fix: Bring back swapper_pk for backwards compatibility

Took 16 minutes

src/bin/tycho-encode.rs

@@ -1,10 +1,5 @@
-use std::{
-    io::{self, Read},
-    str::FromStr,
-};
+use std::io::{self, Read};
 
-use alloy::signers::local::PrivateKeySigner;
-use alloy_primitives::B256;
 use alloy_sol_types::SolValue;
 use clap::{Parser, Subcommand};
 use tycho_common::{hex_bytes::Bytes, models::Chain};
@@ -58,6 +53,8 @@ pub struct Cli {
     router_address: Option<Bytes>,
     #[arg(short, long)]
     user_transfer_type: Option<UserTransferType>,
+    #[arg(short, long)]
+    swapper_pk: Option<String>,
 }
 
 #[derive(Subcommand)]
@@ -94,6 +91,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             if let Some(user_transfer_type) = cli.user_transfer_type {
                 builder = builder.user_transfer_type(user_transfer_type);
             }
+            #[allow(deprecated)]
+            if let Some(swapper_pk) = cli.swapper_pk {
+                builder = builder.swapper_pk(swapper_pk);
+            }
             builder.build()?
         }
         Commands::TychoExecutor => TychoExecutorEncoderBuilder::new()

src/encoding/evm/approvals/permit2.rs

@@ -175,7 +175,7 @@ impl Permit2 {
             sigDeadline: sig_deadline,
         };
 
-        Ok(models::PermitSingle::try_from(&permit_single)?)
+        models::PermitSingle::try_from(&permit_single)
     }
 }
 

src/encoding/evm/encoder_builders.rs

@@ -1,6 +1,7 @@
-use std::collections::HashMap;
+use std::{collections::HashMap, str::FromStr};
 
 use alloy::signers::local::PrivateKeySigner;
+use alloy_primitives::B256;
 use tycho_common::{models::Chain as TychoCommonChain, Bytes};
 
 use crate::encoding::{
@@ -22,7 +23,7 @@ pub struct TychoRouterEncoderBuilder {
     user_transfer_type: Option<UserTransferType>,
     executors_file_path: Option<String>,
     router_address: Option<Bytes>,
-    signer: Option<PrivateKeySigner>,
+    swapper_pk: Option<String>,
 }
 
 impl Default for TychoRouterEncoderBuilder {
@@ -37,7 +38,7 @@ impl TychoRouterEncoderBuilder {
             chain: None,
             executors_file_path: None,
             router_address: None,
-            signer: None,
+            swapper_pk: None,
             user_transfer_type: None,
         }
     }
@@ -65,11 +66,15 @@ impl TychoRouterEncoderBuilder {
         self
     }
 
-    /// Sets the `signer` for the encoder. This is used to sign permit2 objects. This is only needed
-    /// if you intend to get the full calldata for the transfer. We do not recommend using this
-    /// option, you should sign and create the function calldata entirely on your own.
-    pub fn signer(mut self, signer: PrivateKeySigner) -> Self {
-        self.signer = Some(signer);
+    /// Sets the `swapper_pk` for the encoder. This is used to sign permit2 objects. This is only
+    /// needed if you intend to get the full calldata for the transfer. We do not recommend
+    /// using this option, you should sign and create the function calldata entirely on your
+    /// own.
+    #[deprecated(
+        note = "This is deprecated and will be removed in the future. You should sign and create the function calldata on your own."
+    )]
+    pub fn swapper_pk(mut self, swapper_pk: String) -> Self {
+        self.swapper_pk = Some(swapper_pk);
         self
     }
 
@@ -94,12 +99,23 @@ impl TychoRouterEncoderBuilder {
             let swap_encoder_registry =
                 SwapEncoderRegistry::new(self.executors_file_path.clone(), chain.clone())?;
 
+            let signer = if let Some(pk) = self.swapper_pk {
+                let pk = B256::from_str(&pk).map_err(|_| {
+                    EncodingError::FatalError("Invalid swapper private key provided".to_string())
+                })?;
+                Some(PrivateKeySigner::from_bytes(&pk).map_err(|_| {
+                    EncodingError::FatalError("Failed to create signer".to_string())
+                })?)
+            } else {
+                None
+            };
+
             Ok(Box::new(TychoRouterEncoder::new(
                 chain,
                 swap_encoder_registry,
                 tycho_router_address,
                 user_transfer_type,
-                self.signer,
+                signer,
             )?))
         } else {
             Err(EncodingError::FatalError(

src/encoding/evm/strategy_encoder/strategy_encoders.rs

@@ -551,15 +551,14 @@ mod tests {
 
     fn get_permit(router_address: Bytes, solution: &Solution) -> PermitSingle {
         let permit2 = Permit2::new().unwrap();
-        let permit_single = permit2
+        permit2
             .get_permit(
                 &router_address,
                 &solution.sender,
                 &solution.given_token,
                 &solution.given_amount,
             )
-            .unwrap();
-        permit_single
+            .unwrap()
     }
 
     fn get_signer() -> PrivateKeySigner {