program: add update_authority instruction and test

programs/protocol-contracts-solana/src/lib.rs

@@ -70,6 +70,16 @@ pub mod gateway {
         Ok(())
     }
 
+    pub fn update_authority(ctx: Context<UpdateAuthority>, new_authority_address: Pubkey) -> Result<()> {
+        let pda = &mut ctx.accounts.pda;
+        require!(
+            ctx.accounts.signer.key() == pda.authority,
+            Errors::SignerIsNotAuthority
+        );
+        pda.authority = new_authority_address;
+        Ok(())
+    }
+
     pub fn deposit(ctx: Context<Deposit>, amount: u64, memo: Vec<u8>) -> Result<()> {
         require!(memo.len() >= 20, Errors::MemoLengthTooShort);
         require!(memo.len() <= 512, Errors::MemoLengthExceeded);
@@ -314,6 +324,14 @@ pub struct UpdateTss<'info> {
     pub signer: Signer<'info>,
 }
 
+#[derive(Accounts)]
+pub struct UpdateAuthority<'info> {
+    #[account(mut)]
+    pub pda: Account<'info, Pda>,
+    #[account(mut)]
+    pub signer: Signer<'info>,
+}
+
 #[derive(Accounts)]
 pub struct UpdatePaused<'info> {
     #[account(mut)]

tests/protocol-contracts-solana.ts

@@ -319,6 +319,26 @@ describe("some tests", () => {
 
     });
 
+    it("update authority", async () => {
+        const newAuthority = anchor.web3.Keypair.generate();
+        await gatewayProgram.methods.updateAuthority(newAuthority.publicKey).accounts({
+            pda: pdaAccount,
+        }).rpc();
+        // const pdaAccountData = await gatewayProgram.account.pda.fetch(pdaAccount);
+        // expect(pdaAccountData.authority).to.be.eq(newAuthority.publicKey);
+
+        // now the old authority cannot update TSS address and will fail
+        try {
+            await gatewayProgram.methods.updateTss(Array.from(new Uint8Array(20))).accounts({
+                pda: pdaAccount,
+            }).rpc();
+        } catch (err) {
+            console.log("Error message: ", err.message);
+            expect(err).to.be.instanceof(anchor.AnchorError);
+            expect(err.message).to.include("SignerIsNotAuthority");
+        }
+    });
+
 
 });