feat(etherscan): additional chain apis (#1343)

* xdai

* sokol

* poa & rsk

* oasis chains

* fix test

* test

ethers-core/src/types/chain.rs

@@ -44,6 +44,12 @@ pub enum Chain {
     BinanceSmartChain = 56,
     #[strum(serialize = "bsc-testnet")]
     BinanceSmartChainTestnet = 97,
+    Poa = 99,
+    Sokol = 77,
+    Rsk = 30,
+    Oasis = 26863,
+    Emerald = 42262,
+    EmeraldTestnet = 42261,
 }
 
 impl fmt::Display for Chain {
@@ -74,6 +80,12 @@ impl fmt::Display for Chain {
             Chain::ArbitrumTestnet => "arbitrum-testnet",
             Chain::Cronos => "cronos",
             Chain::CronosTestnet => "cronos-testnet",
+            Chain::Poa => "poa",
+            Chain::Sokol => "sokol",
+            Chain::Rsk => "rsk",
+            Chain::Oasis => "oasis",
+            Chain::Emerald => "emerald",
+            Chain::EmeraldTestnet => "emerald-testnet",
         };
 
         write!(formatter, "{}", chain)
@@ -128,6 +140,12 @@ impl TryFrom<u64> for Chain {
             421611 => Chain::ArbitrumTestnet,
             25 => Chain::Cronos,
             338 => Chain::CronosTestnet,
+            99 => Chain::Poa,
+            77 => Chain::Sokol,
+            30 => Chain::Rsk,
+            26863 => Chain::Oasis,
+            42262 => Chain::Emerald,
+            42261 => Chain::EmeraldTestnet,
             _ => return Err(ParseChainError(chain.to_string())),
         })
     }
@@ -173,6 +191,12 @@ impl FromStr for Chain {
             "arbitrum-testnet" => Chain::ArbitrumTestnet,
             "cronos" => Chain::Cronos,
             "cronos-testnet" => Chain::CronosTestnet,
+            "poa" => Chain::Poa,
+            "sokol" => Chain::Sokol,
+            "rsk" => Chain::Rsk,
+            "oasis" => Chain::Oasis,
+            "emerald" => Chain::Emerald,
+            "emerald-testnet" => Chain::EmeraldTestnet,
             _ => return Err(ParseChainError(chain.to_owned())),
         })
     }
@@ -192,7 +216,11 @@ impl Chain {
                 Chain::BinanceSmartChain |
                 Chain::BinanceSmartChainTestnet |
                 Chain::Arbitrum |
-                Chain::ArbitrumTestnet,
+                Chain::ArbitrumTestnet |
+                Chain::Rsk |
+                Chain::Oasis |
+                Chain::Emerald |
+                Chain::EmeraldTestnet,
         )
     }
 }

ethers-etherscan/src/lib.rs

@@ -97,8 +97,14 @@ impl Client {
             Chain::Fantom | Chain::FantomTestnet => {
                 std::env::var("FTMSCAN_API_KEY").or_else(|_| std::env::var("FANTOMSCAN_API_KEY"))?
             }
-
+            Chain::XDai |
-            Chain::XDai | Chain::Sepolia => String::default(),
+            Chain::Sepolia |
+            Chain::Rsk |
+            Chain::Sokol |
+            Chain::Poa |
+            Chain::Oasis |
+            Chain::Emerald |
+            Chain::EmeraldTestnet => String::default(),
             Chain::Moonbeam | Chain::MoonbeamDev | Chain::Moonriver => {
                 std::env::var("MOONSCAN_API_KEY")?
             }
@@ -268,6 +274,29 @@ impl ClientBuilder {
             Chain::Moonriver => {
                 urls("https://api-moonriver.moonscan.io/api", "https://moonriver.moonscan.io")
             }
+            // blockscout API is etherscan compatible
+            Chain::XDai => urls(
+                "https://blockscout.com/xdai/mainnet/api",
+                "https://blockscout.com/xdai/mainnet",
+            ),
+            Chain::Sokol => {
+                urls("https://blockscout.com/poa/sokol/api", "https://blockscout.com/poa/sokol")
+            }
+            Chain::Poa => {
+                urls("https://blockscout.com/poa/core/api", "https://blockscout.com/poa/core")
+            }
+            Chain::Rsk => {
+                urls("https://blockscout.com/rsk/mainnet/api", "https://blockscout.com/rsk/mainnet")
+            }
+            Chain::Oasis => urls("https://scan.oasischain.io/api", "https://scan.oasischain.io/"),
+            Chain::Emerald => urls(
+                "https://explorer.emerald.oasis.dev/api",
+                "https://explorer.emerald.oasis.dev/",
+            ),
+            Chain::EmeraldTestnet => urls(
+                "https://testnet.explorer.emerald.oasis.dev/api",
+                "https://testnet.explorer.emerald.oasis.dev/",
+            ),
             Chain::Dev => return Err(EtherscanError::LocalNetworksNotSupported),
             chain => return Err(EtherscanError::ChainNotSupported(chain)),
         };
@@ -447,10 +476,10 @@ mod tests {
 
     #[test]
     fn chain_not_supported() {
-        let err = Client::new_from_env(Chain::XDai).unwrap_err();
+        let err = Client::new_from_env(Chain::Sepolia).unwrap_err();
 
         assert!(matches!(err, EtherscanError::ChainNotSupported(_)));
-        assert_eq!(err.to_string(), "Chain xdai not supported");
+        assert_eq!(err.to_string(), "Chain sepolia not supported");
     }
 
     #[test]