path: root/em-format/e-mail-formatter-utils.c

/*
 * e-mail-formatter-utils.h
 *
 * 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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

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

#include "e-mail-formatter-utils.h"

#include <string.h>
#include <glib/gi18n.h>

#include <camel/camel.h>
#include <libedataserver/libedataserver.h>

#include <e-util/e-util.h>
#include <libemail-engine/e-mail-utils.h>
#include <libemail-engine/mail-config.h>

static const gchar *addrspec_hdrs[] = {
    "Sender", "From", "Reply-To", "To", "Cc", "Bcc",
    "Resent-Sender", "Resent-From", "Resent-Reply-To",
    "Resent-To", "Resent-Cc", "Resent-Bcc", NULL
};

void
e_mail_formatter_format_text_header (EMailFormatter *formatter,
                                     GString *buffer,
                                     const gchar *label,
                                     const gchar *value,
                                     guint32 flags)
{
    GtkTextDirection direction;
    const gchar *fmt, *html;
    const gchar *display;
    gchar *mhtml = NULL;

    g_return_if_fail (E_IS_MAIL_FORMATTER (formatter));
    g_return_if_fail (buffer != NULL);
    g_return_if_fail (label != NULL);

    if (value == NULL)
        return;

    while (*value == ' ')
        value++;

    if (!(flags & E_MAIL_FORMATTER_HEADER_FLAG_HTML)) {
        CamelMimeFilterToHTMLFlags text_format_flags;

        text_format_flags =
            e_mail_formatter_get_text_format_flags (formatter);
        html = mhtml = camel_text_to_html (
            value, text_format_flags, 0);
    } else {
        html = value;
    }

    direction = gtk_widget_get_default_direction ();

    if (flags & E_MAIL_FORMATTER_HEADER_FLAG_NOCOLUMNS) {
        if (flags & E_MAIL_FORMATTER_HEADER_FLAG_BOLD) {
            fmt = "<tr style=\"display: %s\">"
                "<td><b>%s:</b> %s</td></tr>";
        } else {
            fmt = "<tr style=\"display: %s\">"
                "<td>%s: %s</td></tr>";
        }
    } else if (flags & E_MAIL_FORMATTER_HEADER_FLAG_NODEC) {
        if (direction == GTK_TEXT_DIR_RTL)
            fmt = "<tr class=\"header\" style=\"display: %s\">"
                "<th class=\"header rtl\">%s</th>"
                "<td class=\"header rtl\">%s</td>"
                "</tr>";
        else
            fmt = "<tr class=\"header\" style=\"display: %s\">"
                "<th class=\"header ltr\">%s</th>"
                "<td class=\"header ltr\">%s</td>"
                "</tr>";
    } else {
        if (direction == GTK_TEXT_DIR_RTL)
            fmt = "<tr class=\"header\" style=\"display: %s\">"
                "<th class=\"header rtl\">%s:</th>"
                "<td class=\"header rtl\">%s</td>"
                "</tr>";
        else
            fmt = "<tr class=\"header\" style=\"display: %s\">"
                "<th class=\"header ltr\">%s:</th>"
                "<td class=\"header ltr\">%s</td>"
                "</tr>";
    }

    if (flags & E_MAIL_FORMATTER_HEADER_FLAG_HIDDEN)
        display = "none";
    else
        display = "table-row";

    g_string_append_printf (buffer, fmt, display, label, html);

    g_free (mhtml);
}

gchar *
e_mail_formatter_format_address (EMailFormatter *formatter,
                                 GString *out,
                                 struct _camel_header_address *a,
                                 const gchar *field,
                                 gboolean no_links,
                                 gboolean elipsize)
{
    CamelMimeFilterToHTMLFlags flags;
    gchar *name, *mailto, *addr;
    gint i = 0;
    gchar *str = NULL;
    gint limit = mail_config_get_address_count ();

    g_return_val_if_fail (E_IS_MAIL_FORMATTER (formatter), NULL);
    g_return_val_if_fail (out != NULL, NULL);
    g_return_val_if_fail (field != NULL, NULL);

    flags = CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES;

    while (a != NULL) {
        if (a->name)
            name = camel_text_to_html (a->name, flags, 0);
        else
            name = NULL;

        switch (a->type) {
        case CAMEL_HEADER_ADDRESS_NAME:
            if (name != NULL && *name != '\0') {
                gchar *real, *mailaddr;

                if (strchr (a->name, ',') || strchr (a->name, ';'))
                    g_string_append_printf (out, "&quot;%s&quot;", name);
                else
                    g_string_append (out, name);

                g_string_append (out, " &lt;");

                /* rfc2368 for mailto syntax and url encoding extras */
                if ((real = camel_header_encode_phrase ((guchar *) a->name))) {
                    mailaddr = g_strdup_printf ("%s <%s>", real, a->v.addr);
                    g_free (real);
                    mailto = camel_url_encode (mailaddr, "?=&()");
                    g_free (mailaddr);
                } else {
                    mailto = camel_url_encode (a->v.addr, "?=&()");
                }
            } else {
                mailto = camel_url_encode (a->v.addr, "?=&()");
            }
            addr = camel_text_to_html (a->v.addr, flags, 0);
            if (no_links)
                g_string_append_printf (out, "%s", addr);
            else
                g_string_append_printf (out, "<a href=\"mailto:%s\">%s</a>", mailto, addr);
            g_free (mailto);
            g_free (addr);

            if (name != NULL && *name != '\0')
                g_string_append (out, "&gt;");
            break;
        case CAMEL_HEADER_ADDRESS_GROUP:
            g_string_append_printf (out, "%s: ", name);
            e_mail_formatter_format_address (
                formatter, out, a->v.members, field,
                no_links, elipsize);
            g_string_append_printf (out, ";");
            break;
        default:
            g_warning ("Invalid address type");
            break;
        }

        g_free (name);

        i++;
        a = a->next;
        if (a != NULL)
            g_string_append (out, ", ");

        if (!elipsize)
            continue;

        /* Let us add a '...' if we have more addresses */
        if (limit > 0 && i == limit && a != NULL) {
            if (strcmp (field, _("To")) == 0 ||
                strcmp (field, _("Cc")) == 0 ||
                strcmp (field, _("Bcc")) == 0) {

                g_string_append (
                    out,
                    "<span id=\"__evo-moreaddr\" "
                    "style=\"display: none;\">");
                str = g_strdup_printf (
                    "<img src=\"evo-file://%s/plus.png\" "
                    "id=\"__evo-moreaddr-img\" class=\"navigable\">",
                    EVOLUTION_IMAGESDIR);
            }
        }
    }

    if (elipsize && str) {
        if (strcmp (field, _("To")) == 0 ||
            strcmp (field, _("Cc")) == 0 ||
            strcmp (field, _("Bcc")) == 0) {

            g_string_append (
                out,
                "</span>"
                "<span class=\"navigable\" "
                    "id=\"__evo-moreaddr-ellipsis\" "
                    "style=\"display: inline;\">...</span>");
        }
    }

    return str;
}

void
e_mail_formatter_canon_header_name (gchar *name)
{
    gchar *inptr = name;

    g_return_if_fail (name != NULL);

    /* canonicalise the header name... first letter is
     * capitalised and any letter following a '-' also gets
     * capitalised */

    if (*inptr >= 'a' && *inptr <= 'z')
        *inptr -= 0x20;

    inptr++;

    while (*inptr) {
        if (inptr[-1] == '-' && *inptr >= 'a' && *inptr <= 'z')
            *inptr -= 0x20;
        else if (*inptr >= 'A' && *inptr <= 'Z')
            *inptr += 0x20;

        inptr++;
    }
}

void
e_mail_formatter_format_header (EMailFormatter *formatter,
                                GString *buffer,
                                const gchar *header_name,
                                const gchar *header_value,
                                guint32 flags,
                                const gchar *charset)
{
    gchar *canon_name, *buf, *value = NULL;
    const gchar *label, *txt;
    gboolean addrspec = FALSE;
    gchar *str_field = NULL;
    gint i;

    g_return_if_fail (E_IS_MAIL_FORMATTER (formatter));
    g_return_if_fail (buffer != NULL);
    g_return_if_fail (header_name != NULL);
    g_return_if_fail (header_value != NULL);

    canon_name = g_alloca (strlen (header_name) + 1);
    strcpy (canon_name, header_name);
    e_mail_formatter_canon_header_name (canon_name);

    for (i = 0; addrspec_hdrs[i]; i++) {
        if (g_str_equal (canon_name, addrspec_hdrs[i])) {
            addrspec = TRUE;
            break;
        }
    }

    label = _(canon_name);

    if (addrspec) {
        struct _camel_header_address *addrs;
        GString *html;
        gchar *img;
        gchar *charset;

        charset = e_mail_formatter_dup_charset (formatter);
        if (charset == NULL)
            charset = e_mail_formatter_dup_default_charset (formatter);

        buf = camel_header_unfold (header_value);
        addrs = camel_header_address_decode (buf, charset);
        if (addrs == NULL) {
            g_free (charset);
            g_free (buf);
            return;
        }

        g_free (charset);
        g_free (buf);

        html = g_string_new ("");
        img = e_mail_formatter_format_address (
            formatter, html, addrs, label,
            (flags & E_MAIL_FORMATTER_HEADER_FLAG_NOLINKS),
            !(flags & E_MAIL_FORMATTER_HEADER_FLAG_NOELIPSIZE));

        if (img != NULL) {
            str_field = g_strdup_printf ("%s: %s", label, img);
            label = str_field;
            flags |= E_MAIL_FORMATTER_HEADER_FLAG_NODEC;
            g_free (img);
        }

        camel_header_address_list_clear (&addrs);
        txt = value = html->str;
        g_string_free (html, FALSE);

        flags |= E_MAIL_FORMATTER_HEADER_FLAG_HTML;
        flags |= E_MAIL_FORMATTER_HEADER_FLAG_BOLD;

    } else if (g_str_equal (canon_name, "Subject")) {
        buf = camel_header_unfold (header_value);
        txt = value = camel_header_decode_string (buf, charset);
        g_free (buf);

        flags |= E_MAIL_FORMATTER_HEADER_FLAG_BOLD;

    } else if (g_str_equal (canon_name, "X-Evolution-Mailer")) {
        /* pseudo-header */
        label = _("Mailer");
        txt = value = camel_header_format_ctext (header_value, charset);
        flags |= E_MAIL_FORMATTER_HEADER_FLAG_BOLD;

    } else if (g_str_equal (canon_name, "Date") ||
           g_str_equal (canon_name, "Resent-Date")) {
        CamelMimeFilterToHTMLFlags text_format_flags;
        gint msg_offset, local_tz;
        time_t msg_date;
        struct tm local;
        gchar *html;
        gboolean hide_real_date;

        hide_real_date = !e_mail_formatter_get_show_real_date (formatter);

        txt = header_value;
        while (*txt == ' ' || *txt == '\t')
            txt++;

        text_format_flags =
            e_mail_formatter_get_text_format_flags (formatter);

        html = camel_text_to_html (txt, text_format_flags, 0);

        msg_date = camel_header_decode_date (txt, &msg_offset);
        e_localtime_with_offset (msg_date, &local, &local_tz);

        /* Convert message offset to minutes (e.g. -0400 --> -240) */
        msg_offset = ((msg_offset / 100) * 60) + (msg_offset % 100);
        /* Turn into offset from localtime, not UTC */
        msg_offset -= local_tz / 60;

        /* value will be freed at the end */
        if (!hide_real_date && !msg_offset) {
            /* No timezone difference; just
             * show the real Date: header. */
            txt = value = html;
        } else {
            gchar *date_str;

            date_str = e_datetime_format_format (
                "mail", "header",
                DTFormatKindDateTime, msg_date);

            if (hide_real_date) {
                /* Show only the local-formatted date, losing
                 * all timezone information like Outlook does.
                 * Should we attempt to show it somehow? */
                txt = value = date_str;
            } else {
                txt = value = g_strdup_printf (
                    "%s (<I>%s</I>)", html, date_str);
                g_free (date_str);
            }
            g_free (html);
        }

        flags |= E_MAIL_FORMATTER_HEADER_FLAG_HTML;
        flags |= E_MAIL_FORMATTER_HEADER_FLAG_BOLD;

    } else if (g_str_equal (canon_name, "Newsgroups")) {
        struct _camel_header_newsgroup *ng, *scan;
        GString *html;

        buf = camel_header_unfold (header_value);

        if (!(ng = camel_header_newsgroups_decode (buf))) {
            g_free (buf);
            return;
        }

        g_free (buf);

        html = g_string_new ("");
        scan = ng;
        while (scan) {
            if (flags & E_MAIL_FORMATTER_HEADER_FLAG_NOLINKS)
                g_string_append_printf (
                    html, "%s", scan->newsgroup);
            else
                g_string_append_printf (
                    html, "<a href=\"news:%s\">%s</a>",
                    scan->newsgroup, scan->newsgroup);
            scan = scan->next;
            if (scan)
                g_string_append_printf (html, ", ");
        }

        camel_header_newsgroups_free (ng);

        txt = html->str;
        g_string_free (html, FALSE);

        flags |= E_MAIL_FORMATTER_HEADER_FLAG_HTML;
        flags |= E_MAIL_FORMATTER_HEADER_FLAG_BOLD;

    } else if (g_str_equal (canon_name, "Received") ||
           g_str_has_prefix (canon_name, "X-")) {
        /* don't unfold Received nor extension headers */
        txt = value = camel_header_decode_string (header_value, charset);

    } else {
        /* don't unfold Received nor extension headers */
        buf = camel_header_unfold (header_value);
        txt = value = camel_header_decode_string (buf, charset);
        g_free (buf);
    }

    e_mail_formatter_format_text_header (
        formatter, buffer, label, txt, flags);

    g_free (value);
    g_free (str_field);
}

GList *
e_mail_formatter_find_rfc822_end_iter (GList *rfc822_start_iter)
{
    GList *link = rfc822_start_iter;
    EMailPart *part;
    const gchar *part_id;
    gchar *end;

    g_return_val_if_fail (rfc822_start_iter != NULL, NULL);

    part = E_MAIL_PART (link->data);

    part_id = e_mail_part_get_id (part);
    g_return_val_if_fail (part_id != NULL, NULL);

    end = g_strconcat (part_id, ".end", NULL);

    while (link != NULL) {
        part = E_MAIL_PART (link->data);

        part_id = e_mail_part_get_id (part);
        g_return_val_if_fail (part_id != NULL, NULL);

        if (g_strcmp0 (part_id, end) == 0)
            break;

        link = g_list_next (link);
    }

    g_free (end);

    return link;
}

gchar *
e_mail_formatter_parse_html_mnemonics (const gchar *label,
                                       gchar **out_access_key)
{
    const gchar *pos = NULL;
    GString *html_label = NULL;

    g_return_val_if_fail (label != NULL, NULL);

    if (out_access_key != NULL)
        *out_access_key = NULL;

    pos = strstr (label, "_");
    if (pos != NULL) {
        gchar ak = pos[1];

        /* Convert to uppercase */
        if (ak >= 'a')
            ak = ak - 32;

        html_label = g_string_new ("");
        g_string_append_len (html_label, label, pos - label);
        g_string_append_printf (html_label, "<u>%c</u>", pos[1]);
        g_string_append (html_label, &pos[2]);

        if (out_access_key != NULL && ak != '\0')
            *out_access_key = g_strdup_printf ("%c", ak);

    } else {
        html_label = g_string_new (label);
    }

    return g_string_free (html_label, FALSE);
}