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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/gif"
"io"
"mime"
"path/filepath"
)
type FileInfo struct {
Filename string `json:"filename"`
Size int `json:"size"`
Extension string `json:"extension"`
MimeType string `json:"mime_type"`
HasPreviewImage bool `json:"has_preview_image"`
}
func GetInfoForBytes(filename string, data []byte) (*FileInfo, *AppError) {
size := len(data)
var mimeType string
extension := filepath.Ext(filename)
isImage := IsFileExtImage(extension)
if isImage {
mimeType = GetImageMimeType(extension)
} else {
mimeType = mime.TypeByExtension(extension)
}
hasPreviewImage := isImage
if mimeType == "image/gif" {
// just show the gif itself instead of a preview image for animated gifs
if gifImage, err := gif.DecodeAll(bytes.NewReader(data)); err != nil {
return nil, NewAppError("GetInfoForBytes", "Could not decode gif.", "filename="+filename)
} else {
hasPreviewImage = len(gifImage.Image) == 1
}
}
return &FileInfo{
Filename: filename,
Size: size,
Extension: extension[1:],
MimeType: mimeType,
HasPreviewImage: hasPreviewImage,
}, nil
}
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
}
}
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