integrate SPA

4 files changed, 257 insertions, 5 deletions

diff --git a/src/backend/Makefile.am b/src/backend/Makefile.am
index 3dd126a6..93a069af 100644
--- a/src/backend/Makefile.am
+++ b/src/backend/Makefile.am
@@ -98,6 +98,8 @@ taler_merchant_httpd_SOURCES = \
     taler-merchant-httpd_qr.h \
   taler-merchant-httpd_reserves.c \
     taler-merchant-httpd_reserves.h \
+  taler-merchant-httpd_spa.c \
+    taler-merchant-httpd_spa.h \
   taler-merchant-httpd_statics.c \
     taler-merchant-httpd_statics.h \
   taler-merchant-httpd_templating.c \
diff --git a/src/backend/taler-merchant-httpd.c b/src/backend/taler-merchant-httpd.c
index b331bef5..5cfec854 100644
--- a/src/backend/taler-merchant-httpd.c
+++ b/src/backend/taler-merchant-httpd.c
@@ -64,6 +64,7 @@
 #include "taler-merchant-httpd_post-orders-ID-refund.h"
 #include "taler-merchant-httpd_post-tips-ID-pickup.h"
 #include "taler-merchant-httpd_reserves.h"
+#include "taler-merchant-httpd_spa.h"
 #include "taler-merchant-httpd_statics.h"
 #include "taler-merchant-httpd_templating.h"
 
@@ -1417,12 +1418,9 @@ url_handler (void *cls,
     {
       .url_prefix = "/",
       .method = MHD_HTTP_METHOD_GET,
-      .mime_type = "text/plain",
+      .mime_type = "text/html",
       .skip_instance = true,
-      .data = "This is a GNU Taler merchant backend. See https://taler.net/.\n",
-      .data_size = strlen (
-        "This is a GNU Taler merchant backend. See https://taler.net/.\n"),
-      .handler = &TMH_MHD_handler_static_response,
+      .handler = &TMH_return_spa,
       .response_code = MHD_HTTP_OK
     },
     {
@@ -2096,6 +2094,14 @@ run (void *cls,
                                             "FORCE_AUDIT"))
     TMH_force_audit = GNUNET_YES;
   TMH_templating_init ();
+  if (GNUNET_OK !=
+      TMH_spa_init ())
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Failed to load single page app\n");
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
   TMH_statics_init ();
   elen = TMH_EXCHANGES_init (config);
   if (GNUNET_SYSERR == elen)
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;
+  }
+}
diff --git a/src/backend/taler-merchant-httpd_spa.h b/src/backend/taler-merchant-httpd_spa.h
new file mode 100644
index 00000000..8a998c38
--- /dev/null
+++ b/src/backend/taler-merchant-httpd_spa.h
@@ -0,0 +1,47 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2021 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.h
+ * @brief logic to preload and serve static files
+ * @author Christian Grothoff
+ */
+#ifndef TALER_MERCHANT_HTTPD_SPA_H
+#define TALER_MERCHANT_HTTPD_SPA_H
+
+#include <microhttpd.h>
+#include "taler-merchant-httpd.h"
+
+/**
+ * Return our single-page-app user interface (see contrib/spa.html).
+ *
+ * @param rh request handler
+ * @param connection the connection we act upon
+ * @param hc handler context
+ * @return #MHD_YES on success (reply queued), #MHD_NO on error (close connection)
+ */
+MHD_RESULT
+TMH_return_spa (const struct TMH_RequestHandler *rh,
+                struct MHD_Connection *connection,
+                struct TMH_HandlerContext *hc);
+
+/**
+ * Preload and compress SPA file.
+ */
+int
+TMH_spa_init (void);
+
+
+#endif