]> git.notmuchmail.org Git - notmuch/blobdiff - notmuch-reply.c
notmuch-reply.c: Handle munged `Reply-To' headers.
[notmuch] / notmuch-reply.c
index e85568c082ef8d519c1e391221e29867fc02d2aa..cb42de45b300acc0615080796c30c6e06fd08359 100644 (file)
 #include "notmuch-client.h"
 #include "gmime-filter-reply.h"
 
-static const struct {
-    const char *header;
-    const char *fallback;
-    GMimeRecipientType recipient_type;
-} reply_to_map[] = {
-    { "reply-to", "from", GMIME_RECIPIENT_TYPE_TO  },
-    { "to",         NULL, GMIME_RECIPIENT_TYPE_TO  },
-    { "cc",         NULL, GMIME_RECIPIENT_TYPE_CC  },
-    { "bcc",        NULL, GMIME_RECIPIENT_TYPE_BCC }
-};
-
 static void
 reply_part_content (GMimeObject *part)
 {
     GMimeStream *stream_stdout = NULL, *stream_filter = NULL;
     GMimeDataWrapper *wrapper;
+    const char *charset;
 
+    charset = g_mime_object_get_content_type_parameter (part, "charset");
     stream_stdout = g_mime_stream_file_new (stdout);
     if (stream_stdout) {
        g_mime_stream_file_set_owner (GMIME_STREAM_FILE (stream_stdout), FALSE);
        stream_filter = g_mime_stream_filter_new(stream_stdout);
+        if (charset) {
+          g_mime_stream_filter_add(GMIME_STREAM_FILTER(stream_filter),
+                                   g_mime_filter_charset_new(charset, "UTF-8"));
+        }
     }
     g_mime_stream_filter_add(GMIME_STREAM_FILTER(stream_filter),
                             g_mime_filter_reply_new(TRUE));
@@ -193,16 +188,101 @@ add_recipients_for_string (GMimeMessage *message,
     return add_recipients_for_address_list (message, config, type, list);
 }
 
+/* Some mailing lists munge the Reply-To header despite it being A Bad
+ * Thing, see http://www.unicom.com/pw/reply-to-harmful.html
+ *
+ * This function detects such munging so that reasonable headers can be
+ * generated anyway.  Returns 1 if munged, else 0.
+ *
+ * The current logic is fairly naive, Reply-To is diagnosed as munged if
+ * it contains exactly one address, and this address is also present in
+ * the To or Cc fields.
+ */
+static int
+mailing_list_munged_reply_to (notmuch_message_t *message)
+{
+    const char *header, *addr;
+    InternetAddressList *list;
+    InternetAddress *address;
+    InternetAddressMailbox *mailbox;
+
+    header = notmuch_message_get_header (message, "reply-to");
+    list = internet_address_list_parse_string (header);
+    if (internet_address_list_length (list) != 1)
+       return 0;
+    address = internet_address_list_get_address (list, 0);
+    if (INTERNET_ADDRESS_IS_GROUP (address))
+       return 0;
+    mailbox = INTERNET_ADDRESS_MAILBOX (address);
+    addr = internet_address_mailbox_get_addr (mailbox);
+    /* Note that strcasestr() is a GNU extension, strstr() might be sufficient */
+    if (strcasestr (notmuch_message_get_header (message, "to"), addr) == 0 ||
+       strcasestr (notmuch_message_get_header (message, "cc"), addr) == 0)
+       return 1;
+    return 0; }
+
+/* Augments the recipients of reply from the headers of message.
+ *
+ * If any of the user's addresses were found in these headers, the first
+ * of these returned, otherwise NULL is returned.
+ */
+static const char *
+add_recipients_from_message (GMimeMessage *reply,
+                            notmuch_config_t *config,
+                            notmuch_message_t *message)
+{
+    struct {
+       const char *header;
+       const char *fallback;
+       GMimeRecipientType recipient_type;
+    } reply_to_map[] = {
+       { "reply-to", "from", GMIME_RECIPIENT_TYPE_TO  },
+       { "to",         NULL, GMIME_RECIPIENT_TYPE_TO  },
+       { "cc",         NULL, GMIME_RECIPIENT_TYPE_CC  },
+       { "bcc",        NULL, GMIME_RECIPIENT_TYPE_BCC }
+    };
+    const char *from_addr = NULL;
+    unsigned int i;
+
+    /* When we have detected Reply-To munging, we ignore the Reply-To
+     * field (because it appears in the To or Cc headers) and use the
+     * From header so that person will get pinged and will actually
+     * receive the response if not subscribed to the list.  Note that
+     * under no circumstances does this fail to reply to the address in
+     * the Reply-To header.
+     */
+    if (mailing_list_munged_reply_to (message)) {
+       reply_to_map[0].header = "from";
+       reply_to_map[0].fallback = NULL;
+    }
+
+    for (i = 0; i < ARRAY_SIZE (reply_to_map); i++) {
+       const char *addr, *recipients;
+
+       recipients = notmuch_message_get_header (message,
+                                                reply_to_map[i].header);
+       if ((recipients == NULL || recipients[0] == '\0') && reply_to_map[i].fallback)
+           recipients = notmuch_message_get_header (message,
+                                                    reply_to_map[i].fallback);
+
+       addr = add_recipients_for_string (reply, config,
+                                         reply_to_map[i].recipient_type,
+                                         recipients);
+       if (from_addr == NULL)
+           from_addr = addr;
+    }
+    return from_addr;
+}
+
 static int
 notmuch_reply_format_default(void *ctx, notmuch_config_t *config, notmuch_query_t *query)
 {
     GMimeMessage *reply;
     notmuch_messages_t *messages;
     notmuch_message_t *message;
-    const char *subject, *recipients, *from_addr = NULL;
+    const char *subject, *from_addr = NULL;
     const char *in_reply_to, *orig_references, *references;
     char *reply_headers;
-    unsigned int i;
 
     for (messages = notmuch_query_search_messages (query);
         notmuch_messages_has_more (messages);
@@ -223,21 +303,7 @@ notmuch_reply_format_default(void *ctx, notmuch_config_t *config, notmuch_query_
            subject = talloc_asprintf (ctx, "Re: %s", subject);
        g_mime_message_set_subject (reply, subject);
 
-       for (i = 0; i < ARRAY_SIZE (reply_to_map); i++) {
-           const char *addr;
-
-           recipients = notmuch_message_get_header (message,
-                                                    reply_to_map[i].header);
-           if ((recipients == NULL || recipients[0] == '\0') && reply_to_map[i].fallback)
-               recipients = notmuch_message_get_header (message,
-                                                        reply_to_map[i].fallback);
-
-           addr = add_recipients_for_string (reply, config,
-                                             reply_to_map[i].recipient_type,
-                                             recipients);
-           if (from_addr == NULL)
-               from_addr = addr;
-       }
+       from_addr = add_recipients_from_message (reply, config, message);
 
        if (from_addr == NULL)
            from_addr = notmuch_config_get_user_primary_email (config);
@@ -290,9 +356,8 @@ notmuch_reply_format_headers_only(void *ctx, notmuch_config_t *config, notmuch_q
     GMimeMessage *reply;
     notmuch_messages_t *messages;
     notmuch_message_t *message;
-    const char *recipients, *in_reply_to, *orig_references, *references;
+    const char *in_reply_to, *orig_references, *references;
     char *reply_headers;
-    unsigned int i;
 
     for (messages = notmuch_query_search_messages (query);
         notmuch_messages_has_more (messages);
@@ -310,31 +375,23 @@ notmuch_reply_format_headers_only(void *ctx, notmuch_config_t *config, notmuch_q
        in_reply_to = talloc_asprintf (ctx, "<%s>",
                             notmuch_message_get_message_id (message));
 
+        g_mime_object_set_header (GMIME_OBJECT (reply),
+                                 "In-Reply-To", in_reply_to);
+
+
        orig_references = notmuch_message_get_header (message, "references");
 
-       /* We print References first because git format-patch treats it specially.
-        * Git uses the first entry of References to create In-Reply-To.
+       /* We print In-Reply-To followed by References because git format-patch treats them
+         * specially.  Git does not interpret the other headers specially
         */
        references = talloc_asprintf (ctx, "%s%s%s",
-                                     in_reply_to,
                                      orig_references ? orig_references : "",
-                                     orig_references ? " " : "");
+                                     orig_references ? " " : "",
+                                     in_reply_to);
        g_mime_object_set_header (GMIME_OBJECT (reply),
                                  "References", references);
 
-       for (i = 0; i < ARRAY_SIZE (reply_to_map); i++) {
-           const char *addr;
-
-           recipients = notmuch_message_get_header (message,
-                                                    reply_to_map[i].header);
-           if ((recipients == NULL || recipients[0] == '\0') && reply_to_map[i].fallback)
-               recipients = notmuch_message_get_header (message,
-                                                        reply_to_map[i].fallback);
-
-           addr = add_recipients_for_string (reply, config,
-                                             reply_to_map[i].recipient_type,
-                                             recipients);
-       }
+       (void)add_recipients_from_message (reply, config, message);
 
        g_mime_object_set_header (GMIME_OBJECT (reply), "Bcc",
                           notmuch_config_get_user_primary_email (config));