Resource reference package

This rule enforces that resource reference annotations refer resources defined in the same package, as described in AIP-124.

Details

This rule scans all fields with google.api.resource_reference annotations, and complains if the type on them refers to a resource that is defined in a different protobuf package.

Certain common resource types are exempt from this rule.

Examples

Incorrect code for this rule:

// Incorrect.
package google.example.library.v1;

message Book {
  option (google.api.resource) = {
    type: "library.googleapis.com/Book"
    pattern: "publishers/{publisher}/books/{book}"
  };

  string name = 1;

  // ...
}

// Incorrect.
package google.example.libray.v1;  // Typo: Different package.

message GetBookRequest {
  string name = 1 [(google.api.resource_reference) = {
    type: "library.googleapis.com/Book"  // Lint warning: package mismatch.
  }];
}

Correct code for this rule:

// Correct.
package google.example.library;

message Book {
  option (google.api.resource) = {
    type: "library.googleapis.com/Book"
    pattern: "publishers/{publisher}/books/{book}"
  };

  string name = 1;

  // ...
}

message GetBookRequest {
  string name = 1 [(google.api.resource_reference) = {
    type: "library.googleapis.com/Book"
  }];
}

Disabling

If you need to violate this rule, use a leading comment above the field. Remember to also include an aip.dev/not-precedent comment explaining why.

package google.example.library.common;

message Book {
  option (google.api.resource) = {
    type: "library.googleapis.com/Book"
    pattern: "publishers/{publisher}/books/{book}"
  };
}

package google.example.library.v1;

message GetBookRequest {
  // (-- api-linter: core::0124::reference-same-package=disabled
  //     aip.dev/not-precedent: We need to do this because reasons. --)
  string name = 1 [(google.api.resource_reference) = {
    type: "library.googleapis.com/Book"
  }];
}

If you need to violate this rule for an entire file, place the comment at the top of the file.