spl: adding metadata account type

CHANGELOG.md

@@ -19,6 +19,7 @@ The minor version will be incremented upon a breaking change and the patch versi
 
 ### Features
 
+* spl: Add `MetadataAccount` account deserialization. ([#2014](https://github.com/coral-xyz/anchor/pull/2014)).
 * lang: Add `realloc`, `realloc::payer`, and `realloc::zero` as a new constraint group for program accounts ([#1986](https://github.com/coral-xyz/anchor/pull/1986)).
 * lang: Add `PartialEq` and `Eq` for `anchor_lang::Error` ([#1544](https://github.com/coral-xyz/anchor/pull/1544)).
 * cli: Add `--skip-build` to `anchor publish` ([#1786](https://github.com/coral-xyz/anchor/pull/1841)).

spl/src/metadata.rs

@@ -266,3 +266,32 @@ pub struct SetCollectionSize<'info> {
     pub update_authority: AccountInfo<'info>,
     pub system_program: AccountInfo<'info>,
 }
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct MetadataAccount(mpl_token_metadata::state::Metadata);
+
+impl MetadataAccount {
+    pub const LEN: usize = mpl_token_metadata::state::MAX_METADATA_LEN;
+}
+
+impl anchor_lang::AccountDeserialize for MetadataAccount {
+    fn try_deserialize_unchecked(buf: &mut &[u8]) -> anchor_lang::Result<Self> {
+        let result = mpl_token_metadata::state::Metadata::safe_deserialize(buf)?;
+        Ok(MetadataAccount(result))
+    }
+}
+
+impl anchor_lang::AccountSerialize for MetadataAccount {}
+
+impl anchor_lang::Owner for MetadataAccount {
+    fn owner() -> Pubkey {
+        ID
+    }
+}
+
+impl Deref for MetadataAccount {
+    type Target = mpl_token_metadata::state::Metadata;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}