filters: add generic compressor filter

CODEOWNERS

@@ -18,6 +18,8 @@ extensions/filters/common/original_src @snowp @klarose
 /*/extensions/filters/network/dubbo_proxy @zyfjeff @lizan
 # thrift_proxy extension
 /*/extensions/filters/network/thrift_proxy @zuercher @brian-pane
+# compressor used by http compression filters
+/*/extensions/filters/http/common/compressor @gsagula @rojkov @dio
 # jwt_authn http filter extension
 /*/extensions/filters/http/jwt_authn @qiwzhang @lizan
 # grpc_http1_reverse_bridge http filter extension

api/BUILD

@@ -31,6 +31,7 @@ proto_library(
         "//envoy/config/filter/http/aws_request_signing/v2alpha:pkg",
         "//envoy/config/filter/http/buffer/v2:pkg",
         "//envoy/config/filter/http/cache/v2alpha:pkg",
+        "//envoy/config/filter/http/compressor/v2:pkg",
         "//envoy/config/filter/http/cors/v2:pkg",
         "//envoy/config/filter/http/csrf/v2:pkg",
         "//envoy/config/filter/http/dynamic_forward_proxy/v2alpha:pkg",
@@ -161,6 +162,7 @@ proto_library(
         "//envoy/extensions/filters/http/aws_request_signing/v3:pkg",
         "//envoy/extensions/filters/http/buffer/v3:pkg",
         "//envoy/extensions/filters/http/cache/v3alpha:pkg",
+        "//envoy/extensions/filters/http/compressor/v3:pkg",
         "//envoy/extensions/filters/http/cors/v3:pkg",
         "//envoy/extensions/filters/http/csrf/v3:pkg",
         "//envoy/extensions/filters/http/dynamic_forward_proxy/v3:pkg",

api/docs/BUILD

@@ -37,6 +37,7 @@ proto_library(
         "//envoy/config/filter/http/aws_request_signing/v2alpha:pkg",
         "//envoy/config/filter/http/buffer/v2:pkg",
         "//envoy/config/filter/http/cache/v2alpha:pkg",
+        "//envoy/config/filter/http/compressor/v2:pkg",
         "//envoy/config/filter/http/cors/v2:pkg",
         "//envoy/config/filter/http/csrf/v2:pkg",
         "//envoy/config/filter/http/dynamic_forward_proxy/v2alpha:pkg",

api/envoy/config/filter/http/compressor/v2/BUILD

@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/api/v2/core:pkg",
+        "@com_github_cncf_udpa//udpa/annotations:pkg",
+    ],
+)

api/envoy/config/filter/http/compressor/v2/compressor.proto

@@ -0,0 +1,46 @@
+syntax = "proto3";
+
+package envoy.config.filter.http.compressor.v2;
+
+import "envoy/api/v2/core/base.proto";
+
+import "google/protobuf/wrappers.proto";
+
+import "udpa/annotations/migrate.proto";
+
+option java_package = "io.envoyproxy.envoy.config.filter.http.compressor.v2";
+option java_outer_classname = "CompressorProto";
+option java_multiple_files = true;
+option (udpa.annotations.file_migrate).move_to_package =
+    "envoy.extensions.filters.http.compressor.v3";
+
+// [#protodoc-title: Compressor]
+
+// [#next-free-field: 6]
+message Compressor {
+  // Minimum response length, in bytes, which will trigger compression. The default value is 30.
+  google.protobuf.UInt32Value content_length = 1;
+
+  // Set of strings that allows specifying which mime-types yield compression; e.g.,
+  // application/json, text/html, etc. When this field is not defined, compression will be applied
+  // to the following mime-types: "application/javascript", "application/json",
+  // "application/xhtml+xml", "image/svg+xml", "text/css", "text/html", "text/plain", "text/xml"
+  // and their synonyms.
+  repeated string content_type = 2;
+
+  // If true, disables compression when the response contains an etag header. When it is false, the
+  // filter will preserve weak etags and remove the ones that require strong validation.
+  bool disable_on_etag_header = 3;
+
+  // If true, removes accept-encoding from the request headers before dispatching it to the upstream
+  // so that responses do not get compressed before reaching the filter.
+  // .. attention:
+  //
+  //    To avoid interfering with other compression filters in the same chain use this option in
+  //    the filter closest to the upstream.
+  bool remove_accept_encoding_header = 4;
+
+  // Runtime flag that controls whether the filter is enabled or not. If set to false, the
+  // filter will operate as a pass-through filter. If not specified, defaults to enabled.
+  api.v2.core.RuntimeFeatureFlag runtime_enabled = 5;
+}

api/envoy/extensions/filters/http/compressor/v3/BUILD

@@ -0,0 +1,13 @@
+# DO NOT EDIT. This file is generated by tools/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/config/core/v3:pkg",
+        "//envoy/config/filter/http/compressor/v2:pkg",
+        "@com_github_cncf_udpa//udpa/annotations:pkg",
+    ],
+)

api/envoy/extensions/filters/http/compressor/v3/compressor.proto

@@ -0,0 +1,47 @@
+syntax = "proto3";
+
+package envoy.extensions.filters.http.compressor.v3;
+
+import "envoy/config/core/v3/base.proto";
+
+import "google/protobuf/wrappers.proto";
+
+import "udpa/annotations/versioning.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.filters.http.compressor.v3";
+option java_outer_classname = "CompressorProto";
+option java_multiple_files = true;
+
+// [#protodoc-title: Compressor]
+
+// [#next-free-field: 6]
+message Compressor {
+  option (udpa.annotations.versioning).previous_message_type =
+      "envoy.config.filter.http.compressor.v2.Compressor";
+
+  // Minimum response length, in bytes, which will trigger compression. The default value is 30.
+  google.protobuf.UInt32Value content_length = 1;
+
+  // Set of strings that allows specifying which mime-types yield compression; e.g.,
+  // application/json, text/html, etc. When this field is not defined, compression will be applied
+  // to the following mime-types: "application/javascript", "application/json",
+  // "application/xhtml+xml", "image/svg+xml", "text/css", "text/html", "text/plain", "text/xml"
+  // and their synonyms.
+  repeated string content_type = 2;
+
+  // If true, disables compression when the response contains an etag header. When it is false, the
+  // filter will preserve weak etags and remove the ones that require strong validation.
+  bool disable_on_etag_header = 3;
+
+  // If true, removes accept-encoding from the request headers before dispatching it to the upstream
+  // so that responses do not get compressed before reaching the filter.
+  // .. attention:
+  //
+  //    To avoid interfering with other compression filters in the same chain use this option in
+  //    the filter closest to the upstream.
+  bool remove_accept_encoding_header = 4;
+
+  // Runtime flag that controls whether the filter is enabled or not. If set to false, the
+  // filter will operate as a pass-through filter. If not specified, defaults to enabled.
+  config.core.v3.RuntimeFeatureFlag runtime_enabled = 5;
+}

generated_api_shadow/BUILD

@@ -35,6 +35,7 @@ proto_library(
         "//envoy/config/filter/fault/v2:pkg",
         "//envoy/config/filter/http/adaptive_concurrency/v2alpha:pkg",
         "//envoy/config/filter/http/buffer/v2:pkg",
+        "//envoy/config/filter/http/compressor/v2:pkg",
         "//envoy/config/filter/http/cors/v2:pkg",
         "//envoy/config/filter/http/csrf/v2:pkg",
         "//envoy/config/filter/http/dynamic_forward_proxy/v2alpha:pkg",
@@ -129,6 +130,7 @@ proto_library(
         "//envoy/extensions/filters/common/fault/v3:pkg",
         "//envoy/extensions/filters/http/adaptive_concurrency/v3:pkg",
         "//envoy/extensions/filters/http/buffer/v3:pkg",
+        "//envoy/extensions/filters/http/compressor/v3:pkg",
         "//envoy/extensions/filters/http/cors/v3:pkg",
         "//envoy/extensions/filters/http/csrf/v3:pkg",
         "//envoy/extensions/filters/http/dynamic_forward_proxy/v3:pkg",

source/extensions/filters/http/common/compressor/BUILD

@@ -0,0 +1,26 @@
+licenses(["notice"])  # Apache 2
+
+load(
+    "//bazel:envoy_build_system.bzl",
+    "envoy_cc_library",
+    "envoy_package",
+)
+
+envoy_package()
+
+envoy_cc_library(
+    name = "compressor_lib",
+    srcs = ["compressor.cc"],
+    hdrs = ["compressor.h"],
+    deps = [
+        "//include/envoy/compressor:compressor_interface",
+        "//include/envoy/stats:stats_macros",
+        "//include/envoy/stream_info:filter_state_interface",
+        "//source/common/buffer:buffer_lib",
+        "//source/common/http:header_map_lib",
+        "//source/common/protobuf",
+        "//source/common/runtime:runtime_lib",
+        "//source/extensions/filters/http/common:pass_through_filter_lib",
+        "@envoy_api//envoy/extensions/filters/http/compressor/v3:pkg_cc_proto",
+    ],
+)