_delegation, delegation, "f");
}
/**
* The Delegation Chain of this identity.
*/
get delegation() {
return __classPrivateFieldGet(this, _PartialDelegationIdentity_delegation, "f");
}
/**
* Create a {@link PartialDelegationIdentity} from a {@link PublicKey} and a {@link DelegationChain}.
* @param key The {@link PublicKey} to delegate to.
* @param delegation a {@link DelegationChain} targeting the inner key.
* @constructs PartialDelegationIdentity
*/
static fromDelegation(key, delegation) {
return new PartialDelegationIdentity(key, delegation);
}
}
_PartialDelegationIdentity_delegation = new WeakMap();
/**
* Analyze a DelegationChain and validate that it's valid, ie. not expired and apply to the
* scope.
* @param chain The chain to validate.
* @param checks Various checks to validate on the chain.
*/
export function isDelegationValid(chain, checks) {
// Verify that the no delegation is expired. If any are in the chain, returns false.
for (const { delegation } of chain.delegations) {
// prettier-ignore
if (+new Date(Number(delegation.expiration / BigInt(1000000))) <= +Date.now()) {
return false;
}
}
// Check the scopes.
const scopes = [];
const maybeScope = checks === null || checks === void 0 ? void 0 : checks.scope;
if (maybeScope) {
if (Array.isArray(maybeScope)) {
scopes.push(...maybeScope.map(s => (typeof s === 'string' ? Principal.fromText(s) : s)));
}
else {
scopes.push(typeof maybeScope === 'string' ? Principal.fromText(maybeScope) : maybeScope);
}
}
for (const s of scopes) {
const scope = s.toText();
for (const { delegation } of chain.delegations) {
if (delegation.targets === undefined) {
continue;
}
let none = true;
for (const target of delegation.targets) {
if (target.toText() === scope) {
none = false;
break;
}
}
if (none) {
return false;
}
}
}
return true;
}
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