mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-01 15:00:00 +00:00
106 lines
3 KiB
Go
106 lines
3 KiB
Go
/*
|
|
GoToSocial
|
|
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package media
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/h2non/filetype"
|
|
)
|
|
|
|
// parseContentType parses the MIME content type from a file, returning it as a string in the form (eg., "image/jpeg").
|
|
// Returns an error if the content type is not something we can process.
|
|
//
|
|
// Fileheader should be no longer than 262 bytes; anything more than this is inefficient.
|
|
func parseContentType(fileHeader []byte) (string, error) {
|
|
if fhLength := len(fileHeader); fhLength > maxFileHeaderBytes {
|
|
return "", fmt.Errorf("parseContentType requires %d bytes max, we got %d", maxFileHeaderBytes, fhLength)
|
|
}
|
|
|
|
kind, err := filetype.Match(fileHeader)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
if kind == filetype.Unknown {
|
|
return "", errors.New("filetype unknown")
|
|
}
|
|
|
|
return kind.MIME.Value, nil
|
|
}
|
|
|
|
// supportedImage checks mime type of an image against a slice of accepted types,
|
|
// and returns True if the mime type is accepted.
|
|
func supportedImage(mimeType string) bool {
|
|
acceptedImageTypes := []string{
|
|
mimeImageJpeg,
|
|
mimeImageGif,
|
|
mimeImagePng,
|
|
}
|
|
for _, accepted := range acceptedImageTypes {
|
|
if mimeType == accepted {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// supportedEmoji checks that the content type is image/png or image/gif -- the only types supported for emoji.
|
|
func supportedEmoji(mimeType string) bool {
|
|
acceptedEmojiTypes := []string{
|
|
mimeImageGif,
|
|
mimeImagePng,
|
|
}
|
|
for _, accepted := range acceptedEmojiTypes {
|
|
if mimeType == accepted {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// ParseMediaType converts s to a recognized MediaType, or returns an error if unrecognized
|
|
func ParseMediaType(s string) (Type, error) {
|
|
switch s {
|
|
case string(TypeAttachment):
|
|
return TypeAttachment, nil
|
|
case string(TypeHeader):
|
|
return TypeHeader, nil
|
|
case string(TypeAvatar):
|
|
return TypeAvatar, nil
|
|
case string(TypeEmoji):
|
|
return TypeEmoji, nil
|
|
}
|
|
return "", fmt.Errorf("%s not a recognized MediaType", s)
|
|
}
|
|
|
|
// ParseMediaSize converts s to a recognized MediaSize, or returns an error if unrecognized
|
|
func ParseMediaSize(s string) (Size, error) {
|
|
switch s {
|
|
case string(SizeSmall):
|
|
return SizeSmall, nil
|
|
case string(SizeOriginal):
|
|
return SizeOriginal, nil
|
|
case string(SizeStatic):
|
|
return SizeStatic, nil
|
|
}
|
|
return "", fmt.Errorf("%s not a recognized MediaSize", s)
|
|
}
|