api: introduce TypedExtensionConfig. (#11105)

A common wrapper for name/Any that should be used for all new extensions
throughout the API.

I've left a note that we need to revisit existing typed_config at the
next major version as well, since that would be a breaking change.

Signed-off-by: Harvey Tuch <htuch@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ b16981f8d4f4726d5f8d31b55603f893fbba5575

envoy/config/core/v3/extension.proto

@@ -0,0 +1,30 @@
+syntax = "proto3";
+
+package envoy.config.core.v3;
+
+import "google/protobuf/any.proto";
+
+import "udpa/annotations/status.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.config.core.v3";
+option java_outer_classname = "ExtensionProto";
+option java_multiple_files = true;
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// [#protodoc-title: Extension configuration]
+
+// Message type for extension configuration.
+// [#next-major-version: revisit all existing typed_config that doesn't use this wrapper.].
+message TypedExtensionConfig {
+  // The name of an extension. This is not used to select the extension, instead
+  // it serves the role of an opaque identifier.
+  string name = 1 [(validate.rules).string = {min_len: 1}];
+
+  // The typed config for the extension. The type URL will be used to identify
+  // the extension. In the case that the type URL is *udpa.type.v1.TypedStruct*,
+  // the inner type URL of *TypedStruct* will be utilized. See the
+  // :ref:`extension configuration overview
+  // <config_overview_extension_configuration>` for further details.
+  google.protobuf.Any typed_config = 2 [(validate.rules).any = {required: true}];
+}

envoy/config/core/v4alpha/extension.proto

@@ -0,0 +1,34 @@
+syntax = "proto3";
+
+package envoy.config.core.v4alpha;
+
+import "google/protobuf/any.proto";
+
+import "udpa/annotations/status.proto";
+import "udpa/annotations/versioning.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.config.core.v4alpha";
+option java_outer_classname = "ExtensionProto";
+option java_multiple_files = true;
+option (udpa.annotations.file_status).package_version_status = NEXT_MAJOR_VERSION_CANDIDATE;
+
+// [#protodoc-title: Extension configuration]
+
+// Message type for extension configuration.
+// [#next-major-version: revisit all existing typed_config that doesn't use this wrapper.].
+message TypedExtensionConfig {
+  option (udpa.annotations.versioning).previous_message_type =
+      "envoy.config.core.v3.TypedExtensionConfig";
+
+  // The name of an extension. This is not used to select the extension, instead
+  // it serves the role of an opaque identifier.
+  string name = 1 [(validate.rules).string = {min_len: 1}];
+
+  // The typed config for the extension. The type URL will be used to identify
+  // the extension. In the case that the type URL is *udpa.type.v1.TypedStruct*,
+  // the inner type URL of *TypedStruct* will be utilized. See the
+  // :ref:`extension configuration overview
+  // <config_overview_extension_configuration>` for further details.
+  google.protobuf.Any typed_config = 2 [(validate.rules).any = {required: true}];
+}