@startuml 'round the notes to look like activity boxes skinparam roundcorner 10 autonumber actor Individual as individual <<registered>> boundary "Sign In Page" as signInPage <<ui>> control "Auth Service" as auth entity User as user database Repository as repo individual -> signInPage ++ : enter username or email individual -> signInPage : enter password individual -> signInPage : sign in signInPage -> auth ++ : auth user auth -> repo ++ : get user by username or email return user rnote over auth: granted = user exists\nand credentials\nare correct return granted rnote over signInPage: page = granted ?\nlogin page :\nerror page return page @enduml Submit amiga aws-orange black-knight bluegray blueprint cerulean-outline cerulean crt-amber crt-green cyborg-outline cyborg hacker lightgray mars materia-outline materia metal mimeograph minty plain reddress-darkblue reddress-darkgreen reddress-darkorange reddress-darkred reddress-lightblue reddress-lightgreen reddress-lightorange reddress-lightred sandstone silver sketchy-outline sketchy spacelab spacelab-white superhero-outline superhero toy united vibrant       🎉 Discover the future PlantUML Web Editor! 🚀  PNG  SVG  ASCII Art