Pass the full domain::Settings into the proxy code

.dev-config.yml

@@ -5,7 +5,7 @@ domain:
   builtins:
     foo:
       kind: proxy
-      url: ok
+      url: http://ok
     bar:
       kind: git
       url: a

src/domain/manager.rs

@@ -32,9 +32,6 @@ pub enum GetFileError {
     #[error("file not found")]
     FileNotFound,
 
-    #[error("origin is of kind proxy")]
-    OriginIsProxy { url: String },
-
     #[error(transparent)]
     Unexpected(#[from] unexpected::Error),
 }
@@ -249,8 +246,8 @@ impl Manager for ManagerImpl {
     ) -> Result<util::BoxByteStream, GetFileError> {
         let config = self.domain_store.get(domain)?;
 
-        if let origin::Descr::Proxy { url } = config.origin_descr {
-            return Err(GetFileError::OriginIsProxy { url });
+        if let origin::Descr::Proxy { .. } = config.origin_descr {
+            return Err(unexpected::Error::from("origin is proxy, can't serve file").into());
         }
 
         let f = self.origin_store.get_file(&config.origin_descr, path)?;

src/error/unexpected.rs

@@ -22,7 +22,7 @@ impl Error {
         let mut w = String::new();
 
         if let Some(prefix) = prefix {
-            write!(w, "{prefix}").expect("error writing prefix");
+            write!(w, "{prefix}: ").expect("error writing prefix");
         }
 
         write!(w, "{body}").expect("error formatting body");

src/main.rs

@@ -78,6 +78,14 @@ async fn main() {
             config.service.dns_records.push(primary_cname);
         }
 
+        for (domain, builtin_domain) in &config.domain.builtins {
+            if let domani::origin::Descr::Proxy { ref url } = builtin_domain.settings.origin_descr {
+                if let Err(e) = domani::origin::proxy::validate_proxy_url(url) {
+                    panic!("invalid config for builtin domain {domain}: {e}");
+                }
+            }
+        }
+
         config
     };
 

src/origin/proxy.rs

@@ -1,4 +1,5 @@
 use crate::error::unexpected::{self, Mappable};
+use crate::{domain, origin};
 use http::header::HeaderValue;
 use std::{net, str::FromStr};
 
@@ -6,27 +7,43 @@ use std::{net, str::FromStr};
 // being served on, it can't be abstracted out into a simple "get_file" operation like other
 // origins.
 
+pub fn validate_proxy_url(proxy_url: &str) -> unexpected::Result<()> {
+    let parsed_proxy_url =
+        http::Uri::from_str(proxy_url).or_unexpected_while("parsing proxy url {proxy_url}")?;
+
+    let scheme = parsed_proxy_url.scheme().map_unexpected_while(|| {
+        format!("expected a scheme of http in the proxy url {proxy_url}")
+    })?;
+
+    if scheme != "http" {
+        return Err(unexpected::Error::from(
+            format!("scheme of proxy url {proxy_url} should be 'http'",).as_str(),
+        ));
+    }
+
+    Ok(())
+}
+
 pub async fn serve_http_request(
+    settings: &domain::Settings,
     client_ip: net::IpAddr,
-    proxy_url: &str,
     mut req: hyper::Request<hyper::Body>,
     req_is_https: bool,
 ) -> unexpected::Result<hyper::Response<hyper::Body>> {
-    let parsed_proxy_url =
-        http::Uri::from_str(proxy_url).or_unexpected_while("parsing proxy url")?;
+    let proxy_url = if let origin::Descr::Proxy { ref url } = settings.origin_descr {
+        url
+    } else {
+        panic!("non-proxy domain settings passed in: {settings:?}")
+    };
 
-    let scheme = parsed_proxy_url
-        .scheme()
-        .or_unexpected_while("expected a scheme of http in the proxy url")?;
-    if scheme != "http" {
-        return Err(unexpected::Error::from("proxy url scheme should be 'http"));
-    }
+    let parsed_proxy_url =
+        http::Uri::from_str(proxy_url).or_unexpected_while("parsing proxy url {proxy_url}")?;
 
     // figure out what the host header should be, based on the host[:port] of the proxy_url
     let host = {
-        let authority = parsed_proxy_url
-            .authority()
-            .or_unexpected_while("getting host from proxy url, there is no host")?;
+        let authority = parsed_proxy_url.authority().or_unexpected_while(format!(
+            "getting host from proxy url {proxy_url}, there is no host"
+        ))?;
 
         let host_and_port;
         let mut host = authority.host();
@@ -51,7 +68,7 @@ pub async fn serve_http_request(
         // ProxyError doesn't actually implement Error :facepalm: so we have to format the error
         // manually
         Err(e) => Err(unexpected::Error::from(
-            format!("error while proxying: {e:?}").as_str(),
+            format!("error while proxying to {proxy_url}: {e:?}").as_str(),
         )),
     }
 }

src/service/http.rs

@@ -165,6 +165,33 @@ impl<'svc> Service {
         req: Request<Body>,
         req_is_https: bool,
     ) -> Response<Body> {
+        // first check if the domain is backed by a proxy, and deal with that first
+        match self.domain_manager.get_settings(&domain) {
+            Ok(settings) => {
+                if let origin::Descr::Proxy { .. } = settings.origin_descr {
+                    return origin::proxy::serve_http_request(
+                        &settings,
+                        client_ip,
+                        req,
+                        req_is_https,
+                    )
+                    .await
+                    .unwrap_or_else(|e| {
+                        self.internal_error(format!("proxying {domain}: {e}").as_str())
+                    });
+                }
+                // fall out of match
+            }
+            Err(domain::manager::GetSettingsError::NotFound) => {
+                return self.render_error_page(404, "Domain not found");
+            }
+            Err(domain::manager::GetSettingsError::Unexpected(e)) => {
+                return self.internal_error(
+                    format!("failed to fetch settings for domain {domain}: {e}").as_str(),
+                );
+            }
+        }
+
         let mut path_owned;
         let path = req.uri().path();
 
@@ -185,13 +212,6 @@ impl<'svc> Service {
             Err(domain::manager::GetFileError::FileNotFound) => {
                 self.render_error_page(404, "File not found")
             }
-            Err(domain::manager::GetFileError::OriginIsProxy { url }) => {
-                origin::proxy::serve_http_request(client_ip, &url, req, req_is_https)
-                    .await
-                    .unwrap_or_else(|e| {
-                        self.internal_error(format!("proxying {domain} to {url}: {e}").as_str())
-                    })
-            }
             Err(domain::manager::GetFileError::Unexpected(e)) => {
                 self.internal_error(format!("failed to fetch file {path}: {e}").as_str())
             }
@@ -432,7 +452,7 @@ impl<'svc> Service {
             }
         }
 
-        // If a managed domain was given then serve that from its origin
+        // If a managed domain was given then serve that from its origin, which is possibly a proxy
         if let Some(domain) = maybe_host {
             return self
                 .serve_origin(client_ip, domain, req, req_is_https)