comments: Save comments as a file with one big [[!comment]] directive.

This delays all comment formatting until the last possible time, allows
us to set metadata without worrying that commenters may be able to evade
it, and means that changes to how a comment is saved can be handled
gracefully. It also gives us somewhere to put the commenter's username
or IP address for later reference.

2 files changed, 108 insertions, 62 deletions

diff --git a/IkiWiki/Plugin/comments.pm b/IkiWiki/Plugin/comments.pm
index 73f8d6140..13ced6ffd 100644
--- a/IkiWiki/Plugin/comments.pm
+++ b/IkiWiki/Plugin/comments.pm
@@ -8,6 +8,7 @@ package IkiWiki::Plugin::comments;
 use warnings;
 use strict;
 use IkiWiki 2.00;
+use Encode;
 
 use constant PREVIEW => "Preview";
 use constant POST_COMMENT => "Post comment";
@@ -16,18 +17,96 @@ use constant CANCEL => "Cancel";
 sub import { #{{{
 	hook(type => "checkconfig", id => 'comments',  call => \&checkconfig);
 	hook(type => "getsetup", id => 'comments',  call => \&getsetup);
+	hook(type => "preprocess", id => 'comment', call => \&preprocess);
 	hook(type => "sessioncgi", id => 'comment', call => \&sessioncgi);
 	hook(type => "htmlize", id => "_comment", call => \&htmlize);
 	hook(type => "pagetemplate", id => "comments", call => \&pagetemplate);
 	hook(type => "cgi", id => "comments", call => \&linkcgi);
-	IkiWiki::loadplugin("inline");
 	IkiWiki::loadplugin("mdwn");
+	IkiWiki::loadplugin("inline");
 } # }}}
 
 sub htmlize { # {{{
-	eval q{use IkiWiki::Plugin::mdwn};
-	error($@) if ($@);
-	return IkiWiki::Plugin::mdwn::htmlize(@_)
+	my %params = @_;
+	return $params{content};
+} # }}}
+
+sub preprocess { # {{{
+	my %params = @_;
+	my $page = $params{page};
+
+	my $format = $params{format};
+	if (defined $format && !exists $IkiWiki::hooks{htmlize}{$format}) {
+		error(sprintf(gettext("unsupported page format %s"), $format));
+	}
+
+	my $content = $params{content};
+	if (!defined $content) {
+		error(gettext("comment must have content"));
+	}
+	$content =~ s/\\"/"/g;
+
+	$content = IkiWiki::filter($page, $params{destpage}, $content);
+
+	if ($config{comments_allowdirectives}) {
+		$content = IkiWiki::preprocess($page, $params{destpage},
+			$content);
+	}
+
+	# no need to bother with htmlize if it's just HTML
+	$content = IkiWiki::htmlize($page, $params{destpage}, $format,
+		$content) if defined $format;
+
+	IkiWiki::run_hooks(sanitize => sub {
+		$content = shift->(
+			page => $page,
+			destpage => $params{destpage},
+			content => $content,
+		);
+	});
+
+	# override any metadata
+
+	if (defined $params{username}) {
+		my ($authorurl, $author) = linkuser($params{username});
+		$pagestate{$page}{meta}{author} = $author;
+		$pagestate{$page}{meta}{authorurl} = $authorurl;
+	}
+	elsif (defined $params{ip}) {
+		$pagestate{$page}{meta}{author} = sprintf(
+			gettext("Anonymous (IP: %s)"),
+			$params{ip});
+		delete $pagestate{$page}{meta}{authorurl};
+	}
+	else {
+		$pagestate{$page}{meta}{author} = gettext("Anonymous");
+		delete $pagestate{$page}{meta}{authorurl};
+	}
+
+	if (defined $params{subject}) {
+		$pagestate{$page}{meta}{title} = $params{subject};
+	}
+	else {
+		delete $pagestate{$page}{meta}{title};
+	}
+
+	my $baseurl = urlto($params{destpage}, undef, 1);
+	my $anchor = "";
+	my $comments_pagename = $config{comments_pagename};
+	if ($params{page} =~ m/\/(\Q${comments_pagename}\E\d+)$/) {
+		$anchor = $1;
+	}
+	$pagestate{$page}{meta}{permalink} = "${baseurl}#${anchor}";
+
+	eval q{use Date::Parse};
+	if (! $@) {
+		my $time = str2time($params{date});
+		$IkiWiki::pagectime{$page} = $time if defined $time;
+	}
+
+	# FIXME: hard-coded HTML (although it's just to set an ID)
+	return "<div id=\"$anchor\">$content</div>" if $anchor;
+	return $content;
 } # }}}
 
 sub getsetup () { #{{{
@@ -143,9 +222,9 @@ sub linkuser ($) { # {{{
 		return (IkiWiki::cgiurl(
 				do => 'commenter',
 				page => (length $config{userdir}
-					? "$config{userdir}/"
-					: "")
-			).$user, $user);
+					? "$config{userdir}/$user"
+					: "$user")
+			), $user);
 	}
 } # }}}
 
@@ -246,17 +325,6 @@ sub sessioncgi ($$) { #{{{
 	my $body = $form->field('body') || '';
 	$body =~ s/\r\n/\n/g;
 	$body =~ s/\r/\n/g;
-	$body .= "\n" if $body !~ /\n$/;
-
-	unless ($allow_directives) {
-		# don't allow new-style directives at all
-		$body =~ s/(^|[^\\])\[\[!/$1&#91;&#91;!/g;
-
-		# don't allow [[ unless it begins an old-style
-		# wikilink, if prefix_directives is off
-		$body =~ s/(^|[^\\])\[\[(?![^\n\s\]+]\]\])/$1&#91;&#91;!/g
-			unless $config{prefix_directives};
-	}
 
 	# FIXME: check that the wiki is locked right now, because
 	# if it's not, there are mad race conditions!
@@ -272,27 +340,29 @@ sub sessioncgi ($$) { #{{{
 
 	my $anchor = "${comments_pagename}${i}";
 
-	IkiWiki::run_hooks(sanitize => sub {
-		$body=shift->(
-			page => $location,
-			destpage => $location,
-			content => $body,
-		);
-	});
+	$body =~ s/"/\\"/g;
+	my $content = "[[!comment format=mdwn\n";
+
+	# FIXME: handling of double quotes probably wrong?
+	if (defined $session->param('name')) {
+		my $username = $session->param('name');
+		$username =~ s/"/&quot;/g;
+		$content .= " username=\"$username\"\n";
+	}
+	elsif (defined $ENV{REMOTE_ADDR}) {
+		my $ip = $ENV{REMOTE_ADDR};
+		if ($ip =~ m/^([.0-9]+)$/) {
+			$content .= " ip=\"$1\"\n";
+		}
+	}
+
+	my $subject = $form->field('subject');
+	$subject =~ s/"/&quot;/g;
+	$content .= " subject=\"$subject\"\n";
+
+	$content .= " date=\"" . IkiWiki::formattime(time, '%X %x') . "\"\n";
 
-	# In this template, the [[!meta]] directives should stay at the end,
-	# so that they will override anything the user specifies. (For
-	# instance, [[!meta author="I can fake the author"]]...)
-	my $content_tmpl = template('comments_comment.tmpl');
-	$content_tmpl->param(author => $author);
-	$content_tmpl->param(authorurl => $authorurl);
-	$content_tmpl->param(subject => $form->field('subject'));
-	$content_tmpl->param(body => $body);
-	$content_tmpl->param(anchor => "$anchor");
-	$content_tmpl->param(permalink => "$baseurl#$anchor");
-	$content_tmpl->param(date => IkiWiki::formattime(time, "%X %x"));
-
-	my $content = $content_tmpl->output;
+	$content .= " content=\"\"\"\n$body\n\"\"\"]]\n";
 
 	# This is essentially a simplified version of editpage:
 	# - the user does not control the page that's created, only the parent
diff --git a/templates/comments_comment.tmpl b/templates/comments_comment.tmpl
deleted file mode 100644
index 8e6affb0d..000000000
--- a/templates/comments_comment.tmpl
+++ /dev/null
@@ -1,24 +0,0 @@
-<TMPL_IF NAME="ANCHOR">
-<div id="<TMPL_VAR ANCHOR ESCAPE=HTML>">
-</TMPL_IF>
-
-<TMPL_VAR BODY>
-<TMPL_IF NAME="SUBJECT">
-[[!meta title="<TMPL_VAR NAME="SUBJECT" ESCAPE=HTML>"]]
-</TMPL_IF>
-<TMPL_IF NAME="AUTHOR">
-[[!meta author="<TMPL_VAR NAME="AUTHOR" ESCAPE=HTML>"]]
-</TMPL_IF>
-<TMPL_IF NAME="AUTHORURL">
-[[!meta authorurl="<TMPL_VAR NAME="AUTHORURL" ESCAPE=HTML>"]]
-</TMPL_IF>
-<TMPL_IF NAME="PERMALINK">
-[[!meta permalink="<TMPL_VAR PERMALINK ESCAPE=HTML>"]]
-</TMPL_IF>
-<TMPL_IF NAME="DATE">
-[[!meta date="<TMPL_VAR DATE ESCAPE=HTML>"]]
-</TMPL_IF>
-
-<TMPL_IF NAME="ANCHOR">
-</div>
-</TMPL_IF>