controllers/helpers/pagination: Add data access page link to high page offset error message (#7817)

Author: Turbo87

src/controllers/helpers/pagination.rs

@@ -103,7 +103,11 @@ impl PaginationOptionsBuilder {
                         && is_useragent_or_ip_blocked(config, req)
                     {
                         req.request_log().add("cause", "large page offset");
-                        return Err(bad_request("requested page offset is too large"));
+
+                        let error =
+                            format!("Page {numeric_page} is unavailable for performance reasons. Please take a look at https://crates.io/data-access for alternatives.");
+
+                        return Err(bad_request(error));
                     }
                 }
 

src/tests/pagination.rs

@@ -24,6 +24,6 @@ fn pagination_blocks_ip_from_cidr_block_list() {
     assert_eq!(response.status(), StatusCode::BAD_REQUEST);
     assert_eq!(
         response.into_json(),
-        json!({ "errors": [{ "detail": "requested page offset is too large" }] })
+        json!({ "errors": [{ "detail": "Page 2 is unavailable for performance reasons. Please take a look at https://crates.io/data-access for alternatives." }] })
     );
 }