Phase 2

Cargo.toml

@@ -21,4 +21,4 @@ codegen-units = 1
 lto = true
 
 [workspace.dependencies.soroban-sdk]
-version = "20.0.0"
+version = "20.5.0"

README.md

@@ -1,5 +1,9 @@
-# sep-41-token
-SEP-0041 Trait, Client, and mock contract.
+# SEP-0041-token
+SEP-0041 Trait, Client, and mock testing contract.
 
 SEP-0041 Definition: https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0041.md
 
+## Safety
+This is **experimental software** and is provided on an "as is" and "as available" basis.
+
+We do **not give any warranties** and **will not be liable for any loss** incurred through any use of this codebase.

mock-sep-41/src/allowance.rs

@@ -20,11 +20,13 @@ pub fn spend_allowance(e: &Env, from: &Address, spender: &Address, amount: i128)
     if allowance.amount < amount || e.ledger().sequence() > allowance.expiration_ledger {
         panic_with_error!(e, TokenError::AllowanceError);
     }
-    storage::set_allowance(
-        e,
-        from,
-        spender,
-        allowance.amount - amount,
-        allowance.expiration_ledger,
-    );
+    if amount > 0 {
+        storage::set_allowance(
+            e,
+            from,
+            spender,
+            allowance.amount - amount,
+            allowance.expiration_ledger,
+        );
+    }
 }

mock-sep-41/src/storage.rs

@@ -4,11 +4,11 @@ use soroban_sdk::{
 };
 
 pub(crate) const DAY_IN_LEDGERS: u32 = 17280;
-pub(crate) const INSTANCE_BUMP_AMOUNT: u32 = 8 * DAY_IN_LEDGERS;
+pub(crate) const INSTANCE_BUMP_AMOUNT: u32 = 31 * DAY_IN_LEDGERS;
 pub(crate) const INSTANCE_LIFETIME_THRESHOLD: u32 = INSTANCE_BUMP_AMOUNT - DAY_IN_LEDGERS;
 
-pub(crate) const BALANCE_BUMP_AMOUNT: u32 = 31 * DAY_IN_LEDGERS - 1;
-pub(crate) const BALANCE_LIFETIME_THRESHOLD: u32 = BALANCE_BUMP_AMOUNT - DAY_IN_LEDGERS;
+pub(crate) const BALANCE_BUMP_AMOUNT: u32 = 120 * DAY_IN_LEDGERS;
+pub(crate) const BALANCE_LIFETIME_THRESHOLD: u32 = BALANCE_BUMP_AMOUNT - 20 * DAY_IN_LEDGERS;
 
 const METADATA_KEY: Symbol = symbol_short!("METADATA");
 const ADMIN_KEY: Symbol = symbol_short!("ADMIN");

mock-sep-41/src/test.rs

@@ -1,7 +1,11 @@
 #![cfg(test)]
 extern crate std;
 
-use crate::{contract::MockToken, MockTokenClient};
+use crate::{
+    contract::MockToken,
+    storage::{AllowanceDataKey, DataKey},
+    MockTokenClient,
+};
 use soroban_sdk::{
     symbol_short,
     testutils::{Address as _, AuthorizedFunction, AuthorizedInvocation},
@@ -254,3 +258,24 @@ fn decimal_is_over_max() {
         &"symbol".into_val(&e),
     );
 }
+
+#[test]
+fn test_zero_allowance() {
+    // Here we test that transfer_from with a 0 amount does not create an empty allowance
+    let e = Env::default();
+    e.mock_all_auths();
+
+    let admin = Address::generate(&e);
+    let spender = Address::generate(&e);
+    let from = Address::generate(&e);
+    let token = create_token(&e, &admin);
+
+    token.transfer_from(&spender, &from, &spender, &0);
+    e.as_contract(&token.address, || {
+        let key = DataKey::Allowance(AllowanceDataKey {
+            from: from.clone(),
+            spender: spender.clone(),
+        });
+        assert!(!e.storage().temporary().has(&key));
+    });
+}

sep-41/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sep-41-token"
-version = "0.3.0"
+version = "1.0.0"
 description = "SEP-0041 Standard Token trait, client, and mock implementation"
 authors = ["Script3 <support@script3.io>"]
 repository = "https://github.com/script3/sep-40-oracle"

sep-41/README.md

@@ -3,6 +3,11 @@ Exposes the interface of the SEP-0041 Token alongside a mock token contract.
 
 SEP-0041 Definition: https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0041.md
 
+## Safety
+This is **experimental software** and is provided on an "as is" and "as available" basis.
+
+We do **not give any warranties** and **will not be liable for any loss** incurred through any use of this codebase.
+
 ## Getting Started
 
 Add the package to your `Cargo.toml`:
@@ -18,3 +23,30 @@ You can optionally include the `testutils` feature in your `dev-dependencies` to
 [dev_dependencies]
 sep-40-token = { version = "<desired version>", features = ["testutils"] }
 ```
+
+### Client and Traits
+This package exposes 3 different token clients based on your usage.
+
+* `TokenClient` is the `SEP-0041` standard and is derived from the trait `Token`
+* `StellarAssetClient` exposes the functions implemented by the Stellar Asset Contract and is derived from the trait `StellarAssetExtension`
+
+### Mock Token
+This package exposes an example Soroban token implementation of the `SEP-0041` standard that can be used to test protocol interactions with Soroban tokens. This is important to test as interacting with Soroban tokens has a much larger cost impact than interacting with the Stellar Asset Contract.
+
+A WASM version of the contract can be deployed as follows:
+```rust
+use sep_41_token::testutils::{MockTokenClient, MockTokenWASM};
+use soroban_sdk::{testutils::Address as _, Address, Env, String};
+
+let env = Env::default();
+
+let admin = Address::generate(&env);
+let token_id = env.register_contract_wasm(None, MockTokenWASM);
+let token_client = MockTokenClient::new(&env, &token_id);
+token_client.initialize(
+    &admin,
+    &7,
+    &String::from_str(&env, "Name"),
+    &String::from_str(&env, "Symbol"),
+);
+```

sep-41/src/lib.rs

@@ -194,10 +194,10 @@ impl TokenEvents {
         from: Address,
         spender: Address,
         amount: i128,
-        expiration_ledger: u32,
+        live_until_ledger: u32,
     ) {
         let topics = (symbol_short!("approve"), from, spender);
-        env.events().publish(topics, (amount, expiration_ledger));
+        env.events().publish(topics, (amount, live_until_ledger));
     }
 
     /// Emitted when an amount is transferred from one address to another