From fcf5549584b69e62b6c2f0eb919f6799c7904211 Mon Sep 17 00:00:00 2001
From: "Jannis M. Hoffmann" <jannis@fehcom.de>
Date: Fri, 10 Mar 2023 13:54:57 +0100
Subject: Proper recursive rendering of mails to html 1. Added raw mode to
 model 2. Added raw route 3. Moved readmail view parts to RenderMail plugin 4.
 Renamed displayheaders partial templates

---
 lib/JWebmail/Plugin/RenderMail.pm | 182 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 lib/JWebmail/Plugin/RenderMail.pm

(limited to 'lib/JWebmail/Plugin/RenderMail.pm')

diff --git a/lib/JWebmail/Plugin/RenderMail.pm b/lib/JWebmail/Plugin/RenderMail.pm
new file mode 100644
index 0000000..4417fae
--- /dev/null
+++ b/lib/JWebmail/Plugin/RenderMail.pm
@@ -0,0 +1,182 @@
+package JWebmail::Plugin::RenderMail;
+
+use Mojo::Base 'Mojolicious::Plugin';
+
+use Mojo::ByteStream;
+use Mojo::Util 'xml_escape';
+
+
+sub render_text_plain {
+    my ($_c, $_subtype, $content, $_path) = @_;
+
+    $content = xml_escape($content);
+    $content =~ s/\n/<br>/g;
+
+    return qq'<div class="jwm-mail-body jwm-mail-body-text-plain">\n $content </div>\n';
+}
+
+sub render_text_html {
+    my ($c, $_subtype, $_content, $path) = @_;
+
+    my $url = $c->url_for('raw', id => $c->stash('id'));
+    $url = $url->query(path => join('.', @$path)) if @$path;
+
+    return qq'<iframe src="$url" class="jwm-mail-body-text-html" ></iframe>\n';
+}
+
+sub render_multipart_alternative {
+    my ($c, $_subtype, $content, $path) = @_;
+
+    my $parts = $content->{parts};
+    my $R = qq'<div class="jwm-mail-body jwm-mail-body-multipart-alternative"\n>';
+    my $i = 0;
+    my $end;
+
+    for (reverse @$parts) {
+        if (!$end) {
+            my $x = mime_render($c, to_mime_types($_->{head}), $_->{body}, [@$path, $#$parts-$i]);
+            if ($x) {
+                $R .= $x;
+                $end = 1;
+            }
+        }
+        else {
+            $R .= '<details class="jwm-mail-body-multipart-alternative-extra" >';
+            $R .= '<summary>';
+            $R .= to_mime_type($_->{head});
+            $R .= "</summary>\n";
+            $R .= mime_render($c, to_mime_types($_->{head}), $_->{body}, [@$path, $#$parts-$i]);
+            $R .= "</details>\n";
+        }
+        ++$i;
+    }
+    return $R . "</div>\n";
+}
+
+sub render_multipart {
+    my ($c, $_subtype, $content, $path) = @_;
+
+    my $parts = $content->{parts};
+    my $R = qq'<div class="jwm-mail-body jwm-mail-body-multipart"\n>';
+    my $i = 0;
+
+    for (@$parts) {
+        if (     !$_->{head}{content_disposition}
+            || lc $_->{head}{content_disposition} eq 'none'
+            || lc $_->{head}{content_disposition} eq 'inline') {
+
+            $R .= mime_render($c, to_mime_types($_->{head}), $_->{body}, [@$path, $i]);
+        }
+        elsif (lc $_->{head}{content_disposition} eq 'attachment') {
+            $R .= '<p>';
+            $R .= $c->link_to($c->url_for(raw => id => $c->stash('id'))->query(path => join('.', @$path, $i))->to_abs, (download => $_->{head}{filename}) => sub {
+                'Attachment ' . xml_escape($_->{head}{filename}) . ' of type ' . to_mime_type($c, $_->{head});
+            });
+            $R .= "</p>\n";
+        }
+        else {
+            warn "unknown Content-Disposition '$_->{head}{content_disposition}'";
+            $R .= "<p>unknown Content-Disposition '$_->{head}{content_disposition}'</p>\n";
+        }
+        ++$i;
+    }
+    return $R . "</div>\n";
+}
+
+sub _format_header {
+    my ($c, $category, $value) = @_;
+
+    my $R = '';
+
+    if (ref $value eq 'ARRAY' && $value->@*) {
+        $R .= '<dt>' . xml_escape(uc $c->l($category)) . "</dt>\n";
+        for ($value->@*) {
+            $R .= '<dd>';
+            $R .= xml_escape($_->{display_name} ? qq("$_->{display_name}" <$_->{address}>) : "$_->{address}");
+            $R .= "<dd>\n";
+        }
+    }
+    return $R;
+}
+
+sub render_message {
+    my ($c, $subtype, $msg, $path) = @_;
+
+    warn "unkown mime-subtype $subtype" unless $subtype eq 'rfc822';
+
+    my $R .= '<div clas="jwm-mail">';
+
+    $R .= '<dl class="jwm-mail-header">';
+    $R .= '<dt>' . xml_escape(uc $c->l('subject')) . '</dt>';
+    $R .= '<dd>' . xml_escape($msg->{head}{subject}) . "</dd>\n";
+    $R .= _format_header($c, from => $msg->{head}{from});
+    $R .= _format_header($c, to   => $msg->{head}{to});
+    $R .= _format_header($c, cc   => $msg->{head}{cc});
+    $R .= _format_header($c, bcc  => $msg->{head}{bcc});
+    $R .= '<dt>' . xml_escape(uc $c->l('date')) . '</dt>';
+    $R .= '<dd>' . xml_escape($msg->{head}{date}) . "</dd>\n";
+    $R .= '<dt>' . xml_escape(uc $c->l('content-type')) . '</dt>';
+    $R .= '<dd>' . to_mime_type($msg->{head}{mime}) . "</dd>\n";
+    $R .= "</dl>\n";
+
+    #my $content = ref $msg->{body} && exists $msg->{body}{parts} ? $msg->{body}{parts} : $msg->{body};
+
+    $R .= mime_render($c, to_mime_types($msg->{head}{mime}), $msg->{body}, [@$path, 0]);
+
+    return $R . "</div>\n";
+}
+
+our %MIME_Render_Subs = (
+    'text/plain'            => \&render_text_plain,
+    'text/html'             => \&render_text_html,
+    'multipart/alternative' => \&render_multipart_alternative,
+    'multipart'             => \&render_multipart,
+    'message'               => \&render_message,
+);
+
+sub mime_render {
+    my ($c, $maintype, $subtype, $content, $path) = @_;
+
+    my $renderer = $MIME_Render_Subs{"$maintype/$subtype"} || $MIME_Render_Subs{$maintype};
+
+    unless ($renderer) {
+        return "<p>Unsupported MIME type of <code>$maintype/$subtype</code>.</p>\n";
+    }
+
+    return $renderer->($c, $subtype, $content, $path);
+}
+
+
+sub to_mime_type  { lc xml_escape("$_[0]->{content_maintype}/$_[0]->{content_subtype}") }
+sub to_mime_types { return xml_escape($_[0]->{content_maintype}), xml_escape($_[0]->{content_subtype}) }
+
+
+sub register {
+    my ($self, $app, $conf) = @_;
+    $conf //= {};
+
+    $app->helper('render_mail.format_mail' => sub { Mojo::ByteStream->new(mime_render($_[0], 'message', 'rfc822', $_[1], [])) });
+    $app->helper(to_mime_type => sub { shift; to_mime_type(@_) });
+}
+
+1
+
+__END__
+
+=encoding utf-8
+
+=head1 NAME
+
+JWebmail::Plugin::RenderMail - Does the heavy lifting of converting an E-Mail to HTML
+
+=head1 HELPERS
+
+=head2 render_mail.format_mail
+
+Renders a mail to html recursively.
+
+=head2 to_mime_type
+
+Combines the content_maintype and content_subtype attributes into the regular MIME description.
+These attributes are found in a mail head mime section or as head for multipart messages.
+
-- 
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