commit e8d964c3926342ae0ec22ebb23ca51778b71d5f1
Author: Edward Shen <code@eddie.sh>
Date:   Sun Oct 3 19:10:53 2021 -0700

    initial commit

diff --git a/.gitignore b/.gitignore
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+tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3a358a4
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,57 @@
+#![warn(clippy::pedantic, clippy::nursery)]
+
+use axum::extract::ConnectInfo;
+use axum::handler::get;
+use axum::http::{HeaderMap, HeaderValue};
+use axum::{Router, Server};
+use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr};
+
+#[tokio::main]
+async fn main() {
+    let app = Router::new().route("/", get(root));
+
+    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
+    Server::bind(&addr)
+        .serve(app.into_make_service_with_connect_info::<SocketAddr, _>())
+        .await
+        .unwrap();
+}
+
+#[allow(clippy::unused_async)]
+async fn root(header: HeaderMap, ConnectInfo(socket_info): ConnectInfo<SocketAddr>) -> String {
+    if let Some(Ok(value)) = header.get("Forwarded").map(HeaderValue::to_str) {
+        let match_str = "or="; // the `for` key is case-insensitive
+        let maybe_index = value.find(match_str);
+        if let Some(index) = maybe_index {
+            let ip_start = value.split_at(index + match_str.len()).1;
+
+            let mut chars = ip_start.chars().peekable();
+
+            if let Some('"') = chars.peek() {
+                // We're dealing with an ipv6 address
+
+                // skip first character, since we know it's an `"`
+                chars.next();
+                let res: String = chars.take_while(|c| *c != '"').collect();
+                if res.parse::<Ipv6Addr>().is_ok() {
+                    return res;
+                }
+            } else {
+                let res: String = chars.take_while(|c| *c != 'c').collect();
+                if res.parse::<Ipv4Addr>().is_ok() {
+                    return res;
+                }
+            }
+        }
+    }
+
+    if let Some(Ok(value)) = header.get("X-Forwarded-For").map(HeaderValue::to_str) {
+        return match value.split_once(',').map(|v| v.0) {
+            Some(v) => v,
+            None => value,
+        }
+        .to_string();
+    }
+
+    socket_info.ip().to_string()
+}