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spl_token_2022_interface/extension/
permanent_delegate.rs

1use {
2    crate::extension::{BaseState, BaseStateWithExtensions, Extension, ExtensionType},
3    bytemuck::{Pod, Zeroable},
4    solana_address::Address,
5    solana_nullable::MaybeNull,
6};
7#[cfg(feature = "serde")]
8use {
9    serde::{Deserialize, Serialize},
10    serde_with::{As, DisplayFromStr},
11};
12
13/// Permanent delegate extension data for mints.
14#[repr(C)]
15#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
16#[cfg_attr(feature = "serde", serde(rename_all = "camelCase"))]
17#[derive(Clone, Copy, Debug, Default, PartialEq, Pod, Zeroable)]
18pub struct PermanentDelegate {
19    /// Optional permanent delegate for transferring or burning tokens
20    #[cfg_attr(feature = "serde", serde(with = "As::<Option<DisplayFromStr>>"))]
21    pub delegate: MaybeNull<Address>,
22}
23impl Extension for PermanentDelegate {
24    const TYPE: ExtensionType = ExtensionType::PermanentDelegate;
25}
26
27/// Attempts to get the permanent delegate from the TLV data, returning None
28/// if the extension is not found
29pub fn get_permanent_delegate<S: BaseState, BSE: BaseStateWithExtensions<S>>(
30    state: &BSE,
31) -> Option<Address> {
32    state
33        .get_extension::<PermanentDelegate>()
34        .ok()
35        .and_then(|e| Option::<Address>::from(e.delegate))
36}