fingerprintjs

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export const enum ApplePayState {
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  /* Apple Pay is disabled on the user device. Seems like it's never returned on iOS (based on few observations). */
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  Disabled = 0,
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  /** Apple Pay is enabled on the user device */
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  Enabled = 1,
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  /** The browser doesn't have the API to work with Apple Pay */
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  NoAPI = -1,
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  /** Using Apple Pay isn't allowed because the page context isn't secure (not HTTPS) */
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  NotAvailableInInsecureContext = -2,
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  /**
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   * Using Apple Pay isn't allowed because the code runs in a frame,
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   * and the frame origin doesn't match the top level page origin.
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   */
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  NotAvailableInFrame = -3,
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}
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export default function getApplePayState(): ApplePayState {
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  const { ApplePaySession } = window
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  if (typeof ApplePaySession?.canMakePayments !== 'function') {
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    return ApplePayState.NoAPI
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  }
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  try {
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    return ApplePaySession.canMakePayments() ? ApplePayState.Enabled : ApplePayState.Disabled
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  } catch (error) {
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    return getStateFromError(error)
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  }
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}
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/**
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 * The return type is a union instead of the enum, because it's too challenging to embed the const enum into another
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 * project. Turning it into a union is a simple and an elegant solution.
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 *
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 * Warning for package users:
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 * This function is out of Semantic Versioning, i.e. can change unexpectedly. Usage is at your own risk.
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 */
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export function getStateFromError(error: unknown): -2 | -3 {
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  if (error instanceof Error) {
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    // See full expected error messages in the test
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    if (error.name === 'InvalidAccessError') {
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      if (/\bfrom\b.*\binsecure\b/i.test(error.message)) {
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        return ApplePayState.NotAvailableInInsecureContext
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      }
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      if (/\bdifferent\b.*\borigin\b.*top.level\b.*\bframe\b/i.test(error.message)) {
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        return ApplePayState.NotAvailableInFrame
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      }
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    }
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    if (error.name === 'SecurityError') {
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      if (/\bthird.party iframes?.*\bnot.allowed\b/i.test(error.message)) {
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        return ApplePayState.NotAvailableInFrame
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      }
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    }
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  }
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  throw error
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}
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