From 5f914a980ce398be8c28708b6910944e2beb74c1 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Thu, 22 Apr 2021 23:34:11 +0200
Subject: integrate SPA

---
 src/backend/taler-merchant-httpd_spa.c | 197 +++++++++++++++++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100644 src/backend/taler-merchant-httpd_spa.c

(limited to 'src/backend/taler-merchant-httpd_spa.c')

diff --git a/src/backend/taler-merchant-httpd_spa.c b/src/backend/taler-merchant-httpd_spa.c
new file mode 100644
index 00000000..0e15ad4c
--- /dev/null
+++ b/src/backend/taler-merchant-httpd_spa.c
@@ -0,0 +1,197 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file taler-merchant-httpd_spa.c
+ * @brief logic to load the single page app (/)
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <taler/taler_util.h>
+#include <taler/taler_mhd_lib.h>
+#include "taler-merchant-httpd_statics.h"
+#include <gnunet/gnunet_mhd_compat.h>
+
+
+/**
+ * SPA, compressed.
+ */
+static struct MHD_Response *zspa;
+
+/**
+ * SPA, vanilla.
+ */
+static struct MHD_Response *spa;
+
+
+MHD_RESULT
+TMH_return_spa (const struct TMH_RequestHandler *rh,
+                   struct MHD_Connection *connection,
+                   struct TMH_HandlerContext *hc)
+{
+  if ( (MHD_YES ==
+        TALER_MHD_can_compress (connection)) &&
+       (NULL != zspa) )
+    return MHD_queue_response (connection,
+                               MHD_HTTP_OK,
+                               zspa);
+  return MHD_queue_response (connection,
+                             MHD_HTTP_OK,
+                             spa);
+}
+
+
+int
+TMH_spa_init ()
+{
+  char *dn;
+  int fd;
+  struct stat sb;
+
+  {
+    char *path;
+
+    path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_DATADIR);
+    if (NULL == path)
+    {
+      GNUNET_break (0);
+      return GNUNET_SYSERR;
+    }
+    GNUNET_asprintf (&dn,
+                     "%s/merchant/spa/spa.html",
+                     path);
+    GNUNET_free (path);
+  }
+
+  /* finally open template */
+  fd = open (dn,
+             O_RDONLY);
+  if (-1 == fd)
+  {
+    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+                              "open",
+                              dn);
+    GNUNET_free (dn);
+    return GNUNET_SYSERR;
+  }
+  if (0 !=
+      fstat (fd,
+             &sb))
+  {
+    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+                              "open",
+                              dn);
+    GNUNET_break (0 == close (fd));
+    GNUNET_free (dn);
+    return GNUNET_SYSERR;
+  }
+
+  {
+    void *in;
+    ssize_t r;
+    size_t csize;
+
+    in = GNUNET_malloc_large (sb.st_size);
+    if (NULL == in)
+    {
+      GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
+                           "malloc");
+      GNUNET_break (0 == close (fd));
+      GNUNET_free (dn);
+      return GNUNET_SYSERR;
+    }
+    r = read (fd,
+              in,
+              sb.st_size);
+    if ( (-1 == r) ||
+         (sb.st_size != (size_t) r) )
+    {
+      GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+                                "read",
+                                dn);
+      GNUNET_free (in);
+      GNUNET_break (0 == close (fd));
+      GNUNET_free (dn);
+      return GNUNET_SYSERR;
+    }
+    csize = (size_t) r;
+    if (MHD_YES ==
+        TALER_MHD_body_compress (&in,
+                                 &csize))
+    {
+      zspa = MHD_create_response_from_buffer (csize,
+                                              in,
+                                              MHD_RESPMEM_MUST_FREE);
+      if (NULL != zspa)
+      {
+        if (MHD_NO ==
+            MHD_add_response_header (zspa,
+                                     MHD_HTTP_HEADER_CONTENT_ENCODING,
+                                     "deflate"))
+        {
+          GNUNET_break (0);
+          MHD_destroy_response (zspa);
+          zspa = NULL;
+        }
+        GNUNET_break (MHD_YES ==
+                      MHD_add_response_header (zspa,
+                                               MHD_HTTP_HEADER_CONTENT_TYPE,
+                                               "text/html"));
+      }
+    }
+  }
+
+  spa = MHD_create_response_from_fd (sb.st_size,
+                                     fd);
+  if (NULL == spa)
+  {
+    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+                              "open",
+                              dn);
+    GNUNET_break (0 == close (fd));
+    GNUNET_free (dn);
+    if (NULL != zspa)
+    {
+      MHD_destroy_response (zspa);
+      zspa = NULL;
+    }
+    return GNUNET_SYSERR;
+  }
+  GNUNET_break (MHD_YES ==
+                MHD_add_response_header (spa,
+                                         MHD_HTTP_HEADER_CONTENT_TYPE,
+                                         "text/html"));
+  return GNUNET_OK;
+}
+
+
+/**
+ * Nicely shut down.
+ */
+void __attribute__ ((destructor))
+get_spa_fini ()
+{
+  if (NULL != spa)
+  {
+    MHD_destroy_response (spa);
+    spa = NULL;
+  }
+  if (NULL != zspa)
+  {
+    MHD_destroy_response (zspa);
+    zspa = NULL;
+  }
+}
-- 
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