syntax = "proto3";

package envoy.config.common.matcher.v3;

import "envoy/config/core/v3/extension.proto";
import "envoy/config/route/v3/route_components.proto";
import "envoy/type/matcher/v3/string.proto";

import "udpa/annotations/status.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.config.common.matcher.v3";
option java_outer_classname = "MatcherProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/common/matcher/v3;matcherv3";
option (udpa.annotations.file_status).package_version_status = ACTIVE;

// [#protodoc-title: Unified Matcher API]

// A matcher, which may traverse a matching tree in order to result in a match action.
// During matching, the tree will be traversed until a match is found, or if no match
// is found the action specified by the most specific on_no_match will be evaluated.
// As an on_no_match might result in another matching tree being evaluated, this process
// might repeat several times until the final OnMatch (or no match) is decided.
//
// .. note::
//   Please use the syntactically equivalent :ref:`matching API <envoy_v3_api_msg_.xds.type.matcher.v3.Matcher>`
message Matcher {
  // What to do if a match is successful.
  message OnMatch {
    oneof on_match {
      option (validate.required) = true;

      // Nested matcher to evaluate.
      // If the nested matcher does not match and does not specify
      // on_no_match, then this matcher is considered not to have
      // matched, even if a predicate at this level or above returned
      // true.
      Matcher matcher = 1;

      // Protocol-specific action to take.
      core.v3.TypedExtensionConfig action = 2;
    }

    // If true, the action will be taken but the caller will behave as if no
    // match was found. This applies both to actions directly encoded in the
    // action field and to actions returned from a nested matcher tree in the
    // matcher field. A subsequent matcher on_no_match action will be used
    // instead.
    //
    // This field is not supported in all contexts in which the matcher API is
    // used. If this field is set in a context in which it's not supported,
    // the resource will be rejected.
    bool keep_matching = 3;
  }

  // A linear list of field matchers.
  // The field matchers are evaluated in order, and the first match
  // wins.
  message MatcherList {
    // Predicate to determine if a match is successful.
    message Predicate {
      // Predicate for a single input field.
      message SinglePredicate {
        // Protocol-specific specification of input field to match on.
        // [#extension-category: envoy.matching.common_inputs]
        core.v3.TypedExtensionConfig input = 1 [(validate.rules).message = {required: true}];

        oneof matcher {
          option (validate.required) = true;

          // Built-in string matcher.
          type.matcher.v3.StringMatcher value_match = 2;

          // Extension for custom matching logic.
          // [#extension-category: envoy.matching.input_matchers]
          core.v3.TypedExtensionConfig custom_match = 3;
        }
      }

      // A list of two or more matchers. Used to allow using a list within a oneof.
      message PredicateList {
        repeated Predicate predicate = 1 [(validate.rules).repeated = {min_items: 2}];
      }

      oneof match_type {
        option (validate.required) = true;

        // A single predicate to evaluate.
        SinglePredicate single_predicate = 1;

        // A list of predicates to be OR-ed together.
        PredicateList or_matcher = 2;

        // A list of predicates to be AND-ed together.
        PredicateList and_matcher = 3;

        // The inverse of a predicate
        Predicate not_matcher = 4;
      }
    }

    // An individual matcher.
    message FieldMatcher {
      // Determines if the match succeeds.
      Predicate predicate = 1 [(validate.rules).message = {required: true}];

      // What to do if the match succeeds.
      OnMatch on_match = 2 [(validate.rules).message = {required: true}];
    }

    // A list of matchers. First match wins.
    repeated FieldMatcher matchers = 1 [(validate.rules).repeated = {min_items: 1}];
  }

  message MatcherTree {
    // A map of configured matchers. Used to allow using a map within a oneof.
    message MatchMap {
      map<string, OnMatch> map = 1 [(validate.rules).map = {min_pairs: 1}];
    }

    // Protocol-specific specification of input field to match on.
    core.v3.TypedExtensionConfig input = 1 [(validate.rules).message = {required: true}];

    // Exact or prefix match maps in which to look up the input value.
    // If the lookup succeeds, the match is considered successful, and
    // the corresponding OnMatch is used.
    oneof tree_type {
      option (validate.required) = true;

      MatchMap exact_match_map = 2;

      // Longest matching prefix wins.
      MatchMap prefix_match_map = 3;

      // Extension for custom matching logic.
      core.v3.TypedExtensionConfig custom_match = 4;
    }
  }

  oneof matcher_type {
    option (validate.required) = true;

    // A linear list of matchers to evaluate.
    MatcherList matcher_list = 1;

    // A match tree to evaluate.
    MatcherTree matcher_tree = 2;
  }

  // Optional ``OnMatch`` to use if the matcher failed.
  // If specified, the ``OnMatch`` is used, and the matcher is considered
  // to have matched.
  // If not specified, the matcher is considered not to have matched.
  OnMatch on_no_match = 3;
}

// Match configuration. This is a recursive structure which allows complex nested match
// configurations to be built using various logical operators.
// [#next-free-field: 11]
message MatchPredicate {
  // A set of match configurations used for logical operations.
  message MatchSet {
    // The list of rules that make up the set.
    repeated MatchPredicate rules = 1 [(validate.rules).repeated = {min_items: 2}];
  }

  oneof rule {
    option (validate.required) = true;

    // A set that describes a logical OR. If any member of the set matches, the match configuration
    // matches.
    MatchSet or_match = 1;

    // A set that describes a logical AND. If all members of the set match, the match configuration
    // matches.
    MatchSet and_match = 2;

    // A negation match. The match configuration will match if the negated match condition matches.
    MatchPredicate not_match = 3;

    // The match configuration will always match.
    bool any_match = 4 [(validate.rules).bool = {const: true}];

    // HTTP request headers match configuration.
    HttpHeadersMatch http_request_headers_match = 5;

    // HTTP request trailers match configuration.
    HttpHeadersMatch http_request_trailers_match = 6;

    // HTTP response headers match configuration.
    HttpHeadersMatch http_response_headers_match = 7;

    // HTTP response trailers match configuration.
    HttpHeadersMatch http_response_trailers_match = 8;

    // HTTP request generic body match configuration.
    HttpGenericBodyMatch http_request_generic_body_match = 9;

    // HTTP response generic body match configuration.
    HttpGenericBodyMatch http_response_generic_body_match = 10;
  }
}

// HTTP headers match configuration.
message HttpHeadersMatch {
  // HTTP headers to match.
  repeated route.v3.HeaderMatcher headers = 1;
}

// HTTP generic body match configuration.
// List of text strings and hex strings to be located in HTTP body.
// All specified strings must be found in the HTTP body for positive match.
// The search may be limited to specified number of bytes from the body start.
//
// .. attention::
//
//   Searching for patterns in HTTP body is potentially CPU-intensive. For each specified pattern, HTTP body is scanned byte by byte to find a match.
//   If multiple patterns are specified, the process is repeated for each pattern. If location of a pattern is known, ``bytes_limit`` should be specified
//   to scan only part of the HTTP body.
message HttpGenericBodyMatch {
  message GenericTextMatch {
    oneof rule {
      option (validate.required) = true;

      // Text string to be located in HTTP body.
      string string_match = 1 [(validate.rules).string = {min_len: 1}];

      // Sequence of bytes to be located in HTTP body.
      bytes binary_match = 2 [(validate.rules).bytes = {min_len: 1}];
    }
  }

  // Limits search to specified number of bytes - default zero (no limit - match entire captured buffer).
  uint32 bytes_limit = 1;

  // List of patterns to match.
  repeated GenericTextMatch patterns = 2 [(validate.rules).repeated = {min_items: 1}];
}
