support s3 global client

[AllanZhengYP]

Is your feature request related to a problem? Please describe. Ported from comment: https://github.com/aws/aws-sdk-js-v3/issues/1802#issuecomment-747731632: n v2, we implemented a lot of hacky logic to make the S3 client behaves like a global client, but it may confuse the users, espacially those having knowledge of other AWS tools. So we deliberately removed the follow-the-redirect feature in v3. But it may bring some confusions when users see 301 response from S3. Other AWS SDKs support global client that allow users to make request to other regions.

Describe the solution you'd like The implementation will be similar to that in v2 s3 client. We can either ship it in a higher level library, or an SDK plugin, or a client config.

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[benji1298]

This issue is currently blocking us from upgrading to v3 of the SDK.

We access many S3 buckets from many different regions. In our v2 code, we are able to set up a single S3 client without specifying a region and access objects via Bucket & Key. It does not matter where those buckets live - the v2 S3 client handles any redirects. Now, in v3, we are getting 301 errors.

It will not be feasible to go through every bucket, identify the region, and create it's own S3 client with a hard-coded region. Are there any workarounds available to create a global client?

[ahnv]

@benji1298 We had a similar issue while moving from V2 SDK to V3 SDK, so we came with a workaround that leverages those 301 redirects and saves it in Redis for later use

export const getS3RegionalClient = async (s3Config: S3ClientConfig, params: GetObjectCommandInput) => {
  const { Bucket } = params

  if (s3Config.endpoint) {
    // Return S3 Client with us-east-1 region
    // See https://github.com/aws/aws-sdk-js-v3/issues/1845
  }

  let region = getRegionFromRedis(Bucket)
  if (!region) {
    const options: S3ClientConfig = { region: "us-east-1" }
    if (s3Config.credentials) {
      options.credentials = s3Config.credentials
    }
    const client = new S3(options)
    try {
      await client.getObject(params)
      region = "us-east-1"
    } catch (err: any) {
      // Us-East-1 Will return PermanentRedirect, irrespective of the fact if listbucket permission is given or not
      // as logically it seems that s3 keeps permissions at the region of buckets rather than keeping it globally across all data centers
      if (err.Code === "PermanentRedirect") {
        if (err.Endpoint) {
          const regionSlug: string = err.Endpoint
          const matches = regionSlug.match(new RegExp(S3RegionList.join("|")))
          if (matches?.[0]) {
            region = matches[0]
          }
        }
      }

      // without listBucket permission, the actual bucket will return the accessdenied permission
      if (err.name === "NoSuchKey" || err.name === "AccessDenied") {
        region = "us-east-1"
      }

      if (!region) {
        try {
          const { LocationConstraint } = await client.getBucketLocation({ Bucket })
          region = LocationConstraint || "us-east-1"
        } catch (locationError: any) {
          console.log(locationError)
        }

        console.log(err)
        throw Error("Unknown S3 Region")
      }
    }
    await saveRegionInRedis(Bucket, region)
}

[markandrus]

Here's another workaround that patches the S3Client's send method. It's not perfectly type safe and only supports the Promise interface, but it's something. It will probably break if you use the same S3Client to concurrently access buckets in multiple regions, which is why it would be nicer to handle this in the SDK natively.

function handlePermanentRedirect (client: S3Client): void {
  const originalSend: any = client.send

  client.send = async function updatedSend (...args: any[]): Promise<any> {
    try {
      return await originalSend.apply(client, args)
    } catch (error) {
      if (error instanceof S3ServiceException && (error.name === 'PermanentRedirect' || error.$response?.statusCode === 301)) {
        const region = error.$response?.headers['x-amz-bucket-region']
        if (region !== undefined) {
          (client.config.region as any) = region
          return await originalSend.apply(client, args)
        }
      }
      throw error
    }
  }
}

UPDATE: Something about this didn't play nicely with our minification process. We now maintain a lazily constructed Map from AWS region to S3Client. It's slightly safer. The logic for catching the PermanentRedirect is the same.

[yenfryherrerafeliz]

Related issue here.

[mshjri]

if you came here while trying to copy an object from one region to another, set the client's region as the destination bucket's region.

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