From de5437643580173452eb0ab838e2033579604efc Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Mon, 9 Mar 2020 23:50:25 +0100
Subject: switch to proper base64 encoding of preview images, add mime type
 logic

---
 src/main.c | 47 +++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 8 deletions(-)

diff --git a/src/main.c b/src/main.c
index ff46a7e..ba1b6dc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1557,9 +1557,8 @@ launch_payment (struct Product *product)
   /* create the json object for the order request */
   if (NULL != product->preview)
   {
-    orderReq = json_pack ("{ s:{s:s}, s:s, s:o, s:s, s:o }",
+    orderReq = json_pack ("{ s:s, s:s, s:o, s:s, s:o }",
                           "summary",
-                          "_",
                           product->description,
                           "preview", product->preview,
                           "amount", TALER_JSON_from_amount (&product->price),
@@ -1570,9 +1569,8 @@ launch_payment (struct Product *product)
   }
   else
   {
-    orderReq = json_pack ("{ s:{s:s}, s:o, s:s, s:o }",
+    orderReq = json_pack ("{ s:s}, s:o, s:s, s:o }",
                           "summary",
-                          "_",
                           product->description,
                           "amount", TALER_JSON_from_amount (&product->price),
                           "fulfillment_url", fulflmntUrl
@@ -2036,7 +2034,7 @@ write_mdb_command (void *cls)
       chkSum += mdb.txBuffer[idx] = mdb.cmd->cmd.bin[idx];
     for (size_t idx = 0; idx < mdb.cmd->data.bin_size; idx++)
       chkSum += mdb.txBuffer[idx + mdb.cmd->cmd.bin_size] =
-        mdb.cmd->data.bin[idx];
+                  mdb.cmd->data.bin[idx];
     mdb.txBuffer[mdb.cmd->cmd.bin_size + mdb.cmd->data.bin_size] =
       (uint8_t) (chkSum & 0xFF);
   }
@@ -2715,9 +2713,42 @@ read_products (void *cls,
         }
         else
         {
-          tmpProduct.preview
-            = GNUNET_STRINGS_data_to_string_alloc (thumb,
-                                                   len);
+          const char *mime_type = "";
+          const char *ext;
+          size_t preview_len;
+          char *base64;
+
+          ext = strrchr (thumbnail_fn, '.');
+          if (NULL != ext)
+          {
+            static const struct
+            {
+              const char *ext;
+              const char *mime;
+            } mimes[] = {
+              { ".png", "image/png" },
+              { ".jpg", "image/jpeg" },
+              { ".jpeg", "image/jpeg" },
+              { ".svg", "image/svg" },
+              { NULL, NULL }
+            };
+
+            for (unsigned int i = 0; NULL != mimes[i].ext; i++)
+              if (0 == strcasecmp (mimes[i].ext,
+                                   ext))
+              {
+                mime_type = mimes[i].mime;
+                break;
+              }
+          }
+          (void) GNUNET_STRINGS_base64_encode (thumb,
+                                               len,
+                                               &base64);
+          GNUNET_asprintf (&tmpProduct.preview,
+                           "data:%s;base64,%s",
+                           mime_type,
+                           base64);
+          GNUNET_free (base64);
         }
         GNUNET_free (thumb);
       }
-- 
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