React Native Url Resolver

This is an expo module which will resolve a url to its final destination. It is useful for resolving tracking links (ie. Sendgrid https://www.twilio.com/docs/sendgrid/ui/sending-email/universal-links#using-java)

Installation

1. Install npm install rn-url-resolver
2. If deep linking is necessary, host the correct aasa for the subdomain and add the correct associated domains & intent filters ie. tracking-link.example.com to your app.json

For iOS

"associatedDomains": ["applinks:tracking-link.example.com"]

For Android

"intentFilters": [
    {
      "action": "VIEW",
      "autoVerify": true,
      "category": ["BROWSABLE", "DEFAULT"],
      "data": [
        {
          "scheme": "https", // or "http"
          "host": "tracking-link.example.com",
          "pathPrefix": "/"
        }
      ]
    }
  ]

3. Run expo prebuild npx expo prebuild.

Usage

import RnUrlResolver from "rn-url-resolver";

• Resolve the url

const url = "https://tracking-link.example.com/ls/click?123456";
const token: string | undefined = 'example-token';
const resolvedUrl = await RnUrlResolver.resolveUrl({ url, token, allowReturnFromFailedUrl: boolean });

The token parameter is optional and defaults to undefined. The allowReturnFromFailedUrl parameter is optional and defaults to false. Only for iOS. If set to true, the url will be returned even when there is an NSErrorFailingURLStringKey. Note: You may need to specify some info.plist settings for this setting to actually work. Here's an example config for expo:

ios: {
  infoPlist: {
        NSAppTransportSecurity: {
          NSAllowsArbitraryLoads: false,
          NSExceptionDomains:[
            ['example.com']: {
              NSExceptionAllowsInsecureHTTPLoads: true,
              NSIncludesSubdomains: false,
            },
          ],
        }
  },
}