Added endpoint to list files.

api/api.swagger.json

@@ -430,6 +430,42 @@
         ]
       }
     },
+    "/apis/v1beta1/{namespace}/workflow_executions/{name}/files/{path}": {
+      "get": {
+        "operationId": "ListFiles",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/ListFilesResponse"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "namespace",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "path",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "tags": [
+          "WorkflowService"
+        ]
+      }
+    },
     "/apis/v1beta1/{namespace}/workflow_executions/{name}/pods/{podName}/containers/{containerName}/logs": {
       "get": {
         "operationId": "GetWorkflowExecutionLogs",
@@ -915,6 +951,31 @@
         }
       }
     },
+    "File": {
+      "type": "object",
+      "properties": {
+        "path": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        },
+        "size": {
+          "type": "string",
+          "format": "int64"
+        },
+        "contentType": {
+          "type": "string"
+        },
+        "lastModified": {
+          "type": "string"
+        },
+        "directory": {
+          "type": "boolean",
+          "format": "boolean"
+        }
+      }
+    },
     "GetWorkflowExecutionMetricsResponse": {
       "type": "object",
       "properties": {
@@ -926,6 +987,17 @@
         }
       }
     },
+    "ListFilesResponse": {
+      "type": "object",
+      "properties": {
+        "files": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/File"
+          }
+        }
+      }
+    },
     "ListNamespacesResponse": {
       "type": "object",
       "properties": {

api/workflow.pb.go

@@ -852,6 +852,179 @@ func (m *ArtifactResponse) GetData() []byte {
 	return nil
 }
 
+type File struct {
+	Path                 string   `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
+	Name                 string   `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	Size                 int64    `protobuf:"varint,3,opt,name=size,proto3" json:"size,omitempty"`
+	ContentType          string   `protobuf:"bytes,4,opt,name=contentType,proto3" json:"contentType,omitempty"`
+	LastModified         string   `protobuf:"bytes,5,opt,name=lastModified,proto3" json:"lastModified,omitempty"`
+	Directory            bool     `protobuf:"varint,6,opt,name=directory,proto3" json:"directory,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *File) Reset()         { *m = File{} }
+func (m *File) String() string { return proto.CompactTextString(m) }
+func (*File) ProtoMessage()    {}
+func (*File) Descriptor() ([]byte, []int) {
+	return fileDescriptor_892c7f566756b0be, []int{15}
+}
+
+func (m *File) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_File.Unmarshal(m, b)
+}
+func (m *File) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_File.Marshal(b, m, deterministic)
+}
+func (m *File) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_File.Merge(m, src)
+}
+func (m *File) XXX_Size() int {
+	return xxx_messageInfo_File.Size(m)
+}
+func (m *File) XXX_DiscardUnknown() {
+	xxx_messageInfo_File.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_File proto.InternalMessageInfo
+
+func (m *File) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+func (m *File) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *File) GetSize() int64 {
+	if m != nil {
+		return m.Size
+	}
+	return 0
+}
+
+func (m *File) GetContentType() string {
+	if m != nil {
+		return m.ContentType
+	}
+	return ""
+}
+
+func (m *File) GetLastModified() string {
+	if m != nil {
+		return m.LastModified
+	}
+	return ""
+}
+
+func (m *File) GetDirectory() bool {
+	if m != nil {
+		return m.Directory
+	}
+	return false
+}
+
+type ListFilesRequest struct {
+	Namespace            string   `protobuf:"bytes,1,opt,name=namespace,proto3" json:"namespace,omitempty"`
+	Name                 string   `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	Path                 string   `protobuf:"bytes,3,opt,name=path,proto3" json:"path,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ListFilesRequest) Reset()         { *m = ListFilesRequest{} }
+func (m *ListFilesRequest) String() string { return proto.CompactTextString(m) }
+func (*ListFilesRequest) ProtoMessage()    {}
+func (*ListFilesRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_892c7f566756b0be, []int{16}
+}
+
+func (m *ListFilesRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListFilesRequest.Unmarshal(m, b)
+}
+func (m *ListFilesRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListFilesRequest.Marshal(b, m, deterministic)
+}
+func (m *ListFilesRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListFilesRequest.Merge(m, src)
+}
+func (m *ListFilesRequest) XXX_Size() int {
+	return xxx_messageInfo_ListFilesRequest.Size(m)
+}
+func (m *ListFilesRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListFilesRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListFilesRequest proto.InternalMessageInfo
+
+func (m *ListFilesRequest) GetNamespace() string {
+	if m != nil {
+		return m.Namespace
+	}
+	return ""
+}
+
+func (m *ListFilesRequest) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *ListFilesRequest) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+type ListFilesResponse struct {
+	Files                []*File  `protobuf:"bytes,1,rep,name=files,proto3" json:"files,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ListFilesResponse) Reset()         { *m = ListFilesResponse{} }
+func (m *ListFilesResponse) String() string { return proto.CompactTextString(m) }
+func (*ListFilesResponse) ProtoMessage()    {}
+func (*ListFilesResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_892c7f566756b0be, []int{17}
+}
+
+func (m *ListFilesResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListFilesResponse.Unmarshal(m, b)
+}
+func (m *ListFilesResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListFilesResponse.Marshal(b, m, deterministic)
+}
+func (m *ListFilesResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListFilesResponse.Merge(m, src)
+}
+func (m *ListFilesResponse) XXX_Size() int {
+	return xxx_messageInfo_ListFilesResponse.Size(m)
+}
+func (m *ListFilesResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListFilesResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListFilesResponse proto.InternalMessageInfo
+
+func (m *ListFilesResponse) GetFiles() []*File {
+	if m != nil {
+		return m.Files
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*CreateWorkflowExecutionRequest)(nil), "api.CreateWorkflowExecutionRequest")
 	proto.RegisterType((*GetWorkflowExecutionRequest)(nil), "api.GetWorkflowExecutionRequest")
@@ -868,98 +1041,111 @@ func init() {
 	proto.RegisterType((*WorkflowExecution)(nil), "api.WorkflowExecution")
 	proto.RegisterType((*WorkflowExecutionParameter)(nil), "api.WorkflowExecutionParameter")
 	proto.RegisterType((*ArtifactResponse)(nil), "api.ArtifactResponse")
+	proto.RegisterType((*File)(nil), "api.File")
+	proto.RegisterType((*ListFilesRequest)(nil), "api.ListFilesRequest")
+	proto.RegisterType((*ListFilesResponse)(nil), "api.ListFilesResponse")
 }
 
 func init() { proto.RegisterFile("workflow.proto", fileDescriptor_892c7f566756b0be) }
 
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+	0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -991,6 +1177,7 @@ type WorkflowServiceClient interface {
 	ListWorkflowTemplates(ctx context.Context, in *ListWorkflowTemplatesRequest, opts ...grpc.CallOption) (*ListWorkflowTemplatesResponse, error)
 	ArchiveWorkflowTemplate(ctx context.Context, in *ArchiveWorkflowTemplateRequest, opts ...grpc.CallOption) (*ArchiveWorkflowTemplateResponse, error)
 	GetArtifact(ctx context.Context, in *GetArtifactRequest, opts ...grpc.CallOption) (*ArtifactResponse, error)
+	ListFiles(ctx context.Context, in *ListFilesRequest, opts ...grpc.CallOption) (*ListFilesResponse, error)
 }
 
 type workflowServiceClient struct {
@@ -1191,6 +1378,15 @@ func (c *workflowServiceClient) GetArtifact(ctx context.Context, in *GetArtifact
 	return out, nil
 }
 
+func (c *workflowServiceClient) ListFiles(ctx context.Context, in *ListFilesRequest, opts ...grpc.CallOption) (*ListFilesResponse, error) {
+	out := new(ListFilesResponse)
+	err := c.cc.Invoke(ctx, "/api.WorkflowService/ListFiles", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // WorkflowServiceServer is the server API for WorkflowService service.
 type WorkflowServiceServer interface {
 	// Creates a Workflow
@@ -1210,6 +1406,7 @@ type WorkflowServiceServer interface {
 	ListWorkflowTemplates(context.Context, *ListWorkflowTemplatesRequest) (*ListWorkflowTemplatesResponse, error)
 	ArchiveWorkflowTemplate(context.Context, *ArchiveWorkflowTemplateRequest) (*ArchiveWorkflowTemplateResponse, error)
 	GetArtifact(context.Context, *GetArtifactRequest) (*ArtifactResponse, error)
+	ListFiles(context.Context, *ListFilesRequest) (*ListFilesResponse, error)
 }
 
 // UnimplementedWorkflowServiceServer can be embedded to have forward compatible implementations.
@@ -1264,6 +1461,9 @@ func (*UnimplementedWorkflowServiceServer) ArchiveWorkflowTemplate(ctx context.C
 func (*UnimplementedWorkflowServiceServer) GetArtifact(ctx context.Context, req *GetArtifactRequest) (*ArtifactResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetArtifact not implemented")
 }
+func (*UnimplementedWorkflowServiceServer) ListFiles(ctx context.Context, req *ListFilesRequest) (*ListFilesResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ListFiles not implemented")
+}
 
 func RegisterWorkflowServiceServer(s *grpc.Server, srv WorkflowServiceServer) {
 	s.RegisterService(&_WorkflowService_serviceDesc, srv)
@@ -1563,6 +1763,24 @@ func _WorkflowService_GetArtifact_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _WorkflowService_ListFiles_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListFilesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(WorkflowServiceServer).ListFiles(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/api.WorkflowService/ListFiles",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(WorkflowServiceServer).ListFiles(ctx, req.(*ListFilesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _WorkflowService_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "api.WorkflowService",
 	HandlerType: (*WorkflowServiceServer)(nil),
@@ -1623,6 +1841,10 @@ var _WorkflowService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "GetArtifact",
 			Handler:    _WorkflowService_GetArtifact_Handler,
 		},
+		{
+			MethodName: "ListFiles",
+			Handler:    _WorkflowService_ListFiles_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

api/workflow.pb.gw.go

@@ -1379,6 +1379,104 @@ func local_request_WorkflowService_GetArtifact_0(ctx context.Context, marshaler
 
 }
 
+func request_WorkflowService_ListFiles_0(ctx context.Context, marshaler runtime.Marshaler, client WorkflowServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ListFilesRequest
+	var metadata runtime.ServerMetadata
+
+	var (
+		val string
+		ok  bool
+		err error
+		_   = err
+	)
+
+	val, ok = pathParams["namespace"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "namespace")
+	}
+
+	protoReq.Namespace, err = runtime.String(val)
+
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "namespace", err)
+	}
+
+	val, ok = pathParams["name"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "name")
+	}
+
+	protoReq.Name, err = runtime.String(val)
+
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "name", err)
+	}
+
+	val, ok = pathParams["path"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "path")
+	}
+
+	protoReq.Path, err = runtime.String(val)
+
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "path", err)
+	}
+
+	msg, err := client.ListFiles(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_WorkflowService_ListFiles_0(ctx context.Context, marshaler runtime.Marshaler, server WorkflowServiceServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ListFilesRequest
+	var metadata runtime.ServerMetadata
+
+	var (
+		val string
+		ok  bool
+		err error
+		_   = err
+	)
+
+	val, ok = pathParams["namespace"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "namespace")
+	}
+
+	protoReq.Namespace, err = runtime.String(val)
+
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "namespace", err)
+	}
+
+	val, ok = pathParams["name"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "name")
+	}
+
+	protoReq.Name, err = runtime.String(val)
+
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "name", err)
+	}
+
+	val, ok = pathParams["path"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "path")
+	}
+
+	protoReq.Path, err = runtime.String(val)
+
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "path", err)
+	}
+
+	msg, err := server.ListFiles(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
 // RegisterWorkflowServiceHandlerServer registers the http handlers for service WorkflowService to "mux".
 // UnaryRPC     :call WorkflowServiceServer directly.
 // StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
@@ -1698,6 +1796,26 @@ func RegisterWorkflowServiceHandlerServer(ctx context.Context, mux *runtime.Serv
 
 	})
 
+	mux.Handle("GET", pattern_WorkflowService_ListFiles_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateIncomingContext(ctx, mux, req)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_WorkflowService_ListFiles_0(rctx, inboundMarshaler, server, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_WorkflowService_ListFiles_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
@@ -2079,6 +2197,26 @@ func RegisterWorkflowServiceHandlerClient(ctx context.Context, mux *runtime.Serv
 
 	})
 
+	mux.Handle("GET", pattern_WorkflowService_ListFiles_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, mux, req)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_WorkflowService_ListFiles_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_WorkflowService_ListFiles_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
@@ -2116,6 +2254,8 @@ var (
 	pattern_WorkflowService_ArchiveWorkflowTemplate_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 1, 0, 4, 1, 5, 2, 2, 3, 1, 0, 4, 1, 5, 4, 2, 5}, []string{"apis", "v1beta1", "namespace", "workflow_templates", "uid", "archive"}, "", runtime.AssumeColonVerbOpt(true)))
 
 	pattern_WorkflowService_GetArtifact_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 1, 0, 4, 1, 5, 2, 2, 3, 1, 0, 4, 1, 5, 4, 2, 5, 3, 0, 4, 1, 5, 6}, []string{"apis", "v1beta1", "namespace", "workflow_executions", "name", "artifacts", "key"}, "", runtime.AssumeColonVerbOpt(true)))
+
+	pattern_WorkflowService_ListFiles_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 1, 0, 4, 1, 5, 2, 2, 3, 1, 0, 4, 1, 5, 4, 2, 5, 3, 0, 4, 1, 5, 6}, []string{"apis", "v1beta1", "namespace", "workflow_executions", "name", "files", "path"}, "", runtime.AssumeColonVerbOpt(true)))
 )
 
 var (
@@ -2152,4 +2292,6 @@ var (
 	forward_WorkflowService_ArchiveWorkflowTemplate_0 = runtime.ForwardResponseMessage
 
 	forward_WorkflowService_GetArtifact_0 = runtime.ForwardResponseMessage
+
+	forward_WorkflowService_ListFiles_0 = runtime.ForwardResponseMessage
 )

api/workflow.proto

@@ -137,6 +137,12 @@ service WorkflowService {
             get: "/apis/v1beta1/{namespace}/workflow_executions/{name}/artifacts/{key=**}"
         };
     }
+
+    rpc ListFiles (ListFilesRequest) returns (ListFilesResponse) {
+        option (google.api.http) = {
+            get: "/apis/v1beta1/{namespace}/workflow_executions/{name}/files/{path=**}"
+        };
+    }
 }
 
 message CreateWorkflowExecutionRequest {    
@@ -230,3 +236,22 @@ message WorkflowExecutionParameter {
 message ArtifactResponse {
     bytes data = 1;
 }
+
+message File {
+    string path = 1;
+    string name = 2;
+    int64 size = 3;
+    string contentType = 4;
+    string lastModified = 5;
+    bool directory = 6;
+}
+
+message ListFilesRequest {
+    string namespace = 1;
+    string name = 2;
+    string path = 3;
+}
+
+message ListFilesResponse {
+    repeated File files = 1;
+}

pkg/types.go

@@ -1,6 +1,7 @@
 package v1
 
 import (
+	"strings"
 	"time"
 
 	wfv1 "github.com/argoproj/argo/pkg/apis/workflow/v1alpha1"
@@ -103,3 +104,25 @@ type WorkflowExecutionOptions struct {
 	ListOptions    *ListOptions
 	PodGCStrategy  *PodGCStrategy
 }
+
+type File struct {
+	Path         string
+	Name         string
+	Size         int64
+	ContentType  string
+	LastModified time.Time
+	Directory    bool
+}
+
+func FilePathToName(path string) string {
+	if strings.HasSuffix(path, "/") {
+		path = path[:len(path)-1]
+	}
+
+	lastSlashIndex := strings.LastIndex(path, "/")
+	if lastSlashIndex < 0 {
+		return path
+	}
+
+	return path[lastSlashIndex+1:]
+}

pkg/workflow_execution.go

@@ -722,3 +722,42 @@ func (c *Client) GetArtifact(namespace, name, key string) (data []byte, err erro
 
 	return
 }
+
+func (c *Client) ListFiles(namespace, name, key string) (files []*File, err error) {
+	// @todo the key should be relative to the namespace/name combo
+	// @todo pagination, limit, etc.
+
+	config, err := c.GetNamespaceConfig(namespace)
+	if err != nil {
+		return
+	}
+
+	s3Client, err := c.GetS3Client(namespace, config)
+	if err != nil {
+		return
+	}
+
+	files = make([]*File, 0)
+
+	if len(key) > 0 {
+		if string(key[len(key)-1]) != "/" {
+			key += "/"
+		}
+	}
+
+	doneCh := make(chan struct{})
+	defer close(doneCh)
+	for objInfo := range s3Client.ListObjectsV2(config[artifactRepositoryBucketKey], key, false, doneCh) {
+		newFile := &File{
+			Path:         objInfo.Key,
+			Name:         FilePathToName(objInfo.Key),
+			Size:         objInfo.Size,
+			LastModified: objInfo.LastModified,
+			ContentType:  objInfo.ContentType,
+			Directory:    objInfo.ETag == "" && objInfo.Size == 0,
+		}
+		files = append(files, newFile)
+	}
+
+	return
+}

server/workflow_server.go

@@ -430,3 +430,31 @@ func (s *WorkflowServer) GetArtifact(ctx context.Context, req *api.GetArtifactRe
 		Data: data,
 	}, nil
 }
+
+func (s *WorkflowServer) ListFiles(ctx context.Context, req *api.ListFilesRequest) (*api.ListFilesResponse, error) {
+	client := ctx.Value("kubeClient").(*v1.Client)
+	allowed, err := auth.IsAuthorized(client, req.Namespace, "get", "argoproj.io", "workflows", req.Name)
+	if err != nil || !allowed {
+		return nil, err
+	}
+
+	files, err := client.ListFiles(req.Namespace, req.Name, req.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	apiFiles := make([]*api.File, len(files))
+	for i, file := range files {
+		apiFiles[i] = &api.File{
+			Path:         file.Path,
+			Name:         file.Name,
+			Size:         file.Size,
+			ContentType:  file.ContentType,
+			LastModified: file.LastModified.UTC().Format(time.RFC3339),
+		}
+	}
+
+	return &api.ListFilesResponse{
+		Files: apiFiles,
+	}, nil
+}