path: root/IkiWiki/CGI.pm

#!/usr/bin/perl

use warnings;
use strict;
use IkiWiki;
use IkiWiki::UserInfo;
use open qw{:utf8 :std};
use Encode;

package IkiWiki;

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 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 $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;
} #}}}

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;
    
    # 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");

    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 => $changelog,
        baseurl => baseurl(),
    );
    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",
        name => "signin",
        header => 1,
        charset => "utf-8",
        method => 'POST',
        required => 'NONE',
        javascript => 0,
        params => $q,
        action => $config{cgiurl},
        header => 0,
        template => {type => 'div'},
        stylesheet => baseurl()."style.css",
    );
    my $buttons=["Login"];
    
    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);
    
    run_hooks(formbuilder_setup => sub {
        shift->(form => $form, cgi => $q, session => $session);
    });
    
    decode_form_utf8($form);

    if (exists $hooks{formbuilder}) {
        run_hooks(formbuilder => sub {
            shift->(form => $form, cgi => $q, session => $session,
                buttons => $buttons);
        });
    }
    else {
        if ($form->submitted) {
            $form->validate;
        }
        printheader($session);
        print misctemplate($form->title, $form->render(submit => $buttons));
    }
} #}}}

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 {
        # This can occur, for example, if a user went to the signin
        # url via a bookmark.
        redirect($q, $config{url});
    }
} #}}}

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",
        name => "preferences",
        header => 0,
        charset => "utf-8",
        method => 'POST',
        validate => {
            email => 'EMAIL',
        },
        required => 'NONE',
        javascript => 0,
        params => $q,
        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"];

    run_hooks(formbuilder_setup => sub {
        shift->(form => $form, cgi => $q, session => $session);
    });
    
    $form->field(name => "do", type => "hidden");
    $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 => "banned_users", type => "hidden");
    }

    if (! $form->submitted) {
        $form->field(name => "email", force => 1,
            value => userinfo_get($user_name, "email"));
        $form->field(name => "subscriptions", force => 1,
            value => userinfo_get($user_name, "subscriptions"));
        if (is_admin($user_name)) {
            $form->field(name => "banned_users", force => 1,
                value => join(" ", get_banned_users()));
        }
    }
    
    decode_form_utf8($form);
    
    if ($form->submitted eq 'Logout') {
        $session->delete();
        redirect($q, $config{url});
        return;
    }
    elsif ($form->submitted eq 'Cancel') {
        redirect($q, $config{url});
        return;
    }
    elsif ($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 $field");
            }
        }
        if (is_admin($user_name)) {
            set_banned_users(grep { ! is_admin($_) }
                    split(' ',
                        $form->field("banned_users"))) ||
                error("failed saving changes");
        }
        $form->text(gettext("Preferences saved."));
    }
    
    if (exists $hooks{formbuilder}) {
        run_hooks(formbuilder => sub {
            shift->(form => $form, cgi => $q, session => $session,
                buttons => $buttons);
        });
    }
    else {
        printheader($session);
        print misctemplate($form->title, $form->render(submit => $buttons));
    }
} #}}}

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 => \@fields,
        header => 1,
        charset => "utf-8",
        method => 'POST',
        validate => {
            editcontent => '/.+/',
        },
        required => [qw{editcontent}],
        javascript => 0,
        params => $q,
        action => $config{cgiurl},
        header => 0,
        table => 0,
        template => scalar template_params("editpage.tmpl"),
        wikiname => $config{wikiname},
    );
    
    run_hooks(formbuilder_setup => sub {
        shift->(form => $form, cgi => $q, session => $session);
    });
    
    decode_form_utf8($form);
    
    # 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");
    }
    
    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');
    $form->field(name => "page", value => pagetitle($page, 1), force => 1);
    $form->field(name => "type", value => $type, force => 1);
    $form->field(name => "comments", type => "text", size => 80);
    $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", noimageinline => 1));
    $form->tmpl_param("baseurl", baseurl());
    
    if ($form->submitted eq "Cancel") {
        if ($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") {
        $form->tmpl_param("page_preview",
            htmlize($page, $type,
            linkify($page, "",
            preprocess($page, $page,
            filter($page, $page, $form->field('editcontent')), 0, 1))));
    }
    else {
        $form->tmpl_param("page_preview", "");
    }
    $form->tmpl_param("page_conflict", "");
    
    if (! $form->submitted || $form->submitted eq "Preview" || 
        ! $form->validate) {
        if ($form->field("do") eq "create") {
            my @page_locs;
            my $best_loc;
            if (! defined $from || ! length $from ||
                $from ne $form->field('from') ||
                file_pruned($from, $config{srcdir}) ||
                $from=~/^\// ||
                $form->submitted eq "Preview") {
                @page_locs=$best_loc=$page;
            }
            else {
                my $dir=$from."/";
                $dir=~s![^/]+/+$!!;
                
                if ((defined $form->field('subpage') && length $form->field('subpage')) ||
                    $page eq gettext('discussion')) {
                    $best_loc="$from/$page";
                }
                else {
                    $best_loc=$dir.$page;
                }
                
                push @page_locs, $dir.$page;
                push @page_locs, "$from/$page";
                while (length $dir) {
                    $dir=~s![^/]+/+$!!;
                    push @page_locs, $dir.$page;
                }
            }
            push @page_locs, "$config{userdir}/$page"
                if length $config{userdir};

            @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);
            $form->field(name => "page", type => 'select',
                options => [ map { pagetitle($_, 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 ($form->field("do") eq "edit") {
            check_canedit($page, $q, $session);
            if (! defined $form->field('editcontent') || 
                ! length $form->field('editcontent')) {
                my $content="";
                if (exists $pagesources{$page}) {
                    $content=readfile(srcfile($pagesources{$page}));
                    $content=~s/\n/\r\n/g;
                }
                $form->field(name => "editcontent", value => $content,
                    force => 1);
            }
            $form->tmpl_param("page_select", 0);
            $form->field(name => "page", type => 'hidden');
            $form->field(name => "type", type => 'hidden');
            $form->title(sprintf(gettext("editing %s"), pagetitle($page)));
        }
        
        printheader($session);
        print misctemplate($form->title, $form->render(submit => \@buttons));
    }
    else {
        # save page
        check_canedit($page, $q, $session);
        if (! -e "$config{srcdir}/$file" &&
            $form->field("do") ne "create") {
            $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"), $page));
            printheader($session);
            print misctemplate($form->title, $form->render(submit => \@buttons));
            return;
        }
        elsif (-e "$config{srcdir}/$file" &&
               $form->field("do") eq "create") {
            $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);
            printheader($session);
            print misctemplate($form->title, $form->render(submit => \@buttons));
            return;
        }
        
        my $content=$form->field('editcontent');

        $content=~s/\r\n/\n/g;
        $content=~s/\r/\n/g;

        $config{cgi}=0; # avoid cgi error message
        eval { writefile($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"), $page));
            printheader($session);
            print misctemplate($form->title, $form->render(submit => \@buttons));
            return;
        }
        
        my $conflict;
        if ($config{rcs}) {
            my $message="";
            if (defined $form->field('comments') &&
                length $form->field('comments')) {
                $message=$form->field('comments');
            }
            
            if ($form->field("do") eq "create") {
                rcs_add($file);
            }

            # 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();
        }
        
        # 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"), $page));
            printheader($session);
            print misctemplate($form->title, $form->render(submit => \@buttons));
            return;
        }
        else {
            # The trailing question mark tries to avoid broken
            # caches and get the most recent version of the page.
            redirect($q, "$config{url}/".htmlpage($page)."?updated");
        }
    }
} #}}}

sub cgi_getsession ($) { #{{{
    my $q=shift;

    eval q{use CGI::Session};
    CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
    
    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) {
        my $error = $q->cgi_error;
        if ($error) {
            error("Request not processed: $error");
        }
        else {
            error("\"do\" parameter missing");
        }
    }
    
    # Things that do not need a session.
    if ($do eq 'recentchanges') {
        cgi_recentchanges($q);
        return;
    }

    # Need to lock the wiki before getting a session.
    lockwiki();
    
    if (! $session) {
        $session=cgi_getsession($q);
    }
    
    # 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 (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 '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);
    }
} #}}}

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