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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"
"github.com/disintegration/imaging"
"github.com/rwcarlsen/goexif/exif"
_ "golang.org/x/image/bmp"
"github.com/mattermost/mattermost-server/mlog"
"github.com/mattermost/mattermost-server/model"
"github.com/mattermost/mattermost-server/plugin"
"github.com/mattermost/mattermost-server/services/filesstore"
"github.com/mattermost/mattermost-server/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 = 1920
)
func (a *App) FileBackend() (filesstore.FileBackend, *model.AppError) {
license := a.License()
return filesstore.NewFileBackend(&a.Config().FileSettings, license != nil && *license.Features.Compliance)
}
func (a *App) ReadFile(path string) ([]byte, *model.AppError) {
backend, err := a.FileBackend()
if err != nil {
return nil, err
}
return backend.ReadFile(path)
}
// Caller must close the first return value
func (a *App) FileReader(path string) (io.ReadCloser, *model.AppError) {
backend, err := a.FileBackend()
if err != nil {
return nil, err
}
return backend.Reader(path)
}
func (a *App) FileExists(path string) (bool, *model.AppError) {
backend, err := a.FileBackend()
if err != nil {
return false, err
}
return backend.FileExists(path)
}
func (a *App) MoveFile(oldPath, newPath string) *model.AppError {
backend, err := a.FileBackend()
if err != nil {
return err
}
return backend.MoveFile(oldPath, newPath)
}
func (a *App) WriteFile(fr io.Reader, path string) (int64, *model.AppError) {
backend, err := a.FileBackend()
if err != nil {
return 0, err
}
return backend.WriteFile(fr, path)
}
func (a *App) RemoveFile(path string) *model.AppError {
backend, err := a.FileBackend()
if err != nil {
return err
}
return backend.RemoveFile(path)
}
func (a *App) 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 {
mlog.Error("Unable to decipher filename when migrating post to use FileInfos", mlog.String("post_id", post.Id), mlog.String("filename", 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], "/") {
mlog.Warn(
"Found an unusual filename when migrating post to use FileInfos",
mlog.String("post_id", post.Id),
mlog.String("channel_id", post.ChannelId),
mlog.String("user_id", post.UserId),
mlog.String("filename", 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
data, err := a.ReadFile(path)
if err != nil {
mlog.Error(
fmt.Sprintf("File not found when migrating post to use FileInfos, err=%v", err),
mlog.String("post_id", post.Id),
mlog.String("filename", filename),
mlog.String("path", path),
)
return nil
}
info, err := model.GetInfoForBytes(name, data)
if err != nil {
mlog.Warn(
fmt.Sprintf("Unable to fully decode file info when migrating post to use FileInfos, err=%v", err),
mlog.String("post_id", post.Id),
mlog.String("filename", filename),
)
}
// 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 (a *App) 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.
result := <-a.Srv.Store.Team().GetTeamsByUserId(post.UserId)
if result.Err != nil {
mlog.Error(fmt.Sprintf("Unable to get teams when migrating post to use FileInfo, err=%v", result.Err), mlog.String("post_id", post.Id))
return ""
}
teams := result.Data.([]*model.Team)
if len(teams) == 1 {
// The user has only one team so the post must've been sent from it
return teams[0].Id
}
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 := a.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 (a *App) MigrateFilenamesToFileInfos(post *model.Post) []*model.FileInfo {
if len(post.Filenames) == 0 {
mlog.Warn("Unable to migrate post to use FileInfos with an empty Filenames field", mlog.String("post_id", post.Id))
return []*model.FileInfo{}
}
cchan := a.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)
result := <-cchan
if result.Err != nil {
mlog.Error(
fmt.Sprintf("Unable to get channel when migrating post to use FileInfos, err=%v", result.Err),
mlog.String("post_id", post.Id),
mlog.String("channel_id", post.ChannelId),
)
return []*model.FileInfo{}
}
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 = a.FindTeamIdForFilename(post, filenames[0])
} else {
teamId = channel.TeamId
}
// Create FileInfo objects for this post
infos := make([]*model.FileInfo, 0, len(filenames))
if teamId == "" {
mlog.Error(
fmt.Sprintf("Unable to find team id for files when migrating post to use FileInfos, filenames=%v", filenames),
mlog.String("post_id", post.Id),
)
} else {
for _, filename := range filenames {
info := a.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()
result = <-a.Srv.Store.Post().Get(post.Id)
if result.Err != nil {
mlog.Error(fmt.Sprintf("Unable to get post when migrating post to use FileInfos, err=%v", result.Err), mlog.String("post_id", post.Id))
return []*model.FileInfo{}
}
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
result := <-a.Srv.Store.FileInfo().GetForPost(post.Id, true, false)
if result.Err != nil {
mlog.Error(fmt.Sprintf("Unable to get FileInfos for migrated post, err=%v", result.Err), mlog.String("post_id", post.Id))
return []*model.FileInfo{}
}
mlog.Debug("Post already migrated to use FileInfos", mlog.String("post_id", post.Id))
return result.Data.([]*model.FileInfo)
}
mlog.Debug("Migrating post to use FileInfos", mlog.String("post_id", post.Id))
savedInfos := make([]*model.FileInfo, 0, len(infos))
fileIds := make([]string, 0, len(filenames))
for _, info := range infos {
if result := <-a.Srv.Store.FileInfo().Save(info); result.Err != nil {
mlog.Error(
fmt.Sprintf("Unable to save file info when migrating post to use FileInfos, err=%v", result.Err),
mlog.String("post_id", post.Id),
mlog.String("file_info_id", info.Id),
mlog.String("file_info_path", info.Path),
)
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 := <-a.Srv.Store.Post().Update(newPost, post); result.Err != nil {
mlog.Error(fmt.Sprintf("Unable to save migrated post when migrating to use FileInfos, new_file_ids=%v, old_filenames=%v, err=%v", newPost.FileIds, post.Filenames, result.Err), mlog.String("post_id", post.Id))
return []*model.FileInfo{}
}
return savedInfos
}
func (a *App) GeneratePublicLink(siteURL string, info *model.FileInfo) string {
hash := GeneratePublicLinkHash(info.Id, *a.Config().FileSettings.PublicLinkSalt)
return fmt.Sprintf("%s/files/%v/public?h=%s", siteURL, 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 (a *App) UploadMultipartFiles(teamId string, channelId string, userId string, fileHeaders []*multipart.FileHeader, clientIds []string, now time.Time) (*model.FileUploadResponse, *model.AppError) {
files := make([]io.ReadCloser, len(fileHeaders))
filenames := make([]string, len(fileHeaders))
for i, fileHeader := range fileHeaders {
file, fileErr := fileHeader.Open()
if fileErr != nil {
return nil, model.NewAppError("UploadFiles", "api.file.upload_file.bad_parse.app_error", nil, fileErr.Error(), http.StatusBadRequest)
}
// Will be closed after UploadFiles returns
defer file.Close()
files[i] = file
filenames[i] = fileHeader.Filename
}
return a.UploadFiles(teamId, channelId, userId, files, filenames, clientIds, now)
}
// Uploads some files to the given team and channel as the given user. files and filenames should have
// the same length. clientIds should either not be provided or have the same length as files and filenames.
// The provided files should be closed by the caller so that they are not leaked.
func (a *App) UploadFiles(teamId string, channelId string, userId string, files []io.ReadCloser, filenames []string, clientIds []string, now time.Time) (*model.FileUploadResponse, *model.AppError) {
if len(*a.Config().FileSettings.DriverName) == 0 {
return nil, model.NewAppError("uploadFile", "api.file.upload_file.storage.app_error", nil, "", http.StatusNotImplemented)
}
if len(filenames) != len(files) || (len(clientIds) > 0 && len(clientIds) != len(files)) {
return nil, model.NewAppError("UploadFiles", "api.file.upload_file.incorrect_number_of_files.app_error", nil, "", http.StatusBadRequest)
}
resStruct := &model.FileUploadResponse{
FileInfos: []*model.FileInfo{},
ClientIds: []string{},
}
previewPathList := []string{}
thumbnailPathList := []string{}
imageDataList := [][]byte{}
for i, file := range files {
buf := bytes.NewBuffer(nil)
io.Copy(buf, file)
data := buf.Bytes()
info, data, err := a.DoUploadFileExpectModification(now, teamId, channelId, userId, filenames[i], 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])
}
}
a.HandleImages(previewPathList, thumbnailPathList, imageDataList)
return resStruct, nil
}
func (a *App) DoUploadFile(now time.Time, rawTeamId string, rawChannelId string, rawUserId string, rawFilename string, data []byte) (*model.FileInfo, *model.AppError) {
info, _, err := a.DoUploadFileExpectModification(now, rawTeamId, rawChannelId, rawUserId, rawFilename, data)
return info, err
}
func (a *App) DoUploadFileExpectModification(now time.Time, rawTeamId string, rawChannelId string, rawUserId string, rawFilename string, data []byte) (*model.FileInfo, []byte, *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, data, err
}
if orientation, err := getImageOrientation(bytes.NewReader(data)); err == nil &&
(orientation == RotatedCWMirrored ||
orientation == RotatedCCW ||
orientation == RotatedCCWMirrored ||
orientation == RotatedCW) {
info.Width, info.Height = info.Height, info.Width
}
info.Id = model.NewId()
info.CreatorId = userId
info.CreateAt = now.UnixNano() / int64(time.Millisecond)
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.NewAppError("uploadFile", "api.file.upload_file.large_image.app_error", map[string]interface{}{"Filename": filename}, "", http.StatusBadRequest)
return nil, data, err
}
nameWithoutExtension := filename[:strings.LastIndex(filename, ".")]
info.PreviewPath = pathPrefix + nameWithoutExtension + "_preview.jpg"
info.ThumbnailPath = pathPrefix + nameWithoutExtension + "_thumb.jpg"
}
if a.PluginsReady() {
var rejectionError *model.AppError
pluginContext := &plugin.Context{}
a.Plugins.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
var newBytes bytes.Buffer
replacementInfo, rejectionReason := hooks.FileWillBeUploaded(pluginContext, info, bytes.NewReader(data), &newBytes)
if rejectionReason != "" {
rejectionError = model.NewAppError("DoUploadFile", "File rejected by plugin. "+rejectionReason, nil, "", http.StatusBadRequest)
return false
}
if replacementInfo != nil {
info = replacementInfo
}
if newBytes.Len() != 0 {
data = newBytes.Bytes()
info.Size = int64(len(data))
}
return true
}, plugin.FileWillBeUploadedId)
if rejectionError != nil {
return nil, data, rejectionError
}
}
if _, err := a.WriteFile(bytes.NewReader(data), info.Path); err != nil {
return nil, data, err
}
if result := <-a.Srv.Store.FileInfo().Save(info); result.Err != nil {
return nil, data, result.Err
}
return info, data, nil
}
func (a *App) 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()
a.generateThumbnailImage(*img, path, width, height)
}(img, thumbnailPathList[i], width, height)
go func(img *image.Image, path string, width int) {
defer wg.Done()
a.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 {
mlog.Error(fmt.Sprintf("Unable to decode image err=%v", 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) {
exifData, err := exif.Decode(input)
if err != nil {
return Upright, err
}
tag, err := exifData.Get("Orientation")
if err != nil {
return Upright, err
}
orientation, err := tag.Int(0)
if err != nil {
return Upright, err
}
return orientation, nil
}
func (a *App) 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 {
mlog.Error(fmt.Sprintf("Unable to encode image as jpeg path=%v err=%v", thumbnailPath, err))
return
}
if _, err := a.WriteFile(buf, thumbnailPath); err != nil {
mlog.Error(fmt.Sprintf("Unable to upload thumbnail path=%v err=%v", thumbnailPath, err))
return
}
}
func (a *App) 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 {
mlog.Error(fmt.Sprintf("Unable to encode image as preview jpg err=%v", err), mlog.String("path", previewPath))
return
}
if _, err := a.WriteFile(buf, previewPath); err != nil {
mlog.Error(fmt.Sprintf("Unable to upload preview err=%v", err), mlog.String("path", previewPath))
return
}
}
func (a *App) GetFileInfo(fileId string) (*model.FileInfo, *model.AppError) {
result := <-a.Srv.Store.FileInfo().Get(fileId)
if result.Err != nil {
return nil, result.Err
}
return result.Data.(*model.FileInfo), nil
}
func (a *App) CopyFileInfos(userId string, fileIds []string) ([]string, *model.AppError) {
var newFileIds []string
now := model.GetMillis()
for _, fileId := range fileIds {
result := <-a.Srv.Store.FileInfo().Get(fileId)
if result.Err != nil {
return nil, result.Err
}
fileInfo := result.Data.(*model.FileInfo)
fileInfo.Id = model.NewId()
fileInfo.CreatorId = userId
fileInfo.CreateAt = now
fileInfo.UpdateAt = now
fileInfo.PostId = ""
if result := <-a.Srv.Store.FileInfo().Save(fileInfo); result.Err != nil {
return newFileIds, result.Err
}
newFileIds = append(newFileIds, fileInfo.Id)
}
return newFileIds, nil
}
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