Login, JWT and auth overstructure

* Signup -> Login -> JWT-Doot flow now works for users
* Administrators cannot currently sign up for obvious reasons
* Segmented the main.go methods into a core controller package

util/util.go

@@ -1,6 +1,10 @@
 package util
 
-import "crypto/rand"
+import (
+	"crypto/rand"
+
+	"github.com/google/uuid"
+)
 
 func GenerateHmac() []byte {
 	b := make([]byte, 64)
@@ -10,3 +14,12 @@ func GenerateHmac() []byte {
 
 	return b
 }
+
+type PrincipalInfo struct {
+	Uid  uuid.UUID
+	Role string
+}
+
+type FailMsg struct {
+	Reason string `json:"reason"`
+}