Small fix for Gzip proto (#341)

Signed-off-by: Kuat Yessenov <kuat@google.com>

api/filter/http/BUILD

@@ -47,3 +47,8 @@ api_proto_library(
         "//api/filter:fault",
     ],
 )
+
+api_proto_library(
+    name = "gzip",
+    srcs = ["gzip.proto"],
+)

api/filter/http/gzip.proto

@@ -4,6 +4,8 @@ syntax = "proto3";
 
 package envoy.api.v2.filter.http;
 
+import "google/protobuf/wrappers.proto";
+
 import "validate/validate.proto";
 
 // Gzip is an HTTP filter which enables Envoy to compress dispatched data from an upstream
@@ -22,10 +24,12 @@ message Gzip {
   // compression. Default value is 30.
   google.protobuf.UInt32Value content_length = 2 [(validate.rules).uint32.gte = 30];
 
-  enum CompressionLevel {
-    DEFAULT = 0;
-    BEST = 1;
-    SPEED = 2;
+  message CompressionLevel {
+    enum Enum {
+      DEFAULT = 0;
+      BEST = 1;
+      SPEED = 2;
+    }
   }
 
   // Allows selecting Zlib's compression level. This setting will affect
@@ -33,7 +37,7 @@ message Gzip {
   // compression at cost of higher latency, "SPEED" provides lower compression with minimum impact
   // on response time. "DEFAULT" provides an optimal result between speed and compression. This
   // field will be set to "DEFAULT" if not specified.
-  CompressionLevel compression_level = 3 [(validate.rules).enum.defined_only = true];
+  CompressionLevel.Enum compression_level = 3 [(validate.rules).enum.defined_only = true];
 
   enum CompressionStrategy {
     DEFAULT = 0;
@@ -61,8 +65,7 @@ message Gzip {
   // Array of strings that allows specifying which mime-types yield compression; e.g.
   // application/json, text/html, etc. When this field is not specified, compression will be applied
   // to any "content-type".
-  repeated string content_type = 6
-      [(validate.rules).repeated = {min_items: 0, max_items: 30, unique: true}];
+  repeated string content_type = 6 [(validate.rules).repeated = {min_items: 0, max_items: 30}];
 
   // Allows disabling compression if response contains "etag" (entity tag)
   // header. Default is false.