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file.go
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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package utils
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"
l4g "github.com/alecthomas/log4go"
s3 "github.com/minio/minio-go"
"github.com/minio/minio-go/pkg/credentials"
"github.com/mattermost/mattermost-server/model"
)
const (
TEST_FILE_PATH = "/testfile"
)
// 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 s3New(endpoint, accessKey, secretKey string, secure bool, signV2 bool, region string) (*s3.Client, error) {
var creds *credentials.Credentials
if signV2 {
creds = credentials.NewStatic(accessKey, secretKey, "", credentials.SignatureV2)
} else {
creds = credentials.NewStatic(accessKey, secretKey, "", credentials.SignatureV4)
}
s3Clnt, err := s3.NewWithCredentials(endpoint, creds, secure, region)
if err != nil {
return nil, err
}
if *Cfg.FileSettings.AmazonS3Trace {
s3Clnt.TraceOn(os.Stdout)
}
return s3Clnt, nil
}
func TestFileConnection() *model.AppError {
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
bucket := Cfg.FileSettings.AmazonS3Bucket
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
if err != nil {
return model.NewAppError("TestFileConnection", "Bad connection to S3 or minio.", nil, err.Error(), http.StatusInternalServerError)
}
exists, err := s3Clnt.BucketExists(bucket)
if err != nil {
return model.NewAppError("TestFileConnection", "Error checking if bucket exists.", nil, err.Error(), http.StatusInternalServerError)
}
if !exists {
l4g.Warn("Bucket specified does not exist. Attempting to create...")
err := s3Clnt.MakeBucket(bucket, region)
if err != nil {
l4g.Error("Unable to create bucket.")
return model.NewAppError("TestFileConnection", "Unable to create bucket", nil, err.Error(), http.StatusInternalServerError)
}
}
l4g.Info("Connection to S3 or minio is good. Bucket exists.")
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
f := []byte("testingwrite")
if err := writeFileLocally(f, Cfg.FileSettings.Directory+TEST_FILE_PATH); err != nil {
return model.NewAppError("TestFileConnection", "Don't have permissions to write to local path specified or other error.", nil, err.Error(), http.StatusInternalServerError)
}
os.Remove(Cfg.FileSettings.Directory + TEST_FILE_PATH)
l4g.Info("Able to write files to local storage.")
} else {
return model.NewAppError("TestFileConnection", "No file driver selected.", nil, "", http.StatusInternalServerError)
}
return nil
}
func ReadFile(path string) ([]byte, *model.AppError) {
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
if err != nil {
return nil, model.NewAppError("ReadFile", "api.file.read_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
bucket := Cfg.FileSettings.AmazonS3Bucket
minioObject, err := s3Clnt.GetObject(bucket, path)
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
}
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
if f, err := ioutil.ReadFile(Cfg.FileSettings.Directory + path); err != nil {
return nil, model.NewAppError("ReadFile", "api.file.read_file.reading_local.app_error", nil, err.Error(), http.StatusInternalServerError)
} else {
return f, nil
}
} else {
return nil, model.NewAppError("ReadFile", "api.file.read_file.configured.app_error", nil, "", http.StatusNotImplemented)
}
}
func MoveFile(oldPath, newPath string) *model.AppError {
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
encrypt := false
if *Cfg.FileSettings.AmazonS3SSE && IsLicensed() && *License().Features.Compliance {
encrypt = true
}
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
if err != nil {
return model.NewAppError("moveFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
bucket := Cfg.FileSettings.AmazonS3Bucket
source := s3.NewSourceInfo(bucket, oldPath, nil)
destination, err := s3.NewDestinationInfo(bucket, newPath, nil, CopyMetadata(encrypt))
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.delete_from_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
if err = s3Clnt.RemoveObject(bucket, oldPath); err != nil {
return model.NewAppError("moveFile", "api.file.move_file.delete_from_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
if err := os.MkdirAll(filepath.Dir(Cfg.FileSettings.Directory+newPath), 0774); err != nil {
return model.NewAppError("moveFile", "api.file.move_file.rename.app_error", nil, err.Error(), http.StatusInternalServerError)
}
if err := os.Rename(Cfg.FileSettings.Directory+oldPath, Cfg.FileSettings.Directory+newPath); err != nil {
return model.NewAppError("moveFile", "api.file.move_file.rename.app_error", nil, err.Error(), http.StatusInternalServerError)
}
} else {
return model.NewAppError("moveFile", "api.file.move_file.configured.app_error", nil, "", http.StatusNotImplemented)
}
return nil
}
func WriteFile(f []byte, path string) *model.AppError {
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
encrypt := false
if *Cfg.FileSettings.AmazonS3SSE && IsLicensed() && *License().Features.Compliance {
encrypt = true
}
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
if err != nil {
return model.NewAppError("WriteFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
bucket := Cfg.FileSettings.AmazonS3Bucket
ext := filepath.Ext(path)
metaData := S3Metadata(encrypt, "binary/octet-stream")
if model.IsFileExtImage(ext) {
metaData = S3Metadata(encrypt, model.GetImageMimeType(ext))
}
_, err = s3Clnt.PutObjectWithMetadata(bucket, path, bytes.NewReader(f), metaData, nil)
if err != nil {
return model.NewAppError("WriteFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
if err := writeFileLocally(f, Cfg.FileSettings.Directory+path); err != nil {
return err
}
} else {
return model.NewAppError("WriteFile", "api.file.write_file.configured.app_error", nil, "", http.StatusNotImplemented)
}
return nil
}
func writeFileLocally(f []byte, path string) *model.AppError {
if err := os.MkdirAll(filepath.Dir(path), 0774); err != nil {
directory, _ := filepath.Abs(filepath.Dir(path))
return model.NewAppError("WriteFile", "api.file.write_file_locally.create_dir.app_error", nil, "directory="+directory+", err="+err.Error(), http.StatusInternalServerError)
}
if err := ioutil.WriteFile(path, f, 0644); err != nil {
return model.NewAppError("WriteFile", "api.file.write_file_locally.writing.app_error", nil, err.Error(), http.StatusInternalServerError)
}
return nil
}
func RemoveFile(path string) *model.AppError {
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
if err != nil {
return model.NewAppError("RemoveFile", "utils.file.remove_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
bucket := Cfg.FileSettings.AmazonS3Bucket
if err := s3Clnt.RemoveObject(bucket, path); err != nil {
return model.NewAppError("RemoveFile", "utils.file.remove_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
if err := os.Remove(Cfg.FileSettings.Directory + path); err != nil {
return model.NewAppError("RemoveFile", "utils.file.remove_file.local.app_error", nil, err.Error(), http.StatusInternalServerError)
}
} else {
return model.NewAppError("RemoveFile", "utils.file.remove_file.configured.app_error", nil, "", http.StatusNotImplemented)
}
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
}
// Returns a list of all the directories within the path directory provided.
func ListDirectory(path string) (*[]string, *model.AppError) {
var paths []string
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
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)
bucket := Cfg.FileSettings.AmazonS3Bucket
for object := range s3Clnt.ListObjects(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, "/"))
}
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
if fileInfos, err := ioutil.ReadDir(Cfg.FileSettings.Directory + path); err != nil {
return nil, model.NewAppError("ListDirectory", "utils.file.list_directory.local.app_error", nil, err.Error(), http.StatusInternalServerError)
} else {
for _, fileInfo := range fileInfos {
if fileInfo.IsDir() {
paths = append(paths, filepath.Join(path, fileInfo.Name()))
}
}
}
} else {
return nil, model.NewAppError("ListDirectory", "utils.file.list_directory.configured.app_error", nil, "", http.StatusInternalServerError)
}
return &paths, nil
}
func RemoveDirectory(path string) *model.AppError {
if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
endpoint := Cfg.FileSettings.AmazonS3Endpoint
accessKey := Cfg.FileSettings.AmazonS3AccessKeyId
secretKey := Cfg.FileSettings.AmazonS3SecretAccessKey
secure := *Cfg.FileSettings.AmazonS3SSL
signV2 := *Cfg.FileSettings.AmazonS3SignV2
region := Cfg.FileSettings.AmazonS3Region
s3Clnt, err := s3New(endpoint, accessKey, secretKey, secure, signV2, region)
if err != nil {
return model.NewAppError("RemoveDirectory", "utils.file.remove_directory.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
}
doneCh := make(chan struct{})
bucket := Cfg.FileSettings.AmazonS3Bucket
for err := range s3Clnt.RemoveObjects(bucket, getPathsFromObjectInfos(s3Clnt.ListObjects(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)
} else if *Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
if err := os.RemoveAll(Cfg.FileSettings.Directory + path); err != nil {
return model.NewAppError("RemoveDirectory", "utils.file.remove_directory.local.app_error", nil, err.Error(), http.StatusInternalServerError)
}
} else {
return model.NewAppError("RemoveDirectory", "utils.file.remove_directory.configured.app_error", nil, "", http.StatusNotImplemented)
}
return nil
}
func S3Metadata(encrypt bool, contentType string) map[string][]string {
metaData := make(map[string][]string)
if contentType != "" {
metaData["Content-Type"] = []string{"contentType"}
}
if encrypt {
metaData["x-amz-server-side-encryption"] = []string{"AES256"}
}
return metaData
}
func CopyMetadata(encrypt bool) map[string]string {
metaData := make(map[string]string)
metaData["x-amz-server-side-encryption"] = "AES256"
return metaData
}
// CopyFile will copy a file from src path to dst path.
// Overwrites any existing files at dst.
// Permissions are copied from file at src to the new file at dst.
func CopyFile(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
if e := out.Close(); e != nil {
err = e
}
}()
_, err = io.Copy(out, in)
if err != nil {
return
}
err = out.Sync()
if err != nil {
return
}
stat, err := os.Stat(src)
if err != nil {
return
}
err = os.Chmod(dst, stat.Mode())
if err != nil {
return
}
return
}
// CopyDir will copy a directory and all contained files and directories.
// src must exist and dst must not exist.
// Permissions are preserved when possible. Symlinks are skipped.
func CopyDir(src string, dst string) (err error) {
src = filepath.Clean(src)
dst = filepath.Clean(dst)
stat, err := os.Stat(src)
if err != nil {
return
}
if !stat.IsDir() {
return fmt.Errorf("source must be a directory")
}
_, err = os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return
}
if err == nil {
return fmt.Errorf("destination already exists")
}
err = os.MkdirAll(dst, stat.Mode())
if err != nil {
return
}
items, err := ioutil.ReadDir(src)
if err != nil {
return
}
for _, item := range items {
srcPath := filepath.Join(src, item.Name())
dstPath := filepath.Join(dst, item.Name())
if item.IsDir() {
err = CopyDir(srcPath, dstPath)
if err != nil {
return
}
} else {
if item.Mode()&os.ModeSymlink != 0 {
continue
}
err = CopyFile(srcPath, dstPath)
if err != nil {
return
}
}
}
return
}