feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/concerns/has_token.go

@@ -0,0 +1,41 @@
+// Package concerns provides functionality.
+package concerns
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/base64"
+)
+
+// HasToken provides functionality.
+type HasToken struct {
+	Token string `json:"-" gorm:"unique_index"`
+}
+
+// SetToken provides functionality.
+func (m *HasToken) SetToken() {
+	tk := RandomToken(32)
+	m.Token = base64.RawURLEncoding.EncodeToString(tk)
+	if m.Token == "" {
+		panic("RandomToken failed: token not set")
+	}
+	if len(m.Token) < 32 {
+		panic("RandomToken failed: token too short")
+	}
+}
+
+// RandomToken provides functionality.
+func RandomToken(tokenLen int) []byte {
+	b := make([]byte, tokenLen)
+	n, err := rand.Read(b)
+	if err != nil {
+		panic(err)
+	}
+	if n != tokenLen {
+		panic("RandomToken failed: bad len")
+	}
+	if bytes.Equal(b, make([]byte, tokenLen)) {
+		panic("RandomToken failed: generated empty token")
+	}
+	return b
+}