/
s3.go
153 lines (132 loc) · 3.54 KB
/
s3.go
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package storage
import (
"bytes"
"context"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"path"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/pkg/errors"
)
type S3 struct {
Client *s3.S3
BucketName string
storageVersion string
hashFunc func(string) string
}
func NewS3(awsSession *session.Session, bucketName string) (*S3, error) {
if awsSession == nil {
var err error
awsSession, err = session.NewSession(&aws.Config{
Region: aws.String("us-west-2"),
CredentialsChainVerboseErrors: aws.Bool(true),
})
if err != nil {
return nil, errors.Wrap(err, "failed to create AWS session")
}
}
s := &S3{
Client: s3.New(awsSession),
BucketName: bucketName,
storageVersion: "v2",
hashFunc: func(s string) string {
h := sha256.Sum256([]byte(s))
return hex.EncodeToString(h[:])
},
}
_, err := s.Client.HeadBucket(&s3.HeadBucketInput{
Bucket: aws.String(s.BucketName),
})
if awsErr, ok := err.(awserr.Error); ok && awsErr.Code() == "NotFound" {
_, err = s.Client.CreateBucket(&s3.CreateBucketInput{
Bucket: aws.String(s.BucketName),
})
}
return s, err
}
func (s *S3) saveKey(ctx context.Context, short, url string) (err error) {
hashedShort := s.hashFunc(short)
s3BucketPrefix := path.Join(s.storageVersion, hashedShort)
_, err = s.Client.PutObjectWithContext(ctx, &s3.PutObjectInput{
Bucket: aws.String(s.BucketName),
Key: aws.String(path.Join(s3BucketPrefix, "long")),
Body: strings.NewReader(url),
ContentType: aws.String("text/plain"),
})
if err != nil {
return errors.Wrap(err, "failed to save long url to s3")
}
_, err = s.Client.PutObjectWithContext(ctx, &s3.PutObjectInput{
Bucket: aws.String(s.BucketName),
Key: aws.String(path.Join(s3BucketPrefix, "short")),
Body: strings.NewReader(short),
ContentType: aws.String("text/plain"),
})
if err != nil {
return errors.Wrap(err, "failed to save short url to s3")
}
changeLog, err := json.Marshal(
struct {
URL string
User string
}{
url,
"TODO",
},
)
if err != nil {
return errors.Wrap(err, "unable to format change history")
}
_, err = s.Client.PutObjectWithContext(ctx, &s3.PutObjectInput{
Bucket: aws.String(s.BucketName),
Key: aws.String(
path.Join(
s3BucketPrefix,
"change_history",
time.Now().Format(time.RFC3339Nano),
)),
Body: bytes.NewReader(changeLog),
ContentType: aws.String("application/json"),
})
if err != nil {
return errors.Wrap(err, "failed to save changelog to s3")
}
return nil
}
func (s *S3) SaveName(ctx context.Context, rawShort string, url string) error {
short, err := sanitizeShort(rawShort)
if err != nil {
return err
}
if _, err := validateURL(url); err != nil {
return err
}
return s.saveKey(ctx, short, url)
}
func (s *S3) Load(ctx context.Context, rawShort string) (string, error) {
short, err := sanitizeShort(rawShort)
if err != nil {
return "", err
}
resp, err := s.Client.GetObjectWithContext(ctx, &s3.GetObjectInput{
Bucket: aws.String(s.BucketName),
Key: aws.String(path.Join(s.storageVersion, s.hashFunc(short), "long")),
})
if awsErr, ok := err.(awserr.Error); ok && awsErr.Code() == "NoSuchKey" {
return "", ErrShortNotSet
}
if err != nil {
return "", err
}
var bb bytes.Buffer
if _, err := bb.ReadFrom(resp.Body); err != nil {
return "", errors.Wrap(err, "failed to read long url")
}
return bb.String(), err
}