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lib.rs
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lib.rs
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use std::collections::HashSet;
use std::convert::TryFrom;
use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
use near_sdk::collections::UnorderedMap;
use near_sdk::json_types::{Base58PublicKey, Base64VecU8, U128, U64};
use near_sdk::{env, near_bindgen, AccountId, Promise, PromiseOrValue, PublicKey};
use near_sdk::serde::{Deserialize, Serialize};
/// Unlimited allowance for multisig keys.
const DEFAULT_ALLOWANCE: u128 = 0;
// Request cooldown period (time before a request can be deleted)
const REQUEST_COOLDOWN: u64 = 900_000_000_000;
pub type RequestId = u32;
/// Permissions for function call access key.
#[derive(Clone, PartialEq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
#[serde(crate = "near_sdk::serde")]
pub struct FunctionCallPermission {
allowance: Option<U128>,
receiver_id: AccountId,
method_names: Vec<String>,
}
/// Lowest level action that can be performed by the multisig contract.
#[derive(Clone, PartialEq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
#[serde(tag = "type", crate = "near_sdk::serde")]
pub enum MultiSigRequestAction {
/// Transfers given amount to receiver.
Transfer { amount: U128 },
/// Create a new account.
CreateAccount,
/// Deploys contract to receiver's account. Can upgrade given contract as well.
DeployContract { code: Base64VecU8 },
/// Adds key, either new key for multisig or full access key to another account.
AddKey {
public_key: Base58PublicKey,
#[serde(skip_serializing_if = "Option::is_none")]
permission: Option<FunctionCallPermission>,
},
/// Deletes key, either one of the keys from multisig or key from another account.
DeleteKey { public_key: Base58PublicKey },
/// Call function on behalf of this contract.
FunctionCall {
method_name: String,
args: Base64VecU8,
deposit: U128,
gas: U64,
},
/// Sets number of confirmations required to authorize requests.
/// Can not be bundled with any other actions or transactions.
SetNumConfirmations { num_confirmations: u32 },
/// Sets number of active requests (unconfirmed requests) per access key
/// Default is 12 unconfirmed requests at a time
/// The REQUEST_COOLDOWN for requests is 15min
/// Worst gas attack a malicious keyholder could do is 12 requests every 15min
SetActiveRequestsLimit { active_requests_limit: u32 },
}
// The request the user makes specifying the receiving account and actions they want to execute (1 tx)
#[derive(Clone, PartialEq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
#[serde(crate = "near_sdk::serde")]
pub struct MultiSigRequest {
receiver_id: AccountId,
actions: Vec<MultiSigRequestAction>,
}
// An internal request wrapped with the signer_pk and added timestamp to determine num_requests_pk and prevent against malicious key holder gas attacks
#[derive(Clone, PartialEq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
#[serde(crate = "near_sdk::serde")]
pub struct MultiSigRequestWithSigner {
request: MultiSigRequest,
signer_pk: PublicKey,
added_timestamp: u64,
}
#[near_bindgen]
#[derive(BorshDeserialize, BorshSerialize)]
pub struct MultiSigContract {
num_confirmations: u32,
request_nonce: RequestId,
requests: UnorderedMap<RequestId, MultiSigRequestWithSigner>,
confirmations: UnorderedMap<RequestId, HashSet<PublicKey>>,
num_requests_pk: UnorderedMap<PublicKey, u32>,
// per key
active_requests_limit: u32,
}
// If you haven't initialized the contract with new(num_confirmations: u32)
impl Default for MultiSigContract {
fn default() -> Self {
env::panic(b"Multisig contract should be initialized before usage")
}
}
#[near_bindgen]
impl MultiSigContract {
/// Initialize multisig contract.
/// @params num_confirmations: k of n signatures required to perform operations.
#[init]
pub fn new(num_confirmations: u32) -> Self {
assert!(!env::state_exists(), "Already initialized");
Self {
num_confirmations,
request_nonce: 0,
requests: UnorderedMap::new(b"r".to_vec()),
confirmations: UnorderedMap::new(b"c".to_vec()),
num_requests_pk: UnorderedMap::new(b"k".to_vec()),
active_requests_limit: 12,
}
}
/// Add request for multisig.
pub fn add_request(&mut self, request: MultiSigRequest) -> RequestId {
assert_eq!(
env::current_account_id(),
env::predecessor_account_id(),
"Predecessor account must much current account"
);
// track how many requests this key has made
let num_requests = self
.num_requests_pk
.get(&env::signer_account_pk())
.unwrap_or(0)
+ 1;
assert!(
num_requests <= self.active_requests_limit,
"Account has too many active requests. Confirm or delete some."
);
self.num_requests_pk
.insert(&env::signer_account_pk(), &num_requests);
// add the request
let request_added = MultiSigRequestWithSigner {
signer_pk: env::signer_account_pk(),
added_timestamp: env::block_timestamp(),
request: request,
};
self.requests.insert(&self.request_nonce, &request_added);
let confirmations = HashSet::new();
self.confirmations
.insert(&self.request_nonce, &confirmations);
self.request_nonce += 1;
self.request_nonce - 1
}
/// Add request for multisig and confirm with the pk that added.
pub fn add_request_and_confirm(&mut self, request: MultiSigRequest) -> RequestId {
let request_id = self.add_request(request);
self.confirm(request_id);
request_id
}
/// Remove given request and associated confirmations.
pub fn delete_request(&mut self, request_id: RequestId) {
self.assert_valid_request(request_id);
let request_with_signer = self.requests.get(&request_id).expect("No such request");
// can't delete requests before 15min
assert!(
env::block_timestamp() > request_with_signer.added_timestamp + REQUEST_COOLDOWN,
"Request cannot be deleted immediately after creation."
);
self.remove_request(request_id);
}
fn execute_request(&mut self, request: MultiSigRequest) -> PromiseOrValue<bool> {
let mut promise = Promise::new(request.receiver_id.clone());
let receiver_id = request.receiver_id.clone();
let num_actions = request.actions.len();
for action in request.actions {
promise = match action {
MultiSigRequestAction::Transfer { amount } => promise.transfer(amount.into()),
MultiSigRequestAction::CreateAccount => promise.create_account(),
MultiSigRequestAction::DeployContract { code } => {
promise.deploy_contract(code.into())
}
MultiSigRequestAction::AddKey {
public_key,
permission,
} => {
self.assert_self_request(receiver_id.clone());
if let Some(permission) = permission {
promise.add_access_key(
public_key.into(),
permission
.allowance
.map(|x| x.into())
.unwrap_or(DEFAULT_ALLOWANCE),
permission.receiver_id,
permission.method_names.join(",").into_bytes(),
)
} else {
// wallet UI should warn user if receiver_id == env::current_account_id(), adding FAK will render multisig useless
promise.add_full_access_key(public_key.into())
}
}
MultiSigRequestAction::DeleteKey { public_key } => {
self.assert_self_request(receiver_id.clone());
let pk: PublicKey = public_key.into();
// delete outstanding requests by public_key
let request_ids: Vec<u32> = self
.requests
.iter()
.filter(|(_k, r)| r.signer_pk == pk)
.map(|(k, _r)| k)
.collect();
for request_id in request_ids {
// remove confirmations for this request
self.confirmations.remove(&request_id);
self.requests.remove(&request_id);
}
// remove num_requests_pk entry for public_key
self.num_requests_pk.remove(&pk);
promise.delete_key(pk)
}
MultiSigRequestAction::FunctionCall {
method_name,
args,
deposit,
gas,
} => promise.function_call(
method_name.into_bytes(),
args.into(),
deposit.into(),
gas.into(),
),
// the following methods must be a single action
MultiSigRequestAction::SetNumConfirmations { num_confirmations } => {
self.assert_one_action_only(receiver_id, num_actions);
self.num_confirmations = num_confirmations;
return PromiseOrValue::Value(true);
}
MultiSigRequestAction::SetActiveRequestsLimit {
active_requests_limit,
} => {
self.assert_one_action_only(receiver_id, num_actions);
self.active_requests_limit = active_requests_limit;
return PromiseOrValue::Value(true);
}
};
}
promise.into()
}
/// Confirm given request with given signing key.
/// If with this, there has been enough confirmation, a promise with request will be scheduled.
pub fn confirm(&mut self, request_id: RequestId) -> PromiseOrValue<bool> {
self.assert_valid_request(request_id);
let mut confirmations = self.confirmations.get(&request_id).unwrap();
assert!(
!confirmations.contains(&env::signer_account_pk()),
"Already confirmed this request with this key"
);
if confirmations.len() as u32 + 1 >= self.num_confirmations {
let request = self.remove_request(request_id);
/********************************
NOTE: If the tx execution fails for any reason, the request and confirmations are removed already, so the client has to start all over
********************************/
self.execute_request(request)
} else {
confirmations.insert(env::signer_account_pk());
self.confirmations.insert(&request_id, &confirmations);
PromiseOrValue::Value(true)
}
}
/********************************
Helper methods
********************************/
// removes request, removes confirmations and reduces num_requests_pk - used in delete, delete_key, and confirm
fn remove_request(&mut self, request_id: RequestId) -> MultiSigRequest {
// remove confirmations for this request
self.confirmations.remove(&request_id);
// remove the original request
let request_with_signer = self
.requests
.remove(&request_id)
.expect("Failed to remove existing element");
// decrement num_requests for original request signer
let original_signer_pk = request_with_signer.signer_pk;
let mut num_requests = self.num_requests_pk.get(&original_signer_pk).unwrap_or(0);
// safety check for underrun (unlikely since original_signer_pk must have num_requests_pk > 0)
if num_requests > 0 {
num_requests = num_requests - 1;
}
self.num_requests_pk
.insert(&original_signer_pk, &num_requests);
// return request
request_with_signer.request
}
// Prevents access to calling requests and make sure request_id is valid - used in delete and confirm
fn assert_valid_request(&mut self, request_id: RequestId) {
// request must come from key added to contract account
assert_eq!(
env::current_account_id(),
env::predecessor_account_id(),
"Predecessor account must much current account"
);
// request must exist
assert!(
self.requests.get(&request_id).is_some(),
"No such request: either wrong number or already confirmed"
);
// request must have
assert!(
self.confirmations.get(&request_id).is_some(),
"Internal error: confirmations mismatch requests"
);
}
// Prevents request from approving tx on another account
fn assert_self_request(&mut self, receiver_id: AccountId) {
assert_eq!(
receiver_id,
env::current_account_id(),
"This method only works when receiver_id is equal to current_account_id"
);
}
// Prevents a request from being bundled with other actions
fn assert_one_action_only(&mut self, receiver_id: AccountId, num_actions: usize) {
self.assert_self_request(receiver_id);
assert_eq!(num_actions, 1, "This method should be a separate request");
}
/********************************
View methods
********************************/
pub fn get_request(&self, request_id: RequestId) -> MultiSigRequest {
(self.requests.get(&request_id).expect("No such request")).request
}
pub fn get_num_requests_pk(&self, public_key: Base58PublicKey) -> u32 {
self.num_requests_pk.get(&public_key.into()).unwrap_or(0)
}
pub fn list_request_ids(&self) -> Vec<RequestId> {
self.requests.keys().collect()
}
pub fn get_confirmations(&self, request_id: RequestId) -> Vec<Base58PublicKey> {
self.confirmations
.get(&request_id)
.expect("No such request")
.into_iter()
.map(|key| Base58PublicKey::try_from(key).expect("Failed to covert key to base58"))
.collect()
}
pub fn get_num_confirmations(&self) -> u32 {
self.num_confirmations
}
pub fn get_request_nonce(&self) -> u32 {
self.request_nonce
}
}
#[cfg(test)]
mod tests {
use std::fmt::{Debug, Error, Formatter};
use near_sdk::{testing_env, MockedBlockchain};
use near_sdk::{AccountId, VMContext};
use near_sdk::{Balance, BlockHeight, EpochHeight};
use super::*;
/// Used for asserts_eq.
/// TODO: replace with derive when https://github.com/near/near-sdk-rs/issues/165
impl Debug for MultiSigRequest {
fn fmt(&self, _f: &mut Formatter<'_>) -> Result<(), Error> {
panic!("Should not trigger");
}
}
pub fn alice() -> AccountId {
"alice".to_string()
}
pub fn bob() -> AccountId {
"bob".to_string()
}
pub struct VMContextBuilder {
context: VMContext,
}
impl VMContextBuilder {
pub fn new() -> Self {
Self {
context: VMContext {
current_account_id: "".to_string(),
signer_account_id: "".to_string(),
signer_account_pk: vec![0, 1, 2],
predecessor_account_id: "".to_string(),
input: vec![],
epoch_height: 0,
block_index: 0,
block_timestamp: 0,
account_balance: 0,
account_locked_balance: 0,
storage_usage: 10u64.pow(6),
attached_deposit: 0,
prepaid_gas: 10u64.pow(18),
random_seed: vec![0, 1, 2],
is_view: false,
output_data_receivers: vec![],
},
}
}
pub fn current_account_id(mut self, account_id: AccountId) -> Self {
self.context.current_account_id = account_id;
self
}
pub fn block_timestamp(mut self, time: u64) -> Self {
self.context.block_timestamp = time;
self
}
#[allow(dead_code)]
pub fn signer_account_id(mut self, account_id: AccountId) -> Self {
self.context.signer_account_id = account_id;
self
}
pub fn signer_account_pk(mut self, signer_account_pk: PublicKey) -> Self {
self.context.signer_account_pk = signer_account_pk;
self
}
pub fn predecessor_account_id(mut self, account_id: AccountId) -> Self {
self.context.predecessor_account_id = account_id;
self
}
#[allow(dead_code)]
pub fn block_index(mut self, block_index: BlockHeight) -> Self {
self.context.block_index = block_index;
self
}
#[allow(dead_code)]
pub fn epoch_height(mut self, epoch_height: EpochHeight) -> Self {
self.context.epoch_height = epoch_height;
self
}
#[allow(dead_code)]
pub fn attached_deposit(mut self, amount: Balance) -> Self {
self.context.attached_deposit = amount;
self
}
pub fn account_balance(mut self, amount: Balance) -> Self {
self.context.account_balance = amount;
self
}
#[allow(dead_code)]
pub fn account_locked_balance(mut self, amount: Balance) -> Self {
self.context.account_locked_balance = amount;
self
}
pub fn finish(self) -> VMContext {
self.context
}
}
fn context_with_key(key: PublicKey, amount: Balance) -> VMContext {
VMContextBuilder::new()
.current_account_id(alice())
.predecessor_account_id(alice())
.signer_account_id(alice())
.signer_account_pk(key)
.account_balance(amount)
.finish()
}
fn context_with_key_future(key: PublicKey, amount: Balance) -> VMContext {
VMContextBuilder::new()
.current_account_id(alice())
.block_timestamp(REQUEST_COOLDOWN + 1)
.predecessor_account_id(alice())
.signer_account_id(alice())
.signer_account_pk(key)
.account_balance(amount)
.finish()
}
#[test]
fn test_multi_3_of_n() {
let amount = 1_000;
testing_env!(context_with_key(
Base58PublicKey::try_from("Eg2jtsiMrprn7zgKKUk79qM1hWhANsFyE6JSX4txLEuy")
.unwrap()
.into(),
amount
));
let mut c = MultiSigContract::new(3);
let request = MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
};
let request_id = c.add_request(request.clone());
assert_eq!(c.get_request(request_id), request);
assert_eq!(c.list_request_ids(), vec![request_id]);
c.confirm(request_id);
assert_eq!(c.requests.len(), 1);
assert_eq!(c.confirmations.get(&request_id).unwrap().len(), 1);
testing_env!(context_with_key(
Base58PublicKey::try_from("HghiythFFPjVXwc9BLNi8uqFmfQc1DWFrJQ4nE6ANo7R")
.unwrap()
.into(),
amount
));
c.confirm(request_id);
assert_eq!(c.confirmations.get(&request_id).unwrap().len(), 2);
assert_eq!(c.get_confirmations(request_id).len(), 2);
testing_env!(context_with_key(
Base58PublicKey::try_from("2EfbwnQHPBWQKbNczLiVznFghh9qs716QT71zN6L1D95")
.unwrap()
.into(),
amount
));
c.confirm(request_id);
// TODO: confirm that funds were transferred out via promise.
assert_eq!(c.requests.len(), 0);
}
#[test]
fn test_multi_add_request_and_confirm() {
let amount = 1_000;
testing_env!(context_with_key(
Base58PublicKey::try_from("Eg2jtsiMrprn7zgKKUk79qM1hWhANsFyE6JSX4txLEuy")
.unwrap()
.into(),
amount
));
let mut c = MultiSigContract::new(3);
let request = MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
};
let request_id = c.add_request_and_confirm(request.clone());
assert_eq!(c.get_request(request_id), request);
assert_eq!(c.list_request_ids(), vec![request_id]);
// c.confirm(request_id);
assert_eq!(c.requests.len(), 1);
assert_eq!(c.confirmations.get(&request_id).unwrap().len(), 1);
testing_env!(context_with_key(
Base58PublicKey::try_from("HghiythFFPjVXwc9BLNi8uqFmfQc1DWFrJQ4nE6ANo7R")
.unwrap()
.into(),
amount
));
c.confirm(request_id);
assert_eq!(c.confirmations.get(&request_id).unwrap().len(), 2);
assert_eq!(c.get_confirmations(request_id).len(), 2);
testing_env!(context_with_key(
Base58PublicKey::try_from("2EfbwnQHPBWQKbNczLiVznFghh9qs716QT71zN6L1D95")
.unwrap()
.into(),
amount
));
c.confirm(request_id);
// TODO: confirm that funds were transferred out via promise.
assert_eq!(c.requests.len(), 0);
}
#[test]
fn add_key_delete_key_storage_cleared() {
let amount = 1_000;
testing_env!(context_with_key(
Base58PublicKey::try_from("Eg2jtsiMrprn7zgKKUk79qM1hWhANsFyE6JSX4txLEuy")
.unwrap()
.into(),
amount
));
let mut c = MultiSigContract::new(1);
let new_key: Base58PublicKey =
Base58PublicKey::try_from("HghiythFFPjVXwc9BLNi8uqFmfQc1DWFrJQ4nE6ANo7R")
.unwrap()
.into();
// vm current_account_id is alice, receiver_id must be alice
let request = MultiSigRequest {
receiver_id: alice(),
actions: vec![MultiSigRequestAction::AddKey {
public_key: new_key.clone(),
permission: None,
}],
};
// make request
c.add_request_and_confirm(request.clone());
// should be empty now
assert_eq!(c.requests.len(), 0);
// switch accounts
testing_env!(context_with_key(
Base58PublicKey::try_from("HghiythFFPjVXwc9BLNi8uqFmfQc1DWFrJQ4nE6ANo7R")
.unwrap()
.into(),
amount
));
let request2 = MultiSigRequest {
receiver_id: alice(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
};
// make request but don't confirm
c.add_request(request2.clone());
// should have 1 request now
assert_eq!(c.requests.len(), 1);
assert_eq!(c.get_num_requests_pk(new_key.clone()), 1);
// self delete key
let request3 = MultiSigRequest {
receiver_id: alice(),
actions: vec![MultiSigRequestAction::DeleteKey {
public_key: new_key.clone(),
}],
};
// make request and confirm
c.add_request_and_confirm(request3.clone());
// should be empty now
assert_eq!(c.requests.len(), 0);
assert_eq!(c.get_num_requests_pk(new_key.clone()), 0);
}
#[test]
#[should_panic]
fn test_panics_add_key_different_account() {
let amount = 1_000;
testing_env!(context_with_key(
Base58PublicKey::try_from("Eg2jtsiMrprn7zgKKUk79qM1hWhANsFyE6JSX4txLEuy")
.unwrap()
.into(),
amount
));
let mut c = MultiSigContract::new(1);
let new_key: Base58PublicKey =
Base58PublicKey::try_from("HghiythFFPjVXwc9BLNi8uqFmfQc1DWFrJQ4nE6ANo7R")
.unwrap()
.into();
// vm current_account_id is alice, receiver_id must be alice
let request = MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::AddKey {
public_key: new_key.clone(),
permission: None,
}],
};
// make request
c.add_request_and_confirm(request);
}
#[test]
fn test_change_num_confirmations() {
let amount = 1_000;
testing_env!(context_with_key(vec![1, 2, 3], amount));
let mut c = MultiSigContract::new(1);
let request_id = c.add_request(MultiSigRequest {
receiver_id: alice(),
actions: vec![MultiSigRequestAction::SetNumConfirmations {
num_confirmations: 2,
}],
});
c.confirm(request_id);
assert_eq!(c.num_confirmations, 2);
}
#[test]
#[should_panic]
fn test_panics_on_second_confirm() {
let amount = 1_000;
testing_env!(context_with_key(vec![5, 7, 9], amount));
let mut c = MultiSigContract::new(3);
let request_id = c.add_request(MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
});
assert_eq!(c.requests.len(), 1);
assert_eq!(c.confirmations.get(&request_id).unwrap().len(), 0);
c.confirm(request_id);
assert_eq!(c.confirmations.get(&request_id).unwrap().len(), 1);
c.confirm(request_id);
}
#[test]
#[should_panic]
fn test_panics_delete_request() {
let amount = 1_000;
testing_env!(context_with_key(vec![5, 7, 9], amount));
let mut c = MultiSigContract::new(3);
let request_id = c.add_request(MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
});
c.delete_request(request_id);
assert_eq!(c.requests.len(), 0);
assert_eq!(c.confirmations.len(), 0);
}
#[test]
fn test_delete_request_future() {
let amount = 1_000;
testing_env!(context_with_key(vec![5, 7, 9], amount));
let mut c = MultiSigContract::new(3);
let request_id = c.add_request(MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
});
testing_env!(context_with_key_future(vec![5, 7, 9], amount));
c.delete_request(request_id);
assert_eq!(c.requests.len(), 0);
assert_eq!(c.confirmations.len(), 0);
}
#[test]
#[should_panic]
fn test_delete_request_panic_wrong_key() {
let amount = 1_000;
testing_env!(context_with_key(vec![5, 7, 9], amount));
let mut c = MultiSigContract::new(3);
let request_id = c.add_request(MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
});
testing_env!(context_with_key(vec![1, 2, 3], amount));
c.delete_request(request_id);
}
#[test]
#[should_panic]
fn test_too_many_requests() {
let amount = 1_000;
testing_env!(context_with_key(vec![5, 7, 9], amount));
let mut c = MultiSigContract::new(3);
for _i in 0..16 {
c.add_request(MultiSigRequest {
receiver_id: bob(),
actions: vec![MultiSigRequestAction::Transfer {
amount: amount.into(),
}],
});
}
}
}