fix error

core/node/da_clients/src/avail/client.rs

@@ -10,6 +10,7 @@ use zksync_da_client::{
 };
 
 use crate::avail::sdk::RawAvailClient;
+use hex::FromHex;
 
 /// An implementation of the `DataAvailabilityClient` trait that interacts with the Avail network.
 #[derive(Debug, Clone)]
@@ -21,7 +22,16 @@ pub struct AvailClient {
 impl AvailClient {
     pub async fn new(config: AvailConfig, secrets: AvailSecrets) -> anyhow::Result<Self> {
         let sdk_client = if secrets.private_key.is_some() {
-            RawAvailClient::new_with_gcs_seed(config.app_id, &secrets.private_key.unwrap()).await?
+            let pk = secrets.private_key.clone().unwrap();
+
+            let bytes = Vec::from_hex(pk).map_err(|e| anyhow::anyhow!("hex string convert failed: {}", e.to_string()))?;
+            if bytes.len() != 32 {
+                return Err(anyhow::anyhow!("Hex string must represent exactly 32 bytes."));
+            }
+            let mut array = [0u8; 32];
+            array.copy_from_slice(&bytes);
+
+            RawAvailClient::new_with_gcs_seed(config.app_id, array).await?
         } else {
             let seed_phrase = secrets
             .seed_phrase

core/node/da_clients/src/avail/sdk.rs

@@ -11,7 +11,7 @@ use parity_scale_codec::{Compact, Decode, Encode};
 use scale_encode::EncodeAsFields;
 use subxt_signer::{
     bip39::Mnemonic,
-    sr25519::{Keypair, Signature},
+    sr25519::{Keypair, Seed, Signature},
 };
 
 use crate::avail::client::to_non_retriable_da_error;
@@ -47,10 +47,8 @@ impl RawAvailClient {
         Ok(Self { app_id, keypair })
     }
 
-    pub(crate) async fn new_with_gcs_seed(app_id: u32, seed: &str) -> anyhow::Result<Self> {
-        let bytes: [u8; 32] = seed.as_bytes().try_into().map_err(|_| anyhow::anyhow!("String must be exactly 32 bytes"))?;
-        let keypair = Keypair::from_seed(bytes)?;
-
+    pub(crate) async fn new_with_gcs_seed(app_id: u32, seed: Seed) -> anyhow::Result<Self> {
+        let keypair = Keypair::from_seed(seed)?;
         Ok(Self { app_id, keypair })
     }