compression: create a decompressor extensibility point and move gzip decompressor

CODEOWNERS

@@ -114,3 +114,6 @@ extensions/filters/common/original_src @snowp @klarose
 /*/extensions/filters/network/local_ratelimit @mattklein123 @junr03
 /*/extensions/filters/http/aws_request_signing @rgs1 @derekargueta @mattklein123 @marcomagdy
 /*/extensions/filters/http/aws_lambda @mattklein123 @marcomagdy @lavignes
+# Compression
+/*/extensions/compression/common @junr03 @rojkov
+/*/extensions/compression/gzip @junr03 @rojkov

api/BUILD

@@ -162,6 +162,7 @@ proto_library(
         "//envoy/extensions/common/ratelimit/v3:pkg",
         "//envoy/extensions/common/tap/v3:pkg",
         "//envoy/extensions/compression/gzip/compressor/v3:pkg",
+        "//envoy/extensions/compression/gzip/decompressor/v3:pkg",
         "//envoy/extensions/filters/common/fault/v3:pkg",
         "//envoy/extensions/filters/http/adaptive_concurrency/v3:pkg",
         "//envoy/extensions/filters/http/aws_lambda/v3:pkg",

api/envoy/extensions/compression/gzip/compressor/v3/gzip.proto

@@ -13,7 +13,7 @@ option java_outer_classname = "GzipProto";
 option java_multiple_files = true;
 option (udpa.annotations.file_status).package_version_status = ACTIVE;
 
-// [#protodoc-title: Gzip]
+// [#protodoc-title: Gzip Compressor]
 // [#extension: envoy.compression.gzip.compressor]
 
 // [#next-free-field: 6]

api/envoy/extensions/compression/gzip/decompressor/v3/BUILD

@@ -0,0 +1,9 @@
+# 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 = ["@com_github_cncf_udpa//udpa/annotations:pkg"],
+)

api/envoy/extensions/compression/gzip/decompressor/v3/gzip.proto

@@ -0,0 +1,30 @@
+syntax = "proto3";
+
+package envoy.extensions.compression.gzip.decompressor.v3;
+
+import "google/protobuf/wrappers.proto";
+
+import "udpa/annotations/migrate.proto";
+import "udpa/annotations/status.proto";
+import "udpa/annotations/versioning.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.compression.gzip.decompressor.v3";
+option java_outer_classname = "GzipProto";
+option java_multiple_files = true;
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// [#protodoc-title: Gzip Decompressor]
+// [#extension: envoy.compression.gzip.decompressor]
+
+message Gzip {
+  // Value from 9 to 15 that represents the base two logarithmic of the decompressor's window size.
+  // The decompression window size needs to be equal or larger than the compression window size.
+  // The default is 15 per zlib's manual. For more details about this parameter, please refer to
+  // zlib manual > inflateInit2.
+  google.protobuf.UInt32Value window_bits = 1 [(validate.rules).uint32 = {lte: 15 gte: 9}];
+
+  // Value for zlib's decompressor output buffer. If not set, defaults to 4096.
+  // See https://www.zlib.net/manual.html for more details.
+  google.protobuf.UInt32Value chunk_size = 2 [(validate.rules).uint32 = {lte: 65536 gte: 4096}];
+}

api/versioning/BUILD

@@ -45,6 +45,7 @@ proto_library(
         "//envoy/extensions/common/ratelimit/v3:pkg",
         "//envoy/extensions/common/tap/v3:pkg",
         "//envoy/extensions/compression/gzip/compressor/v3:pkg",
+        "//envoy/extensions/compression/gzip/decompressor/v3:pkg",
         "//envoy/extensions/filters/common/fault/v3:pkg",
         "//envoy/extensions/filters/http/adaptive_concurrency/v3:pkg",
         "//envoy/extensions/filters/http/aws_lambda/v3:pkg",

include/envoy/compression/compressor/config.h

@@ -15,6 +15,8 @@ class NamedCompressorLibraryConfigFactory : public Config::TypedFactory {
   virtual CompressorFactoryPtr
   createCompressorFactoryFromProto(const Protobuf::Message& config,
                                    Server::Configuration::FactoryContext& context) PURE;
+
+  std::string category() const override { return "envoy.compression.compressor"; }
 };
 
 } // namespace Compressor

include/envoy/compression/decompressor/BUILD

@@ -0,0 +1,35 @@
+licenses(["notice"])  # Apache 2
+
+load(
+    "//bazel:envoy_build_system.bzl",
+    "envoy_cc_library",
+    "envoy_package",
+)
+
+envoy_package()
+
+envoy_cc_library(
+    name = "decompressor_config_interface",
+    hdrs = ["config.h"],
+    deps = [
+        ":decompressor_factory_interface",
+        "//include/envoy/config:typed_config_interface",
+        "//include/envoy/server:filter_config_interface",
+    ],
+)
+
+envoy_cc_library(
+    name = "decompressor_factory_interface",
+    hdrs = ["factory.h"],
+    deps = [
+        ":decompressor_interface",
+    ],
+)
+
+envoy_cc_library(
+    name = "decompressor_interface",
+    hdrs = ["decompressor.h"],
+    deps = [
+        "//include/envoy/buffer:buffer_interface",
+    ],
+)

include/envoy/compression/decompressor/config.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "envoy/compression/decompressor/factory.h"
+#include "envoy/config/typed_config.h"
+#include "envoy/server/filter_config.h"
+
+namespace Envoy {
+namespace Compression {
+namespace Decompressor {
+
+class NamedDecompressorLibraryConfigFactory : public Config::TypedFactory {
+public:
+  ~NamedDecompressorLibraryConfigFactory() override = default;
+
+  virtual DecompressorFactoryPtr
+  createDecompressorFactoryFromProto(const Protobuf::Message& config,
+                                     Server::Configuration::FactoryContext& context) PURE;
+
+  std::string category() const override { return "envoy.compression.decompressor"; }
+};
+
+} // namespace Decompressor
+} // namespace Compression
+} // namespace Envoy

include/envoy/decompressor/decompressor.h → include/envoy/compression/decompressor/decompressor.h

@@ -3,6 +3,7 @@
 #include "envoy/buffer/buffer.h"
 
 namespace Envoy {
+namespace Compression {
 namespace Decompressor {
 
 /**
@@ -21,5 +22,8 @@ class Decompressor {
                           Buffer::Instance& output_buffer) PURE;
 };
 
+using DecompressorPtr = std::unique_ptr<Decompressor>;
+
 } // namespace Decompressor
+} // namespace Compression
 } // namespace Envoy

include/envoy/compression/decompressor/factory.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "envoy/compression/decompressor/decompressor.h"
+
+namespace Envoy {
+namespace Compression {
+namespace Decompressor {
+
+class DecompressorFactory {
+public:
+  virtual ~DecompressorFactory() = default;
+
+  virtual DecompressorPtr createDecompressor() PURE;
+  virtual const std::string& statsPrefix() const PURE;
+  // TODO(junr03): this method assumes that decompressors are used on http messages.
+  // A more generic method might be `hint()` which gives the user of the decompressor a hint about
+  // the type of decompression that it can perform.
+  virtual const std::string& contentEncoding() const PURE;
+};
+
+using DecompressorFactoryPtr = std::unique_ptr<DecompressorFactory>;
+
+} // namespace Decompressor
+} // namespace Compression
+} // namespace Envoy

source/common/common/zlib/base.h

@@ -12,6 +12,7 @@ namespace Zlib {
 /**
  * Shared code between the compressor and the decompressor.
  */
+// TODO(junr03): move to extensions tree once the compressor side is moved to extensions.
 class Base {
 public:
   Base(uint64_t chunk_size, std::function<void(z_stream*)> zstream_deleter);

source/extensions/compression/common/compressor/factory_base.h

@@ -26,8 +26,6 @@ class CompressorLibraryFactoryBase
     return std::make_unique<ConfigProto>();
   }
 
-  std::string category() const override { return "envoy.compression.compressor"; }
-
   std::string name() const override { return name_; }
 
 protected:
@@ -36,6 +34,7 @@ class CompressorLibraryFactoryBase
 private:
   virtual Envoy::Compression::Compressor::CompressorFactoryPtr
   createCompressorFactoryFromProtoTyped(const ConfigProto&) PURE;
+
   const std::string name_;
 };
 

include/envoy/decompressor/BUILD → source/extensions/compression/common/decompressor/BUILD

@@ -9,9 +9,9 @@ load(
 envoy_package()
 
 envoy_cc_library(
-    name = "decompressor_interface",
-    hdrs = ["decompressor.h"],
+    name = "decompressor_factory_base_lib",
+    hdrs = ["factory_base.h"],
     deps = [
-        "//include/envoy/buffer:buffer_interface",
+        "//include/envoy/compression/decompressor:decompressor_config_interface",
     ],
 )

source/extensions/compression/common/decompressor/factory_base.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include "envoy/compression/decompressor/config.h"
+
+namespace Envoy {
+namespace Extensions {
+namespace Compression {
+namespace Common {
+namespace Decompressor {
+
+template <class ConfigProto>
+class DecompressorLibraryFactoryBase
+    : public Envoy::Compression::Decompressor::NamedDecompressorLibraryConfigFactory {
+public:
+  Envoy::Compression::Decompressor::DecompressorFactoryPtr
+  createDecompressorFactoryFromProto(const Protobuf::Message& proto_config,
+                                     Server::Configuration::FactoryContext& context) override {
+    return createDecompressorFactoryFromProtoTyped(
+        MessageUtil::downcastAndValidate<const ConfigProto&>(proto_config,
+                                                             context.messageValidationVisitor()));
+  }
+
+  ProtobufTypes::MessagePtr createEmptyConfigProto() override {
+    return std::make_unique<ConfigProto>();
+  }
+
+  std::string name() const override { return name_; }
+
+protected:
+  DecompressorLibraryFactoryBase(const std::string& name) : name_(name) {}
+
+private:
+  virtual Envoy::Compression::Decompressor::DecompressorFactoryPtr
+  createDecompressorFactoryFromProtoTyped(const ConfigProto&) PURE;
+
+  const std::string name_;
+};
+
+} // namespace Decompressor
+} // namespace Common
+} // namespace Compression
+} // namespace Extensions
+} // namespace Envoy

source/extensions/compression/gzip/decompressor/BUILD

@@ -0,0 +1,37 @@
+licenses(["notice"])  # Apache 2
+
+load(
+    "//bazel:envoy_build_system.bzl",
+    "envoy_cc_extension",
+    "envoy_cc_library",
+    "envoy_package",
+)
+
+envoy_package()
+
+envoy_cc_library(
+    name = "zlib_decompressor_impl_lib",
+    srcs = ["zlib_decompressor_impl.cc"],
+    hdrs = ["zlib_decompressor_impl.h"],
+    external_deps = ["zlib"],
+    deps = [
+        "//include/envoy/compression/decompressor:decompressor_interface",
+        "//source/common/buffer:buffer_lib",
+        "//source/common/common:assert_lib",
+        "//source/common/common:minimal_logger_lib",
+        "//source/common/common:zlib_base_lib",
+    ],
+)
+
+envoy_cc_extension(
+    name = "config",
+    srcs = ["config.cc"],
+    hdrs = ["config.h"],
+    security_posture = "robust_to_untrusted_downstream",
+    deps = [
+        ":zlib_decompressor_impl_lib",
+        "//source/common/http:headers_lib",
+        "//source/extensions/compression/common/decompressor:decompressor_factory_base_lib",
+        "@envoy_api//envoy/extensions/compression/gzip/decompressor/v3:pkg_cc_proto",
+    ],
+)