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AWS SDK for Swift
Async Code Structure
All SDK operations are async. Use @main entry point:
swift
@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.
swift
// 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.ObjectDynamoDBClientTypes.AttributeValueCloudWatchClientTypes.MetricDatum,CloudWatchClientTypes.Dimension
swift
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 credentialsuseFIPS- Enable FIPS endpointsuseDualStack- Enable dual-stack endpointsawsRetryMode- Retry strategy (.adaptive, .standard, .legacy)maxAttempts- Max retry attemptsregion- AWS regionhttpClientEngine- Custom HTTP client (requires HttpClientConfiguration parameter):
swift
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
swift
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:
swift
import AWSS3
import SmithyWaitersAPI
let client = try await S3Client()
_ = try await client.waitUntilBucketExists(
options: WaiterOptions(maxWaitTime: 120.0),
input: HeadBucketInput(bucket: "my-bucket")
)Pagination
swift
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
swift
let url = try await client.presignedURLForGetObject(
input: GetObjectInput(bucket: "my-bucket", key: "file.pdf"),
expiration: 3600
)Common Operations
swift
// 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 ?? "")
}