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mediaapi/fileutils: Change path schema to put file in subdir of hash

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This commit is contained in:
Robert Swain 2017-05-31 07:06:42 +02:00
parent 8c6f30eadc
commit 0ca2931b62
1 changed files with 10 additions and 25 deletions
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35
src/github.com/matrix-org/dendrite/mediaapi/fileutils/fileutils.go
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@ -31,37 +31,22 @@ import (
)
// GetPathFromBase64Hash evaluates the path to a media file from its Base64Hash
// If the Base64Hash is long enough, we split it into pieces, creating up to 2 subdirectories
// for more manageable browsing and use the remainder as the file name.
// For example, if Base64Hash is 'qwerty', the path will be 'q/w/erty'.
// 3 subdirectories are created for more manageable browsing and use the remainder as the file name.
// For example, if Base64Hash is 'qwerty', the path will be 'q/w/erty/file'.
func GetPathFromBase64Hash(base64Hash types.Base64Hash, absBasePath types.Path) (string, error) {
var subPath, fileName string
hashLen := len(base64Hash)
switch {
case hashLen < 1:
return "", fmt.Errorf("Invalid filePath (Base64Hash too short): %q", base64Hash)
case hashLen > 255:
if len(base64Hash) < 3 {
return "", fmt.Errorf("Invalid filePath (Base64Hash too short - min 3 characters): %q", base64Hash)
}
if len(base64Hash) > 255 {
return "", fmt.Errorf("Invalid filePath (Base64Hash too long - max 255 characters): %q", base64Hash)
case hashLen < 2:
subPath = ""
fileName = string(base64Hash)
case hashLen < 3:
subPath = string(base64Hash[0:1])
fileName = string(base64Hash[1:])
default:
subPath = path.Join(
string(base64Hash[0:1]),
string(base64Hash[1:2]),
)
fileName = string(base64Hash[2:])
}
filePath, err := filepath.Abs(path.Join(
string(absBasePath),
subPath,
fileName,
string(base64Hash[0:1]),
string(base64Hash[1:2]),
string(base64Hash[2:]),
"file",
))
if err != nil {
return "", fmt.Errorf("Unable to construct filePath: %q", err)