Put info about data saver in the logs.

app/src/main/java/org/thoughtcrime/securesms/logsubmit/LogSectionSystemInfo.java

@@ -70,10 +70,11 @@ public class LogSectionSystemInfo implements LogSection {
     builder.append("Device ID     : ").append(SignalStore.account().getDeviceId()).append("\n");
     builder.append("Censored      : ").append(ApplicationDependencies.getSignalServiceNetworkAccess().isCensored()).append("\n");
     builder.append("Network Status: ").append(NetworkUtil.getNetworkStatus(context)).append("\n");
+    builder.append("Data Saver    : ").append(DeviceProperties.getDataSaverState(context)).append("\n");
     builder.append("Play Services : ").append(getPlayServicesString(context)).append("\n");
     builder.append("FCM           : ").append(SignalStore.account().isFcmEnabled()).append("\n");
     builder.append("BkgRestricted : ").append(Build.VERSION.SDK_INT >= 28 ? DeviceProperties.isBackgroundRestricted(context) : "N/A").append("\n");
-    builder.append("Locale        : ").append(Locale.getDefault().toString()).append("\n");
+    builder.append("Locale        : ").append(Locale.getDefault()).append("\n");
     builder.append("Linked Devices: ").append(TextSecurePreferences.isMultiDevice(context)).append("\n");
     builder.append("First Version : ").append(TextSecurePreferences.getFirstInstallVersion(context)).append("\n");
     builder.append("Days Installed: ").append(VersionTracker.getDaysSinceFirstInstalled(context)).append("\n");

app/src/main/java/org/thoughtcrime/securesms/util/DeviceProperties.java

@@ -3,6 +3,7 @@ package org.thoughtcrime.securesms.util;
 import android.app.ActivityManager;
 import android.app.ActivityManager.MemoryInfo;
 import android.content.Context;
+import android.net.ConnectivityManager;
 import android.os.Build;
 
 import androidx.annotation.NonNull;
@@ -55,4 +56,51 @@ public final class DeviceProperties {
     ActivityManager activityManager = ServiceUtil.getActivityManager(context);
     return activityManager.isBackgroundRestricted();
   }
+
+  public static DataSaverState getDataSaverState(@NonNull Context context) {
+    if (Build.VERSION.SDK_INT >= 24) {
+      switch (ServiceUtil.getConnectivityManager(context).getRestrictBackgroundStatus()) {
+        case ConnectivityManager.RESTRICT_BACKGROUND_STATUS_ENABLED:
+          return DataSaverState.ENABLED;
+        case ConnectivityManager.RESTRICT_BACKGROUND_STATUS_WHITELISTED:
+          return DataSaverState.ENABLED_BUT_EXEMPTED;
+        case ConnectivityManager.RESTRICT_BACKGROUND_STATUS_DISABLED:
+          return DataSaverState.DISABLED;
+      }
+    }
+
+    return DataSaverState.DISABLED;
+  }
+
+  public enum DataSaverState {
+    /** Data saver is enabled system-wide, and we are subject to the restrictions. */
+    ENABLED(true, true),
+
+    /** Data saver is enabled system-wide, but the user has exempted us by giving us 'unrestricted access' to data in the system settings */
+    ENABLED_BUT_EXEMPTED(true, false),
+
+    /** Data saver is disabled. */
+    DISABLED(false, false);
+
+    private final boolean enabled;
+    private final boolean restricted;
+
+    DataSaverState(boolean enabled, boolean restricted) {
+      this.enabled    = enabled;
+      this.restricted = restricted;
+    }
+
+    /** True if the device has data saver enabled, otherwise false. */
+    public boolean isEnabled() {
+      return enabled;
+    }
+
+    /**
+     * True if we're subject to data saver restrictions, otherwise false.
+     * Even if data saver is enabled device-wide, this could still be false if the user has given us 'unrestricted access' to data in the system settings.
+     */
+    public boolean isRestricted() {
+      return restricted;
+    }
+  }
 }