Replaces local, fastly backend config with dynamic backends. (#49)

* Replaces local, fastly backend config with dynamic backends.

Only required config is origin_url.
Origin backend is deprecated.

* Removes prebid config for dynamic prebid backend

* completely removes origin_backend setting

* update CHANGELOG.md

Author: ChristianPavilonis

CHANGELOG.md

@@ -6,6 +6,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.2.0] - 2025-10-14
+
+### Changed
+- Publisher origin backend now uses `publisher.origin_url` to dynamically create backends, deprecated `publisher.origin_backend` field
+- Prebid backend now uses `prebid.server_url` to dynamically create backends, deprecated `prebid.prebid_backend` field
+- Removed static backend definitions from `fastly.toml` for publisher and prebid
+
+### Added
+- Added `.rust-analyzer.json` for improved development environment support with Neovim/rust-analyzer
+
 ## [1.1.0] - 2025-10-05
 
 ### Added
@@ -82,7 +92,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial implementation of Trusted Server
 
-[Unreleased]:https://github.com/IABTechLab/trusted-server/compare/v1.0.6...HEAD
+[Unreleased]:https://github.com/IABTechLab/trusted-server/compare/v1.2.0...HEAD
+[1.2.0]:https://github.com/IABTechLab/trusted-server/compare/v1.1.0...v1.2.0
+[1.1.0]:https://github.com/IABTechLab/trusted-server/compare/v1.0.6...v1.1.0
 [1.0.6]:https://github.com/IABTechLab/trusted-server/compare/v1.0.5...v1.0.6
 [1.0.5]:https://github.com/IABTechLab/trusted-server/compare/v1.0.4...v1.0.5
 [1.0.4]:https://github.com/IABTechLab/trusted-server/compare/v1.0.3...v1.0.4

crates/common/src/backend.rs

@@ -1,7 +1,8 @@
 use std::time::Duration;
 
-use error_stack::Report;
+use error_stack::{Report, ResultExt};
 use fastly::backend::Backend;
+use url::Url;
 
 use crate::error::TrustedServerError;
 
@@ -66,6 +67,21 @@ pub fn ensure_origin_backend(
         }
     }
 }
+pub fn ensure_backend_from_url(origin_url: &str) -> Result<String, Report<TrustedServerError>> {
+    let parsed_url = Url::parse(origin_url).change_context(TrustedServerError::Proxy {
+        message: format!("Invalid origin_url: {}", origin_url),
+    })?;
+
+    let scheme = parsed_url.scheme();
+    let host = parsed_url.host_str().ok_or_else(|| {
+        Report::new(TrustedServerError::Proxy {
+            message: "Missing host in origin_url".to_string(),
+        })
+    })?;
+    let port = parsed_url.port();
+
+    ensure_origin_backend(scheme, host, port)
+}
 
 #[cfg(test)]
 mod tests {

crates/common/src/prebid.rs

@@ -8,6 +8,7 @@ use fastly::http::{header, Method, StatusCode};
 use fastly::{Error, Request, Response};
 use serde_json::json;
 
+use crate::backend::ensure_backend_from_url;
 use crate::constants::{
     HEADER_SYNTHETIC_FRESH, HEADER_SYNTHETIC_TRUSTED_SERVER, HEADER_X_COMPRESS_HINT,
     HEADER_X_CONSENT_ADVERTISING, HEADER_X_FORWARDED_FOR,
@@ -194,10 +195,17 @@ impl PrebidRequest {
             id
         );
 
-        req.set_body_json(&prebid_body)?;
+        // TrustedServerError doesn't implement std::error::Error
+        match ensure_backend_from_url(&settings.prebid.server_url) {
+            Ok(backend_name) => {
+                req.set_body_json(&prebid_body)?;
 
-        let resp = req.send("prebid_backend")?;
-        Ok(resp)
+                let resp = req.send(backend_name)?;
+                Ok(resp)
+            }
+
+            Err(e) => fastly::error::bail!("Could not get prebid backend: {}", e),
+        }
     }
 }
 

crates/common/src/prebid_proxy.rs

@@ -9,6 +9,7 @@ use fastly::http::{header, Method, StatusCode};
 use fastly::{Request, Response};
 use serde_json::{json, Value};
 
+use crate::backend::ensure_backend_from_url;
 use crate::constants::{HEADER_SYNTHETIC_FRESH, HEADER_SYNTHETIC_TRUSTED_SERVER};
 use crate::error::TrustedServerError;
 use crate::gdpr::get_consent_from_request;
@@ -78,10 +79,12 @@ pub async fn handle_prebid_auction(
 
     log::info!("Sending request to Prebid Server");
 
+    let backend_name = ensure_backend_from_url(&settings.prebid.server_url)?;
+
     // 5. Send to PBS and get response
     let mut pbs_response =
         pbs_req
-            .send("prebid_backend")
+            .send(backend_name)
             .change_context(TrustedServerError::Prebid {
                 message: "Failed to send request to Prebid Server".to_string(),
             })?;
@@ -175,9 +178,12 @@ pub async fn handle_prebid_cookie_sync(
         })?;
 
     // 4. Get response and transform sync URLs
+
+    let backend_name = ensure_backend_from_url(&settings.prebid.server_url)?;
+
     let mut pbs_response =
         pbs_req
-            .send("prebid_backend")
+            .send(backend_name)
             .change_context(TrustedServerError::Prebid {
                 message: "Failed to send cookie sync request".to_string(),
             })?;

crates/common/src/publisher.rs

@@ -2,6 +2,7 @@ use error_stack::{Report, ResultExt};
 use fastly::http::{header, StatusCode};
 use fastly::{Body, Request, Response};
 
+use crate::backend::ensure_backend_from_url;
 use crate::http_util::serve_static_with_etag;
 
 use crate::constants::{
@@ -359,17 +360,20 @@ pub fn handle_publisher_request(
         has_synthetic_cookie
     );
 
-    // Extract host from the origin_url using the Publisher's origin_host method
+    let backend_name = ensure_backend_from_url(&settings.publisher.origin_url)?;
     let origin_host = settings.publisher.origin_host();
 
-    log::info!("Setting host header to: {}", origin_host);
+    log::info!(
+        "Proxying to dynamic backend: {} (from {})",
+        backend_name,
+        settings.publisher.origin_url
+    );
     req.set_header("host", &origin_host);
 
-    // Send the request to the origin backend
     let mut response = req
-        .send(&settings.publisher.origin_backend)
+        .send(&backend_name)
         .change_context(TrustedServerError::Proxy {
-            message: "Failed to proxy request".to_string(),
+            message: "Failed to proxy request to origin".to_string(),
         })?;
 
     // Log all response headers for debugging

crates/common/src/settings.rs

@@ -21,7 +21,6 @@ pub struct AdServer {
 pub struct Publisher {
     pub domain: String,
     pub cookie_domain: String,
-    pub origin_backend: String,
     pub origin_url: String,
     /// Secret used to encrypt/decrypt proxied URLs in `/first-party/proxy`.
     /// Keep this secret stable to allow existing links to decode.
@@ -38,7 +37,6 @@ impl Publisher {
     /// let publisher = Publisher {
     ///     domain: "example.com".to_string(),
     ///     cookie_domain: ".example.com".to_string(),
-    ///     origin_backend: "edgepubs_main_be".to_string(),
     ///     origin_url: "https://origin.example.com:8080".to_string(),
     ///     proxy_secret: "proxy-secret".to_string(),
     /// };
@@ -530,7 +528,6 @@ mod tests {
         let publisher = Publisher {
             domain: "example.com".to_string(),
             cookie_domain: ".example.com".to_string(),
-            origin_backend: "publisher_origin".to_string(),
             origin_url: "https://origin.example.com:8080".to_string(),
             proxy_secret: "test-secret".to_string(),
         };
@@ -540,7 +537,6 @@ mod tests {
         let publisher = Publisher {
             domain: "example.com".to_string(),
             cookie_domain: ".example.com".to_string(),
-            origin_backend: "publisher_origin".to_string(),
             origin_url: "https://origin.example.com".to_string(),
             proxy_secret: "test-secret".to_string(),
         };
@@ -550,7 +546,6 @@ mod tests {
         let publisher = Publisher {
             domain: "example.com".to_string(),
             cookie_domain: ".example.com".to_string(),
-            origin_backend: "publisher_origin".to_string(),
             origin_url: "http://localhost:9090".to_string(),
             proxy_secret: "test-secret".to_string(),
         };
@@ -560,7 +555,6 @@ mod tests {
         let publisher = Publisher {
             domain: "example.com".to_string(),
             cookie_domain: ".example.com".to_string(),
-            origin_backend: "publisher_origin".to_string(),
             origin_url: "localhost:9090".to_string(),
             proxy_secret: "test-secret".to_string(),
         };
@@ -570,7 +564,6 @@ mod tests {
         let publisher = Publisher {
             domain: "example.com".to_string(),
             cookie_domain: ".example.com".to_string(),
-            origin_backend: "publisher_origin".to_string(),
             origin_url: "http://192.168.1.1:8080".to_string(),
             proxy_secret: "test-secret".to_string(),
         };
@@ -580,7 +573,6 @@ mod tests {
         let publisher = Publisher {
             domain: "example.com".to_string(),
             cookie_domain: ".example.com".to_string(),
-            origin_backend: "publisher_origin".to_string(),
             origin_url: "http://[::1]:8080".to_string(),
             proxy_secret: "test-secret".to_string(),
         };

fastly.toml

@@ -44,8 +44,7 @@ build = """
 
         [local_server.backends.equativ_ad_api_2]
             url = "https://adapi-srv-eu.smartadserver.com"
-        [local_server.backends.prebid_backend]
-            url = "http://68.183.113.79:8000"
+
         [local_server.backends.gam_backend]
             url = "https://securepubads.g.doubleclick.net"
         [local_server.backends.wordpress_backend]
@@ -67,10 +66,6 @@ build = """
         [local_server.backends.googleads_doubleclick_backend]
             url = "https://securepubads.g.doubleclick.net"
 
-        [local_server.backends.publisher_origin]
-            url = "http://localhost:9090"
-            override_host = "localhost:9090"
-        
         # Backend for proxying ad creatives and tracking pixels
         [local_server.backends.ad_cdn_backend]
             url = "https://cdn.adsrvr.org"  # Default, will be overridden dynamically

trusted-server.toml

@@ -5,7 +5,6 @@ sync_url = "https://adapi-srv-eu.smartadserver.com/ac?pgid=2040327&fmtid=137675&
 [publisher]
 domain = "test-publisher.com"
 cookie_domain = ".test-publisher.com"
-origin_backend = "publisher_origin"
 origin_url = "https://origin.test-publisher.com"
 proxy_secret = "change-me-proxy-secret"