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s3_set_cors.go
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/
s3_set_cors.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// snippet-start:[s3.go.set_cors.complete]
package main
// snippet-start:[s3.go.set_cors.imports]
import (
"flag"
"fmt"
"os"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
// snippet-end:[s3.go.set_cors.imports]
// Configures CORS rules for a bucket by setting the allowed
// HTTP methods.
//
// Requires the bucket name, and can also take a space separated
// list of HTTP methods.
//
// Usage:
//
// go run s3_set_cors.go -b BUCKET_NAME get put
func main() {
// snippet-start:[s3.go.set_cors.vars]
bucketPtr := flag.String("b", "", "Bucket to set CORS on, (required)")
flag.Parse()
if *bucketPtr == "" {
exitErrorf("-b <bucket> Bucket name required")
}
methods := filterMethods(flag.Args())
// snippet-end:[s3.go.set_cors.vars]
// Initialize a session
// snippet-start:[s3.go.set_cors.session]
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
svc := s3.New(sess)
// snippet-end:[s3.go.set_cors.session]
// Create a CORS rule for the bucket
// snippet-start:[s3.go.set_cors.rule]
rule := s3.CORSRule{
AllowedHeaders: aws.StringSlice([]string{"Authorization"}),
AllowedOrigins: aws.StringSlice([]string{"*"}),
MaxAgeSeconds: aws.Int64(3000),
// Add HTTP methods CORS request that were specified in the CLI.
AllowedMethods: aws.StringSlice(methods),
}
// snippet-end:[s3.go.set_cors.rule]
// Create the parameters for the PutBucketCors API call, add add
// the rule created to it.
// snippet-start:[s3.go.set_cors.put]
params := s3.PutBucketCorsInput{
Bucket: bucketPtr,
CORSConfiguration: &s3.CORSConfiguration{
CORSRules: []*s3.CORSRule{&rule},
},
}
_, err := svc.PutBucketCors(¶ms)
if err != nil {
// Print the error message
exitErrorf("Unable to set Bucket %q's CORS, %v", *bucketPtr, err)
}
// Print the updated CORS config for the bucket
fmt.Printf("Updated bucket %q CORS for %v\n", *bucketPtr, methods)
// snippet-end:[s3.go.set_cors.put]
}
// snippet-start:[s3.go.set_cors.exit]
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}
// snippet-end:[s3.go.set_cors.exit]
// snippet-start:[s3.go.set_cors.filter]
func filterMethods(methods []string) []string {
filtered := make([]string, 0, len(methods))
for _, m := range methods {
v := strings.ToUpper(m)
switch v {
case "POST", "GET", "PUT", "PATCH", "DELETE":
filtered = append(filtered, v)
}
}
return filtered
}
// snippet-end:[s3.go.set_cors.filter]
// snippet-end:[s3.go.set_cors.complete]