path: root/plugins/email-custom-header/email-custom-header.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/>
 *
 *
 * Authors:
 *      Ashish Shrivastava <shashish@novell.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

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

#include "mail/em-utils.h"
#include "mail/em-event.h"
#include "composer/e-msg-composer.h"
#include "email-custom-header.h"

#define d(x)

#define ECM_SETTINGS_ID  "org.gnome.evolution.plugin.email-custom-header"
#define ECM_SETTINGS_KEY "custom-header"

#define CUSTOM_HEADER_OPTIONS_DIALOG_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), EMAIL_CUSTOM_HEADER_OPTIONS_DIALOG, CustomHeaderOptionsDialogPrivate))

typedef struct {
    GtkWidget *treeview;
    GtkWidget *header_add;
    GtkWidget *header_edit;
    GtkWidget *header_remove;
    GtkListStore *store;
} ConfigData;

enum {
    HEADER_KEY_COLUMN,
    HEADER_VALUE_COLUMN,
    HEADER_N_COLUMNS
};

struct _CustomHeaderOptionsDialogPrivate {
    GtkBuilder *builder;
    /*Widgets*/
    GtkWidget *main;
    GtkWidget *page;
    GtkWidget *header_table;
    GtkWidget *header_type_name_label;
    GArray *combo_box_header_value;
    GArray *email_custom_header_details;
    GArray *header_index_type;
    gint flag;
    gchar *help_section;
};

/* epech - e-plugin email custom header*/
GType custom_header_options_dialog_get_type (void);
static void epech_dialog_finalize (GObject *object);
static void epech_setup_widgets (CustomHeaderOptionsDialog *mch);
static gint epech_check_existing_composer_window (gconstpointer a, gconstpointer b);
static void commit_changes (ConfigData *cd);
gint e_plugin_lib_enable (EPlugin *ep, gint enable);
GtkWidget *e_plugin_lib_get_configure_widget (EPlugin *epl);
gboolean e_plugin_ui_init (GtkUIManager *ui_manager, EMsgComposer *composer);
GtkWidget *org_gnome_email_custom_header_config_option (EPlugin *epl, struct _EConfigHookItemFactoryData *data);

G_DEFINE_TYPE (
    CustomHeaderOptionsDialog,
    custom_header_options_dialog,
    G_TYPE_OBJECT)

gint
e_plugin_lib_enable (EPlugin *ep,
                     gint enable)
{
    return 0;
}

static void
epech_get_widgets_data (CustomHeaderOptionsDialog *mch)
{
    CustomHeaderOptionsDialogPrivate *priv;
    HeaderValueComboBox *sub_combo_box_get;
    gint selected_item;
    gint index_column;

    priv = mch->priv;
    priv->header_index_type = g_array_new (FALSE, FALSE, sizeof (gint));
    priv->flag++;

    for (index_column = 0;
        index_column < priv->email_custom_header_details->len; index_column++) {

        sub_combo_box_get = &g_array_index (priv->combo_box_header_value, HeaderValueComboBox,index_column);
        selected_item = gtk_combo_box_get_active ((GtkComboBox *) sub_combo_box_get->header_value_combo_box);
        g_array_append_val (priv->header_index_type, selected_item);
    }
}

static gboolean
epech_get_widgets (CustomHeaderOptionsDialog *mch)
{
    CustomHeaderOptionsDialogPrivate *priv;
    priv = mch->priv;

#define EMAIL_CUSTOM_HEADER(name) e_builder_get_widget (priv->builder, name)
    priv->main = EMAIL_CUSTOM_HEADER ("email-custom-header-dialog");

    if (!priv->main)
        return FALSE;

    priv->page  = EMAIL_CUSTOM_HEADER ("email-custom-header-vbox");
    priv->header_table = EMAIL_CUSTOM_HEADER ("email-custom-header-options");
#undef EMAIL_CUSTOM_HEADER

    return (priv->page
        &&priv->header_table);
}

static void
epech_fill_widgets_with_data (CustomHeaderOptionsDialog *mch)
{
    CustomHeaderOptionsDialogPrivate *priv;
    HeaderValueComboBox *sub_combo_box_fill;
    gint set_index_column;

    priv = mch->priv;
    priv->help_section = g_strdup ("mail-composer-custom-header-lines");

    for (set_index_column = 0;
        set_index_column < priv->email_custom_header_details->len; set_index_column++) {
        sub_combo_box_fill = &g_array_index (priv->combo_box_header_value, HeaderValueComboBox,set_index_column);

        if (priv->flag == 0) {
            gtk_combo_box_set_active ((GtkComboBox *) sub_combo_box_fill->header_value_combo_box,0);
        } else {
            gtk_combo_box_set_active (
                (GtkComboBox *) sub_combo_box_fill->header_value_combo_box,
                g_array_index (priv->header_index_type, gint, set_index_column));
        }
    }
}

CustomHeaderOptionsDialog *
epech_dialog_new (void)
{
    return g_object_new (EMAIL_CUSTOM_HEADER_OPTIONS_DIALOG, NULL);
}

static void
epech_header_options_cb (GtkDialog *dialog,
                         gint state,
                         gpointer func_data)
{
    CustomHeaderOptionsDialogPrivate *priv;
    CustomHeaderOptionsDialog *mch;

    mch = func_data;
    priv = mch->priv;

    switch (state) {
        case GTK_RESPONSE_OK:
            epech_get_widgets_data (mch);
        case GTK_RESPONSE_CANCEL:
            gtk_widget_hide (priv->main);
            gtk_widget_destroy (priv->main);
            g_object_unref (priv->builder);
            break;
        case GTK_RESPONSE_HELP:
            e_display_help (
                GTK_WINDOW (priv->main),
                priv->help_section);
            break;
    }

    g_signal_emit (func_data, signals[MCH_RESPONSE], 0, state);
}

static gboolean
epech_dialog_run (CustomHeaderOptionsDialog *mch,
                  GtkWidget *parent)
{
    CustomHeaderOptionsDialogPrivate *priv;
    GSettings *settings;
    GtkWidget *toplevel;

    g_return_val_if_fail (mch != NULL || EMAIL_CUSTOM_HEADER_OPTIONS_IS_DIALOG (mch), FALSE);
    priv = mch->priv;

    settings = g_settings_new (ECM_SETTINGS_ID);
    epech_load_from_settings (settings, ECM_SETTINGS_KEY, mch);
    g_object_unref (settings);

    priv->builder = gtk_builder_new ();
    e_load_ui_builder_definition (
        priv->builder, "org-gnome-email-custom-header.ui");

    if (!epech_get_widgets (mch)) {
        g_object_unref (priv->builder);
        d (printf ("\n Could not get the Widgets\n"));
    }

    epech_setup_widgets (mch);
    toplevel =  gtk_widget_get_toplevel (priv->main);

    if (parent)
        gtk_window_set_transient_for (GTK_WINDOW (toplevel),GTK_WINDOW (parent));

    epech_fill_widgets_with_data (mch);
    g_signal_connect (
        priv->main, "response",
        G_CALLBACK (epech_header_options_cb), mch);
    gtk_widget_show (priv->main);

    return TRUE;
}

static void
epech_load_from_settings (GSettings *settings,
                          const gchar *key,
                          CustomHeaderOptionsDialog *mch)
{
    CustomHeaderOptionsDialogPrivate *priv;
    EmailCustomHeaderDetails temp_header_details= {-1, -1, NULL, NULL};
    CustomSubHeader temp_header_value_details =  {NULL};
    gchar **headers;
    gint index,pos;

    priv = mch->priv;
    priv->email_custom_header_details = g_array_new (TRUE, TRUE, sizeof (EmailCustomHeaderDetails));
    headers = g_settings_get_strv (settings, key);

    for (pos = 0; headers && headers[pos]; pos++) {
        gchar **parse_header_list;

        memset (&temp_header_value_details, 0, sizeof (CustomSubHeader));
        temp_header_details.sub_header_type_value = g_array_new (TRUE, TRUE, sizeof (CustomSubHeader));
        parse_header_list = g_strsplit_set (headers[pos], "=;,", -1);
        temp_header_details.header_type_value = g_string_new ("");
        if (temp_header_details.header_type_value) {
            g_string_assign (temp_header_details.header_type_value, parse_header_list[0]);
        }

        for (index = 0; parse_header_list[index + 1] ; ++index) {
            temp_header_value_details.sub_header_string_value = g_string_new ("");

            if (temp_header_value_details.sub_header_string_value) {
                g_string_assign (temp_header_value_details.sub_header_string_value, parse_header_list[index + 1]);
            }

            g_array_append_val (temp_header_details.sub_header_type_value, temp_header_value_details);
        }

        temp_header_details.number_of_subtype_header = index;
        g_array_append_val (priv->email_custom_header_details, temp_header_details);
    }

    temp_header_details.number_of_header = pos;

    g_strfreev (headers);
}

static void
epech_setup_widgets (CustomHeaderOptionsDialog *mch)
{
    CustomHeaderOptionsDialogPrivate *priv;
    EmailCustomHeaderDetails *temp_header_ptr,*temp;
    CustomSubHeader *temp_header_value_ptr;
    HeaderValueComboBox sub_combo_box = {NULL};
    HeaderValueComboBox *sub_combo_box_ptr;
    gint sub_index,row_combo,column_combo;
    gint header_section_id,sub_type_index,row,column;
    gint i;
    const gchar *str;
    static const gchar *security_field = NC_("email-custom-header-Security", "Security:");
    static struct _security_values {
        const gchar *value, *str;
    } security_values[] = {
        { "Personal",     NC_("email-custom-header-Security", "Personal") } ,
        { "Unclassified", NC_("email-custom-header-Security", "Unclassified") },
        { "Protected",    NC_("email-custom-header-Security", "Protected") },
        { "InConfidence", NC_("email-custom-header-Security", "Confidential") },
        { "Secret",       NC_("email-custom-header-Security", "Secret") },
        { "Topsecret",    NC_("email-custom-header-Security", "Top secret") },
        { NULL, NULL }
    };

    priv = mch->priv;
    priv->combo_box_header_value = g_array_new (TRUE, FALSE, sizeof (HeaderValueComboBox));

    for (header_section_id = 0,row = 0,column = 1;
        header_section_id < priv->email_custom_header_details->len; header_section_id++,row++,column++) {

        /* To create an empty label widget. Text will be added dynamically. */
        priv->header_type_name_label = gtk_label_new ("");
        temp_header_ptr = &g_array_index (priv->email_custom_header_details, EmailCustomHeaderDetails,header_section_id);
        str = (temp_header_ptr->header_type_value)->str;
        if (strcmp (str, security_field) == 0)
            str = g_dpgettext2 (GETTEXT_PACKAGE, "email-custom-header-Security", security_field);
        gtk_label_set_markup (GTK_LABEL (priv->header_type_name_label), str);

        gtk_table_attach (
            GTK_TABLE (priv->header_table),
            priv->header_type_name_label, 0, 1, row, column,
            (GtkAttachOptions) (GTK_EXPAND | GTK_FILL),
            (GtkAttachOptions) (0), 0, 0);

        gtk_misc_set_alignment (GTK_MISC (priv->header_type_name_label), 0, 0.5);
        gtk_widget_show (priv->header_type_name_label);
        sub_combo_box.header_value_combo_box = gtk_combo_box_text_new ();
        g_array_append_val (priv->combo_box_header_value, sub_combo_box);
    }

    for (sub_index = 0,row_combo = 0,column_combo = 1; sub_index < priv->combo_box_header_value->len;
        sub_index++,row_combo++,column_combo++) {
        temp = &g_array_index (priv->email_custom_header_details, EmailCustomHeaderDetails,sub_index);

        sub_combo_box_ptr = &g_array_index (priv->combo_box_header_value, HeaderValueComboBox,sub_index);
        gtk_table_attach (
            GTK_TABLE (priv->header_table),
            sub_combo_box_ptr->header_value_combo_box, 1, 2, row_combo, column_combo,
            (GtkAttachOptions) (GTK_EXPAND | GTK_FILL),
            (GtkAttachOptions) (GTK_FILL), 0, 0);

        for (sub_type_index = 0; sub_type_index < temp->number_of_subtype_header; sub_type_index++) {
            temp_header_value_ptr = &g_array_index (temp->sub_header_type_value, CustomSubHeader,sub_type_index);
            str = (temp_header_value_ptr->sub_header_string_value)->str;
            for (i = 0; security_values[i].value != NULL; i++) {
                if (strcmp (str, security_values[i].value) == 0) {
                    str = g_dpgettext2 (GETTEXT_PACKAGE, "email-custom-header-Security", security_values[i].str);
                    break;
                }
            }
            gtk_combo_box_text_append_text (
                GTK_COMBO_BOX_TEXT (
                sub_combo_box_ptr->header_value_combo_box), str);
        }

        /* Translators: "None" as an email custom header option in a dialog invoked by Insert->Custom Header from Composer,
         * indicating the header will not be added to a mail message */
        gtk_combo_box_text_append_text (
            GTK_COMBO_BOX_TEXT (
            sub_combo_box_ptr->header_value_combo_box),
            C_("email-custom-header", "None"));
        gtk_widget_show (sub_combo_box_ptr->header_value_combo_box);
    }
}

static void
custom_header_options_dialog_class_init (CustomHeaderOptionsDialogClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (
        class, sizeof (CustomHeaderOptionsDialogPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->finalize = epech_dialog_finalize;

    signals[MCH_RESPONSE] = g_signal_new (
        "emch_response",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_FIRST,
        G_STRUCT_OFFSET (CustomHeaderOptionsDialogClass, emch_response),
        NULL, NULL,
        g_cclosure_marshal_VOID__INT,
        G_TYPE_NONE, 1,
        G_TYPE_INT);
}

static void
custom_header_options_dialog_init (CustomHeaderOptionsDialog *mch)
{
    mch->priv = CUSTOM_HEADER_OPTIONS_DIALOG_GET_PRIVATE (mch);
}

static void
epech_dialog_finalize (GObject *object)
{
    CustomHeaderOptionsDialogPrivate *priv;

    priv = CUSTOM_HEADER_OPTIONS_DIALOG_GET_PRIVATE (object);

    g_free (priv->help_section);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (custom_header_options_dialog_parent_class)->finalize (object);
}

static void
epech_append_to_custom_header (CustomHeaderOptionsDialog *dialog,
                               gint state,
                               gpointer data)
{
    EMsgComposer *composer;
    CustomHeaderOptionsDialogPrivate *priv;
    EmailCustomHeaderDetails *temp_header_ptr;
    CustomSubHeader *temp_header_value_ptr;
    gint index_subtype,sub_type_index;

    composer = (EMsgComposer *) data;
    priv = dialog->priv;

    if (state == GTK_RESPONSE_OK) {

        for (index_subtype = 0; index_subtype < priv->email_custom_header_details->len; index_subtype++) {

            temp_header_ptr = &g_array_index (priv->email_custom_header_details, EmailCustomHeaderDetails,index_subtype);

            for (sub_type_index = 0; sub_type_index < temp_header_ptr->number_of_subtype_header; sub_type_index++) {
                temp_header_value_ptr = &g_array_index (temp_header_ptr->sub_header_type_value, CustomSubHeader,sub_type_index);

                if (sub_type_index == g_array_index (priv->header_index_type, gint, index_subtype)) {
                    e_msg_composer_set_header (
                        composer, (temp_header_ptr->header_type_value)->str,
                        (temp_header_value_ptr->sub_header_string_value)->str);
                }
            }
        }
    }
}

static void
epech_custom_header_options_commit (EMsgComposer *comp,
                                    gpointer user_data)
{
    EMsgComposer *composer;
    EmailCustomHeaderWindow *new_email_custom_header_window = NULL;
    CustomHeaderOptionsDialog *current_dialog = NULL;

    composer = (EMsgComposer *) user_data;

    if (!user_data || !EMAIL_CUSTOM_HEADER_OPTIONS_IS_DIALOG (user_data))
        return;

    new_email_custom_header_window = g_object_get_data ((GObject *) composer, "compowindow");

    if (new_email_custom_header_window) {
        current_dialog = new_email_custom_header_window->epech_dialog;
    }

    if (current_dialog) {
        g_free (current_dialog);
        current_dialog = NULL;
    }

    if (new_email_custom_header_window) {
        g_free (new_email_custom_header_window);
        new_email_custom_header_window = NULL;
    }
}

static gint
epech_check_existing_composer_window (gconstpointer compowindow,
                                      gconstpointer other_compowindow)
{
    if ((compowindow) && (other_compowindow)) {
        if (((EmailCustomHeaderWindow *) compowindow)->epech_window == (GdkWindow *) other_compowindow) {
            return 0;
        }
    }

    return -1;
}

static void
destroy_compo_data (gpointer data)
{
    EmailCustomHeaderWindow *compo_data = (EmailCustomHeaderWindow *) data;

    if (!compo_data)
        return;

    g_free (compo_data);
}

static void
action_email_custom_header_cb (GtkAction *action,
                               EMsgComposer *composer)

{
    GtkUIManager *ui_manager;
    GtkWidget *menuitem;
    GdkWindow *window;
    CustomHeaderOptionsDialog *dialog = NULL;
    EmailCustomHeaderWindow *new_email_custom_header_window = NULL;

    ui_manager = gtkhtml_editor_get_ui_manager (GTKHTML_EDITOR (composer));
    menuitem = gtk_ui_manager_get_widget (ui_manager, "/main-menu/insert-menu/insert-menu-top/Custom Header");

    new_email_custom_header_window = g_object_get_data ((GObject *) composer, "compowindow");

    window = gtk_widget_get_window (menuitem);
    if (epech_check_existing_composer_window (new_email_custom_header_window,window) == 0) {
        dialog = new_email_custom_header_window->epech_dialog;
    } else {
        dialog = epech_dialog_new ();
        if (dialog) {
            EmailCustomHeaderWindow *new_email_custom_header_window;
            new_email_custom_header_window = g_new0 (EmailCustomHeaderWindow, 1);
            new_email_custom_header_window->epech_window = window;
            new_email_custom_header_window->epech_dialog = dialog;
            g_object_set_data_full ((GObject *) composer, "compowindow", new_email_custom_header_window, destroy_compo_data);
        }
    }

    epech_dialog_run (dialog, GTK_WIDGET (composer));
    g_signal_connect (
        dialog, "emch_response",
        G_CALLBACK (epech_append_to_custom_header), composer);
    g_signal_connect (
        composer, "destroy",
        G_CALLBACK (epech_custom_header_options_commit), composer);
}

static GtkActionEntry entries[] = {

    { "Custom Header",
      NULL,
      N_("_Custom Header"),
      NULL,
      NULL,
      G_CALLBACK (action_email_custom_header_cb) }
};

gboolean
e_plugin_ui_init (GtkUIManager *ui_manager,
                  EMsgComposer *composer)
{
    GtkhtmlEditor *editor;

    editor = GTKHTML_EDITOR (composer);

    /* Add actions to the "composer" action group. */
    gtk_action_group_add_actions (
        gtkhtml_editor_get_action_group (editor, "composer"),
        entries, G_N_ELEMENTS (entries), composer);

    return TRUE;
}

static void
commit_changes (ConfigData *cd)
{
    GtkTreeModel *model = NULL;
    GPtrArray *headers;
    GtkTreeIter iter;
    gboolean valid;
    GSettings *settings;

    headers = g_ptr_array_new_full (3, g_free);

    model = gtk_tree_view_get_model (GTK_TREE_VIEW (cd->treeview));
    valid = gtk_tree_model_get_iter_first (model, &iter);

    while (valid) {
        gchar *keyword = NULL, *value = NULL;

        gtk_tree_model_get (
            model, &iter,
            HEADER_KEY_COLUMN, &keyword,
            HEADER_VALUE_COLUMN, &value,
            -1);

                /* Check if the keyword is not empty */
        if ((keyword) && (g_utf8_strlen (g_strstrip (keyword), -1) > 0)) {
            if ((value) && (g_utf8_strlen (g_strstrip (value), -1) > 0)) {
                gchar *tmp = keyword;

                keyword = g_strconcat (keyword, "=", value, NULL);
                g_free (tmp);
            }
            g_ptr_array_add (headers, g_strdup (keyword));
        }

        g_free (keyword);
        g_free (value);

        valid = gtk_tree_model_iter_next (model, &iter);
    }

    g_ptr_array_add (headers, NULL);

    settings = g_settings_new (ECM_SETTINGS_ID);
    g_settings_set_strv (settings, ECM_SETTINGS_KEY, (const gchar * const *) headers->pdata);
    g_object_unref (settings);

    g_ptr_array_free (headers, TRUE);
}

static void
cell_edited_cb (GtkCellRendererText *cell,
                gchar *path_string,
                gchar *new_text,
                ConfigData *cd)
{
    GtkTreeModel *model;
    GtkTreeIter iter;

    model = gtk_tree_view_get_model (GTK_TREE_VIEW (cd->treeview));
    gtk_tree_model_get_iter_from_string (model, &iter, path_string);

    if (new_text == NULL || *g_strstrip (new_text) == '\0')
        gtk_button_clicked (GTK_BUTTON (cd->header_remove));
    else {
        gtk_list_store_set (
            GTK_LIST_STORE (model), &iter,
            HEADER_KEY_COLUMN, new_text, -1);
        commit_changes (cd);
    }
}

static void
cell_editing_canceled_cb (GtkCellRenderer *cell,
                          ConfigData *cd)
{
    gtk_button_clicked (GTK_BUTTON (cd->header_remove));
}

static void
cell_value_edited_cb (GtkCellRendererText *cell,
                      gchar *path_string,
                      gchar *new_text,
                      ConfigData *cd)
{
    GtkTreeModel *model;
    GtkTreeIter iter;

    model = gtk_tree_view_get_model (GTK_TREE_VIEW (cd->treeview));

    gtk_tree_model_get_iter_from_string (model, &iter, path_string);

    gtk_list_store_set (
        GTK_LIST_STORE (model), &iter,
        HEADER_VALUE_COLUMN, new_text, -1);

    commit_changes (cd);
}

static void
header_add_clicked (GtkButton *button,
                    ConfigData *cd)
{
    GtkTreeModel *model;
    GtkTreeView *tree_view;
    GtkTreeViewColumn *column;
    GtkTreePath *path;
    GtkTreeIter iter;

    tree_view = GTK_TREE_VIEW (cd->treeview);
    model = gtk_tree_view_get_model (tree_view);

    gtk_list_store_append (GTK_LIST_STORE (model), &iter);

    path = gtk_tree_model_get_path (model, &iter);
    column = gtk_tree_view_get_column (tree_view, HEADER_KEY_COLUMN);
    gtk_tree_view_set_cursor (tree_view, path, column, TRUE);
    gtk_tree_view_row_activated (tree_view, path, column);
    gtk_tree_path_free (path);
}

static void
header_remove_clicked (GtkButton *button,
                       ConfigData *cd)
{
    GtkTreeSelection *selection;
    GtkTreeModel *model;
    GtkTreeIter iter;
    GtkTreePath *path;
    gboolean valid;
    gint len;

    valid = FALSE;
    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (cd->treeview));
    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
        return;

    /* Get the path and move to the previous node :) */
    path = gtk_tree_model_get_path (model, &iter);
    if (path)
        valid = gtk_tree_path_prev (path);

    gtk_list_store_remove (GTK_LIST_STORE (model), &iter);

    len = gtk_tree_model_iter_n_children (model, NULL);
    if (len > 0) {
        if (gtk_list_store_iter_is_valid (GTK_LIST_STORE (model), &iter)) {
            gtk_tree_selection_select_iter (selection, &iter);
        } else {
            if (path && valid) {
                gtk_tree_model_get_iter (model, &iter, path);
                gtk_tree_selection_select_iter (selection, &iter);
            }
        }
    } else {
        gtk_widget_set_sensitive (cd->header_edit, FALSE);
        gtk_widget_set_sensitive (cd->header_remove, FALSE);
    }

    gtk_widget_grab_focus (cd->treeview);
    gtk_tree_path_free (path);

    commit_changes (cd);
}

static void
header_edit_clicked (GtkButton *button,
                     ConfigData *cd)
{
    GtkTreeSelection *selection;
    GtkTreeModel *model;
    GtkTreePath *path;
    GtkTreeIter iter;
    GtkTreeViewColumn *focus_col;

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (cd->treeview));
    if (!gtk_tree_selection_get_selected (selection, &model, &iter))
        return;

    focus_col = gtk_tree_view_get_column (GTK_TREE_VIEW (cd->treeview), HEADER_KEY_COLUMN);
    path = gtk_tree_model_get_path (model, &iter);

    if (path) {
        gtk_tree_view_set_cursor (GTK_TREE_VIEW (cd->treeview), path, focus_col, TRUE);
        gtk_tree_path_free (path);
    }
}

static void
selection_changed (GtkTreeSelection *selection,
                   ConfigData *cd)
{
    GtkTreeModel *model;
    GtkTreeIter iter;

    if (gtk_tree_selection_get_selected (selection, &model, &iter)) {
        gtk_widget_set_sensitive (cd->header_edit, TRUE);
        gtk_widget_set_sensitive (cd->header_remove, TRUE);
    } else {
        gtk_widget_set_sensitive (cd->header_edit, FALSE);
        gtk_widget_set_sensitive (cd->header_remove, FALSE);
    }
}

static void
destroy_cd_data (gpointer data)
{
    ConfigData *cd = (ConfigData *) data;

    if (!cd)
        return;

    g_free (cd);
}

GtkWidget *
e_plugin_lib_get_configure_widget (EPlugin *epl)
{
    GtkCellRenderer *renderer;
    GtkTreeSelection *selection;
    GtkTreeIter iter;
    GtkWidget *hbox;
    gchar **headers;
    gint index;
    GtkTreeViewColumn *col;
    gint col_pos;
    GSettings *settings;
    ConfigData *cd = g_new0 (ConfigData, 1);

    GtkWidget *ech_configuration_box;
    GtkWidget *vbox2;
    GtkWidget *label1;
    GtkWidget *header_configuration_box;
    GtkWidget *header_container;
    GtkWidget *scrolledwindow1;
    GtkWidget *header_treeview;
    GtkWidget *vbuttonbox1;
    GtkWidget *header_add;
    GtkWidget *header_edit;
    GtkWidget *header_remove;

    ech_configuration_box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
    gtk_widget_show (ech_configuration_box);

    vbox2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
    gtk_widget_show (vbox2);
    gtk_box_pack_start (GTK_BOX (ech_configuration_box), vbox2, FALSE, FALSE, 0);

    /* To translators: This string is used while adding a new message header to configuration, to specifying the format of the key values */
    label1 = gtk_label_new (_("The format for specifying a Custom Header key value is:\nName of the Custom Header key values separated by \";\"."));
    gtk_widget_show (label1);
    gtk_box_pack_start (GTK_BOX (vbox2), label1, FALSE, TRUE, 0);
    gtk_label_set_justify (GTK_LABEL (label1), GTK_JUSTIFY_CENTER);
    gtk_label_set_line_wrap (GTK_LABEL (label1), TRUE);

    header_configuration_box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
    gtk_widget_show (header_configuration_box);
    gtk_box_pack_start (GTK_BOX (ech_configuration_box), header_configuration_box, TRUE, TRUE, 0);

    header_container = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
    gtk_widget_show (header_container);
    gtk_box_pack_start (GTK_BOX (header_configuration_box), header_container, TRUE, TRUE, 0);

    scrolledwindow1 = gtk_scrolled_window_new (NULL, NULL);
    gtk_widget_show (scrolledwindow1);
    gtk_box_pack_start (GTK_BOX (header_container), scrolledwindow1, TRUE, TRUE, 0);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow1), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

    header_treeview = gtk_tree_view_new ();
    gtk_widget_show (header_treeview);
    gtk_container_add (GTK_CONTAINER (scrolledwindow1), header_treeview);
    gtk_container_set_border_width (GTK_CONTAINER (header_treeview), 1);

    vbuttonbox1 = gtk_button_box_new (GTK_ORIENTATION_VERTICAL);
    gtk_widget_show (vbuttonbox1);
    gtk_box_pack_start (GTK_BOX (header_container), vbuttonbox1, FALSE, TRUE, 0);
    gtk_button_box_set_layout (GTK_BUTTON_BOX (vbuttonbox1), GTK_BUTTONBOX_START);
    gtk_box_set_spacing (GTK_BOX (vbuttonbox1), 6);

    header_add = gtk_button_new_from_stock ("gtk-add");
    gtk_widget_show (header_add);
    gtk_container_add (GTK_CONTAINER (vbuttonbox1), header_add);
    gtk_widget_set_can_default (header_add, TRUE);

    header_edit = gtk_button_new_from_stock ("gtk-edit");
    gtk_widget_show (header_edit);
    gtk_container_add (GTK_CONTAINER (vbuttonbox1), header_edit);
    gtk_widget_set_can_default (header_edit, TRUE);

    header_remove = gtk_button_new_from_stock ("gtk-remove");
    gtk_widget_show (header_remove);
    gtk_container_add (GTK_CONTAINER (vbuttonbox1), header_remove);
    gtk_widget_set_can_default (header_remove, TRUE);

    cd->treeview = header_treeview;

    cd->store = gtk_list_store_new (HEADER_N_COLUMNS, G_TYPE_STRING, G_TYPE_STRING);

    gtk_tree_view_set_model (GTK_TREE_VIEW (cd->treeview), GTK_TREE_MODEL (cd->store));

    renderer = gtk_cell_renderer_text_new ();
    col_pos = gtk_tree_view_insert_column_with_attributes (
        GTK_TREE_VIEW (cd->treeview), -1, _("Key"),
        renderer, "text", HEADER_KEY_COLUMN, NULL);
    col = gtk_tree_view_get_column (GTK_TREE_VIEW (cd->treeview), col_pos -1);
    gtk_tree_view_column_set_resizable (col, TRUE);
    gtk_tree_view_column_set_reorderable (col, TRUE);
    g_object_set (col, "min-width", 50, NULL);

    g_object_set (renderer, "editable", TRUE, NULL);
    g_signal_connect (
        renderer, "edited",
        G_CALLBACK (cell_edited_cb), cd);
    g_signal_connect (
        renderer, "editing-canceled",
        G_CALLBACK (cell_editing_canceled_cb), cd);

    renderer = gtk_cell_renderer_text_new ();
    col_pos = gtk_tree_view_insert_column_with_attributes (
        GTK_TREE_VIEW (cd->treeview), -1, _("Values"),
            renderer, "text", HEADER_VALUE_COLUMN, NULL);
    col = gtk_tree_view_get_column (GTK_TREE_VIEW (cd->treeview), col_pos -1);
    gtk_tree_view_column_set_resizable (col, TRUE);
    gtk_tree_view_column_set_reorderable (col, TRUE);
    g_object_set (renderer, "editable", TRUE, NULL);

    g_signal_connect (
        renderer, "edited",
        G_CALLBACK (cell_value_edited_cb), cd);

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (cd->treeview));
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_SINGLE);
    g_signal_connect (
        selection, "changed",
        G_CALLBACK (selection_changed), cd);
    gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (cd->treeview), TRUE);

    cd->header_add = header_add;
    g_signal_connect (
        cd->header_add, "clicked",
        G_CALLBACK (header_add_clicked), cd);

    cd->header_remove = header_remove;
    g_signal_connect (
        cd->header_remove, "clicked",
        G_CALLBACK (header_remove_clicked), cd);
    gtk_widget_set_sensitive (cd->header_remove, FALSE);

    cd->header_edit = header_edit;
    g_signal_connect (
        cd->header_edit, "clicked",
        G_CALLBACK (header_edit_clicked), cd);
    gtk_widget_set_sensitive (cd->header_edit, FALSE);

    /* Populate tree view with values from settings */
    settings = g_settings_new (ECM_SETTINGS_ID);
    headers = g_settings_get_strv (settings, ECM_SETTINGS_KEY);
    g_object_unref (settings);

    if (headers) {
        gint ii;

        for (ii = 0; headers[ii]; ii++) {
            gchar **parse_header_list;

            gtk_list_store_append (cd->store, &iter);

            parse_header_list = g_strsplit_set (headers[ii], "=,", -1);

            gtk_list_store_set (cd->store, &iter, HEADER_KEY_COLUMN, parse_header_list[0], -1);

            for (index = 0; parse_header_list[index + 1] ; ++index) {
                gtk_list_store_set (cd->store, &iter, HEADER_VALUE_COLUMN, parse_header_list[index + 1], -1);
            }
        }

        g_strfreev (headers);
    }

    /* Add the list here */

    hbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);

    gtk_box_pack_start (GTK_BOX (hbox), ech_configuration_box, TRUE, TRUE, 0);

    /* to let free data properly on destroy of configuration widget */
    g_object_set_data_full (G_OBJECT (hbox), "mycd-data", cd, destroy_cd_data);

    return hbox;
}

/* Configuration in Mail Prefs Page goes here */

GtkWidget *
org_gnome_email_custom_header_config_option (EPlugin *epl,
                                             struct _EConfigHookItemFactoryData *data)
{
    /* This function and the hook needs to be removed,
    once the configure code is thoroughly tested */

    return NULL;

}