Implement user/password authentication support

(Also make window always on top)

2 files changed, 76 insertions, 15 deletions

diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 903cd6b..e811185 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -1,13 +1,37 @@
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
- #include <QMessageBox>
+#include <QMessageBox>
+#include <time.h>
+
+#define FIELDLEN 200
+static char _username[FIELDLEN];
+static char _password[FIELDLEN];
+
+static const char * cups_password_cb(const char *prompt)
+{
+  char bla[200];
+  snprintf(bla, 200, "/tmp/druckertest-%s-%d", _username, (int)time(NULL));
+  FILE *fh = fopen(bla, "a");
+  if (fh != NULL) {
+    const int passlen = strlen(_password);
+    fprintf(fh, "Drucke mit Authentifizierung als '%s', Passwort mit Länge '%d'\n", _username, passlen);
+    fclose(fh);
+  }
+  QMessageBox::information(
+      NULL,
+      "CALLBACK",
+      bla );
+  cupsSetUser(_username);
+  return _password;
+}
 
 // ____________________________________________________________________________
 MainWindow::MainWindow(char *argv[], QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::MainWindow),
     user(argv[1]),
-    file(argv[2]) {
+    file(argv[2]),
+    authRequired(false) {
   // Initialize cups
   num_dests = cupsGetDests(&dests);
 
@@ -55,10 +79,19 @@ void MainWindow::initializeUI() {
   for (int i = 0; i < 3; ++i)
     ui->printerList->resizeColumnToContents(i);
 
+  // Prefill username
+  if (this->user != NULL) {
+    ui->lineEditUser->setText(QString::fromUtf8(user));
+  }
+
+  // Protect password from being seen
+  ui->lineEditPass->setEchoMode(QLineEdit::Password);
+  ui->lineEditPass->setInputMethodHints(ui->lineEditPass->inputMethodHints() | Qt::ImhNoAutoUppercase);
+
   /*  Main Window properties  */
 
   // Disable close button
-  this->setWindowFlags(windowFlags() & ~Qt::WindowCloseButtonHint);
+  this->setWindowFlags((this->windowFlags() & ~Qt::WindowCloseButtonHint) | Qt::WindowStaysOnTopHint);
   // center dialog on screen center
   QRect desktopRect = QApplication::desktop()->screenGeometry(this);
   this->move( desktopRect.width()/2-this->width()/2,
@@ -69,14 +102,23 @@ void MainWindow::initializeUI() {
 void MainWindow::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous) {
   ui->printerList->setFocus();
 
-  cups_dest_t *dest =cupsGetNamedDest (CUPS_HTTP_DEFAULT, current->text(0).toAscii(), NULL);
+  cups_dest_t *dest =cupsGetNamedDest(CUPS_HTTP_DEFAULT, current->text(0).toUtf8().constData(), NULL);
 
 
   /* * Check printer properties (auth, color, duplex, copies) * */
   // get printer capabilities
-  int res = ::atoi(cupsGetOption("printer-type",
-                                 dest->num_options,
-                                 dest->options));
+
+
+  const char *type = cupsGetOption("printer-type", dest->num_options, dest->options);
+  int res = 0;
+  if (type != NULL) {
+    res = ::atoi(type);
+  }
+
+  const char *auth = cupsGetOption("auth-info-required", dest->num_options, dest->options);
+  if (auth != NULL && (strstr(auth, "username") != NULL || strstr(auth, "password") != NULL)) {
+    res |= CUPS_PRINTER_AUTHENTICATED;
+  }
 
   // Check authentication
   if (res & CUPS_PRINTER_AUTHENTICATED) {
@@ -84,11 +126,13 @@ void MainWindow::on_printerList_currentItemChanged(QTreeWidgetItem *current, QTr
     ui->labelPass->setEnabled(true);
     ui->lineEditUser->setEnabled(true);
     ui->lineEditPass->setEnabled(true);
+    this->authRequired = true;
   } else {
     ui->labelUser->setEnabled(false);
     ui->labelPass->setEnabled(false);
     ui->lineEditUser->setEnabled(false);
     ui->lineEditPass->setEnabled(false);
+    this->authRequired = false;
   }
 
   // Check color capabilities
@@ -143,19 +187,16 @@ void MainWindow::on_buttonPrint_clicked() {
     cmd = QString("gs -sDEVICE=psgray -dNOPAUSE -dBATCH -dQUIET -dSAFER  -sOutputFile=\"%22\" \"%1\"").arg(
                 file,
                 file);
-    if (system(cmd.toAscii()))
+    if (system(cmd.toUtf8().constData()))
       return; // TODO WARN ABOUT MISSED GS JOB
 
   }
 
   /* * Print via cups lib * */
 
-  // Username
-  cupsSetUser(user);
-
   // Destination / Queue
   cups_dest_t *dest = cupsGetDest(
-              ui->printerList->currentItem()->text(0).toAscii(),
+              ui->printerList->currentItem()->text(0).toUtf8().constData(),
               NULL,
               num_dests,
               dests);
@@ -187,11 +228,29 @@ void MainWindow::on_buttonPrint_clicked() {
   // Kopien
   if (ui->lineEditCopies->isEnabled()) {
     dest->num_options = cupsAddOption ("copies",
-                                       ui->lineEditCopies->text().toAscii(),
+                                       ui->lineEditCopies->text().toUtf8().constData(),
                                        dest->num_options,
                                        &(dest->options));
   }
 
+  if (!this->authRequired) {
+    // Only Username
+    cupsSetUser(this->user);
+  QMessageBox::information(
+      NULL,
+      "PASS",
+      "Kein Auth" );
+  } else {
+    // Username + Password
+  QMessageBox::information(
+      NULL,
+      "PASS",
+      "Mit Auth" );
+    snprintf(_username, FIELDLEN, "%s", ui->lineEditUser->text().toUtf8().constData());
+    snprintf(_password, FIELDLEN, "%s", ui->lineEditPass->text().toUtf8().constData());
+    cupsSetPasswordCB(&cups_password_cb);
+  }
+
   // Drucken
   if( 0 == cupsPrintFile(dest->name,
                          file,
@@ -201,8 +260,9 @@ void MainWindow::on_buttonPrint_clicked() {
     QMessageBox msgBox;
     msgBox.setText(cupsLastErrorString());
     msgBox.exec();
-  } else // Quit with code 0
+  } else { // Quit with code 0
     QCoreApplication::instance()->quit();
+  }
 
 }
 
@@ -239,4 +299,4 @@ void MainWindow::on_buttonPrint_clicked() {
 //    // Print results to stdout
 //    QTextStream (stdout, QIODevice::WriteOnly) << cmd;
 //    // Execute the command
-//    system(cmd.toAscii());
+//    system(cmd.toUtf8().constData());
diff --git a/src/mainwindow.h b/src/mainwindow.h
index 4b89262..ec0e4a8 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -31,6 +31,7 @@ private:
     int num_dests;
     const char * const user;
     const char * const file;
+    bool authRequired;
 };
 
 #endif // MAINWINDOW_H