Uhhh... the documentation is shit; still lost

Sources/OpenFoodFacts/OpenFoodFacts.swift

@@ -29,6 +29,40 @@ public class OpenFoodFactsClient {
             return try JSONDecoder().decode(ProductResponse.self, from: data)
         }
     }
+
+    public struct SearchQuery {
+        public let additivesTags: String?
+        public let allergensTags: String?
+        public let brandsTags: String?
+        public let categoriesTags: String?
+        public let countriesTagsEn: String?
+        public let embCodesTags: String?
+        public let labelsTags: String?
+        public let manufacturingPlacesTags: String?
+        public let nutritionGradesTags: String?
+        public let originsTags: String?
+        public let packagingTagsDe: String?
+        public let purchasePlacesTags: String?
+    }
+
+    public func search(_ productName: String, queryParams: SearchQuery? = nil) async throws -> SearchResponse {
+        let qp = Mirror(reflecting: queryParams ?? {})
+        var s: String = "?product_name=\(productName)&"
+        for case let (label?, value) in qp.children {
+            s += label.camelCaseToSnakeCase() + "=" + (value as! String) + "&"
+        }
+        guard let endpoint = baseURL?.appendingPathComponent("search\(s)") else { throw OFFError.invalidURL }
+        var request = URLRequest(url: endpoint)
+        request.setValue("application/json", forHTTPHeaderField: "accept")
+
+        let (data, response) = try await URLSession.shared.data(for: request)
+        guard let response = response as? HTTPURLResponse, response.statusCode == 200 else {
+            throw OFFError.invalidResponse
+        }
+        do {
+            return try JSONDecoder().decode(SearchResponse.self, from: data)
+        }
+    }
 }
 
 enum OFFError: Error {