[stake-pool] instruction to add metadata for pool token (#3335)

* instruction to add metadata for pool token

* add documentation for instruction accounts

* address pull request comments

* added more tests for update pool token instruction

* add check for payer signature

stake-pool/program/Cargo.toml

@@ -14,6 +14,7 @@ test-bpf = []
 [dependencies]
 arrayref = "0.3.6"
 borsh = "0.9"
+mpl-token-metadata =  { version = "1.3.1", features = [ "no-entrypoint" ] }
 num-derive = "0.3"
 num-traits = "0.2"
 num_enum = "0.5.4"

stake-pool/program/src/error.rs

@@ -132,6 +132,9 @@ pub enum StakePoolError {
     /// Too much SOL withdrawn from the stake pool's reserve account
     #[error("SolWithdrawalTooLarge")]
     SolWithdrawalTooLarge,
+    /// Provided metadata account does not match metadata account derived for pool mint
+    #[error("InvalidMetadataAccount")]
+    InvalidMetadataAccount,
 }
 impl From<StakePoolError> for ProgramError {
     fn from(e: StakePoolError) -> Self {

stake-pool/program/src/instruction.rs

@@ -1,6 +1,7 @@
 //! Instruction types
 
 #![allow(clippy::too_many_arguments)]
+
 use {
     crate::{
         find_deposit_authority_program_address, find_stake_program_address,
@@ -9,6 +10,7 @@ use {
         MAX_VALIDATORS_TO_UPDATE,
     },
     borsh::{BorshDeserialize, BorshSchema, BorshSerialize},
+    mpl_token_metadata::pda::find_metadata_account,
     solana_program::{
         instruction::{AccountMeta, Instruction},
         pubkey::Pubkey,
@@ -374,6 +376,48 @@ pub enum StakePoolInstruction {
     ///  11. `[]` Token program id
     ///  12. `[s]` (Optional) Stake pool sol withdraw authority
     WithdrawSol(u64),
+
+    /// Create token metadata for the stake-pool token in the
+    /// metaplex-token program
+    /// 0. `[]` Stake pool
+    /// 1. `[s]` Manager
+    /// 2. `[]` Stake pool withdraw authority
+    /// 3. `[]` Pool token mint account
+    /// 4. `[s, w]` Payer for creation of token metadata account
+    /// 5. `[w]` Token metadata account
+    /// 6. `[]` Metadata program id
+    /// 7. `[]` System program id
+    /// 8. `[]` Rent sysvar
+    CreateTokenMetadata {
+        #[allow(dead_code)]
+        /// Token name
+        name: String,
+        #[allow(dead_code)]
+        /// Token symbol e.g. stkSOL
+        symbol: String,
+        /// URI of the uploaded metadata of the spl-token
+        #[allow(dead_code)]
+        uri: String,
+    },
+    /// Update token metadata for the stake-pool token in the
+    /// metaplex-token program
+    ///
+    /// 0. `[]` Stake pool
+    /// 1. `[s]` Manager
+    /// 2. `[]` Stake pool withdraw authority
+    /// 3. `[w]` Token metadata account
+    /// 4. `[]` Metadata program id
+    UpdateTokenMetadata {
+        #[allow(dead_code)]
+        /// Token name
+        name: String,
+        #[allow(dead_code)]
+        /// Token symbol e.g. stkSOL
+        symbol: String,
+        /// URI of the uploaded metadata of the spl-token
+        #[allow(dead_code)]
+        uri: String,
+    },
 }
 
 /// Creates an 'initialize' instruction.
@@ -1276,3 +1320,72 @@ pub fn set_funding_authority(
             .unwrap(),
     }
 }
+
+/// Creates an instruction to update metadata in the mpl token metadata program account for
+/// the pool token
+pub fn update_token_metadata(
+    program_id: &Pubkey,
+    stake_pool: &Pubkey,
+    manager: &Pubkey,
+    pool_mint: &Pubkey,
+    name: String,
+    symbol: String,
+    uri: String,
+) -> Instruction {
+    let (stake_pool_withdraw_authority, _) =
+        find_withdraw_authority_program_address(program_id, stake_pool);
+    let (token_metadata, _) = find_metadata_account(pool_mint);
+
+    let accounts = vec![
+        AccountMeta::new_readonly(*stake_pool, false),
+        AccountMeta::new_readonly(*manager, true),
+        AccountMeta::new_readonly(stake_pool_withdraw_authority, false),
+        AccountMeta::new(token_metadata, false),
+        AccountMeta::new_readonly(mpl_token_metadata::id(), false),
+    ];
+
+    Instruction {
+        program_id: *program_id,
+        accounts,
+        data: StakePoolInstruction::UpdateTokenMetadata { name, symbol, uri }
+            .try_to_vec()
+            .unwrap(),
+    }
+}
+
+/// Creates an instruction to create metadata using the mpl token metadata program for
+/// the pool token
+pub fn create_token_metadata(
+    program_id: &Pubkey,
+    stake_pool: &Pubkey,
+    manager: &Pubkey,
+    pool_mint: &Pubkey,
+    payer: &Pubkey,
+    name: String,
+    symbol: String,
+    uri: String,
+) -> Instruction {
+    let (stake_pool_withdraw_authority, _) =
+        find_withdraw_authority_program_address(program_id, stake_pool);
+    let (token_metadata, _) = find_metadata_account(pool_mint);
+
+    let accounts = vec![
+        AccountMeta::new_readonly(*stake_pool, false),
+        AccountMeta::new_readonly(*manager, true),
+        AccountMeta::new_readonly(stake_pool_withdraw_authority, false),
+        AccountMeta::new_readonly(*pool_mint, false),
+        AccountMeta::new(*payer, true),
+        AccountMeta::new(token_metadata, false),
+        AccountMeta::new_readonly(mpl_token_metadata::id(), false),
+        AccountMeta::new_readonly(system_program::id(), false),
+        AccountMeta::new_readonly(sysvar::rent::id(), false),
+    ];
+
+    Instruction {
+        program_id: *program_id,
+        accounts,
+        data: StakePoolInstruction::CreateTokenMetadata { name, symbol, uri }
+            .try_to_vec()
+            .unwrap(),
+    }
+}