AttendeeRegistration.msc

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msc {
	# Options
	hscale="1.5", wordwraparcs=1;
	# Define the actors
	User, Email, Server, Database;
	# Title note
	User note Database [
	label="Describes the process of registering a new attendee",
	textbgcolor="aqua"];

	# Define the messages
	User->Server [label="New Attendee w/ email"];
	Server=>Server [label="Verify email safety"];
	--- [label="If email unsafe, return bad email response"];
	Server->User [label="Bad Email",
			linecolor="red"];
	--- [label="Otherwise issue a new challenge"];
	Server->Database [label="Create new challenge pair"];
	Server->User [label="Send challenge id"];
	Server->Email [label="Send challenge code", arcskip=1];
	|||;
	Email->User [label="Share challenge code", arcskip=1];
	|||;
	User->Server [label="Attendee info w/ code & id"];
	Server->Database [label="Verify challenge code & id"];
	Server=>Server [label="Validate data"];
	--- [label="If code expired or invalid, return bad auth response"];
	Server->User [label="Bad Auth",
			linecolor="red"];
	--- [label="Otherwise, create the new attendee"];
	Server->Database [label="Create attendee"];
	Server->User [label="New attendee ID"];
}