token collections: create spec program

Cargo.toml

@@ -42,6 +42,7 @@ members = [
   "stake-pool/cli",
   "stake-pool/program",
   "stateless-asks/program",
+  "token-collections/program",
   "token-group/example",
   "token-group/interface",
   "token-lending/cli",

token-collections/README.md

@@ -0,0 +1,24 @@
+# SPL Token Collections
+
+This program serves as a reference implementation for using the SPL Token Group
+interface to create an on-chain program for managing token collections - such
+as NFT Collections.
+
+This program bears a lot of similarity to the example program found at
+`token-group/example`, but with some additional implementations centered around
+specifically token collections.
+
+## How Collections Work in this Program
+
+Strictly for demonstration purposes, this program is going to require the
+following:
+
+- Group tokens must be NFTs (0 decimals, 1 supply)
+- Group tokens must have metadata
+- Member tokens can be any SPL token, but must have metadata
+- Member tokens can be part of multiple collections
+
+## Demonstration
+
+For a particularly fleshed-out example of this program in action, check out the
+`token-collections.rs` test under `tests`!

token-collections/program/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "spl-token-collections"
+version = "0.1.0"
+description = "Solana Program Library Token Collections"
+authors = ["Solana Labs Maintainers <[email protected]>"]
+repository = "https://github.com/solana-labs/solana-program-library"
+license = "Apache-2.0"
+edition = "2021"
+
+[features]
+no-entrypoint = []
+test-sbf = []
+
+[dependencies]
+solana-program = "1.16.16"
+spl-pod = { version = "0.1.0", path = "../../libraries/pod" }
+spl-program-error = { version = "0.3.0" , path = "../../libraries/program-error" }
+spl-token-2022 = { version = "0.9.0", path = "../../token/program-2022", features = ["no-entrypoint"] }
+spl-token-group-interface = { version = "0.1.0", path = "../../token-group/interface" }
+spl-token-metadata-interface = { version = "0.2", path = "../../token-metadata/interface" }
+spl-type-length-value = { version = "0.3.0", path = "../../libraries/type-length-value" }
+
+[dev-dependencies]
+solana-program-test = "1.16.16"
+solana-sdk = "1.16.16"
+spl-discriminator = { version = "0.1.0", path = "../../libraries/discriminator" }
+spl-token-client = { version = "0.7", path = "../../token/client" }
+
+[lib]
+crate-type = ["cdylib", "lib"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]

token-collections/program/src/entrypoint.rs

@@ -0,0 +1,23 @@
+//! Program entrypoint
+
+use {
+    crate::processor,
+    solana_program::{
+        account_info::AccountInfo, entrypoint, entrypoint::ProgramResult,
+        program_error::PrintProgramError, pubkey::Pubkey,
+    },
+    spl_token_group_interface::error::TokenGroupError,
+};
+
+entrypoint!(process_instruction);
+fn process_instruction(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    instruction_data: &[u8],
+) -> ProgramResult {
+    if let Err(error) = processor::process(program_id, accounts, instruction_data) {
+        error.print::<TokenGroupError>();
+        return Err(error);
+    }
+    Ok(())
+}

token-collections/program/src/lib.rs

@@ -0,0 +1,10 @@
+//! Crate defining the Token Collections program implementing the
+//! SPL Token Group interface.
+
+#![deny(missing_docs)]
+#![cfg_attr(not(test), forbid(unsafe_code))]
+
+pub mod processor;
+
+#[cfg(not(feature = "no-entrypoint"))]
+mod entrypoint;

token-collections/program/src/processor.rs

@@ -0,0 +1,201 @@
+//! Program state processor
+
+use {
+    solana_program::{
+        account_info::{next_account_info, AccountInfo},
+        entrypoint::ProgramResult,
+        msg,
+        program_error::ProgramError,
+        program_option::COption,
+        pubkey::Pubkey,
+    },
+    spl_pod::optional_keys::OptionalNonZeroPubkey,
+    spl_token_2022::{
+        extension::{
+            metadata_pointer::MetadataPointer, BaseStateWithExtensions, StateWithExtensions,
+        },
+        state::Mint,
+    },
+    spl_token_group_interface::{
+        error::TokenGroupError,
+        instruction::{
+            InitializeGroup, TokenGroupInstruction, UpdateGroupAuthority, UpdateGroupMaxSize,
+        },
+        state::{TokenGroup, TokenGroupMember},
+    },
+    spl_token_metadata_interface::state::TokenMetadata,
+    spl_type_length_value::state::TlvStateMut,
+};
+
+fn check_update_authority(
+    update_authority_info: &AccountInfo,
+    expected_update_authority: &OptionalNonZeroPubkey,
+) -> ProgramResult {
+    if !update_authority_info.is_signer {
+        return Err(ProgramError::MissingRequiredSignature);
+    }
+    let update_authority = Option::<Pubkey>::from(*expected_update_authority)
+        .ok_or(TokenGroupError::ImmutableGroup)?;
+    if update_authority != *update_authority_info.key {
+        return Err(TokenGroupError::IncorrectUpdateAuthority.into());
+    }
+    Ok(())
+}
+
+/// Checks that a mint is valid and contains metadata.
+fn check_mint_and_metadata(
+    mint_info: &AccountInfo,
+    mint_authority_info: &AccountInfo,
+) -> ProgramResult {
+    let mint_data = mint_info.try_borrow_data()?;
+    let mint = StateWithExtensions::<Mint>::unpack(&mint_data)?;
+
+    if !mint_authority_info.is_signer {
+        return Err(ProgramError::MissingRequiredSignature);
+    }
+    if mint.base.mint_authority.as_ref() != COption::Some(mint_authority_info.key) {
+        return Err(TokenGroupError::IncorrectMintAuthority.into());
+    }
+
+    let metadata_pointer = mint.get_extension::<MetadataPointer>()?;
+    let metadata_pointer_address = Option::<Pubkey>::from(metadata_pointer.metadata_address);
+    if metadata_pointer_address != Some(*mint_info.key) {
+        return Err(ProgramError::InvalidAccountData);
+    }
+
+    mint.get_variable_len_extension::<TokenMetadata>()?; // Ensure it contains valid TokenMetadata
+
+    Ok(())
+}
+
+/// Processes an [InitializeGroup](enum.GroupInterfaceInstruction.html)
+/// instruction to initialize a collection.
+pub fn process_initialize_collection(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    data: InitializeGroup,
+) -> ProgramResult {
+    let account_info_iter = &mut accounts.iter();
+
+    let collection_info = next_account_info(account_info_iter)?;
+    let mint_info = next_account_info(account_info_iter)?;
+    let mint_authority_info = next_account_info(account_info_iter)?;
+
+    check_mint_and_metadata(mint_info, mint_authority_info)?;
+
+    // Initialize the collection
+    let mut buffer = collection_info.try_borrow_mut_data()?;
+    let mut state = TlvStateMut::unpack(&mut buffer)?;
+    let (collection, _) = state.init_value::<TokenGroup>(false)?;
+    *collection = TokenGroup::new(mint_info.key, data.update_authority, data.max_size.into());
+
+    Ok(())
+}
+
+/// Processes an
+/// [UpdateGroupMaxSize](enum.GroupInterfaceInstruction.html)
+/// instruction to update the max size of a collection.
+pub fn process_update_collection_max_size(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    data: UpdateGroupMaxSize,
+) -> ProgramResult {
+    let account_info_iter = &mut accounts.iter();
+
+    let collection_info = next_account_info(account_info_iter)?;
+    let update_authority_info = next_account_info(account_info_iter)?;
+
+    let mut buffer = collection_info.try_borrow_mut_data()?;
+    let mut state = TlvStateMut::unpack(&mut buffer)?;
+    let collection = state.get_first_value_mut::<TokenGroup>()?;
+
+    check_update_authority(update_authority_info, &collection.update_authority)?;
+
+    collection.update_max_size(data.max_size.into())?;
+
+    Ok(())
+}
+
+/// Processes an
+/// [UpdateGroupAuthority](enum.GroupInterfaceInstruction.html)
+/// instruction to update the authority of a collection.
+pub fn process_update_collection_authority(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    data: UpdateGroupAuthority,
+) -> ProgramResult {
+    let account_info_iter = &mut accounts.iter();
+
+    let collection_info = next_account_info(account_info_iter)?;
+    let update_authority_info = next_account_info(account_info_iter)?;
+
+    let mut buffer = collection_info.try_borrow_mut_data()?;
+    let mut state = TlvStateMut::unpack(&mut buffer)?;
+    let collection = state.get_first_value_mut::<TokenGroup>()?;
+
+    check_update_authority(update_authority_info, &collection.update_authority)?;
+
+    collection.update_authority = data.new_authority;
+
+    Ok(())
+}
+
+/// Processes an [InitializeMember](enum.GroupInterfaceInstruction.html)
+/// instruction
+pub fn process_initialize_collection_member(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+) -> ProgramResult {
+    let account_info_iter = &mut accounts.iter();
+
+    let member_info = next_account_info(account_info_iter)?;
+    let mint_info = next_account_info(account_info_iter)?;
+    let mint_authority_info = next_account_info(account_info_iter)?;
+    let collection_info = next_account_info(account_info_iter)?;
+    let collection_update_authority_info = next_account_info(account_info_iter)?;
+
+    check_mint_and_metadata(mint_info, mint_authority_info)?;
+
+    let mut buffer = collection_info.try_borrow_mut_data()?;
+    let mut state = TlvStateMut::unpack(&mut buffer)?;
+    let collection = state.get_first_value_mut::<TokenGroup>()?;
+
+    check_update_authority(
+        collection_update_authority_info,
+        &collection.update_authority,
+    )?;
+    let member_number = collection.increment_size()?;
+
+    let mut buffer = member_info.try_borrow_mut_data()?;
+    let mut state = TlvStateMut::unpack(&mut buffer)?;
+
+    // This program uses `allow_repetition: true` because the same mint can be
+    // a member of multiple collections.
+    let (member, _) = state.init_value::<TokenGroupMember>(/* allow_repetition */ true)?;
+    *member = TokenGroupMember::new(mint_info.key, collection_info.key, member_number);
+
+    Ok(())
+}
+
+/// Processes an `SplTokenGroupInstruction`
+pub fn process(program_id: &Pubkey, accounts: &[AccountInfo], input: &[u8]) -> ProgramResult {
+    let instruction = TokenGroupInstruction::unpack(input)?;
+    match instruction {
+        TokenGroupInstruction::InitializeGroup(data) => {
+            msg!("Instruction: InitializeCollection");
+            process_initialize_collection(program_id, accounts, data)
+        }
+        TokenGroupInstruction::UpdateGroupMaxSize(data) => {
+            msg!("Instruction: UpdateCollectionMaxSize");
+            process_update_collection_max_size(program_id, accounts, data)
+        }
+        TokenGroupInstruction::UpdateGroupAuthority(data) => {
+            msg!("Instruction: UpdateCollectionAuthority");
+            process_update_collection_authority(program_id, accounts, data)
+        }
+        TokenGroupInstruction::InitializeMember(_) => {
+            msg!("Instruction: InitializeCollectionMember");
+            process_initialize_collection_member(program_id, accounts)
+        }
+    }
+}