How to Circumvent Browser Pop-up Blockers in OAuth Flows?

Combating Browser Pop-up Blockers in OAuth Flows

When implementing OAuth authentication with pure JavaScript, the presentation of the authorization prompt in a pop-up window often faces the challenge of pop-up blockers. To circumvent this hindrance, here's a thorough analysis of the topic.

Understanding Pop-up Blockers

Pop-up blockers are browser features designed to protect users from intrusive or malicious windows appearing without their explicit consent. Browsers employ various criteria to determine whether to block a pop-up, including:

• Direct User Action: Pop-ups triggered by explicit user actions, such as clicking a button, are typically allowed.
• Invocation Depth: Browsers may consider the depth of the call chain that initiated the pop-up. If the window is opened several layers deep, it may be blocked.

Preventing Pop-up Blocking

To avoid pop-up blockers while opening windows for OAuth authentication, it is crucial to ensure:

• Initiation by Direct User Action: When the user clicks a button or link to initiate the OAuth flow, the subsequent pop-up window should not be blocked.
• Shallow Call Chain: Keep the call chain that opens the pop-up window as short as possible. Avoid using complex event listeners or nested recursive functions.
• User Interaction: Engage with the user throughout the flow to mitigate the perception of an automated or intrusive pop-up.

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