生成认证字符串需要用到的工具类
namespace App\Service;
class HttpUtil
{
// 根据RFC 3986，除了：
// 1.大小写英文字符
// 2.阿拉伯数字
// 3.点'.'、波浪线'~'、减号'-'以及下划线'_'
// 以外都要编码
public static $PERCENT_ENCODED_STRINGS;
//填充编码数组
public static function __init()
{
HttpUtil::$PERCENT_ENCODED_STRINGS = array();
for ($i = 0; $i < 256; ++$i) {
HttpUtil::$PERCENT_ENCODED_STRINGS[$i] = sprintf("%%%02X", $i);
}
//a-z不编码
foreach (range('a', 'z') as $ch) {
HttpUtil::$PERCENT_ENCODED_STRINGS[ord($ch)] = $ch;
}
//A-Z不编码
foreach (range('A', 'Z') as $ch) {
HttpUtil::$PERCENT_ENCODED_STRINGS[ord($ch)] = $ch;
}
//0-9不编码
foreach (range('0', '9') as $ch) {
HttpUtil::$PERCENT_ENCODED_STRINGS[ord($ch)] = $ch;
}
//以下4个字符不编码
HttpUtil::$PERCENT_ENCODED_STRINGS[ord('-')] = '-';
HttpUtil::$PERCENT_ENCODED_STRINGS[ord('.')] = '.';
HttpUtil::$PERCENT_ENCODED_STRINGS[ord('_')] = '_';
HttpUtil::$PERCENT_ENCODED_STRINGS[ord('~')] = '~';
}
//在uri编码中不能对'/'编码
public static function urlEncodeExceptSlash($path)
{
return str_replace("%2F", "/", HttpUtil::urlEncode($path));
}
//使用编码数组编码
public static function urlEncode($value)
{
$result = '';
for ($i = 0; $i < strlen($value); ++$i) {
$result .= HttpUtil::$PERCENT_ENCODED_STRINGS[ord($value[$i])];
}
return $result;
}
//生成标准化QueryString
public static function getCanonicalQueryString(array $parameters)
{
//没有参数，直接返回空串
if (count($parameters) == 0) {
return '';
}
$parameterStrings = array();
foreach ($parameters as $k => $v) {
//跳过Authorization字段
if (strcasecmp('Authorization', $k) == 0) {
continue;
}
if (!isset($k)) {
throw new \InvalidArgumentException(
"parameter key should not be null"
);
}
if (isset($v)) {
//对于有值的，编码后放在=号两边
$parameterStrings[] = HttpUtil::urlEncode($k)
. '=' . HttpUtil::urlEncode((string) $v);
} else {
//对于没有值的，只将key编码后放在=号的左边，右边留空
$parameterStrings[] = HttpUtil::urlEncode($k) . '=';
}
}
//按照字典序排序
sort($parameterStrings);
//使用'&'符号连接它们
return implode('&', $parameterStrings);
}
//生成标准化uri
public static function getCanonicalURIPath($path)
{
//空路径设置为'/'
if (empty($path)) {
return '/';
} else {
//所有的uri必须以'/'开头
if ($path[0] == '/') {
return HttpUtil::urlEncodeExceptSlash($path);
} else {
return '/' . HttpUtil::urlEncodeExceptSlash($path);
}
}
}
//生成标准化http请求头串
public static function getCanonicalHeaders($headers)
{
//如果没有headers，则返回空串
if (count($headers) == 0) {
return '';
}
$headerStrings = array();
foreach ($headers as $k => $v) {
//跳过key为null的
if ($k === null) {
continue;
}
//如果value为null，则赋值为空串
if ($v === null) {
$v = '';
}
//trim后再encode，之后使用':'号连接起来
$headerStrings[] = HttpUtil::urlEncode(strtolower(trim($k))) . ':' . HttpUtil::urlEncode(trim($v));
}
//字典序排序
sort($headerStrings);
//用'\n'把它们连接起来
return implode("\n", $headerStrings);
}
}
对接百度文档服务接口, 这里写了注册文档和阅读文档两个例子
namespace App\Service;
use GuzzleHttp\Client;
class BaiduDoc
{
protected $credentials = ['ak' => '', 'sk' => ''];
protected $host = 'doc.bj.baidubce.com';
protected $timestamp;
protected $expirationInSeconds = 60;
public function __construct()
{
HttpUtil::__init();
date_default_timezone_get('UTC');
$this->timestamp = new \DateTime();
}
/**
* 注册文档
* @return array|\Psr\Http\Message\StreamInterface
*/
public function register()
{
// >> first: get authorization
$method = 'POST';
$uri = '/v2/document' ;
$params = ['register' => ''];
$authorization = $this->getAuthorization($method, $this->host, $uri, $params, $this->timestamp, $this->expirationInSeconds);
// >> second: create header and body information for http request
$url = "https://{$this->host}{$uri}?register";
$timeStr = $this->timestamp->format("Y-m-d\TH:i:s\Z");
$head = [
"Content-Type" => "application/json",
"Authorization" => $authorization,
"x-bce-date" => $timeStr,
];
$body = [
'title' => '123',
'format' => 'doc',
];
$client = new Client();
$response = $client->request($method, $url, [
'body' => json_encode($body),
'headers' => $head
]);
$body = $response->getBody();
return $body;
}
/**
* 阅读文档
* @return array|\Psr\Http\Message\StreamInterface
*/
public function read()
{
// >> first: get authorization
$method = 'GET';
$documentId = 'doc-icukvvnfq6ixnat';
$uri = '/v2/document/'. $documentId;
$params = ['read' => ''];
$this->expirationInSeconds = 3600;
$authorization = $this->getAuthorization($method, $this->host, $uri, $params, $this->timestamp, $this->expirationInSeconds);
// >> second: create header and body information for http request
$url = "http://{$this->host}{$uri}?read";
$timeStr = $this->timestamp->format("Y-m-d\TH:i:s\Z");
$head = [
"Content-Type" => "application/json",
"Authorization" => $authorization,
"x-bce-date" => $timeStr,
];
$client = new Client();
$response = $client->request($method, $url, [
'headers' => $head
]);
$body = $response->getBody();
return $body;
}
// 获取认证字符串
protected function getAuthorization($method, $host, $uri, $params, $timestamp, $expirationInSeconds)
{
$timeStr = $timestamp->format("Y-m-d\TH:i:s\Z");
$authStringPrefix = "bce-auth-v1/{$this->credentials['ak']}/{$timeStr}/{$expirationInSeconds}";
$signingKey = hash_hmac('SHA256', $authStringPrefix, $this->credentials['sk']);
$canonicalHeader1 = "host;x-bce-date";
$canonicalHeader2 = "host:{$host}\n" . "x-bce-date:" . urlencode($timeStr);
$httpUtil = new HttpUtil();
$canonicalString = $httpUtil->getCanonicalQueryString($params);
$canonicalUri = $httpUtil->getCanonicalURIPath($uri);
$method = strtoupper($method);
$canonicalRequest = "{$method}\n{$canonicalUri}\n{$canonicalString}\n{$canonicalHeader2}";
$signature = hash_hmac('SHA256', $canonicalRequest, $signingKey);
$authorization = "bce-auth-v1/{$this->credentials['ak']}/{$timeStr}/{$expirationInSeconds}/{$canonicalHeader1}/{$signature}";
return $authorization;
}
}
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