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/*
 * e-mail-formatter-print-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 <camel/camel.h>

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

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

typedef EMailFormatterExtension EMailFormatterPrintHeaders;
typedef EMailFormatterExtensionClass EMailFormatterPrintHeadersClass;

GType e_mail_formatter_print_headers_get_type (void);

G_DEFINE_TYPE (
    EMailFormatterPrintHeaders,
    e_mail_formatter_print_headers,
    E_TYPE_MAIL_FORMATTER_PRINT_EXTENSION)

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

static gboolean
emfpe_headers_format (EMailFormatterExtension *extension,
                      EMailFormatter *formatter,
                      EMailFormatterContext *context,
                      EMailPart *part,
                      CamelStream *stream,
                      GCancellable *cancellable)
{
    EMailPartHeaders *headers_part;
    GtkTreeModel *tree_model;
    GtkTreeIter iter;
    gboolean iter_valid;
    GString *str, *tmp;
    gchar *subject;
    const gchar *buf;
    gint attachments_count;
    gchar *part_id_prefix;
    CamelMimePart *mime_part;
    GQueue queue = G_QUEUE_INIT;
    GList *head, *link;
    const gchar *part_id;

    g_return_val_if_fail (E_IS_MAIL_PART_HEADERS (part), FALSE);

    mime_part = e_mail_part_ref_mime_part (part);

    buf = camel_medium_get_header (CAMEL_MEDIUM (mime_part), "subject");
    subject = camel_header_decode_string (buf, "UTF-8");
    str = g_string_new ("");
    g_string_append_printf (str, "<h1>%s</h1>\n", subject);
    g_free (subject);

    g_string_append (
        str,
        "<table border=\"0\" cellspacing=\"5\" "
        "cellpadding=\"0\" class=\"printing-header\">\n");

    headers_part = E_MAIL_PART_HEADERS (part);
    tree_model = e_mail_part_headers_ref_print_model (headers_part);
    iter_valid = gtk_tree_model_get_iter_first (tree_model, &iter);

    while (iter_valid) {
        gchar *header_name = NULL;
        gchar *header_value = NULL;
        gboolean include = FALSE;

        gtk_tree_model_get (
            tree_model, &iter,
            E_MAIL_PART_HEADERS_PRINT_MODEL_COLUMN_INCLUDE,
            &include,
            E_MAIL_PART_HEADERS_PRINT_MODEL_COLUMN_HEADER_NAME,
            &header_name,
            E_MAIL_PART_HEADERS_PRINT_MODEL_COLUMN_HEADER_VALUE,
            &header_value,
            -1);

        if (include)
            e_mail_formatter_format_header (
                formatter, str,
                header_name, header_value,
                E_MAIL_FORMATTER_HEADER_FLAG_NOLINKS,
                "UTF-8");

        g_free (header_name);
        g_free (header_value);

        iter_valid = gtk_tree_model_iter_next (tree_model, &iter);
    }

    g_object_unref (tree_model);

    /* Get prefix of this PURI */
    part_id = e_mail_part_get_id (part);
    part_id_prefix = g_strndup (part_id, g_strrstr (part_id, ".") - part_id);

    /* Add encryption/signature header */
    tmp = g_string_new ("");

    e_mail_part_list_queue_parts (context->part_list, NULL, &queue);

    head = g_queue_peek_head_link (&queue);

    /* Find first secured part. */
    for (link = head; link != NULL; link = g_list_next (link)) {
        EMailPart *mail_part = link->data;

        if (!e_mail_part_has_validity (mail_part))
            continue;

        if (!e_mail_part_id_has_prefix (mail_part, part_id_prefix))
            continue;

        if (e_mail_part_get_validity (mail_part, E_MAIL_PART_VALIDITY_PGP | E_MAIL_PART_VALIDITY_SIGNED)) {
            g_string_append (tmp, _("GPG signed"));
        }

        if (e_mail_part_get_validity (mail_part, E_MAIL_PART_VALIDITY_PGP | E_MAIL_PART_VALIDITY_ENCRYPTED)) {
            if (tmp->len > 0)
                g_string_append (tmp, ", ");
            g_string_append (tmp, _("GPG encrpyted"));
        }

        if (e_mail_part_get_validity (mail_part, E_MAIL_PART_VALIDITY_SMIME | E_MAIL_PART_VALIDITY_SIGNED)) {
            if (tmp->len > 0)
                g_string_append (tmp, ", ");
            g_string_append (tmp, _("S/MIME signed"));
        }

        if (e_mail_part_get_validity (mail_part, E_MAIL_PART_VALIDITY_SMIME | E_MAIL_PART_VALIDITY_ENCRYPTED)) {
            if (tmp->len > 0)
                g_string_append (tmp, ", ");
            g_string_append (tmp, _("S/MIME encrpyted"));
        }

        break;
    }

    if (tmp->len > 0) {
        e_mail_formatter_format_header (
            formatter, str,
            _("Security"), tmp->str,
            E_MAIL_FORMATTER_HEADER_FLAG_BOLD |
            E_MAIL_FORMATTER_HEADER_FLAG_NOLINKS, "UTF-8");
    }
    g_string_free (tmp, TRUE);

    /* Count attachments and display the number as a header */
    attachments_count = 0;

    for (link = head; link != NULL; link = g_list_next (link)) {
        EMailPart *mail_part = E_MAIL_PART (link->data);

        if (!e_mail_part_id_has_prefix (mail_part, part_id_prefix))
            continue;

        if (!e_mail_part_get_is_attachment (mail_part))
            continue;

        if (mail_part->is_hidden)
            continue;

        if (e_mail_part_get_cid (mail_part) != NULL)
            continue;

        attachments_count++;
    }

    if (attachments_count > 0) {
        gchar *header_value;

        header_value = g_strdup_printf ("%d", attachments_count);
        e_mail_formatter_format_header (
            formatter, str,
            _("Attachments"), header_value,
            E_MAIL_FORMATTER_HEADER_FLAG_BOLD |
            E_MAIL_FORMATTER_HEADER_FLAG_NOLINKS, "UTF-8");
        g_free (header_value);
    }

    while (!g_queue_is_empty (&queue))
        g_object_unref (g_queue_pop_head (&queue));

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

    camel_stream_write_string (stream, str->str, cancellable, NULL);
    g_string_free (str, TRUE);
    g_free (part_id_prefix);

    g_object_unref (mime_part);

    return TRUE;
}

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

static void
e_mail_formatter_print_headers_init (EMailFormatterExtension *extension)
{
}