src/omxmlsec/tokens/token_transform.c

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdio.h>
#include <oxs_constants.h>
#include <oxs_error.h>
#include <oxs_token_transform.h>
#include <axiom_attribute.h>
#include <axiom_element.h>


AXIS2_EXTERN axiom_node_t* AXIS2_CALL
oxs_token_build_transform_element(const axutil_env_t *env,
                                  axiom_node_t *parent,
                                  axis2_char_t* algorithm
                                 )
{
    axiom_node_t *transform_node = NULL;
    axiom_element_t *transform_ele = NULL;
    axiom_attribute_t *algo_attr = NULL;
    int ret;
    axiom_namespace_t *ns_obj = NULL;

    ns_obj = axiom_namespace_create(env, OXS_DSIG_NS,
                                    OXS_DS);

    transform_ele = axiom_element_create(env, parent, OXS_NODE_TRANSFORM, ns_obj, &transform_node);
    if (!transform_ele)
    {
        oxs_error(env, ERROR_LOCATION,
                  OXS_ERROR_ELEMENT_FAILED, "Error creating transform element");
        return NULL;
    }
    /*If transform algorithm is NULL then use the default*/
    if (!algorithm)
    {
        algorithm = (axis2_char_t*)OXS_HREF_XML_EXC_C14N;
    }

    algo_attr =  axiom_attribute_create(env, OXS_ATTR_ALGORITHM, algorithm, NULL);

    ret = axiom_element_add_attribute(transform_ele, env, algo_attr, transform_node);

    return transform_node;

}



AXIS2_EXTERN axis2_char_t *AXIS2_CALL
oxs_token_get_transform(const axutil_env_t *env, axiom_node_t *transform_node)
{
    axis2_char_t *transform = NULL;
    axiom_element_t *transform_ele = NULL;

    if(!transform_node){
        return NULL;
    }

    transform_ele = axiom_node_get_data_element(transform_node, env);
    if (!transform_ele)
    {
        oxs_error(env, ERROR_LOCATION,
                  OXS_ERROR_ELEMENT_FAILED, "Error retrieving digest method element");
        return NULL;
    }

    transform = axiom_element_get_attribute_value_by_name(transform_ele, env, OXS_ATTR_ALGORITHM);
    if((!transform) ||(0 == axutil_strcmp("", transform))){
        return NULL;
    }

    return transform;

}