Php Google API OAuth 2.0“返回”；缺少必需的参数：grant“U type”；

我正在尝试为web服务器应用程序实现Google的OAuth2.0身份验证

我可以从Google ok获得代码，但当我发回此代码以尝试获取访问令牌时，它总是给我错误“缺少必需参数：grant_类型。错误400”，即使grant_类型存在

另外，如果我将内容长度指定为0以外的任何值，则会引发其他错误

下面是做这篇文章的代码：

$url = 'https://accounts.google.com/o/oauth2/token';
$ch = curl_init($url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
curl_setopt($ch, CURLOPT_FAILONERROR, false);  
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST'); 

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/x-www-form-urlencoded',
    'Content-length: 0'
));

curl_setopt($ch, CURLOPT_POSTFIELDS, array( 
    'code='. urlencode($code),
    'client_id=' . urlencode($clientID),
    'client_secret=' . urlencode($clientSecret),
    'redirect_uri=http%3A%2F%2Flocalhost%2Fexperiments%2FnewGALogin.php',
    'grant_type=authorization_code'
)); 

---

请仔细阅读文档以了解以下信息：

。。。作为一个数组，字段名作为键，字段数据作为值

你只是做点什么，但不是那样。尝试：

curl_setopt($ch, CURLOPT_POSTFIELDS, array( 
    'code' => $code,
    'client_id' => $clientID,
    ...

在这种情况下，您不需要

urlencode

。

试试看

curl_setopt($ch, CURLOPT_POSTFIELDS, array( 
    'code' => $code,
    'client_id' => $clientID,
    'client_secret' => $clientSecret,
    'redirect_uri' => 'http%3A%2F%2Flocalhost%2Fexperiments%2FnewGALogin.php',
    'grant_type' => 'authorization_code'
)); 

或

---

我不想相信这一点，但奇怪的是，只需将CURLOPT_POSTFIELDS从数组切换到“&”串联字符串（使用相同的数据！）就可以让我的OAuth服务器最终识别grant_类型。

在研究了这个问题后，数组格式中似乎不接受grant_类型。（是的，查询字符串方法可以工作，但构建起来很麻烦。）

如果您希望将POST字段保留在数组中，那么将http_build_query（）添加到数组中是可行的

curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array( 
    'code' => $code,
    'client_id' => $clientID,
    'client_secret' => $clientSecret,
    'redirect_uri' => 'http%3A%2F%2Flocalhost%2Fexperiments%2FnewGALogin.php',
    'grant_type' => 'authorization_code'
))); 

---

原始问题和一些答案的核心问题是使用键

CURLOPT\u POSTFIELDS

时在

CURLOPT\u setopt

调用中接受的不同值

当输入为数组时，生成的

内容类型

将是

多部分/表单数据

，这不符合OAuth 2.0规范，服务器将忽略它。当输入是查询编码字符串（例如使用

http\u build\u query

构建）时，

内容类型：

将是

application/x-www-form-urlencoded

，这是规范要求的

---

请参阅：

的“注释”部分，我试图使用此处提供的原始问题和答案中的PHP代码，并不断收到Google token服务器关于缺少“grant_类型”的投诉，尽管它肯定是被传入的。原来问题是CURLOPT_HTTPHEADER不喜欢/不需要“内容长度：0”。希望这个完整的工作代码能帮其他人省去同样的麻烦

// This is what Google's OAUTH server sends to you
$code = $_GET['code'];

// These come from your client_secret.json file
$clientID = "your client id.apps.googleusercontent.com";
$clientSecret = "your client secret";
$redirectURI = "your redirect URI";
$token_uri = 'https://accounts.google.com/o/oauth2/token';


$ch = curl_init($token_uri);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
curl_setopt($ch, CURLOPT_FAILONERROR, false);  
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/x-www-form-urlencoded'
));

// Build the URLEncoded post data
$postFields = http_build_query(array( 
    'client_secret' => $clientSecret,
    'grant_type' => 'authorization_code',
    'redirect_uri' => $redirectURI,
    'client_id' => $clientID,
    'code' => $code
));
curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields); 

$response = curl_exec($ch);

// Save response, especially the "refresh_token"
$pathToAccessToken = "/your/path/to/access_token.json";
file_put_contents($pathToAccessToken, $response);

仅供参考，JSON响应如下所示：

{
  "access_token" : "xxxWhateverGibberish", 
  "token_type" : "Bearer", 
  "expires_in" : 3600, 
  "refresh_token" : "yyyMoreGibberish" 
}

之后，我可以使用如下代码成功地查询日历（原始OAuth请求调用的API范围）：

function getClient() {
  $client = new Google_Client();
  $client->setApplicationName(APPLICATION_NAME);
  $client->setScopes(SCOPES);
  $client->setAuthConfigFile(CLIENT_SECRET_PATH);
  $client->setAccessType('offline');

  // Load previously authorized credentials from a file.
  $pathToAccessToken = "/your/path/to/access_token.json";
  $accessToken = file_get_contents($pathToAccessToken);
  $client->setAccessToken($accessToken);

  // Refresh the token if it's expired.
  if ($client->isAccessTokenExpired()) {
    $client->refreshToken($client->getRefreshToken());
    file_put_contents($pathToAccessToken, $client->getAccessToken());
  }

  return $client;
}

$client = getClient();
$service = new Google_Service_Calendar($client);

// Print the next 10 events on the user's calendar.
$calendarId = 'primary';
$optParams = array(
      'maxResults' => 10,
      'orderBy' => 'startTime',
      'singleEvents' => TRUE,
      'timeMin' => date('c'),
);
$results = $service->events->listEvents($calendarId, $optParams);

if (count($results->getItems()) == 0) {
    print "No upcoming events found.\n";
} else {
    print "Upcoming events:\n";
    foreach ($results->getItems() as $event) {
        $start = $event->start->dateTime;
        if (empty($start)) {
          $start = $event->start->date;
        }
        printf("%s (%s)\n", $event->getSummary(), $start);
    }
}       

function getClient() {
  $client = new Google_Client();
  $client->setApplicationName(APPLICATION_NAME);
  $client->setScopes(SCOPES);
  $client->setAuthConfigFile(CLIENT_SECRET_PATH);
  $client->setAccessType('offline');

  // Load previously authorized credentials from a file.
  $pathToAccessToken = "/your/path/to/access_token.json";
  $accessToken = file_get_contents($pathToAccessToken);
  $client->setAccessToken($accessToken);

  // Refresh the token if it's expired.
  if ($client->isAccessTokenExpired()) {
    $client->refreshToken($client->getRefreshToken());
    file_put_contents($pathToAccessToken, $client->getAccessToken());
  }

  return $client;
}

$client = getClient();
$service = new Google_Service_Calendar($client);

// Print the next 10 events on the user's calendar.
$calendarId = 'primary';
$optParams = array(
      'maxResults' => 10,
      'orderBy' => 'startTime',
      'singleEvents' => TRUE,
      'timeMin' => date('c'),
);
$results = $service->events->listEvents($calendarId, $optParams);

if (count($results->getItems()) == 0) {
    print "No upcoming events found.\n";
} else {
    print "Upcoming events:\n";
    foreach ($results->getItems() as $event) {
        $start = $event->start->dateTime;
        if (empty($start)) {
          $start = $event->start->date;
        }
        printf("%s (%s)\n", $event->getSummary(), $start);
    }
}