Implmented the EAN generation

ref #77

src/errors/RunnerCardErrors.ts

@@ -25,7 +25,7 @@ export class RunnerCardIdsNotMatchingError extends NotAcceptableError {
 }
 
 /**
- * Error to throw when a station still has scans associated.
+ * Error to throw when a card still has scans associated.
  */
 export class RunnerCardHasScansError extends NotAcceptableError {
 	@IsString()
@@ -34,3 +34,15 @@ export class RunnerCardHasScansError extends NotAcceptableError {
 	@IsString()
 	message = "This card still has scans associated with it. \n If you want to delete this card with all it's scans add `?force` to your query. \n Otherwise please consider just diableing it."
 }
+
+/**
+ * Error to throw when a card's id is too big to generate a ean-13 barcode for it.
+ * This error should never reach a enduser.
+ */
+export class RunnerCardIdOutOfRangeError extends Error {
+	@IsString()
+	name = "RunnerCardIdOutOfRangeError"
+
+	@IsString()
+	message = "The card's id is too big to fit into a ean-13 barcode. \n This has a very low probability of happening but means that you might want to switch your barcode format for something that can accept numbers over 9999999999."
+}