Golang User.Groups Examples

Example #1

File: file.go Project: waterytowers/global-hack-day-3

// Checks if the specified user has permission to perform
// certain operation on a file. Perm contains one or more
// of go9p.DMREAD, go9p.DMWRITE, and go9p.DMEXEC.
func (f *File) CheckPerm(user go9p.User, perm uint32) bool {
	if user == nil {
		return false
	}

	perm &= 7

	/* other permissions */
	fperm := f.Mode & 7
	if (fperm & perm) == perm {
		return true
	}

	/* user permissions */
	if f.Uid == user.Name() || f.Uidnum == uint32(user.Id()) {
		fperm |= (f.Mode >> 6) & 7
	}

	if (fperm & perm) == perm {
		return true
	}

	/* group permissions */
	groups := user.Groups()
	if groups != nil && len(groups) > 0 {
		for i := 0; i < len(groups); i++ {
			if f.Gid == groups[i].Name() || f.Gidnum == uint32(groups[i].Id()) {
				fperm |= (f.Mode >> 3) & 7
				break
			}
		}
	}

	if (fperm & perm) == perm {
		return true
	}

	return false
}