add admin_http post forwarding

signal-gateway-bin/src/admin_http/mod.rs

@@ -0,0 +1,64 @@
+//! Admin HTTP client for forwarding messages to an HTTP server
+//!
+//! This module handles admin messages not handled by the gateway by making an HTTP POST request
+//! with the message as the body, and returning the response body as the reply.
+
+use conf::Conf;
+use signal_gateway::{AdminMessageResponse, MessageHandler, MessageHandlerResult};
+use std::time::Duration;
+
+/// Configuration for the admin HTTP client
+#[derive(Clone, Conf, Debug)]
+pub struct AdminHttpConfig {
+    /// URL to POST admin commands to
+    #[conf(long, env)]
+    pub url: String,
+    /// Timeout for the HTTP request
+    #[conf(long, env, default_value = "5s", value_parser = conf_extra::parse_duration)]
+    pub timeout: Duration,
+}
+
+impl AdminHttpConfig {
+    /// Create a message handler function from this config.
+    ///
+    /// The returned handler makes an HTTP POST request to the configured URL
+    /// with the message as the body, and returns the response body.
+    pub fn into_handler(self) -> MessageHandler {
+        let client = reqwest::Client::builder()
+            .timeout(self.timeout)
+            .build()
+            .expect("Failed to build HTTP client");
+
+        Box::new(move |message: String| {
+            let client = client.clone();
+            let url = self.url.clone();
+            Box::pin(async move { handle_message(&client, &url, message).await })
+        })
+    }
+}
+
+/// Handle a message by POSTing it to the configured HTTP server
+async fn handle_message(
+    client: &reqwest::Client,
+    url: &str,
+    message: String,
+) -> MessageHandlerResult {
+    let response = client
+        .post(url)
+        .body(message)
+        .send()
+        .await
+        .map_err(|err| (502u16, format!("HTTP request failed: {err}").into()))?;
+
+    let status = response.status();
+    let body = response
+        .text()
+        .await
+        .map_err(|err| (502u16, format!("Failed to read response body: {err}").into()))?;
+
+    if !status.is_success() {
+        return Err((status.as_u16(), body.into()));
+    }
+
+    Ok(AdminMessageResponse::new(body))
+}