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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package utils
import (
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"
s3 "github.com/minio/minio-go"
"github.com/minio/minio-go/pkg/credentials"
"github.com/minio/minio-go/pkg/encrypt"
"github.com/mattermost/mattermost-server/mlog"
"github.com/mattermost/mattermost-server/model"
)
type S3FileBackend struct {
endpoint string
accessKey string
secretKey string
secure bool
signV2 bool
region string
bucket string
encrypt bool
trace bool
}
// Similar to s3.New() but allows initialization of signature v2 or signature v4 client.
// If signV2 input is false, function always returns signature v4.
//
// Additionally this function also takes a user defined region, if set
// disables automatic region lookup.
func (b *S3FileBackend) s3New() (*s3.Client, error) {
var creds *credentials.Credentials
if b.accessKey == "" && b.secretKey == "" {
creds = credentials.NewIAM("")
} else if b.signV2 {
creds = credentials.NewStatic(b.accessKey, b.secretKey, "", credentials.SignatureV2)
} else {
creds = credentials.NewStatic(b.accessKey, b.secretKey, "", credentials.SignatureV4)
}
s3Clnt, err := s3.NewWithCredentials(b.endpoint, creds, b.secure, b.region)
if err != nil {
return nil, err
}
if b.trace {
s3Clnt.TraceOn(os.Stdout)
}
return s3Clnt, nil
}
func (b *S3FileBackend) TestConnection() *model.AppError {
s3Clnt, err := b.s3New()
if err != nil {
return model.NewAppError("TestFileConnection", "Bad connection to S3 or minio.", nil, err.Error(), http.StatusInternalServerError)
}
exists, err := s3Clnt.BucketExists(b.bucket)
if err != nil {
return model.NewAppError("TestFileConnection", "Error checking if bucket exists.", nil, err.Error(), http.StatusInternalServerError)
}
if !exists {
mlog.Warn("Bucket specified does not exist. Attempting to create...")
err := s3Clnt.MakeBucket(b.bucket, b.region)
if err != nil {
mlog.Error("Unable to create bucket.")
return model.NewAppError("TestFileConnection", "Unable to create bucket", nil, err.Error(), http.StatusInternalServerError)
}
}
mlog.Info("Connection to S3 or minio is good. Bucket exists.")
return nil
}
func (b *S3FileBackend) ReadFile(path string) ([]byte, *model.AppError) {
s3Clnt, err := b.s3New()
if err != nil {
return nil, model.NewAppError("ReadFile", "api.file.read_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
minioObject, err := s3Clnt.GetObject(b.bucket, path, s3.GetObjectOptions{})
if err != nil {
return nil, model.NewAppError("ReadFile", "api.file.read_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
defer minioObject.Close()
if f, err := ioutil.ReadAll(minioObject); err != nil {
return nil, model.NewAppError("ReadFile", "api.file.read_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
} else {
return f, nil
}
}
func (b *S3FileBackend) CopyFile(oldPath, newPath string) *model.AppError {
s3Clnt, err := b.s3New()
if err != nil {
return model.NewAppError("copyFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
source := s3.NewSourceInfo(b.bucket, oldPath, nil)
destination, err := s3.NewDestinationInfo(b.bucket, newPath, encrypt.NewSSE(), nil)
if err != nil {
return model.NewAppError("copyFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
if err = s3Clnt.CopyObject(destination, source); err != nil {
return model.NewAppError("copyFile", "api.file.move_file.copy_within_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
return nil
}
func (b *S3FileBackend) MoveFile(oldPath, newPath string) *model.AppError {
s3Clnt, err := b.s3New()
if err != nil {
return model.NewAppError("moveFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
source := s3.NewSourceInfo(b.bucket, oldPath, nil)
destination, err := s3.NewDestinationInfo(b.bucket, newPath, encrypt.NewSSE(), nil)
if err != nil {
return model.NewAppError("moveFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
if err = s3Clnt.CopyObject(destination, source); err != nil {
return model.NewAppError("moveFile", "api.file.move_file.copy_within_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
if err = s3Clnt.RemoveObject(b.bucket, oldPath); err != nil {
return model.NewAppError("moveFile", "api.file.move_file.delete_from_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
return nil
}
func (b *S3FileBackend) WriteFile(fr io.Reader, path string) (int64, *model.AppError) {
s3Clnt, err := b.s3New()
if err != nil {
return 0, model.NewAppError("WriteFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
var contentType string
if ext := filepath.Ext(path); model.IsFileExtImage(ext) {
contentType = model.GetImageMimeType(ext)
} else {
contentType = "binary/octet-stream"
}
options := s3PutOptions(b.encrypt, contentType)
written, err := s3Clnt.PutObject(b.bucket, path, fr, -1, options)
if err != nil {
return written, model.NewAppError("WriteFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
return written, nil
}
func (b *S3FileBackend) RemoveFile(path string) *model.AppError {
s3Clnt, err := b.s3New()
if err != nil {
return model.NewAppError("RemoveFile", "utils.file.remove_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
if err := s3Clnt.RemoveObject(b.bucket, path); err != nil {
return model.NewAppError("RemoveFile", "utils.file.remove_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
return nil
}
func getPathsFromObjectInfos(in <-chan s3.ObjectInfo) <-chan string {
out := make(chan string, 1)
go func() {
defer close(out)
for {
info, done := <-in
if !done {
break
}
out <- info.Key
}
}()
return out
}
func (b *S3FileBackend) ListDirectory(path string) (*[]string, *model.AppError) {
var paths []string
s3Clnt, err := b.s3New()
if err != nil {
return nil, model.NewAppError("ListDirectory", "utils.file.list_directory.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
doneCh := make(chan struct{})
defer close(doneCh)
for object := range s3Clnt.ListObjects(b.bucket, path, false, doneCh) {
if object.Err != nil {
return nil, model.NewAppError("ListDirectory", "utils.file.list_directory.s3.app_error", nil, object.Err.Error(), http.StatusInternalServerError)
}
paths = append(paths, strings.Trim(object.Key, "/"))
}
return &paths, nil
}
func (b *S3FileBackend) RemoveDirectory(path string) *model.AppError {
s3Clnt, err := b.s3New()
if err != nil {
return model.NewAppError("RemoveDirectory", "utils.file.remove_directory.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
doneCh := make(chan struct{})
for err := range s3Clnt.RemoveObjects(b.bucket, getPathsFromObjectInfos(s3Clnt.ListObjects(b.bucket, path, true, doneCh))) {
if err.Err != nil {
doneCh <- struct{}{}
return model.NewAppError("RemoveDirectory", "utils.file.remove_directory.s3.app_error", nil, err.Err.Error(), http.StatusInternalServerError)
}
}
close(doneCh)
return nil
}
func s3PutOptions(encrypted bool, contentType string) s3.PutObjectOptions {
options := s3.PutObjectOptions{}
if encrypted {
options.ServerSideEncryption = encrypt.NewSSE()
}
options.ContentType = contentType
return options
}
func CheckMandatoryS3Fields(settings *model.FileSettings) *model.AppError {
if len(settings.AmazonS3Bucket) == 0 {
return model.NewAppError("S3File", "api.admin.test_s3.missing_s3_bucket", nil, "", http.StatusBadRequest)
}
// if S3 endpoint is not set call the set defaults to set that
if len(settings.AmazonS3Endpoint) == 0 {
settings.SetDefaults()
}
return nil
}
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