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Prevent self transfer #176

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merged 2 commits into from
Jun 5, 2020
Merged

Prevent self transfer #176

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1aed4d8
Prevent self transfer
Jun 4, 2020
a9d7ae4
Rebase
Jun 5, 2020
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Binary file modified examples/fungible-token/res/fungible_token.wasm
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19 changes: 19 additions & 0 deletions examples/fungible-token/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,10 @@ impl FungibleToken {
if amount == 0 {
env::panic(b"Can't transfer 0 tokens");
}
assert_ne!(
owner_id, new_owner_id,
"The new owner should be different from the current owner"
);
// Retrieving the account from the state.
let mut account = self.get_account(&owner_id);

Expand Down Expand Up @@ -321,6 +325,21 @@ mod tests {
assert_eq!(contract.get_balance(bob()).0, transfer_amount);
}

#[test]
#[should_panic(expected = "The new owner should be different from the current owner")]
fn test_transfer_fail_self() {
let mut context = get_context(carol());
testing_env!(context.clone());
let total_supply = 1_000_000_000_000_000u128;
let mut contract = FungibleToken::new(carol(), total_supply.into());
context.storage_usage = env::storage_usage();

context.attached_deposit = 1000 * STORAGE_PRICE_PER_BYTE;
testing_env!(context.clone());
let transfer_amount = total_supply / 3;
contract.transfer(carol(), transfer_amount.into());
}

#[test]
#[should_panic(expected = "Can not set allowance for yourself")]
fn test_self_allowance_fail() {
Expand Down