Object Storage Service:オブジェクトが存在するかどうかの確認

次のサンプルコードは、オブジェクトが存在するかどうかを判断する方法の例を示します。

const OSS = require('ali-oss');

const client = new OSS({
  // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to oss-cn-hangzhou. 
  region: 'yourregion',
  // Obtain access credentials from environment variables. Before you run the sample code, make sure that you have configured environment variables OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET. 
  accessKeyId: process.env.OSS_ACCESS_KEY_ID,
  accessKeySecret: process.env.OSS_ACCESS_KEY_SECRET,
  authorizationV4: true,
  // Specify the name of the bucket. 
  bucket: 'yourBucketName',
});

async function isExistObject(name, options = {}) {
  try {
      await client.head(name, options);
      console.log('The object exists.')
   }  catch (error) {
      if (error.code === 'NoSuchKey') {
        console.log('The object does not exist.')
      }
   }
}
// Determine whether an object exists in an unversioned bucket. 
// Specify the full path of the object. Do not include the bucket name in the full path. Example: example/test.txt. 
const name = 'yourObjectName'
isExistObject(name)

// Determine whether an object with a specified version ID exists in a versioned bucket. 
const options = {
    // Specify the version ID of the object. 
    versionId: 'YourObjectVersionId' 
}
isExistObject(name, options)