Added ServerVerification Functions, Minor Cleanup

api/misc.go

@@ -1,7 +1,10 @@
 package api
 
 import (
+	"fmt"
 	"math/rand"
+	"strconv"
+	"strings"
 )
 
 const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
@@ -13,3 +16,28 @@ func randStringBytesRmndr(length int) string {
 	}
 	return string(b)
 }
+
+func checkAuthTokenFormat(authToken string) error {
+	splitAuthToken := strings.Split(authToken, "|")
+	if len(splitAuthToken) != 4 {
+		return fmt.Errorf("Auth Token Has Wrong amount of Fields")
+	}
+
+	if splitAuthToken[0] != splitAuthToken[3] {
+		return fmt.Errorf("Auth Token Version Fields Don't match")
+	}
+
+	if !strings.HasPrefix(splitAuthToken[0], "gpgauth") {
+		return fmt.Errorf("Auth Token Version does not start with 'gpgauth'")
+	}
+
+	length, err := strconv.Atoi(splitAuthToken[1])
+	if err != nil {
+		return fmt.Errorf("Cannot Convert Auth Token Length Field to int: %w", err)
+	}
+
+	if len(splitAuthToken[2]) != length {
+		return fmt.Errorf("Auth Token Data Length does not Match Length Field")
+	}
+	return nil
+}