[2/4] feat(api): E2B build-context upload endpoints and configuration

config/default.toml

@@ -83,6 +83,30 @@ peer_discovery_refresh_interval_secs = 5
 # Timeout for custom extension HTTP calls, in milliseconds.
 # timeout_ms = 5000
 
+[template_build]
+# Build-context upload settings backing the E2B SDK's COPY support
+# (GET /templates/{templateID}/files/{hash} plus the returned upload URL).
+# Maximum accepted size for one uploaded build-context archive, in MiB.
+# files_max_upload_mib = 1024
+# Maximum size one build-context archive may expand to once decompressed, in MiB.
+# files_max_context_mib = 4096
+# Cap on the combined on-disk size of all build-context archives one build spec
+# may reference, in MiB.
+# files_max_build_context_mib = 4096
+# How long an issued upload URL stays valid, in seconds.
+# files_url_ttl_secs = 3600
+# How long one build-context upload request may run before the server gives up
+# and responds 408, in seconds.
+# files_upload_timeout_secs = 300
+# Optional external base URL used when building upload URLs. Defaults to
+# "http://{Host header}" of the upload-link request, which matches
+# direct-node and bundled-gateway deployments.
+# Any TLS-terminated, gateway-fronted, or multi-hop deployment MUST set this to
+# the external origin clients reach: the fallback derives the URL from the
+# request Host header with plain http, and that upload URL carries a bearer
+# token in its query string.
+# public_base_url = "https://agentenv.example.com"
+
 [cluster]
 # Shared gRPC endpoint for cluster-level services such as scheduler heartbeat
 # reporting and P2P peer discovery (e.g. "http://127.0.0.1:9090").

src/api/build_files.rs

@@ -0,0 +1,287 @@
+//! Hand-written upload endpoint for template build-context archives.
+//!
+//! `GET /templates/{templateID}/files/{hash}` (generated API) hands the E2B
+//! SDK a bearer URL pointing here; the SDK then `PUT`s a tar archive with no
+//! authentication headers. The durable random token embedded in the URL is
+//! therefore the credential, and this route stays outside the generated
+//! router so the archive can stream to disk instead of buffering in memory.
+
+use std::time::Duration;
+
+use axum::extract::{Path, Request, State};
+use axum::http::StatusCode;
+use axum::response::{IntoResponse, Response};
+use axum::routing::put;
+use axum::{Json, Router};
+use futures::StreamExt;
+use tokio::io::AsyncWriteExt;
+use tracing::{debug, warn};
+
+use agentenv_http_server::models;
+
+use super::ApiImpl;
+use crate::cfg::ConfigManager;
+use crate::snapshot::repository::build_files::is_valid_build_files_hash;
+
+pub(crate) fn router<I>(api_impl: I) -> Router
+where
+    I: AsRef<ApiImpl> + Clone + Send + Sync + 'static,
+{
+    Router::new()
+        .route(
+            "/templates/{template_id}/files/{hash}/content",
+            put(upload_build_archive::<I>),
+        )
+        .with_state(api_impl)
+}
+
+struct UploadQuery {
+    expires: i64,
+    token: String,
+}
+
+fn parse_upload_query(query: Option<&str>) -> Option<UploadQuery> {
+    let query = query?;
+    let mut expires: Option<i64> = None;
+    let mut token: Option<String> = None;
+    for (key, value) in url::form_urlencoded::parse(query.as_bytes()) {
+        match key.as_ref() {
+            "expires" => expires = value.parse().ok(),
+            "token" => token = Some(value.into_owned()),
+            _ => {}
+        }
+    }
+    Some(UploadQuery {
+        expires: expires?,
+        token: token?,
+    })
+}
+
+fn error_response(code: StatusCode, message: impl Into<String>) -> Response {
+    (
+        code,
+        Json(models::Error::new(code.as_u16() as i32, message.into())),
+    )
+        .into_response()
+}
+
+async fn upload_build_archive<I>(
+    State(api_impl): State<I>,
+    Path((template_id, hash)): Path<(String, String)>,
+    request: Request,
+) -> Response
+where
+    I: AsRef<ApiImpl> + Clone + Send + Sync + 'static,
+{
+    let api: &ApiImpl = api_impl.as_ref();
+
+    if !is_valid_build_files_hash(&hash) {
+        return error_response(
+            StatusCode::BAD_REQUEST,
+            format!("invalid build files hash '{hash}'"),
+        );
+    }
+    let Some(store) = api.snapshot_manager().template_build_files() else {
+        return error_response(
+            StatusCode::BAD_REQUEST,
+            "the configured snapshot backend does not support build-context uploads",
+        );
+    };
+    let Some(query) = parse_upload_query(request.uri().query()) else {
+        return error_response(
+            StatusCode::UNAUTHORIZED,
+            "upload URL is missing the expires/token query parameters",
+        );
+    };
+
+    // Verification does not consume the grant: consumption happens only after
+    // the archive has been durably published, so an upload that fails while
+    // streaming, staging, or storing the body stays retryable with this URL.
+    let now_unix = chrono::Utc::now().timestamp();
+    let authorized = match store
+        .verify_upload_grant(&query.token, &template_id, &hash, query.expires, now_unix)
+        .await
+    {
+        Ok(authorized) => authorized,
+        Err(error) => {
+            warn!(error = %error, "failed to verify build-file upload grant");
+            return error_response(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "failed to validate upload grant",
+            );
+        }
+    };
+    if !authorized {
+        return error_response(
+            StatusCode::UNAUTHORIZED,
+            "upload grant is invalid, expired, or already used; request a fresh upload link",
+        );
+    }
+
+    let max_bytes = ConfigManager::global_config()
+        .template_build
+        .files_max_upload_mib
+        .saturating_mul(1024 * 1024);
+    let upload_timeout = Duration::from_secs(
+        ConfigManager::global_config()
+            .template_build
+            .files_upload_timeout_secs,
+    );
+
+    // `staged` is the drop guard that removes the staging file on every early
+    // return below, so it must stay bound for the rest of the handler.
+    let staged = match tokio::task::spawn_blocking(tempfile::NamedTempFile::new).await {
+        Ok(Ok(staged)) => staged,
+        Ok(Err(error)) => {
+            warn!(error = %error, "failed to create staging file for build archive");
+            return error_response(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "failed to stage build archive",
+            );
+        }
+        Err(error) => {
+            warn!(error = %error, "failed to join staging file creation for build archive");
+            return error_response(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "failed to stage build archive",
+            );
+        }
+    };
+    let staged_path = staged.path().to_path_buf();
+
+    let mut file = match tokio::fs::File::create(&staged_path).await {
+        Ok(file) => file,
+        Err(error) => {
+            warn!(error = %error, "failed to open staging file for build archive");
+            return error_response(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "failed to stage build archive",
+            );
+        }
+    };
+
+    let consume_body = async {
+        let mut total: u64 = 0;
+        let mut stream = request.into_body().into_data_stream();
+        while let Some(chunk) = stream.next().await {
+            let chunk = match chunk {
+                Ok(chunk) => chunk,
+                Err(error) => {
+                    debug!(error = %error, "build archive upload stream aborted");
+                    return Err(error_response(
+                        StatusCode::BAD_REQUEST,
+                        "failed to read the uploaded archive body",
+                    ));
+                }
+            };
+            total += chunk.len() as u64;
+            if total > max_bytes {
+                return Err(error_response(
+                    StatusCode::PAYLOAD_TOO_LARGE,
+                    format!("build archive exceeds the configured limit of {max_bytes} bytes"),
+                ));
+            }
+            if let Err(error) = file.write_all(&chunk).await {
+                warn!(error = %error, "failed to write staged build archive");
+                return Err(error_response(
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    "failed to stage build archive",
+                ));
+            }
+        }
+        if let Err(error) = file.flush().await {
+            warn!(error = %error, "failed to flush staged build archive");
+            return Err(error_response(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "failed to stage build archive",
+            ));
+        }
+        Ok(total)
+    };
+
+    let total = match tokio::time::timeout(upload_timeout, consume_body).await {
+        Ok(Ok(total)) => total,
+        Ok(Err(response)) => return response,
+        Err(_) => {
+            debug!(template_id, hash, "build archive upload timed out");
+            return error_response(
+                StatusCode::REQUEST_TIMEOUT,
+                format!(
+                    "build archive upload did not complete within {} seconds",
+                    upload_timeout.as_secs()
+                ),
+            );
+        }
+    };
+    drop(file);
+
+    // Publishing before the grant is consumed keeps a failed store retryable
+    // with the same URL. An unclaimed replay reaching this point is harmless:
+    // the token authorizes exactly this template_id/hash and `import` is
+    // first-write-wins, so it can neither publish a different key nor change
+    // what is already stored.
+    //
+    // `hash` is the cache key the SDK computed for this build context, not a
+    // digest of the received bytes that the server verified.
+    if let Err(error) = store.import(&hash, &staged_path).await {
+        warn!(error = %error, hash, "failed to import build archive");
+        return error_response(
+            StatusCode::INTERNAL_SERVER_ERROR,
+            "failed to store build archive; the upload can be retried with the same link",
+        );
+    }
+
+    // The archive is published, so the claim only enforces single-use: the
+    // atomic remove/delete picks a single winner among concurrent replays, and
+    // a replay that loses the race is rejected even though the archive it
+    // uploaded is stored. `now_unix` is the timestamp taken before the body was
+    // read, so a slow but authorized upload is not rejected for aging past the
+    // TTL.
+    let claimed = match store
+        .claim_upload_grant(&query.token, &template_id, &hash, query.expires, now_unix)
+        .await
+    {
+        Ok(claimed) => claimed,
+        Err(error) => {
+            warn!(error = %error, "failed to claim build-file upload grant");
+            return error_response(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "failed to validate upload grant",
+            );
+        }
+    };
+    if !claimed {
+        return error_response(
+            StatusCode::UNAUTHORIZED,
+            "upload grant is invalid, expired, or already used; request a fresh upload link",
+        );
+    }
+
+    debug!(
+        template_id,
+        hash,
+        bytes = total,
+        "stored build-context archive"
+    );
+    StatusCode::OK.into_response()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::parse_upload_query;
+
+    #[test]
+    fn upload_query_parses_bearer_token_and_expiry() {
+        let query = parse_upload_query(Some("expires=1234&token=upload-token"))
+            .expect("query should parse");
+        assert_eq!(query.expires, 1234);
+        assert_eq!(query.token, "upload-token");
+    }
+
+    #[test]
+    fn upload_query_requires_both_fields() {
+        assert!(parse_upload_query(Some("expires=1234")).is_none());
+        assert!(parse_upload_query(Some("token=upload-token")).is_none());
+        assert!(parse_upload_query(None).is_none());
+    }
+}

src/api/generated/src/apis/templates.rs

@@ -64,6 +64,22 @@ pub enum TemplatesTemplateIdDeleteResponse {
     Status500_ServerError(models::Error),
 }
 
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+#[must_use]
+#[allow(clippy::large_enum_variant)]
+pub enum TemplatesTemplateIdFilesHashGetResponse {
+    /// Successfully returned the upload link
+    Status201_SuccessfullyReturnedTheUploadLink(models::TemplateBuildFileUpload),
+    /// Bad request
+    Status400_BadRequest(models::Error),
+    /// Authentication error
+    Status401_AuthenticationError(models::Error),
+    /// Not found
+    Status404_NotFound(models::Error),
+    /// Server error
+    Status500_ServerError(models::Error),
+}
+
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 #[must_use]
 #[allow(clippy::large_enum_variant)]
@@ -187,6 +203,19 @@ pub trait Templates<E: std::fmt::Debug + Send + Sync + 'static = ()>:
         path_params: &models::TemplatesTemplateIdDeletePathParams,
     ) -> Result<TemplatesTemplateIdDeleteResponse, E>;
 
+    /// Template build file upload link.
+    ///
+    /// TemplatesTemplateIdFilesHashGet - GET /templates/{templateID}/files/{hash}
+    async fn templates_template_id_files_hash_get(
+        &self,
+
+        method: &Method,
+        host: &Host,
+        cookies: &CookieJar,
+        claims: &Self::Claims,
+        path_params: &models::TemplatesTemplateIdFilesHashGetPathParams,
+    ) -> Result<TemplatesTemplateIdFilesHashGetResponse, E>;
+
     /// List template builds.
     ///
     /// TemplatesTemplateIdGet - GET /templates/{templateID}