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// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api4
import (
"net/http"
"net/url"
"strconv"
l4g "github.com/alecthomas/log4go"
"github.com/mattermost/platform/app"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
)
const (
FILE_TEAM_ID = "noteam"
)
func InitFile() {
l4g.Debug(utils.T("api.file.init.debug"))
BaseRoutes.Files.Handle("", ApiSessionRequired(uploadFile)).Methods("POST")
BaseRoutes.File.Handle("", ApiSessionRequired(getFile)).Methods("GET")
}
func uploadFile(c *Context, w http.ResponseWriter, r *http.Request) {
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("channel_id")
return
}
channelId := props["channel_id"][0]
if len(channelId) == 0 {
c.SetInvalidParam("channel_id")
return
}
if !app.SessionHasPermissionToChannel(c.Session, channelId, model.PERMISSION_UPLOAD_FILE) {
c.SetPermissionError(model.PERMISSION_UPLOAD_FILE)
return
}
resStruct, err := app.UploadFiles(FILE_TEAM_ID, channelId, c.Session.UserId, m.File["files"], m.Value["client_ids"])
if err != nil {
c.Err = err
return
}
w.WriteHeader(http.StatusCreated)
w.Write([]byte(resStruct.ToJson()))
}
func getFile(c *Context, w http.ResponseWriter, r *http.Request) {
c.RequireFileId()
if c.Err != nil {
return
}
info, err := app.GetFileInfo(c.Params.FileId)
if err != nil {
c.Err = err
return
}
if info.CreatorId != c.Session.UserId && !app.SessionHasPermissionToChannelByPost(c.Session, info.PostId, model.PERMISSION_READ_CHANNEL) {
c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
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
}
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