fix/etherscan verification

ethers-etherscan/Cargo.toml

@@ -15,6 +15,7 @@ keywords = ["ethereum", "web3", "etherscan", "ethers"]
 
 [dependencies]
 ethers-core = { version = "^0.6.0", path = "../ethers-core", default-features = false }
+ethers-solc = { version = "^0.1.0", path = "../ethers-solc", default-features = false }
 reqwest = { version = "0.11.9", default-features = false, features = ["json"] }
 serde = { version = "1.0.124", default-features = false, features = ["derive"] }
 serde_json = { version = "1.0.64", default-features = false }

ethers-etherscan/resources/IERC20.sol

@@ -0,0 +1,15 @@
+interface IERC20 {
+    function totalSupply() external view returns(uint);
+
+    function balanceOf(address account) external view returns(uint);
+
+    function transfer(address recipient, uint amount) external returns(bool);
+
+    function allowance(address owner, address spender) external view returns(uint);
+
+    function approve(address spender, uint amount) external returns(bool);
+
+    function transferFrom(address sender, address recipient, uint amount) external returns(bool);
+    event Transfer(address indexed from, address indexed to, uint value);
+    event Approval(address indexed owner, address indexed spender, uint value);
+}

ethers-etherscan/resources/UniswapExchange.sol

@@ -1,23 +1,10 @@
 /**
- *Submitted for verification at Etherscan.io on 2021-10-03
-*/
+ * Submitted for verification at Etherscan.io on 2021-10-03
+ */
 
 pragma solidity ^0.5.17;
-interface IERC20 {
-    function totalSupply() external view returns(uint);
 
-    function balanceOf(address account) external view returns(uint);
-
-    function transfer(address recipient, uint amount) external returns(bool);
-
-    function allowance(address owner, address spender) external view returns(uint);
-
-    function approve(address spender, uint amount) external returns(bool);
-
-    function transferFrom(address sender, address recipient, uint amount) external returns(bool);
-    event Transfer(address indexed from, address indexed to, uint value);
-    event Approval(address indexed owner, address indexed spender, uint value);
-}
+import "./IERC20.sol";
 
 library Address {
     function isContract(address account) internal view returns(bool) {

ethers-etherscan/src/contract.rs

@@ -262,11 +262,12 @@ impl Client {
 
 #[cfg(test)]
 mod tests {
-    use std::time::Duration;
+    use std::{path::PathBuf, time::Duration};
 
     use serial_test::serial;
 
     use ethers_core::types::Chain;
+    use ethers_solc::{MinimalCombinedArtifacts, Project, ProjectPathsConfig};
 
     use crate::{contract::VerifyContract, tests::run_at_least_duration, Client};
 
@@ -302,26 +303,32 @@ mod tests {
 
     #[tokio::test]
     #[serial]
-    #[ignore]
-    async fn can_verify_contract() {
+    async fn can_flatten_and_verify_contract() {
         run_at_least_duration(Duration::from_millis(250), async {
-            // TODO this needs further investigation
+            let root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("resources");
+            let paths = ProjectPathsConfig::builder()
+                .sources(&root)
+                .build()
+                .expect("failed to resolve project paths");
+            let project = Project::<MinimalCombinedArtifacts>::builder()
+                .paths(paths)
+                .build()
+                .expect("failed to build the project");
 
-            // https://etherscan.io/address/0x9e744c9115b74834c0f33f4097f40c02a9ac5c33#code
-            let contract = include_str!("../resources/UniswapExchange.sol");
             let address = "0x9e744c9115b74834c0f33f4097f40c02a9ac5c33".parse().unwrap();
             let compiler_version = "v0.5.17+commit.d19bba13";
             let constructor_args = "0x000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000005f5e1000000000000000000000000000000000000000000000000000000000000000007596179537761700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035941590000000000000000000000000000000000000000000000000000000000";
+            let contract = project.flatten(&root.join("UniswapExchange.sol")).expect("failed to flatten contract");
 
             let client = Client::new_from_env(Chain::Mainnet).unwrap();
 
             let contract =
-                VerifyContract::new(address, contract.to_string(), compiler_version.to_string())
+                VerifyContract::new(address, contract, compiler_version.to_string())
                     .constructor_arguments(Some(constructor_args))
                     .optimization(true)
                     .runs(200);
-
             let _resp = client.submit_contract_verification(&contract).await;
-        }).await
+        })
+        .await
     }
 }