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; 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_H
#include <config.h>
#endif

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

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

#include "e-mail-formatter-extension.h"
#include "e-mail-formatter-utils.h"
#include "e-mail-inline-filter.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,
                      CamelMedium *part,
                      guint32 flags,
                      GCancellable *cancellable)
{
    const gchar *charset;
    CamelContentType *ct;
    gchar *hdr_charset;
    gchar *evolution_imagesdir;
    gchar *subject = NULL;
    struct _camel_header_address *addrs = NULL;
    struct _camel_header_raw *header;
    GString *from;
    gboolean is_rtl;

    if (g_cancellable_is_cancelled (cancellable))
        return;

    ct = camel_mime_part_get_content_type ((CamelMimePart *) 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);
    from = g_string_new ("");

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

    header = ((CamelMimePart *) 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)
                g_string_printf (from, _("From: %s"), 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);

    is_rtl = gtk_widget_get_default_direction () == GTK_TEXT_DIR_RTL;
    if (is_rtl) {
        g_string_append_printf (
            buffer,
            "<tr><td width=\"100%%\" align=\"right\">%s%s%s <strong>%s</strong></td></tr>",
            from->len ? "(" : "", from->str, from->len ? ")" : "",
            subject ? subject : _("(no subject)"));
    } else {
        g_string_append_printf (
            buffer,
            "<tr><td><strong>%s</strong> %s%s%s</td></tr>",
            subject ? subject : _("(no subject)"),
            from->len ? "(" : "", from->str, from->len ? ")" : "");
    }

    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);
}

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

    ba = NULL;
    dw = camel_medium_get_content (CAMEL_MEDIUM (part));
    if (dw) {
        ba = camel_data_wrapper_get_byte_array (dw);
    }

    if (!ba || ba->len == 0) {

        if (camel_mime_part_get_filename (part)) {

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

        return;
    }

    b64 = g_base64_encode (ba->data, ba->len);
    ct = camel_mime_part_get_content_type (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 CamelMimePart *
load_picture_from_file (const gchar *mime_type,
                         const gchar *filename,
                         GCancellable *cancellable)
{
    CamelMimePart *part;
    CamelStream *stream;
    CamelDataWrapper *dw;
    gchar *basename;

    stream = camel_stream_fs_new_with_name (filename, O_RDONLY, 0, NULL);
    if (stream == NULL)
        return NULL;

    dw = camel_data_wrapper_new ();
    camel_data_wrapper_construct_from_stream_sync (
        dw, stream, cancellable, NULL);
    g_object_unref (stream);
    if (mime_type)
        camel_data_wrapper_set_mime_type (dw, mime_type);
    part = camel_mime_part_new ();
    camel_medium_set_content ((CamelMedium *) part, dw);
    g_object_unref (dw);
    basename = g_path_get_basename (filename);
    camel_mime_part_set_filename (part, basename);
    g_free (basename);

    return part;
}

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

    if (g_cancellable_is_cancelled (cancellable))
        return;

    ct = camel_mime_part_get_content_type ((CamelMimePart *) 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\" "
        "id=\"__evo-full-headers\" style=\"display: %s\" width=\"100%%\">",
        flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSED ? "none" : "block");

    header = ((CamelMimePart *) part)->headers;
    while (header) {
        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 border=0 cellpadding=\"0\">\n");

    g_free (evolution_imagesdir);

    /* dump selected headers */
    if (mode & E_MAIL_FORMATTER_MODE_ALL_HEADERS) {
        header = ((CamelMimePart *) part)->headers;
        while (header) {
            e_mail_formatter_format_header (
                formatter, buffer, part, header,
                E_MAIL_FORMATTER_HEADER_FLAG_NOCOLUMNS, charset);
            header = header->next;
        }
    } else {
        GQueue *headers_queue;
        GList *link;
        gint mailer_shown = FALSE;

        headers_queue = e_mail_formatter_dup_headers (formatter);
        link = g_queue_peek_head_link (headers_queue);

        while (link != NULL) {
            EMailFormatterHeader *h = link->data;
            gint mailer, face;

            header = ((CamelMimePart *) part)->headers;
            mailer = !g_ascii_strcasecmp (h->name, "X-Evolution-Mailer");
            face = !g_ascii_strcasecmp (h->name, "Face");

            while (header) {
                if (e_mail_formatter_get_show_sender_photo (formatter) &&
                    !photo_name && !g_ascii_strcasecmp (header->name, "From"))
                    photo_name = header->value;

                if (!mailer_shown && mailer && (
                    !g_ascii_strcasecmp (header->name, "X-Mailer") ||
                    !g_ascii_strcasecmp (header->name, "User-Agent") ||
                    !g_ascii_strcasecmp (header->name, "X-Newsreader") ||
                    !g_ascii_strcasecmp (header->name, "X-MimeOLE"))) {
                    struct _camel_header_raw xmailer, *use_header = NULL;

                    if (!g_ascii_strcasecmp (header->name, "X-MimeOLE")) {
                        for (use_header = header->next; use_header; use_header = use_header->next) {
                            if (!g_ascii_strcasecmp (use_header->name, "X-Mailer") ||
                                !g_ascii_strcasecmp (use_header->name, "User-Agent") ||
                                !g_ascii_strcasecmp (use_header->name, "X-Newsreader")) {
                                /* even we have X-MimeOLE, then use rather the standard one, when available */
                                break;
                            }
                        }
                    }

                    if (!use_header)
                        use_header = header;

                    xmailer.name = (gchar *) "X-Evolution-Mailer";
                    xmailer.value = use_header->value;
                    mailer_shown = TRUE;

                    e_mail_formatter_format_header (
                        formatter, buffer, part,
                        &xmailer, h->flags, charset);
                    if (strstr (use_header->value, "Evolution"))
                        have_icon = TRUE;
                } else if (!face_decoded && face && !g_ascii_strcasecmp (header->name, "Face")) {
                    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;
                    face_decoded = TRUE;
                /* Showing an encoded "Face" header makes little sense */
                } else if (!g_ascii_strcasecmp (header->name, h->name) && !face) {
                    e_mail_formatter_format_header (
                        formatter, buffer, part,
                        header, h->flags, charset);
                }

                header = header->next;
            }

            link = g_list_next (link);
        }

        g_queue_free_full (headers_queue, (GDestroyNotify) e_mail_formatter_header_free);
    }

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

    if (photo_name) {
        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);
    }

    if (!contact_has_photo && face_decoded) {
        CamelMimePart *part;

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

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

        g_object_unref (part);
        g_free (face_header_value);
    }

    if (have_icon) {
        GtkIconInfo *icon_info;
        CamelMimePart *iconpart = NULL;

        icon_info = gtk_icon_theme_lookup_icon (
                gtk_icon_theme_get_default (),
                "evolution", 16, GTK_ICON_LOOKUP_NO_SVG);
        if (icon_info != NULL) {
            iconpart = load_picture_from_file (
                "image/png", gtk_icon_info_get_filename (icon_info),
                cancellable);
            gtk_icon_info_free (icon_info);
        }
        if (iconpart) {
            g_string_append (buffer, "<td align=\"right\" valign=\"top\">");
            write_contact_picture (iconpart, 16, buffer);
            g_string_append (buffer, "</td>");

            g_object_unref (iconpart);
        }
    }

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

static gboolean
emfe_headers_format (EMailFormatterExtension *extension,
                     EMailFormatter *formatter,
                     EMailFormatterContext *context,
                     EMailPart *part,
                     CamelStream *stream,
                     GCancellable *cancellable)
{
    GString *buffer;
    gint bg_color;

    if (g_cancellable_is_cancelled (cancellable))
        return FALSE;

    if (!part->part)
        return FALSE;

    buffer = g_string_new ("");

    if (context->mode == E_MAIL_FORMATTER_MODE_PRINTING) {
        GdkColor white = { 0, G_MAXUINT16, G_MAXUINT16, G_MAXUINT16 };
        bg_color = e_color_to_value (&white);
    } else {
        bg_color = e_color_to_value ((GdkColor *)
                e_mail_formatter_get_color (
                    formatter, E_MAIL_FORMATTER_COLOR_BODY));
    }

    g_string_append_printf (
        buffer,
        "<div class=\"headers\" style=\"background: #%06x;\" id=\"%s\">"
        "<table border=\"0\" width=\"100%%\" style=\"color: #%06x;\">\n"
        "<tr><td valign=\"top\" width=\"16\">\n",
        bg_color,
        part->id,
        e_color_to_value ((GdkColor *)
            e_mail_formatter_get_color (
                formatter,
                E_MAIL_FORMATTER_COLOR_HEADER)));

    if (context->flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSABLE) {
        g_string_append_printf (
            buffer,
            "<img src=\"evo-file://%s/%s\" class=\"navigable\" "
            "id=\"__evo-collapse-headers-img\" />"
            "</td><td>",
            EVOLUTION_IMAGESDIR,
            (context->flags & E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSED) ?
                "plus.png" : "minus.png");

        format_short_headers (formatter, buffer,
            (CamelMedium *) part->part, context->flags, cancellable);
    }

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

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

    camel_stream_write_string (stream, buffer->str, cancellable, NULL);

    g_string_free (buffer, TRUE);

    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)
{
}