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|
package name
import (
"fmt"
"strings"
)
const lockSuffix = ".lock"
func nameDisposition(ch byte) byte {
switch {
case ch == '/':
return 1
case ch == '.':
return 2
case ch == '{':
return 3
case ch == '*':
return 5
case ch < 0x20 || ch == 0x7f:
return 4
case ch == ':' || ch == '?' || ch == '[' || ch == '\\' || ch == '^' || ch == '~' || ch == ' ' || ch == '\t':
return 4
default:
return 0
}
}
func checkRefnameComponent(name string, flags *int, sanitized *strings.Builder) (int, error) {
var last byte
var componentStart int
if sanitized != nil {
componentStart = sanitized.Len()
}
for i := range len(name) {
ch := name[i]
disp := nameDisposition(ch)
if sanitized != nil && disp != 1 {
sanitized.WriteByte(ch)
}
switch disp {
case 1:
goto out
case 2:
if last == '.' {
if sanitized != nil {
truncateBuilder(sanitized, sanitized.Len()-1)
} else {
return 0, fmt.Errorf("%w: name contains '..'", ErrInvalidName)
}
}
case 3:
if last == '@' {
if sanitized != nil {
overwriteBuilderAt(sanitized, sanitized.Len()-1)
} else {
return 0, fmt.Errorf("%w: name contains '@{'", ErrInvalidName)
}
}
case 4:
if sanitized != nil {
overwriteBuilderAt(sanitized, sanitized.Len()-1)
} else {
return 0, fmt.Errorf("%w: name contains a forbidden character", ErrInvalidName)
}
case 5:
if *flags&nameRefspecPattern == 0 {
if sanitized != nil {
overwriteBuilderAt(sanitized, sanitized.Len()-1)
} else {
return 0, fmt.Errorf("%w: name contains '*'", ErrInvalidName)
}
}
*flags &^= nameRefspecPattern
}
last = ch
}
out:
componentLen := strings.IndexByte(name, '/')
if componentLen < 0 {
componentLen = len(name)
}
if componentLen == 0 {
return 0, nil
}
if name[0] == '.' {
if sanitized != nil {
overwriteBuilderAt(sanitized, componentStart)
} else {
return 0, fmt.Errorf("%w: component starts with '.'", ErrInvalidName)
}
}
if componentLen >= len(lockSuffix) && name[componentLen-len(lockSuffix):componentLen] == lockSuffix {
if sanitized == nil {
return 0, fmt.Errorf("%w: component ends with .lock", ErrInvalidName)
}
for strings.HasSuffix(sanitized.String(), lockSuffix) {
truncateBuilder(sanitized, sanitized.Len()-len(lockSuffix))
}
}
return componentLen, nil
}
|
