X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/bce9a327c305455c4721d9f6b087a9298f7e460f..3092645a52f3e18406847f12a6c0ac060dd73a25:/IkiWiki/CGI.pm?ds=inline

diff --git a/IkiWiki/CGI.pm b/IkiWiki/CGI.pm
index 89047a952..155010a97 100644
--- a/IkiWiki/CGI.pm
+++ b/IkiWiki/CGI.pm
@@ -2,207 +2,208 @@
 
 use warnings;
 use strict;
+use IkiWiki;
+use IkiWiki::UserInfo;
+use open qw{:utf8 :std};
+use Encode;
 
 package IkiWiki;
 
-sub page_locked ($$;$) { #{{{
+sub printheader ($) { #{{{
+	my $session=shift;
+	
+	if ($config{sslcookie}) {
+		print $session->header(-charset => 'utf-8',
+			-cookie => $session->cookie(-secure => 1));
+	} else {
+		print $session->header(-charset => 'utf-8');
+	}
+
+} #}}}
+	
+sub showform ($$$$) { #{{{
+	my $form=shift;
+	my $buttons=shift;
+	my $session=shift;
+	my $cgi=shift;
+
+	if (exists $hooks{formbuilder}) {
+		run_hooks(formbuilder => sub {
+			shift->(form => $form, cgi => $cgi, session => $session,
+				buttons => $buttons);
+		});
+	}
+	else {
+		printheader($session);
+		print misctemplate($form->title, $form->render(submit => $buttons));
+	}
+}
+
+sub redirect ($$) { #{{{
+	my $q=shift;
+	my $url=shift;
+	if (! $config{w3mmode}) {
+		print $q->redirect($url);
+	}
+	else {
+		print "Content-type: text/plain\n";
+		print "W3m-control: GOTO $url\n\n";
+	}
+} #}}}
+
+sub check_canedit ($$$;$) { #{{{
 	my $page=shift;
+	my $q=shift;
 	my $session=shift;
 	my $nonfatal=shift;
 	
-	my $user=$session->param("name");
-	return if length $user && is_admin($user);
-
-	foreach my $admin (@{$config{adminuser}}) {
-		my $locked_pages=userinfo_get($admin, "locked_pages");
-		if (globlist_match($page, userinfo_get($admin, "locked_pages"))) {
-			return 1 if $nonfatal;
-			error(htmllink("", $page, 1)." is locked by ".
-			      htmllink("", $admin, 1)." and cannot be edited.");
+	my $canedit;
+	run_hooks(canedit => sub {
+		return if defined $canedit;
+		my $ret=shift->($page, $q, $session);
+		if (defined $ret && $ret eq "") {
+			$canedit=1;
 		}
-	}
+		elsif (defined $ret) {
+			$canedit=0;
+			error($ret) unless $nonfatal;
+		}
+	});
+	return $canedit;
+} #}}}
 
-	return 0;
+sub decode_form_utf8 ($) { #{{{
+	my $form = shift;
+	foreach my $f ($form->field) {
+		next if Encode::is_utf8(scalar $form->field($f));
+		$form->field(name  => $f,
+			     value => decode_utf8($form->field($f)),
+			     force => 1,
+			    );
+	}
 } #}}}
 
 sub cgi_recentchanges ($) { #{{{
 	my $q=shift;
 	
-	unlockwiki();
+	# Optimisation: building recentchanges means calculating lots of
+	# links. Memoizing htmllink speeds it up a lot (can't be memoized
+	# during page builds as the return values may change, but they
+	# won't here.)
+	eval q{use Memoize};
+	error($@) if $@;
+	memoize("htmllink");
 
-	my $template=HTML::Template->new(
-		filename => "$config{templatedir}/recentchanges.tmpl"
-	);
+	eval q{use Time::Duration};
+	error($@) if $@;
+
+	my $changelog=[rcs_recentchanges(100)];
+	foreach my $change (@$changelog) {
+		$change->{when} = concise(ago($change->{when}));
+
+		$change->{user} = userlink($change->{user});
+
+		my $is_excess = exists $change->{pages}[10]; # limit pages to first 10
+		delete @{$change->{pages}}[10 .. @{$change->{pages}}] if $is_excess;
+		$change->{pages} = [
+			map {
+				$_->{link} = htmllink("", "", $_->{page},
+					noimageinline => 1,
+					linktext => pagetitle($_->{page}));
+				$_;
+			} @{$change->{pages}}
+		];
+		push @{$change->{pages}}, { link => '...' } if $is_excess;
+	}
+
+	my $template=template("recentchanges.tmpl"); 
 	$template->param(
 		title => "RecentChanges",
 		indexlink => indexlink(),
 		wikiname => $config{wikiname},
-		changelog => [rcs_recentchanges(100)],
+		changelog => $changelog,
+		baseurl => baseurl(),
 	);
-	print $q->header, $template->output;
+	run_hooks(pagetemplate => sub {
+		shift->(page => "", destpage => "", template => $template);
+	});
+	print $q->header(-charset => 'utf-8'), $template->output;
 } #}}}
 
+# Check if the user is signed in. If not, redirect to the signin form and
+# save their place to return to later.
+sub needsignin ($$) { #{{{
+	my $q=shift;
+	my $session=shift;
+
+	if (! defined $session->param("name") ||
+	    ! userinfo_get($session->param("name"), "regdate")) {
+	    	if (! defined $session->param("postsignin")) {
+			$session->param(postsignin => $ENV{QUERY_STRING});
+		}
+		cgi_signin($q, $session);
+		cgi_savesession($session);
+		exit;
+	}
+} #}}}	
+
 sub cgi_signin ($$) { #{{{
 	my $q=shift;
 	my $session=shift;
 
 	eval q{use CGI::FormBuilder};
+	error($@) if $@;
 	my $form = CGI::FormBuilder->new(
 		title => "signin",
-		fields => [qw(do title page subpage from name password confirm_password email)],
-		header => 1,
+		name => "signin",
+		charset => "utf-8",
 		method => 'POST',
-		validate => {
-			confirm_password => {
-				perl => q{eq $form->field("password")},
-			},
-			email => 'EMAIL',
-		},
 		required => 'NONE',
 		javascript => 0,
 		params => $q,
-		action => $q->request_uri,
+		action => $config{cgiurl},
 		header => 0,
-		template => (-e "$config{templatedir}/signin.tmpl" ?
-		              "$config{templatedir}/signin.tmpl" : "")
+		template => {type => 'div'},
+		stylesheet => baseurl()."style.css",
 	);
+	my $buttons=["Login"];
 	
-	$form->field(name => "name", required => 0);
-	$form->field(name => "do", type => "hidden");
-	$form->field(name => "page", type => "hidden");
-	$form->field(name => "title", type => "hidden");
-	$form->field(name => "from", type => "hidden");
-	$form->field(name => "subpage", type => "hidden");
-	$form->field(name => "password", type => "password", required => 0);
-	$form->field(name => "confirm_password", type => "password", required => 0);
-	$form->field(name => "email", required => 0);
-	if ($q->param("do") ne "signin") {
-		$form->text("You need to log in first.");
+	if ($q->param("do") ne "signin" && !$form->submitted) {
+		$form->text(gettext("You need to log in first."));
 	}
+	$form->field(name => "do", type => "hidden", value => "signin",
+		force => 1);
 	
-	if ($form->submitted) {
-		# Set required fields based on how form was submitted.
-		my %required=(
-			"Login" => [qw(name password)],
-			"Register" => [qw(name password confirm_password email)],
-			"Mail Password" => [qw(name)],
-		);
-		foreach my $opt (@{$required{$form->submitted}}) {
-			$form->field(name => $opt, required => 1);
-		}
+	decode_form_utf8($form);
 	
-		# Validate password differently depending on how
-		# form was submitted.
-		if ($form->submitted eq 'Login') {
-			$form->field(
-				name => "password",
-				validate => sub {
-					length $form->field("name") &&
-					shift eq userinfo_get($form->field("name"), 'password');
-				},
-			);
-			$form->field(name => "name", validate => '/^\w+$/');
-		}
-		else {
-			$form->field(name => "password", validate => 'VALUE');
-		}
-		# And make sure the entered name exists when logging
-		# in or sending email, and does not when registering.
-		if ($form->submitted eq 'Register') {
-			$form->field(
-				name => "name",
-				validate => sub {
-					my $name=shift;
-					length $name &&
-					! userinfo_get($name, "regdate");
-				},
-			);
-		}
-		else {
-			$form->field(
-				name => "name",
-				validate => sub {
-					my $name=shift;
-					length $name &&
-					userinfo_get($name, "regdate");
-				},
-			);
-		}
-	}
-	else {
-		# First time settings.
-		$form->field(name => "name", comment => "use FirstnameLastName");
-		$form->field(name => "confirm_password", comment => "(only needed");
-		$form->field(name => "email",            comment => "for registration)");
-		if ($session->param("name")) {
-			$form->field(name => "name", value => $session->param("name"));
-		}
+	run_hooks(formbuilder_setup => sub {
+		shift->(form => $form, cgi => $q, session => $session,
+		        buttons => $buttons);
+	});
+
+	if ($form->submitted) {
+		$form->validate;
 	}
 
-	if ($form->submitted && $form->validate) {
-		if ($form->submitted eq 'Login') {
-			$session->param("name", $form->field("name"));
-			if (defined $form->field("do") && 
-			    $form->field("do") ne 'signin') {
-				print $q->redirect(
-					"$config{cgiurl}?do=".$form->field("do").
-					"&page=".$form->field("page").
-					"&title=".$form->field("title").
-					"&subpage=".$form->field("subpage").
-					"&from=".$form->field("from"));;
-			}
-			else {
-				print $q->redirect($config{url});
-			}
-		}
-		elsif ($form->submitted eq 'Register') {
-			my $user_name=$form->field('name');
-			if (userinfo_setall($user_name, {
-				           'email' => $form->field('email'),
-				           'password' => $form->field('password'),
-				           'regdate' => time
-				         })) {
-				$form->field(name => "confirm_password", type => "hidden");
-				$form->field(name => "email", type => "hidden");
-				$form->text("Registration successful. Now you can Login.");
-				print $session->header();
-				print misctemplate($form->title, $form->render(submit => ["Login"]));
-			}
-			else {
-				error("Error saving registration.");
-			}
-		}
-		elsif ($form->submitted eq 'Mail Password') {
-			my $user_name=$form->field("name");
-			my $template=HTML::Template->new(
-				filename => "$config{templatedir}/passwordmail.tmpl"
-			);
-			$template->param(
-				user_name => $user_name,
-				user_password => userinfo_get($user_name, "password"),
-				wikiurl => $config{url},
-				wikiname => $config{wikiname},
-				REMOTE_ADDR => $ENV{REMOTE_ADDR},
-			);
-			
-			eval q{use Mail::Sendmail};
-			my ($fromhost) = $config{cgiurl} =~ m!/([^/]+)!;
-			sendmail(
-				To => userinfo_get($user_name, "email"),
-				From => "$config{wikiname} admin <".(getpwuid($>))[0]."@".$fromhost.">",
-				Subject => "$config{wikiname} information",
-				Message => $template->output,
-			) or error("Failed to send mail");
-			
-			$form->text("Your password has been emailed to you.");
-			$form->field(name => "name", required => 0);
-			print $session->header();
-			print misctemplate($form->title, $form->render(submit => ["Login", "Register", "Mail Password"]));
-		}
+	showform($form, $buttons, $session, $q);
+} #}}}
+
+sub cgi_postsignin ($$) { #{{{
+	my $q=shift;
+	my $session=shift;
+	
+	# Continue with whatever was being done before the signin process.
+	if (defined $session->param("postsignin")) {
+		my $postsignin=CGI->new($session->param("postsignin"));
+		$session->clear("postsignin");
+		cgi($postsignin, $session);
+		cgi_savesession($session);
+		exit;
 	}
 	else {
-		print $session->header();
-		print misctemplate($form->title, $form->render(submit => ["Login", "Register", "Mail Password"]));
+		# This can occur, for example, if a user went to the signin
+		# url via a bookmark.
+		redirect($q, $config{url});
 	}
 } #}}}
 
@@ -210,162 +211,234 @@ sub cgi_prefs ($$) { #{{{
 	my $q=shift;
 	my $session=shift;
 
+	needsignin($q, $session);
+
 	eval q{use CGI::FormBuilder};
+	error($@) if $@;
 	my $form = CGI::FormBuilder->new(
 		title => "preferences",
-		fields => [qw(do name password confirm_password email locked_pages)],
+		name => "preferences",
 		header => 0,
+		charset => "utf-8",
 		method => 'POST',
 		validate => {
-			confirm_password => {
-				perl => q{eq $form->field("password")},
-			},
 			email => 'EMAIL',
 		},
 		required => 'NONE',
 		javascript => 0,
 		params => $q,
-		action => $q->request_uri,
-		template => (-e "$config{templatedir}/prefs.tmpl" ?
-		              "$config{templatedir}/prefs.tmpl" : "")
+		action => $config{cgiurl},
+		template => {type => 'div'},
+		stylesheet => baseurl()."style.css",
+		fieldsets => [
+			[login => gettext("Login")],
+			[preferences => gettext("Preferences")],
+			[admin => gettext("Admin")]
+		],
 	);
-	my @buttons=("Save Preferences", "Logout", "Cancel");
+	my $buttons=["Save Preferences", "Logout", "Cancel"];
+
+	decode_form_utf8($form);
+
+	run_hooks(formbuilder_setup => sub {
+		shift->(form => $form, cgi => $q, session => $session,
+		        buttons => $buttons);
+	});
 	
-	my $user_name=$session->param("name");
 	$form->field(name => "do", type => "hidden");
-	$form->field(name => "name", disabled => 1,
-		value => $user_name, force => 1);
-	$form->field(name => "password", type => "password");
-	$form->field(name => "confirm_password", type => "password");
-	$form->field(name => "locked_pages", size => 50,
-		comment => "(".htmllink("", "GlobList", 1).")");
+	$form->field(name => "email", size => 50, fieldset => "preferences");
+	$form->field(name => "subscriptions", size => 50,
+		fieldset => "preferences",
+		comment => "(".htmllink("", "", "PageSpec", noimageinline => 1).")");
+	$form->field(name => "banned_users", size => 50,
+		fieldset => "admin");
 	
+	my $user_name=$session->param("name");
 	if (! is_admin($user_name)) {
-		$form->field(name => "locked_pages", type => "hidden");
+		$form->field(name => "banned_users", type => "hidden");
 	}
-	
+
 	if (! $form->submitted) {
 		$form->field(name => "email", force => 1,
 			value => userinfo_get($user_name, "email"));
-		$form->field(name => "locked_pages", force => 1,
-			value => userinfo_get($user_name, "locked_pages"));
+		$form->field(name => "subscriptions", force => 1,
+			value => userinfo_get($user_name, "subscriptions"));
+		if (is_admin($user_name)) {
+			$form->field(name => "banned_users", force => 1,
+				value => join(" ", get_banned_users()));
+		}
 	}
 	
 	if ($form->submitted eq 'Logout') {
 		$session->delete();
-		print $q->redirect($config{url});
+		redirect($q, $config{url});
 		return;
 	}
 	elsif ($form->submitted eq 'Cancel') {
-		print $q->redirect($config{url});
+		redirect($q, $config{url});
 		return;
 	}
-	elsif ($form->submitted eq "Save Preferences" && $form->validate) {
-		foreach my $field (qw(password email locked_pages)) {
-			if (length $form->field($field)) {
-				userinfo_set($user_name, $field, $form->field($field)) || error("failed to set $field");
+	elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
+		foreach my $field (qw(email subscriptions)) {
+			if (defined $form->field($field) && length $form->field($field)) {
+				userinfo_set($user_name, $field, $form->field($field)) ||
+					error("failed to set $field");
 			}
 		}
-		$form->text("Preferences saved.");
+		if (is_admin($user_name)) {
+			set_banned_users(grep { ! is_admin($_) }
+					split(' ',
+						$form->field("banned_users"))) ||
+				error("failed saving changes");
+		}
+		$form->text(gettext("Preferences saved."));
 	}
 	
-	print $session->header();
-	print misctemplate($form->title, $form->render(submit => \@buttons));
+	showform($form, $buttons, $session, $q);
 } #}}}
 
 sub cgi_editpage ($$) { #{{{
 	my $q=shift;
 	my $session=shift;
 
+	my @fields=qw(do rcsinfo subpage from page type editcontent comments);
+	my @buttons=("Save Page", "Preview", "Cancel");
+	
 	eval q{use CGI::FormBuilder};
+	error($@) if $@;
 	my $form = CGI::FormBuilder->new(
-		fields => [qw(do rcsinfo subpage from page content comments)],
-		header => 1,
+		title => "editpage",
+		fields => \@fields,
+		charset => "utf-8",
 		method => 'POST',
 		validate => {
-			content => '/.+/',
+			editcontent => '/.+/',
 		},
-		required => [qw{content}],
+		required => [qw{editcontent}],
 		javascript => 0,
 		params => $q,
-		action => $q->request_uri,
+		action => $config{cgiurl},
+		header => 0,
 		table => 0,
-		template => "$config{templatedir}/editpage.tmpl"
+		template => scalar template_params("editpage.tmpl"),
+		wikiname => $config{wikiname},
 	);
-	my @buttons=("Save Page", "Preview", "Cancel");
 	
-	my ($page)=$form->param('page')=~/$config{wiki_file_regexp}/;
-	if (! defined $page || ! length $page || $page ne $q->param('page') ||
-	    $page=~/$config{wiki_file_prune_regexp}/ || $page=~/^\//) {
+	decode_form_utf8($form);
+	
+	run_hooks(formbuilder_setup => sub {
+		shift->(form => $form, cgi => $q, session => $session,
+			buttons => \@buttons);
+	});
+	
+	# This untaint is safe because titlepage removes any problematic
+	# characters.
+	my ($page)=$form->field('page');
+	$page=titlepage(possibly_foolish_untaint($page));
+	if (! defined $page || ! length $page ||
+	    file_pruned($page, $config{srcdir}) || $page=~/^\//) {
 		error("bad page name");
 	}
-	$page=lc($page);
 	
-	my $file=$page.$config{default_pageext};
-	my $newfile=1;
-	if (exists $pagesources{lc($page)}) {
-		$file=$pagesources{lc($page)};
-		$newfile=0;
+	my $from;
+	if (defined $form->field('from')) {
+		($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
+	}
+	
+	my $file;
+	my $type;
+	if (exists $pagesources{$page} && $form->field("do") ne "create") {
+		$file=$pagesources{$page};
+		$type=pagetype($file);
+		if (! defined $type) {
+			error(sprintf(gettext("%s is not an editable page"), $page));
+		}
+		if (! $form->submitted) {
+			$form->field(name => "rcsinfo",
+				value => rcs_prepedit($file), force => 1);
+		}
+	}
+	else {
+		$type=$form->param('type');
+		if (defined $type && length $type && $hooks{htmlize}{$type}) {
+			$type=possibly_foolish_untaint($type);
+		}
+		elsif (defined $from) {
+			# favor the type of linking page
+			$type=pagetype($pagesources{$from});
+		}
+		$type=$config{default_pageext} unless defined $type;
+		$file=$page.".".$type;
+		if (! $form->submitted) {
+			$form->field(name => "rcsinfo", value => "", force => 1);
+		}
 	}
 
 	$form->field(name => "do", type => 'hidden');
 	$form->field(name => "from", type => 'hidden');
 	$form->field(name => "rcsinfo", type => 'hidden');
 	$form->field(name => "subpage", type => 'hidden');
-	$form->field(name => "page", value => "$page", force => 1);
+	$form->field(name => "page", value => pagetitle($page, 1), force => 1);
+	$form->field(name => "type", value => $type, force => 1);
 	$form->field(name => "comments", type => "text", size => 80);
-	$form->field(name => "content", type => "textarea", rows => 20,
+	$form->field(name => "editcontent", type => "textarea", rows => 20,
 		cols => 80);
 	$form->tmpl_param("can_commit", $config{rcs});
 	$form->tmpl_param("indexlink", indexlink());
 	$form->tmpl_param("helponformattinglink",
-		htmllink("", "HelpOnFormatting", 1));
-	if (! $form->submitted) {
-		$form->field(name => "rcsinfo", value => rcs_prepedit($file),
-			force => 1);
-	}
+		htmllink("", "", "HelpOnFormatting", noimageinline => 1));
+	$form->tmpl_param("baseurl", baseurl());
 	
 	if ($form->submitted eq "Cancel") {
-		print $q->redirect("$config{url}/".htmlpage($page));
+		if ($form->field("do") eq "create" && defined $from) {
+			redirect($q, "$config{url}/".htmlpage($from));
+		}
+		elsif ($form->field("do") eq "create") {
+			redirect($q, $config{url});
+		}
+		else {
+			redirect($q, "$config{url}/".htmlpage($page));
+		}
 		return;
 	}
 	elsif ($form->submitted eq "Preview") {
-		require IkiWiki::Render;
+		my $content=$form->field('editcontent');
+		run_hooks(editcontent => sub {
+			$content=shift->(
+				content => $content,
+				page => $page,
+				cgi => $q,
+				session => $session,
+			);
+		});
 		$form->tmpl_param("page_preview",
-			htmlize($config{default_pageext},
-				linkify($form->field('content'), $page)));
+			htmlize($page, $type,
+			linkify($page, "",
+			preprocess($page, $page,
+			filter($page, $page, $content), 0, 1))));
 	}
-	else {
+	elsif ($form->submitted eq "Save Page") {
 		$form->tmpl_param("page_preview", "");
 	}
 	$form->tmpl_param("page_conflict", "");
 	
-	if (! $form->submitted || $form->submitted eq "Preview" || 
-	    ! $form->validate) {
+	if ($form->submitted ne "Save Page" || ! $form->validate) {
 		if ($form->field("do") eq "create") {
-			if (exists $pagesources{lc($page)}) {
-				# hmm, someone else made the page in the
-				# meantime?
-				print $q->redirect("$config{url}/".htmlpage($page));
-				return;
-			}
-			
 			my @page_locs;
 			my $best_loc;
-			my ($from)=$form->param('from')=~/$config{wiki_file_regexp}/;
 			if (! defined $from || ! length $from ||
-			    $from ne $form->param('from') ||
-			    $from=~/$config{wiki_file_prune_regexp}/ ||
+			    $from ne $form->field('from') ||
+			    file_pruned($from, $config{srcdir}) ||
 			    $from=~/^\// ||
 			    $form->submitted eq "Preview") {
 				@page_locs=$best_loc=$page;
 			}
 			else {
 				my $dir=$from."/";
-				$dir=~s![^/]+/$!!;
+				$dir=~s![^/]+/+$!!;
 				
-				if (length $form->param('subpage') ||
-				    $page eq 'discussion') {
+				if ((defined $form->field('subpage') && length $form->field('subpage')) ||
+				    $page eq gettext('discussion')) {
 					$best_loc="$from/$page";
 				}
 				else {
@@ -375,106 +448,223 @@ sub cgi_editpage ($$) { #{{{
 				push @page_locs, $dir.$page;
 				push @page_locs, "$from/$page";
 				while (length $dir) {
-					$dir=~s![^/]+/$!!;
+					$dir=~s![^/]+/+$!!;
 					push @page_locs, $dir.$page;
 				}
+			}
+			push @page_locs, "$config{userdir}/$page"
+				if length $config{userdir};
 
-				@page_locs = grep {
-					! exists $pagesources{lc($_)} &&
-					! page_locked($_, $session, 1)
-				} @page_locs;
+			@page_locs = grep {
+				! exists $pagecase{lc $_}
+			} @page_locs;
+			if (! @page_locs) {
+				# hmm, someone else made the page in the
+				# meantime?
+				redirect($q, "$config{url}/".htmlpage($page));
+				return;
 			}
 
+			my @editable_locs = grep {
+				check_canedit($_, $q, $session, 1)
+			} @page_locs;
+			if (! @editable_locs) {
+				# let it throw an error this time
+				map { check_canedit($_, $q, $session) } @page_locs;
+			}
+			
+			my @page_types;
+			if (exists $hooks{htmlize}) {
+				@page_types=keys %{$hooks{htmlize}};
+			}
+			
 			$form->tmpl_param("page_select", 1);
 			$form->field(name => "page", type => 'select',
-				options => \@page_locs, value => $best_loc);
-			$form->title("creating ".pagetitle($page));
+				options => [ map { pagetitle($_, 1) } @editable_locs ],
+				value => pagetitle($best_loc, 1));
+			$form->field(name => "type", type => 'select',
+				options => \@page_types);
+			$form->title(sprintf(gettext("creating %s"), pagetitle($page)));
+			
 		}
 		elsif ($form->field("do") eq "edit") {
-			page_locked($page, $session);
-			if (! defined $form->field('content') || 
-			    ! length $form->field('content')) {
+			check_canedit($page, $q, $session);
+			if (! defined $form->field('editcontent') || 
+			    ! length $form->field('editcontent')) {
 				my $content="";
-				if (exists $pagesources{lc($page)}) {
-					$content=readfile("$config{srcdir}/$pagesources{lc($page)}");
+				if (exists $pagesources{$page}) {
+					$content=readfile(srcfile($pagesources{$page}));
 					$content=~s/\n/\r\n/g;
 				}
-				$form->field(name => "content", value => $content,
+				$form->field(name => "editcontent", value => $content,
 					force => 1);
 			}
 			$form->tmpl_param("page_select", 0);
 			$form->field(name => "page", type => 'hidden');
-			$form->title("editing ".pagetitle($page));
+			$form->field(name => "type", type => 'hidden');
+			$form->title(sprintf(gettext("editing %s"), pagetitle($page)));
 		}
 		
-		print $form->render(submit => \@buttons);
+		showform($form, \@buttons, $session, $q);
+		saveindex();
 	}
 	else {
 		# save page
-		page_locked($page, $session);
+		check_canedit($page, $q, $session);
+
+		my $exists=-e "$config{srcdir}/$file";
+
+		if ($form->field("do") ne "create" && ! $exists &&
+		    ! eval { srcfile($file) }) {
+			$form->tmpl_param("page_gone", 1);
+			$form->field(name => "do", value => "create", force => 1);
+			$form->tmpl_param("page_select", 0);
+			$form->field(name => "page", type => 'hidden');
+			$form->field(name => "type", type => 'hidden');
+			$form->title(sprintf(gettext("editing %s"), $page));
+			showform($form, \@buttons, $session, $q);
+			return;
+		}
+		elsif ($form->field("do") eq "create" && $exists) {
+			$form->tmpl_param("creation_conflict", 1);
+			$form->field(name => "do", value => "edit", force => 1);
+			$form->tmpl_param("page_select", 0);
+			$form->field(name => "page", type => 'hidden');
+			$form->field(name => "type", type => 'hidden');
+			$form->title(sprintf(gettext("editing %s"), $page));
+			$form->field("editcontent", 
+				value => readfile("$config{srcdir}/$file").
+				         "\n\n\n".$form->field("editcontent"),
+				force => 1);
+			showform($form, \@buttons, $session, $q);
+			return;
+		}
 		
-		my $content=$form->field('content');
+		my $content=$form->field('editcontent');
+		run_hooks(editcontent => sub {
+			$content=shift->(
+				content => $content,
+				page => $page,
+				cgi => $q,
+				session => $session,
+			);
+		});
 		$content=~s/\r\n/\n/g;
 		$content=~s/\r/\n/g;
-		writefile("$config{srcdir}/$file", $content);
-		
-		my $message="web commit ";
-		if (length $session->param("name")) {
-			$message.="by ".$session->param("name");
-		}
-		else {
-			$message.="from $ENV{REMOTE_ADDR}";
-		}
-		if (defined $form->field('comments') &&
-		    length $form->field('comments')) {
-			$message.=": ".$form->field('comments');
+
+		$config{cgi}=0; # avoid cgi error message
+		eval { writefile($file, $config{srcdir}, $content) };
+		$config{cgi}=1;
+		if ($@) {
+			$form->field(name => "rcsinfo", value => rcs_prepedit($file),
+				force => 1);
+			$form->tmpl_param("failed_save", 1);
+			$form->tmpl_param("error_message", $@);
+			$form->field("editcontent", value => $content, force => 1);
+			$form->tmpl_param("page_select", 0);
+			$form->field(name => "page", type => 'hidden');
+			$form->field(name => "type", type => 'hidden');
+			$form->title(sprintf(gettext("editing %s"), $page));
+			showform($form, \@buttons, $session, $q);
+			return;
 		}
 		
+		my $conflict;
 		if ($config{rcs}) {
-			if ($newfile) {
+			my $message="";
+			if (defined $form->field('comments') &&
+			    length $form->field('comments')) {
+				$message=$form->field('comments');
+			}
+			
+			if (! $exists) {
 				rcs_add($file);
 			}
-			# prevent deadlock with post-commit hook
-			unlockwiki();
-			# presumably the commit will trigger an update
-			# of the wiki
-			my $conflict=rcs_commit($file, $message,
-				$form->field("rcsinfo"));
+
+			# Prevent deadlock with post-commit hook by
+			# signaling to it that it should not try to
+			# do anything (except send commit mails).
+			disable_commit_hook();
+			$conflict=rcs_commit($file, $message,
+				$form->field("rcsinfo"),
+				$session->param("name"), $ENV{REMOTE_ADDR});
+			enable_commit_hook();
+			rcs_update();
+		}
 		
-			if (defined $conflict) {
-				$form->field(name => "rcsinfo", value => rcs_prepedit($file),
-					force => 1);
-				$form->tmpl_param("page_conflict", 1);
-				$form->field("content", value => $conflict, force => 1);
-				$form->field("do", "edit)");
-				$form->tmpl_param("page_select", 0);
-				$form->field(name => "page", type => 'hidden');
-				$form->title("editing $page");
-				print $form->render(submit => \@buttons);
-				return;
-			}
+		# Refresh even if there was a conflict, since other changes
+		# may have been committed while the post-commit hook was
+		# disabled.
+		require IkiWiki::Render;
+		refresh();
+		saveindex();
+
+		if (defined $conflict) {
+			$form->field(name => "rcsinfo", value => rcs_prepedit($file),
+				force => 1);
+			$form->tmpl_param("page_conflict", 1);
+			$form->field("editcontent", value => $conflict, force => 1);
+			$form->field("do", "edit", force => 1);
+			$form->tmpl_param("page_select", 0);
+			$form->field(name => "page", type => 'hidden');
+			$form->field(name => "type", type => 'hidden');
+			$form->title(sprintf(gettext("editing %s"), $page));
+			showform($form, \@buttons, $session, $q);
+			return;
 		}
 		else {
-			require IkiWiki::Render;
-			refresh();
-			saveindex();
+			# The trailing question mark tries to avoid broken
+			# caches and get the most recent version of the page.
+			redirect($q, "$config{url}/".htmlpage($page)."?updated");
 		}
-		
-		# The trailing question mark tries to avoid broken
-		# caches and get the most recent version of the page.
-		print $q->redirect("$config{url}/".htmlpage($page)."?updated");
 	}
 } #}}}
 
-sub cgi () { #{{{
-	eval q{use CGI};
+sub cgi_getsession ($) { #{{{
+	my $q=shift;
+
 	eval q{use CGI::Session};
+	CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
 	
-	my $q=CGI->new;
+	my $oldmask=umask(077);
+	my $session = CGI::Session->new("driver:DB_File", $q,
+		{ FileName => "$config{wikistatedir}/sessions.db" });
+	umask($oldmask);
+
+	return $session;
+} #}}}
+
+sub cgi_savesession ($) { #{{{
+	my $session=shift;
+
+	# Force session flush with safe umask.
+	my $oldmask=umask(077);
+	$session->flush;
+	umask($oldmask);
+} #}}}
+
+sub cgi (;$$) { #{{{
+	my $q=shift;
+	my $session=shift;
+
+	if (! $q) {
+		eval q{use CGI};
+		error($@) if $@;
+	
+		$q=CGI->new;
 	
+		run_hooks(cgi => sub { shift->($q) });
+	}
+
 	my $do=$q->param('do');
 	if (! defined $do || ! length $do) {
-		error("\"do\" parameter missing");
+		my $error = $q->cgi_error;
+		if ($error) {
+			error("Request not processed: $error");
+		}
+		else {
+			error("\"do\" parameter missing");
+		}
 	}
 	
 	# Things that do not need a session.
@@ -482,55 +672,89 @@ sub cgi () { #{{{
 		cgi_recentchanges($q);
 		return;
 	}
-	
-	CGI::Session->name("ikiwiki_session");
 
-	my $oldmask=umask(077);
-	my $session = CGI::Session->new("driver:db_file", $q,
-		{ FileName => "$config{wikistatedir}/sessions.db" });
-	umask($oldmask);
+	# Need to lock the wiki before getting a session.
+	lockwiki();
 	
-	# Everything below this point needs the user to be signed in.
-	if ((! $config{anonok} && ! defined $session->param("name") ||
-	     ! defined $session->param("name") ||
-	     ! userinfo_get($session->param("name"), "regdate")) || $do eq 'signin') {
-		cgi_signin($q, $session);
+	if (! $session) {
+		$session=cgi_getsession($q);
+	}
 	
-		# Force session flush with safe umask.
-		my $oldmask=umask(077);
-		$session->flush;
-		umask($oldmask);
-		
-		return;
+	# Auth hooks can sign a user in.
+	if ($do ne 'signin' && ! defined $session->param("name")) {
+		run_hooks(auth => sub {
+			shift->($q, $session)
+		});
+		if (defined $session->param("name")) {
+			# Make sure whatever user was authed is in the
+			# userinfo db.
+			if (! userinfo_get($session->param("name"), "regdate")) {
+				userinfo_setall($session->param("name"), {
+					email => "",
+					password => "",
+					regdate => time,
+				}) || error("failed adding user");
+			}
+		}
 	}
 	
-	if ($do eq 'create' || $do eq 'edit') {
-		cgi_editpage($q, $session);
+	if (defined $session->param("name") &&
+	    userinfo_get($session->param("name"), "banned")) {
+		print $q->header(-status => "403 Forbidden");
+		$session->delete();
+		print gettext("You are banned.");
+		cgi_savesession($session);
+	}
+
+	run_hooks(sessioncgi => sub { shift->($q, $session) });
+
+	if ($do eq 'signin') {
+		cgi_signin($q, $session);
+		cgi_savesession($session);
+	}
+	elsif (defined $session->param("postsignin")) {
+		cgi_postsignin($q, $session);
 	}
 	elsif ($do eq 'prefs') {
 		cgi_prefs($q, $session);
 	}
-	elsif ($do eq 'blog') {
-		# munge page name to be valid, no matter what freeform text
-		# is entered
-		my $page=lc($q->param('title'));
-		$page=~y/ /_/;
-		$page=~s/([^-A-Za-z0-9_:+\/])/"__".ord($1)."__"/eg;
-		# if the page already exist, munge it to be unique
-		my $from=$q->param('from');
-		my $add="";
-		while (exists $oldpagemtime{"$from/$page$add"}) {
-			$add=1 unless length $add;
-			$add++;
-		}
-		$q->param('page', $page.$add);
-		# now run same as create
-		$q->param('do', 'create');
+	elsif ($do eq 'create' || $do eq 'edit') {
 		cgi_editpage($q, $session);
 	}
+	elsif ($do eq 'postsignin') {
+		error(gettext("login failed, perhaps you need to turn on cookies?"));
+	}
 	else {
 		error("unknown do parameter");
 	}
 } #}}}
 
+sub userlink ($) { #{{{
+	my $user=shift;
+
+	eval q{use CGI 'escapeHTML'};
+	error($@) if $@;
+	if ($user =~ m!^https?://! &&
+	    eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
+		# Munge user-urls, as used by eg, OpenID.
+		my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
+		my $display=$oid->display;
+		# Convert "user.somehost.com" to "user [somehost.com]".
+		if ($display !~ /\[/) {
+			$display=~s/^(.*?)\.([^.]+\.[a-z]+)$/$1 [$2]/;
+		}
+		# Convert "http://somehost.com/user" to "user [somehost.com]".
+		if ($display !~ /\[/) {
+			$display=~s/^https?:\/\/(.+)\/([^\/]+)$/$2 [$1]/;
+		}
+		$display=~s!^https?://!!; # make sure this is removed
+		return "<a href=\"$user\">".escapeHTML($display)."</a>";
+	}
+	else {
+		return htmllink("", "", escapeHTML(
+			length $config{userdir} ? $config{userdir}."/".$user : $user
+		), noimageinline => 1);
+	}
+} #}}}
+
 1