QRCode Auth: Support WP.com Login

[zwarm]

This is the main project issue for supporting WordPress.com login by QR Code
Additional project information available here.

• QRCode Auth: Add feature flag for qrcode auth flow #16533
• QRCode Auth: Add enable flag #16601
• Networking FluxC PR
  • Create QrcodeRestClient and QrcodeStore
  • Implement request to validate data that was provided in the QR Code
  • Implement post to server to auth the user in the browser
  • Write unit tests

Implement Auth flow

• QRCode Auth: Create skeleton activity, fragment, vm, test #16605
• QR Code Auth: Part 1 - Launching the flow #16706
• QR Code Auth: Part 2 - Layouts, styles, strings, and illustrations #16707
• QR Code Auth: Part 3 - UiState introduction #16708
• QR Code Auth: Part 4 - Action/events channel for onbackpressed dismiss dialog #16709
• QR Code Auth: Part 5 - Implement Scanner #16710
• QR Code Auth: Part 6 - Save/Restore state and render UI #16711
• QR Code Auth: Part 7 - Implement FluxC Validate and Authenticate calls #16713
• QRCode Auth: Add tracking events #16714
• QRCode Auth: Additional track events #16783

Implement Scanning of QR Code into Auth Flow

• QRCode Auth: Add scan login code to Me view #16595
• Research qrcode scanning library - In Progress See paqN3M-zI-p2 for more info
• QR Code Auth: Part 5 - Implement Scanner #16710

Implement Deep Linking

• QRCode Auth: Launch flow by deep link #16770
• Add new folder for apps domain and hidden .well-known directory under it for assetlinks.json. This has to be deployed before any testing can be begin
  Note: Thank about strategy for maintaining state when a deep link occurs and the app was already open OR if it's needed at all.

Support in Jetpack Only

• QRCode Auth: Enable for Jetpack Only #16771 Update build.gradle to turn off the feature in WordPress
• QRCode Auth: Enable for Jetpack Only #16771 Set up remote config field for turning off feature if Beta scanner go awry
• QRCode Auth: Add Jetpack AndroidManifest  #16797

Bugs

• QR Code Auth: Restoring state is wonky #16738
• QR Code Auth: Adjust origin tracking  #16775

Post Implementation - not required for launch
Remove viewModelScope.launch in postUiState - needs testing to ensure updates are not missed
Remove the 'invalid-data` check in FluxC, as the error comes back as a 401 and not a 400

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Deployment Preparation

• Create Remote Feature Flag as qrcode_auth_flow_remote_field
• QR Code Auth: Prep for release #16798 Enable Feature and Remote flags (see QRCode Auth: Enable for Jetpack Only #16771)
• QR Code Auth: Prep for release #16798 Add release notes
• Make sure connected tests pass

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Future

• Enable feature announcement in MC Tool
• Remove feature flag

[zwarm]

Feature is releasing with 20.2 and is guarded with a Firebase remote config flag.