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show: Rewrite show_message_body to use the MIME tree interface.
This removes all of the MIME traversal logic from show_message_body and leaves only its interaction with the format callbacks. Besides isolating concerns, since traversal happens behind a trivial interface, there is now much less code duplication in show_message_part. Also, this uses mime_node_seek_dfs to start at the requested part, eliminating all of the logic about parts being selected or being in_zone (and reducing the "show state" to only a part counter). notmuch_show_params_t no longer needs to be passed through the recursion because the only two fields that mattered (related to crypto) are now handled by the MIME tree. The few remaining complexities in show_message_part highlight irregularities in the format callbacks with respect to top-level messages and embedded message parts. Since this is a rewrite, the diff is not very enlightening. It's easier to look at the old code and the new code side-by-side.
This commit is contained in:
Austin Clements
David Bremner
parent
5d1ac7d1d3
commit
d61cef374b
1 changed files with 52 additions and 177 deletions
203
show-message.c
203
show-message.c
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@ -24,204 +24,79 @@
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typedef struct show_message_state {
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int part_count;
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int in_zone;
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} show_message_state_t;
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static void
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show_message_part (GMimeObject *part,
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show_message_part (mime_node_t *node,
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show_message_state_t *state,
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const notmuch_show_format_t *format,
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notmuch_show_params_t *params,
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int first)
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{
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GMimeObject *decryptedpart = NULL;
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int selected;
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state->part_count += 1;
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if (! (GMIME_IS_PART (part) || GMIME_IS_MULTIPART (part) || GMIME_IS_MESSAGE_PART (part))) {
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fprintf (stderr, "Warning: Not displaying unknown mime part: %s.\n",
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g_type_name (G_OBJECT_TYPE (part)));
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return;
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}
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selected = (params->part <= 0 || state->part_count == params->part);
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if (selected || state->in_zone) {
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if (!first && (params->part <= 0 || state->in_zone))
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fputs (format->part_sep, stdout);
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if (format->part_start)
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format->part_start (part, &(state->part_count));
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}
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/* handle PGP/MIME parts */
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if (GMIME_IS_MULTIPART (part) && params->cryptoctx) {
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GMimeMultipart *multipart = GMIME_MULTIPART (part);
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GError* err = NULL;
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if (GMIME_IS_MULTIPART_ENCRYPTED (part) && params->decrypt)
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{
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if ( g_mime_multipart_get_count (multipart) != 2 ) {
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/* this violates RFC 3156 section 4, so we won't bother with it. */
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fprintf (stderr,
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"Error: %d part(s) for a multipart/encrypted message (should be exactly 2)\n",
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g_mime_multipart_get_count (multipart));
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} else {
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GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part);
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decryptedpart = g_mime_multipart_encrypted_decrypt (encrypteddata, params->cryptoctx, &err);
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if (decryptedpart) {
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if ((selected || state->in_zone) && format->part_encstatus)
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format->part_encstatus (1);
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const GMimeSignatureValidity *sigvalidity = g_mime_multipart_encrypted_get_signature_validity (encrypteddata);
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if (!sigvalidity)
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fprintf (stderr, "Failed to verify signed part: %s\n", (err ? err->message : "no error explanation given"));
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if ((selected || state->in_zone) && format->part_sigstatus)
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format->part_sigstatus (sigvalidity);
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} else {
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fprintf (stderr, "Failed to decrypt part: %s\n", (err ? err->message : "no error explanation given"));
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if ((selected || state->in_zone) && format->part_encstatus)
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format->part_encstatus (0);
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}
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}
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}
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else if (GMIME_IS_MULTIPART_SIGNED (part))
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{
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if ( g_mime_multipart_get_count (multipart) != 2 ) {
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/* this violates RFC 3156 section 5, so we won't bother with it. */
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fprintf (stderr,
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"Error: %d part(s) for a multipart/signed message (should be exactly 2)\n",
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g_mime_multipart_get_count (multipart));
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} else {
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/* For some reason the GMimeSignatureValidity returned
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* here is not a const (inconsistent with that
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* returned by
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* g_mime_multipart_encrypted_get_signature_validity,
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* and therefore needs to be properly disposed of.
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* Hopefully the API will become more consistent. */
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GMimeSignatureValidity *sigvalidity = g_mime_multipart_signed_verify (GMIME_MULTIPART_SIGNED (part), params->cryptoctx, &err);
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if (!sigvalidity) {
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fprintf (stderr, "Failed to verify signed part: %s\n", (err ? err->message : "no error explanation given"));
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}
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if ((selected || state->in_zone) && format->part_sigstatus)
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format->part_sigstatus (sigvalidity);
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if (sigvalidity)
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g_mime_signature_validity_free (sigvalidity);
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}
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}
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if (err)
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g_error_free (err);
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}
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/* end handle PGP/MIME parts */
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if (selected || state->in_zone)
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format->part_content (part);
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if (GMIME_IS_MULTIPART (part)) {
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GMimeMultipart *multipart = GMIME_MULTIPART (part);
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/* Formatters expect the envelope for embedded message parts */
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GMimeObject *part = node->envelope_part ?
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GMIME_OBJECT (node->envelope_part) : node->part;
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int i;
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if (selected)
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state->in_zone = 1;
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if (!first)
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fputs (format->part_sep, stdout);
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if (decryptedpart) {
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/* We emit the useless application/pgp-encrypted version
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* part here only to keep the emitted output as consistent
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* as possible between decrypted output and the
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* unprocessed multipart/mime. For some strange reason,
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* the actual encrypted data is the second part of the
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* multipart. */
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show_message_part (g_mime_multipart_get_part (multipart, 0), state, format, params, TRUE);
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show_message_part (decryptedpart, state, format, params, FALSE);
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} else {
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for (i = 0; i < g_mime_multipart_get_count (multipart); i++) {
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show_message_part (g_mime_multipart_get_part (multipart, i),
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state, format, params, i == 0);
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}
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}
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/* Format this part */
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if (format->part_start)
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format->part_start (part, &(state->part_count));
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if (selected)
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state->in_zone = 0;
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if (node->decrypt_attempted && format->part_encstatus)
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format->part_encstatus (node->decrypt_success);
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} else if (GMIME_IS_MESSAGE_PART (part)) {
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GMimeMessage *mime_message = g_mime_message_part_get_message (GMIME_MESSAGE_PART (part));
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if (node->verify_attempted && format->part_sigstatus)
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format->part_sigstatus (node->sig_validity);
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if (selected)
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state->in_zone = 1;
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format->part_content (part);
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if (selected || (!selected && state->in_zone)) {
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if (node->envelope_part) {
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fputs (format->header_start, stdout);
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if (format->header_message_part)
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format->header_message_part (mime_message);
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format->header_message_part (GMIME_MESSAGE (node->part));
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fputs (format->header_end, stdout);
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fputs (format->body_start, stdout);
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}
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show_message_part (g_mime_message_get_mime_part (mime_message),
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state, format, params, TRUE);
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/* Recurse over the children */
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state->part_count += 1;
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for (i = 0; i < node->nchildren; i++)
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show_message_part (mime_node_child (node, i), state, format, i == 0);
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if (selected || (!selected && state->in_zone))
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/* Finish this part */
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if (node->envelope_part)
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fputs (format->body_end, stdout);
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if (selected)
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state->in_zone = 0;
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}
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if (selected || state->in_zone) {
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if (format->part_end)
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format->part_end (part);
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}
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}
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notmuch_status_t
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show_message_body (notmuch_message_t *message,
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const notmuch_show_format_t *format,
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notmuch_show_params_t *params)
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{
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GMimeStream *stream = NULL;
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GMimeParser *parser = NULL;
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GMimeMessage *mime_message = NULL;
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notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
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const char *filename = notmuch_message_get_filename (message);
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FILE *file = NULL;
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notmuch_status_t ret;
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show_message_state_t state;
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mime_node_t *root, *part;
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state.part_count = 0;
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state.in_zone = 0;
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file = fopen (filename, "r");
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if (! file) {
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fprintf (stderr, "Error opening %s: %s\n", filename, strerror (errno));
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ret = NOTMUCH_STATUS_FILE_ERROR;
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goto DONE;
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}
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stream = g_mime_stream_file_new (file);
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g_mime_stream_file_set_owner (GMIME_STREAM_FILE (stream), FALSE);
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parser = g_mime_parser_new_with_stream (stream);
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mime_message = g_mime_parser_construct_message (parser);
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show_message_part (g_mime_message_get_mime_part (mime_message),
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&state,
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format,
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params,
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TRUE);
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DONE:
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if (mime_message)
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g_object_unref (mime_message);
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if (parser)
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g_object_unref (parser);
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if (stream)
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g_object_unref (stream);
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if (file)
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fclose (file);
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ret = mime_node_open (NULL, message, params->cryptoctx, params->decrypt,
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&root);
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if (ret)
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return ret;
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/* The caller of show_message_body has already handled the
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* outermost envelope, so skip it. */
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state.part_count = MAX (params->part, 1);
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part = mime_node_seek_dfs (root, state.part_count);
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if (part)
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show_message_part (part, &state, format, TRUE);
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talloc_free (root);
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return NOTMUCH_STATUS_SUCCESS;
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}
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