Add libray_api (#5304)

Simple move-based payment api

programs/librapay_api/src/librapay_instruction.rs

@@ -0,0 +1,89 @@
+use bincode;
+use solana_move_loader_api::account_state::pubkey_to_address;
+use solana_move_loader_api::processor::InvokeInfo;
+use solana_sdk::instruction::{AccountMeta, Instruction};
+use solana_sdk::loader_instruction::LoaderInstruction;
+use solana_sdk::pubkey::Pubkey;
+use types::account_address::AccountAddress;
+use types::transaction::TransactionArgument;
+
+pub fn mint(
+    program_id: &Pubkey,
+    from_pubkey: &Pubkey,
+    to_pubkey: &Pubkey,
+    microlibras: u64,
+) -> Instruction {
+    let args = vec![
+        TransactionArgument::Address(pubkey_to_address(to_pubkey)),
+        TransactionArgument::U64(microlibras),
+    ];
+
+    let invoke_info = InvokeInfo {
+        sender_address: AccountAddress::default(),
+        function_name: "main".to_string(),
+        args,
+    };
+    let data = bincode::serialize(&invoke_info).unwrap();
+    let ix_data = LoaderInstruction::InvokeMain { data };
+
+    let accounts = vec![
+        AccountMeta::new_credit_only(*program_id, false),
+        AccountMeta::new(*from_pubkey, true),
+        AccountMeta::new(*to_pubkey, false),
+    ];
+
+    Instruction::new(solana_move_loader_api::id(), &ix_data, accounts)
+}
+
+pub fn transfer(
+    program_id: &Pubkey,
+    mint_pubkey: &Pubkey,
+    from_pubkey: &Pubkey,
+    to_pubkey: &Pubkey,
+    microlibras: u64,
+) -> Instruction {
+    let args = vec![
+        TransactionArgument::Address(pubkey_to_address(to_pubkey)),
+        TransactionArgument::U64(microlibras),
+    ];
+
+    let invoke_info = InvokeInfo {
+        sender_address: pubkey_to_address(from_pubkey),
+        function_name: "main".to_string(),
+        args,
+    };
+    let data = bincode::serialize(&invoke_info).unwrap();
+    let ix_data = LoaderInstruction::InvokeMain { data };
+
+    let accounts = vec![
+        AccountMeta::new_credit_only(*program_id, false),
+        AccountMeta::new_credit_only(*mint_pubkey, false),
+        AccountMeta::new(*from_pubkey, true),
+        AccountMeta::new(*to_pubkey, false),
+    ];
+
+    Instruction::new(solana_move_loader_api::id(), &ix_data, accounts)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_pay() {
+        let from = Pubkey::new_rand();
+        let to = Pubkey::new_rand();
+        let program_id = Pubkey::new_rand();
+        let mint_id = Pubkey::new_rand();
+        transfer(&program_id, &mint_id, &from, &to, 1);
+    }
+
+    #[test]
+    fn test_mint() {
+        let program_id = Pubkey::new_rand();
+        let from = Pubkey::new_rand();
+        let to = Pubkey::new_rand();
+
+        mint(&program_id, &from, &to, 1);
+    }
+}