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package fs
import (
"bytes"
"errors"
"io/ioutil"
"os"
"path"
"strings"
"time"
"go4.org/wkfs"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/nsheridan/cashier/server/config"
)
// Register the /s3/ filesystem as a well-known filesystem.
func Register(config *config.AWS) {
ac := &aws.Config{}
// If region is unset the SDK will attempt to read the region from the environment.
if config.Region != "" {
ac.Region = aws.String(config.Region)
}
// Attempt to get credentials from the cashier config.
// Otherwise check for standard credentials. If neither are present register the fs as broken.
// TODO: implement this as a provider.
if config.AccessKey != "" && config.SecretKey != "" {
ac.Credentials = credentials.NewStaticCredentials(config.AccessKey, config.SecretKey, "")
} else {
_, err := session.New().Config.Credentials.Get()
if err != nil {
registerBrokenFS(errors.New("aws credentials not found"))
return
}
}
sc := s3.New(session.New(ac))
if aws.StringValue(sc.Config.Region) == "" {
registerBrokenFS(errors.New("aws region configuration not found"))
return
}
wkfs.RegisterFS("/s3/", &s3FS{
sc: sc,
})
}
func registerBrokenFS(err error) {
wkfs.RegisterFS("/s3/", &s3FS{
err: err,
})
}
type s3FS struct {
sc *s3.S3
err error
}
func (fs *s3FS) parseName(name string) (bucket, fileName string, err error) {
if fs.err != nil {
return "", "", fs.err
}
name = strings.TrimPrefix(name, "/s3/")
i := strings.Index(name, "/")
if i < 0 {
return name, "", nil
}
return name[:i], name[i+1:], nil
}
// Open opens the named file for reading.
func (fs *s3FS) Open(name string) (wkfs.File, error) {
bucket, fileName, err := fs.parseName(name)
if err != nil {
return nil, err
}
obj, err := fs.sc.GetObject(&s3.GetObjectInput{
Bucket: &bucket,
Key: &fileName,
})
if err != nil {
return nil, err
}
defer obj.Body.Close()
slurp, err := ioutil.ReadAll(obj.Body)
if err != nil {
return nil, err
}
return &file{
name: name,
Reader: bytes.NewReader(slurp),
}, nil
}
func (fs *s3FS) Stat(name string) (os.FileInfo, error) { return fs.Lstat(name) }
func (fs *s3FS) Lstat(name string) (os.FileInfo, error) {
bucket, fileName, err := fs.parseName(name)
if err != nil {
return nil, err
}
obj, err := fs.sc.GetObject(&s3.GetObjectInput{
Bucket: &bucket,
Key: &fileName,
})
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "NoSuchKey" {
return nil, os.ErrNotExist
}
}
}
if err != nil {
return nil, err
}
return &statInfo{
name: path.Base(fileName),
size: *obj.ContentLength,
}, nil
}
func (fs *s3FS) MkdirAll(path string, perm os.FileMode) error { return nil }
func (fs *s3FS) OpenFile(name string, flag int, perm os.FileMode) (wkfs.FileWriter, error) {
return nil, errors.New("not implemented")
}
type statInfo struct {
name string
size int64
isDir bool
modtime time.Time
}
func (si *statInfo) IsDir() bool { return si.isDir }
func (si *statInfo) ModTime() time.Time { return si.modtime }
func (si *statInfo) Mode() os.FileMode { return 0644 }
func (si *statInfo) Name() string { return path.Base(si.name) }
func (si *statInfo) Size() int64 { return si.size }
func (si *statInfo) Sys() interface{} { return nil }
type file struct {
name string
*bytes.Reader
}
func (*file) Close() error { return nil }
func (f *file) Name() string { return path.Base(f.name) }
func (f *file) Stat() (os.FileInfo, error) {
panic("Stat not implemented on /s3/ files yet")
}
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