568b4ebb88
Migrations: - 016, 017, 019: Replace gen_random_uuid() with uuid_generate_v7() - All UUID tables now use custom uuid_generate_v7() function Backend: - Create internal/utils/uuid/uuid.go with V7() function (RFC 9562) - Update storage_handler.go to use internal uuid.V7() - Remove dependency on google/uuid for file naming All new UUIDs in the system are now UUID v7 (time-ordered)
64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
package uuid
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import (
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"time"
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)
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// V7 generates a UUID v7 (time-ordered) following RFC 9562
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// Format: tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx
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// Where: t = timestamp (48 bits), 7 = version, y = variant, x = random
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func V7() string {
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// Get current timestamp in milliseconds
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timestamp := time.Now().UnixMilli()
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// Generate 10 random bytes
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randomBytes := make([]byte, 10)
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rand.Read(randomBytes)
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// Build UUID bytes (16 total)
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var bytes [16]byte
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// First 6 bytes: timestamp (48 bits, big-endian)
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binary.BigEndian.PutUint32(bytes[0:4], uint32(timestamp>>16))
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binary.BigEndian.PutUint16(bytes[4:6], uint16(timestamp))
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// Next 2 bytes: version (4 bits = 7) + random (12 bits)
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bytes[6] = 0x70 | (randomBytes[0] & 0x0F) // version 7
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bytes[7] = randomBytes[1]
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// Last 8 bytes: variant (2 bits = 10) + random (62 bits)
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bytes[8] = 0x80 | (randomBytes[2] & 0x3F) // variant RFC 4122
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copy(bytes[9:16], randomBytes[3:10])
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// Format as UUID string
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return fmt.Sprintf("%08x-%04x-%04x-%04x-%012x",
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binary.BigEndian.Uint32(bytes[0:4]),
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binary.BigEndian.Uint16(bytes[4:6]),
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binary.BigEndian.Uint16(bytes[6:8]),
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binary.BigEndian.Uint16(bytes[8:10]),
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bytes[10:16],
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)
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}
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// IsValid checks if a string is a valid UUID (any version)
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func IsValid(s string) bool {
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// Basic UUID format check: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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if len(s) != 36 {
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return false
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}
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for i, c := range s {
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if i == 8 || i == 13 || i == 18 || i == 23 {
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if c != '-' {
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return false
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}
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} else {
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if !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F')) {
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return false
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}
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}
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}
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return true
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}
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