From 5b05079c3bcb0b14c415320785af924f7314a1c6 Mon Sep 17 00:00:00 2001
From: N-thnI <Niheanyi404@gmail.com>
Date: Thu, 30 Jul 2026 00:46:39 +0100
Subject: [PATCH] Harden TaskBounty escrow: safe transfers, refund event
 amount, fix build

The escrow flow (lock on create_task, release on approve_submission,
refund on cancel_task) already existed but the crate could not compile
or run its test suite, so none of it had ever actually been verified:

- Error used #[contracttype] instead of #[contracterror], so
  panic_with_error! couldn't compile.
- Storage keys used raw byte-string literals (b"TASK", ...) as tuple
  keys, which current soroban-sdk no longer accepts; switched to
  symbol_short!, matching the pattern already used in events.rs.
- panic_with_error! needs an explicit import in current soroban-sdk.
- Bumped soroban-sdk 21 -> 23 (matching the sibling contract crate in
  this repo) since 21's pinned soroban-env-host pulls an unbounded
  ed25519-dalek release that no longer builds; updated the one test
  helper (mint) whose API moved to StellarAssetClient in the process.

On top of getting it building and green, hardened the escrow itself:

- Token transfers (escrow lock, release, refund) now use try_transfer
  and surface the existing-but-unused Error::PaymentFailed instead of
  panicking with an opaque host error on a failed payment.
- The refund event now carries the refunded amount, so deposits,
  releases, and refunds are all auditable on-chain with amounts.
- Added tests for refund-after-deadline, the refund event's amount,
  and that a completed task can no longer be cancelled/refunded out
  from under an already-paid contributor.

All 15 unit tests pass (cargo test).
---
 Documents/Task Bounty/.gitignore        |    2 +
 Documents/Task Bounty/Cargo.lock        | 1875 +++++++++++++++++++++++
 Documents/Task Bounty/Cargo.toml        |    4 +-
 Documents/Task Bounty/src/dispute.rs    |    2 +-
 Documents/Task Bounty/src/events.rs     |    8 +-
 Documents/Task Bounty/src/storage.rs    |   30 +-
 Documents/Task Bounty/src/submission.rs |    9 +-
 Documents/Task Bounty/src/task.rs       |   15 +-
 Documents/Task Bounty/src/test.rs       |  113 +-
 Documents/Task Bounty/src/types.rs      |    4 +-
 10 files changed, 2025 insertions(+), 37 deletions(-)
 create mode 100644 Documents/Task Bounty/Cargo.lock

diff --git a/Documents/Task Bounty/.gitignore b/Documents/Task Bounty/.gitignore
index 783b135..17c3d7e 100644
--- a/Documents/Task Bounty/.gitignore	
+++ b/Documents/Task Bounty/.gitignore	
@@ -1,6 +1,8 @@
 # Compiler files
 cache/
 out/
+target/
+test_snapshots/
 
 # Ignores development broadcast logs
 !/broadcast
diff --git a/Documents/Task Bounty/Cargo.lock b/Documents/Task Bounty/Cargo.lock
new file mode 100644
index 0000000..a53e792
--- /dev/null
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+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5a105cd7b140f6eeec8acff2ea38135d3cab283ada58540f629fe51e46696eb"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fe976fb70c78cd64cccfe3a6fc142244e8a77b70959b30faf9d0ac37ee228eb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c50655cbb0fe3fc43170059e702f1ce5e19b84cec58dc87b037a09935c2f328"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/Documents/Task Bounty/Cargo.toml b/Documents/Task Bounty/Cargo.toml
index a18f696..bfe66b8 100644
--- a/Documents/Task Bounty/Cargo.toml	
+++ b/Documents/Task Bounty/Cargo.toml	
@@ -10,10 +10,10 @@ description = "Decentralized task and reward board on Stellar"
 crate-type = ["cdylib"]
 
 [dependencies]
-soroban-sdk = "21.0.0"
+soroban-sdk = "23"
 
 [dev-dependencies]
-soroban-sdk = { version = "21.0.0", features = ["testutils"] }
+soroban-sdk = { version = "23", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/Documents/Task Bounty/src/dispute.rs b/Documents/Task Bounty/src/dispute.rs
index ddac14b..9e77343 100644
--- a/Documents/Task Bounty/src/dispute.rs	
+++ b/Documents/Task Bounty/src/dispute.rs	
@@ -1,4 +1,4 @@
-use soroban_sdk::{Address, Env, String};
+use soroban_sdk::{panic_with_error, Address, Env, String};
 use crate::types::{Dispute, TaskStatus, SubmissionStatus, Error};
 use crate::storage;
 use crate::events;
diff --git a/Documents/Task Bounty/src/events.rs b/Documents/Task Bounty/src/events.rs
index 5a5c031..438004a 100644
--- a/Documents/Task Bounty/src/events.rs	
+++ b/Documents/Task Bounty/src/events.rs	
@@ -1,4 +1,4 @@
-use soroban_sdk::{Address, Env, String, Symbol, symbol_short};
+use soroban_sdk::{symbol_short, Address, Env, String};
 use crate::types::Task;
 
 /// Emit TaskCreated event
@@ -50,11 +50,11 @@ pub fn emit_submission_rejected(
     );
 }
 
-/// Emit TaskCancelled event
-pub fn emit_task_cancelled(env: &Env, task_id: u64, poster: &Address) {
+/// Emit TaskCancelled event (includes the refunded amount)
+pub fn emit_task_cancelled(env: &Env, task_id: u64, poster: &Address, refunded_amount: i128) {
     env.events().publish(
         (symbol_short!("task"), symbol_short!("cancel")),
-        (task_id, poster.clone()),
+        (task_id, poster.clone(), refunded_amount),
     );
 }
 
diff --git a/Documents/Task Bounty/src/storage.rs b/Documents/Task Bounty/src/storage.rs
index 6d1c5c5..2f861c5 100644
--- a/Documents/Task Bounty/src/storage.rs	
+++ b/Documents/Task Bounty/src/storage.rs	
@@ -1,4 +1,4 @@
-use soroban_sdk::{Address, Env, Vec};
+use soroban_sdk::{symbol_short, Address, Env, Vec};
 use crate::types::{Task, Submission, Dispute};
 
 // Storage keys
@@ -10,39 +10,39 @@ const ADMIN: &str = "ADMIN";
 
 // Task storage
 pub fn get_task(env: &Env, task_id: u64) -> Task {
-    let key = (b"TASK", task_id);
+    let key = (symbol_short!("TASK"), task_id);
     env.storage().persistent().get(&key).unwrap()
 }
 
 pub fn set_task(env: &Env, task: &Task) {
-    let key = (b"TASK", task.id);
+    let key = (symbol_short!("TASK"), task.id);
     env.storage().persistent().set(&key, task);
 }
 
 pub fn task_exists(env: &Env, task_id: u64) -> bool {
-    let key = (b"TASK", task_id);
+    let key = (symbol_short!("TASK"), task_id);
     env.storage().persistent().has(&key)
 }
 
 // Submission storage
 pub fn get_submission(env: &Env, submission_id: u64) -> Submission {
-    let key = (b"SUB", submission_id);
+    let key = (symbol_short!("SUB"), submission_id);
     env.storage().persistent().get(&key).unwrap()
 }
 
 pub fn set_submission(env: &Env, submission: &Submission) {
-    let key = (b"SUB", submission.id);
+    let key = (symbol_short!("SUB"), submission.id);
     env.storage().persistent().set(&key, submission);
 }
 
 pub fn submission_exists(env: &Env, submission_id: u64) -> bool {
-    let key = (b"SUB", submission_id);
+    let key = (symbol_short!("SUB"), submission_id);
     env.storage().persistent().has(&key)
 }
 
 // Task submissions mapping
 pub fn get_task_submissions(env: &Env, task_id: u64) -> Vec<u64> {
-    let key = (b"TASK_SUBS", task_id);
+    let key = (symbol_short!("TASKSUBS"), task_id);
     env.storage()
         .persistent()
         .get(&key)
@@ -50,7 +50,7 @@ pub fn get_task_submissions(env: &Env, task_id: u64) -> Vec<u64> {
 }
 
 pub fn add_task_submission(env: &Env, task_id: u64, submission_id: u64) {
-    let key = (b"TASK_SUBS", task_id);
+    let key = (symbol_short!("TASKSUBS"), task_id);
     let mut submissions = get_task_submissions(env, task_id);
     submissions.push_back(submission_id);
     env.storage().persistent().set(&key, &submissions);
@@ -58,33 +58,33 @@ pub fn add_task_submission(env: &Env, task_id: u64, submission_id: u64) {
 
 // Contributor submission tracking
 pub fn has_contributor_submitted(env: &Env, task_id: u64, contributor: &Address) -> bool {
-    let key = (b"HAS_SUB", task_id, contributor);
+    let key = (symbol_short!("HASSUB"), task_id, contributor);
     env.storage().persistent().has(&key)
 }
 
 pub fn mark_contributor_submitted(env: &Env, task_id: u64, contributor: &Address) {
-    let key = (b"HAS_SUB", task_id, contributor);
+    let key = (symbol_short!("HASSUB"), task_id, contributor);
     env.storage().persistent().set(&key, &true);
 }
 
 // Dispute storage
 pub fn get_dispute(env: &Env, dispute_id: u64) -> Dispute {
-    let key = (b"DISP", dispute_id);
+    let key = (symbol_short!("DISP"), dispute_id);
     env.storage().persistent().get(&key).unwrap()
 }
 
 pub fn set_dispute(env: &Env, dispute: &Dispute) {
-    let key = (b"DISP", dispute.id);
+    let key = (symbol_short!("DISP"), dispute.id);
     env.storage().persistent().set(&key, dispute);
 }
 
 pub fn has_active_dispute(env: &Env, task_id: u64, submission_id: u64) -> bool {
-    let key = (b"DISP_ACT", task_id, submission_id);
+    let key = (symbol_short!("DISPACT"), task_id, submission_id);
     env.storage().persistent().has(&key)
 }
 
 pub fn set_active_dispute(env: &Env, task_id: u64, submission_id: u64, dispute_id: u64) {
-    let key = (b"DISP_ACT", task_id, submission_id);
+    let key = (symbol_short!("DISPACT"), task_id, submission_id);
     env.storage().persistent().set(&key, &dispute_id);
 }
 
diff --git a/Documents/Task Bounty/src/submission.rs b/Documents/Task Bounty/src/submission.rs
index 57f6561..537fb9a 100644
--- a/Documents/Task Bounty/src/submission.rs	
+++ b/Documents/Task Bounty/src/submission.rs	
@@ -1,4 +1,4 @@
-use soroban_sdk::{Address, Env, String, token};
+use soroban_sdk::{panic_with_error, token, Address, Env, String};
 use crate::types::{Submission, SubmissionStatus, TaskStatus, Error};
 use crate::storage;
 use crate::events;
@@ -123,7 +123,12 @@ pub fn approve_submission(
     // Transfer reward to contributor
     let contract_address = env.current_contract_address();
     let token_client = token::Client::new(env, &task.token);
-    token_client.transfer(&contract_address, &submission.contributor, &task.reward);
+    if token_client
+        .try_transfer(&contract_address, &submission.contributor, &task.reward)
+        .is_err()
+    {
+        panic_with_error!(env, Error::PaymentFailed);
+    }
 
     // Emit event
     events::emit_submission_approved(
diff --git a/Documents/Task Bounty/src/task.rs b/Documents/Task Bounty/src/task.rs
index b37b85e..e194496 100644
--- a/Documents/Task Bounty/src/task.rs	
+++ b/Documents/Task Bounty/src/task.rs	
@@ -1,4 +1,4 @@
-use soroban_sdk::{Address, Env, String, token};
+use soroban_sdk::{panic_with_error, token, Address, Env, String};
 use crate::types::{Task, TaskStatus, Error};
 use crate::storage;
 use crate::events;
@@ -38,7 +38,9 @@ pub fn create_task(
     // Transfer reward to contract (escrow)
     let contract_address = env.current_contract_address();
     let token_client = token::Client::new(env, &token);
-    token_client.transfer(&poster, &contract_address, &reward);
+    if token_client.try_transfer(&poster, &contract_address, &reward).is_err() {
+        panic_with_error!(env, Error::PaymentFailed);
+    }
 
     // Create task
     let task_id = storage::increment_task_counter(env);
@@ -100,8 +102,13 @@ pub fn cancel_task(env: &Env, task_id: u64, poster: Address) {
     // Refund poster
     let contract_address = env.current_contract_address();
     let token_client = token::Client::new(env, &task.token);
-    token_client.transfer(&contract_address, &poster, &task.reward);
+    if token_client
+        .try_transfer(&contract_address, &poster, &task.reward)
+        .is_err()
+    {
+        panic_with_error!(env, Error::PaymentFailed);
+    }
 
     // Emit event
-    events::emit_task_cancelled(env, task_id, &poster);
+    events::emit_task_cancelled(env, task_id, &poster, task.reward);
 }
diff --git a/Documents/Task Bounty/src/test.rs b/Documents/Task Bounty/src/test.rs
index 38dc888..7264cc3 100644
--- a/Documents/Task Bounty/src/test.rs	
+++ b/Documents/Task Bounty/src/test.rs	
@@ -2,8 +2,9 @@
 
 use super::*;
 use soroban_sdk::{
-    testutils::{Address as _, Ledger, LedgerInfo},
-    token, Address, Env, String,
+    symbol_short,
+    testutils::{Address as _, Events as _, Ledger},
+    token, Address, Env, IntoVal, String,
 };
 use types::{TaskStatus, SubmissionStatus};
 
@@ -22,7 +23,7 @@ fn setup_test() -> (Env, Address, Address, Address, token::Client<'static>, Addr
     let token_client = create_token_contract(&env, &admin);
 
     // Mint tokens to poster
-    token_client.mint(&poster, &10_000_000_000); // 1000 XLM
+    token::StellarAssetClient::new(&env, &token_client.address).mint(&poster, &10_000_000_000); // 1000 XLM
 
     // Deploy contract
     let contract_id = env.register_contract(None, TaskBountyContract);
@@ -67,7 +68,7 @@ fn test_create_task() {
 }
 
 #[test]
-#[should_panic(expected = "InsufficientReward")]
+#[should_panic(expected = "Error(Contract, #7)")] // InsufficientReward
 fn test_create_task_insufficient_reward() {
     let (env, poster, _, _, token_client, contract_id) = setup_test();
     let client = TaskBountyContractClient::new(&env, &contract_id);
@@ -89,11 +90,16 @@ fn test_create_task_insufficient_reward() {
 }
 
 #[test]
-#[should_panic(expected = "InvalidDeadline")]
+#[should_panic(expected = "Error(Contract, #8)")] // InvalidDeadline
 fn test_create_task_past_deadline() {
     let (env, poster, _, _, token_client, contract_id) = setup_test();
     let client = TaskBountyContractClient::new(&env, &contract_id);
 
+    // Advance the ledger first so "now - 1" can't underflow a fresh env's zero timestamp.
+    env.ledger().with_mut(|li| {
+        li.timestamp = 100_000;
+    });
+
     let title = String::from_str(&env, "Task");
     let description = String::from_str(&env, "Description");
     let reward = 10_000_000;
@@ -147,7 +153,7 @@ fn test_submit_work() {
 }
 
 #[test]
-#[should_panic(expected = "AlreadySubmitted")]
+#[should_panic(expected = "Error(Contract, #10)")] // AlreadySubmitted
 fn test_submit_work_twice() {
     let (env, poster, contributor, _, token_client, contract_id) = setup_test();
     let client = TaskBountyContractClient::new(&env, &contract_id);
@@ -170,7 +176,7 @@ fn test_submit_work_twice() {
 }
 
 #[test]
-#[should_panic(expected = "TaskExpired")]
+#[should_panic(expected = "Error(Contract, #4)")] // TaskExpired
 fn test_submit_work_expired() {
     let (env, poster, contributor, _, token_client, contract_id) = setup_test();
     let client = TaskBountyContractClient::new(&env, &contract_id);
@@ -303,6 +309,99 @@ fn test_cancel_task() {
     assert_eq!(task.status, TaskStatus::Cancelled);
 }
 
+#[test]
+fn test_cancel_task_emits_refund_event_with_amount() {
+    let (env, poster, _, _, token_client, contract_id) = setup_test();
+    let client = TaskBountyContractClient::new(&env, &contract_id);
+
+    let reward = 10_000_000;
+    let task_id = client.create_task(
+        &poster,
+        &String::from_str(&env, "Task"),
+        &String::from_str(&env, "Description"),
+        &token_client.address,
+        &reward,
+        &(env.ledger().timestamp() + 86400),
+        &1,
+    );
+
+    client.cancel_task(&task_id, &poster);
+
+    let events = env.events().all();
+    let (_contract, topics, data) = events.last().unwrap();
+    assert_eq!(
+        topics,
+        (symbol_short!("task"), symbol_short!("cancel")).into_val(&env)
+    );
+    let (event_task_id, event_poster, refunded_amount): (u64, Address, i128) =
+        data.into_val(&env);
+    assert_eq!(event_task_id, task_id);
+    assert_eq!(event_poster, poster);
+    assert_eq!(refunded_amount, reward);
+}
+
+#[test]
+fn test_cancel_task_after_deadline_still_refunds() {
+    let (env, poster, _, _, token_client, contract_id) = setup_test();
+    let client = TaskBountyContractClient::new(&env, &contract_id);
+
+    let reward = 10_000_000;
+    let poster_balance_before = token_client.balance(&poster);
+
+    let task_id = client.create_task(
+        &poster,
+        &String::from_str(&env, "Task"),
+        &String::from_str(&env, "Description"),
+        &token_client.address,
+        &reward,
+        &(env.ledger().timestamp() + 86400),
+        &1,
+    );
+
+    // Fast forward past the deadline without any approved submission.
+    env.ledger().with_mut(|li| {
+        li.timestamp += 86_401;
+    });
+
+    client.cancel_task(&task_id, &poster);
+
+    let poster_balance_after = token_client.balance(&poster);
+    assert_eq!(poster_balance_after, poster_balance_before);
+
+    let task = client.get_task(&task_id);
+    assert_eq!(task.status, TaskStatus::Cancelled);
+}
+
+#[test]
+#[should_panic(expected = "Error(Contract, #5)")] // InvalidTaskStatus
+fn test_cancel_task_after_approval_fails() {
+    let (env, poster, contributor, _, token_client, contract_id) = setup_test();
+    let client = TaskBountyContractClient::new(&env, &contract_id);
+
+    let task_id = client.create_task(
+        &poster,
+        &String::from_str(&env, "Task"),
+        &String::from_str(&env, "Description"),
+        &token_client.address,
+        &10_000_000,
+        &(env.ledger().timestamp() + 86400),
+        &1,
+    );
+
+    let submission_id = client.submit_work(
+        &task_id,
+        &contributor,
+        &String::from_str(&env, "ipfs://QmXxxx"),
+        &String::from_str(&env, "Work"),
+    );
+
+    client.approve_submission(&task_id, &submission_id, &poster);
+
+    // Reward has already been released to the contributor; the poster can no
+    // longer cancel and pull a refund out from under them.
+    client.cancel_task(&task_id, &poster);
+}
+
 #[test]
 fn test_raise_dispute() {
     let (env, poster, contributor, _, token_client, contract_id) = setup_test();
diff --git a/Documents/Task Bounty/src/types.rs b/Documents/Task Bounty/src/types.rs
index 05e40d6..9162330 100644
--- a/Documents/Task Bounty/src/types.rs	
+++ b/Documents/Task Bounty/src/types.rs	
@@ -1,4 +1,4 @@
-use soroban_sdk::{contracttype, Address, String};
+use soroban_sdk::{contracterror, contracttype, Address, String};
 
 /// Task status enum
 #[contracttype]
@@ -63,7 +63,7 @@ pub struct Dispute {
 }
 
 /// Error codes
-#[contracttype]
+#[contracterror]
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 #[repr(u32)]
 pub enum Error {