Send GET request parameters as query params [SDK-3324]

Auth0/Request.swift

@@ -47,11 +47,20 @@ public struct Request<T, E: Auth0APIError>: Requestable {
     var request: URLRequest {
         let request = NSMutableURLRequest(url: url)
         request.httpMethod = method
-        if !parameters.isEmpty, let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: []) {
-            request.httpBody = httpBody
-            #if DEBUG
-            URLProtocol.setProperty(parameters, forKey: parameterPropertyKey, in: request)
-            #endif
+        if !parameters.isEmpty {
+            if method.caseInsensitiveCompare("GET") == .orderedSame {
+                var urlComponents = URLComponents(url: url, resolvingAgainstBaseURL: true)
+                var queryItems = urlComponents?.queryItems ?? []
+                let newQueryItems = parameters.map { URLQueryItem(name: $0.key, value: String(describing: $0.value)) }
+                queryItems.append(contentsOf: newQueryItems)
+                urlComponents?.queryItems = queryItems
+                request.url = urlComponents?.url ?? url
+            } else if let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: []) {
+                request.httpBody = httpBody
+                #if DEBUG
+                URLProtocol.setProperty(parameters, forKey: parameterPropertyKey, in: request)
+                #endif
+            }
         }
         request.setValue("application/json", forHTTPHeaderField: "Content-Type")
         headers.forEach { name, value in request.setValue(value, forHTTPHeaderField: name) }

Auth0Tests/RequestSpec.swift

@@ -58,6 +58,22 @@ class RequestSpec: QuickSpec {
                     let request = Request(session: URLSession.shared, url: Url, method: "GET", handle: plainJson, parameters: [:], logger: nil, telemetry: Telemetry())
                     expect(request.parameters(["scope": "email phone"]).parameters["scope"] as? String) == "openid email phone"
                 }
+
+                it("should add the parameters as query parameters") {
+                    let request = Request(session: URLSession.shared, url: Url, method: "GET", handle: plainJson, parameters: ["foo": "bar"], logger: nil, telemetry: Telemetry())
+                    expect(request.request.url?.query) == "foo=bar"
+                }
+
+                it("should append the parameters to the existing query parameters") {
+                    let request = Request(session: URLSession.shared, url: URL(string: "\(Url.absoluteString)?foo=bar")!, method: "GET", handle: plainJson, parameters: ["baz": "qux"], logger: nil, telemetry: Telemetry())
+                    expect(request.request.url?.query) == "foo=bar&baz=qux"
+                }
+
+                it("should add the parameters to the request body") {
+                    let request = Request(session: URLSession.shared, url: Url, method: "POST", handle: plainJson, parameters: ["foo": "bar"], logger: nil, telemetry: Telemetry())
+                    let body = try! JSONSerialization.jsonObject(with: request.request.httpBody!, options: []) as! [String: Any]
+                    expect(body["foo"] as? String) == "bar"
+                }
             }
 
             context("headers") {