diff --git a/vendor/github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/genswagger/generator.go b/vendor/github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/genswagger/generator.go
new file mode 100644
index 0000000..31409ac
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/genswagger/generator.go
@@ -0,0 +1,247 @@
+package genswagger
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"path/filepath"
+	"reflect"
+	"strings"
+
+	"github.com/golang/glog"
+	pbdescriptor "github.com/golang/protobuf/descriptor"
+	"github.com/golang/protobuf/proto"
+	protocdescriptor "github.com/golang/protobuf/protoc-gen-go/descriptor"
+	plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
+	"github.com/golang/protobuf/ptypes/any"
+	"github.com/grpc-ecosystem/grpc-gateway/internal"
+	"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
+	gen "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/generator"
+	swagger_options "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/options"
+)
+
+var (
+	errNoTargetService = errors.New("no target service defined in the file")
+)
+
+type generator struct {
+	reg *descriptor.Registry
+}
+
+type wrapper struct {
+	fileName string
+	swagger  *swaggerObject
+}
+
+// New returns a new generator which generates grpc gateway files.
+func New(reg *descriptor.Registry) gen.Generator {
+	return &generator{reg: reg}
+}
+
+// Merge a lot of swagger file (wrapper) to single one swagger file
+func mergeTargetFile(targets []*wrapper, mergeFileName string) *wrapper {
+	var mergedTarget *wrapper
+	for _, f := range targets {
+		if mergedTarget == nil {
+			mergedTarget = &wrapper{
+				fileName: mergeFileName,
+				swagger:  f.swagger,
+			}
+		} else {
+			for k, v := range f.swagger.Definitions {
+				mergedTarget.swagger.Definitions[k] = v
+			}
+			for k, v := range f.swagger.StreamDefinitions {
+				mergedTarget.swagger.StreamDefinitions[k] = v
+			}
+			for k, v := range f.swagger.Paths {
+				mergedTarget.swagger.Paths[k] = v
+			}
+			for k, v := range f.swagger.SecurityDefinitions {
+				mergedTarget.swagger.SecurityDefinitions[k] = v
+			}
+			mergedTarget.swagger.Security = append(mergedTarget.swagger.Security, f.swagger.Security...)
+		}
+	}
+	return mergedTarget
+}
+
+func fieldName(k string) string {
+	return strings.ReplaceAll(strings.Title(k), "-", "_")
+}
+
+// Q: What's up with the alias types here?
+// A: We don't want to completely override how these structs are marshaled into
+//    JSON, we only want to add fields (see below, extensionMarshalJSON).
+//    An infinite recursion would happen if we'd call json.Marshal on the struct
+//    that has swaggerObject as an embedded field. To avoid that, we'll create
+//    type aliases, and those don't have the custom MarshalJSON methods defined
+//    on them. See http://choly.ca/post/go-json-marshalling/ (or, if it ever
+//    goes away, use
+//    https://web.archive.org/web/20190806073003/http://choly.ca/post/go-json-marshalling/.
+func (so swaggerObject) MarshalJSON() ([]byte, error) {
+	type alias swaggerObject
+	return extensionMarshalJSON(alias(so), so.extensions)
+}
+
+func (so swaggerInfoObject) MarshalJSON() ([]byte, error) {
+	type alias swaggerInfoObject
+	return extensionMarshalJSON(alias(so), so.extensions)
+}
+
+func (so swaggerSecuritySchemeObject) MarshalJSON() ([]byte, error) {
+	type alias swaggerSecuritySchemeObject
+	return extensionMarshalJSON(alias(so), so.extensions)
+}
+
+func (so swaggerOperationObject) MarshalJSON() ([]byte, error) {
+	type alias swaggerOperationObject
+	return extensionMarshalJSON(alias(so), so.extensions)
+}
+
+func (so swaggerResponseObject) MarshalJSON() ([]byte, error) {
+	type alias swaggerResponseObject
+	return extensionMarshalJSON(alias(so), so.extensions)
+}
+
+func extensionMarshalJSON(so interface{}, extensions []extension) ([]byte, error) {
+	// To append arbitrary keys to the struct we'll render into json,
+	// we're creating another struct that embeds the original one, and
+	// its extra fields:
+	//
+	// The struct will look like
+	// struct {
+	//   *swaggerCore
+	//   XGrpcGatewayFoo json.RawMessage `json:"x-grpc-gateway-foo"`
+	//   XGrpcGatewayBar json.RawMessage `json:"x-grpc-gateway-bar"`
+	// }
+	// and thus render into what we want -- the JSON of swaggerCore with the
+	// extensions appended.
+	fields := []reflect.StructField{
+		reflect.StructField{ // embedded
+			Name:      "Embedded",
+			Type:      reflect.TypeOf(so),
+			Anonymous: true,
+		},
+	}
+	for _, ext := range extensions {
+		fields = append(fields, reflect.StructField{
+			Name: fieldName(ext.key),
+			Type: reflect.TypeOf(ext.value),
+			Tag:  reflect.StructTag(fmt.Sprintf("json:\"%s\"", ext.key)),
+		})
+	}
+
+	t := reflect.StructOf(fields)
+	s := reflect.New(t).Elem()
+	s.Field(0).Set(reflect.ValueOf(so))
+	for _, ext := range extensions {
+		s.FieldByName(fieldName(ext.key)).Set(reflect.ValueOf(ext.value))
+	}
+	return json.Marshal(s.Interface())
+}
+
+// encodeSwagger converts swagger file obj to plugin.CodeGeneratorResponse_File
+func encodeSwagger(file *wrapper) (*plugin.CodeGeneratorResponse_File, error) {
+	var formatted bytes.Buffer
+	enc := json.NewEncoder(&formatted)
+	enc.SetIndent("", "  ")
+	if err := enc.Encode(*file.swagger); err != nil {
+		return nil, err
+	}
+	name := file.fileName
+	ext := filepath.Ext(name)
+	base := strings.TrimSuffix(name, ext)
+	output := fmt.Sprintf("%s.swagger.json", base)
+	return &plugin.CodeGeneratorResponse_File{
+		Name:    proto.String(output),
+		Content: proto.String(formatted.String()),
+	}, nil
+}
+
+func (g *generator) Generate(targets []*descriptor.File) ([]*plugin.CodeGeneratorResponse_File, error) {
+	var files []*plugin.CodeGeneratorResponse_File
+	if g.reg.IsAllowMerge() {
+		var mergedTarget *descriptor.File
+		// try to find proto leader
+		for _, f := range targets {
+			if proto.HasExtension(f.Options, swagger_options.E_Openapiv2Swagger) {
+				mergedTarget = f
+				break
+			}
+		}
+		// merge protos to leader
+		for _, f := range targets {
+			if mergedTarget == nil {
+				mergedTarget = f
+			} else {
+				mergedTarget.Enums = append(mergedTarget.Enums, f.Enums...)
+				mergedTarget.Messages = append(mergedTarget.Messages, f.Messages...)
+				mergedTarget.Services = append(mergedTarget.Services, f.Services...)
+			}
+		}
+
+		targets = nil
+		targets = append(targets, mergedTarget)
+	}
+
+	var swaggers []*wrapper
+	for _, file := range targets {
+		glog.V(1).Infof("Processing %s", file.GetName())
+		swagger, err := applyTemplate(param{File: file, reg: g.reg})
+		if err == errNoTargetService {
+			glog.V(1).Infof("%s: %v", file.GetName(), err)
+			continue
+		}
+		if err != nil {
+			return nil, err
+		}
+		swaggers = append(swaggers, &wrapper{
+			fileName: file.GetName(),
+			swagger:  swagger,
+		})
+	}
+
+	if g.reg.IsAllowMerge() {
+		targetSwagger := mergeTargetFile(swaggers, g.reg.GetMergeFileName())
+		f, err := encodeSwagger(targetSwagger)
+		if err != nil {
+			return nil, fmt.Errorf("failed to encode swagger for %s: %s", g.reg.GetMergeFileName(), err)
+		}
+		files = append(files, f)
+		glog.V(1).Infof("New swagger file will emit")
+	} else {
+		for _, file := range swaggers {
+			f, err := encodeSwagger(file)
+			if err != nil {
+				return nil, fmt.Errorf("failed to encode swagger for %s: %s", file.fileName, err)
+			}
+			files = append(files, f)
+			glog.V(1).Infof("New swagger file will emit")
+		}
+	}
+	return files, nil
+}
+
+//AddStreamError Adds grpc.gateway.runtime.StreamError and google.protobuf.Any to registry for stream responses
+func AddStreamError(reg *descriptor.Registry) error {
+	//load internal protos
+	any := fileDescriptorProtoForMessage(&any.Any{})
+	streamError := fileDescriptorProtoForMessage(&internal.StreamError{})
+	if err := reg.Load(&plugin.CodeGeneratorRequest{
+		ProtoFile: []*protocdescriptor.FileDescriptorProto{
+			any,
+			streamError,
+		},
+	}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func fileDescriptorProtoForMessage(msg pbdescriptor.Message) *protocdescriptor.FileDescriptorProto {
+	fdp, _ := pbdescriptor.ForMessage(msg)
+	fdp.SourceCodeInfo = &protocdescriptor.SourceCodeInfo{}
+	return fdp
+}