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14: class Auth {
    ...
46:   function start() {
47:     $cl = $this->cancel_login;
48:     global $sess, $$cl;
    ...

63:     # Check current auth state. Should be one of
64:     #  1) Not logged in (no valid auth info or auth expired)
65:     #  2) Logged in (valid auth info)
66:     #  3) Login in progress (if $$cl, revert to state 1)
67:     if ($this->is_authenticated()) {
68:       $uid = $this->auth["uid"];
69:       switch ($uid) {
70:         case "form":
71:           # Login in progress
72:           if ($$cl) {
73:             # If $$cl is set, delete all auth info
74:             # and set state to "Not logged in", so eventually
75:             # default or automatic authentication may take place
76:             $this->unauth();
77:             $state = 1;
78:           } else {
79:             # Set state to "Login in progress"
80:             $state = 3;
81:           }
82:           break;
83:         default:
84:           # User is authenticated and auth not expired
85:           $state = 2;
86:           break;
87:       }
88:     } else {
89:       # User is not (yet) authenticated
90:       $this->unauth();
91:       $state = 1;
92:     }
    ... 
305: }