implemented last modified

internal/dataloader.go

@@ -78,6 +78,7 @@ func getFilesBatch(c context.Context, k dataloader.Keys) []*dataloader.Result {
 					Size:         obj.Size,
 					ContentType:  obj.ContentType,
 					ETag:         obj.ETag,
+					LastModified: obj.LastModified,
 				})
 			}
 		}
@@ -116,6 +117,7 @@ func getFileBatch(c context.Context, k dataloader.Keys) []*dataloader.Result {
 					Size:         obj.Size,
 					ContentType:  obj.ContentType,
 					ETag:         obj.ETag,
+					LastModified: obj.LastModified,
 				},
 				Error: nil,
 			})

internal/graphqlTypes.go

@@ -4,9 +4,11 @@ import (
 	"fmt"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/graph-gophers/dataloader"
 	"github.com/graphql-go/graphql"
+	"github.com/graphql-go/graphql/language/ast"
 )
 
 var graphqlDirType *graphql.Object
@@ -14,6 +16,38 @@ var graphqlFileType *graphql.Object
 
 // graphqlTypes create all graphql types and stores the in the global variables
 func graphqlTypes() {
+
+	var dateTimeType = graphql.NewScalar(graphql.ScalarConfig{
+		Name:        "DateTime",
+		Description: "DateTime is a DateTime in ISO 8601 format",
+		Serialize: func(value interface{}) interface{} {
+			switch value := value.(type) {
+			case time.Time:
+				return value.Format(time.RFC3339)
+			}
+
+			return "INVALID"
+		},
+		ParseValue: func(value interface{}) interface{} {
+			switch tvalue := value.(type) {
+			case string:
+				if tval, err := time.Parse(time.RFC3339, tvalue); err != nil {
+					return nil
+				} else {
+					return tval
+				}
+			}
+			return nil
+		},
+		ParseLiteral: func(valueAST ast.Value) interface{} {
+			switch valueAST := valueAST.(type) {
+			case *ast.StringValue:
+				return valueAST.Value
+			}
+			return nil
+		},
+	})
+
 	graphqlDirType = graphql.NewObject(graphql.ObjectConfig{
 		Name:        "Directory",
 		Description: "Represents a directory",
@@ -87,6 +121,17 @@ func graphqlTypes() {
 					return file.ETag, nil
 				},
 			},
+			"lastModified": &graphql.Field{
+				Type: dateTimeType,
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					file, err := loadFile(p)
+					if err != nil {
+						return nil, err
+					}
+
+					return file.LastModified, nil
+				},
+			},
 			"parent": &graphql.Field{
 				Type: graphqlDirType,
 				Resolve: func(p graphql.ResolveParams) (interface{}, error) {

internal/s3Broswer.go

@@ -27,6 +27,7 @@ type File struct {
 	Size         int64     `json:"size"`
 	ContentType  string    `json:"contentType"`
 	ETag         string    `json:"etag"`
+	LastModified time.Time `json:"lastModified"`
 }
 
 // Directory represents a directory with its metadata