Add configuration to ignore unknown headers

Fixes #130.

src/main/java/org/gaul/s3proxy/Main.java

@@ -124,6 +124,8 @@ public final class Main {
                 S3ProxyConstants.PROPERTY_VIRTUAL_HOST);
         String v4MaxNonChunkedRequestSize = properties.getProperty(
                 S3ProxyConstants.PROPERTY_V4_MAX_NON_CHUNKED_REQUEST_SIZE);
+        String ignoreUnknownHeaders = properties.getProperty(
+                S3ProxyConstants.PROPERTY_IGNORE_UNKNOWN_HEADERS);
 
         BlobStore blobStore = createBlobStore(properties);
 
@@ -178,7 +180,11 @@ public final class Main {
             }
             if (v4MaxNonChunkedRequestSize != null) {
                 s3ProxyBuilder.v4MaxNonChunkedRequestSize(Long.parseLong(
-                            v4MaxNonChunkedRequestSize));
+                        v4MaxNonChunkedRequestSize));
+            }
+            if (ignoreUnknownHeaders != null) {
+                s3ProxyBuilder.ignoreUnknownHeaders(Boolean.parseBoolean(
+                        ignoreUnknownHeaders));
             }
             s3Proxy = s3ProxyBuilder.build();
         } catch (IllegalArgumentException | IllegalStateException e) {

src/main/java/org/gaul/s3proxy/S3Proxy.java

@@ -103,7 +103,8 @@ public final class S3Proxy {
         }
         handler = new S3ProxyHandler(builder.blobStore, builder.identity,
                 builder.credential, Optional.fromNullable(builder.virtualHost),
-                builder.v4MaxNonChunkedRequestSize);
+                builder.v4MaxNonChunkedRequestSize,
+                builder.ignoreUnknownHeaders);
         server.setHandler(handler);
     }
 
@@ -117,6 +118,7 @@ public final class S3Proxy {
         private String keyStorePassword;
         private String virtualHost;
         private long v4MaxNonChunkedRequestSize = 32 * 1024 * 1024;
+        private boolean ignoreUnknownHeaders;
 
         Builder() {
         }
@@ -167,6 +169,11 @@ public final class S3Proxy {
             this.v4MaxNonChunkedRequestSize = v4MaxNonChunkedRequestSize;
             return this;
         }
+
+        public Builder ignoreUnknownHeaders(boolean ignoreUnknownHeaders) {
+            this.ignoreUnknownHeaders = ignoreUnknownHeaders;
+            return this;
+        }
     }
 
     public static Builder builder() {

src/main/java/org/gaul/s3proxy/S3ProxyConstants.java

@@ -27,6 +27,8 @@ public final class S3ProxyConstants {
             "s3proxy.identity";
     public static final String PROPERTY_CREDENTIAL =
             "s3proxy.credential";
+    public static final String PROPERTY_IGNORE_UNKNOWN_HEADERS =
+            "s3proxy.ignore-unknown-headers";
     public static final String PROPERTY_KEYSTORE_PATH =
             "s3proxy.keystore-path";
     public static final String PROPERTY_KEYSTORE_PASSWORD =

src/main/java/org/gaul/s3proxy/S3ProxyHandler.java

@@ -187,6 +187,7 @@ final class S3ProxyHandler extends AbstractHandler {
     private final boolean anonymousIdentity;
     private final Optional<String> virtualHost;
     private final long v4MaxNonChunkedRequestSize;
+    private final boolean ignoreUnknownHeaders;
     private final XMLOutputFactory xmlOutputFactory =
             XMLOutputFactory.newInstance();
     private BlobStoreLocator blobStoreLocator;
@@ -206,7 +207,7 @@ final class S3ProxyHandler extends AbstractHandler {
 
     S3ProxyHandler(final BlobStore blobStore, final String identity,
             final String credential, Optional<String> virtualHost,
-            long v4MaxNonChunkedRequestSize) {
+            long v4MaxNonChunkedRequestSize, boolean ignoreUnknownHeaders) {
         if (identity != null) {
             anonymousIdentity = false;
             blobStoreLocator = new BlobStoreLocator() {
@@ -233,6 +234,7 @@ final class S3ProxyHandler extends AbstractHandler {
         }
         this.virtualHost = requireNonNull(virtualHost);
         this.v4MaxNonChunkedRequestSize = v4MaxNonChunkedRequestSize;
+        this.ignoreUnknownHeaders = ignoreUnknownHeaders;
         this.defaultBlobStore = blobStore;
         xmlOutputFactory.setProperty("javax.xml.stream.isRepairingNamespaces",
                 Boolean.FALSE);
@@ -457,6 +459,9 @@ final class S3ProxyHandler extends AbstractHandler {
 
         // emit NotImplemented for unknown x-amz- headers
         for (String headerName : Collections.list(request.getHeaderNames())) {
+            if (ignoreUnknownHeaders) {
+                continue;
+            }
             if (!headerName.startsWith("x-amz-")) {
                 continue;
             }