AttendeeInformationUpdate.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 updating an existing attendee's information",
		textbgcolor="aqua"];
	# Define the messages
	User->Server [label="View attendee information"];
	Server->Database [label="Get attendee information"];
	Server->User [label="Share attendee information"];
	...;
	User->Server [label="Request to edit attendee information"];
	Server=>Server [label="Determine appropriate email to challenge"];
	Server=>Server [label="Verify email safety"];
	--- [label="If email unsafe, return unavailable response"];
	Server->User [label="Unavailable",
			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="Updated 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, update the attendee"];
	Server->Database [label="Update attendee info"];
	Server->User [label="Return updated attendee info"];
}