+ # Implicit account creation.
+ my $userinfo=IkiWiki::userinfo_retrieve();
+ if (! exists $userinfo->{$email} || ! ref $userinfo->{$email}) {
+ IkiWiki::userinfo_setall($email, {
+ 'email' => $email,
+ 'regdate' => time,
+ });
+ }
+
+ my $token=gentoken($email, $session);
+ my $template=template("emailauth.tmpl");
+ $template->param(
+ wikiname => $config{wikiname},
+ # Intentionally using short field names to keep link short.
+ authurl => IkiWiki::cgiurl_abs_samescheme(
+ 'e' => $email,
+ 'v' => $token,
+ ),
+ );
+
+ eval q{use Mail::Sendmail};
+ error($@) if $@;
+ my $shorturl=$config{url};
+ $shorturl=~s/^https?:\/\///i;
+ my $emailauth_sender=$config{emailauth_sender};
+ $emailauth_sender=$config{adminemail} unless defined $emailauth_sender;
+ sendmail(
+ To => $email,
+ From => "$config{wikiname} admin <".
+ (defined $emailauth_sender ? $emailauth_sender : "")
+ .">",
+ Subject => "$config{wikiname} login | $shorturl",
+ Message => $template->output,
+ ) or error(sprintf(gettext("Failed to send mail: %s"), $Mail::Sendmail::error));
+
+ $infodisplayer->(gettext("You have been sent an email, with a link you can open to complete the login process."));
+}
+
+# Finish login process.
+sub cgi ($$) {
+ my $cgi=shift;
+
+ my $email=$cgi->param('e');
+ my $v=$cgi->param('v');
+ if (defined $email && defined $v && length $email && length $v) {
+ my $token=gettoken($email);
+ if ($token eq $v) {
+ cleartoken($email);
+ my $session=getsession($email);
+ IkiWiki::cgi_postsignin($cgi, $session);
+ }
+ elsif (length $token ne length $cgi->param('v')) {
+ error(gettext("Wrong login token length. Please check that you pasted in the complete login link from the email!"));
+ }
+ else {
+ loginfailure();
+ }
+ }
+}
+
+sub formbuilder_setup (@) {
+ my %params=@_;
+ my $form=$params{form};
+ my $session=$params{session};
+
+ if ($form->title eq "preferences" &&
+ IkiWiki::emailuser($session->param("name"))) {
+ $form->field(name => "email", disabled => 1);
+ }
+}
+
+# Generates the token that will be used in the authurl to log the user in.
+# This needs to be hard to guess, and relatively short. Generating a cgi
+# session id will make it as hard to guess as any cgi session.
+#
+# Store token in userinfo; this allows the user to log in
+# using a different browser session, if it takes a while for the
+# email to get to them.
+#
+# The postsignin value from the session is also stored in the userinfo
+# to allow resuming in a different browser session.
+sub gentoken ($$) {
+ my $email=shift;
+ my $session=shift;
+ eval q{use CGI::Session};
+ error($@) if $@;
+ my $token = CGI::Session->new("driver:DB_File", undef, {FileName => "/dev/null"})->id;
+ IkiWiki::userinfo_set($email, "emailauthexpire", time+(60*60*24));
+ IkiWiki::userinfo_set($email, "emailauth", $token);
+ IkiWiki::userinfo_set($email, "emailauthpostsignin", defined $session->param("postsignin") ? $session->param("postsignin") : "");
+ return $token;
+}
+
+# Gets the token, checking for expiry.
+sub gettoken ($) {
+ my $email=shift;
+ my $val=IkiWiki::userinfo_get($email, "emailauth");
+ my $expire=IkiWiki::userinfo_get($email, "emailauthexpire");
+ if (! length $val || time > $expire) {
+ loginfailure();
+ }
+ return $val;
+}
+
+# Generate a session to use after successful login.
+sub getsession ($) {
+ my $email=shift;
+
+ IkiWiki::lockwiki();
+ IkiWiki::loadindex();
+ my $session=IkiWiki::cgi_getsession();
+
+ my $postsignin=IkiWiki::userinfo_get($email, "emailauthpostsignin");
+ IkiWiki::userinfo_set($email, "emailauthpostsignin", "");
+ if (defined $postsignin && length $postsignin) {
+ $session->param(postsignin => $postsignin);
+ }
+
+ $session->param(name => $email);
+ my $nickname=$email;
+ $nickname=~s/@.*//;
+ $session->param(nickname => Encode::decode_utf8($nickname));
+
+ IkiWiki::cgi_savesession($session);
+
+ return $session;
+}
+
+sub cleartoken ($) {
+ my $email=shift;
+ IkiWiki::userinfo_set($email, "emailauthexpire", 0);
+ IkiWiki::userinfo_set($email, "emailauth", "");