path: root/e-util/e-signature.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/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>

#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>

#include <glib/gi18n-lib.h>
#include <gconf/gconf-client.h>

#include <libedataserver/e-uid.h>
#include <libedataserver/e-data-server-util.h>

#include "e-signature.h"

struct _ESignaturePrivate {
    gchar *filename;
    gchar *name;
    gchar *uid;

    gboolean autogenerated;
    gboolean is_html;
    gboolean is_script;
};

enum {
    PROP_0,
    PROP_AUTOGENERATED,
    PROP_FILENAME,
    PROP_IS_HTML,
    PROP_IS_SCRIPT,
    PROP_NAME,
    PROP_UID
};

G_DEFINE_TYPE (
    ESignature,
    e_signature,
    G_TYPE_OBJECT)

static gboolean
xml_set_bool (xmlNodePtr node,
              const gchar *name,
              gboolean *val)
{
    gboolean v_boolean;
    gchar *buf;

    if ((buf = (gchar *) xmlGetProp (node, (xmlChar *) name))) {
        v_boolean = (!strcmp (buf, "true") || !strcmp (buf, "yes"));
        xmlFree (buf);

        if (v_boolean != *val) {
            *val = v_boolean;
            return TRUE;
        }
    }

    return FALSE;
}

static gboolean
xml_set_prop (xmlNodePtr node,
              const gchar *name,
              gchar **val)
{
    gchar *buf, *new_val;

    buf = (gchar *) xmlGetProp (node, (xmlChar *) name);
    new_val = g_strdup (buf);
    xmlFree (buf);

    /* We can use strcmp here whether the value is UTF8 or
     * not, since we only care if the bytes changed.
     */
    if (!*val || strcmp (*val, new_val)) {
        g_free (*val);
        *val = new_val;
        return TRUE;
    } else {
        g_free (new_val);
        return FALSE;
    }
}

static gboolean
xml_set_content (xmlNodePtr node,
                 gchar **val)
{
    gchar *buf, *new_val;

    buf = (gchar *) xmlNodeGetContent (node);
    new_val = g_strdup (buf);
    xmlFree (buf);

    /* We can use strcmp here whether the value is UTF8 or
     * not, since we only care if the bytes changed. */
    if (!*val || strcmp (*val, new_val)) {
        g_free (*val);
        *val = new_val;
        return TRUE;
    } else {
        g_free (new_val);
        return FALSE;
    }
}

static void
signature_set_property (GObject *object,
                        guint property_id,
                        const GValue *value,
                        GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_AUTOGENERATED:
            e_signature_set_autogenerated (
                E_SIGNATURE (object),
                g_value_get_boolean (value));
            return;

        case PROP_FILENAME:
            e_signature_set_filename (
                E_SIGNATURE (object),
                g_value_get_string (value));
            return;

        case PROP_IS_HTML:
            e_signature_set_is_html (
                E_SIGNATURE (object),
                g_value_get_boolean (value));
            return;

        case PROP_IS_SCRIPT:
            e_signature_set_is_script (
                E_SIGNATURE (object),
                g_value_get_boolean (value));
            return;

        case PROP_NAME:
            e_signature_set_name (
                E_SIGNATURE (object),
                g_value_get_string (value));
            return;

        case PROP_UID:
            e_signature_set_uid (
                E_SIGNATURE (object),
                g_value_get_string (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
signature_get_property (GObject *object,
                        guint property_id,
                        GValue *value,
                        GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_AUTOGENERATED:
            g_value_set_boolean (
                value, e_signature_get_autogenerated (
                E_SIGNATURE (object)));
            return;

        case PROP_FILENAME:
            g_value_set_string (
                value, e_signature_get_filename (
                E_SIGNATURE (object)));
            return;

        case PROP_IS_HTML:
            g_value_set_boolean (
                value, e_signature_get_is_html (
                E_SIGNATURE (object)));
            return;

        case PROP_IS_SCRIPT:
            g_value_set_boolean (
                value, e_signature_get_is_script (
                E_SIGNATURE (object)));
            return;

        case PROP_NAME:
            g_value_set_string (
                value, e_signature_get_name (
                E_SIGNATURE (object)));
            return;

        case PROP_UID:
            g_value_set_string (
                value, e_signature_get_uid (
                E_SIGNATURE (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
signature_finalize (GObject *object)
{
    ESignaturePrivate *priv;

    priv = E_SIGNATURE (object)->priv;

    g_free (priv->filename);
    g_free (priv->name);
    g_free (priv->uid);

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

static void
e_signature_class_init (ESignatureClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (ESignaturePrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = signature_set_property;
    object_class->get_property = signature_get_property;
    object_class->finalize = signature_finalize;

    g_object_class_install_property (
        object_class,
        PROP_AUTOGENERATED,
        g_param_spec_boolean (
            "autogenerated",
            "Autogenerated",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_FILENAME,
        g_param_spec_string (
            "filename",
            "Filename",
            NULL,
            NULL,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_IS_HTML,
        g_param_spec_boolean (
            "is-html",
            "Is HTML",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_IS_SCRIPT,
        g_param_spec_boolean (
            "is-script",
            "Is Script",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_NAME,
        g_param_spec_string (
            "name",
            "Name",
            NULL,
            NULL,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    g_object_class_install_property (
        object_class,
        PROP_UID,
        g_param_spec_string (
            "uid",
            "UID",
            NULL,
            NULL,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));
}

static void
e_signature_init (ESignature *signature)
{
    signature->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        signature, E_TYPE_SIGNATURE, ESignaturePrivate);
}

/**
 * e_signature_new:
 *
 * Returns a new signature which can be filled in and
 * added to an #ESignatureList.
 *
 * Returns: a new #ESignature
 **/
ESignature *
e_signature_new (void)
{
    ESignature *signature;

    signature = g_object_new (E_TYPE_SIGNATURE, NULL);
    signature->priv->uid = e_uid_new ();

    return signature;
}

/**
 * e_signature_new_from_xml:
 * @xml: an XML signature description
 *
 * Return value: a new #ESignature based on the data in @xml, or %NULL
 * if @xml could not be parsed as valid signature data.
 **/
ESignature *
e_signature_new_from_xml (const gchar *xml)
{
    ESignature *signature;

    signature = g_object_new (E_TYPE_SIGNATURE, NULL);

    if (!e_signature_set_from_xml (signature, xml)) {
        g_object_unref (signature);
        return NULL;
    }

    return signature;
}

/**
 * e_signature_uid_from_xml:
 * @xml: an XML signature description
 *
 * Return value: the permanent UID of the signature described by @xml
 * (or %NULL if @xml could not be parsed or did not contain a uid).
 * The caller must free this string.
 **/
gchar *
e_signature_uid_from_xml (const gchar *xml)
{
    xmlNodePtr node;
    xmlDocPtr doc;
    gchar *uid = NULL;

    if (!(doc = xmlParseDoc ((xmlChar *) xml)))
        return NULL;

    node = doc->children;
    if (strcmp ((gchar *)node->name, "signature") != 0) {
        xmlFreeDoc (doc);
        return NULL;
    }

    xml_set_prop (node, "uid", &uid);
    xmlFreeDoc (doc);

    return uid;
}

/**
 * e_signature_set_from_xml:
 * @signature: an #ESignature
 * @xml: an XML signature description.
 *
 * Changes @signature to match @xml.
 *
 * Returns: %TRUE if the signature was loaded or %FALSE otherwise
 **/
gboolean
e_signature_set_from_xml (ESignature *signature, const gchar *xml)
{
    gboolean changed = FALSE;
    xmlNodePtr node, cur;
    xmlDocPtr doc;
    gboolean bool;
    gchar *buf;

    if (!(doc = xmlParseDoc ((xmlChar *) xml)))
        return FALSE;

    node = doc->children;
    if (strcmp ((gchar *)node->name, "signature") != 0) {
        xmlFreeDoc (doc);
        return FALSE;
    }

    buf = NULL;
    xml_set_prop (node, "uid", &buf);

    if (buf && *buf) {
        g_free (signature->priv->uid);
        signature->priv->uid = buf;
    }

    changed |= xml_set_prop (node, "name", &signature->priv->name);
    changed |= xml_set_bool (node, "auto", &signature->priv->autogenerated);

    if (e_signature_get_autogenerated (signature)) {
        xmlFreeDoc (doc);

        return changed;
    }

    buf = NULL;
    xml_set_prop (node, "format", &buf);
    if (buf && !strcmp (buf, "text/html"))
        bool = TRUE;
    else
        bool = FALSE;
    g_free (buf);

    if (e_signature_get_is_html (signature) != bool) {
        e_signature_set_is_html (signature, bool);
        changed = TRUE;
    }

    cur = node->children;
    while (cur) {
        if (!strcmp ((gchar *)cur->name, "filename")) {
            changed |= xml_set_content (
                cur, &signature->priv->filename);
            changed |= xml_set_bool (
                cur, "script", &signature->priv->is_script);
            break;
        } else if (!strcmp ((gchar *)cur->name, "script")) {
            /* this is for handling 1.4 signature script definitions */
            changed |= xml_set_content (
                cur, &signature->priv->filename);
            if (!e_signature_get_is_script (signature)) {
                e_signature_set_is_script (signature, TRUE);
                changed = TRUE;
            }
            break;
        }
        cur = cur->next;
    }

    /* If the signature is not a script, replace the directory
     * part with the current signatures directory.  This makes
     * moving the signatures directory transparent. */
    if (!e_signature_get_is_script (signature)) {
        const gchar *user_data_dir;
        gchar *basename;
        gchar *filename;

        user_data_dir = e_get_user_data_dir ();

        filename = signature->priv->filename;
        basename = g_path_get_basename (filename);
        signature->priv->filename = g_build_filename (
            user_data_dir, "signatures", basename, NULL);
        g_free (basename);
        g_free (filename);
    }

    xmlFreeDoc (doc);

    return changed;
}

/**
 * e_signature_to_xml:
 * @signature: an #ESignature
 *
 * Return value: an XML representation of @signature, which the caller
 * must free.
 **/
gchar *
e_signature_to_xml (ESignature *signature)
{
    xmlChar *xmlbuf;
    gchar *tmp;
    xmlNodePtr root, node;
    xmlDocPtr doc;
    const gchar *string;
    gint n;

    doc = xmlNewDoc ((xmlChar *) "1.0");

    root = xmlNewDocNode (doc, NULL, (xmlChar *) "signature", NULL);
    xmlDocSetRootElement (doc, root);

    string = e_signature_get_name (signature);
    xmlSetProp (root, (xmlChar *) "name", (xmlChar *) string);

    string = e_signature_get_uid (signature);
    xmlSetProp (root, (xmlChar *) "uid", (xmlChar *) string);

    if (e_signature_get_autogenerated (signature))
        string = "true";
    else
        string = "false";
    xmlSetProp (root, (xmlChar *) "auto", (xmlChar *) string);

    if (!e_signature_get_autogenerated (signature)) {
        if (e_signature_get_is_html (signature))
            string = "text/html";
        else
            string = "text/plain";
        xmlSetProp (root, (xmlChar *) "format", (xmlChar *) string);

        string = e_signature_get_filename (signature);
        if (string != NULL) {

            /* For scripts we save the full filename,
             * for normal signatures just the basename. */
            if (e_signature_get_is_script (signature)) {
                node = xmlNewTextChild (
                    root, NULL, (xmlChar *) "filename",
                    (xmlChar *) string);
                xmlSetProp (
                    node, (xmlChar *) "script",
                    (xmlChar *) "true");
            } else {
                gchar *basename;

                basename = g_path_get_basename (string);
                node = xmlNewTextChild (
                    root, NULL, (xmlChar *) "filename",
                    (xmlChar *) basename);
                g_free (basename);
            }
        }
    } else {
        /* this is to make Evolution-1.4 and older 1.5 versions happy */
        xmlSetProp (root, (xmlChar *) "format", (xmlChar *) "text/html");
    }

    xmlDocDumpMemory (doc, &xmlbuf, &n);
    xmlFreeDoc (doc);

    /* remap to glib memory */
    tmp = g_malloc (n + 1);
    memcpy (tmp, xmlbuf, n);
    tmp[n] = '\0';
    xmlFree (xmlbuf);

    return tmp;
}

gboolean
e_signature_is_equal (ESignature *signature1,
                      ESignature *signature2)
{
    const gchar *uid1;
    const gchar *uid2;

    g_return_val_if_fail (E_IS_SIGNATURE (signature1), FALSE);
    g_return_val_if_fail (E_IS_SIGNATURE (signature2), FALSE);

    /* XXX Simply compares the UIDs.  Not fool-proof. */
    uid1 = e_signature_get_uid (signature1);
    uid2 = e_signature_get_uid (signature2);

    return (g_strcmp0 (uid1, uid2) == 0);
}

gboolean
e_signature_get_autogenerated (ESignature *signature)
{
    g_return_val_if_fail (E_IS_SIGNATURE (signature), FALSE);

    return signature->priv->autogenerated;
}

void
e_signature_set_autogenerated (ESignature *signature,
                               gboolean autogenerated)
{
    g_return_if_fail (E_IS_SIGNATURE (signature));

    if (signature->priv->autogenerated == autogenerated)
        return;

    signature->priv->autogenerated = autogenerated;

    /* Autogenerated flags overrides several properties. */
    g_object_freeze_notify (G_OBJECT (signature));
    g_object_notify (G_OBJECT (signature), "autogenerated");
    g_object_notify (G_OBJECT (signature), "filename");
    g_object_notify (G_OBJECT (signature), "is-html");
    g_object_notify (G_OBJECT (signature), "is-script");
    g_object_notify (G_OBJECT (signature), "name");
    g_object_thaw_notify (G_OBJECT (signature));
}

const gchar *
e_signature_get_filename (ESignature *signature)
{
    g_return_val_if_fail (E_IS_SIGNATURE (signature), NULL);

    /* Autogenerated flags overrides the filename property. */
    if (e_signature_get_autogenerated (signature))
        return NULL;

    return signature->priv->filename;
}

void
e_signature_set_filename (ESignature *signature,
                          const gchar *filename)
{
    g_return_if_fail (E_IS_SIGNATURE (signature));

    g_free (signature->priv->filename);
    signature->priv->filename = g_strdup (filename);

    g_object_notify (G_OBJECT (signature), "filename");
}

gboolean
e_signature_get_is_html (ESignature *signature)
{
    g_return_val_if_fail (E_IS_SIGNATURE (signature), FALSE);

    /* Autogenerated flag overrides the is-html property. */
    if (e_signature_get_autogenerated (signature))
        return FALSE;

    return signature->priv->is_html;
}

void
e_signature_set_is_html (ESignature *signature,
                         gboolean is_html)
{
    g_return_if_fail (E_IS_SIGNATURE (signature));

    if (signature->priv->is_html == is_html)
        return;

    signature->priv->is_html = is_html;

    g_object_notify (G_OBJECT (signature), "is-html");
}

gboolean
e_signature_get_is_script (ESignature *signature)
{
    g_return_val_if_fail (E_IS_SIGNATURE (signature), FALSE);

    /* Autogenerated flags overrides the is-script property. */
    if (e_signature_get_autogenerated (signature))
        return FALSE;

    return signature->priv->is_script;
}

void
e_signature_set_is_script (ESignature *signature,
                           gboolean is_script)
{
    g_return_if_fail (E_IS_SIGNATURE (signature));

    if (signature->priv->is_script == is_script)
        return;

    signature->priv->is_script = is_script;

    g_object_notify (G_OBJECT (signature), "is-script");
}

const gchar *
e_signature_get_name (ESignature *signature)
{
    g_return_val_if_fail (E_IS_SIGNATURE (signature), NULL);

    /* Autogenerated flag overrides the name property. */
    if (e_signature_get_autogenerated (signature))
        return _("Autogenerated");

    return signature->priv->name;
}

void
e_signature_set_name (ESignature *signature,
                      const gchar *name)
{
    g_return_if_fail (E_IS_SIGNATURE (signature));

    g_free (signature->priv->name);
    signature->priv->name = g_strdup (name);

    g_object_notify (G_OBJECT (signature), "name");
}

const gchar *
e_signature_get_uid (ESignature *signature)
{
    g_return_val_if_fail (E_IS_SIGNATURE (signature), NULL);

    return signature->priv->uid;
}

void
e_signature_set_uid (ESignature *signature,
                     const gchar *uid)
{
    g_return_if_fail (E_IS_SIGNATURE (signature));

    g_free (signature->priv->uid);

    if (uid == NULL)
        signature->priv->uid = e_uid_new ();
    else
        signature->priv->uid = g_strdup (uid);

    g_object_notify (G_OBJECT (signature), "uid");
}