Add backend foundation and config-driven workbench

backend/internal/platform/security/token.go

@@ -0,0 +1,47 @@
+package security
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+)
+
+func GenerateToken(byteLength int) (string, error) {
+	raw := make([]byte, byteLength)
+	if _, err := rand.Read(raw); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(raw), nil
+}
+
+func GenerateNumericCode(length int) (string, error) {
+	if length <= 0 {
+		length = 6
+	}
+
+	const digits = "0123456789"
+	raw := make([]byte, length)
+	if _, err := rand.Read(raw); err != nil {
+		return "", err
+	}
+
+	code := make([]byte, length)
+	for i := range raw {
+		code[i] = digits[int(raw[i])%len(digits)]
+	}
+	return string(code), nil
+}
+
+func HashText(value string) string {
+	sum := sha256.Sum256([]byte(value))
+	return hex.EncodeToString(sum[:])
+}
+
+func GeneratePublicID(prefix string) (string, error) {
+	raw := make([]byte, 8)
+	if _, err := rand.Read(raw); err != nil {
+		return "", err
+	}
+	return prefix + "_" + hex.EncodeToString(raw), nil
+}