From 6309469e933a31a300fbf16d8e77f48dcee402d3 Mon Sep 17 00:00:00 2001 From: Ophestra Date: Sat, 12 Apr 2025 13:56:41 +0900 Subject: app/instance: wrap internal implementation This reduces the scope of the fst package, which was growing questionably large. Signed-off-by: Ophestra --- internal/app/id.go | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 internal/app/id.go (limited to 'internal/app/id.go') diff --git a/internal/app/id.go b/internal/app/id.go new file mode 100644 index 00000000..e674c7dd --- /dev/null +++ b/internal/app/id.go @@ -0,0 +1,48 @@ +package app + +import ( + "crypto/rand" + "encoding/hex" + "errors" + "fmt" +) + +type ID [16]byte + +var ( + ErrInvalidLength = errors.New("string representation must have a length of 32") +) + +func (a *ID) String() string { + return hex.EncodeToString(a[:]) +} + +func NewAppID(id *ID) error { + _, err := rand.Read(id[:]) + return err +} + +func ParseAppID(id *ID, s string) error { + if len(s) != 32 { + return ErrInvalidLength + } + + for i, b := range s { + if b < '0' || b > 'f' { + return fmt.Errorf("invalid char %q at byte %d", b, i) + } + + v := uint8(b) + if v > '9' { + v = 10 + v - 'a' + } else { + v -= '0' + } + if i%2 == 0 { + v <<= 4 + } + id[i/2] += v + } + + return nil +} -- cgit v1.3.1