Solving the “This app is blocked” Error: A Step-by-Step Guide for iPhone 3rd Party Calendar App Developers

Are you tired of encountering the frustrating “This app is blocked” error when trying to integrate your iPhone 3rd party calendar app with Google Calendar? You’re not alone! Many developers have struggled with this issue, but fear not, dear reader, for we’ve got the solution right here.

What’s causing the “This app is blocked” error?

The error occurs when your app tries to access Google Calendar without the necessary permissions. This is usually due to incorrect or missing configurations in your Google Cloud OAuth project. But don’t worry, we’ll walk you through the process of creating a Google Cloud OAuth project and changing the permissions to solve this problem once and for all.

Prerequisites

Before we dive into the solution, make sure you have the following:

• A Google account
• A Google Cloud Console project
• A 3rd party calendar app for iPhone
• Basic knowledge of OAuth and Google Cloud Console

Step 1: Create a Google Cloud OAuth Project

If you haven’t already, create a new Google Cloud OAuth project:

1. Go to the Google Cloud Console and sign in with your Google account.
2. Click on the “Select a project” dropdown menu and then click on “New Project”.
3. Enter a project name, organization, and location, then click on “Create”.

  PROJECT NAME: My Calendar App
  ORGANIZATION: My Company
  LOCATION: us-central1

Step 2: Enable the Google Calendar API

Enable the Google Calendar API for your project:

1. In the Google Cloud Console, navigate to the APIs & Services page.
2. Search for “Google Calendar API” and click on the result.
3. Click on the “Enable” button.

Step 3: Create OAuth Credentials

Create OAuth credentials for your project:

1. In the Google Cloud Console, navigate to the APIs & Services > Credentials page.
2. Click on “Create Credentials” and then “OAuth client ID”.
3. Select “Other” as the application type.
4. Enter a name for your client ID and authorized JavaScript origins.
5. Click on “Create” and copy the client ID and client secret.

  CLIENT ID: 1234567890-abcdefg.apps.googleusercontent.com
  CLIENT SECRET: abcdefg1234567890

Step 4: Configure OAuth Consent Screen

Configure the OAuth consent screen:

1. In the Google Cloud Console, navigate to the APIs & Services > Credentials > OAuth consent screen page.
2. Select “Internal” as the user type.
3. Enter an authorized domain and a product name.
4. Click on “Save”.

Step 5: Update Permissions

Update the permissions for your OAuth client ID:

1. In the Google Cloud Console, navigate to the APIs & Services > Credentials > OAuth client ID page.
2. Click on the “Edit” button.
3. Select the “calendar” scope and click on “Update”.

  SCOPES:
  - https://www.googleapis.com/auth/calendar

Step 6: Implement OAuth in Your iPhone App

Implement OAuth in your iPhone app using the following code:

  <code>
  // Import the necessary frameworks
  import UIKit
  import GTMSessionFetcher
  import GoogleSignIn

  // Set up the Google Sign-In configuration
  let config = GIDConfiguration.init(clientID: "1234567890-abcdefg.apps.googleusercontent.com")

  // Authenticate the user
  GIDSignIn.sharedInstance.signIn(with: config, presenting: self) { user, error in
      if let error = error {
          print("Error: \(error)")
          return
      }

      // Get the access token
      let accessToken = user?.authentication.accessToken

      // Use the access token to authenticate with Google Calendar
      let calendarService = GTLRServicecalendar_v3()
      calendarService.authorizer = GTLRAuthInvokerAuthorization(accessToken: accessToken)

      // Make API calls to Google Calendar
      let queryParams = [" calendarId" : "primary"]
      let query = GTLRcalendarQuery_CalendarListGet.query(with: queryParams)
      calendarService.executeQuery(query) { ticket, object, error in
          if let error = error {
              print("Error: \(error)")
              return
          }

          print("Success!")
      }
  }
  </code>

Conclusion

By following these steps, you should be able to solve the “This app is blocked” error and successfully integrate your iPhone 3rd party calendar app with Google Calendar. Remember to update your OAuth credentials and permissions accordingly. Happy coding!

Keyword	Description
This app is blocked	Error message displayed when a 3rd party calendar app tries to access Google Calendar without necessary permissions.
Google Cloud OAuth project	A project in Google Cloud Console that enables OAuth authentication for 3rd party apps.
OAuth client ID	A unique identifier for your OAuth client, used to authenticate with Google Calendar.
OAuth consent screen	A configuration page in Google Cloud Console that defines the user type and authorized domain for OAuth authentication.

Note: This article assumes you have basic knowledge of OAuth and Google Cloud Console. If you’re new to these topics, it’s recommended to research them before proceeding.

Frequently Asked Questions

If you’re struggling with the frustrating “This app is blocked” error message on your iPhone while using a 3rd party calendar app, you’re not alone! Here are some FAQs to help you troubleshoot the issue and possibly solve it by creating a Google Cloud OAuth project and adjusting permissions.