solana: Add accept_token_authority ix and TS helper function

Author: nvsriram

solana/programs/example-native-token-transfers/src/instructions/admin.rs

@@ -158,6 +158,43 @@ pub fn claim_ownership(ctx: Context<ClaimOwnership>) -> Result<()> {
 
 // * Set token authority
 
+#[derive(Accounts)]
+pub struct AcceptTokenAuthority<'info> {
+    #[account(
+        has_one = mint,
+        constraint = config.paused @ NTTError::NotPaused,
+    )]
+    pub config: Account<'info, Config>,
+
+    #[account(mut)]
+    pub mint: InterfaceAccount<'info, token_interface::Mint>,
+
+    #[account(
+        seeds = [crate::TOKEN_AUTHORITY_SEED],
+        bump,
+    )]
+    /// CHECK: The constraints enforce this is valid mint authority
+    pub token_authority: UncheckedAccount<'info>,
+
+    pub current_authority: Signer<'info>,
+
+    pub token_program: Interface<'info, token_interface::TokenInterface>,
+}
+
+pub fn accept_token_authority(ctx: Context<AcceptTokenAuthority>) -> Result<()> {
+    token_interface::set_authority(
+        CpiContext::new(
+            ctx.accounts.token_program.to_account_info(),
+            token_interface::SetAuthority {
+                account_or_mint: ctx.accounts.mint.to_account_info(),
+                current_authority: ctx.accounts.current_authority.to_account_info(),
+            },
+        ),
+        AuthorityType::MintTokens,
+        Some(ctx.accounts.token_authority.key()),
+    )
+}
+
 #[derive(Accounts)]
 pub struct SetTokenAuthority<'info> {
     #[account(
@@ -170,7 +207,6 @@ pub struct SetTokenAuthority<'info> {
     pub owner: Signer<'info>,
 
     #[account(mut)]
-    /// CHECK: the mint address matches the config
     pub mint: InterfaceAccount<'info, token_interface::Mint>,
 
     #[account(
@@ -244,6 +280,8 @@ pub fn set_token_authority_one_step_unchecked(
     )
 }
 
+// * Claim token authority
+
 #[derive(Accounts)]
 pub struct RevertTokenAuthority<'info> {
     #[account(
@@ -253,7 +291,6 @@ pub struct RevertTokenAuthority<'info> {
     pub config: Account<'info, Config>,
 
     #[account(mut)]
-    /// CHECK: the mint address matches the config
     pub mint: InterfaceAccount<'info, token_interface::Mint>,
 
     #[account(
@@ -264,7 +301,7 @@ pub struct RevertTokenAuthority<'info> {
     pub token_authority: UncheckedAccount<'info>,
 
     #[account(mut)]
-    /// CHECK: the constraint enforces that this is the correct address
+    /// CHECK: the `pending_token_authority` constraint enforces that this is the correct address
     pub rent_payer: UncheckedAccount<'info>,
 
     #[account(

solana/programs/example-native-token-transfers/src/lib.rs

@@ -127,6 +127,10 @@ pub mod example_native_token_transfers {
         instructions::claim_ownership(ctx)
     }
 
+    pub fn accept_token_authority(ctx: Context<AcceptTokenAuthority>) -> Result<()> {
+        instructions::accept_token_authority(ctx)
+    }
+
     pub fn set_token_authority(ctx: Context<SetTokenAuthorityChecked>) -> Result<()> {
         instructions::set_token_authority(ctx)
     }

solana/ts/idl/3_0_0/json/example_native_token_transfers.json

@@ -719,6 +719,37 @@
       ],
       "args": []
     },
+    {
+      "name": "acceptTokenAuthority",
+      "accounts": [
+        {
+          "name": "config",
+          "isMut": false,
+          "isSigner": false
+        },
+        {
+          "name": "mint",
+          "isMut": true,
+          "isSigner": false
+        },
+        {
+          "name": "tokenAuthority",
+          "isMut": false,
+          "isSigner": false
+        },
+        {
+          "name": "currentAuthority",
+          "isMut": false,
+          "isSigner": true
+        },
+        {
+          "name": "tokenProgram",
+          "isMut": false,
+          "isSigner": false
+        }
+      ],
+      "args": []
+    },
     {
       "name": "setTokenAuthority",
       "accounts": [

solana/ts/idl/3_0_0/ts/example_native_token_transfers.ts

@@ -719,6 +719,37 @@ export type ExampleNativeTokenTransfers = {
       ],
       "args": []
     },
+    {
+      "name": "acceptTokenAuthority",
+      "accounts": [
+        {
+          "name": "config",
+          "isMut": false,
+          "isSigner": false
+        },
+        {
+          "name": "mint",
+          "isMut": true,
+          "isSigner": false
+        },
+        {
+          "name": "tokenAuthority",
+          "isMut": false,
+          "isSigner": false
+        },
+        {
+          "name": "currentAuthority",
+          "isMut": false,
+          "isSigner": true
+        },
+        {
+          "name": "tokenProgram",
+          "isMut": false,
+          "isSigner": false
+        }
+      ],
+      "args": []
+    },
     {
       "name": "setTokenAuthority",
       "accounts": [
@@ -2962,6 +2993,37 @@ export const IDL: ExampleNativeTokenTransfers = {
       ],
       "args": []
     },
+    {
+      "name": "acceptTokenAuthority",
+      "accounts": [
+        {
+          "name": "config",
+          "isMut": false,
+          "isSigner": false
+        },
+        {
+          "name": "mint",
+          "isMut": true,
+          "isSigner": false
+        },
+        {
+          "name": "tokenAuthority",
+          "isMut": false,
+          "isSigner": false
+        },
+        {
+          "name": "currentAuthority",
+          "isMut": false,
+          "isSigner": true
+        },
+        {
+          "name": "tokenProgram",
+          "isMut": false,
+          "isSigner": false
+        }
+      ],
+      "args": []
+    },
     {
       "name": "setTokenAuthority",
       "accounts": [

solana/ts/lib/ntt.ts

@@ -713,6 +713,27 @@ export namespace NTT {
       .instruction();
   }
 
+  export async function createAcceptTokenAuthorityInstruction(
+    program: Program<NttBindings.NativeTokenTransfer<IdlVersion>>,
+    config: NttBindings.Config<IdlVersion>,
+    args: {
+      currentAuthority: PublicKey;
+    },
+    pdas?: Pdas
+  ) {
+    pdas = pdas ?? NTT.pdas(program.programId);
+    return await program.methods
+      .acceptTokenAuthority()
+      .accountsStrict({
+        config: pdas.configAccount(),
+        mint: config.mint,
+        tokenProgram: config.tokenProgram,
+        tokenAuthority: pdas.tokenAuthority(),
+        currentAuthority: args.currentAuthority,
+      })
+      .instruction();
+  }
+
   export async function createSetTokenAuthorityInstruction(
     program: Program<NttBindings.NativeTokenTransfer<IdlVersion>>,
     config: NttBindings.Config<IdlVersion>,