Fix incorrectly generated repeated_path_param_separator

internal/descriptor/registry.go

@@ -182,7 +182,7 @@ func NewRegistry() *Registry {
 		openAPINamingStrategy:          "legacy",
 		visibilityRestrictionSelectors: make(map[string]bool),
 		repeatedPathParamSeparator: repeatedFieldSeparator{
-			name: "csv",
+			name: "multi",
 			sep:  ',',
 		},
 		fileOptions:    make(map[string]*options.Swagger),

protoc-gen-openapiv2/internal/genopenapi/template.go

@@ -330,7 +330,7 @@ func nestedQueryParams(message *descriptor.Message, field *descriptor.Field, pre
 			Enum:        schema.Enum,
 		}
 		if param.Type == "array" {
-			param.CollectionFormat = "multi"
+			param.CollectionFormat = reg.GetRepeatedPathParamSeparatorName()
 		}
 
 		param.Name = prefix + reg.FieldName(field)

protoc-gen-openapiv2/internal/genopenapi/template_test.go

@@ -486,6 +486,119 @@
 	}
 }
 
+func TestMessageToQueryParametersWithRepeatedPathParamSeparator(t *testing.T) {
+	type test struct {
+		MsgDescs          []*descriptorpb.DescriptorProto
+		Message           string
+		Params            []openapiParameterObject
+		RepeatedPathParam string
+	}
+
+	tests := []test{
+		{
+			MsgDescs: []*descriptorpb.DescriptorProto{
+				{
+					Name: proto.String("ExampleMessage"),
+					Field: []*descriptorpb.FieldDescriptorProto{
+						{
+							Name:   proto.String("c"),
+							Type:   descriptorpb.FieldDescriptorProto_TYPE_STRING.Enum(),
+							Label:  descriptorpb.FieldDescriptorProto_LABEL_REPEATED.Enum(),
+							Number: proto.Int32(3),
+						},
+					},
+				},
+			},
+			Message: "ExampleMessage",
+			Params: []openapiParameterObject{
+				{
+					Name:             "c",
+					In:               "query",
+					Required:         false,
+					Type:             "array",
+					CollectionFormat: "ssv",
+				},
+			},
+			RepeatedPathParam: "ssv",
+		},
+		{
+			MsgDescs: []*descriptorpb.DescriptorProto{
+				{
+					Name: proto.String("ExampleMessage"),
+					Field: []*descriptorpb.FieldDescriptorProto{
+						{
+							Name:   proto.String("c"),
+							Type:   descriptorpb.FieldDescriptorProto_TYPE_STRING.Enum(),
+							Label:  descriptorpb.FieldDescriptorProto_LABEL_REPEATED.Enum(),
+							Number: proto.Int32(3),
+						},
+					},
+				},
+			},
+			Message: "ExampleMessage",
+			Params: []openapiParameterObject{
+				{
+					Name:             "c",
+					In:               "query",
+					Required:         false,
+					Type:             "array",
+					CollectionFormat: "pipes",
+				},
+			},
+			RepeatedPathParam: "pipes",
+		},
+	}
+
+	for _, test := range tests {
+		reg := descriptor.NewRegistry()
+		reg.SetRepeatedPathParamSeparator(test.RepeatedPathParam)
+		msgs := []*descriptor.Message{}
+		for _, msgdesc := range test.MsgDescs {
+			msgs = append(msgs, &descriptor.Message{DescriptorProto: msgdesc})
+		}
+		file := descriptor.File{
+			FileDescriptorProto: &descriptorpb.FileDescriptorProto{
+				SourceCodeInfo: &descriptorpb.SourceCodeInfo{},
+				Name:           proto.String("example.proto"),
+				Package:        proto.String("example"),
+				Dependency:     []string{},
+				MessageType:    test.MsgDescs,
+				Service:        []*descriptorpb.ServiceDescriptorProto{},
+				Options: &descriptorpb.FileOptions{
+					GoPackage: proto.String("github.com/grpc-ecosystem/grpc-gateway/runtime/internal/examplepb;example"),
+				},
+			},
+			GoPkg: descriptor.GoPackage{
+				Path: "example.com/path/to/example/example.pb",
+				Name: "example_pb",
+			},
+			Messages: msgs,
+		}
+		err := reg.Load(&pluginpb.CodeGeneratorRequest{
+			ProtoFile: []*descriptorpb.FileDescriptorProto{file.FileDescriptorProto},
+		})
+		if err != nil {
+			t.Fatalf("failed to load code generator request: %v", err)
+		}
+
+		message, err := reg.LookupMsg("", ".example."+test.Message)
+		if err != nil {
+			t.Fatalf("failed to lookup message: %s", err)
+		}
+		params, err := messageToQueryParameters(message, reg, []descriptor.Parameter{}, nil, "")
+		if err != nil {
+			t.Fatalf("failed to convert message to query parameters: %s", err)
+		}
+		// avoid checking Items for array types
+		for i := range params {
+			params[i].Items = nil
+		}
+		if !reflect.DeepEqual(params, test.Params) {
+			t.Errorf("expected %v, got %v", test.Params, params)
+		}
+	}
+}
+
 func TestMessageToQueryParameters(t *testing.T) {
 	type test struct {
 		MsgDescs []*descriptorpb.DescriptorProto