finish burn functionality

Author: samuelvanderwaal

README.md

@@ -45,6 +45,8 @@ cargo install metaboss
 
 ### Install From Source
 
+Requires Rust 1.56 or later.
+
 Install [Rust](https://www.rust-lang.org/tools/install).
 
 ```bash

src/burn.rs

@@ -1,5 +1,9 @@
 use anyhow::Result;
-use metaplex_token_metadata::{id, instruction::update_metadata_accounts, state::Data};
+use metaplex_token_metadata::{
+    id,
+    instruction::update_metadata_accounts,
+    state::{Data, Metadata},
+};
 use retry::{delay::Exponential, retry};
 use solana_client::rpc_client::RpcClient;
 use solana_sdk::{
@@ -12,22 +16,18 @@ use spl_associated_token_account::get_associated_token_address;
 use spl_token;
 use std::str::FromStr;
 
+use crate::decode::decode;
 use crate::derive::derive_metadata_pda;
 use crate::parse::parse_keypair;
 
-pub fn burn_one(
-    client: &RpcClient,
-    keypair: String,
-    owner_wallet: String,
-    mint_address: String,
-) -> Result<()> {
+pub fn burn_one(client: &RpcClient, keypair: String, mint_address: String) -> Result<()> {
     let mint_pubkey = Pubkey::from_str(&mint_address)?;
     let keypair = parse_keypair(&keypair)?;
-    let owner_pubkey = Pubkey::from_str(&owner_wallet)?;
+    let owner_pubkey = keypair.pubkey();
 
     let sig = burn(client, &keypair, &owner_pubkey, &mint_pubkey, 1)?;
 
-    println!("{}", sig);
+    println!("TxId: {}", sig);
 
     Ok(())
 }
@@ -59,24 +59,25 @@ pub fn burn(
         &[&signer.pubkey()],
     )?;
 
-    let metadata_pubkey = derive_metadata_pda(mint_pubkey);
+    let mut instructions = vec![burn_ix, close_associated_token_account];
 
-    let data = default_data();
+    let metadata: Metadata = decode(client, &mint_pubkey.to_string())?;
 
-    let clear_metadata_account = update_metadata_accounts(
-        id(),
-        metadata_pubkey,
-        signer.pubkey(),
-        None,
-        Some(data),
-        None,
-    );
+    if signer.pubkey() == metadata.update_authority {
+        let metadata_pubkey = derive_metadata_pda(mint_pubkey);
 
-    let instructions = vec![
-        burn_ix,
-        close_associated_token_account,
-        clear_metadata_account,
-    ];
+        let data = default_data();
+
+        let clear_metadata_account = update_metadata_accounts(
+            id(),
+            metadata_pubkey,
+            signer.pubkey(),
+            None,
+            Some(data),
+            None,
+        );
+        instructions.push(clear_metadata_account);
+    }
 
     let (recent_blockhash, _) = client.get_recent_blockhash()?;
     let tx = Transaction::new_signed_with_payer(

src/opt.rs

@@ -78,10 +78,6 @@ pub enum BurnSubcommands {
         #[structopt(short, long)]
         keypair: String,
 
-        /// Owner wallet address
-        #[structopt(short, long)]
-        owner_wallet: String,
-
         /// Token mint account
         #[structopt(short, long)]
         account: String,

src/process_subcommands.rs

@@ -12,11 +12,7 @@ use crate::update_metadata::*;
 
 pub fn process_burn(client: &RpcClient, commands: BurnSubcommands) -> Result<()> {
     match commands {
-        BurnSubcommands::One {
-            keypair,
-            owner_wallet,
-            account,
-        } => burn_one(client, keypair, owner_wallet, account),
+        BurnSubcommands::One { keypair, account } => burn_one(client, keypair, account),
     }
 }