fix: ethers_providers::is_local_endpoint with rust matching pattern o…

…n URL::parse (#2351)

* handling localhost, ipv4 and localhost ips

* adjusted naming

* havenofearlucishere

* enabling also loopback and private addresses

* supporting also ipv6

* removed line

ethers-providers/src/rpc/provider.rs

@@ -13,6 +13,7 @@ use crate::{
 
 #[cfg(not(target_arch = "wasm32"))]
 use crate::{HttpRateLimitRetryPolicy, RetryClient};
+use std::net::Ipv4Addr;
 
 #[cfg(feature = "celo")]
 pub use crate::CeloMiddleware;
@@ -40,7 +41,7 @@ use std::{
 };
 use tracing::trace;
 use tracing_futures::Instrument;
-use url::{ParseError, Url};
+use url::{Host, ParseError, Url};
 
 /// Node Clients
 #[derive(Copy, Clone)]
@@ -1443,11 +1444,30 @@ impl ProviderExt for Provider<HttpProvider> {
 /// ```
 /// use ethers_providers::is_local_endpoint;
 /// assert!(is_local_endpoint("http://localhost:8545"));
+/// assert!(is_local_endpoint("http://169.254.0.0:8545"));
 /// assert!(is_local_endpoint("http://127.0.0.1:8545"));
+/// assert!(!is_local_endpoint("http://206.71.50.230:8545"));
+/// assert!(!is_local_endpoint("http://[2001:0db8:85a3:0000:0000:8a2e:0370:7334]"));
+/// assert!(is_local_endpoint("http://[::1]"));
+/// assert!(!is_local_endpoint("havenofearlucishere"));
 /// ```
 #[inline]
-pub fn is_local_endpoint(url: &str) -> bool {
-    url.contains("127.0.0.1") || url.contains("localhost")
+pub fn is_local_endpoint(endpoint: &str) -> bool {
+    if let Ok(url) = Url::parse(endpoint) {
+        if let Some(host) = url.host() {
+            match host {
+                Host::Domain(domain) => return domain.contains("localhost"),
+                Host::Ipv4(ipv4) => {
+                    return ipv4 == Ipv4Addr::LOCALHOST ||
+                        ipv4.is_link_local() ||
+                        ipv4.is_loopback() ||
+                        ipv4.is_private()
+                }
+                Host::Ipv6(ipv6) => return ipv6.is_loopback(),
+            }
+        }
+    }
+    false
 }
 
 #[cfg(test)]