feat(xds): Add header mutations library #12494
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This was referenced Nov 11, 2025
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This commit introduces configuration objects for the external authorization (ExtAuthz) filter and the gRPC service it uses. These classes provide a structured, immutable representation of the configuration defined in the xDS protobuf messages. The main new classes are: - `ExtAuthzConfig`: Represents the configuration for the `ExtAuthz` filter, including settings for the gRPC service, header mutation rules, and other filter behaviors. - `GrpcServiceConfig`: Represents the configuration for a gRPC service, including the target URI, credentials, and other settings. - `HeaderMutationRulesConfig`: Represents the configuration for header mutation rules. This commit also includes parsers to create these configuration objects from the corresponding protobuf messages, as well as unit tests for the new classes.
This commit introduces the `CheckRequestBuilder` library, which is responsible for constructing the `CheckRequest` message sent to the external authorization service. The `CheckRequestBuilder` gathers information from various sources, including: - `ServerCall` attributes (local and remote addresses, SSL session). - `MethodDescriptor` (full method name). - Request headers. It uses this information to populate the `AttributeContext` of the `CheckRequest` message, which provides the authorization service with the necessary context to make an authorization decision. This commit also introduces the `ExtAuthzCertificateProvider`, a helper class for extracting certificate information, such as the principal and PEM-encoded certificate. Unit tests for the new components are also included.
This commit introduces a library for handling header mutations as specified by the xDS protocol. This library provides the core functionality for modifying request and response headers based on a set of rules. The main components of this library are: - `HeaderMutator`: Applies header mutations to `Metadata` objects. - `HeaderMutationFilter`: Filters header mutations based on a set of configurable rules, such as disallowing mutations of system headers. - `HeaderMutations`: A value class that represents the set of mutations to be applied to request and response headers. - `HeaderMutationDisallowedException`: An exception that is thrown when a disallowed header mutation is attempted. This commit also includes comprehensive unit tests for the new library.
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This PR sits on top of #12493, so only the last commit + any fixups need to be reviewed.
This commit introduces a library for handling header mutations as specified by the xDS protocol. This library provides the core functionality for modifying request and response headers based on a set of rules.
The main components of this library are:
HeaderMutator: Applies header mutations toMetadataobjects.HeaderMutationFilter: Filters header mutations based on a set of configurable rules, such as disallowing mutations of system headers.HeaderMutations: A value class that represents the set of mutations to be applied to request and response headers.HeaderMutationDisallowedException: An exception that is thrown when a disallowed header mutation is attempted.This commit also includes comprehensive unit tests for the new library.