aboutsummaryrefslogtreecommitdiffstats
path: root/em-format/e-mail-parser-multipart-alternative.c
blob: e023b9c63360c45f392b20fb585eb4f3f1ba9a06 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 * e-mail-parser-multipart-alternative.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * This program 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

#include <e-util/e-util.h>

#include "e-mail-parser-extension.h"
#include "e-mail-part-utils.h"

typedef EMailParserExtension EMailParserMultipartAlternative;
typedef EMailParserExtensionClass EMailParserMultipartAlternativeClass;

GType e_mail_parser_multipart_alternative_get_type (void);

G_DEFINE_TYPE (
    EMailParserMultipartAlternative,
    e_mail_parser_multipart_alternative,
    E_TYPE_MAIL_PARSER_EXTENSION)

static const gchar *parser_mime_types[] = {
    "multipart/alternative",
    NULL
};

static gboolean
related_display_part_is_attachment (CamelMimePart *part)
{
    CamelMimePart *display_part;

    display_part = e_mail_part_get_related_display_part (part, NULL);
    return display_part && e_mail_part_is_attachment (display_part);
}

static gboolean
empe_mp_alternative_parse (EMailParserExtension *extension,
                           EMailParser *parser,
                           CamelMimePart *part,
                           GString *part_id,
                           GCancellable *cancellable,
                           GQueue *out_mail_parts)
{
    CamelMultipart *mp;
    gint i, nparts, bestid = 0;
    CamelMimePart *best = NULL;
    EMailExtensionRegistry *reg;

    reg = e_mail_parser_get_extension_registry (parser);

    mp = (CamelMultipart *) camel_medium_get_content ((CamelMedium *) part);

    if (!CAMEL_IS_MULTIPART (mp))
        return e_mail_parser_parse_part_as (
            parser, part, part_id,
            "application/vnd.evolution.source",
            cancellable, out_mail_parts);

    /* as per rfc, find the last part we know how to display */
    nparts = camel_multipart_get_number (mp);
    for (i = 0; i < nparts; i++) {
        CamelMimePart *mpart;
        CamelDataWrapper *data_wrapper;
        CamelContentType *type;
        CamelStream *null_stream;
        gchar *mime_type;
        gsize content_size;

        if (g_cancellable_is_cancelled (cancellable))
            return TRUE;

        /* is it correct to use the passed in *part here? */
        mpart = camel_multipart_get_part (mp, i);

        if (mpart == NULL)
            continue;

        /* This may block even though the stream does not.
         * XXX Pretty inefficient way to test if the MIME part
         *     is empty.  Surely there's a quicker way? */
        null_stream = camel_stream_null_new ();
        data_wrapper = camel_medium_get_content (CAMEL_MEDIUM (mpart));
        camel_data_wrapper_decode_to_stream_sync (
            data_wrapper, null_stream, cancellable, NULL);
        content_size = CAMEL_STREAM_NULL (null_stream)->written;
        g_object_unref (null_stream);

        if (content_size == 0)
            continue;

        type = camel_mime_part_get_content_type (mpart);
        mime_type = camel_content_type_simple (type);

        camel_strdown (mime_type);

        if (!e_mail_part_is_attachment (mpart) &&
             ((camel_content_type_is (type, "multipart", "related") == 0) ||
              !related_display_part_is_attachment (mpart)) &&
            (e_mail_extension_registry_get_for_mime_type (reg, mime_type) ||
            ((best == NULL) &&
             (e_mail_extension_registry_get_fallback (reg, mime_type)))))
        {
            best = mpart;
            bestid = i;
        }

        g_free (mime_type);
    }

    if (best) {
        gint len = part_id->len;

        g_string_append_printf (part_id, ".alternative.%d", bestid);

        e_mail_parser_parse_part (
            parser, best, part_id,
            cancellable, out_mail_parts);

        g_string_truncate (part_id, len);
    } else {
        e_mail_parser_parse_part_as (
            parser, part, part_id, "multipart/mixed",
            cancellable, out_mail_parts);
    }

    return TRUE;
}

static void
e_mail_parser_multipart_alternative_class_init (EMailParserExtensionClass *class)
{
    class->mime_types = parser_mime_types;
    class->priority = G_PRIORITY_LOW;
    class->parse = empe_mp_alternative_parse;
}

static void
e_mail_parser_multipart_alternative_init (EMailParserExtension *extension)
{
}