Repository: googleapis/api-linter
Pull request #787 (2021-03-10 18:35:04)

feat: Add rule for AIP-162 List Revisions request name field
Part of #721.


Patch:
diff --git a/docs/rules/0162/list-revisions-request-name-field.md b/docs/rules/0162/list-revisions-request-name-field.md
new file mode 100644
index 0000000..77f79af
--- /dev/null
+++ b/docs/rules/0162/list-revisions-request-name-field.md
@@ -0,0 +1,91 @@
+---
+rule:
+  aip: 162
+  name: [core, '0162', list-revisions-request-name-field]
+  summary: List Revisions RPCs must have a `name` field in the request.
+permalink: /162/list-revisions-request-name-field
+redirect_from:
+  - /0162/list-revisions-request-name-field
+---
+
+# List Revisions requests: Name field
+
+This rule enforces that all List Revisions methods have a `string name`
+field in the request message, as mandated in [AIP-162][].
+
+## Details
+
+This rule looks at any message matching `List*RevisionsRequest` and complains if
+either the `name` field is missing or it has any type other than `string`.
+
+## Examples
+
+**Incorrect** code for this rule:
+
+```proto
+// Incorrect.
+// Should include a `string name` field.
+message ListBookRevisionsRequest {
+  int32 page_size = 1;
+
+  string page_token = 2;
+}
+```
+
+```proto
+// Incorrect.
+message ListBookRevisionsRequest {
+  // Field type should be `string`.
+  bytes name = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference).type = "library.googleapis.com/Book"
+  ];
+
+  int32 page_size = 2;
+
+  string page_token = 3;
+}
+```
+
+**Correct** code for this rule:
+
+```proto
+// Correct.
+message ListBookRevisionsRequest {
+  string name = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference).type = "library.googleapis.com/Book"
+  ];
+
+  int32 page_size = 2;
+
+  string page_token = 3;
+}
+```
+
+## Disabling
+
+If you need to violate this rule, use a leading comment above the message (if
+the `name` field is missing) or above the field (if it is the wrong type).
+Remember to also include an [aip.dev/not-precedent][] comment explaining why.
+
+```proto
+message ListBookRevisionsRequest {
+  // (-- api-linter: core::0162::list-revisions-request-name-field=disabled
+  //     aip.dev/not-precedent: We need to do this because reasons. --)
+  bytes name = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference).type = "library.googleapis.com/Book"
+  ];
+
+  int32 page_size = 2;
+
+  string page_token = 3;
+}
+```
+
+If you need to violate this rule for an entire file, place the comment at the
+top of the file.
+
+[aip-162]: https://aip.dev/162
+[aip.dev/not-precedent]: https://aip.dev/not-precedent
diff --git a/rules/aip0162/aip0162.go b/rules/aip0162/aip0162.go
index dac46cc..ee39e0c 100644
--- a/rules/aip0162/aip0162.go
+++ b/rules/aip0162/aip0162.go
@@ -46,6 +46,7 @@ func AddRules(r lint.RuleRegistry) error {
 		listRevisionsHTTPMethod,
 		listRevisionsHTTPURISuffix,
 		listRevisionsRequestMessageName,
+		listRevisionsRequestNameField,
 		listRevisionsResponseMessageName,
 		rollbackHTTPBody,
 		rollbackHTTPMethod,
diff --git a/rules/aip0162/list_revisions_request_name_field.go b/rules/aip0162/list_revisions_request_name_field.go
new file mode 100644
index 0000000..5b0cd59
--- /dev/null
+++ b/rules/aip0162/list_revisions_request_name_field.go
@@ -0,0 +1,27 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aip0162
+
+import (
+	"github.com/googleapis/api-linter/lint"
+	"github.com/googleapis/api-linter/rules/internal/utils"
+)
+
+// The List Revisions request message should have a name field.
+var listRevisionsRequestNameField = &lint.MessageRule{
+	Name:        lint.NewRuleName(162, "list-revisions-request-name-field"),
+	OnlyIf:      IsListRevisionsRequestMessage,
+	LintMessage: utils.LintFieldPresentAndSingularString("name"),
+}


Test patch:
diff --git a/rules/aip0162/list_revisions_request_name_field_test.go b/rules/aip0162/list_revisions_request_name_field_test.go
new file mode 100644
index 0000000..f15710a
--- /dev/null
+++ b/rules/aip0162/list_revisions_request_name_field_test.go
@@ -0,0 +1,51 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aip0162
+
+import (
+	"testing"
+
+	"github.com/googleapis/api-linter/rules/internal/testutils"
+	"github.com/jhump/protoreflect/desc"
+)
+
+func TestListRevisionsRequestNameField(t *testing.T) {
+	for _, test := range []struct {
+		name     string
+		RPC      string
+		Field    string
+		problems testutils.Problems
+	}{
+		{"Valid", "ListBookRevisions", "string name = 1;", nil},
+		{"Missing", "ListBookRevisions", "", testutils.Problems{{Message: "no `name`"}}},
+		{"InvalidType", "ListBookRevisions", "int32 name = 1;", testutils.Problems{{Suggestion: "string"}}},
+		{"IrrelevantRPCName", "ListBooks", "", nil},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			f := testutils.ParseProto3Tmpl(t, `
+				message {{.RPC}}Request {
+					{{.Field}}
+				}
+			`, test)
+			var d desc.Descriptor = f.GetMessageTypes()[0]
+			if test.name == "InvalidType" {
+				d = f.GetMessageTypes()[0].GetFields()[0]
+			}
+			if diff := test.problems.SetDescriptor(d).Diff(listRevisionsRequestNameField.Lint(f)); diff != "" {
+				t.Error(diff)
+			}
+		})
+	}
+}