Fix backup message job cancel and start bugs.

app/src/main/java/org/thoughtcrime/securesms/jobmanager/impl/BackupMessagesConstraint.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.jobmanager.impl
+
+import android.app.Application
+import android.app.job.JobInfo
+import android.content.Context
+import org.thoughtcrime.securesms.jobmanager.Constraint
+import org.thoughtcrime.securesms.keyvalue.SignalStore
+
+/**
+ * Constraint that, when added, means that a job cannot be performed unless the user either has Wifi or, if they enabled it, cellular
+ */
+class BackupMessagesConstraint(private val application: Application) : Constraint {
+
+  companion object {
+    const val KEY = "BackupMessagesConstraint"
+
+    fun isMet(context: Context): Boolean {
+      if (SignalStore.backup.backupWithCellular) {
+        return NetworkConstraint.isMet(context)
+      }
+      return WifiConstraint.isMet(context)
+    }
+  }
+
+  override fun isMet(): Boolean {
+    return isMet(application)
+  }
+
+  override fun getFactoryKey(): String = KEY
+
+  override fun applyToJobInfo(jobInfoBuilder: JobInfo.Builder) = Unit
+
+  class Factory(val application: Application) : Constraint.Factory<BackupMessagesConstraint> {
+    override fun create(): BackupMessagesConstraint {
+      return BackupMessagesConstraint(application)
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/jobmanager/impl/BackupMessagesConstraintObserver.kt

@@ -0,0 +1,27 @@
+package org.thoughtcrime.securesms.jobmanager.impl
+
+import org.thoughtcrime.securesms.dependencies.AppDependencies
+import org.thoughtcrime.securesms.jobmanager.ConstraintObserver
+
+/**
+ * An observer for the [BackupMessagesConstraint]. This is called when users change whether or not backup is allowed via cellular
+ */
+object BackupMessagesConstraintObserver : ConstraintObserver {
+
+  private const val REASON = "BackupMessagesConstraint"
+
+  private var notifier: ConstraintObserver.Notifier? = null
+
+  override fun register(notifier: ConstraintObserver.Notifier) {
+    this.notifier = notifier
+  }
+
+  /**
+   * Let the observer know that the backup using cellular flag has changed.
+   */
+  fun onChange() {
+    if (BackupMessagesConstraint.isMet(AppDependencies.application)) {
+      notifier?.onConstraintMet(REASON)
+    }
+  }
+}