Protobuf Validation

This extension integrates protovalidate and protoc-gen-validate. They are used to validate the Protobuf messages.

tip

protovalidate is the successor to protoc-gen-validate, so it is recommended to use protovalidate.

Dependencies

protovalidate

Gradle

implementation("io.github.danielliu1123:grpc-starter-protovalidate")

Maven

<dependency>
    <groupId>io.github.danielliu1123</groupId>
    <artifactId>grpc-starter-protovalidate</artifactId>
</dependency>

protoc-gen-validate

Gradle

implementation("io.github.danielliu1123:grpc-starter-validation")

Maven

<dependency>
    <groupId>io.github.danielliu1123</groupId>
    <artifactId>grpc-starter-validation</artifactId>
</dependency>

Example

protovalidate

Refer to protovalidate example.

syntax = "proto3";

package foo;

import "buf/validate/validate.proto";

message Foo {
    string id = 1 [(buf.validate.field).cel = {
        id: "id",
        message: "id length must be at least 5 characters",
        expression: "this.size() >= 5",
    }];
    string name = 2 [(buf.validate.field).string = {min_len: 5}];
    repeated string hobbies = 3 [(buf.validate.field).repeated = {min_items: 1}];

    option (buf.validate.message).cel = {
        id: "foo",
        message: "not a valid Foo",
        expression: "this.name != 'programmer' && !('coding' in this.hobbies)",
    };
}

service FooService {
    rpc InsertFoo (Foo) returns (Foo) {}
}

protoc-gen-validate

Refer to validation example.

syntax = "proto3";

package foo;

import "validate/validate.proto";

message Foo {
    string name = 2 [(validate.rules).string = {
        min_len: 2
        max_len: 10
    }];
    repeated string hobbies = 3 [(validate.rules).repeated = {
        min_items: 1
    }];
}

service FooService {
    rpc InsertFoo (Foo) returns (Foo) {}
}

These validation rules will be applied to the gRPC client and server by default.

info

For more information about the validation rules, see protovalidate and protoc-gen-validate

Configurations

If you want to disable the validation, use the following configuration:

grpc:
  validation:
    enabled: false # disable the validation for client and server

Only disable the validation for the client:

grpc:
  validation:
    client:
      enabled: false

Only disable the validation for the server:

grpc:
  validation:
    server:
      enabled: false

The verification processing is implemented through ClientInterceptor and ServerInterceptor. The order of interceptors can be customized. The default order is 0.

grpc:
  validation:
    client:
      order: 0
    server:
      order: 0