113 lines
3.7 KiB
Go
113 lines
3.7 KiB
Go
package android
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import (
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"fmt"
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"sync"
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"gioui.org/app"
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"github.com/tailscale/tailscale-android/jni"
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)
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const (
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helperClass = "ht/sr/git/whereswaldon/niotify/NotificationHelper"
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)
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var (
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idlock sync.Mutex
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nextNotificationID int32
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)
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func nextID() int32 {
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idlock.Lock()
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defer idlock.Unlock()
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id := nextNotificationID
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nextNotificationID++
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return id
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}
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// NotificationChannel represents a stream of notifications that an application
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// provisions on android. Such streams can be selectively enabled and disabled
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// by the user, and should be used for different purposes.
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type NotificationChannel struct {
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id string
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}
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// NewChannel creates a new notification channel identified by the provided id
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// and with the given user-visible name and description.
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func NewChannel(id, name, description string) (*NotificationChannel, error) {
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if err := jni.Do(jni.JVMFor(app.JavaVM()), func(env jni.Env) error {
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appCtx := jni.Object(app.AppContext())
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classLoader := jni.ClassLoaderFor(env, appCtx)
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notifyClass, err := jni.LoadClass(env, classLoader, helperClass)
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if err != nil {
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return err
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}
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newChannelMethod := jni.GetStaticMethodID(env, notifyClass, "newChannel", "(Landroid/content/Context;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V")
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jname := jni.Value(jni.JavaString(env, name))
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jdescription := jni.Value(jni.JavaString(env, description))
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jID := jni.Value(jni.JavaString(env, id))
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err = jni.CallStaticVoidMethod(env, notifyClass, newChannelMethod, jni.Value(app.AppContext()), jID, jname, jdescription)
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if err != nil {
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return err
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}
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return nil
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}); err != nil {
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return nil, fmt.Errorf("failed creating notification channel: %w", err)
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}
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nc := &NotificationChannel{
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id: id,
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}
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return nc, nil
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}
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// Notification represents a notification that has been requested to be shown to the user.
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// This type provides methods to cancel or update the contents of the notification.
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type Notification struct {
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id int32
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}
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// Send creates a new Notification and requests that it be displayed on this channel.
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func (nc *NotificationChannel) Send(title, text string) (*Notification, error) {
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notificationID := nextID()
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if err := jni.Do(jni.JVMFor(app.JavaVM()), func(env jni.Env) error {
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appCtx := jni.Object(app.AppContext())
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classLoader := jni.ClassLoaderFor(env, appCtx)
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notifyClass, err := jni.LoadClass(env, classLoader, helperClass)
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if err != nil {
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return err
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}
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newChannelMethod := jni.GetStaticMethodID(env, notifyClass, "sendNotification", "(Landroid/content/Context;Ljava/lang/String;ILjava/lang/String;Ljava/lang/String;)V")
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jtitle := jni.Value(jni.JavaString(env, title))
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jtext := jni.Value(jni.JavaString(env, text))
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jID := jni.Value(jni.JavaString(env, nc.id))
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err = jni.CallStaticVoidMethod(env, notifyClass, newChannelMethod, jni.Value(app.AppContext()), jID, jni.Value(notificationID), jtitle, jtext)
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if err != nil {
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return err
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}
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return nil
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}); err != nil {
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return nil, fmt.Errorf("failed sending notification: %w", err)
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}
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return &Notification{
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id: notificationID,
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}, nil
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}
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// Cancel removes a previously created notification from display.
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func (n *Notification) Cancel() error {
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notificationID := n.id
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if err := jni.Do(jni.JVMFor(app.JavaVM()), func(env jni.Env) error {
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appCtx := jni.Object(app.AppContext())
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classLoader := jni.ClassLoaderFor(env, appCtx)
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notifyClass, err := jni.LoadClass(env, classLoader, helperClass)
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if err != nil {
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return err
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}
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newChannelMethod := jni.GetStaticMethodID(env, notifyClass, "cancelNotification", "(Landroid/content/Context;I)V")
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return jni.CallStaticVoidMethod(env, notifyClass, newChannelMethod, jni.Value(app.AppContext()), jni.Value(notificationID))
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}); err != nil {
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return fmt.Errorf("failed cancelling notification: %w", err)
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}
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return nil
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}
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