updated logging and minor code change

Author: Synapticloop

src/main/java/synapticloop/b2/request/BaseB2Request.java

@@ -358,6 +358,8 @@ private void setHeaders(Logger LOGGER, HttpRequestBase httpRequestBase) {
 			if(!httpRequestBase.containsHeader(headerKey)) {
 				LOGGER.trace("Setting header (encoded) '{}'.", headerKey);
 				httpRequestBase.setHeader(headerKey, Helper.urlEncode(headers.get(headerKey)));
+			} else {
+				LOGGER.warn("Attempting to set header (encoded) '{}', which already exists, ignoring...", headerKey);
 			}
 		}
 
@@ -366,6 +368,8 @@ private void setHeaders(Logger LOGGER, HttpRequestBase httpRequestBase) {
 			if(!httpRequestBase.containsHeader(headerKey)) {
 				LOGGER.trace("Setting header (un-encoded) '{}'.", headerKey);
 				httpRequestBase.setHeader(headerKey, unencodedHeaders.get(headerKey));
+			} else {
+				LOGGER.warn("Attempting to set header (un-encoded) '{}', which already exists, ignoring...", headerKey);
 			}
 		}
 	}

src/main/java/synapticloop/b2/util/Helper.java

@@ -14,6 +14,7 @@
 import synapticloop.b2.exception.B2ApiException;
 
 public class Helper {
+	private static final String SHA_1 = "SHA-1";
 	private static final String UTF_8 = "UTF-8";
 
 	/**
@@ -32,7 +33,7 @@ public static String calculateSha1(File file) throws B2ApiException {
 		MessageDigest messageDigest = null;
 		InputStream inputStream = null;
 		try {
-			messageDigest = MessageDigest.getInstance("SHA-1");
+			messageDigest = MessageDigest.getInstance(SHA_1);
 			inputStream = new BufferedInputStream(new FileInputStream(file));
 			byte[] buffer = new byte[8192];
 			int len = inputStream.read(buffer);