Using @greymass/return-path library.

package.json

@@ -16,6 +16,7 @@
     "src/*"
   ],
   "dependencies": {
+    "@greymass/return-path": "^0.0.2",
     "tslib": "^2.0.3"
   },
   "peerDependencies": {

src/index.ts

@@ -12,6 +12,8 @@ import {
     SigningRequest,
 } from 'anchor-link'
 
+import { detectReturnPath, isAppleHandheld, isFirefox, isBrave } from "@greymass/return-path";
+
 import styleText from './styles'
 import generateQr from './qrcode'
 
@@ -268,9 +270,9 @@ export default class BrowserTransport implements LinkTransport {
         showFooter = true
     ) {
         const sameDeviceRequest = request.clone()
-        const returnUrl = generateReturnUrl()
+        const returnPath = detectReturnPath()
         sameDeviceRequest.setInfoKey('same_device', true)
-        sameDeviceRequest.setInfoKey('return_path', returnUrl)
+        sameDeviceRequest.setInfoKey('return_path', returnPath)
 
         const sameDeviceUri = sameDeviceRequest.encode(true, false)
         const crossDeviceUri = request.encode(true, false)
@@ -387,7 +389,7 @@ export default class BrowserTransport implements LinkTransport {
         cancel: (reason: string | Error) => void
     ) {
         if (session.metadata.sameDevice) {
-            request.setInfoKey('return_path', generateReturnUrl())
+            request.setInfoKey('return_path', detectReturnPath())
         }
 
         if (session.type === 'fallback') {
@@ -763,97 +765,6 @@ function emptyElement(el: HTMLElement) {
     }
 }
 
-/** Generate a return url that Anchor will redirect back to w/o reload. */
-function generateReturnUrl() {
-    if (isChromeiOS()) {
-        // google chrome on iOS will always open new tab so we just ask it to open again as a workaround
-        return 'googlechrome://'
-    }
-    if (isFirefoxiOS()) {
-        // same for firefox
-        return 'firefox:://'
-    }
-    if (isAppleHandheld() && isBrave()) {
-        // and brave ios
-        return 'brave://'
-    }
-    if (isAppleHandheld()) {
-        // return url with unique fragment required for iOS safari to trigger the return url
-        const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
-        let rv = window.location.href.split('#')[0] + '#'
-        for (let i = 0; i < 8; i++) {
-            rv += alphabet.charAt(Math.floor(Math.random() * alphabet.length))
-        }
-        return rv
-    }
-
-    if (isAndroid() && isFirefox()) {
-        return 'android-intent://org.mozilla.firefox'
-    }
-
-    if (isAndroid() && isEdge()) {
-        return 'android-intent://com.microsoft.emmx'
-    }
-
-    if (isAndroid() && isOpera()) {
-        return 'android-intent://com.opera.browser'
-    }
-
-    if (isAndroid() && isBrave()) {
-        return 'android-intent://com.brave.browser'
-    }
-
-    if (isAndroid() && isAndroidWebView()) {
-        return 'android-intent://webview'
-    }
-
-    if (isAndroid() && isChromeMobile()) {
-        return 'android-intent://com.android.chrome'
-    }
-
-    return window.location.href
-}
-
-function isAppleHandheld() {
-    return /iP(ad|od|hone)/i.test(navigator.userAgent)
-}
-
-function isChromeiOS() {
-    return /CriOS/.test(navigator.userAgent)
-}
-
-function isChromeMobile() {
-    return /Chrome\/[.0-9]* Mobile/i.test(navigator.userAgent)
-}
-
-function isFirefox() {
-    return /Firefox/i.test(navigator.userAgent)
-}
-
-function isFirefoxiOS() {
-    return /FxiOS/.test(navigator.userAgent)
-}
-
-function isOpera() {
-    return /OPR/.test(navigator.userAgent) || /Opera/.test(navigator.userAgent)
-}
-
-function isEdge() {
-    return /Edg/.test(navigator.userAgent)
-}
-
-function isBrave() {
-    return navigator['brave'] && typeof navigator['brave'].isBrave === 'function'
-}
-
-function isAndroid() {
-    return /Android/.test(navigator.userAgent)
-}
-
-function isAndroidWebView() {
-    return /wv/.test(navigator.userAgent) || /Android.*AppleWebKit/.test(navigator.userAgent);
-}
-
 function copyToClipboard(text: string) {
     if (navigator.clipboard && navigator.clipboard.writeText) {
         navigator.clipboard.writeText(text)

test/package.json

@@ -5,6 +5,7 @@
         "build": "snowpack build"
     },
     "dependencies": {
+        "@greymass/return-path": "^0.0.2",
         "@snowpack/plugin-typescript": "^1.1.1",
         "anchor-link": "^3.0.0",
         "snowpack": "3.0.x",

test/yarn.lock

@@ -13,6 +13,13 @@
     hash.js "^1.0.0"
     tslib "^2.0.3"
 
+"@greymass/return-path@^0.0.2":
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/@greymass/return-path/-/return-path-0.0.2.tgz#053ca57eeeea5da970081ef3c818718a7a502f53"
+  integrity sha512-K1/AMGnLi3J3yhOfZPAwU4pxkN12dHt9NiL15fssZ7Kk1vO+m7k3c/T6kR5l8XnfPepeAdVlewRrsBE4gY6QIQ==
+  dependencies:
+    tslib "^2.1.0"
+
 "@snowpack/plugin-typescript@^1.1.1":
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/@snowpack/plugin-typescript/-/plugin-typescript-1.2.1.tgz#7170b039d16d41963cc61a714fe7c37f3fdd9d51"

yarn.lock

@@ -965,6 +965,13 @@
   dependencies:
     tslib "^2.1.0"
 
+"@greymass/return-path@^0.0.2":
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/@greymass/return-path/-/return-path-0.0.2.tgz#053ca57eeeea5da970081ef3c818718a7a502f53"
+  integrity sha512-K1/AMGnLi3J3yhOfZPAwU4pxkN12dHt9NiL15fssZ7Kk1vO+m7k3c/T6kR5l8XnfPepeAdVlewRrsBE4gY6QIQ==
+  dependencies:
+    tslib "^2.1.0"
+
 "@humanwhocodes/config-array@^0.9.2":
   version "0.9.5"
   resolved "https://registry.yarnpkg.com/@humanwhocodes/config-array/-/config-array-0.9.5.tgz#2cbaf9a89460da24b5ca6531b8bbfc23e1df50c7"