// 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 "util/url_coding.h"

#include <libbase64.h>

#include <sstream>

namespace doris {

inline unsigned char to_hex(unsigned char x) {

    return x + (x > 9 ? ('A' - 10) : '0');

}

// Adapted from http://dlib.net/dlib/server/server_http.cpp.html

void url_encode(const std::string_view& in, std::string* out) {

    std::ostringstream os;

    for (auto c : in) {

        // impl as https://docs.oracle.com/javase/8/docs/api/java/net/URLEncoder.html

        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') ||

            c == '.' || c == '-' || c == '*' || c == '_') { // allowed

            os << c;

        } else if (c == ' ') {

            os << '+';

        } else {

            ///TODO: In the past, there was an error here involving the modulus operation on a char (signed number).

            // When the char data exceeds 128 (UTF-8 byte), it leads to incorrect results. It is actually better to use some third-party libraries here.

            os << '%' << to_hex((unsigned char)c >> 4) << to_hex((unsigned char)c % 16);

        }

    }

    *out = os.str();

}

// Adapted from

// http://www.boost.org/doc/libs/1_40_0/doc/html/boost_asio/

//   example/http/server3/request_handler.cpp

// See http://www.boost.org/LICENSE_1_0.txt for license for this method.

bool url_decode(const std::string& in, std::string* out) {

    out->clear();

    out->reserve(in.size());

    for (size_t i = 0; i < in.size(); ++i) {

        if (in[i] == '%') {

            if (i + 3 <= in.size()) {

                int value = 0;

                std::istringstream is(in.substr(i + 1, 2));

                if (is >> std::hex >> value) {

                    (*out) += static_cast<char>(value);

                    i += 2;

                } else {

                    return false;

                }

            } else {

                return false;

            }

        } else if (in[i] == '+') {

            (*out) += ' ';

        } else {

            (*out) += in[i];

        }

    }

    return true;

}

void base64_encode(const std::string& in, std::string* out) {

    out->resize(size_t(in.length() * (4.0 / 3) + 1));

    auto len = base64_encode(reinterpret_cast<const unsigned char*>(in.c_str()), in.length(),

                             (unsigned char*)out->c_str());

    out->resize(len);

}

size_t base64_encode(const unsigned char* data, size_t length, unsigned char* encoded_data) {

    size_t encode_len = 0;

#if defined(__aarch64__) || defined(_M_ARM64)

    do_base64_encode(reinterpret_cast<const char*>(data), length,

                     reinterpret_cast<char*>(encoded_data), &encode_len, BASE64_FORCE_NEON64);

#else

    do_base64_encode(reinterpret_cast<const char*>(data), length,

                     reinterpret_cast<char*>(encoded_data), &encode_len, 0);

#endif

    return encode_len;

}

int64_t base64_decode(const char* data, size_t length, char* decoded_data) {

    size_t decode_len = 0;

#if defined(__aarch64__) || defined(_M_ARM64)

    auto ret = do_base64_decode(reinterpret_cast<const char*>(data), length, decoded_data,

                                &decode_len, BASE64_FORCE_NEON64);

#else

    auto ret = do_base64_decode(reinterpret_cast<const char*>(data), length, decoded_data,

                                &decode_len, 0);

#endif

    return ret > 0 ? decode_len : -1;

}

bool base64_decode(const std::string& in, std::string* out) {

    out->resize(in.length());

    int64_t len = base64_decode(in.c_str(), in.length(), out->data());

    if (len < 0) {

        return false;

    }

    out->resize(len);

    return true;

}

void escape_for_html(const std::string& in, std::stringstream* out) {

    for (const auto& c : in) {

        switch (c) {

        case '<':

            (*out) << "&lt;";

            break;

        case '>':

            (*out) << "&gt;";

            break;

        case '&':

            (*out) << "&amp;";

            break;

        default:

            (*out) << c;

        }

    }

}

std::string escape_for_html_to_string(const std::string& in) {

    std::stringstream str;

    escape_for_html(in, &str);

    return str.str();

}

} // namespace doris