feat: add the sign feature

Cargo.toml

@@ -16,6 +16,7 @@ eth-keystore = { version = "0.4" }
 fuel-crypto = "0.6"
 fuel-types = "0.5"
 fuels = { version = "0.20", default-features = false }
+fuels-signers = { version = "0.20.0" }
 home = "0.5.3"
 rand = { version = "0.8.4", default-features = false }
 rpassword = "6.0.1"

src/account.rs

@@ -2,8 +2,7 @@ use crate::utils::{
     create_accounts_file, number_of_derived_accounts, Accounts, DEFAULT_WALLETS_VAULT_PATH,
 };
 use anyhow::{bail, Result};
-use fuels::prelude::*;
-use fuels::signers::wallet::Wallet;
+use fuels::{prelude::*, signers::wallet::Wallet};
 use std::path::PathBuf;
 
 pub(crate) fn print_account_address(path: Option<String>, account_index: usize) -> Result<()> {
@@ -13,7 +12,7 @@ pub(crate) fn print_account_address(path: Option<String>, account_index: usize)
     };
     let existing_accounts = Accounts::from_dir(&wallet_path)?;
     if let Some(account) = existing_accounts.addresses().iter().nth(account_index) {
-        println!("Account {} address: 0x{}", account_index, account);
+        println!("Account {} address: {}", account_index, account);
     } else {
         eprintln!("Account {} is not derived yet!", account_index);
     }
@@ -43,6 +42,6 @@ pub(crate) fn new_account(path: Option<String>) -> Result<()> {
     account_addresses.push(wallet.address().to_string());
     create_accounts_file(&wallet_path, account_addresses)?;
 
-    println!("Wallet public address: {}", wallet.address());
+    println!("Wallet address: {}", wallet.address());
     Ok(())
 }

src/main.rs

@@ -1,12 +1,14 @@
 mod account;
 mod init;
 mod list;
+mod sign;
 mod utils;
 
 use crate::{
     account::{new_account, print_account_address},
     init::init_wallet,
     list::print_wallet_list,
+    sign::sign_transaction_manually,
 };
 use anyhow::Result;
 use clap::{ArgEnum, Parser, Subcommand};
@@ -39,6 +41,12 @@ enum Command {
         account_index: usize,
         path: Option<String>,
     },
+    /// Sign a transaction by providing its ID and the signing account's index
+    Sign {
+        id: String,
+        account_index: usize,
+        path: Option<String>,
+    },
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, ArgEnum)]
@@ -60,6 +68,11 @@ async fn main() -> Result<()> {
             account_index,
             path,
         } => print_account_address(path, account_index)?,
+        Command::Sign {
+            id,
+            account_index,
+            path,
+        } => sign_transaction_manually(&id, account_index, path).await?,
     };
     Ok(())
 }

src/sign.rs

@@ -0,0 +1,23 @@
+use crate::utils::{derive_account_with_index, DEFAULT_WALLETS_VAULT_PATH};
+use anyhow::{anyhow, Result};
+use fuel_crypto::{Message, Signature};
+use fuel_types::Bytes32;
+use fuels::prelude::*;
+use std::{path::PathBuf, str::FromStr};
+
+pub(crate) async fn sign_transaction_manually(
+    id: &str,
+    account_index: usize,
+    path: Option<String>,
+) -> Result<(), Error> {
+    let wallet_path = match &path {
+        Some(path) => PathBuf::from(path),
+        None => home::home_dir().unwrap().join(DEFAULT_WALLETS_VAULT_PATH),
+    };
+    let tx_id = Bytes32::from_str(id).map_err(|e| anyhow!("{}", e))?;
+    let secret_key = derive_account_with_index(&wallet_path, account_index)?;
+    let message_hash = unsafe { Message::from_bytes_unchecked(*tx_id) };
+    let sig = Signature::sign(&secret_key, &message_hash);
+    println!("Signature: {sig}");
+    Ok(())
+}

src/utils.rs

@@ -1,4 +1,5 @@
 use anyhow::{anyhow, Result};
+use fuel_crypto::SecretKey;
 use serde::{Deserialize, Serialize};
 use std::{fs, path::Path};
 
@@ -62,3 +63,14 @@ pub(crate) fn number_of_derived_accounts(path: &Path) -> usize {
         0
     }
 }
+
+pub(crate) fn derive_account_with_index(path: &Path, account_index: usize) -> Result<SecretKey> {
+    let password = rpassword::prompt_password(
+        "Please enter your password to decrypt initialized wallet's phrases: ",
+    )?;
+    let phrase_recovered = eth_keystore::decrypt_key(path.join(".wallet"), password)?;
+    let phrase = String::from_utf8(phrase_recovered)?;
+    let derive_path = format!("m/44'/1179993420'/{}'/0/0", account_index);
+    let secret_key = SecretKey::new_from_mnemonic_phrase_with_path(&phrase, &derive_path)?;
+    Ok(secret_key)
+}