/*
 *  Copyright 2001-2007 Internet2
 *
 * Licensed 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.
 */

/**
 * CommonDomainCookie.cpp
 *
 * Helper class for maintaining discovery cookie.
 */

#include "internal.h"
#include "lite/CommonDomainCookie.h"

#include <xercesc/util/Base64.hpp>
#include <xmltooling/XMLToolingConfig.h>
#include <xmltooling/util/URLEncoder.h>

using namespace opensaml;
using namespace xmltooling;
using namespace std;

const char CommonDomainCookie::CDCName[] = "_saml_idp";

CommonDomainCookie::CommonDomainCookie(const char* cookie)
{
    if (!cookie)
        return;

    // Copy it so we can URL-decode it.
    char* b64=strdup(cookie);
    XMLToolingConfig::getConfig().getURLEncoder()->decode(b64);

    // Chop it up and save off elements.
    vector<string> templist;
    char* ptr=b64;
    while (*ptr) {
        while (*ptr && isspace(*ptr)) ptr++;
        char* end=ptr;
        while (*end && !isspace(*end)) end++;
        templist.push_back(string(ptr,end-ptr));
        ptr=end;
    }
    free(b64);

    // Now Base64 decode the list.
    xsecsize_t len;
    for (vector<string>::iterator i=templist.begin(); i!=templist.end(); ++i) {
        XMLByte* decoded=Base64::decode(reinterpret_cast<const XMLByte*>(i->c_str()),&len);
        if (decoded && *decoded) {
            m_list.push_back(reinterpret_cast<char*>(decoded));
#ifdef SHIBSP_XERCESC_HAS_XMLBYTE_RELEASE
            XMLString::release(&decoded);
#else
            XMLString::release((char**)&decoded);
#endif
        }
    }
}

CommonDomainCookie::~CommonDomainCookie()
{
}

const vector<string>& CommonDomainCookie::get() const
{
    return m_list;
}

const char* CommonDomainCookie::set(const char* entityID)
{
    // First scan the list for this IdP.
    for (vector<string>::iterator i=m_list.begin(); i!=m_list.end(); i++) {
        if (*i == entityID) {
            m_list.erase(i);
            break;
        }
    }

    // Append it to the end.
    m_list.push_back(entityID);

    // Now rebuild the delimited list.
    xsecsize_t len;
    string delimited;
    for (vector<string>::const_iterator j=m_list.begin(); j!=m_list.end(); j++) {
        if (!delimited.empty()) delimited += ' ';

        XMLByte* b64=Base64::encode(reinterpret_cast<const XMLByte*>(j->c_str()),j->length(),&len);
        XMLByte *pos, *pos2;
        for (pos=b64, pos2=b64; *pos2; pos2++)
            if (isgraph(*pos2))
                *pos++=*pos2;
        *pos=0;

        delimited += reinterpret_cast<char*>(b64);
#ifdef SHIBSP_XERCESC_HAS_XMLBYTE_RELEASE
        XMLString::release(&b64);
#else
        XMLString::release((char**)&b64);
#endif
    }

    m_encoded=XMLToolingConfig::getConfig().getURLEncoder()->encode(delimited.c_str());
    return m_encoded.c_str();
}
