[gui] Add check local file feature

gui/showcontract/showcontract.go

@@ -5,12 +5,17 @@ import (
 	"io/ioutil"
 
 	"dfss/dfssc/common"
+	"dfss/dfssc/sign"
 	"dfss/dfssp/contract"
+	dialog "dfss/gui/common"
+	"github.com/spf13/viper"
 	"github.com/visualfc/goqt/ui"
 )
 
 type Widget struct {
 	*ui.QWidget
+
+	checked bool
 }
 
 func NewWidget(contract *contract.JSON, onSign func()) *Widget {
@@ -23,17 +28,59 @@ func NewWidget(contract *contract.JSON, onSign func()) *Widget {
 	signersField := ui.NewLabelFromDriver(form.FindChild("signersField"))
 	informationField := ui.NewLabelFromDriver(form.FindChild("informationField"))
 	signButton := ui.NewPushButtonFromDriver(form.FindChild("signButton"))
+	fileButton := ui.NewPushButtonFromDriver(form.FindChild("fileButton"))
 
 	fileField.SetText(contract.File.Name)
 	commentField.SetText(contract.Comment)
 	signersField.SetText(getSignersString(contract))
 	informationField.SetText("Contract #" + contract.UUID + "\nCreated on " + contract.Date.Format("2006-01-02 15:04:05 MST") + ".")
 
-	signButton.OnClicked(onSign)
-
-	return &Widget{
+	w := &Widget{
 		QWidget: form,
+		checked: false,
 	}
+
+	fileButton.OnClicked(func() {
+		home := viper.GetString("home_dir")
+		filter := "Any (*.*)"
+		filename := ui.QFileDialogGetOpenFileNameWithParentCaptionDirFilterSelectedfilterOptions(nil, "Select the local contract to compare to "+contract.File.Name, home, filter, &filter, 0)
+		if filename == "" {
+			return
+		}
+
+		ok, err := sign.CheckContractHash(filename, contract.File.Hash)
+		if err != nil {
+			dialog.ShowMsgBox(err.Error(), true)
+		} else if !ok {
+			dialog.ShowMsgBox("The provided file is not the one hashed during contract creation, beware!", true)
+		} else {
+			dialog.ShowMsgBox("The provided file is correct for this contract!", false)
+			w.checked = true
+		}
+	})
+
+	signButton.OnClicked(func() {
+		if !w.checked { // If the contract file has not been checked locally
+			box := ui.NewMessageBox()
+			box.SetWindowTitle("Warning")
+			box.SetText("Do you want to check your local contract file before signing this DFSS contract?")
+			box.SetIcon(ui.QMessageBox_Question)
+			box.AddButton(ui.QMessageBox_Yes)
+			box.AddButton(ui.QMessageBox_No)
+			box.OnButtonClicked(func(b *ui.QAbstractButton) {
+				if box.ButtonRole(b) == ui.QMessageBox_YesRole {
+					fileButton.Click()
+				} else {
+					onSign()
+				}
+			})
+			box.Show()
+		} else {
+			onSign()
+		}
+	})
+
+	return w
 }
 
 func (w *Widget) Q() *ui.QWidget {

gui/showcontract/showcontract.ui

@@ -106,9 +106,6 @@
          </item>
          <item>
           <widget class="QToolButton" name="fileButton">
-           <property name="enabled">
-            <bool>false</bool>
-           </property>
            <property name="text">
             <string>Check with local</string>
            </property>