Adding a verification to only appear the prompt on Safari

[juancarlosjr97]

Currently, the prompt appears on all the browser using iOS or iPad. The changes made check if the browser is Safari to show the prompt or not.

[PegasisForever]

See https://chromium.googlesource.com/chromium/src/+/master/docs/ios/user_agent.md and https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox#firefox_for_ios
We probably can improve this by explicitly detecting firefox and chrome on ios.

[juancarlosjr97]

Do you mean to confirm is Safari, not Google Chrome or Firefox @PegasisForever ?

[PegasisForever]

Yes, if we found FxiOS or CriOS in the ua, we are 100% sure it's not safari

[juancarlosjr97]

@PegasisForever apparently is an issue mozilla-mobile/firefox-ios#6620 any thoughts?

[martinbroos]

If only Safari has support for 'add to homescreen' than this pr seems right to me. If you are gonna detect firefox and chrome on iOS than there are probably more browsers that can be installed on iOS. Not sure if chrome and firefox on iOS support native PWA detection ?

But still this pull request seems the best step forward to me.

[juancarlosjr97]

If only Safari has support for 'add to homescreen'

Yes @martinbroos, the only browser on iOS that allows adding to the home screen a PWA is Safari.