OAuth2ImplicitGrantWithQueryParams Subclass for a non-standard case (p2#262)

Handles APIs that return token and other info in the query instead of the fragment.

Author: tschmitz

CONTRIBUTORS.md

@@ -3,6 +3,7 @@ Contributors
 
 Contributors to the codebase, in reverse chronological order:
 
+- Tim Schmitz, @tschmitz
 - Seb Skuse, @sebskuse
 - David Hardiman, @dhardiman
 - Amaury David, @amaurydavid

Sources/Flows/OAuth2ImplicitGrantWithQueryParams.swift

@@ -0,0 +1,53 @@
+//
+//  OAuth2ImplicitGrantWithQueryParams.swift
+//  OAuth2
+//
+//  Created by Tim Schmitz on 5/3/18.
+//  Copyright 2018 Tim Schmitz
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+
+
+import Foundation
+#if !NO_MODULE_IMPORT
+import Base
+#endif
+
+
+/**
+ Class to handle OAuth2 implicit grant requests that return params in the query
+ instead of the fragment.
+ */
+open class OAuth2ImplicitGrantWithQueryParams: OAuth2ImplicitGrant {
+
+	override open func handleRedirectURL(_ redirect: URL) {
+		logger?.debug("OAuth2", msg: "Handling redirect URL \(redirect.description)")
+		do {
+			// token should be in the URL query
+			let comp = URLComponents(url: redirect, resolvingAgainstBaseURL: true)
+			guard let query = comp?.query, query.count > 0 else {
+				throw OAuth2Error.invalidRedirectURL(redirect.description)
+			}
+
+			let params = type(of: self).params(fromQuery: query)
+			let dict = try parseAccessTokenResponse(params: params)
+			logger?.debug("OAuth2", msg: "Successfully extracted access token")
+			didAuthorize(withParameters: dict)
+		}
+		catch let error {
+			didFail(with: error.asOAuth2Error)
+		}
+	}
+}