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use crate::{
error::RuleSetError,
payload::Payload,
// TODO: Uncomment this after on-curve sycall available.
// utils::is_on_curve,
utils::{assert_derivation, compute_merkle_root, is_zeroed},
};
use serde::{Deserialize, Serialize};
#[cfg(feature = "serde-with-feature")]
use serde_with::{As, DisplayFromStr};
use solana_program::{
account_info::AccountInfo, entrypoint::ProgramResult, msg, program_error::ProgramError,
pubkey::Pubkey, system_program,
};
use std::collections::{HashMap, HashSet};
#[derive(Serialize, Deserialize, PartialEq, Eq, Debug, Clone)]
/// Operators that can be used to compare against an `Amount` rule.
pub enum CompareOp {
/// Less Than
Lt,
/// Less Than or Equal To
LtEq,
/// Equal To
Eq,
/// Greater Than or Equal To
GtEq,
/// Greater Than
Gt,
}
/// Enum representation of Rule failure conditions
pub enum RuleResult {
/// The rule succeeded.
Success(ProgramError),
/// The rule failed.
Failure(ProgramError),
/// The program failed to execute the rule.
Error(ProgramError),
}
use RuleResult::*;
#[derive(Serialize, Deserialize, PartialEq, Eq, Debug, Clone)]
/// The struct containing every type of Rule and its associated data.
pub enum Rule {
/// Group AND, where every rule contained must pass.
All {
/// The vector of Rules contained under All.
rules: Vec<Rule>,
},
/// Group OR, where at least one rule contained must pass.
Any {
/// The vector of Rules contained under Any.
rules: Vec<Rule>,
},
/// Negation, where the contained rule must fail.
Not {
/// The Rule contained under Not.
rule: Box<Rule>,
},
/// An additional signer must be present. When the `Validate` instruction is called, this rule
/// does not require any `Payload` values, but the additional signer account must be provided
/// to `Validate` via the `additional_rule_accounts` argument so that whether it is a signer
/// can be retrieved from its `AccountInfo` struct.
AdditionalSigner {
/// The public key that must have also signed the transaction.
#[cfg_attr(feature = "serde-with-feature", serde(with = "As::<DisplayFromStr>"))]
account: Pubkey,
},
/// Direct comparison between `Pubkey`s. When the `Validate` instruction is called, this rule
/// requires a `PayloadType` value of `PayloadType::Pubkey`. The `field` value in the rule is
/// used to locate the `Pubkey` in the payload to compare to the `Pubkey` in the rule.
PubkeyMatch {
/// The public key to be compared against.
#[cfg_attr(feature = "serde-with-feature", serde(with = "As::<DisplayFromStr>"))]
pubkey: Pubkey,
/// The field in the `Payload` to be compared.
field: String,
},
/// The comparing `Pubkey` must be in the list of `Pubkey`s. When the `Validate` instruction
/// is called, this rule requires a `PayloadType` value of `PayloadType::Pubkey`. The `field`
/// value in the Rule is used to locate the `Pubkey` in the payload to compare to the `Pubkey`
/// list in the rule.
PubkeyListMatch {
/// The list of public keys to be compared against.
pubkeys: Vec<Pubkey>,
/// The field in the `Payload` to be compared.
field: String,
},
/// The comparing `Pubkey` must be a member of the Merkle tree in the rule. When the
/// `Validate` instruction is called, this rule requires `PayloadType` values of
/// `PayloadType::Pubkey` and `PayloadType::MerkleProof`. The `field` values in the Rule are
/// used to locate them in the `Payload`. The `Pubkey` and the proof are used to calculate
/// a Merkle root which is compared against the root stored in the rule.
PubkeyTreeMatch {
/// The root of the Merkle tree.
root: [u8; 32],
/// The field in the `Payload` to be compared
/// when looking for the `Pubkey`.
pubkey_field: String,
/// The field in the `Payload` to be compared
/// when looking for the Merkle proof.
proof_field: String,
},
/// A resulting PDA derivation of seeds must prove the account is a PDA. When the `Validate`
/// instruction is called, this rule requires `PayloadType` values of `PayloadType::Seeds`.
/// The `field` values in the Rule are used to locate them in the `Payload`. The seeds in the
/// `Payload` and the program ID stored in the Rule are used to derive the PDA from the
/// `Payload`.
PDAMatch {
/// The program used for the PDA derivation. If
/// `None` then the account owner is used.
program: Option<Pubkey>,
/// The field in the `Payload` to be compared
/// when looking for the PDA.
pda_field: String,
/// The field in the `Payload` to be compared
/// when looking for the seeds.
seeds_field: String,
},
/// The `Pubkey` must be owned by a given program. When the `Validate` instruction is called,
/// this rule requires a `PayloadType` value of `PayloadType::Pubkey`. The `field` value in
/// the rule is used to locate the `Pubkey` in the payload for which the owner must be the
/// program in the rule. Note this same `Pubkey` account must also be provided to `Validate`
/// via the `additional_rule_accounts` argument. This is so that the `Pubkey`'s owner can be
/// found from its `AccountInfo` struct.
ProgramOwned {
/// The program that must own the `Pubkey`.
#[cfg_attr(feature = "serde-with-feature", serde(with = "As::<DisplayFromStr>"))]
program: Pubkey,
/// The field in the `Payload` to be compared.
field: String,
},
/// The `Pubkey` must be owned by a program in the list of `Pubkey`s. When the `Validate`
/// instruction is called, this rule requires a `PayloadType` value of `PayloadType::Pubkey`.
/// The `field` value in the rule is used to locate the `Pubkey` in the payload for which the
/// owner must be a program in the list in the rule. Note this same `Pubkey` account must also
/// be provided to `Validate` via the `additional_rule_accounts` argument. This is so that the
/// `Pubkey`'s owner can be found from its `AccountInfo` struct.
ProgramOwnedList {
/// The program that must own the `Pubkey`.
programs: Vec<Pubkey>,
/// The field in the `Payload` to be compared.
field: String,
},
/// The `Pubkey` must be owned by a member of the Merkle tree in the rule. When the `Validate`
/// instruction is called, this rule requires `PayloadType` values of `PayloadType::Pubkey` and
/// `PayloadType::MerkleProof`. The `field` values in the Rule are used to locate them in the
/// `Payload`. Note this same `Pubkey` account must also be provided to `Validate` via the
/// `additional_rule_accounts` argument. This is so that the `Pubkey`'s owner can be found
/// from its `AccountInfo` struct. The owner and the proof are then used to calculate a Merkle
/// root, which is compared against the root stored in the rule.
ProgramOwnedTree {
/// The root of the Merkle tree.
root: [u8; 32],
/// The field in the `Payload` to be compared
/// when looking for the `Pubkey`.
pubkey_field: String,
/// The field in the `Payload` to be compared
/// when looking for the Merkle proof.
proof_field: String,
},
/// Comparison against the amount of tokens being transferred. When the `Validate`
/// instruction is called, this rule requires a `PayloadType` value of `PayloadType::Amount`.
/// The `field` value in the Rule is used to locate the numerical amount in the payload to
/// compare to the amount stored in the rule, using the comparison operator stored in the rule.
Amount {
/// The amount to be compared against.
amount: u64,
/// The operator to be used in the comparison.
operator: CompareOp,
/// The field the amount is stored in.
field: String,
},
/// Comparison based on time between operations. Currently not implemented. This rule
/// is planned check to ensure a certain amount of time has passed. This rule will make use
/// of the `rule_set_state_pda` optional account passed into `Validate`, and will require
/// the optional `rule_authority` account to sign.
Frequency {
/// The authority of the frequency account.
#[cfg_attr(feature = "serde-with-feature", serde(with = "As::<DisplayFromStr>"))]
authority: Pubkey,
},
/// The true test if a pubkey can be signed from a client and therefore is a true wallet account.
/// The details of this rule are as follows: a wallet is defined as being both owned by the
/// System Program and the address is on-curve. The `field` value in the rule is used to
/// locate the `Pubkey` in the payload that must be on-curve and for which the owner must be
/// the System Program. Note this same `Pubkey` account must also be provided to `Validate`
/// via the `additional_rule_accounts` argument. This is so that the `Pubkey`'s owner can be
/// found from its `AccountInfo` struct.
IsWallet {
/// The field in the `Payload` to be checked.
field: String,
},
/// An operation that always succeeds.
Pass,
/// The `Pubkey` must be owned by a program in the set of `Pubkey`s. When the `Validate`
/// instruction is called, this rule requires a `PayloadType` value of `PayloadType::Pubkey`.
/// The `field` value in the rule is used to locate the `Pubkey` in the payload for which the
/// owner must be a program in the set in the rule. Note this same `Pubkey` account must also
/// be provided to `Validate` via the `additional_rule_accounts` argument. This is so that the
/// `Pubkey`'s owner can be found from its `AccountInfo` struct.
ProgramOwnedSet {
/// The program that must own the `Pubkey`.
programs: HashSet<Pubkey>,
/// The field in the `Payload` to be compared.
field: String,
},
/// A rule that tells the operation finder to use the default namespace rule.
Namespace,
}
impl Rule {
/// The top level validation function which parses an entire rule tree.
pub fn validate(
&self,
accounts: &HashMap<Pubkey, &AccountInfo>,
payload: &Payload,
update_rule_state: bool,
rule_set_state_pda: &Option<&AccountInfo>,
rule_authority: &Option<&AccountInfo>,
) -> ProgramResult {
let result = self.low_level_validate(
accounts,
payload,
update_rule_state,
rule_set_state_pda,
rule_authority,
);
match result {
Success(_) => Ok(()),
Failure(err) => Err(err),
Error(err) => Err(err),
}
}
/// Lower level validation function which iterates through a rule tree and applies boolean logic to rule results.
pub fn low_level_validate(
&self,
accounts: &HashMap<Pubkey, &AccountInfo>,
payload: &Payload,
_update_rule_state: bool,
_rule_set_state_pda: &Option<&AccountInfo>,
rule_authority: &Option<&AccountInfo>,
) -> RuleResult {
match self {
Rule::All { rules } => {
msg!("Validating All");
let mut last: Option<ProgramError> = None;
for rule in rules {
let result = rule.low_level_validate(
accounts,
payload,
_update_rule_state,
_rule_set_state_pda,
rule_authority,
);
// Return failure on the first failing rule.
match result {
Success(err) => last = Some(err),
_ => return result,
}
}
// Return pass if and only if all rules passed.
Success(last.unwrap_or_else(|| RuleSetError::UnexpectedRuleSetFailure.into()))
}
Rule::Any { rules } => {
msg!("Validating Any");
let mut last_failure: Option<ProgramError> = None;
let mut last_error: Option<ProgramError> = None;
for rule in rules {
let result = rule.low_level_validate(
accounts,
payload,
_update_rule_state,
_rule_set_state_pda,
rule_authority,
);
match result {
Success(_) => return result,
Failure(err) => last_failure = Some(err),
Error(err) => last_error = Some(err),
}
}
// Return failure if and only if all rules failed. Use the last failure.
if let Some(err) = last_failure {
Failure(err)
} else if let Some(err) = last_error {
// Return invalid if and only if all rules were invalid. Use the last invalid.
Error(err)
} else {
Error(RuleSetError::UnexpectedRuleSetFailure.into())
}
}
Rule::Not { rule } => {
let result = rule.low_level_validate(
accounts,
payload,
_update_rule_state,
_rule_set_state_pda,
rule_authority,
);
// Negate the result.
match result {
Success(err) => Failure(err),
Failure(err) => Success(err),
Error(err) => Error(err),
}
}
Rule::AdditionalSigner { account } => {
msg!("Validating AdditionalSigner");
if let Some(signer) = accounts.get(account) {
if signer.is_signer {
Success(self.to_error())
} else {
Failure(self.to_error())
}
} else {
Error(RuleSetError::MissingAccount.into())
}
}
Rule::PubkeyMatch { pubkey, field } => {
msg!("Validating PubkeyMatch");
let key = match payload.get_pubkey(field) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
if key == pubkey {
Success(self.to_error())
} else {
Failure(self.to_error())
}
}
Rule::PubkeyListMatch { pubkeys, field } => {
msg!("Validating PubkeyListMatch");
let fields = field.split('|').collect::<Vec<&str>>();
if fields.len() > 1 {
let new_rule = Rule::Any {
rules: fields
.iter()
.map(|field| Rule::ProgramOwnedList {
programs: pubkeys.clone(),
field: field.to_string(),
})
.collect(),
};
return new_rule.low_level_validate(
accounts,
payload,
_update_rule_state,
_rule_set_state_pda,
rule_authority,
);
} else {
let key = match payload.get_pubkey(&field.to_owned()) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
if pubkeys.iter().any(|pubkey| pubkey == key) {
return Success(self.to_error());
}
}
Failure(self.to_error())
}
Rule::PubkeyTreeMatch {
root,
pubkey_field,
proof_field,
} => {
msg!("Validating PubkeyTreeMatch");
// Get the `Pubkey` we are checking from the payload.
let leaf = match payload.get_pubkey(pubkey_field) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Get the Merkle proof from the payload.
let merkle_proof = match payload.get_merkle_proof(proof_field) {
Some(merkle_proof) => merkle_proof,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Check if the computed hash (root) is equal to the root in the rule.
let computed_root = compute_merkle_root(leaf, merkle_proof);
if computed_root == *root {
Success(self.to_error())
} else {
Failure(self.to_error())
}
}
Rule::PDAMatch {
program,
pda_field,
seeds_field,
} => {
msg!("Validating PDAMatch");
// Get the PDA from the payload.
let account = match payload.get_pubkey(pda_field) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Get the derivation seeds from the payload.
let seeds = match payload.get_seeds(seeds_field) {
Some(seeds) => seeds,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Get the program ID to use for the PDA derivation from the Rule.
let program = match program {
// If the Pubkey is stored in the rule, use that value.
Some(program) => program,
None => {
// If one is not stored, then assume the program ID is the account owner.
match accounts.get(account) {
Some(account) => account.owner,
_ => return Error(RuleSetError::MissingAccount.into()),
}
}
};
// Convert the Vec of Vec into Vec of u8 slices.
let vec_of_slices = seeds
.seeds
.iter()
.map(Vec::as_slice)
.collect::<Vec<&[u8]>>();
if let Ok(_bump) = assert_derivation(program, account, &vec_of_slices) {
Success(self.to_error())
} else {
Failure(self.to_error())
}
}
Rule::ProgramOwned { program, field } => {
msg!("Validating ProgramOwned");
let key = match payload.get_pubkey(field) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
if let Some(account) = accounts.get(key) {
let data = match account.data.try_borrow() {
Ok(data) => data,
Err(_) => return Error(ProgramError::AccountBorrowFailed),
};
if is_zeroed(&data) {
// Print helpful errors.
if data.len() == 0 {
msg!("Account data is empty");
} else {
msg!("Account data is zeroed");
}
// Account must have nonzero data to count as program-owned.
return Error(self.to_error());
} else if *account.owner == *program {
return Success(self.to_error());
}
} else {
return Error(RuleSetError::MissingAccount.into());
}
Failure(self.to_error())
}
Rule::ProgramOwnedList { programs, field } => {
msg!("Validating ProgramOwnedList");
let fields = field.split('|').collect::<Vec<&str>>();
if fields.len() > 1 {
let new_rule = Rule::Any {
rules: fields
.iter()
.map(|field| Rule::ProgramOwnedList {
programs: programs.clone(),
field: field.to_string(),
})
.collect(),
};
return new_rule.low_level_validate(
accounts,
payload,
_update_rule_state,
_rule_set_state_pda,
rule_authority,
);
} else {
let key = match payload.get_pubkey(&field.to_string()) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
let account = match accounts.get(key) {
Some(account) => account,
_ => return Error(RuleSetError::MissingAccount.into()),
};
let data = match account.data.try_borrow() {
Ok(data) => data,
Err(_) => return Error(ProgramError::AccountBorrowFailed),
};
if is_zeroed(&data) {
// Print helpful errors.
if data.len() == 0 {
msg!("Account data is empty");
} else {
msg!("Account data is zeroed");
}
return Error(RuleSetError::DataIsEmpty.into());
} else if programs.contains(account.owner) {
// Account owner must be in the set.
return Success(self.to_error());
}
}
Failure(self.to_error())
}
Rule::ProgramOwnedTree {
root,
pubkey_field,
proof_field,
} => {
msg!("Validating ProgramOwnedTree");
// Get the `Pubkey` we are checking from the payload.
let key = match payload.get_pubkey(pubkey_field) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Get the `AccountInfo` struct for the `Pubkey`.
let account = match accounts.get(key) {
Some(account) => account,
_ => return Error(RuleSetError::MissingAccount.into()),
};
let data = match account.data.try_borrow() {
Ok(data) => data,
Err(_) => return Error(ProgramError::AccountBorrowFailed),
};
// Account must have nonzero data to count as program-owned.
if is_zeroed(&data) {
// Print helpful errors.
if data.len() == 0 {
msg!("Account data is empty");
} else {
msg!("Account data is zeroed");
}
return Error(RuleSetError::DataIsEmpty.into());
}
// The account owner is the leaf.
let leaf = account.owner;
// Get the Merkle proof from the payload.
let merkle_proof = match payload.get_merkle_proof(proof_field) {
Some(merkle_proof) => merkle_proof,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Check if the computed hash (root) is equal to the root in the rule.
let computed_root = compute_merkle_root(leaf, merkle_proof);
if computed_root == *root {
Success(self.to_error())
} else {
Failure(self.to_error())
}
}
Rule::Amount {
amount: rule_amount,
operator,
field,
} => {
msg!("Validating Amount");
if let Some(payload_amount) = &payload.get_amount(field) {
let operator_fn = match operator {
CompareOp::Lt => PartialOrd::lt,
CompareOp::LtEq => PartialOrd::le,
CompareOp::Eq => PartialEq::eq,
CompareOp::Gt => PartialOrd::gt,
CompareOp::GtEq => PartialOrd::ge,
};
if operator_fn(payload_amount, rule_amount) {
Success(self.to_error())
} else {
Failure(self.to_error())
}
} else {
Error(RuleSetError::MissingPayloadValue.into())
}
}
Rule::Frequency { authority } => {
msg!("Validating Frequency");
if let Some(rule_authority) = rule_authority {
// TODO: If it's the wrong account (first condition) the `IsNotASigner`
// is misleading. Should be improved, perhaps with a `Mismatch` error.
if authority != rule_authority.key || !rule_authority.is_signer {
return Error(RuleSetError::RuleAuthorityIsNotSigner.into());
}
} else {
return Error(RuleSetError::MissingAccount.into());
}
Error(RuleSetError::NotImplemented.into())
}
Rule::Pass => {
msg!("Validating Pass");
Success(self.to_error())
}
Rule::IsWallet { field } => {
msg!("Validating IsWallet");
// Get the `Pubkey` we are checking from the payload.
let key = match payload.get_pubkey(field) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
// Get the `AccountInfo` struct for the `Pubkey` and verify that
// its owner is the System Program.
if let Some(account) = accounts.get(key) {
if *account.owner != system_program::ID {
// TODO: Change error return to commented line after on-curve syscall
// available.
return Error(RuleSetError::NotImplemented.into());
//return (false, self.to_error());
}
} else {
return Error(RuleSetError::MissingAccount.into());
}
// TODO: Uncomment call to `is_on_curve()` after on-curve sycall available.
Error(RuleSetError::NotImplemented.into())
//(is_on_curve(key), self.to_error())
}
Rule::ProgramOwnedSet { programs, field } => {
msg!("Validating ProgramOwnedSet");
let fields = field.split('|').collect::<Vec<&str>>();
if fields.len() > 1 {
let new_rule = Rule::Any {
rules: fields
.iter()
.map(|field| Rule::ProgramOwnedSet {
programs: programs.clone(),
field: field.to_string(),
})
.collect(),
};
return new_rule.low_level_validate(
accounts,
payload,
_update_rule_state,
_rule_set_state_pda,
rule_authority,
);
} else {
let key = match payload.get_pubkey(&field.to_string()) {
Some(pubkey) => pubkey,
_ => return Error(RuleSetError::MissingPayloadValue.into()),
};
let account = match accounts.get(key) {
Some(account) => account,
_ => return Error(RuleSetError::MissingAccount.into()),
};
let data = match account.data.try_borrow() {
Ok(data) => data,
Err(_) => return Error(ProgramError::AccountBorrowFailed),
};
if is_zeroed(&data) {
// Print helpful errors.
if data.len() == 0 {
msg!("Account data is empty");
} else {
msg!("Account data is zeroed");
}
return Error(RuleSetError::DataIsEmpty.into());
} else if programs.contains(account.owner) {
// Account owner must be in the set.
return Success(self.to_error());
}
}
Failure(self.to_error())
}
Rule::Namespace => {
msg!("Validating Namespace");
Failure(self.to_error())
}
}
}
/// Convert the rule to a corresponding error resulting from the rule failure.
pub fn to_error(&self) -> ProgramError {
match self {
Rule::All { .. }
| Rule::Any { .. }
| Rule::Not { .. }
| Rule::Pass
| Rule::Namespace => RuleSetError::UnexpectedRuleSetFailure.into(),
Rule::AdditionalSigner { .. } => RuleSetError::AdditionalSignerCheckFailed.into(),
Rule::PubkeyMatch { .. } => RuleSetError::PubkeyMatchCheckFailed.into(),
Rule::PubkeyListMatch { .. } => RuleSetError::PubkeyListMatchCheckFailed.into(),
Rule::PubkeyTreeMatch { .. } => RuleSetError::PubkeyTreeMatchCheckFailed.into(),
Rule::PDAMatch { .. } => RuleSetError::PDAMatchCheckFailed.into(),
Rule::ProgramOwned { .. } => RuleSetError::ProgramOwnedCheckFailed.into(),
Rule::ProgramOwnedList { .. } => RuleSetError::ProgramOwnedListCheckFailed.into(),
Rule::ProgramOwnedTree { .. } => RuleSetError::ProgramOwnedTreeCheckFailed.into(),
Rule::Amount { .. } => RuleSetError::AmountCheckFailed.into(),
Rule::Frequency { .. } => RuleSetError::FrequencyCheckFailed.into(),
Rule::IsWallet { .. } => RuleSetError::IsWalletCheckFailed.into(),
Rule::ProgramOwnedSet { .. } => RuleSetError::ProgramOwnedSetCheckFailed.into(),
}
}
}