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<?php
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/*
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* Copyright (c) 2014 Baidu.com, Inc. All Rights Reserved
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* Http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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class SignOption
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{
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const EXPIRATION_IN_SECONDS = 'expirationInSeconds';
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const HEADERS_TO_SIGN = 'headersToSign';
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const TIMESTAMP = 'timestamp';
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const DEFAULT_EXPIRATION_IN_SECONDS = 1800;
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const MIN_EXPIRATION_IN_SECONDS = 300;
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const MAX_EXPIRATION_IN_SECONDS = 129600;
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}
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class HttpUtil
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{
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// 根据RFC 3986，除了：
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// 1.大小写英文字符
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// 2.阿拉伯数字
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// 3.点'.'、波浪线'~'、减号'-'以及下划线'_'
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// 以外都要编码
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public static $PERCENT_ENCODED_STRINGS;
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//填充编码数组
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public static function __init()
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{
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HttpUtil::$PERCENT_ENCODED_STRINGS = array();
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for ($i = 0; $i < 256; ++$i) {
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HttpUtil::$PERCENT_ENCODED_STRINGS[$i] = sprintf("%%%02X", $i);
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}
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//a-z不编码
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foreach (range('a', 'z') as $ch) {
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord($ch)] = $ch;
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}
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//A-Z不编码
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foreach (range('A', 'Z') as $ch) {
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord($ch)] = $ch;
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}
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//0-9不编码
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foreach (range('0', '9') as $ch) {
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord($ch)] = $ch;
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}
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//以下4个字符不编码
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord('-')] = '-';
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord('.')] = '.';
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord('_')] = '_';
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HttpUtil::$PERCENT_ENCODED_STRINGS[ord('~')] = '~';
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}
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//在uri编码中不能对'/'编码
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public static function urlEncodeExceptSlash($path)
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{
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return str_replace("%2F", "/", HttpUtil::urlEncode($path));
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}
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//使用编码数组编码
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public static function urlEncode($value)
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{
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$result = '';
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for ($i = 0; $i < strlen($value); ++$i) {
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$result .= HttpUtil::$PERCENT_ENCODED_STRINGS[ord($value[$i])];
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}
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return $result;
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}
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//生成标准化QueryString
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public static function getCanonicalQueryString(array $parameters)
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{
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//没有参数，直接返回空串
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if (count($parameters) == 0) {
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return '';
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}
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$parameterStrings = array();
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foreach ($parameters as $k => $v) {
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//跳过Authorization字段
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if (strcasecmp('Authorization', $k) == 0) {
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continue;
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}
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if (!isset($k)) {
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throw new \InvalidArgumentException(
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"parameter key should not be null"
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);
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}
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if (isset($v)) {
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//对于有值的，编码后放在=号两边
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$parameterStrings[] = HttpUtil::urlEncode($k)
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. '=' . HttpUtil::urlEncode((string) $v);
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} else {
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//对于没有值的，只将key编码后放在=号的左边，右边留空
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$parameterStrings[] = HttpUtil::urlEncode($k) . '=';
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}
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}
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//按照字典序排序
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sort($parameterStrings);
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//使用'&'符号连接它们
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return implode('&', $parameterStrings);
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}
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//生成标准化uri
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public static function getCanonicalURIPath($path)
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{
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//空路径设置为'/'
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if (empty($path)) {
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return '/';
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} else {
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//所有的uri必须以'/'开头
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if ($path[0] == '/') {
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return HttpUtil::urlEncodeExceptSlash($path);
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} else {
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return '/' . HttpUtil::urlEncodeExceptSlash($path);
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}
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}
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}
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//生成标准化http请求头串
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public static function getCanonicalHeaders($headers)
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{
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//如果没有headers，则返回空串
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if (count($headers) == 0) {
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return '';
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}
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$headerStrings = array();
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foreach ($headers as $k => $v) {
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//跳过key为null的
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if ($k === null) {
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continue;
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}
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//如果value为null，则赋值为空串
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if ($v === null) {
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$v = '';
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}
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//trim后再encode，之后使用':'号连接起来
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$headerStrings[] = HttpUtil::urlEncode(strtolower(trim($k))) . ':' . HttpUtil::urlEncode(trim($v));
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}
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//字典序排序
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sort($headerStrings);
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//用'\n'把它们连接起来
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return implode("\n", $headerStrings);
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}
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}
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HttpUtil::__init();
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class SampleSigner
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{
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const BCE_AUTH_VERSION = "bce-auth-v1";
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const BCE_PREFIX = 'x-bce-';
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//不指定headersToSign情况下，默认签名http头，包括：
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// 1.host
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// 2.content-length
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// 3.content-type
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// 4.content-md5
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public static $defaultHeadersToSign;
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public static function __init()
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{
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SampleSigner::$defaultHeadersToSign = array(
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"host",
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"content-length",
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"content-type",
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"content-md5",
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);
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}
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//签名函数
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public function sign(
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array $credentials,
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$httpMethod,
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$path,
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$headers,
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$params,
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$options = array()
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) {
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//设定签名有效时间
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if (!isset($options[SignOption::EXPIRATION_IN_SECONDS])) {
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//默认值1800秒
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$expirationInSeconds = SignOption::DEFAULT_EXPIRATION_IN_SECONDS;
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} else {
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$expirationInSeconds = $options[SignOption::EXPIRATION_IN_SECONDS];
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}
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//解析ak sk
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$accessKeyId = $credentials['ak'];
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$secretAccessKey = $credentials['sk'];
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//设定时间戳，注意：如果自行指定时间戳需要为UTC时间
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if (!isset($options[SignOption::TIMESTAMP])) {
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//默认值当前时间
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$timestamp = new \DateTime();
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} else {
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$timestamp = $options[SignOption::TIMESTAMP];
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}
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$timestamp->setTimezone(new \DateTimeZone("UTC"));
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//生成authString
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$authString = SampleSigner::BCE_AUTH_VERSION . '/' . $accessKeyId . '/'
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. $timestamp->format("Y-m-d\TH:i:s\Z") . '/' . $expirationInSeconds;
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//使用sk和authString生成signKey
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$signingKey = hash_hmac('sha256', $authString, $secretAccessKey);
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//生成标准化URI
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$canonicalURI = HttpUtil::getCanonicalURIPath($path);
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//生成标准化QueryString
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$canonicalQueryString = HttpUtil::getCanonicalQueryString($params);
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//填充headersToSign，也就是指明哪些header参与签名
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$headersToSignOption = null;
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if (isset($options[SignOption::HEADERS_TO_SIGN])) {
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$headersToSignOption = $options[SignOption::HEADERS_TO_SIGN];
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}
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$headersToSign = SampleSigner::getHeadersToSign($headers, $headersToSignOption);
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//生成标准化header
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$canonicalHeader = HttpUtil::getCanonicalHeaders($headersToSign);
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$headersToSign = array_keys($headersToSign);
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sort($headersToSign);
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//整理headersToSign，以';'号连接
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$signedHeaders = '';
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if ($headersToSignOption !== null) {
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$signedHeaders = strtolower(
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trim(implode(";", $headersToSign))
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);
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}
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//组成标准请求串
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$canonicalRequest = "$httpMethod\n$canonicalURI\n"
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. "$canonicalQueryString\n$canonicalHeader";
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//使用signKey和标准请求串完成签名
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$signature = hash_hmac('sha256', $canonicalRequest, $signingKey);
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//组成最终签名串
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$authorizationHeader = "$authString/$signedHeaders/$signature";
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return $authorizationHeader;
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}
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/** 根据headsToSign过滤应该参与签名的header
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*
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* @param $headers array
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* @param $headersToSign array
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* @return array
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*/
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public static function getHeadersToSign($headers, $headersToSign)
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{
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$ret = array();
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if ($headersToSign !== null) {
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$tmp = array();
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//处理headers的key：去掉前后的空白并转化成小写
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foreach ($headersToSign as $header) {
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$tmp[] = strtolower(trim($header));
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}
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$headersToSign = $tmp;
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}
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foreach ($headers as $k => $v) {
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if (trim((string) $v) !== '') {
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if ($headersToSign !== null) {
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//预处理headersToSign：去掉前后的空白并转化成小写
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if (in_array(strtolower(trim($k)), $headersToSign)) {
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$ret[$k] = $v;
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}
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} else {
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//如果没有headersToSign，则根据默认规则来选取headers
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if (SampleSigner::isDefaultHeaderToSign($k, $headersToSign)) {
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$ret[$k] = $v;
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}
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}
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}
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}
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return $ret;
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}
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/**
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* 检查header是不是默认参加签名的：
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* 1.是host、content-type、content-md5、content-length之一
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* 2.以x-bce开头
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*
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* @param $header string
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* @return bool
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*/
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public static function isDefaultHeaderToSign($header)
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{
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$header = strtolower(trim($header));
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if (in_array($header, SampleSigner::$defaultHeadersToSign)) {
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return true;
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}
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$prefix = substr($header, 0, strlen(SampleSigner::BCE_PREFIX));
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if ($prefix === SampleSigner::BCE_PREFIX) {
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return true;
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} else {
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return false;
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}
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}
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}
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SampleSigner::__init();
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