Add support for OTA emoji download.

app/src/main/java/org/thoughtcrime/securesms/jobmanager/impl/AutoDownloadEmojiConstraint.java

@@ -0,0 +1,80 @@
+package org.thoughtcrime.securesms.jobmanager.impl;
+
+import android.app.job.JobInfo;
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
+
+import org.thoughtcrime.securesms.jobmanager.Constraint;
+import org.thoughtcrime.securesms.util.NetworkUtil;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
+
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * Constraint for Emoji Downloads which respects users settings regarding image downloads and requires network.
+ */
+public class AutoDownloadEmojiConstraint implements Constraint {
+
+  public static final String KEY = "AutoDownloadEmojiConstraint";
+
+  private static final String IMAGE_TYPE = "images";
+
+  private final Context context;
+
+  private AutoDownloadEmojiConstraint(@NonNull Context context) {
+    this.context = context.getApplicationContext();
+  }
+
+  @Override
+  public boolean isMet() {
+    return canAutoDownloadEmoji(context);
+  }
+
+  @Override
+  public @NonNull String getFactoryKey() {
+    return KEY;
+  }
+
+  @RequiresApi(26)
+  @Override
+  public void applyToJobInfo(@NonNull JobInfo.Builder jobInfoBuilder) {
+    boolean canDownloadWhileRoaming = TextSecurePreferences.getRoamingMediaDownloadAllowed(context).contains(IMAGE_TYPE);
+    boolean canDownloadWhileMobile  = TextSecurePreferences.getMobileMediaDownloadAllowed(context).contains(IMAGE_TYPE);
+
+    if (canDownloadWhileRoaming) {
+      jobInfoBuilder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY);
+    } else if (canDownloadWhileMobile) {
+      jobInfoBuilder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_NOT_ROAMING);
+    } else {
+      jobInfoBuilder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED);
+    }
+  }
+
+  public static boolean canAutoDownloadEmoji(@NonNull Context context) {
+    return getAllowedAutoDownloadTypes(context).contains(IMAGE_TYPE);
+  }
+
+  private static @NonNull Set<String> getAllowedAutoDownloadTypes(@NonNull Context context) {
+    if      (NetworkUtil.isConnectedWifi(context))    return Collections.singleton(IMAGE_TYPE);
+    else if (NetworkUtil.isConnectedRoaming(context)) return TextSecurePreferences.getRoamingMediaDownloadAllowed(context);
+    else if (NetworkUtil.isConnectedMobile(context))  return TextSecurePreferences.getMobileMediaDownloadAllowed(context);
+    else                                              return Collections.emptySet();
+  }
+
+  public static final class Factory implements Constraint.Factory<AutoDownloadEmojiConstraint> {
+
+    private final Context context;
+
+    public Factory(@NonNull Context context) {
+      this.context = context.getApplicationContext();
+    }
+
+    @Override
+    public AutoDownloadEmojiConstraint create() {
+      return new AutoDownloadEmojiConstraint(context);
+    }
+  }
+}