solana: example ccip sender

chains/solana/contracts/Anchor.toml

@@ -28,6 +28,7 @@ ccip_router = "C8WSPj3yyus1YN3yNB6YA5zStYtbjQWtpmKadmvyUXq8"
 mcm = "6UmMZr5MEqiKWD5jqTJd1WCR5kT8oZuFYBLJFi1o6GQX"
 timelock = "LoCoNsJFuhTkSQjfdDfn3yuwqhSYoPujmviRHVCzsqn"
 token_pool = "GRvFSLwR7szpjgNEZbGe4HtxfJYXqySXuuRUAJDpu4WH"
+example_ccip_sender = "CcipSender111111111111111111111111111111111"
 example_ccip_receiver = "CcipReceiver1111111111111111111111111111111"
 test_ccip_receiver = "CtEVnHsQzhTNWav8skikiV2oF6Xx7r7uGGa8eCDQtTjH"
 test_ccip_invalid_receiver = "9Vjda3WU2gsJgE4VdU6QuDw8rfHLyigfFyWs3XDPNUn8"

chains/solana/contracts/programs/example-ccip-receiver/Cargo.toml

@@ -14,7 +14,6 @@ no-idl = []
 no-log-ix-name = []
 cpi = ["no-entrypoint"]
 default = []
-idel-build = ["anchor-lang/idl-build"]
 
 [dependencies]
 solana-program = "1.17.25" # pin solana to 1.17

chains/solana/contracts/programs/example-ccip-sender/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "example_ccip_sender"
+version = "0.1.0-dev"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "example_ccip_sender"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+solana-program = "1.17.25" # pin solana to 1.17
+anchor-lang = { version = "0.29.0", features = [] }
+anchor-spl = "0.29.0"

chains/solana/contracts/programs/example-ccip-sender/Xargo.toml

@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

chains/solana/contracts/programs/example-ccip-sender/src/lib.rs

@@ -0,0 +1,325 @@
+use anchor_lang::prelude::*;
+use anchor_spl::token_interface::{Mint, TokenAccount};
+
+declare_id!("CcipSender111111111111111111111111111111111");
+
+pub const EXTERNAL_EXECUTION_CONFIG_SEED: &[u8] = b"external_execution_config";
+pub const APPROVED_SENDER_SEED: &[u8] = b"approved_ccip_sender";
+pub const TOKEN_ADMIN_SEED: &[u8] = b"receiver_token_admin";
+
+/// This program an example of a CCIP Receiver Program.
+/// Used to test CCIP Router execute.
+#[program]
+pub mod example_ccip_receiver {
+    use anchor_spl::token_2022::spl_token_2022::{self, instruction::transfer_checked};
+    use solana_program::program::invoke_signed;
+
+    use super::*;
+
+    /// The initialization is responsibility of the External User, CCIP is not handling initialization of Accounts
+    pub fn initialize(ctx: Context<Initialize>, router: Pubkey) -> Result<()> {
+        ctx.accounts
+            .state
+            .init(ctx.accounts.authority.key(), router)
+    }
+
+    pub fn ccip_send(_ctx: Context<CcipReceive>, _message: Any2SVMMessage) -> Result<()> {
+        // TODO
+        Ok(())
+    }
+
+    pub fn update_router(ctx: Context<UpdateConfig>, new_router: Pubkey) -> Result<()> {
+        ctx.accounts
+            .state
+            .update_router(ctx.accounts.authority.key(), new_router)
+    }
+
+    pub fn transfer_ownership(ctx: Context<UpdateConfig>, proposed_owner: Pubkey) -> Result<()> {
+        ctx.accounts
+            .state
+            .transfer_ownership(ctx.accounts.authority.key(), proposed_owner)
+    }
+
+    pub fn accept_ownership(ctx: Context<AcceptOwnership>) -> Result<()> {
+        ctx.accounts
+            .state
+            .accept_ownership(ctx.accounts.authority.key())
+    }
+
+    pub fn withdraw_tokens(ctx: Context<WithdrawTokens>, amount: u64, decimals: u8) -> Result<()> {
+        let mut ix = transfer_checked(
+            &spl_token_2022::ID, // use spl-token-2022 to compile instruction - change program later
+            &ctx.accounts.program_token_account.key(),
+            &ctx.accounts.mint.key(),
+            &ctx.accounts.to_token_account.key(),
+            &ctx.accounts.token_admin.key(),
+            &[],
+            amount,
+            decimals,
+        )?;
+        ix.program_id = ctx.accounts.token_program.key(); // set to user specified program
+
+        let seeds = &[TOKEN_ADMIN_SEED, &[ctx.bumps.token_admin]];
+        invoke_signed(
+            &ix,
+            &[
+                ctx.accounts.program_token_account.to_account_info(),
+                ctx.accounts.mint.to_account_info(),
+                ctx.accounts.to_token_account.to_account_info(),
+                ctx.accounts.token_admin.to_account_info(),
+            ],
+            &[&seeds[..]],
+        )?;
+        Ok(())
+    }
+}
+
+const ANCHOR_DISCRIMINATOR: usize = 8;
+
+#[derive(Accounts, Debug)]
+pub struct Initialize<'info> {
+    #[account(
+        init,
+        seeds = [b"state"],
+        bump,
+        payer = authority,
+        space = ANCHOR_DISCRIMINATOR + BaseState::INIT_SPACE,
+    )]
+    pub state: Account<'info, BaseState>,
+    #[account(
+        init,
+        seeds = [TOKEN_ADMIN_SEED],
+        bump,
+        payer = authority,
+        space = ANCHOR_DISCRIMINATOR,
+    )]
+    /// CHECK: CPI signer for tokens
+    pub token_admin: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub authority: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
+
+#[derive(Accounts, Debug)]
+#[instruction(message: Any2SVMMessage)]
+pub struct CcipReceive<'info> {
+    // router CPI signer must be first
+    #[account(
+        constraint = state.is_router(authority.key()) @ CcipReceiverError::OnlyRouter,
+    )]
+    pub authority: Signer<'info>,
+    #[account(
+        seeds = [
+            APPROVED_SENDER_SEED,
+            message.source_chain_selector.to_le_bytes().as_ref(),
+            &[message.sender.len() as u8],
+            &message.sender,
+        ],
+        bump,
+    )]
+    pub approved_sender: Account<'info, ApprovedSender>, // if PDA does not exist, the message sender and/or source chain are not approved
+    pub state: Account<'info, BaseState>,
+}
+
+#[derive(Accounts, Debug)]
+pub struct UpdateConfig<'info> {
+    #[account(
+        mut,
+        seeds = [b"state"],
+        bump,
+    )]
+    pub state: Account<'info, BaseState>,
+    #[account(
+        address = state.owner @ CcipReceiverError::OnlyOwner,
+    )]
+    pub authority: Signer<'info>,
+}
+
+#[derive(Accounts, Debug)]
+pub struct AcceptOwnership<'info> {
+    #[account(
+        mut,
+        seeds = [b"state"],
+        bump,
+    )]
+    pub state: Account<'info, BaseState>,
+    #[account(
+        address = state.proposed_owner @ CcipReceiverError::OnlyProposedOwner,
+    )]
+    pub authority: Signer<'info>,
+}
+
+#[derive(Accounts, Debug)]
+pub struct WithdrawTokens<'info> {
+    #[account(
+        mut,
+        seeds = [b"state"],
+        bump,
+    )]
+    pub state: Account<'info, BaseState>,
+    #[account(
+        mut,
+        token::mint = mint,
+        token::authority = token_admin,
+        token::token_program = token_program,
+    )]
+    pub program_token_account: InterfaceAccount<'info, TokenAccount>,
+    #[account(
+        mut,
+        token::mint = mint,
+        token::token_program = token_program,
+    )]
+    pub to_token_account: InterfaceAccount<'info, TokenAccount>,
+    pub mint: InterfaceAccount<'info, Mint>,
+    #[account(address = *mint.to_account_info().owner)]
+    /// CHECK: CPI to token program
+    pub token_program: AccountInfo<'info>,
+    #[account(
+        seeds = [TOKEN_ADMIN_SEED],
+        bump,
+    )]
+    /// CHECK: CPI signer for tokens
+    pub token_admin: UncheckedAccount<'info>,
+    #[account(
+        address = state.owner @ CcipReceiverError::OnlyOwner,
+    )]
+    pub authority: Signer<'info>,
+}
+
+// BaseState contains the state for core safety checks that can be leveraged by the implementer
+// Base state contains a limited size allow and deny list
+// Both are included to handle the size limitations on solana
+// If user wants to allow a small number of chains, consider using the allow list (disable deny list)
+// If user wants to allow many chains, consider using the deny list (disable allow list)
+#[account]
+#[derive(InitSpace, Default, Debug)]
+pub struct BaseState {
+    pub owner: Pubkey,
+    pub proposed_owner: Pubkey,
+
+    pub router: Pubkey,
+}
+
+impl BaseState {
+    pub fn init(&mut self, owner: Pubkey, router: Pubkey) -> Result<()> {
+        require_eq!(self.owner, Pubkey::default());
+        self.owner = owner;
+        self.update_router(owner, router)
+    }
+
+    pub fn transfer_ownership(&mut self, owner: Pubkey, proposed_owner: Pubkey) -> Result<()> {
+        require_eq!(self.owner, owner, CcipReceiverError::OnlyOwner);
+        self.proposed_owner = proposed_owner;
+        Ok(())
+    }
+
+    pub fn accept_ownership(&mut self, proposed_owner: Pubkey) -> Result<()> {
+        require_eq!(
+            self.proposed_owner,
+            proposed_owner,
+            CcipReceiverError::OnlyProposedOwner
+        );
+        self.proposed_owner = Pubkey::default();
+        self.owner = proposed_owner;
+        Ok(())
+    }
+
+    pub fn is_router(&self, caller: Pubkey) -> bool {
+        Pubkey::find_program_address(&[EXTERNAL_EXECUTION_CONFIG_SEED], &self.router).0 == caller
+    }
+
+    pub fn update_router(&mut self, owner: Pubkey, router: Pubkey) -> Result<()> {
+        require_keys_neq!(router, Pubkey::default(), CcipReceiverError::InvalidRouter);
+        require_eq!(self.owner, owner, CcipReceiverError::OnlyOwner);
+        self.router = router;
+        Ok(())
+    }
+}
+
+#[account]
+#[derive(InitSpace, Default, Debug)]
+pub struct ApprovedSender {}
+
+#[derive(Debug, Clone, AnchorSerialize, AnchorDeserialize)]
+pub struct Any2SVMMessage {
+    pub message_id: [u8; 32],
+    pub source_chain_selector: u64,
+    pub sender: Vec<u8>,
+    pub data: Vec<u8>,
+    pub token_amounts: Vec<SVMTokenAmount>,
+}
+
+#[derive(Debug, Clone, AnchorSerialize, AnchorDeserialize, Default)]
+pub struct SVMTokenAmount {
+    pub token: Pubkey,
+    pub amount: u64, // solana local token amount
+}
+
+#[error_code]
+pub enum CcipReceiverError {
+    #[msg("Address is not router external execution PDA")]
+    OnlyRouter,
+    #[msg("Invalid router address")]
+    InvalidRouter,
+    #[msg("Invalid combination of chain and sender")]
+    InvalidChainAndSender,
+    #[msg("Address is not owner")]
+    OnlyOwner,
+    #[msg("Address is not proposed_owner")]
+    OnlyProposedOwner,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn create_state() -> BaseState {
+        BaseState {
+            owner: Pubkey::new_unique(),
+            ..BaseState::default()
+        }
+    }
+
+    #[test]
+    fn ownership() {
+        let mut state = create_state();
+        let next_owner = Pubkey::new_unique();
+
+        // only owner can propose
+        assert_eq!(
+            state
+                .transfer_ownership(Pubkey::new_unique(), Pubkey::new_unique())
+                .unwrap_err(),
+            CcipReceiverError::OnlyOwner.into()
+        );
+        state.transfer_ownership(state.owner, next_owner).unwrap();
+
+        // only proposed_owner can accept
+        assert_eq!(
+            state.accept_ownership(Pubkey::new_unique()).unwrap_err(),
+            CcipReceiverError::OnlyProposedOwner.into(),
+        );
+        state.accept_ownership(next_owner).unwrap();
+    }
+
+    #[test]
+    fn router() {
+        let mut state = create_state();
+
+        assert_eq!(
+            state
+                .update_router(state.owner, Pubkey::default())
+                .unwrap_err(),
+            CcipReceiverError::InvalidRouter.into(),
+        );
+        assert_eq!(
+            state
+                .update_router(Pubkey::new_unique(), Pubkey::new_unique())
+                .unwrap_err(),
+            CcipReceiverError::OnlyOwner.into(),
+        );
+        state
+            .update_router(state.owner, Pubkey::new_unique())
+            .unwrap();
+    }
+}