[gui] Add contract visualization and fetch

gui/about.go

+package main
+
+const about = `DFSS is a simple and secure way to e-sign contracts with a large number of participants, ensuring fairness and minimizing the involvement of the trusted third party (TTP).
+
+This graphical client is provided as part of the DFSS application.
+
+DFSS Team (alphabetical order):
+Loïck Bonniot, Axel Caro, Tristan Claverie, Quentin Dauchy,
+Quentin Dufour, Yann Porret and Maximilien Richer.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.`

gui/application.qrc

@@ -9,5 +9,6 @@
         <file>images/time.png</file>
         <file>images/digital_signature_pen.png</file>
         <file>signform/signform.ui</file>
+        <file>showcontract/showcontract.ui</file>
     </qresource>
 </RCC>

gui/authform/authform.ui

@@ -42,7 +42,7 @@
        <property name="minimumSize">
         <size>
          <width>0</width>
-         <height>50</height>
+         <height>100</height>
         </size>
        </property>
        <property name="maximumSize">

gui/config/config.go

@@ -35,7 +35,7 @@ func Load() {
 	viper.Set("file_ca", filepath.Join(path, viper.GetString("filename_ca")))
 	viper.Set("file_cert", filepath.Join(path, viper.GetString("filename_cert")))
 	viper.Set("file_key", filepath.Join(path, viper.GetString("filename_key")))
-	viper.Set("file_config", filepath.Join(path, viper.GetString("filename_config")) + ".json")
+	viper.Set("file_config", filepath.Join(path, viper.GetString("filename_config"))+".json")
 
 	// Fill virtual-only fields
 	viper.Set("registered", isFileValid(viper.GetString("file_key")))

gui/main.go

@@ -2,11 +2,8 @@ package main
 
 import (
 	"dfss"
-	"dfss/gui/authform"
+	"dfss/dfssp/contract"
 	"dfss/gui/config"
-	"dfss/gui/contractform"
-	"dfss/gui/signform"
-	"dfss/gui/userform"
 	"github.com/spf13/viper"
 	"github.com/visualfc/goqt/ui"
 )
@@ -14,7 +11,8 @@ import (
 type window struct {
 	*ui.QMainWindow
 
-	current widget
+	current  widget
+	contract *contract.JSON
 }
 
 type widget interface {
@@ -61,12 +59,39 @@ func main() {
 }
 
 func (w *window) addActions() {
+	newAct := ui.NewActionWithTextParent("&New", w)
+	newAct.SetShortcuts(ui.QKeySequence_New)
+	newAct.OnTriggered(w.showNewContractForm)
+
 	openAct := ui.NewActionWithTextParent("&Open", w)
 	openAct.SetShortcuts(ui.QKeySequence_Open)
 	openAct.OnTriggered(func() {
-		w.showSignForm()
+		w.showShowContract("")
 	})
-	w.MenuBar().AddAction(openAct)
+
+	fetchAct := ui.NewActionWithTextParent("&Fetch", w)
+	fetchAct.OnTriggered(w.showFetchForm)
+
+	aboutAct := ui.NewActionWithTextParent("&About", w)
+	aboutAct.OnTriggered(func() {
+		ui.QMessageBoxAbout(w, "About DFSS Client", about)
+	})
+
+	aboutQtAct := ui.NewActionWithTextParent("About &Qt", w)
+	aboutQtAct.OnTriggered(func() {
+		ui.QApplicationAboutQt()
+	})
+
+	fileMenu := w.MenuBar().AddMenuWithTitle("&File")
+	fileMenu.AddAction(newAct)
+	fileMenu.AddAction(openAct)
+	fileMenu.AddSeparator()
+	fileMenu.AddAction(fetchAct)
+
+	helpMenu := w.MenuBar().AddMenuWithTitle("&Help")
+	helpMenu.AddAction(aboutAct)
+	helpMenu.AddSeparator()
+	helpMenu.AddAction(aboutQtAct)
 }
 
 func (w *window) setScreen(wi widget) {
@@ -77,34 +102,3 @@ func (w *window) setScreen(wi widget) {
 		old.DeleteLater()
 	}
 }
-
-func (w *window) showUserForm() {
-	w.setScreen(userform.NewWidget(func(pwd string) {
-		w.showAuthForm()
-	}))
-}
-
-func (w *window) showAuthForm() {
-	w.setScreen(authform.NewWidget(func() {
-		w.showNewContractForm()
-		w.addActions()
-	}))
-}
-
-func (w *window) showNewContractForm() {
-	w.setScreen(contractform.NewWidget())
-}
-
-func (w *window) showSignForm() {
-	home := viper.GetString("home_dir")
-	filter := "Contract file (*.json);;Any (*.*)"
-	filename := ui.QFileDialogGetOpenFileNameWithParentCaptionDirFilterSelectedfilterOptions(w, "Select the contract file", home, filter, &filter, 0)
-	if filename != "" {
-		config.PasswordDialog(func(err error, pwd string) {
-			widget := signform.NewWidget(filename, pwd)
-			if widget != nil {
-				w.setScreen(widget)
-			}
-		})
-	}
-}

gui/screens.go

+package main
+
+import (
+	"dfss/dfssc/sign"
+	"dfss/gui/authform"
+	"dfss/gui/config"
+	"dfss/gui/contractform"
+	"dfss/gui/showcontract"
+	"dfss/gui/signform"
+	"dfss/gui/userform"
+	"github.com/spf13/viper"
+	"github.com/visualfc/goqt/ui"
+)
+
+func (w *window) showUserForm() {
+	w.setScreen(userform.NewWidget(func(pwd string) {
+		w.showAuthForm()
+	}))
+}
+
+func (w *window) showAuthForm() {
+	w.setScreen(authform.NewWidget(func() {
+		w.showNewContractForm()
+		w.addActions()
+	}))
+}
+
+func (w *window) showNewContractForm() {
+	w.setScreen(contractform.NewWidget())
+}
+
+func (w *window) showShowContract(filename string) {
+	if filename == "" {
+		home := viper.GetString("home_dir")
+		filter := "Contract file (*.json);;Any (*.*)"
+		filename = ui.QFileDialogGetOpenFileNameWithParentCaptionDirFilterSelectedfilterOptions(w, "Select the contract file", home, filter, &filter, 0)
+		if filename == "" {
+			return
+		}
+	}
+
+	w.contract = showcontract.Load(filename)
+	if w.contract == nil {
+		w.showMsgBox("Unable to load file", true)
+		return
+	}
+	w.setScreen(showcontract.NewWidget(w.contract, w.showSignForm))
+}
+
+func (w *window) showSignForm() {
+	config.PasswordDialog(func(err error, pwd string) {
+		widget := signform.NewWidget(w.contract, pwd)
+		if widget == nil {
+			w.showMsgBox("Unable to start the signing procedure", true)
+			return
+		}
+		w.setScreen(widget)
+	})
+}
+
+func (w *window) showFetchForm() {
+	w.current.Q().SetDisabled(true)
+	config.PasswordDialog(func(err error, pwd string) {
+		if err != nil {
+			w.current.Q().SetDisabled(false)
+			return
+		}
+
+		dialog := ui.NewInputDialog()
+		dialog.SetWindowTitle("Fetch a contract from the platform")
+		dialog.SetLabelText("Please paste the contract identifier here:")
+		dialog.Show()
+
+		dialog.OnAccepted(func() {
+			uuid := dialog.TextValue()
+			path := viper.GetString("home_dir") + uuid + ".json"
+
+			err := sign.FetchContract(pwd, uuid, path)
+
+			if err != nil {
+				w.showMsgBox(err.Error(), true)
+				return
+			}
+			w.showMsgBox("Contract stored as "+path, false)
+			w.showShowContract(path)
+		})
+
+		dialog.OnFinished(func(_ int32) {
+			w.current.Q().SetDisabled(false)
+		})
+	})
+}
+
+func (w *window) showMsgBox(content string, critical bool) {
+	m := ui.NewMessageBoxWithParent(w)
+	m.SetText(content)
+	if critical {
+		m.SetWindowTitle("Error")
+		m.SetIcon(ui.QMessageBox_Critical)
+	} else {
+		m.SetWindowTitle("Information")
+		m.SetIcon(ui.QMessageBox_Information)
+	}
+	m.Exec()
+}

gui/showcontract/showcontract.go

+package showcontract
+
+import (
+	"encoding/json"
+	"io/ioutil"
+
+	"dfss/dfssp/contract"
+	"github.com/visualfc/goqt/ui"
+)
+
+type Widget struct {
+	*ui.QWidget
+}
+
+func NewWidget(contract *contract.JSON, onSign func()) *Widget {
+	file := ui.NewFileWithName(":/showcontract/showcontract.ui")
+	loader := ui.NewUiLoader()
+	form := loader.Load(file)
+
+	fileField := ui.NewLabelFromDriver(form.FindChild("fileField"))
+	commentField := ui.NewLabelFromDriver(form.FindChild("commentField"))
+	signersField := ui.NewLabelFromDriver(form.FindChild("signersField"))
+	informationField := ui.NewLabelFromDriver(form.FindChild("informationField"))
+	signButton := ui.NewPushButtonFromDriver(form.FindChild("signButton"))
+
+	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{
+		QWidget: form,
+	}
+}
+
+func (w *Widget) Q() *ui.QWidget {
+	return w.QWidget
+}
+
+func (w *Widget) Tick() {}
+
+// Load loads a file and tries to unmarshall it into a DFSS contract
+func Load(filename string) *contract.JSON {
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil
+	}
+
+	contract := new(contract.JSON)
+	err = json.Unmarshal(data, contract)
+	if err != nil {
+		return nil
+	}
+
+	return contract
+}
+
+func getSignersString(contract *contract.JSON) string {
+	var s string
+	for i, signer := range contract.Signers {
+		if i > 0 {
+			s += ", "
+		}
+		s += signer.Email
+	}
+	return s
+}

gui/showcontract/showcontract.ui

+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ShowContract</class>
+ <widget class="QWidget" name="ShowContract">
+  <property name="enabled">
+   <bool>true</bool>
+  </property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>802</width>
+    <height>457</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="minimumSize">
+   <size>
+    <width>650</width>
+    <height>350</height>
+   </size>
+  </property>
+  <property name="windowTitle">
+   <string>Calculator Builder</string>
+  </property>
+  <layout class="QGridLayout">
+   <property name="margin">
+    <number>9</number>
+   </property>
+   <property name="spacing">
+    <number>6</number>
+   </property>
+   <item row="0" column="0">
+    <layout class="QVBoxLayout" name="verticalLayout">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="minimumSize">
+        <size>
+         <width>0</width>
+         <height>100</height>
+        </size>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>16777215</width>
+         <height>100</height>
+        </size>
+       </property>
+       <property name="text">
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;span style=&quot; font-size:20pt;&quot;&gt;Contract&lt;/span&gt;&lt;/p&gt;&lt;p&gt;The following information represents a multiparty contract. Please check it before any signature.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignCenter</set>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <layout class="QFormLayout" name="formLayout">
+       <property name="fieldGrowthPolicy">
+        <enum>QFormLayout::AllNonFixedFieldsGrow</enum>
+       </property>
+       <property name="formAlignment">
+        <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
+       </property>
+       <property name="horizontalSpacing">
+        <number>30</number>
+       </property>
+       <property name="verticalSpacing">
+        <number>10</number>
+       </property>
+       <property name="leftMargin">
+        <number>50</number>
+       </property>
+       <property name="rightMargin">
+        <number>50</number>
+       </property>
+       <item row="0" column="0">
+        <widget class="QLabel" name="fileLabel">
+         <property name="text">
+          <string>Contract file</string>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <layout class="QHBoxLayout" name="horizontalLayout">
+         <item>
+          <widget class="QLabel" name="fileField">
+           <property name="font">
+            <font>
+             <weight>75</weight>
+             <bold>true</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string/>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QToolButton" name="fileButton">
+           <property name="enabled">
+            <bool>false</bool>
+           </property>
+           <property name="text">
+            <string>Check with local</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item row="1" column="0">
+        <widget class="QLabel" name="signersLabel">
+         <property name="text">
+          <string>Signers</string>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="1">
+        <widget class="QLabel" name="signersField">
+         <property name="minimumSize">
+          <size>
+           <width>0</width>
+           <height>50</height>
+          </size>
+         </property>
+         <property name="font">
+          <font>
+           <weight>50</weight>
+           <bold>false</bold>
+          </font>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::Box</enum>
+         </property>
+         <property name="text">
+          <string/>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="commentLabel">
+         <property name="text">
+          <string>Comment</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="1">
+        <widget class="QLabel" name="commentField">
+         <property name="minimumSize">
+          <size>
+           <width>0</width>
+           <height>50</height>
+          </size>
+         </property>
+         <property name="font">
+          <font>
+           <italic>true</italic>
+          </font>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::Box</enum>
+         </property>
+         <property name="text">
+          <string/>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+         </property>
+        </widget>
+       </item>
+       <item row="3" column="1">
+        <widget class="QLabel" name="informationField">
+         <property name="text">
+          <string/>
+         </property>
+        </widget>
+       </item>
+       <item row="3" column="0">
+        <spacer name="horizontalSpacer">
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </item>
+    </layout>
+   </item>
+   <item row="1" column="0">
+    <widget class="QPushButton" name="signButton">
+     <property name="text">
+      <string>Sign now</string>
+     </property>
+     <property name="default">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

gui/signform/signform.go

 package signform
 
 import (
-	"encoding/json"
-	"io/ioutil"
-
 	"dfss/dfssc/sign"
 	"dfss/dfssp/contract"
 	"github.com/spf13/viper"
@@ -29,34 +26,26 @@ type Widget struct {
 	feedback                 string
 }
 
-func NewWidget(filename, pwd string) *Widget {
+func NewWidget(contract *contract.JSON, pwd string) *Widget {
 	loadIcons()
 	file := ui.NewFileWithName(":/signform/signform.ui")
 	loader := ui.NewUiLoader()
 	form := loader.Load(file)
-	w := &Widget{QWidget: form}
+	w := &Widget{
+		QWidget:  form,
+		contract: contract,
+	}
 
 	w.feedbackLabel = ui.NewLabelFromDriver(w.FindChild("mainLabel"))
 	w.table = ui.NewTableWidgetFromDriver(w.FindChild("signersTable"))
 	w.progressBar = ui.NewProgressBarFromDriver(w.FindChild("progressBar"))
 
-	data, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return nil
-	}
-
-	w.contract = new(contract.JSON)
-	err = json.Unmarshal(data, w.contract)
-	if err != nil {
-		return nil
-	}
-
 	m, err := sign.NewSignatureManager(
 		pwd,
 		w.contract,
 	)
 	if err != nil {
-		// TODO
+		return nil
 	}
 
 	w.manager = m