[evolution] I#1309 - templates: Remove signature in $ORIG[quoted-body]

[Milan Crha <mcrha src gnome org>]

commit 854d31d2fc3b63c8b1a06bbf4f8da91dbe8f1411
Author: Milan Crha <mcrha redhat com>
Date:   Wed Jan 6 17:00:25 2021 +0100

    I#1309 - templates: Remove signature in $ORIG[quoted-body]
    
    Closes https://gitlab.gnome.org/GNOME/evolution/-/issues/1309

 src/mail/e-mail-templates.c | 61 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 55 insertions(+), 6 deletions(-)
---
diff --git a/src/mail/e-mail-templates.c b/src/mail/e-mail-templates.c
index b9372e9480..04fbde6331 100644
--- a/src/mail/e-mail-templates.c
+++ b/src/mail/e-mail-templates.c
@@ -25,6 +25,7 @@
 #include <string.h>
 
 #include "e-util/e-util.h"
+#include "em-format/e-mail-stripsig-filter.h"
 
 #include "em-composer-utils.h"
 #include "em-utils.h"
@@ -283,7 +284,7 @@ fill_template (CamelMimeMessage *message,
 
        /* Now extract body of the original message and replace the $ORIG[body] modifier in template */
        if (message_part && (has_quoted_body || e_util_strstrcase (template_body->str, "$ORIG[body]"))) {
-               GString *message_body;
+               GString *message_body, *message_body_nosig = NULL;
                CamelStream *mem_stream;
 
                stream = camel_stream_mem_new ();
@@ -314,6 +315,51 @@ fill_template (CamelMimeMessage *message,
                message_body = g_string_new_len ((gchar *) byte_array->data, byte_array->len);
                g_object_unref (stream);
 
+               if (has_quoted_body) {
+                       CamelMimeFilter *filter;
+
+                       stream = camel_stream_mem_new ();
+                       mem_stream = stream;
+
+                       ct = camel_mime_part_get_content_type (message_part);
+                       if (ct) {
+                               const gchar *charset = camel_content_type_param (ct, "charset");
+                               if (charset && *charset) {
+                                       CamelMimeFilter *filter = camel_mime_filter_charset_new (charset, 
"UTF-8");
+                                       if (filter) {
+                                               CamelStream *filtered = camel_stream_filter_new (stream);
+
+                                               if (filtered) {
+                                                       camel_stream_filter_add (CAMEL_STREAM_FILTER 
(filtered), filter);
+                                                       g_object_unref (stream);
+                                                       stream = filtered;
+                                               }
+
+                                               g_object_unref (filter);
+                                       }
+                               }
+                       }
+
+                       filter = e_mail_stripsig_filter_new (!message_html);
+                       if (filter) {
+                               CamelStream *filtered = camel_stream_filter_new (stream);
+
+                               if (filtered) {
+                                       camel_stream_filter_add (CAMEL_STREAM_FILTER (filtered), filter);
+                                       g_object_unref (stream);
+                                       stream = filtered;
+                               }
+
+                               g_object_unref (filter);
+                       }
+
+                       camel_data_wrapper_decode_to_stream_sync (camel_medium_get_content (CAMEL_MEDIUM 
(message_part)), stream, NULL, NULL);
+                       camel_stream_flush (stream, NULL, NULL);
+                       byte_array = camel_stream_mem_get_byte_array (CAMEL_STREAM_MEM (mem_stream));
+                       message_body_nosig = g_string_new_len ((gchar *) byte_array->data, byte_array->len);
+                       g_object_unref (stream);
+               }
+
                if (template_html && !message_html) {
                        gchar *html = camel_text_to_html (
                                message_body->str,
@@ -350,22 +396,25 @@ fill_template (CamelMimeMessage *message,
                if (has_quoted_body) {
                        if (!message_html) {
                                gchar *html = camel_text_to_html (
-                                       message_body->str,
+                                       message_body_nosig->str,
                                        CAMEL_MIME_FILTER_TOHTML_CONVERT_NL |
                                        CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES |
                                        CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS |
                                        CAMEL_MIME_FILTER_TOHTML_QUOTE_CITATION |
                                        CAMEL_MIME_FILTER_TOHTML_CONVERT_ADDRESSES, 0);
-                               g_string_assign (message_body, html);
+                               g_string_assign (message_body_nosig, html);
                                g_free (html);
                        }
 
-                       g_string_prepend (message_body, "<blockquote type=\"cite\">");
-                       g_string_append (message_body, "</blockquote>");
+                       g_string_prepend (message_body_nosig, "<blockquote type=\"cite\">");
+                       g_string_append (message_body_nosig, "</blockquote>");
 
-                       replace_template_variable (template_body, "quoted-body", message_body->str);
+                       replace_template_variable (template_body, "quoted-body", message_body_nosig->str);
                }
 
+               if (message_body_nosig)
+                       g_string_free (message_body_nosig, TRUE);
+
                g_string_free (message_body, TRUE);
        } else {
                replace_template_variable (template_body, "body", "");