From 4ac055111effc3c6e068f5df61e82fca903b1e4a Mon Sep 17 00:00:00 2001
From: Max Maischein <corion@corion.net>
Date: Sat, 13 Jul 2013 17:15:48 +0200
Subject: Add `inline_images` setting to optionally inline images in the MIME
 object

This is higly convenient if you want to read RSS content offline.
---
 lib/Feed/HelperRole/Mail.pm | 46 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/lib/Feed/HelperRole/Mail.pm b/lib/Feed/HelperRole/Mail.pm
index e0e239e..1279ac8 100644
--- a/lib/Feed/HelperRole/Mail.pm
+++ b/lib/Feed/HelperRole/Mail.pm
@@ -13,6 +13,10 @@ use Template::Stash::ForceUTF8;
 use Moose::Util::TypeConstraints;
 use Try::Tiny;
 
+use List::MoreUtils qw(uniq);
+use Text::CleanFragment;
+use URI;
+
 subtype 'ArrayOfStr', as 'ArrayRef[Str]';
 coerce 'ArrayOfStr', from 'Str', via { [ $_ ] };
 
@@ -45,6 +49,11 @@ has date_formatter => (
     lazy_build => 1,
 );
 
+has inline_images => (
+    is => 'ro',
+    isa => 'Bool',
+);
+
 sub _build_tt {
     my ($self) = @_;
 
@@ -91,12 +100,49 @@ sub entry_to_mime {
         Subject => encode('MIME-Header',$subject),
         Type => 'multipart/related',
     );
+
+    my @images;
+    if( $self->inline_images ) {
+        # We expect fairly clean HTML here...
+        my $base= $entry->link;
+        my @links= uniq $body=~ m/<img\s[^>]*\bsrc="([^"]+)".*?>/ig;
+
+        # Fetch all images, append them
+        my $ua= $self->user_agent;
+        for my $image ( @links ) {
+            my $url= URI->new_abs( $image, $base );
+            $self->log->trace( "Retrieving '$url' for inlining" );
+            my $res= $ua->get( $url, Referer => $base );
+            if( not $res->is_success ) {
+                $self->log->error("Error retrieving linked image URL '$url': " . $res->status_line );
+                next
+            };
+
+            my $name= clean_fragment( $image );
+            my $id= sprintf "cid:$name";
+
+            $body=~ s!src\s*=\s*"\Q$image\E"!src="$id"!g;
+            push @images, {
+                Type => $res->content_type,
+                Id   => $name,
+                Data => $res->content,
+                Filename => $name,
+            };
+        };
+    };
+
     $msg->attach(
         Type => 'text/html; charset=utf-8',
         Data => encode('utf-8',$body),
         Encoding => 'quoted-printable',
     );
 
+    for my $image (@images) {
+        # rewrite the HTML to reference the images
+        $self->log->trace( "Attaching " . $image->{Type} );
+        $msg->attach(%$image);
+    };
+
     $msg->add('Message-Id', "<$id.feeder\@localhost>");
     my @tags = $entry->tags;
     try { @tags = map { decode('utf-8',$_) } @tags };
-- 
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