Google OAuth2 (#33)

Author: codefiesta

README.md

@@ -134,6 +134,7 @@ Although OAuthKit will automatically try to load the `oauth.json` file found ins
 ## OAuth Providers
 * [Github](https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/authorizing-oauth-apps)
 * [Google](https://developers.google.com/identity/protocols/oauth2)
+	* **Important**: When creating a Google OAuth2 application from the [Google API Console](https://console.developers.google.com/) create an OAuth 2.0 Client type of Web Application (not iOS).
 * [Instagram](https://developers.facebook.com/docs/instagram-basic-display-api/guides/getting-access-tokens-and-permissions)
 * [Microsoft](https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-auth-code-flow)
 * [Slack](https://api.slack.com/authentication/oauth-v2)

Sources/OAuthKit/OAuth.swift

@@ -406,6 +406,7 @@ public extension OAuth {
         queryItems.append(URLQueryItem(name: "client_secret", value: provider.clientSecret))
         queryItems.append(URLQueryItem(name: "code", value: code))
         queryItems.append(URLQueryItem(name: "redirect_uri", value: provider.redirectURI))
+        queryItems.append(URLQueryItem(name: "grant_type", value: "authorization_code"))
         urlComponents.queryItems = queryItems
         guard let url = urlComponents.url else {
             publish(state: .empty)

Tests/OAuthKitTests/Resources/oauth.json

@@ -11,5 +11,19 @@
             "user",
             "repo"
         ]
+    },
+    {
+        "id": "Google",
+        "authorizationURL": "https://accounts.google.com/o/oauth2/v2/auth",
+        "accessTokenURL": "https://oauth2.googleapis.com/token",
+        "clientID": "CLIENT_ID",
+        "clientSecret": "CLIENT_SECRET",
+        "redirectURI": "https://github.com/codefiesta/",
+        "scope": [
+            "https://www.googleapis.com/auth/userinfo.email",
+            "https://www.googleapis.com/auth/userinfo.profile",
+            "openid"
+        ]
     }
+
 ]