Add fetch doc version endpoints

backend/sync_server/src/server/fetch_document_version.rs

@@ -0,0 +1,57 @@
+use anyhow::anyhow;
+use axum::extract::{Path, State};
+use axum_extra::{
+    TypedHeader,
+    headers::{Authorization, authorization::Bearer},
+};
+use axum_jsonschema::Json;
+use schemars::JsonSchema;
+use serde::Deserialize;
+
+use super::{app_state::AppState, auth::auth};
+use crate::{
+    database::models::{DocumentId, DocumentVersion, VaultId, VaultUpdateId},
+    errors::{SyncServerError, not_found_error, server_error},
+};
+
+// This is required for aide to infer the path parameter types and names
+#[derive(Deserialize, JsonSchema)]
+pub struct PathParams {
+    vault_id: VaultId,
+    document_id: DocumentId,
+    vault_update_id: VaultUpdateId,
+}
+
+#[axum::debug_handler]
+pub async fn fetch_document_version(
+    TypedHeader(auth_header): TypedHeader<Authorization<Bearer>>,
+    Path(PathParams {
+        vault_id,
+        document_id,
+        vault_update_id,
+    }): Path<PathParams>,
+    State(state): State<AppState>,
+) -> Result<Json<DocumentVersion>, SyncServerError> {
+    auth(&state, auth_header.token())?;
+
+    let result = state
+        .database
+        .get_document_version(&vault_id, vault_update_id, None)
+        .await
+        .map_err(server_error)?
+        .map(Ok)
+        .unwrap_or_else(|| {
+            Err(not_found_error(anyhow!(
+                "Document with vault update id `{vault_update_id}` not found",
+            )))
+        })?;
+
+    if result.document_id != document_id {
+        return Err(not_found_error(anyhow!(
+            "Document with document id `{document_id}` does not have a version with id \
+             `{vault_update_id}`",
+        )));
+    }
+
+    Ok(Json(result.into()))
+}