Added a query function for not yet supported endpoints

Sources/LetterboxdAPI/LetterboxdAPI+Query.swift

@@ -0,0 +1,37 @@
+//
+//  LetterboxdAPI+Query.swift
+//  LetterboxdAPI
+//
+//  Created by Gianpiero Spinelli.
+//
+
+import Foundation
+
+public extension LetterboxdAPI {
+    /// Generic query for any endpoint on the letterboxd APIs
+    /// - Parameters:
+    ///   - path: the endpoint, eg: `/film/id`
+    ///   - parameters: the parameters for the endpoint
+    ///   - body: if the endpoint supports a body, please insert use it here
+    ///   - completion: the completion of the request
+    func query<D: Decodable>(path: String, parameters: [String: String], body: String? = nil, completion: @escaping (Result<D, Error>) -> Void) {
+        query(path: path, parameters: parameters, body: body?.data(using: .utf8), completion: completion)
+    }
+
+    /// Generic query for any endpoint on the letterboxd APIs
+    /// - Parameters:
+    ///   - path: the endpoint, eg: `/film/id`
+    ///   - parameters: the parameters for the endpoint
+    ///   - body: if the endpoint supports a body, please insert use it here
+    ///   - completion: the completion of the request
+    func query<D: Decodable>(path: String, parameters: [String: String], body: Data? = nil, completion: @escaping (Result<D, Error>) -> Void) {
+        let url = URLBuilder.url(path: path, body: body, params: parameters)
+
+        guard let request = generateRequest(url: url, method: .get) else {
+            completion(.failure(LetterboxdAPIError.generatingRequest))
+            return
+        }
+
+        processRequest(request: request, completion: completion)
+    }
+}

Sources/LetterboxdAPI/LetterboxdAPI.swift

@@ -71,4 +71,18 @@ public class LetterboxdAPI {
         task.resume()
         return task
     }
+
+    @discardableResult
+    internal func processRequest(request: URLRequest, completion: @escaping (Result<Data, Error>) -> Void) -> URLSessionTask {
+        let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
+            guard error == nil, let data = data else {
+                completion(.failure(error!))
+                return
+            }
+
+            completion(.success(data))
+        }
+        task.resume()
+        return task
+    }
 }