solana/token-program: derive metadata address in client

Change-Id: Ia5e54725c13cc2725efa88b9848910829de48463

solana/modules/token_bridge/client/src/main.rs

@@ -35,6 +35,7 @@ use solana_client::{
     rpc_client::RpcClient,
     rpc_config::RpcSendTransactionConfig,
 };
+use solana_program::account_info::AccountInfo;
 use solana_sdk::{
     commitment_config::{
         CommitmentConfig,
@@ -218,6 +219,20 @@ fn main() {
                         .help("Specify the token bridge program address"),
                 ),
         )
+        .subcommand(
+            SubCommand::with_name("metadata")
+                .about("Get the derived metadata associated with token mints")
+                .arg(
+                    Arg::with_name("mint")
+                        .long("mint")
+                        .value_name("MINT_KEY")
+                        .validator(is_pubkey_or_keypair)
+                        .takes_value(true)
+                        .index(1)
+                        .required(true)
+                        .help("Specify the token mint to derive metadata for"),
+                ),
+        )
         .subcommand(
             SubCommand::with_name("create-meta")
                 .about("Create token metadata")
@@ -310,6 +325,30 @@ fn main() {
 
             Ok(None)
         }
+        ("metadata", Some(arg_matches)) => {
+            let mint = pubkey_of(arg_matches, "mint").unwrap();
+            let meta_acc = Pubkey::find_program_address(
+                &[
+                    "metadata".as_bytes(),
+                    spl_token_metadata::id().as_ref(),
+                    mint.as_ref(),
+                ],
+                &spl_token_metadata::id(),
+            )
+            .0;
+            let meta_info = config.rpc_client.get_account(&meta_acc).unwrap();
+            let meta_info = spl_token_metadata::state::Metadata::from_bytes(&meta_info.data).unwrap();
+            println!("Key: {:?}", meta_info.key);
+            println!("Mint: {}", meta_info.mint);
+            println!("Metadata Key: {}", meta_acc);
+            println!("Update Authority: {}", meta_info.update_authority);
+            println!("Name: {}", meta_info.data.name);
+            println!("Symbol: {}", meta_info.data.symbol);
+            println!("URI: {}", meta_info.data.uri);
+            println!("Mutable: {}", meta_info.is_mutable);
+
+            Ok(None)
+        }
 
         _ => unreachable!(),
     }

solana/modules/token_bridge/token-metadata/src/state.rs

@@ -107,6 +107,10 @@ pub struct Metadata {
 }
 
 impl Metadata {
+    pub fn from_bytes(a: &[u8]) -> Option<Metadata> {
+        try_from_slice_checked(a, Key::MetadataV1, MAX_METADATA_LEN)
+    }
+
     pub fn from_account_info(a: &AccountInfo) -> Option<Metadata> {
         try_from_slice_checked(&a.data.borrow_mut(), Key::MetadataV1, MAX_METADATA_LEN)
     }