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

@@ -0,0 +1,49 @@
+package org.thoughtcrime.securesms.util;
+
+import androidx.annotation.NonNull;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.Charset;
+import java.util.Objects;
+
+import okhttp3.MediaType;
+import okhttp3.ResponseBody;
+
+import static okhttp3.internal.Util.UTF_8;
+
+public final class OkHttpUtil {
+
+  private OkHttpUtil() {}
+
+  public static byte[] readAsBytes(@NonNull InputStream bodyStream, long sizeLimit) throws IOException {
+    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+
+    byte[] buffer      = new byte[(int) ByteUnit.KILOBYTES.toBytes(32)];
+    int    readLength  = 0;
+    int    totalLength = 0;
+
+    while ((readLength = bodyStream.read(buffer)) >= 0) {
+      if (totalLength + readLength > sizeLimit) {
+        throw new IOException("Exceeded maximum size during read!");
+      }
+
+      outputStream.write(buffer, 0, readLength);
+      totalLength += readLength;
+    }
+
+    return outputStream.toByteArray();
+  }
+  public static String readAsString(@NonNull ResponseBody body, long sizeLimit) throws IOException {
+    if (body.contentLength() > sizeLimit) {
+      throw new IOException("Content-Length exceeded maximum size!");
+    }
+
+    byte[]    data        = readAsBytes(body.byteStream(), sizeLimit);
+    MediaType contentType = body.contentType();
+    Charset   charset     = contentType != null ? contentType.charset(UTF_8) : UTF_8;
+
+    return new String(data, Objects.requireNonNull(charset));
+  }
+}

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

@@ -159,6 +159,10 @@ public class Util {
     return collection == null || collection.isEmpty();
   }
 
+  public static boolean isEmpty(@Nullable String value) {
+    return value == null || value.length() == 0;
+  }
+
   public static boolean hasItems(@Nullable Collection<?> collection) {
     return collection != null && !collection.isEmpty();
   }
@@ -169,7 +173,7 @@ public class Util {
 
   public static String getFirstNonEmpty(String... values) {
     for (String value : values) {
-      if (!TextUtils.isEmpty(value)) {
+      if (!Util.isEmpty(value)) {
         return value;
       }
     }