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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package model
import (
"encoding/json"
"image"
"image/gif"
"io"
"mime"
"net/http"
"path/filepath"
"strings"
)
const (
FILEINFO_SORT_BY_CREATED = "CreateAt"
FILEINFO_SORT_BY_SIZE = "Size"
)
// GetFileInfosOptions contains options for getting FileInfos
type GetFileInfosOptions struct {
// UserIds optionally limits the FileInfos to those created by the given users.
UserIds []string `json:"user_ids"`
// ChannelIds optionally limits the FileInfos to those created in the given channels.
ChannelIds []string `json:"channel_ids"`
// Since optionally limits FileInfos to those created at or after the given time, specified as Unix time in milliseconds.
Since int64 `json:"since"`
// IncludeDeleted if set includes deleted FileInfos.
IncludeDeleted bool `json:"include_deleted"`
// SortBy sorts the FileInfos by this field. The default is to sort by date created.
SortBy string `json:"sort_by"`
// SortDescending changes the sort direction to descending order when true.
SortDescending bool `json:"sort_descending"`
}
type FileInfo struct {
Id string `json:"id"`
CreatorId string `json:"user_id"`
PostId string `json:"post_id,omitempty"`
ChannelId string `db:"-" json:"channel_id"`
CreateAt int64 `json:"create_at"`
UpdateAt int64 `json:"update_at"`
DeleteAt int64 `json:"delete_at"`
Path string `json:"-"` // not sent back to the client
ThumbnailPath string `json:"-"` // not sent back to the client
PreviewPath string `json:"-"` // not sent back to the client
Name string `json:"name"`
Extension string `json:"extension"`
Size int64 `json:"size"`
MimeType string `json:"mime_type"`
Width int `json:"width,omitempty"`
Height int `json:"height,omitempty"`
HasPreviewImage bool `json:"has_preview_image,omitempty"`
MiniPreview *[]byte `json:"mini_preview"` // declared as *[]byte to avoid postgres/mysql differences in deserialization
Content string `json:"-"`
RemoteId *string `json:"remote_id"`
}
func (fi *FileInfo) ToJson() string {
b, _ := json.Marshal(fi)
return string(b)
}
func FileInfoFromJson(data io.Reader) *FileInfo {
decoder := json.NewDecoder(data)
var fi FileInfo
if err := decoder.Decode(&fi); err != nil {
return nil
}
return &fi
}
func FileInfosToJson(infos []*FileInfo) string {
b, _ := json.Marshal(infos)
return string(b)
}
func FileInfosFromJson(data io.Reader) []*FileInfo {
decoder := json.NewDecoder(data)
var infos []*FileInfo
if err := decoder.Decode(&infos); err != nil {
return nil
}
return infos
}
func (fi *FileInfo) PreSave() {
if fi.Id == "" {
fi.Id = NewId()
}
if fi.CreateAt == 0 {
fi.CreateAt = GetMillis()
}
if fi.UpdateAt < fi.CreateAt {
fi.UpdateAt = fi.CreateAt
}
if fi.RemoteId == nil {
fi.RemoteId = NewString("")
}
}
func (fi *FileInfo) IsValid() *AppError {
if !IsValidId(fi.Id) {
return NewAppError("FileInfo.IsValid", "model.file_info.is_valid.id.app_error", nil, "", http.StatusBadRequest)
}
if !IsValidId(fi.CreatorId) && fi.CreatorId != "nouser" {
return NewAppError("FileInfo.IsValid", "model.file_info.is_valid.user_id.app_error", nil, "id="+fi.Id, http.StatusBadRequest)
}
if fi.PostId != "" && !IsValidId(fi.PostId) {
return NewAppError("FileInfo.IsValid", "model.file_info.is_valid.post_id.app_error", nil, "id="+fi.Id, http.StatusBadRequest)
}
if fi.CreateAt == 0 {
return NewAppError("FileInfo.IsValid", "model.file_info.is_valid.create_at.app_error", nil, "id="+fi.Id, http.StatusBadRequest)
}
if fi.UpdateAt == 0 {
return NewAppError("FileInfo.IsValid", "model.file_info.is_valid.update_at.app_error", nil, "id="+fi.Id, http.StatusBadRequest)
}
if fi.Path == "" {
return NewAppError("FileInfo.IsValid", "model.file_info.is_valid.path.app_error", nil, "id="+fi.Id, http.StatusBadRequest)
}
return nil
}
func (fi *FileInfo) IsImage() bool {
return strings.HasPrefix(fi.MimeType, "image")
}
func NewInfo(name string) *FileInfo {
info := &FileInfo{
Name: name,
}
extension := strings.ToLower(filepath.Ext(name))
info.MimeType = mime.TypeByExtension(extension)
if extension != "" && extension[0] == '.' {
// The client expects a file extension without the leading period
info.Extension = extension[1:]
} else {
info.Extension = extension
}
return info
}
func GetInfoForBytes(name string, data io.ReadSeeker, size int) (*FileInfo, *AppError) {
info := &FileInfo{
Name: name,
Size: int64(size),
}
var err *AppError
extension := strings.ToLower(filepath.Ext(name))
info.MimeType = mime.TypeByExtension(extension)
if extension != "" && extension[0] == '.' {
// The client expects a file extension without the leading period
info.Extension = extension[1:]
} else {
info.Extension = extension
}
if info.IsImage() {
// Only set the width and height if it's actually an image that we can understand
if config, _, err := image.DecodeConfig(data); err == nil {
info.Width = config.Width
info.Height = config.Height
if info.MimeType == "image/gif" {
// Just show the gif itself instead of a preview image for animated gifs
data.Seek(0, io.SeekStart)
gifConfig, err := gif.DecodeAll(data)
if err != nil {
// Still return the rest of the info even though it doesn't appear to be an actual gif
info.HasPreviewImage = true
return info, NewAppError("GetInfoForBytes", "model.file_info.get.gif.app_error", nil, err.Error(), http.StatusBadRequest)
}
info.HasPreviewImage = len(gifConfig.Image) == 1
} else {
info.HasPreviewImage = true
}
}
}
return info, err
}
func GetEtagForFileInfos(infos []*FileInfo) string {
if len(infos) == 0 {
return Etag()
}
var maxUpdateAt int64
for _, info := range infos {
if info.UpdateAt > maxUpdateAt {
maxUpdateAt = info.UpdateAt
}
}
return Etag(infos[0].PostId, maxUpdateAt)
}
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