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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package model
import (
"bytes"
"encoding/json"
"image"
"image/gif"
"io"
"mime"
"path/filepath"
"strings"
)
type FileInfo struct {
Id string `json:"id"`
CreatorId string `json:"user_id"`
PostId string `json:"post_id,omitempty"`
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"`
}
func (info *FileInfo) ToJson() string {
b, err := json.Marshal(info)
if err != nil {
return ""
} else {
return string(b)
}
}
func FileInfoFromJson(data io.Reader) *FileInfo {
decoder := json.NewDecoder(data)
var info FileInfo
if err := decoder.Decode(&info); err != nil {
return nil
} else {
return &info
}
}
func FileInfosToJson(infos []*FileInfo) string {
b, err := json.Marshal(infos)
if err != nil {
return ""
} else {
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
} else {
return infos
}
}
func (o *FileInfo) PreSave() {
if o.Id == "" {
o.Id = NewId()
}
if o.CreateAt == 0 {
o.CreateAt = GetMillis()
o.UpdateAt = o.CreateAt
}
}
func (o *FileInfo) IsValid() *AppError {
if len(o.Id) != 26 {
return NewLocAppError("FileInfo.IsValid", "model.file_info.is_valid.id.app_error", nil, "")
}
if len(o.CreatorId) != 26 {
return NewLocAppError("FileInfo.IsValid", "model.file_info.is_valid.user_id.app_error", nil, "id="+o.Id)
}
if len(o.PostId) != 0 && len(o.PostId) != 26 {
return NewLocAppError("FileInfo.IsValid", "model.file_info.is_valid.post_id.app_error", nil, "id="+o.Id)
}
if o.CreateAt == 0 {
return NewLocAppError("FileInfo.IsValid", "model.file_info.is_valid.create_at.app_error", nil, "id="+o.Id)
}
if o.UpdateAt == 0 {
return NewLocAppError("FileInfo.IsValid", "model.file_info.is_valid.update_at.app_error", nil, "id="+o.Id)
}
if o.Path == "" {
return NewLocAppError("FileInfo.IsValid", "model.file_info.is_valid.path.app_error", nil, "id="+o.Id)
}
return nil
}
func (o *FileInfo) IsImage() bool {
return strings.HasPrefix(o.MimeType, "image")
}
func GetInfoForBytes(name string, data []byte) (*FileInfo, *AppError) {
info := &FileInfo{
Name: name,
Size: int64(len(data)),
}
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(bytes.NewReader(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
if gifConfig, err := gif.DecodeAll(bytes.NewReader(data)); err != nil {
// Still return the rest of the info even though it doesn't appear to be an actual gif
info.HasPreviewImage = true
err = NewLocAppError("GetInfoForBytes", "model.file_info.get.gif.app_error", nil, "name="+name)
} else {
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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