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

/*
 * e-mail-formatter-headers.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 <glib/gi18n-lib.h>

#include <libedataserver/libedataserver.h>

#include <e-util/e-util.h>
#include <libemail-engine/libemail-engine.h>
#include <shell/e-shell.h>

#include "e-mail-formatter-extension.h"
#include "e-mail-formatter-utils.h"
#include "e-mail-inline-filter.h"
#include "e-mail-part-headers.h"

typedef EMailFormatterExtension EMailFormatterHeaders;
typedef EMailFormatterExtensionClass EMailFormatterHeadersClass;

GType e_mail_formatter_headers_get_type (void);

G_DEFINE_TYPE (
    EMailFormatterHeaders,
    e_mail_formatter_headers,
    E_TYPE_MAIL_FORMATTER_EXTENSION)

static const gchar *formatter_mime_types[] = {
    "application/vnd.evolution.headers",
    NULL
};

static void
format_short_headers (EMailFormatter *formatter,
                      GString *buffer,
                      EMailPart *part,
                      guint32 flags,
                      GCancellable *cancellable)
{
    CamelMimePart *mime_part;
    GtkTextDirection direction;
    gchar *hdr_charset;
    gchar *evolution_imagesdir;
    gchar *subject = NULL;
    struct _camel_header_address *addrs = NULL;
    struct _camel_header_raw *header;
    GString *from;

    if (g_cancellable_is_cancelled (cancellable))
        return;

    mime_part = e_mail_part_ref_mime_part (part);
    direction = gtk_widget_get_default_direction ();

    hdr_charset = e_mail_formatter_dup_charset (formatter);
    if (!hdr_charset)
        hdr_charset = e_mail_formatter_dup_default_charset (formatter);

    evolution_imagesdir = g_filename_to_uri (EVOLUTION_IMAGESDIR, NULL, NULL);
    from = g_string_new ("");

    g_string_append_printf (
        buffer,
        "<table class=\"header\" "
        "id=\"__evo-short-headers\" style=\"display: %s\">",
        flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSED ? "table" : "none");

    header = mime_part->headers;
    while (header) {
        if (!g_ascii_strcasecmp (header->name, "From")) {
            GString *tmp;
            if (!(addrs = camel_header_address_decode (header->value, hdr_charset))) {
                header = header->next;
                continue;
            }
            tmp = g_string_new ("");
            e_mail_formatter_format_address (
                formatter, tmp, addrs, header->name, FALSE,
                !(flags & E_MAIL_FORMATTER_HEADER_FLAG_NOELIPSIZE));

            if (tmp->len > 0)
                g_string_printf (
                    from, "%s: %s",
                    _("From"), tmp->str);
            g_string_free (tmp, TRUE);

        } else if (!g_ascii_strcasecmp (header->name, "Subject")) {
            gchar *buf = NULL;
            subject = camel_header_unfold (header->value);
            buf = camel_header_decode_string (subject, hdr_charset);
            g_free (subject);
            subject = camel_text_to_html (
                buf, CAMEL_MIME_FILTER_TOHTML_PRESERVE_8BIT, 0);
            g_free (buf);
        }
        header = header->next;
    }

    g_free (hdr_charset);

    g_string_append (buffer, "<tr class=\"header\">");
    if (direction == GTK_TEXT_DIR_RTL)
        g_string_append (buffer, "<td class=\"header rtl\">");
    else
        g_string_append (buffer, "<td class=\"header ltr\">");
    g_string_append (buffer, "<strong>");
    if (subject != NULL && *subject != '\0')
        g_string_append (buffer, subject);
    else
        g_string_append (buffer, _("(no subject)"));
    g_string_append (buffer, "</strong>");
    if (from->len > 0)
        g_string_append_printf (buffer, " (%s)", from->str);
    g_string_append (buffer, "</td></tr>");

    g_string_append (buffer, "</table>");

    g_free (subject);
    if (addrs)
        camel_header_address_list_clear (&addrs);

    g_string_free (from, TRUE);
    g_free (evolution_imagesdir);

    g_object_unref (mime_part);
}

static void
write_contact_picture (CamelMimePart *mime_part,
                       gint size,
                       GString *buffer)
{
    gchar *b64, *content_type;
    CamelDataWrapper *dw;
    CamelContentType *ct;
    GByteArray *ba = NULL;

    dw = camel_medium_get_content (CAMEL_MEDIUM (mime_part));
    if (dw != NULL)
        ba = camel_data_wrapper_get_byte_array (dw);

    if (ba == NULL || ba->len == 0) {
        const gchar *filename;

        filename = camel_mime_part_get_filename (mime_part);

        if (filename != NULL) {
            if (size >= 0) {
                g_string_append_printf (
                    buffer,
                    "<img width=\"%d\" src=\"evo-file://%s\" />",
                    size, filename);
            } else {
                g_string_append_printf (
                    buffer,
                    "<img src=\"evo-file://%s\" />",
                    filename);
            }
        }

        return;
    }

    b64 = g_base64_encode (ba->data, ba->len);
    ct = camel_mime_part_get_content_type (mime_part);
    content_type = camel_content_type_simple (ct);

    if (size >= 0) {
        g_string_append_printf (
            buffer,
            "<img width=\"%d\" src=\"data:%s;base64,%s\">",
            size, content_type, b64);
    } else {
        g_string_append_printf (
            buffer,
            "<img src=\"data:%s;base64,%s\">",
            content_type, b64);
    }

    g_free (b64);
    g_free (content_type);
}

static void
format_full_headers (EMailFormatter *formatter,
                     GString *buffer,
                     EMailPart *part,
                     guint32 mode,
                     guint32 flags,
                     GCancellable *cancellable)
{
    CamelMimePart *mime_part;
    const gchar *charset;
    CamelContentType *ct;
    struct _camel_header_raw *header;
    const gchar *photo_name = NULL;
    guchar *face_header_value = NULL;
    gsize face_header_len = 0;
    gchar *header_sender = NULL, *header_from = NULL, *name;
    gboolean mail_from_delegate = FALSE;
    gboolean show_sender_photo;
    gchar *hdr_charset;
    gchar *evolution_imagesdir;
    const gchar *direction;

    g_return_if_fail (E_IS_MAIL_PART_HEADERS (part));

    if (g_cancellable_is_cancelled (cancellable))
        return;

    mime_part = e_mail_part_ref_mime_part (part);

    switch (gtk_widget_get_default_direction ()) {
        case GTK_TEXT_DIR_RTL:
            direction = "rtl";
            break;
        case GTK_TEXT_DIR_LTR:
            direction = "ltr";
            break;
        default:
            direction = "inherit";
            break;
    }

    ct = camel_mime_part_get_content_type (mime_part);
    charset = camel_content_type_param (ct, "charset");
    charset = camel_iconv_charset_name (charset);
    hdr_charset = e_mail_formatter_dup_charset (formatter);
    if (!hdr_charset)
        hdr_charset = e_mail_formatter_dup_default_charset (formatter);

    evolution_imagesdir = g_filename_to_uri (EVOLUTION_IMAGESDIR, NULL, NULL);

    g_string_append_printf (
        buffer,
        "<table cellspacing=\"0\" cellpadding=\"0\" "
        "border=\"0\" width=\"100%%\" "
        "id=\"__evo-full-headers\" "
        "style=\"display: %s; direction: %s;\">",
        flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSED ? "none" : "table",
        direction);

    header = mime_part->headers;
    while (header != NULL) {
        if (!g_ascii_strcasecmp (header->name, "Sender")) {
            struct _camel_header_address *addrs;
            GString *html;

            if (!(addrs = camel_header_address_decode (header->value, hdr_charset)))
                break;

            html = g_string_new ("");
            name = e_mail_formatter_format_address (
                formatter, html, addrs, header->name, FALSE,
                ~(flags & E_MAIL_FORMATTER_HEADER_FLAG_NOELIPSIZE));

            header_sender = html->str;
            camel_header_address_list_clear (&addrs);

            g_string_free (html, FALSE);
            g_free (name);

        } else if (!g_ascii_strcasecmp (header->name, "From")) {
            struct _camel_header_address *addrs;
            GString *html;

            if (!(addrs = camel_header_address_decode (header->value, hdr_charset)))
                break;

            html = g_string_new ("");
            name = e_mail_formatter_format_address (
                formatter, html, addrs, header->name, FALSE,
                !(flags & E_MAIL_FORMATTER_HEADER_FLAG_NOELIPSIZE));

            header_from = html->str;
            camel_header_address_list_clear (&addrs);

            g_string_free (html, FALSE);
            g_free (name);

        } else if (!g_ascii_strcasecmp (header->name, "X-Evolution-Mail-From-Delegate")) {
            mail_from_delegate = TRUE;
        }

        header = header->next;
    }

    g_free (hdr_charset);

    if (header_sender && header_from && mail_from_delegate) {
        gchar *bold_sender, *bold_from;

        g_string_append (
            buffer,
            "<tr valign=\"top\"><td><table border=1 width=\"100%\" "
            "cellspacing=2 cellpadding=2><tr>");
        if (gtk_widget_get_default_direction () == GTK_TEXT_DIR_RTL)
            g_string_append (
                buffer, "<td align=\"right\" width=\"100%\">");
        else
            g_string_append (
                buffer, "<td align=\"left\" width=\"100%\">");
        bold_sender = g_strconcat ("<b>", header_sender, "</b>", NULL);
        bold_from = g_strconcat ("<b>", header_from, "</b>", NULL);
        /* Translators: This message suggests to the receipients
         * that the sender of the mail is different from the one
         * listed in From field. */
        g_string_append_printf (
            buffer,
            _("This message was sent by %s on behalf of %s"),
            bold_sender, bold_from);
        g_string_append (buffer, "</td></tr></table></td></tr>");
        g_free (bold_sender);
        g_free (bold_from);
    }

    g_free (header_sender);
    g_free (header_from);

    g_string_append (
        buffer,
        "<tr valign=\"top\"><td width=\"100%\">"
        "<table class=\"header\">\n");

    g_free (evolution_imagesdir);

    /* dump selected headers */
    if (mode & E_MAIL_FORMATTER_MODE_ALL_HEADERS) {
        header = mime_part->headers;
        while (header != NULL) {
            e_mail_formatter_format_header (
                formatter, buffer,
                header->name,
                header->value,
                E_MAIL_FORMATTER_HEADER_FLAG_NOCOLUMNS, charset);
            header = header->next;
        }
    } else {
        CamelMedium *medium;
        gchar **default_headers;
        guint ii, length = 0;

        medium = CAMEL_MEDIUM (mime_part);

        default_headers =
            e_mail_part_headers_dup_default_headers (
            E_MAIL_PART_HEADERS (part));
        if (default_headers != NULL)
            length = g_strv_length (default_headers);

        for (ii = 0; ii < length; ii++) {
            const gchar *header_name;
            const gchar *header_value = NULL;

            header_name = default_headers[ii];

            /* X-Evolution-Mailer is a pseudo-header and
             * requires special treatment to extract the
             * real header value. */
            if (g_ascii_strcasecmp (header_name, "X-Evolution-Mailer") == 0) {
                /* Check for "X-MimeOLE" last,
                 * as it's the least preferred. */
                if (header_value == NULL)
                    header_value = camel_medium_get_header (
                        medium, "X-Mailer");
                if (header_value == NULL)
                    header_value = camel_medium_get_header (
                        medium, "User-Agent");
                if (header_value == NULL)
                    header_value = camel_medium_get_header (
                        medium, "X-Newsreader");
                if (header_value == NULL)
                    header_value = camel_medium_get_header (
                        medium, "X-MimeOLE");
            } else {
                header_value = camel_medium_get_header (
                    medium, header_name);
            }

            if (header_value == NULL)
                continue;

            if (g_ascii_strcasecmp (header_name, "From") == 0)
                photo_name = header_value;

            if (g_ascii_strcasecmp (header_name, "Face") == 0) {
                if (face_header_value == NULL) {
                    const gchar *cp = header_value;

                    /* Skip over spaces */
                    while (*cp == ' ')
                        cp++;

                    face_header_value = g_base64_decode (
                        cp, &face_header_len);
                    face_header_value = g_realloc (
                        face_header_value,
                        face_header_len + 1);
                    face_header_value[face_header_len] = 0;
                }
                continue;
            }

            e_mail_formatter_format_header (
                formatter, buffer,
                header_name,
                header_value,
                0, charset);
        }

        g_strfreev (default_headers);
    }

    g_string_append (buffer, "</table></td>");

    show_sender_photo =
        e_mail_formatter_get_show_sender_photo (formatter);

    /* Prefer contact photos over archaic "Face" headers. */
    if (show_sender_photo && photo_name != NULL) {
        gchar *name;

        name = g_uri_escape_string (photo_name, NULL, FALSE);
        g_string_append (
            buffer,
            "<td align=\"right\" valign=\"top\">");
        g_string_append_printf (
            buffer,
            "<img src=\"mail://contact-photo?mailaddr=\" "
            "data-mailaddr=\"%s\" id=\"__evo-contact-photo\"/>",
            name);
        g_string_append (buffer, "</td>");

        g_free (name);

    } else if (face_header_value != NULL) {
        CamelMimePart *image_part;

        image_part = camel_mime_part_new ();
        camel_mime_part_set_content (
            image_part,
            (const gchar *) face_header_value,
            face_header_len, "image/png");

        g_string_append (
            buffer,
            "<td align=\"right\" valign=\"top\">");
        write_contact_picture (image_part, 48, buffer);
        g_string_append (buffer, "</td>");

        g_object_unref (image_part);
        g_free (face_header_value);
    }

    g_string_append (buffer, "</tr></table>");

    g_object_unref (mime_part);
}

static gboolean
emfe_headers_format (EMailFormatterExtension *extension,
                     EMailFormatter *formatter,
                     EMailFormatterContext *context,
                     EMailPart *part,
                     GOutputStream *stream,
                     GCancellable *cancellable)
{
    CamelMimePart *mime_part;
    GString *buffer;
    const gchar *direction;
    gboolean is_collapsable;
    gboolean is_collapsed;

    if (g_cancellable_is_cancelled (cancellable))
        return FALSE;

    mime_part = e_mail_part_ref_mime_part (part);
    if (mime_part == NULL)
        return FALSE;

    switch (gtk_widget_get_default_direction ()) {
        case GTK_TEXT_DIR_RTL:
            direction = "rtl";
            break;
        case GTK_TEXT_DIR_LTR:
            direction = "ltr";
            break;
        default:
            direction = "inherit";
            break;
    }

    is_collapsable =
        (context->flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSABLE);

    is_collapsed =
        (context->flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSED);

    buffer = g_string_new ("");

    g_string_append_printf (
        buffer,
        "%s id=\"%s\"><table class=\"-e-mail-formatter-header-color\" border=\"0\" width=\"100%%\" "
        "style=\"direction: %s\">"
        "<tr>",
        (context->mode != E_MAIL_FORMATTER_MODE_PRINTING) ?
            "<div class=\"headers -e-mail-formatter-body-color\"" :
            "<div class=\"headers\" style=\"background-color: #ffffff;\"",
        e_mail_part_get_id (part),
        direction);

    if (is_collapsable)
        g_string_append_printf (
            buffer,
            "<td valign=\"top\" width=\"16\">"
            "<img src=\"evo-file://%s/%s\" class=\"navigable\" "
            "     id=\"__evo-collapse-headers-img\" />"
            "</td>",
            EVOLUTION_IMAGESDIR,
            is_collapsed ? "plus.png" : "minus.png");

    g_string_append (buffer, "<td>");

    if (is_collapsable)
        format_short_headers (
            formatter,
            buffer, part,
            context->flags,
            cancellable);

    format_full_headers (
        formatter,
        buffer, part,
        context->mode,
        context->flags,
        cancellable);

    g_string_append (buffer, "</td>");

    g_string_append (buffer, "</tr></table></div>");

    g_output_stream_write_all (
        stream, buffer->str, buffer->len, NULL, cancellable, NULL);

    g_string_free (buffer, TRUE);

    g_object_unref (mime_part);

    return TRUE;
}

static void
e_mail_formatter_headers_class_init (EMailFormatterExtensionClass *class)
{
    class->mime_types = formatter_mime_types;
    class->priority = G_PRIORITY_LOW;
    class->format = emfe_headers_format;
}

static void
e_mail_formatter_headers_init (EMailFormatterExtension *extension)
{
}