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s3driver.go
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s3driver.go
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package sftp
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
var BLOCK_DOWNLOADS_IP_ADDRESSES []string
type S3 interface {
ListObjectsV2(input *s3.ListObjectsV2Input) (*s3.ListObjectsV2Output, error)
DeleteObject(input *s3.DeleteObjectInput) (*s3.DeleteObjectOutput, error)
CopyObject(input *s3.CopyObjectInput) (*s3.CopyObjectOutput, error)
PutObject(input *s3.PutObjectInput) (*s3.PutObjectOutput, error)
GetObject(input *s3.GetObjectInput) (*s3.GetObjectOutput, error)
}
type S3Driver struct {
s3 S3
bucket string
prefix string
homePath string
remoteIPAddress string
kmsKeyID *string
lg Logger
}
func (d S3Driver) Stat(path string) (os.FileInfo, error) {
localPath, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return nil, err
}
resp, err := d.s3.ListObjectsV2(&s3.ListObjectsV2Input{
Bucket: aws.String(d.bucket),
Prefix: aws.String(localPath),
MaxKeys: aws.Int64(1),
})
if err != nil {
return nil, err
}
if resp.Contents == nil || *resp.KeyCount == 0 {
return nil, os.ErrNotExist
}
info := &fileInfo{
name: localPath,
mode: os.ModePerm,
size: *resp.Contents[0].Size,
mtime: *resp.Contents[0].LastModified,
}
if strings.HasSuffix(*resp.Contents[0].Key, "/") {
info.name = strings.TrimRight(info.name, "/")
info.mode = os.ModeDir
}
return info, nil
}
func (d S3Driver) ListDir(path string) ([]os.FileInfo, error) {
prefix, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return nil, err
}
if !strings.HasSuffix(prefix, "/") {
prefix = prefix + "/"
}
var nextContinuationToken *string
files := []os.FileInfo{}
for {
objects, err := d.s3.ListObjectsV2(&s3.ListObjectsV2Input{
Bucket: aws.String(d.bucket),
Prefix: aws.String(prefix),
Delimiter: aws.String("/"),
ContinuationToken: nextContinuationToken,
})
if err != nil {
return nil, err
}
for _, o := range objects.Contents {
if *o.Key == prefix {
continue
}
files = append(files, &fileInfo{
name: strings.TrimPrefix(*o.Key, prefix),
size: *o.Size,
mtime: *o.LastModified,
})
}
for _, o := range objects.CommonPrefixes {
files = append(files, &fileInfo{
name: strings.TrimSuffix(strings.TrimPrefix(*o.Prefix, prefix), "/"),
size: 4096,
mtime: time.Unix(1, 0),
mode: os.ModeDir,
})
}
if !*objects.IsTruncated {
return files, nil
}
nextContinuationToken = objects.NextContinuationToken
}
}
func (d S3Driver) DeleteDir(path string) error {
translatedPath, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return err
}
// s3 DeleteObject needs a trailing slash for directories
directoryPath := translatedPath
if !strings.HasSuffix(translatedPath, "/") {
directoryPath = translatedPath + "/"
}
_, err = d.s3.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(d.bucket),
Key: aws.String(directoryPath),
})
return err
}
func (d S3Driver) DeleteFile(path string) error {
translatedPath, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return err
}
_, err = d.s3.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(d.bucket),
Key: aws.String(translatedPath),
})
return err
}
func (d S3Driver) Rename(oldpath string, newpath string) error {
translatedOldpath, err := TranslatePath(d.prefix, d.homePath, oldpath)
if err != nil {
return err
}
translatedNewpath, err := TranslatePath(d.prefix, d.homePath, newpath)
if err != nil {
return err
}
input := &s3.CopyObjectInput{
Bucket: aws.String(d.bucket),
CopySource: aws.String(d.bucket + "/" + translatedOldpath),
Key: &translatedNewpath,
}
if d.kmsKeyID == nil {
input.ServerSideEncryption = aws.String("AES256")
} else {
input.ServerSideEncryption = aws.String("aws:kms")
input.SSEKMSKeyId = aws.String(*d.kmsKeyID)
}
if _, err := d.s3.CopyObject(input); err != nil {
return err
}
if _, err = d.s3.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(d.bucket),
Key: &translatedOldpath,
}); err != nil {
return err
}
return nil
}
func (d S3Driver) MakeDir(path string) error {
localPath, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return err
}
if !strings.HasSuffix(localPath, "/") {
localPath += "/"
}
input := &s3.PutObjectInput{
Bucket: aws.String(d.bucket),
Key: aws.String(localPath),
Body: bytes.NewReader([]byte{}),
}
if d.kmsKeyID == nil {
input.ServerSideEncryption = aws.String("AES256")
} else {
input.ServerSideEncryption = aws.String("aws:kms")
input.SSEKMSKeyId = aws.String(*d.kmsKeyID)
}
_, err = d.s3.PutObject(input)
return err
}
func (d S3Driver) GetFile(path string) (io.ReadCloser, error) {
denyList := map[string]string{
"5baac2eca47b2e0001fba7bc": "",
"57559919ba5df50100000371": "",
"5948272c6737440001c6d97f": "",
"5dc35c1bc06f8d000102e30f": "",
"5b9c35c6a47b2e0001fba77c": "",
"56a91ecf599456010000089e": "",
"5859884232aee60001eb363c": "",
"610c95d3f8fe797dd7069926": "",
"572227ff2ccd540100000942": "",
"5d94ff814070e90001c74ae9": "",
"562a767542fcde0100000cd3": "",
"5d727c3d091c7a0001b6167b": "",
"5a2eae046e18690001b2b671": "",
"596923cd7eb87f000134bd31": "",
"5d96661ed0c8470001afd962": "",
"5a7338b0e1d9a40001ec9f6b": "",
"544662a92b57f07b1d00003f": "",
"59b9f1145f63950001db2c2f": "",
"5efe7d59472dcc000193b4f1": "",
"5d65a3c947fec2000169542d": "",
"5d38d1d91269ea0001a7666f": "",
"5c0023e2d5e6320001392a1b": "",
"59a1e74bd0b14b0001af5bcc": "",
"57e153297406ba010000069c": "",
"57d9a194fc7c6301000003ec": "",
"55a7ffb439c12e0100000012": "",
"57222718dbfe7d01000009fd": "",
"5e46ef81836224000116c303": "",
"540dff9944ee2f1443004a7e": "",
"5f28cde4e3e8ee0001f65046": "",
"59cd5854f3a91c0001017a79": "",
"5ca25ee8f59f0b0001c3755a": "",
"6359869802626ad09401b198": "",
"635c47c9b773024858b7ce2e": "",
}
ip, port := getIPAndPort(d.remoteIPAddress)
if _, ok := denyList[d.prefix]; ok {
d.lg.ErrorD("s3-get-file-blocked-district", meta{
"district_id": d.prefix,
"s3_bucket": d.bucket,
"method": "GET",
"path": path,
"client-ip": ip,
"client-port": port,
})
return nil, fmt.Errorf("not supported")
}
for _, blockedIP := range BLOCK_DOWNLOADS_IP_ADDRESSES {
if ip == blockedIP {
d.lg.ErrorD("s3-get-file-blocked-ip", meta{
"district_id": d.prefix,
"s3_bucket": d.bucket,
"method": "GET",
"path": path,
"client-ip": ip,
"client-port": port,
})
return nil, fmt.Errorf("not supported")
}
}
localPath, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return nil, err
}
obj, err := d.s3.GetObject(&s3.GetObjectInput{
Bucket: aws.String(d.bucket),
Key: aws.String(localPath),
})
if err != nil {
return nil, err
}
if d.lg != nil {
d.lg.InfoD("s3-get-file-success", meta{
"district_id": d.prefix,
"s3_bucket": d.bucket,
"method": "GET",
"path": localPath,
"client-ip": ip,
"client-port": port,
"file_bytes_size": obj.ContentLength,
})
}
return obj.Body, nil
}
func (d S3Driver) PutFile(path string, r io.Reader) error {
localPath, err := TranslatePath(d.prefix, d.homePath, path)
if err != nil {
return err
}
rawData, err := ioutil.ReadAll(r)
if err != nil {
return err
}
input := &s3.PutObjectInput{
Bucket: aws.String(d.bucket),
Key: aws.String(localPath),
Body: bytes.NewReader(rawData),
}
if d.kmsKeyID == nil {
input.ServerSideEncryption = aws.String("AES256")
} else {
input.ServerSideEncryption = aws.String("aws:kms")
input.SSEKMSKeyId = aws.String(*d.kmsKeyID)
}
_, err = d.s3.PutObject(input)
if err != nil {
return err
}
ip, port := getIPAndPort(d.remoteIPAddress)
if d.lg != nil {
d.lg.InfoD("s3-put-file-success", meta{
"district_id": d.prefix,
"s3_bucket": d.bucket,
"method": "PUT",
"path": localPath,
"client-ip": ip,
"client-port": port,
"file_bytes_size": bytes.NewReader(rawData).Size(),
})
}
return nil
}
func (d S3Driver) RealPath(path string) string {
result, _ := TranslatePath("/", d.homePath, path)
return "/" + result
}
// translatePath takes in a S3 root prefix, a home directory, and either an absolute or relative path to append, and returns a cleaned and validated path.
// It will resolve things like '..' while disallowing the prefix to be escaped.
// It also preserves a single trailing slash if one is present, so it can be used on both directories and files.
func TranslatePath(prefix, home, path string) (string, error) {
if path == "" {
return filepath.Clean("/" + prefix + "/" + home), nil
}
var cleanPath string
if strings.HasPrefix(path, "/") {
cleanPath = filepath.Clean(prefix + path)
if !strings.HasPrefix(cleanPath, prefix) {
cleanPath = prefix
}
} else {
cleanPath = filepath.Clean("/" + prefix + "/" + home + filepath.Clean("/"+path))
}
// For some reason, filepath.Clean drops trailing /'s, so if there was one we have to put it back
if strings.HasSuffix(path, "/") {
cleanPath += "/"
}
return strings.TrimLeft(cleanPath, "/"), nil
}
// NewS3Driver creates a new S3Driver with the AWS credentials and S3 parameters.
// bucket: name of S3 bucket
// prefix: key within the S3 bucket, if applicable
// homePath: default home directory for user (can be different from prefix)
func NewS3Driver(
bucket,
prefix,
homePath,
region,
awsAccessKeyID,
awsSecretKey,
awsToken,
remoteIPAddress string,
kmsKeyID *string,
lg Logger,
) *S3Driver {
config := aws.NewConfig().
WithRegion(region).
WithCredentials(credentials.NewStaticCredentials(awsAccessKeyID, awsSecretKey, awsToken))
s3 := s3.New(session.New(), config)
blockDownloadIPAddressesStr := os.Getenv("BLOCK_DOWNLOADS_IP_ADDRESSES")
BLOCK_DOWNLOADS_IP_ADDRESSES = []string{}
for _, addr := range strings.Split(blockDownloadIPAddressesStr, ",") {
BLOCK_DOWNLOADS_IP_ADDRESSES = append(BLOCK_DOWNLOADS_IP_ADDRESSES, strings.TrimSpace(addr))
}
return &S3Driver{
s3: s3,
bucket: bucket,
prefix: prefix,
homePath: homePath,
remoteIPAddress: remoteIPAddress,
kmsKeyID: kmsKeyID,
lg: lg,
}
}
func getIPAndPort(combined string) (string, string) {
urlArray := strings.Split(combined, ":")
ip := ""
port := ""
if len(urlArray) > 0 {
ip = urlArray[0]
}
if len(urlArray) > 1 {
port = urlArray[1]
}
return ip, port
}