> ## Documentation Index
> Fetch the complete documentation index at: https://auth0.generaltranslation.app/llms.txt
> Use this file to discover all available pages before exploring further.

# リフレッシュトークンの使用

> 認可中に受け取ったリフレッシュトークンを使用する方法について説明します。

export const AuthCodeGroup = ({children, dropdown}) => {
  const [processedChildren, setProcessedChildren] = useState(children);
  useEffect(() => {
    let unsubscribe = null;
    function init() {
      unsubscribe = window.autorun(() => {
        const processChildren = node => {
          if (typeof node === "string") {
            let processedNode = node;
            for (const [key, value] of window.rootStore.variableStore.values.entries()) {
              processedNode = processedNode.replace(new RegExp(key, "g"), value);
            }
            return processedNode;
          } else if (Array.isArray(node)) {
            return node.map(processChildren);
          } else if (node && node.props && node.props.children) {
            return {
              ...node,
              props: {
                ...node.props,
                children: processChildren(node.props.children)
              }
            };
          }
          return node;
        };
        setProcessedChildren(processChildren(children));
      });
    }
    if (window.rootStore) {
      init();
    } else {
      window.addEventListener("adu:storeReady", init);
    }
    return () => {
      window.removeEventListener("adu:storeReady", init);
      unsubscribe?.();
    };
  }, [children]);
  return <CodeGroup dropdown={dropdown}>{processedChildren}</CodeGroup>;
};

export const AuthCodeBlock = ({filename, icon, language, highlight, children}) => {
  const [processedChildren, setProcessedChildren] = useState(children);
  useEffect(() => {
    let unsubscribe = null;
    function init() {
      unsubscribe = window.autorun(() => {
        let processedChildren = children;
        for (const [key, value] of window.rootStore.variableStore.values.entries()) {
          processedChildren = processedChildren.replace(new RegExp(key, "g"), value);
        }
        setProcessedChildren(processedChildren);
      });
    }
    if (window.rootStore) {
      init();
    } else {
      window.addEventListener("adu:storeReady", init);
    }
    return () => {
      window.removeEventListener("adu:storeReady", init);
      unsubscribe?.();
    };
  }, [children]);
  return <CodeBlock filename={filename} icon={icon} language={language} lines highlight={highlight}>
      {processedChildren}
    </CodeBlock>;
};

リフレッシュトークンは、ユーザーに再認証を求めることなく、ユーザーの新しいアクセストークンおよび/またはIDトークンを要求するために使用します。

通常、（サービスの中断を防ぐため）以前のアクセストークンが期限切れになる前に新しいアクセストークンを要求すべきですが、トークン交換には当社の[レート制限ポリシー](/docs/ja-JP/ja-jp/troubleshoot/customer-support/operational-policies/rate-limit-policy)が適用されるため、API呼び出しのたびには行いません。

リフレッシュトークンは、ユーザーの新しいIDトークンを要求するためにも使用でき、IDトークン内のクレームをリフレッシュする必要がある場合には必ず使用します。

<div id="call-the-api">
  ## APIの呼び出し
</div>

認証中に受け取ったリフレッシュトークンを新しいアクセストークンと交換するには、Auth0 Authentication APIでその[トークン取得API](/docs/ja-JP/ja-jp/api/authentication#refresh-token)を呼び出します。

Authentication APIで使える認証方法の詳細は、「[認証方法](https://auth0.com/docs/api/authentication#authentication-methods)」をお読みください。

<div id="use-basic-authentication">
  ### 基本認証の使用
</div>

<AuthCodeGroup>
  ```bash cURL theme={null}
  curl --request POST \
    --url 'https://{yourDomain}/oauth/token' \
    --header 'authorization: Basic {yourApplicationCredentials}' \
    --header 'content-type: application/x-www-form-urlencoded' \
    --data grant_type=refresh_token \
    --data 'client_id={yourClientId}' \
    --data 'refresh_token={yourRefreshToken}'
  ```

  ```csharp C# theme={null}
  var client = new RestClient("https://{yourDomain}/oauth/token");
  var request = new RestRequest(Method.POST);
  request.AddHeader("content-type", "application/x-www-form-urlencoded");
  request.AddHeader("authorization", "Basic {yourApplicationCredentials}");
  request.AddParameter("application/x-www-form-urlencoded", "grant_type=refresh_token&client_id={yourClientId}&refresh_token=%7ByourRefreshToken%7D", ParameterType.RequestBody);
  IRestResponse response = client.Execute(request);
  ```

  ```go Go theme={null}
  package main

  import (
  	"fmt"
  	"strings"
  	"net/http"
  	"io/ioutil"
  )

  func main() {

  	url := "https://{yourDomain}/oauth/token"

  	payload := strings.NewReader("grant_type=refresh_token&client_id={yourClientId}&refresh_token=%7ByourRefreshToken%7D")

  	req, _ := http.NewRequest("POST", url, payload)

  	req.Header.Add("content-type", "application/x-www-form-urlencoded")
  	req.Header.Add("authorization", "Basic {yourApplicationCredentials}")

  	res, _ := http.DefaultClient.Do(req)

  	defer res.Body.Close()
  	body, _ := ioutil.ReadAll(res.Body)

  	fmt.Println(res)
  	fmt.Println(string(body))

  }
  ```

  ```java Java theme={null}
  HttpResponse<String> response = Unirest.post("https://{yourDomain}/oauth/token")
    .header("content-type", "application/x-www-form-urlencoded")
    .header("authorization", "Basic {yourApplicationCredentials}")
    .body("grant_type=refresh_token&client_id={yourClientId}&refresh_token=%7ByourRefreshToken%7D")
    .asString();
  ```

  ```javascript Node.JS theme={null}
  var axios = require("axios").default;

  var options = {
    method: 'POST',
    url: 'https://{yourDomain}/oauth/token',
    headers: {
      'content-type': 'application/x-www-form-urlencoded',
      authorization: 'Basic {yourApplicationCredentials}'
    },
    data: new URLSearchParams({
      grant_type: 'refresh_token',
      client_id: '{yourClientId}',
      refresh_token: '{yourRefreshToken}'
    })
  };

  axios.request(options).then(function (response) {
    console.log(response.data);
  }).catch(function (error) {
    console.error(error);
  });
  ```

  ```objc Obj-C theme={null}
  #import <Foundation/Foundation.h>

  NSDictionary *headers = @{ @"content-type": @"application/x-www-form-urlencoded",
                             @"authorization": @"Basic {yourApplicationCredentials}" };

  NSMutableData *postData = [[NSMutableData alloc] initWithData:[@"grant_type=refresh_token" dataUsingEncoding:NSUTF8StringEncoding]];
  [postData appendData:[@"&client_id={yourClientId}" dataUsingEncoding:NSUTF8StringEncoding]];
  [postData appendData:[@"&refresh_token={yourRefreshToken}" dataUsingEncoding:NSUTF8StringEncoding]];

  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/oauth/token"]
                                                         cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                     timeoutInterval:10.0];
  [request setHTTPMethod:@"POST"];
  [request setAllHTTPHeaderFields:headers];
  [request setHTTPBody:postData];

  NSURLSession *session = [NSURLSession sharedSession];
  NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                              completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                  if (error) {
                                                      NSLog(@"%@", error);
                                                  } else {
                                                      NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                      NSLog(@"%@", httpResponse);
                                                  }
                                              }];
  [dataTask resume];
  ```

  ```php PHP theme={null}
  $curl = curl_init();

  curl_setopt_array($curl, [
    CURLOPT_URL => "https://{yourDomain}/oauth/token",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => "",
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_POSTFIELDS => "grant_type=refresh_token&client_id={yourClientId}&refresh_token=%7ByourRefreshToken%7D",
    CURLOPT_HTTPHEADER => [
      "authorization: Basic {yourApplicationCredentials}",
      "content-type: application/x-www-form-urlencoded"
    ],
  ]);

  $response = curl_exec($curl);
  $err = curl_error($curl);

  curl_close($curl);

  if ($err) {
    echo "cURL Error #:" . $err;
  } else {
    echo $response;
  }
  ```

  ```python Python theme={null}
  import http.client

  conn = http.client.HTTPSConnection("")

  payload = "grant_type=refresh_token&client_id={yourClientId}&refresh_token=%7ByourRefreshToken%7D"

  headers = {
      'content-type': "application/x-www-form-urlencoded",
      'authorization': "Basic {yourApplicationCredentials}"
      }

  conn.request("POST", "/{yourDomain}/oauth/token", payload, headers)

  res = conn.getresponse()
  data = res.read()

  print(data.decode("utf-8"))
  ```

  ```ruby Ruby theme={null}
  require 'uri'
  require 'net/http'
  require 'openssl'

  url = URI("https://{yourDomain}/oauth/token")

  http = Net::HTTP.new(url.host, url.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE

  request = Net::HTTP::Post.new(url)
  request["content-type"] = 'application/x-www-form-urlencoded'
  request["authorization"] = 'Basic {yourApplicationCredentials}'
  request.body = "grant_type=refresh_token&client_id={yourClientId}&refresh_token=%7ByourRefreshToken%7D"

  response = http.request(request)
  puts response.read_body
  ```

  ```swift Swift theme={null}
  import Foundation

  let headers = [
    "content-type": "application/x-www-form-urlencoded",
    "authorization": "Basic {yourApplicationCredentials}"
  ]

  let postData = NSMutableData(data: "grant_type=refresh_token".data(using: String.Encoding.utf8)!)
  postData.append("&client_id={yourClientId}".data(using: String.Encoding.utf8)!)
  postData.append("&refresh_token={yourRefreshToken}".data(using: String.Encoding.utf8)!)

  let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/oauth/token")! as URL,
                                          cachePolicy: .useProtocolCachePolicy,
                                      timeoutInterval: 10.0)
  request.httpMethod = "POST"
  request.allHTTPHeaderFields = headers
  request.httpBody = postData as Data

  let session = URLSession.shared
  let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
    if (error != nil) {
      print(error)
    } else {
      let httpResponse = response as? HTTPURLResponse
      print(httpResponse)
    }
  })

  dataTask.resume()
  ```
</AuthCodeGroup>

<div id="use-post-authentication">
  ### POST認証の使用
</div>

<AuthCodeGroup>
  ```bash cURL theme={null}
  curl --request POST \
    --url 'https://{yourDomain}/oauth/token' \
    --header 'content-type: application/x-www-form-urlencoded' \
    --data grant_type=refresh_token \
    --data 'client_id={yourClientId}' \
    --data 'client_secret={yourClientSecret}' \
    --data 'refresh_token={yourRefreshToken}'
  ```

  ```csharp C# theme={null}
  var client = new RestClient("https://{yourDomain}/oauth/token");
  var request = new RestRequest(Method.POST);
  request.AddHeader("content-type", "application/x-www-form-urlencoded");
  request.AddParameter("application/x-www-form-urlencoded", "grant_type=refresh_token&client_id={yourClientId}&client_secret=%7ByourClientSecret%7D&refresh_token=%7ByourRefreshToken%7D", ParameterType.RequestBody);
  IRestResponse response = client.Execute(request);
  ```

  ```go Go theme={null}
  package main

  import (
  	"fmt"
  	"strings"
  	"net/http"
  	"io/ioutil"
  )

  func main() {

  	url := "https://{yourDomain}/oauth/token"

  	payload := strings.NewReader("grant_type=refresh_token&client_id={yourClientId}&client_secret=%7ByourClientSecret%7D&refresh_token=%7ByourRefreshToken%7D")

  	req, _ := http.NewRequest("POST", url, payload)

  	req.Header.Add("content-type", "application/x-www-form-urlencoded")

  	res, _ := http.DefaultClient.Do(req)

  	defer res.Body.Close()
  	body, _ := ioutil.ReadAll(res.Body)

  	fmt.Println(res)
  	fmt.Println(string(body))

  }
  ```

  ```java Java theme={null}
  HttpResponse<String> response = Unirest.post("https://{yourDomain}/oauth/token")
    .header("content-type", "application/x-www-form-urlencoded")
    .body("grant_type=refresh_token&client_id={yourClientId}&client_secret=%7ByourClientSecret%7D&refresh_token=%7ByourRefreshToken%7D")
    .asString();
  ```

  ```javascript Node.JS theme={null}
  var axios = require("axios").default;

  var options = {
    method: 'POST',
    url: 'https://{yourDomain}/oauth/token',
    headers: {'content-type': 'application/x-www-form-urlencoded'},
    data: new URLSearchParams({
      grant_type: 'refresh_token',
      client_id: '{yourClientId}',
      client_secret: '{yourClientSecret}',
      refresh_token: '{yourRefreshToken}'
    })
  };

  axios.request(options).then(function (response) {
    console.log(response.data);
  }).catch(function (error) {
    console.error(error);
  });
  ```

  ```objc Obj-C theme={null}
  #import <Foundation/Foundation.h>

  NSDictionary *headers = @{ @"content-type": @"application/x-www-form-urlencoded" };

  NSMutableData *postData = [[NSMutableData alloc] initWithData:[@"grant_type=refresh_token" dataUsingEncoding:NSUTF8StringEncoding]];
  [postData appendData:[@"&client_id={yourClientId}" dataUsingEncoding:NSUTF8StringEncoding]];
  [postData appendData:[@"&client_secret={yourClientSecret}" dataUsingEncoding:NSUTF8StringEncoding]];
  [postData appendData:[@"&refresh_token={yourRefreshToken}" dataUsingEncoding:NSUTF8StringEncoding]];

  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/oauth/token"]
                                                         cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                     timeoutInterval:10.0];
  [request setHTTPMethod:@"POST"];
  [request setAllHTTPHeaderFields:headers];
  [request setHTTPBody:postData];

  NSURLSession *session = [NSURLSession sharedSession];
  NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                              completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                  if (error) {
                                                      NSLog(@"%@", error);
                                                  } else {
                                                      NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                      NSLog(@"%@", httpResponse);
                                                  }
                                              }];
  [dataTask resume];
  ```

  ```php PHP theme={null}
  $curl = curl_init();

  curl_setopt_array($curl, [
    CURLOPT_URL => "https://{yourDomain}/oauth/token",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => "",
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_POSTFIELDS => "grant_type=refresh_token&client_id={yourClientId}&client_secret=%7ByourClientSecret%7D&refresh_token=%7ByourRefreshToken%7D",
    CURLOPT_HTTPHEADER => [
      "content-type: application/x-www-form-urlencoded"
    ],
  ]);

  $response = curl_exec($curl);
  $err = curl_error($curl);

  curl_close($curl);

  if ($err) {
    echo "cURL Error #:" . $err;
  } else {
    echo $response;
  }
  ```

  ```python Python theme={null}
  import http.client

  conn = http.client.HTTPSConnection("")

  payload = "grant_type=refresh_token&client_id={yourClientId}&client_secret=%7ByourClientSecret%7D&refresh_token=%7ByourRefreshToken%7D"

  headers = { 'content-type': "application/x-www-form-urlencoded" }

  conn.request("POST", "/{yourDomain}/oauth/token", payload, headers)

  res = conn.getresponse()
  data = res.read()

  print(data.decode("utf-8"))
  ```

  ```ruby Ruby theme={null}
  require 'uri'
  require 'net/http'
  require 'openssl'

  url = URI("https://{yourDomain}/oauth/token")

  http = Net::HTTP.new(url.host, url.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE

  request = Net::HTTP::Post.new(url)
  request["content-type"] = 'application/x-www-form-urlencoded'
  request.body = "grant_type=refresh_token&client_id={yourClientId}&client_secret=%7ByourClientSecret%7D&refresh_token=%7ByourRefreshToken%7D"

  response = http.request(request)
  puts response.read_body
  ```

  ```swift Swift theme={null}
  import Foundation

  let headers = ["content-type": "application/x-www-form-urlencoded"]

  let postData = NSMutableData(data: "grant_type=refresh_token".data(using: String.Encoding.utf8)!)
  postData.append("&client_id={yourClientId}".data(using: String.Encoding.utf8)!)
  postData.append("&client_secret={yourClientSecret}".data(using: String.Encoding.utf8)!)
  postData.append("&refresh_token={yourRefreshToken}".data(using: String.Encoding.utf8)!)

  let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/oauth/token")! as URL,
                                          cachePolicy: .useProtocolCachePolicy,
                                      timeoutInterval: 10.0)
  request.httpMethod = "POST"
  request.allHTTPHeaderFields = headers
  request.httpBody = postData as Data

  let session = URLSession.shared
  let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
    if (error != nil) {
      print(error)
    } else {
      let httpResponse = response as? HTTPURLResponse
      print(httpResponse)
    }
  })

  dataTask.resume()
  ```
</AuthCodeGroup>

<div id="parameter-definition">
  ### パラメーターの定義
</div>

<table class="table">
  <thead>
    <tr>
      <th><strong>パラメーター</strong></th>
      <th><strong>説明</strong></th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>`grant_type`</td>
      <td>実行する付与タイプ。</td>
    </tr>

    <tr>
      <td>`client_id`</td>
      <td>アプリケーションのクライアントID。</td>
    </tr>

    <tr>
      <td>`client_secret`</td>
      <td>（任意）アプリケーションのクライアントシークレット。POSTトークン認証方式を使用する機密アプリケーションにのみ必要です。</td>
    </tr>

    <tr>
      <td>`refresh_token`</td>
      <td>交換するリフレッシュトークン。</td>
    </tr>
  </tbody>
</table>

応答には新しいアクセストークン、そのタイプ、そのライフタイム（秒）、および付与されたスコープが含まれます。最初のトークンのスコープに`openid`が含まれている場合には、新しいIDトークンも応答に含まれます。

```json lines theme={null}
{
      "access_token": "eyJ...MoQ",
      "expires_in": 86400,
      "scope": "openid offline_access",
      "id_token": "eyJ...0NE",
      "token_type": "Bearer"
    }
```

<div id="bypass-mfa">
  ## MFAのバイパス
</div>

[多要素認証（MFA）](/docs/ja-JP/ja-jp/secure/multi-factor-authentication)が有効で、リフレッシュトークンに失敗した場合は、以下の回避策があります。

```javascript lines theme={null}
exports.onExecutePostLogin = async (event, api) => {
  // This action will allow you to bypass the MFA logic for the refresh token exchange flow.

  if (event.transaction.protocol === "oauth2-refresh-token") {
    return;
  }

  //  Add your MFA logic
  //  For example: api.multifactor.enable("any");
};
```

現在のフローやプロトコルに応じて別途のロジックを実行やバイパスする必要がある場合には、サンプルコードをカスタマイズすることができます。

<div id="customize-mfa">
  ## もっと詳しく
</div>

* [リフレッシュトークンの取得](/docs/ja-JP/ja-jp/secure/tokens/refresh-tokens/get-refresh-tokens)
* [リフレッシュトークンの取り消し](/docs/ja-JP/ja-jp/secure/tokens/refresh-tokens/revoke-refresh-tokens)
* [リフレッシュトークンの有効期限を構成する](/docs/ja-JP/ja-jp/secure/tokens/refresh-tokens/configure-refresh-token-expiration)
* [Lock.Android:JSON Webトークンのリフレッシュ](/docs/ja-JP/ja-jp/libraries/lock-android/lock-android-refresh-jwt)