Skill

aws-sdk-swift-usage

Name: aws-sdk-swift-usage
Author: AWS (Amazon)

write Swift code using AWS SDK

Published by AWS (Amazon) Updated Jul 12

Covers Swift Engineering SDK AWS

Description

AWS SDK for Swift development patterns. Use when writing Swift code that uses AWS services via aws-sdk-swift package.

SKILL.md

AWS SDK for Swift

Async Code Structure

All SDK operations are async. Use @main entry point:

@main
struct Main {
    static func main() async throws {
        let client = try await S3Client()
        // ... async operations
    }
}

CRITICAL: Use Struct Config Types

NEVER use S3ClientConfiguration or DynamoDBClientConfiguration - these are DEPRECATED classes.

ALWAYS use the struct-based config types:

S3Client.S3ClientConfig (not S3ClientConfiguration)
DynamoDBClient.DynamoDBClientConfig (not DynamoDBClientConfiguration)
STSClient.STSClientConfig (not STSClientConfiguration)

Config parameters MUST be in declaration order. Region is ALWAYS required when creating a config. Check the service client source for exact order.

// CORRECT - struct config
let config = try await S3Client.S3ClientConfig(region: "us-west-2")
let client = S3Client(config: config)

// WRONG - deprecated class
// let config = try await S3Client.S3ClientConfiguration(region: "us-west-2")

Client Creation

All service clients follow the same pattern: <Service>Client with <Service>Client.<Service>ClientConfig.

Model types (structs/enums used in requests/responses) are namespaced under <Service>ClientTypes:

S3ClientTypes.Bucket, S3ClientTypes.Object
DynamoDBClientTypes.AttributeValue
CloudWatchClientTypes.MetricDatum, CloudWatchClientTypes.Dimension

import AWSS3
import AWSDynamoDB

// Simple - auto-detects region
let s3 = try await S3Client()
let dynamo = try await DynamoDBClient()

// With region
let s3 = try S3Client(region: "us-west-2")

// With config - parameters must be in declaration order
let config = try await S3Client.S3ClientConfig(
    useFIPS: true,
    awsRetryMode: .adaptive,
    maxAttempts: 5,
    region: "us-west-2"
)
let client = S3Client(config: config)

// With custom endpoint and credentials
let config = try await S3Client.S3ClientConfig(
    awsCredentialIdentityResolver: resolver,
    region: "us-west-2",
    endpoint: "https://s3.custom-endpoint.com"
)

Common config parameters (MUST follow declaration order):

awsCredentialIdentityResolver - Custom credentials
useFIPS - Enable FIPS endpoints
useDualStack - Enable dual-stack endpoints
awsRetryMode - Retry strategy (.adaptive, .standard, .legacy)
maxAttempts - Max retry attempts
region - AWS region

httpClientEngine - Custom HTTP client (requires HttpClientConfiguration parameter):

import ClientRuntime
let httpConfig = HttpClientConfiguration()
let httpClient = URLSessionHTTPClient(httpClientConfiguration: httpConfig)
let config = try await S3Client.S3ClientConfig(
    region: "us-east-1",
    httpClientEngine: httpClient
)

endpoint - Custom endpoint URL

For service-specific config options or exact parameter order, check Sources/Services/AWS<Service>/Sources/AWS<Service>/<Service>Client.swift in the SDK.

Credential Resolvers

import AWSSDKIdentity
import SmithyIdentity

// Static credentials - pass credential object directly
let creds = AWSCredentialIdentity(accessKey: "AKIA...", secret: "...")
let resolver = StaticAWSCredentialIdentityResolver(creds)

// Assume role - REQUIRES underlying resolver
let underlying = try DefaultAWSCredentialIdentityResolverChain()
let resolver = try STSAssumeRoleAWSCredentialIdentityResolver(
    awsCredentialIdentityResolver: underlying,
    roleArn: "arn:aws:iam::123456789012:role/MyRole",
    sessionName: "session-name"
)

// Use in config
let config = try await S3Client.S3ClientConfig(
    awsCredentialIdentityResolver: resolver,
    region: "us-west-2"
)

Waiters

Import SmithyWaitersAPI. WaiterOptions requires maxWaitTime parameter:

import AWSS3
import SmithyWaitersAPI

let client = try await S3Client()
_ = try await client.waitUntilBucketExists(
    options: WaiterOptions(maxWaitTime: 120.0),
    input: HeadBucketInput(bucket: "my-bucket")
)

Pagination

let input = ListObjectsV2Input(bucket: "my-bucket")
for try await page in client.listObjectsV2Paginated(input: input) {
    for object in page.contents ?? [] {
        print(object.key ?? "")
    }
}

Presigned URLs

let url = try await client.presignedURLForGetObject(
    input: GetObjectInput(bucket: "my-bucket", key: "file.pdf"),
    expiration: 3600
)

Common Operations

// Put object
_ = try await client.putObject(input: PutObjectInput(
    body: .data(data),
    bucket: "bucket",
    key: "key"
))

// Get object
let output = try await client.getObject(input: GetObjectInput(bucket: "bucket", key: "key"))
let data = try await output.body?.readData()

// List buckets
let response = try await client.listBuckets(input: ListBucketsInput())
for bucket in response.buckets ?? [] {
    print(bucket.name ?? "")
}

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