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Showing content from https://github.com/r4topunk/cosmwasm-ai-delegated-spend below:

GitHub - r4topunk/cosmwasm-ai-delegated-spend

This contract implements a secure, modular delegated spending system for Cosmos blockchains using CosmWasm. It allows users to deposit credits, authorize spenders, and delegate spending rights, following best practices for security, modularity, and extensibility.

• Secure Deposit System: Users can deposit native tokens to their account balance
• Delegation Control: Token owners can authorize and revoke spending rights for other addresses
• Spend On Behalf: Authorized spenders can spend from owner accounts
• Balance Queries: Check user's current credit balance
• Authorization Verification: Verify if a spender is authorized by an owner

• State Management: Tracks admin, token denomination, user balances, and authorized spenders
• Message Handling: Processes instantiation, execution, and query requests
• Access Control: Implements permission validation for spending operations

• instantiate: Initializes the contract with an admin address and token denomination
• execute: Processes deposit, authorization, revocation, and spending operations
• query: Provides information about balances and authorization status

• InstantiateMsg: Sets contract admin and the native token denomination used

• Deposit: Adds deposited funds to user's balance
• AuthorizeSpender: Grants spending permission to another address
• RevokeSpender: Removes spending permission from an address
• SpendFrom: Allows spending tokens from an owner's account (if authorized)

• Balance: Returns the token balance of a specified address
• IsAuthorized: Checks if a spender is authorized by an owner

// Create a new contract instance with an admin and the accepted token denomination
let instantiate_msg = InstantiateMsg {
    admin: "cosmos1...".to_string(),
    denom: "uatom".to_string(),
};

// User deposits tokens by sending them with the Deposit message
let execute_msg = ExecuteMsg::Deposit {};

// Owner authorizes another address to spend on their behalf
let execute_msg = ExecuteMsg::AuthorizeSpender {
    spender: "cosmos2...".to_string(),
};

// Authorized spender spends tokens from owner's account
let execute_msg = ExecuteMsg::SpendFrom {
    owner: "cosmos1...".to_string(),
    amount: 100u128,
};

• All user inputs are validated using Cosmos SDK's address validation
• Authorization checks prevent unauthorized spending
• Balance validation ensures sufficient funds before spending

• Rust 1.65.0+
• wasmd for local testing
• cargo-make for build scripts

• Deposit: Users can deposit native tokens to their balance.
• Authorize/Revoke Spender: Users can grant or revoke permission for other accounts to spend on their behalf.
• Delegated Spend: Authorized spenders can transfer credits from the owner's balance.
• Balance & Authorization Queries: Query balances and authorization status.

contract/
  exec.rs         # Execution logic (deposit, authorize, revoke, spend)
  init.rs         # Initialization logic
  mod.rs          # Public contract interface
  query.rs        # Query logic
error.rs          # Custom error type
lib.rs            # Crate entrypoint
msg/
  exec.rs         # ExecuteMsg definitions
  init.rs         # InstantiateMsg definition
  query.rs        # QueryMsg definitions
schema.rs         # JSON schema generator
state.rs          # State storage (admin, denom, balances, authorizations)
tests_integration.rs # Integration tests (cw-multi-test)
Cargo.toml        # Dependencies

• Strict access control and input validation
• No reentrancy or unchecked math
• Uses only audited dependencies
• Modular, maintainable code

cargo wasm && wasm-opt -Oz -o contract.wasm target/wasm32-unknown-unknown/release/credits_delegation.wasm

See tests_integration.rs for a full deposit, authorization, and spend flow.

MIT

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