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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 app
import (
"bytes"
"crypto/sha256"
"encoding/base64"
"fmt"
"image"
"image/color"
"image/draw"
_ "image/gif"
"image/jpeg"
"io"
"mime/multipart"
"net/http"
"net/url"
"path/filepath"
"strings"
"sync"
"time"
l4g "github.com/alecthomas/log4go"
"github.com/disintegration/imaging"
"github.com/rwcarlsen/goexif/exif"
_ "golang.org/x/image/bmp"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
)
const (
/*
EXIF Image Orientations
1 2 3 4 5 6 7 8
888888 888888 88 88 8888888888 88 88 8888888888
88 88 88 88 88 88 88 88 88 88 88 88
8888 8888 8888 8888 88 8888888888 8888888888 88
88 88 88 88
88 88 888888 888888
*/
Upright = 1
UprightMirrored = 2
UpsideDown = 3
UpsideDownMirrored = 4
RotatedCWMirrored = 5
RotatedCCW = 6
RotatedCCWMirrored = 7
RotatedCW = 8
MaxImageSize = 6048 * 4032 // 24 megapixels, roughly 36MB as a raw image
IMAGE_THUMBNAIL_PIXEL_WIDTH = 120
IMAGE_THUMBNAIL_PIXEL_HEIGHT = 100
IMAGE_PREVIEW_PIXEL_WIDTH = 1024
)
func GetInfoForFilename(post *model.Post, teamId string, filename string) *model.FileInfo {
// Find the path from the Filename of the form /{channelId}/{userId}/{uid}/{nameWithExtension}
split := strings.SplitN(filename, "/", 5)
if len(split) < 5 {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.unexpected_filename.error"), post.Id, filename)
return nil
}
channelId := split[1]
userId := split[2]
oldId := split[3]
name, _ := url.QueryUnescape(split[4])
if split[0] != "" || split[1] != post.ChannelId || split[2] != post.UserId || strings.Contains(split[4], "/") {
l4g.Warn(utils.T("api.file.migrate_filenames_to_file_infos.mismatched_filename.warn"), post.Id, post.ChannelId, post.UserId, filename)
}
pathPrefix := fmt.Sprintf("teams/%s/channels/%s/users/%s/%s/", teamId, channelId, userId, oldId)
path := pathPrefix + name
// Open the file and populate the fields of the FileInfo
var info *model.FileInfo
if data, err := utils.ReadFile(path); err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.file_not_found.error"), post.Id, filename, path, err)
return nil
} else {
var err *model.AppError
info, err = model.GetInfoForBytes(name, data)
if err != nil {
l4g.Warn(utils.T("api.file.migrate_filenames_to_file_infos.info.app_error"), post.Id, filename, err)
}
}
// Generate a new ID because with the old system, you could very rarely get multiple posts referencing the same file
info.Id = model.NewId()
info.CreatorId = post.UserId
info.PostId = post.Id
info.CreateAt = post.CreateAt
info.UpdateAt = post.UpdateAt
info.Path = path
if info.IsImage() {
nameWithoutExtension := name[:strings.LastIndex(name, ".")]
info.PreviewPath = pathPrefix + nameWithoutExtension + "_preview.jpg"
info.ThumbnailPath = pathPrefix + nameWithoutExtension + "_thumb.jpg"
}
return info
}
func FindTeamIdForFilename(post *model.Post, filename string) string {
split := strings.SplitN(filename, "/", 5)
id := split[3]
name, _ := url.QueryUnescape(split[4])
// This post is in a direct channel so we need to figure out what team the files are stored under.
if result := <-Srv.Store.Team().GetTeamsByUserId(post.UserId); result.Err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.teams.app_error"), post.Id, result.Err)
} else if teams := result.Data.([]*model.Team); len(teams) == 1 {
// The user has only one team so the post must've been sent from it
return teams[0].Id
} else {
for _, team := range teams {
path := fmt.Sprintf("teams/%s/channels/%s/users/%s/%s/%s", team.Id, post.ChannelId, post.UserId, id, name)
if _, err := utils.ReadFile(path); err == nil {
// Found the team that this file was posted from
return team.Id
}
}
}
return ""
}
var fileMigrationLock sync.Mutex
// Creates and stores FileInfos for a post created before the FileInfos table existed.
func MigrateFilenamesToFileInfos(post *model.Post) []*model.FileInfo {
if len(post.Filenames) == 0 {
l4g.Warn(utils.T("api.file.migrate_filenames_to_file_infos.no_filenames.warn"), post.Id)
return []*model.FileInfo{}
}
cchan := Srv.Store.Channel().Get(post.ChannelId, true)
// There's a weird bug that rarely happens where a post ends up with duplicate Filenames so remove those
filenames := utils.RemoveDuplicatesFromStringArray(post.Filenames)
var channel *model.Channel
if result := <-cchan; result.Err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.channel.app_error"), post.Id, post.ChannelId, result.Err)
return []*model.FileInfo{}
} else {
channel = result.Data.(*model.Channel)
}
// Find the team that was used to make this post since its part of the file path that isn't saved in the Filename
var teamId string
if channel.TeamId == "" {
// This post was made in a cross-team DM channel so we need to find where its files were saved
teamId = FindTeamIdForFilename(post, filenames[0])
} else {
teamId = channel.TeamId
}
// Create FileInfo objects for this post
infos := make([]*model.FileInfo, 0, len(filenames))
if teamId == "" {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.team_id.error"), post.Id, filenames)
} else {
for _, filename := range filenames {
info := GetInfoForFilename(post, teamId, filename)
if info == nil {
continue
}
infos = append(infos, info)
}
}
// Lock to prevent only one migration thread from trying to update the post at once, preventing duplicate FileInfos from being created
fileMigrationLock.Lock()
defer fileMigrationLock.Unlock()
if result := <-Srv.Store.Post().Get(post.Id); result.Err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.get_post_again.app_error"), post.Id, result.Err)
return []*model.FileInfo{}
} else if newPost := result.Data.(*model.PostList).Posts[post.Id]; len(newPost.Filenames) != len(post.Filenames) {
// Another thread has already created FileInfos for this post, so just return those
if result := <-Srv.Store.FileInfo().GetForPost(post.Id, true, false); result.Err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.get_post_file_infos_again.app_error"), post.Id, result.Err)
return []*model.FileInfo{}
} else {
l4g.Debug(utils.T("api.file.migrate_filenames_to_file_infos.not_migrating_post.debug"), post.Id)
return result.Data.([]*model.FileInfo)
}
}
l4g.Debug(utils.T("api.file.migrate_filenames_to_file_infos.migrating_post.debug"), post.Id)
savedInfos := make([]*model.FileInfo, 0, len(infos))
fileIds := make([]string, 0, len(filenames))
for _, info := range infos {
if result := <-Srv.Store.FileInfo().Save(info); result.Err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.save_file_info.app_error"), post.Id, info.Id, info.Path, result.Err)
continue
}
savedInfos = append(savedInfos, info)
fileIds = append(fileIds, info.Id)
}
// Copy and save the updated post
newPost := &model.Post{}
*newPost = *post
newPost.Filenames = []string{}
newPost.FileIds = fileIds
// Update Posts to clear Filenames and set FileIds
if result := <-Srv.Store.Post().Update(newPost, post); result.Err != nil {
l4g.Error(utils.T("api.file.migrate_filenames_to_file_infos.save_post.app_error"), post.Id, newPost.FileIds, post.Filenames, result.Err)
return []*model.FileInfo{}
} else {
return savedInfos
}
}
func GeneratePublicLink(siteURL string, info *model.FileInfo) string {
hash := GeneratePublicLinkHash(info.Id, *utils.Cfg.FileSettings.PublicLinkSalt)
return fmt.Sprintf("%s/files/%v/public?h=%s", siteURL, info.Id, hash)
}
func GeneratePublicLinkV3(siteURL string, info *model.FileInfo) string {
hash := GeneratePublicLinkHash(info.Id, *utils.Cfg.FileSettings.PublicLinkSalt)
return fmt.Sprintf("%s%s/public/files/%v/get?h=%s", siteURL, model.API_URL_SUFFIX_V3, info.Id, hash)
}
func GeneratePublicLinkHash(fileId, salt string) string {
hash := sha256.New()
hash.Write([]byte(salt))
hash.Write([]byte(fileId))
return base64.RawURLEncoding.EncodeToString(hash.Sum(nil))
}
func UploadFiles(teamId string, channelId string, userId string, fileHeaders []*multipart.FileHeader, clientIds []string) (*model.FileUploadResponse, *model.AppError) {
if len(*utils.Cfg.FileSettings.DriverName) == 0 {
return nil, model.NewAppError("uploadFile", "api.file.upload_file.storage.app_error", nil, "", http.StatusNotImplemented)
}
resStruct := &model.FileUploadResponse{
FileInfos: []*model.FileInfo{},
ClientIds: []string{},
}
previewPathList := []string{}
thumbnailPathList := []string{}
imageDataList := [][]byte{}
for i, fileHeader := range fileHeaders {
file, fileErr := fileHeader.Open()
defer file.Close()
if fileErr != nil {
return nil, model.NewAppError("UploadFiles", "api.file.upload_file.bad_parse.app_error", nil, fileErr.Error(), http.StatusBadRequest)
}
buf := bytes.NewBuffer(nil)
io.Copy(buf, file)
data := buf.Bytes()
info, err := DoUploadFile(time.Now(), teamId, channelId, userId, fileHeader.Filename, data)
if err != nil {
return nil, err
}
if info.PreviewPath != "" || info.ThumbnailPath != "" {
previewPathList = append(previewPathList, info.PreviewPath)
thumbnailPathList = append(thumbnailPathList, info.ThumbnailPath)
imageDataList = append(imageDataList, data)
}
resStruct.FileInfos = append(resStruct.FileInfos, info)
if len(clientIds) > 0 {
resStruct.ClientIds = append(resStruct.ClientIds, clientIds[i])
}
}
HandleImages(previewPathList, thumbnailPathList, imageDataList)
return resStruct, nil
}
func DoUploadFile(now time.Time, rawTeamId string, rawChannelId string, rawUserId string, rawFilename string, data []byte) (*model.FileInfo, *model.AppError) {
filename := filepath.Base(rawFilename)
teamId := filepath.Base(rawTeamId)
channelId := filepath.Base(rawChannelId)
userId := filepath.Base(rawUserId)
info, err := model.GetInfoForBytes(filename, data)
if err != nil {
err.StatusCode = http.StatusBadRequest
return nil, err
}
info.Id = model.NewId()
info.CreatorId = userId
pathPrefix := now.Format("20060102") + "/teams/" + teamId + "/channels/" + channelId + "/users/" + userId + "/" + info.Id + "/"
info.Path = pathPrefix + filename
if info.IsImage() {
// Check dimensions before loading the whole thing into memory later on
if info.Width*info.Height > MaxImageSize {
err := model.NewLocAppError("uploadFile", "api.file.upload_file.large_image.app_error", map[string]interface{}{"Filename": filename}, "")
err.StatusCode = http.StatusBadRequest
return nil, err
}
nameWithoutExtension := filename[:strings.LastIndex(filename, ".")]
info.PreviewPath = pathPrefix + nameWithoutExtension + "_preview.jpg"
info.ThumbnailPath = pathPrefix + nameWithoutExtension + "_thumb.jpg"
}
if err := utils.WriteFile(data, info.Path); err != nil {
return nil, err
}
if result := <-Srv.Store.FileInfo().Save(info); result.Err != nil {
return nil, result.Err
}
return info, nil
}
func HandleImages(previewPathList []string, thumbnailPathList []string, fileData [][]byte) {
wg := new(sync.WaitGroup)
for i := range fileData {
img, width, height := prepareImage(fileData[i])
if img != nil {
wg.Add(2)
go func(img *image.Image, path string, width int, height int) {
defer wg.Done()
generateThumbnailImage(*img, path, width, height)
}(img, thumbnailPathList[i], width, height)
go func(img *image.Image, path string, width int) {
defer wg.Done()
generatePreviewImage(*img, path, width)
}(img, previewPathList[i], width)
}
}
wg.Wait()
}
func prepareImage(fileData []byte) (*image.Image, int, int) {
// Decode image bytes into Image object
img, imgType, err := image.Decode(bytes.NewReader(fileData))
if err != nil {
l4g.Error(utils.T("api.file.handle_images_forget.decode.error"), err)
return nil, 0, 0
}
width := img.Bounds().Dx()
height := img.Bounds().Dy()
// Fill in the background of a potentially-transparent png file as white
if imgType == "png" {
dst := image.NewRGBA(img.Bounds())
draw.Draw(dst, dst.Bounds(), image.NewUniform(color.White), image.Point{}, draw.Src)
draw.Draw(dst, dst.Bounds(), img, img.Bounds().Min, draw.Over)
img = dst
}
// Flip the image to be upright
orientation, _ := getImageOrientation(bytes.NewReader(fileData))
img = makeImageUpright(img, orientation)
return &img, width, height
}
func makeImageUpright(img image.Image, orientation int) image.Image {
switch orientation {
case UprightMirrored:
return imaging.FlipH(img)
case UpsideDown:
return imaging.Rotate180(img)
case UpsideDownMirrored:
return imaging.FlipV(img)
case RotatedCWMirrored:
return imaging.Transpose(img)
case RotatedCCW:
return imaging.Rotate270(img)
case RotatedCCWMirrored:
return imaging.Transverse(img)
case RotatedCW:
return imaging.Rotate90(img)
default:
return img
}
}
func getImageOrientation(input io.Reader) (int, error) {
if exifData, err := exif.Decode(input); err != nil {
return Upright, err
} else {
if tag, err := exifData.Get("Orientation"); err != nil {
return Upright, err
} else {
orientation, err := tag.Int(0)
if err != nil {
return Upright, err
} else {
return orientation, nil
}
}
}
}
func generateThumbnailImage(img image.Image, thumbnailPath string, width int, height int) {
thumbWidth := float64(IMAGE_THUMBNAIL_PIXEL_WIDTH)
thumbHeight := float64(IMAGE_THUMBNAIL_PIXEL_HEIGHT)
imgWidth := float64(width)
imgHeight := float64(height)
var thumbnail image.Image
if imgHeight < IMAGE_THUMBNAIL_PIXEL_HEIGHT && imgWidth < thumbWidth {
thumbnail = img
} else if imgHeight/imgWidth < thumbHeight/thumbWidth {
thumbnail = imaging.Resize(img, 0, IMAGE_THUMBNAIL_PIXEL_HEIGHT, imaging.Lanczos)
} else {
thumbnail = imaging.Resize(img, IMAGE_THUMBNAIL_PIXEL_WIDTH, 0, imaging.Lanczos)
}
buf := new(bytes.Buffer)
if err := jpeg.Encode(buf, thumbnail, &jpeg.Options{Quality: 90}); err != nil {
l4g.Error(utils.T("api.file.handle_images_forget.encode_jpeg.error"), thumbnailPath, err)
return
}
if err := utils.WriteFile(buf.Bytes(), thumbnailPath); err != nil {
l4g.Error(utils.T("api.file.handle_images_forget.upload_thumb.error"), thumbnailPath, err)
return
}
}
func generatePreviewImage(img image.Image, previewPath string, width int) {
var preview image.Image
if width > IMAGE_PREVIEW_PIXEL_WIDTH {
preview = imaging.Resize(img, IMAGE_PREVIEW_PIXEL_WIDTH, 0, imaging.Lanczos)
} else {
preview = img
}
buf := new(bytes.Buffer)
if err := jpeg.Encode(buf, preview, &jpeg.Options{Quality: 90}); err != nil {
l4g.Error(utils.T("api.file.handle_images_forget.encode_preview.error"), previewPath, err)
return
}
if err := utils.WriteFile(buf.Bytes(), previewPath); err != nil {
l4g.Error(utils.T("api.file.handle_images_forget.upload_preview.error"), previewPath, err)
return
}
}
func GetFileInfo(fileId string) (*model.FileInfo, *model.AppError) {
if result := <-Srv.Store.FileInfo().Get(fileId); result.Err != nil {
return nil, result.Err
} else {
return result.Data.(*model.FileInfo), nil
}
}