[taler-taler-mdb] 44/93: prepare logic for generation of QR codes

[gnunet]

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marco-boss pushed a commit to branch master
in repository taler-mdb.

commit f8ab6b7b487e0cb7eac2d91147ddfb52d44ea92d
Author: Christian Grothoff <address@hidden>
AuthorDate: Sun Nov 10 23:18:29 2019 +0100

    prepare logic for generation of QR codes
---
 configure.ac    |  39 ++++++++++++++++++++-
 src/Makefile.am |   1 +
 src/main.c      | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 140 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4d075d6..7dd8013 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,7 +14,7 @@ AC_PROG_CC
 AC_CHECK_LIB([nfc], [nfc_open])
 
 # Checks for header files.
-AC_CHECK_HEADERS([stdlib.h string.h unistd.h])
+AC_CHECK_HEADERS([stdlib.h string.h unistd.h sys/un.h netinet/in.h 
netinet/ip.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_CHECK_HEADER_STDBOOL
@@ -72,6 +72,38 @@ AC_CHECK_FUNCS([strstr])
 LIBS_SAVE=$LIBS
 
 
+# test for libqrencode
+qrencode=0
+QR_LIBS="-lqrencode"
+AC_MSG_CHECKING(for libqrencode)
+AC_ARG_WITH(qrencode,
+   [  --with-qrencode=PFX    Base of libqrencode installation],
+   [AC_MSG_RESULT([$with_qrencode])
+    AS_CASE([$with_qrencode],
+      [no],[],
+      [yes],[
+        AC_CHECK_HEADERS(qrencode.h,qrencode=1)
+      ],
+      [
+        CPPFLAGS="-I$with_qrencode/include $CPPFLAGS"
+        QR_CFLAGS="-I$with_qrencode/include"
+        QR_LIBS="-L$with_qrencode/lib -lqrencode"
+        AC_CHECK_HEADERS(qrencode.h,qrencode=1)
+      ])
+   ],
+   [AC_MSG_RESULT([--with-qrencode not specified])
+    AC_CHECK_HEADERS(qrencode.h,qrencode=1)])
+
+AS_IF([test "$qrencode" != 1],
+[
+QR_LIBS=""
+QR_CFLAGS=""
+])
+
+AC_SUBST(QR_CFLAGS)
+AC_SUBST(QR_LIBS)
+
+
 # Check for Taler's libtalermerchant
 libtalermerchant=0
 AC_MSG_CHECKING([for libtalermerchant])
@@ -248,3 +280,8 @@ LIBS=$LIBS_SAVE
 AC_CONFIG_FILES([Makefile
                  src/Makefile])
 AC_OUTPUT
+
+if test "$qrencode" != 1
+then
+ AC_MSG_WARN([taler-mdb will not include QR support])
+fi
diff --git a/src/Makefile.am b/src/Makefile.am
index 27eedc2..2feee4f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,6 +15,7 @@ taler_nfc_LDADD = \
   -lgnunetutil \
   -ljansson \
   -lnfc \
+  @QR_LIBS@ \
   $(XLIB)
 
 
diff --git a/src/main.c b/src/main.c
index e49cb6d..a34353b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -22,16 +22,34 @@ along with
 * @author BOSS Marco
 * @author Christian Grothoff
 */
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/socket.h>
+#if HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#if HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#if HAVE_NETINET_IP_H
+#include <netinet/ip.h>         /* superset of previous */
+#endif
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
 #include <termios.h>
 #include <nfc/nfc.h>
-#include <gnunet/platform.h>
 #include <gnunet/gnunet_util_lib.h>
 #include <taler/taler_merchant_service.h>
 
+/**
+ * Disable i18n support.
+ */
+#define _(s) (s)
+
 #define BACKEND_POLL_TIMEOUT GNUNET_TIME_UNIT_MINUTES
 
 #define NFC_FAILURE_RETRY_FREQ GNUNET_TIME_UNIT_SECONDS
@@ -151,6 +169,85 @@ static struct Product products[] = {
 };
 
 
+#if HAVE_QRENCODE_H
+#include <qrencode.h>
+
+/**
+ * Create the QR code image for our zone.
+ *
+ * @param uri what text to show in the QR code
+ */
+static void
+show_qrcode (const char *uri)
+{
+  QRinput *qri;
+  QRcode *qrc;
+  uint8_t *pixels;
+  unsigned int size;
+  char *upper;
+  const unsigned int scale = 3;
+  const unsigned int n_channels = 3;
+
+  qri = QRinput_new2 (0, QR_ECLEVEL_M);
+  if (NULL == qri)
+  {
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+                         "QRinput_new2");
+    return;
+  }
+  upper = GNUNET_strdup (uri);
+  GNUNET_STRINGS_utf8_toupper (uri, upper);
+  /* first try encoding as uppercase-only alpha-numerical
+     QR code (much smaller encoding); if that fails, also
+     try using binary encoding (in case nick contains
+     special characters). */
+  if ((0 !=
+       QRinput_append (qri,
+                       QR_MODE_AN,
+                       strlen (upper),
+                       (unsigned char *) upper)) &&
+      (0 !=
+       QRinput_append (qri,
+                       QR_MODE_8,
+                       strlen (upper),
+                       (unsigned char *) upper)))
+  {
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+                         "QRinput_append");
+    GNUNET_free (upper);
+    return;
+  }
+  GNUNET_free (upper);
+  qrc = QRcode_encodeInput (qri);
+  if (NULL == qrc)
+  {
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+                         "QRcode_encodeInput");
+    QRinput_free (qri);
+    return;
+  }
+  size = qrc->width * scale;
+  size += 8 - (size % 8);
+  pixels = GNUNET_malloc (size * size * n_channels);
+  for (unsigned int x = 0; x < size; x++)
+    for (unsigned int y = 0; y < size; y++)
+    {
+      unsigned int off =
+        (x * qrc->width / size) + (y * qrc->width / size) * qrc->width;
+      for (int c = 0; c < n_channels; c++)
+        pixels[(y * size + x) * n_channels + c] =
+          (0 == (qrc->data[off] & 1)) ? 0xFF : 0;
+    }
+  QRcode_free (qrc);
+  QRinput_free (qri);
+  // FIXME: use 'pixels'
+  GNUNET_free (pixels);
+}
+
+
+#endif
+
+
 static void
 SNACK_print_hex_info (const char*message,
                       const uint8_t *hexArray,
@@ -504,7 +601,9 @@ check_payment_cb (void *cls,
                 "Trying to talk to wallet to give it pay URI `%s'\n",
                 taler_pay_uri);
     GNUNET_assert (NULL == pa->pnd);
-    /* FIXME: show QR code here! */
+#if HAVE_QRENCODE_H
+    show_qrcode (taler_pay_uri);
+#endif
     pa->taler_pay_uri = GNUNET_strdup (taler_pay_uri);
     pa->task = GNUNET_SCHEDULER_add_now (&connect_nfc,
                                          pa);

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