140 lines
9.5 KiB
Markdown
140 lines
9.5 KiB
Markdown
# PWA
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Elk provides a PWA (Progressive Web App) that can be installed on your desktop/device. This allows you to use Elk as a native app on your device, and it will work offline.
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The main goal of the PWA is to provide a native app experience on mobile devices with Web Push Notifications and Web Share Target API capabilities.
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Web Share Target will allow you to share content from other apps to Elk in mobile browsers.
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## Mobile Support
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Some mobile browsers will allow you to install the PWA as a native app, and some others will only allow you to add the PWA to your home screen.
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If you're using a mobile browser that supports the PWA installation, you will see a banner at the bottom of the screen with the option to install the PWA.
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If the browser also supports [beforeinstallprompt](https://web.dev/customize-install/) event, ElK will show a prompt (on the right aside on wide screens, or at top on small screens) to allow you to install the PWA directly.
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If the browser doesn't support the PWA installation, check following entries:
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### Safari iOS
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Right now, you cannot use Web Push Notifications on Safari mobile browsers, since it doesn't support the Web Push API yet at operating system level.
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You can check the status of the Push API on Safari mobile browsers on [this page](https://caniuse.com/notifications).
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Visit also [this site](https://firt.dev/notes/pwa-ios/) to check the status of PWA Capabilities on Safari mobile browsers.
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To install a Progressive Web App (PWA) on Safari, follow these steps:
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- Tap the "Share" icon at the bottom of the screen.
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- Scroll down and tap "Add to Home Screen".
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- Customize the name of the app (if desired) and tap "Add".
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- The PWA should now appear on your home screen.
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### Other borwsers on iOS
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Browsers on iOS other than Safari (like Chrome) are very limited on PWA functionalities. Besides Web Push Notifications (like in Safari) not even PWA installation is supported.
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If you are using one of these browsers and want to add Elk to your homescreen, you will have to use Safari and follow the instructions above.
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### Firefox
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To install a Progressive Web App (PWA) on Firefox, follow these steps:
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- Look for the install button or icon, usually located in the address bar or in a prompt that appears on the screen.
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- Click on the install button or icon and follow the prompts to complete the installation.
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- If you don't see an install button or icon, you can look for the PWA in the Firefox menu. Click on the three horizontal lines in the top/bottom right corner of the browser window to open the menu, then click on "Install" option.
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### Chromium based browsers
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To install a Progressive Web App (PWA) on Chromium based browsers, such as Google Chrome, Microsoft Edge, or Brave, follow these steps:
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- Click on the menu button (three vertical dots) at the top right corner of the screen.
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- Select "Install Elk as app" or "Install Elk to Home screen".
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- Customize the name of the app (if desired) and click "Install" or "Add".
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- The PWA should now appear on your device's home screen or in your app drawer.
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## PWA Configuration in Elk project
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By default, Elk will enable the PWA integration, but can be disabled by setting `VITE_DEV_PWA` to `false` in your `.env` file.
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You can find the configuration options for the PWA in the [config/pwa.ts](https://github.com/elk-zone/elk/blob/main/config/pwa.ts) module.
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### PWA Web Manifest
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Right now, there is no support for web manifest internationalization and theme color in any browser, we're using a custom module to generate web manifests for theme color and language variants.
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Elk will generate 2 web manifests per locale, one for light theme and one for dark theme.
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You can check web manifest generation on [modules/pwa/i18n.ts](https://github.com/elk-zone/elk/blob/main/modules/pwa/i18n.ts) module.
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### PWA UI Components
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Elk will provide a set of UI components to allow you to customize the PWA installation prompt on browsers with [beforeinstallprompt](https://web.dev/customize-install/) support.
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You can find the PWA installation prompt in the [PwaInstallPrompt](https://github.com/elk-zone/elk/blob/main/components/pwa/PwaInstallPrompt.client.vue) component: will be shown on the right aside on wide screens, or at top on small screens.
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Elk is using prompt for update strategy, so the PWA prompt for update will be shown only if there is a new version of Elk available.
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On small screens, the PWA prompt for update will be shown as a button on the head, you can find it in [PwaBadge](https://github.com/elk-zone/elk/blob/main/components/pwa/PwaBadge.client.vue) component.
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On wide screens, the PWA prompt for update will be shown as a prompt on the right aside, you can find it in [PwaPrompt](https://github.com/elk-zone/elk/blob/main/components/pwa/PwaPrompt.client.vue) component.
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PWA prompt for update will take preference over PWA installation prompt, so if there is a new version of Elk available, the PWA prompt for update will be shown instead of the PWA installation prompt.
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All previous UI components don't have any logic, all them will use the logic provided by the [PWA plugin](https://github.com/elk-zone/elk/blob/main/plugins/pwa.client.ts).
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### Service Worker
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You can find Elk custom service worker in [service-worker folder](https://github.com/elk-zone/elk/blob/main/service-worker), it provides:
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- [Prompt for update strategy](https://github.com/elk-zone/elk/blob/main/service-worker/sw.ts#L14).
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- [Web Push Notifications](https://github.com/elk-zone/elk/blob/main/service-worker/web-push-notifications.ts): [push notifications](https://github.com/elk-zone/elk/blob/main/service-worker/sw.ts#L105) and [push notification click](https://github.com/elk-zone/elk/blob/main/service-worker/sw.ts#L106).
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- [Web Share Target API](https://github.com/elk-zone/elk/blob/main/service-worker/share-target.ts): [share target registration](https://github.com/elk-zone/elk/blob/main/service-worker/sw.ts#L107).
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### Push Notifications Subscription Logic
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Elk will allow you to send push notifications to your users, you can find the logic for Web Push Notifications subscription [composables/push-notifications folder](https://github.com/elk-zone/elk/blob/main/composables/push-notifications).
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There is a limitation on browsers about registering multiple Web Push Notifications: you can only subscribe to one push service per browser per application: trying to register multiple push subscriptions will be treated as spam by the browser.
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If you try to register multiple push subscriptions, the browser will throw an error, and you will need to unregister the previous push subscription before registering a new one.
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### Debugging PWA in development
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To debug the PWA in development, you will need to run `dev:pwa` or `dev:mocked:pwa` script.
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Running one of previous scripts will start a development server with the PWA enabled: you can review the web manifests and debug the service worker in your browser, use any Chromium based browser, since we're registering the service worker using `type: 'module'`.
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You can debug Web Push Notifications in desktop and mobile browser and Web Share Target in your mobile device, using the same URL as the development server.
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Right now, we can only debug on Android Chrome mobile browsers:
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- Web Push Notifications: you don't need to install de PWA, just enable the notifications in the browser on notifications page or web push notifications settings page.
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- Web Share Target: you need to install the PWA, and then you can share content from other apps to Elk.
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### Debugging PWA in mobile browsers
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To debug the PWA service worker in your mobile browser, you will need to:
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1) Enable development options in your Android device:
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- Go to "Settings" on your device.
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- Scroll down to "About phone" and tap it.
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- Locate the "Build number" and tap it repeatedly (usually 7 times) until you see a message saying that you have enabled developer options.
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- Go back to "Settings" and you should now see "Developer options" listed.
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- Tap on "Developer options" and you can enable various settings such as USB debugging, mock locations, and more.
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2) Connect your Android device to your computer using a USB cable.
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3) Enable USB debugging in your Android device:
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- Go to "Settings" on your device.
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- Scroll down to "Developer options" and tap it.
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- Enable "USB debugging".
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- Confirm the prompt on your device to allow USB debugging.
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- Open Chrome/Edge browser in your device.
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4) Open Chrome on your computer and go to `chrome://inspect/#devices`.
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- Your device should be listed in the "Remote Target" section after a few seconds (if not, open Chrome/Edge and navigate to any page).
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- Click the "Port forwarding..." button and type "5314" into the "Port" input and "localhost:5314" into the "IP address and port" input, then press "Done".
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- Enter `http://localhost:5314` in the "Open tab with url" input and click the "Open" button.
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- Click on the "Inspect" button to open the DevTools.
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5) Remember to remove the service worker from your device browser using dev tools once you finish testing the service worker:
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- Go to `Application > Storage`, you should check following checkboxes:
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- Application: `[x]` Unregister service worker
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- Storage: `[x]` Local and session storage `[x]` IndexedDB
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- Cache: `[x]` Cache storage and `[x]` Application cache
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- Click on Clear site data button
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- Go to `Application > Service Workers` and check the current service worker is missing or has the status deleted or reduntant.
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6) Disable port forwarding: open the "Port forwarding..." modal again on the `chrome://inspect/#devices` page and either uncheck the "Enable port forwarding" option or remove the entry from the list and click "Done".
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