implemented event and req

pkg/encoders/reason/reason.go

@@ -0,0 +1,52 @@
+package reason
+
+import (
+	"bytes"
+	"fmt"
+
+	"lol.mleku.dev/log"
+)
+
+// R is the machine-readable prefix before the colon in an OK or CLOSED envelope message.
+// Below are the most common kinds that are mentioned in NIP-01.
+type R []byte
+
+var (
+	AuthRequired = R("auth-required")
+	PoW          = R("pow")
+	Duplicate    = R("duplicate")
+	Blocked      = R("blocked")
+	RateLimited  = R("rate-limited")
+	Invalid      = R("invalid")
+	Error        = R("error")
+	Unsupported  = R("unsupported")
+	Restricted   = R("restricted")
+)
+
+// S returns the R as a string
+func (r R) S() string { return string(r) }
+
+// B returns the R as a byte slice.
+func (r R) B() []byte { return r }
+
+// IsPrefix returns whether a text contains the same R prefix.
+func (r R) IsPrefix(reason []byte) bool {
+	return bytes.HasPrefix(
+		reason, r.B(),
+	)
+}
+
+// F allows creation of a full R text with a printf style format.
+func (r R) F(format string, params ...any) (o []byte) {
+	log.D.F(format, params...)
+	return Msg(r, format, params...)
+}
+
+// Msg constructs a properly formatted message with a machine-readable prefix
+// for OK and CLOSED envelopes.
+func Msg(prefix R, format string, params ...any) (o []byte) {
+	if len(prefix) < 1 {
+		prefix = Error
+	}
+	return []byte(fmt.Sprintf(prefix.S()+": "+format, params...))
+}