protoc-gen-go-validate

protoc-gen-go-validate

Plugin for the Google Protocol Buffers compiler protoc that generates common validation code for Golang applications.

Install

$ go install github.com/picatz/protoc-gen-go-validate
...

$ make install
...

Usage

$ protoc -I protos --go_out=. --go-validate_out=. example.proto
...

Note: you can use the --go-validate_opt=module=github.com/owner/module flag when using Go modules.

All validation protobuf options are documented here.

Validate Message Fields

Protobuf message fields can use (validate.field) field options.

• (validate.field).message: Define validation rules for message fields.

  message Outer {
    message Inner {}
  
    Inner inner = 1 [(validate.field).message = {
      required: true,
    }];
  }
  

• (validate.field).string: Define validation rules for message fields of type string.

  message CreateUserRequest {
    string name = 1 [(validate.field).string = {
      min: 1,
      max: 255,
      allow_space: false,
      ascii_only: true,
    }];
    string password = 2 [(validate.field).string = {
      min: 8,
      max: 255,
    }];
  }
  

• (validate.field).bytes: Define validation rules for message fields of type bytes.

  message UploadBlobRequest {
    bytes blob = 1 [(validate.field).bytes = {
      min: 1,
      max: 1024,
    }];
  }
  

• (validate.field).uint32: Define validation rules for message fields of type uint32.

  message AddPointsRequest {
    uint32 points = 1 [(validate.field).uint32 = {
      gte: 1,
      lte: 100,
    }];
  }
  

• (validate.field).uint64: Define validation rules for message fields of type uint64.

  message AddPointsRequest {
    uint64 points = 1 [(validate.field).uint64 = {
      gte: 1,
      lte: 100,
    }];
  }
  

• (validate.field).int32: Define validation rules for message fields of type int32.

  message AddPointsRequest {
    int32 points = 1 [(validate.field).int32 = {
      gte: 1,
      lte: 100,
    }];
  }
  

• (validate.field).int64: Define validation rules for message fields of type int64.

  message AddPointsRequest {
    int64 points = 1 [(validate.field).int64 = {
      gte: 1,
      lte: 100,
    }];
  }
  

• (validate.field).float: Define validation rules for message fields of type float32.

  message AddFuelRequest {
    float ammount = 1 [(validate.field).float = {
      gt: 0,
    }];
  }
  

• (validate.field).double: Define validation rules for message fields of type double.

  message AddFuelRequest {
    double ammount = 1 [(validate.field).double = {
      gt: 0,
    }];
  }
  

• (validate.field).repeated: Define validation rules for message fields of type repeated.

  message AddFuelRequest {
    repeated string fuel_types = 1 [(validate.field).repeated = {
      min: 1,
      max: 3,
    }];
  }
  

String Validation Rules

• len: Require field value have a specific length.

  message ReadUserByIDRequest {
    string uuid = 1 [(validate.field).string.len = 16];
  }
  

• gt: Require field value be greater than a specific length.

  message ReadUserByEmailRequest {
    string email = 1 [(validate.field).string.gt = 0];
  }
  

• lt: Require field value be less than a specific length.

  message RegisterUserRequest {
    string email = 1 [(validate.field).string.lt = 256];
  }
  

• contains: Require field value contains a specific sub-string.

  message RegisterUserRequest {
    string email = 1 [(validate.field).string.contains = "@"];
  }
  

• not_contains: Require field value does not contain a specific sub-string.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.not_contains = " "];
  }
  

• prefix: Require field value has a specific prefix.

  message TweetAtUserRequest {
    string name = 1 [(validate.field).string.prefix = "@"];
  }
  

• suffix: Require field value has a specific suffix.

  message WriteRequest {
    string paragraph = 1 [(validate.field).string.suffix = "."];
  }
  

• allow_space: Allow (or not) spaces.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.allow_spaces = false];
  }
  

• ascii_only: Require field value uses only ASCII characters.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.ascii_only = true];
  }
  

• min: Require field value have a specific minimum length.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.min = 1];
  }
  

• max: Require field value have a specific maximum length.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.max = 255];
  }
  

• match: Require field value match a specific regular expression.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.match = "[[:alpha:]]"];
  }
  

• not_match: Require field value does not match a specific regular expression.

  message RegisterUserRequest {
    string non_alpha_name = 1 [(validate.field).string.not_match = "[[:alpha:]]"];
  }
  

• required: Require a non-empty string.

  message RegisterUserRequest {
    string name = 1 [(validate.field).string.required = true];
  }
  

Bytes Validation Rules

• len: Require field value have a specific length.

  message CheckCertificateRequest {
    bytes pem_block = 1 [(validate.field).bytes.len = 2000];
  }
  

• gt: Require field value be greater than a specific length.

  message SignMessageRequest {
    bytes msg = 1 [(validate.field).bytes.gt = 0];
  }
  

• lt: Require field value be less than a specific length.

  message SignMessageRequest {
    bytes msg = 1 [(validate.field).bytes.lt = 5000];
  }
  

• gte: Require field value be greater than or equal to a specific length.

  message SignMessageRequest {
    bytes msg = 1 [(validate.field).bytes.gte = 1];
  }
  

• lte: Require field value be less than or equal to a specific length.

  message SignMessageRequest {
    bytes msg = 1 [(validate.field).bytes.lte = 500];
  }
  

• min: Require field value to have a specific minimum length.

  message SignMessageRequest {
    bytes msg = 1 [(validate.field).bytes.min = 1];
  }
  

• max: Require field value to have a specific maximum length.

  message SignMessageRequest {
    bytes msg = 1 [(validate.field).bytes.max = 500];
  }
  

• prefix: Require field value to have a specific prefix.

  message StoreKeyRequest {
    bytes key = 1 [(validate.field).bytes.prefix = "-----BEGIN PRIVATE KEY-----\n"];
  }
  

• suffix: Require field value to have a specific suffix.

  message StoreKeyRequest {
    bytes key = 1 [(validate.field).bytes.suffix = "-----END PRIVATE KEY-----\n"];
  }
  

• required: Require a non-empty chunk of bytes.

  message StoreKeyRequest {
    bytes key = 1 [(validate.field).bytes.required = true];
  }
  

UInt32 Validation Rules

• eq: Require field value to equal a specific value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.eq = 10];
  }
  

• gt: Require field value be greater than a specific value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.gt = 0];
  }
  

• lt: Require field value be less than a specific value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.lt = 1000];
  }
  

• gte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.gte = 1];
  }
  

• lte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.lte = 100];
  }
  

• min: Require field value to have a specific minimum value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.min = 1];
  }
  

• max: Require field value to have a specific maximum value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.min = 1];
  }
  

• required: Require field to have a non-empty and non-zero value.

  message AwardPointsRequest {
    uint32 points = 1 [(validate.field).uint32.required = true];
  }
  

Int32 Validation Rules

• eq: Require field value to equal a specific value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.eq = 10];
  }
  

• gt: Require field value be greater than a specific value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.gt = 0];
  }
  

• lt: Require field value be less than a specific value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.lt = 1000];
  }
  

• gte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.gte = 1];
  }
  

• lte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.lte = 100];
  }
  

• min: Require field value to have a specific minimum value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.min = 1];
  }
  

• max: Require field value to have a specific maximum value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.min = 1];
  }
  

• required: Require field to have a non-empty and non-zero value.

  message AwardPointsRequest {
    int32 points = 1 [(validate.field).int32.required = true];
  }
  

UInt64 Validation Rules

• eq: Require field value to equal a specific value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.eq = 10];
  }
  

• gt: Require field value be greater than a specific value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.gt = 0];
  }
  

• lt: Require field value be less than a specific value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.lt = 1000];
  }
  

• gte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.gte = 1];
  }
  

• lte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.lte = 100];
  }
  

• min: Require field value to have a specific minimum value.

  message AwardPointsRequest {
    uint points = 1 [(validate.field).uint64.min = 1];
  }
  

• max: Require field value to have a specific maximum value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.min = 1];
  }
  

• required: Require field to have a non-empty and non-zero value.

  message AwardPointsRequest {
    uint64 points = 1 [(validate.field).uint64.required = true];
  }
  

Int64 Validation Rules

• eq: Require field value to equal a specific value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.eq = 10];
  }
  

• gt: Require field value be greater than a specific value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.gt = 0];
  }
  

• lt: Require field value be less than a specific value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.lt = 1000];
  }
  

• gte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.gte = 1];
  }
  

• lte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.lte = 100];
  }
  

• min: Require field value to have a specific minimum value.

  message AwardPointsRequest {
    uint points = 1 [(validate.field).int64.min = 1];
  }
  

• max: Require field value to have a specific maximum value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.min = 1];
  }
  

• required: Require field to have a non-empty and non-zero value.

  message AwardPointsRequest {
    int64 points = 1 [(validate.field).int64.required = true];
  }
  

Float Validation Rules

• eq: Require field value to equal a specific value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.eq = 10];
  }
  

• gt: Require field value be greater than a specific value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.gt = 0];
  }
  

• lt: Require field value be less than a specific value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.lt = 1000];
  }
  

• gte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.gte = 1];
  }
  

• lte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.lte = 100];
  }
  

• min: Require field value to have a specific minimum value.

  message AwardPointsRequest {
    uint points = 1 [(validate.field).float.min = 1];
  }
  

• max: Require field value to have a specific maximum value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.min = 1];
  }
  

• required: Require field to have a non-empty and non-zero value.

  message AwardPointsRequest {
    float points = 1 [(validate.field).float.required = true];
  }
  

Double Validation Rules

• eq: Require field value to equal a specific value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.eq = 10];
  }
  

• gt: Require field value be greater than a specific value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.gt = 0];
  }
  

• lt: Require field value be less than a specific value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.lt = 1000];
  }
  

• gte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.gte = 1];
  }
  

• lte: Require field value be greater than or equal to a specific value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.lte = 100];
  }
  

• min: Require field value to have a specific minimum value.

  message AwardPointsRequest {
    uint points = 1 [(validate.field).double.min = 1];
  }
  

• max: Require field value to have a specific maximum value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.min = 1];
  }
  

• required: Require field to have a non-empty and non-zero value.

  message AwardPointsRequest {
    double points = 1 [(validate.field).double.required = true];
  }
  

Message Validation Rules

• skip: Skip specifies that the validation rules of this field should not be evaluated
• required: Required specifies that this field must be set

Repeated Validation Rules

• min: MinItems specifies that this field must have the specified number of items at a minimum
• max: MaxItems specifies that this field must have the specified number of items at a maximum