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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api
import (
"bytes"
"image"
"image/color"
"image/draw"
_ "image/gif"
"image/jpeg"
"io"
"net/http"
"net/url"
"path/filepath"
"strconv"
"strings"
l4g "github.com/alecthomas/log4go"
"github.com/disintegration/imaging"
"github.com/gorilla/mux"
"github.com/mattermost/platform/app"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
"github.com/rwcarlsen/goexif/exif"
_ "golang.org/x/image/bmp"
)
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
)
func InitFile() {
l4g.Debug(utils.T("api.file.init.debug"))
BaseRoutes.TeamFiles.Handle("/upload", ApiUserRequired(uploadFile)).Methods("POST")
BaseRoutes.NeedFile.Handle("/get", ApiUserRequiredTrustRequester(getFile)).Methods("GET")
BaseRoutes.NeedFile.Handle("/get_thumbnail", ApiUserRequiredTrustRequester(getFileThumbnail)).Methods("GET")
BaseRoutes.NeedFile.Handle("/get_preview", ApiUserRequiredTrustRequester(getFilePreview)).Methods("GET")
BaseRoutes.NeedFile.Handle("/get_info", ApiUserRequired(getFileInfo)).Methods("GET")
BaseRoutes.NeedFile.Handle("/get_public_link", ApiUserRequired(getPublicLink)).Methods("GET")
BaseRoutes.Public.Handle("/files/{file_id:[A-Za-z0-9]+}/get", ApiAppHandlerTrustRequesterIndependent(getPublicFile)).Methods("GET")
BaseRoutes.Public.Handle("/files/get/{team_id:[A-Za-z0-9]+}/{channel_id:[A-Za-z0-9]+}/{user_id:[A-Za-z0-9]+}/{filename:([A-Za-z0-9]+/)?.+(\\.[A-Za-z0-9]{3,})?}", ApiAppHandlerTrustRequesterIndependent(getPublicFileOld)).Methods("GET")
}
func uploadFile(c *Context, w http.ResponseWriter, r *http.Request) {
if len(utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewLocAppError("uploadFile", "api.file.upload_file.storage.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
if r.ContentLength > *utils.Cfg.FileSettings.MaxFileSize {
c.Err = model.NewLocAppError("uploadFile", "api.file.upload_file.too_large.app_error", nil, "")
c.Err.StatusCode = http.StatusRequestEntityTooLarge
return
}
if err := r.ParseMultipartForm(*utils.Cfg.FileSettings.MaxFileSize); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
m := r.MultipartForm
props := m.Value
if len(props["channel_id"]) == 0 {
c.SetInvalidParam("uploadFile", "channel_id")
return
}
channelId := props["channel_id"][0]
if len(channelId) == 0 {
c.SetInvalidParam("uploadFile", "channel_id")
return
}
if !HasPermissionToChannelContext(c, channelId, model.PERMISSION_UPLOAD_FILE) {
return
}
resStruct := &model.FileUploadResponse{
FileInfos: []*model.FileInfo{},
ClientIds: []string{},
}
previewPathList := []string{}
thumbnailPathList := []string{}
imageDataList := [][]byte{}
for i, fileHeader := range m.File["files"] {
file, fileErr := fileHeader.Open()
defer file.Close()
if fileErr != nil {
http.Error(w, fileErr.Error(), http.StatusInternalServerError)
return
}
buf := bytes.NewBuffer(nil)
io.Copy(buf, file)
data := buf.Bytes()
info, err := doUploadFile(c.TeamId, channelId, c.Session.UserId, fileHeader.Filename, data)
if err != nil {
c.Err = err
return
}
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(m.Value["client_ids"]) > 0 {
resStruct.ClientIds = append(resStruct.ClientIds, m.Value["client_ids"][i])
}
}
handleImages(previewPathList, thumbnailPathList, imageDataList)
w.Write([]byte(resStruct.ToJson()))
}
func doUploadFile(teamId string, channelId string, userId string, rawFilename string, data []byte) (*model.FileInfo, *model.AppError) {
filename := filepath.Base(rawFilename)
info, err := model.GetInfoForBytes(filename, data)
if err != nil {
err.StatusCode = http.StatusBadRequest
return nil, err
}
info.Id = model.NewId()
info.CreatorId = userId
pathPrefix := "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 := app.WriteFile(data, info.Path); err != nil {
return nil, err
}
if result := <-app.Srv.Store.FileInfo().Save(info); result.Err != nil {
return nil, result.Err
}
return info, nil
}
func handleImages(previewPathList []string, thumbnailPathList []string, fileData [][]byte) {
for i, data := range fileData {
go func(i int, data []byte) {
img, width, height := prepareImage(fileData[i])
if img != nil {
go generateThumbnailImage(*img, thumbnailPathList[i], width, height)
go generatePreviewImage(*img, previewPathList[i], width)
}
}(i, data)
}
}
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(fileData)
switch orientation {
case UprightMirrored:
img = imaging.FlipH(img)
case UpsideDown:
img = imaging.Rotate180(img)
case UpsideDownMirrored:
img = imaging.FlipV(img)
case RotatedCWMirrored:
img = imaging.Transpose(img)
case RotatedCCW:
img = imaging.Rotate270(img)
case RotatedCCWMirrored:
img = imaging.Transverse(img)
case RotatedCW:
img = imaging.Rotate90(img)
}
return &img, width, height
}
func getImageOrientation(imageData []byte) (int, error) {
if exifData, err := exif.Decode(bytes.NewReader(imageData)); 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(utils.Cfg.FileSettings.ThumbnailWidth)
thumbHeight := float64(utils.Cfg.FileSettings.ThumbnailHeight)
imgWidth := float64(width)
imgHeight := float64(height)
var thumbnail image.Image
if imgHeight < thumbHeight && imgWidth < thumbWidth {
thumbnail = img
} else if imgHeight/imgWidth < thumbHeight/thumbWidth {
thumbnail = imaging.Resize(img, 0, utils.Cfg.FileSettings.ThumbnailHeight, imaging.Lanczos)
} else {
thumbnail = imaging.Resize(img, utils.Cfg.FileSettings.ThumbnailWidth, 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 := app.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 > int(utils.Cfg.FileSettings.PreviewWidth) {
preview = imaging.Resize(img, utils.Cfg.FileSettings.PreviewWidth, utils.Cfg.FileSettings.PreviewHeight, 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 := app.WriteFile(buf.Bytes(), previewPath); err != nil {
l4g.Error(utils.T("api.file.handle_images_forget.upload_preview.error"), previewPath, err)
return
}
}
func getFile(c *Context, w http.ResponseWriter, r *http.Request) {
info, err := getFileInfoForRequest(c, r, true)
if err != nil {
c.Err = err
return
}
if data, err := app.ReadFile(info.Path); err != nil {
c.Err = err
c.Err.StatusCode = http.StatusNotFound
} else if err := writeFileResponse(info.Name, info.MimeType, data, w, r); err != nil {
c.Err = err
return
}
}
func getFileThumbnail(c *Context, w http.ResponseWriter, r *http.Request) {
info, err := getFileInfoForRequest(c, r, true)
if err != nil {
c.Err = err
return
}
if info.ThumbnailPath == "" {
c.Err = model.NewLocAppError("getFileThumbnail", "api.file.get_file_thumbnail.no_thumbnail.app_error", nil, "file_id="+info.Id)
c.Err.StatusCode = http.StatusBadRequest
return
}
if data, err := app.ReadFile(info.ThumbnailPath); err != nil {
c.Err = err
c.Err.StatusCode = http.StatusNotFound
} else if err := writeFileResponse(info.Name, "", data, w, r); err != nil {
c.Err = err
return
}
}
func getFilePreview(c *Context, w http.ResponseWriter, r *http.Request) {
info, err := getFileInfoForRequest(c, r, true)
if err != nil {
c.Err = err
return
}
if info.PreviewPath == "" {
c.Err = model.NewLocAppError("getFilePreview", "api.file.get_file_preview.no_preview.app_error", nil, "file_id="+info.Id)
c.Err.StatusCode = http.StatusBadRequest
return
}
if data, err := app.ReadFile(info.PreviewPath); err != nil {
c.Err = err
c.Err.StatusCode = http.StatusNotFound
} else if err := writeFileResponse(info.Name, "", data, w, r); err != nil {
c.Err = err
return
}
}
func getFileInfo(c *Context, w http.ResponseWriter, r *http.Request) {
info, err := getFileInfoForRequest(c, r, true)
if err != nil {
c.Err = err
return
}
w.Header().Set("Cache-Control", "max-age=2592000, public")
w.Write([]byte(info.ToJson()))
}
func getPublicFile(c *Context, w http.ResponseWriter, r *http.Request) {
if !utils.Cfg.FileSettings.EnablePublicLink {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_file.public_disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
info, err := getFileInfoForRequest(c, r, false)
if err != nil {
c.Err = err
return
}
hash := r.URL.Query().Get("h")
if len(hash) > 0 {
correctHash := app.GeneratePublicLinkHash(info.Id, *utils.Cfg.FileSettings.PublicLinkSalt)
if hash != correctHash {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_file.public_invalid.app_error", nil, "")
c.Err.StatusCode = http.StatusBadRequest
return
}
} else {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_file.public_invalid.app_error", nil, "")
c.Err.StatusCode = http.StatusBadRequest
return
}
if data, err := app.ReadFile(info.Path); err != nil {
c.Err = err
c.Err.StatusCode = http.StatusNotFound
} else if err := writeFileResponse(info.Name, info.MimeType, data, w, r); err != nil {
c.Err = err
return
}
}
func getFileInfoForRequest(c *Context, r *http.Request, requireFileVisible bool) (*model.FileInfo, *model.AppError) {
if len(utils.Cfg.FileSettings.DriverName) == 0 {
err := model.NewLocAppError("getFileInfoForRequest", "api.file.get_file_info_for_request.storage.app_error", nil, "")
err.StatusCode = http.StatusNotImplemented
return nil, err
}
params := mux.Vars(r)
fileId := params["file_id"]
if len(fileId) != 26 {
return nil, NewInvalidParamError("getFileInfoForRequest", "file_id")
}
var info *model.FileInfo
if result := <-app.Srv.Store.FileInfo().Get(fileId); result.Err != nil {
return nil, result.Err
} else {
info = result.Data.(*model.FileInfo)
}
// only let users access files visible in a channel, unless they're the one who uploaded the file
if info.CreatorId != c.Session.UserId {
if len(info.PostId) == 0 {
err := model.NewLocAppError("getFileInfoForRequest", "api.file.get_file_info_for_request.no_post.app_error", nil, "file_id="+fileId)
err.StatusCode = http.StatusBadRequest
return nil, err
}
if requireFileVisible {
if !HasPermissionToChannelByPostContext(c, info.PostId, model.PERMISSION_READ_CHANNEL) {
return nil, c.Err
}
}
}
return info, nil
}
func getPublicFileOld(c *Context, w http.ResponseWriter, r *http.Request) {
if len(utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_public_file_old.storage.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
} else if !utils.Cfg.FileSettings.EnablePublicLink {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_file.public_disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
params := mux.Vars(r)
teamId := params["team_id"]
channelId := params["channel_id"]
userId := params["user_id"]
filename := params["filename"]
hash := r.URL.Query().Get("h")
if len(hash) > 0 {
correctHash := app.GeneratePublicLinkHash(filename, *utils.Cfg.FileSettings.PublicLinkSalt)
if hash != correctHash {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_file.public_invalid.app_error", nil, "")
c.Err.StatusCode = http.StatusBadRequest
return
}
} else {
c.Err = model.NewLocAppError("getPublicFile", "api.file.get_file.public_invalid.app_error", nil, "")
c.Err.StatusCode = http.StatusBadRequest
return
}
path := "teams/" + teamId + "/channels/" + channelId + "/users/" + userId + "/" + filename
var info *model.FileInfo
if result := <-app.Srv.Store.FileInfo().GetByPath(path); result.Err != nil {
c.Err = result.Err
return
} else {
info = result.Data.(*model.FileInfo)
}
if len(info.PostId) == 0 {
c.Err = model.NewLocAppError("getPublicFileOld", "api.file.get_public_file_old.no_post.app_error", nil, "file_id="+info.Id)
c.Err.StatusCode = http.StatusBadRequest
return
}
if data, err := app.ReadFile(info.Path); err != nil {
c.Err = err
c.Err.StatusCode = http.StatusNotFound
} else if err := writeFileResponse(info.Name, info.MimeType, data, w, r); err != nil {
c.Err = err
return
}
}
func writeFileResponse(filename string, contentType string, bytes []byte, w http.ResponseWriter, r *http.Request) *model.AppError {
w.Header().Set("Cache-Control", "max-age=2592000, public")
w.Header().Set("Content-Length", strconv.Itoa(len(bytes)))
if contentType != "" {
w.Header().Set("Content-Type", contentType)
} else {
w.Header().Del("Content-Type") // Content-Type will be set automatically by the http writer
}
w.Header().Set("Content-Disposition", "attachment;filename=\""+filename+"\"; filename*=UTF-8''"+url.QueryEscape(filename))
// prevent file links from being embedded in iframes
w.Header().Set("X-Frame-Options", "DENY")
w.Header().Set("Content-Security-Policy", "Frame-ancestors 'none'")
w.Write(bytes)
return nil
}
func getPublicLink(c *Context, w http.ResponseWriter, r *http.Request) {
if !utils.Cfg.FileSettings.EnablePublicLink {
c.Err = model.NewLocAppError("getPublicLink", "api.file.get_public_link.disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
info, err := getFileInfoForRequest(c, r, true)
if err != nil {
c.Err = err
return
}
if len(info.PostId) == 0 {
c.Err = model.NewLocAppError("getPublicLink", "api.file.get_public_link.no_post.app_error", nil, "file_id="+info.Id)
c.Err.StatusCode = http.StatusBadRequest
return
}
w.Write([]byte(model.StringToJson(app.GeneratePublicLink(c.GetSiteURL(), info))))
}
|