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Add path-based asset backend proxy routing #668

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Add path-based asset backend proxy routing #668

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fdf632f
asset proxy spec
ChristianPavilonis Apr 28, 2026
53cdf53
Add path-based asset backend proxy routing
ChristianPavilonis Apr 28, 2026
03569f7
fix clippy
ChristianPavilonis Apr 28, 2026
8e3abc0
Add configurable asset path rewrites
ChristianPavilonis May 4, 2026
126e7fe
Honor publisher origin host overrides
ChristianPavilonis May 4, 2026
1efc12d
Rewrite publisher public origin URLs
ChristianPavilonis May 4, 2026
b2edefe
Address asset proxy review feedback
ChristianPavilonis May 5, 2026
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118 changes: 66 additions & 52 deletions crates/trusted-server-adapter-fastly/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,8 @@ use trusted_server_core::http_util::sanitize_forwarded_headers;
use trusted_server_core::integrations::IntegrationRegistry;
use trusted_server_core::platform::RuntimeServices;
use trusted_server_core::proxy::{
handle_first_party_click, handle_first_party_proxy, handle_first_party_proxy_rebuild,
handle_first_party_proxy_sign,
handle_asset_proxy_request, handle_first_party_click, handle_first_party_proxy,
handle_first_party_proxy_rebuild, handle_first_party_proxy_sign,
};
use trusted_server_core::publisher::{
handle_publisher_request, handle_tsjs_dynamic, stream_publisher_body, PublisherResponse,
Expand Down Expand Up @@ -150,6 +150,10 @@ async fn route_request(
let path = req.get_path().to_string();
let method = req.get_method().clone();

let matched_asset_route = matches!(method, Method::GET | Method::HEAD)
.then(|| settings.asset_route_for_path(&path))
.flatten();

// Match known routes and handle them
let result = match (method, path.as_str()) {
// Serve the tsjs library
Expand Down Expand Up @@ -202,62 +206,72 @@ async fn route_request(
}))
}),

// No known route matched, proxy to publisher origin as fallback
// No known route matched, proxy to an asset origin or publisher origin as fallback
_ => {
log::info!(
"No known route matched for path: {}, proxying to publisher origin",
path
);

match runtime_services_for_consent_route(settings, runtime_services) {
Ok(publisher_services) => {
match handle_publisher_request(
settings,
integration_registry,
&publisher_services,
req,
) {
Ok(PublisherResponse::Stream {
mut response,
body,
params,
}) => {
// Streaming path: finalize headers, then stream body to client.
finalize_response(settings, geo_info.as_ref(), &mut response);
let mut streaming_body = response.stream_to_client();
if let Err(e) = stream_publisher_body(
if let Some(asset_route) = matched_asset_route {
log::info!(
"No explicit route matched for path: {}, proxying via asset route prefix {} to {}",
path,
asset_route.prefix,
asset_route.origin_url
);
handle_asset_proxy_request(settings, runtime_services, req, asset_route).await
} else {
log::info!(
"No known route matched for path: {}, proxying to publisher origin",
path
);

match runtime_services_for_consent_route(settings, runtime_services) {
Ok(publisher_services) => {
match handle_publisher_request(
settings,
integration_registry,
&publisher_services,
req,
) {
Ok(PublisherResponse::Stream {
mut response,
body,
&mut streaming_body,
&params,
settings,
integration_registry,
) {
// Headers already committed. Log and abort — client
// sees a truncated response. Standard proxy behavior.
log::error!("Streaming processing failed: {e:?}");
drop(streaming_body);
} else if let Err(e) = streaming_body.finish() {
log::error!("Failed to finish streaming body: {e}");
params,
}) => {
// Streaming path: finalize headers, then stream body to client.
finalize_response(settings, geo_info.as_ref(), &mut response);
let mut streaming_body = response.stream_to_client();
if let Err(e) = stream_publisher_body(
body,
&mut streaming_body,
&params,
settings,
integration_registry,
) {
// Headers already committed. Log and abort — client
// sees a truncated response. Standard proxy behavior.
log::error!("Streaming processing failed: {e:?}");
drop(streaming_body);
} else if let Err(e) = streaming_body.finish() {
log::error!("Failed to finish streaming body: {e}");
}
// Response already sent via stream_to_client()
return None;
}
Ok(PublisherResponse::PassThrough { mut response, body }) => {
// Binary pass-through: reattach body and send via send_to_client().
// This preserves Content-Length and avoids chunked encoding overhead.
// Fastly streams the body from its internal buffer — no WASM
// memory buffering occurs.
response.set_body(body);
Ok(response)
}
Ok(PublisherResponse::Buffered(response)) => Ok(response),
Err(e) => {
log::error!("Failed to proxy to publisher origin: {:?}", e);
Err(e)
}
// Response already sent via stream_to_client()
return None;
}
Ok(PublisherResponse::PassThrough { mut response, body }) => {
// Binary pass-through: reattach body and send via send_to_client().
// This preserves Content-Length and avoids chunked encoding overhead.
// Fastly streams the body from its internal buffer — no WASM
// memory buffering occurs.
response.set_body(body);
Ok(response)
}
Ok(PublisherResponse::Buffered(response)) => Ok(response),
Err(e) => {
log::error!("Failed to proxy to publisher origin: {:?}", e);
Err(e)
}
}
Err(e) => Err(e),
}
Err(e) => Err(e),
}
}
};
Expand Down
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