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package Digest::MD5::File;

use strict;
use warnings;
use Carp;
use Digest::MD5;
eval { require Encode; };
use LWP::UserAgent;

require Exporter;
our @ISA = qw(Exporter Digest::MD5);
our @EXPORT_OK = qw(dir_md5  dir_md5_hex  dir_md5_base64 
                    file_md5 file_md5_hex file_md5_base64 
                    url_md5  url_md5_hex  url_md5_base64);

our $BINMODE  = 1;
our $UTF8     = 0;
our $NOFATALS = 0;

sub import {
    my $me = shift;
    my %imp;

@imp{ @_ } = ();
    for(@EXPORT_OK) {
        delete $imp{$_} if exists($imp{$_});
    }

$BINMODE  = 0 if exists $imp{-nobin};
    $UTF8     = 1 if exists $imp{-utf8};
    $NOFATALS = 1 if exists $imp{-nofatals};

for(keys %imp) { 
        s/^-//;
        $imp{$_}='' unless $_ =~ m/^(no)?(bin|utf8|fatals)$/;
        push @EXPORT_OK, $_ unless $_ =~ m/^(no)?(bin|utf8|fatals)$/;
        delete $imp{"-$_"} if exists $imp{"-$_"};
    }

$me->export_to_level(1, $me, grep(!/^-/, @_));
    Digest::MD5->import(keys %imp);
}

our $VERSION = '0.08';

my $getfh = sub {
    my $file = shift;

croak "$file: Does not exist" if !-e $file && !$NOFATALS;
    croak "$file: Is a directory" if -d $file && !$NOFATALS;

if(-e $file && !-d $file) {
        open my $fh, $file or return;
        binmode $fh if $BINMODE;
        return $fh;
    } 
    else { return undef; }
};

my $getur = sub {
    my $res = LWP::UserAgent->new->get(shift());
    return $res->is_success ? $res->content : undef;
};

sub Digest::MD5::adddir {
    my $md5  = shift;
    my $base = shift;
    for my $key ( sort keys %{ _dir($base, undef, undef, 3) }) {
        next if !$key;
        my $file = File::Spec->catfile($base, $key);
        $md5->addpath($file) or carp "addpath $file failed: $!" if !-d $file;
    }
    return 1;
}

sub _dir {
    my($dir, $hr, $base, $type, $cc) = @_;
    require File::Spec;  # only load it if its needed

$cc   = {} if ref $cc ne 'HASH'; 
    $hr   = {} if ref $hr ne 'HASH';
    $base = $dir if !defined $base;
    $type = 0 if ! defined $type;

my $_md5func = \&file_md5;
    $_md5func    = \&file_md5_hex    if $type eq '1';
    $_md5func    = \&file_md5_base64 if $type eq '2';

opendir(DIR, $dir) or return;
    my @dircont = sort grep { $_ ne '.' && $_ ne '..' } readdir(DIR);
    closedir DIR;

for my $file( @dircont ) {
        my $_dirver = File::Spec->catdir($dir, $file);
        my $full    = -d $_dirver ? $_dirver 
                                  : File::Spec->catfile($dir, $file);

my $short = File::Spec->abs2rel( $full, $base );
		
        if(-l $full) {
            my $target = readlink $full;
            $full      = $target if -d $target;
        }

if(exists $hr->{$full}) {
            carp "$full seen already, you may have circular links";
            $cc->{$full}++;
            croak "$full is in a circular link, bailing out." 
                if $cc->{$full} > 4;
        }

if(-d $full) {
            $hr->{ $short } = '';
            _dir($full, $hr, $base, $type, $cc) or return;
        }
        else {
            $hr->{ $short } = '';
            $hr->{ $short } = $_md5func->( $full ) or return if $type ne '3';
        } 
    }   
    return $hr;
}

sub dir_md5 {
    push @_, undef if @_ < 3;
    push @_, undef if @_ < 3;
    _dir(@_, 0);
}

sub dir_md5_hex {
    push @_, undef if @_ < 3;
    push @_, undef if @_ < 3;
    _dir(@_, 1);
}

sub dir_md5_base64 {
    push @_, undef if @_ < 3;
    push @_, undef if @_ < 3;
    _dir(@_, 2);
}

sub file_md5 {
    my ($file,$bn,$ut)   = @_;
    local $BINMODE = $bn if defined $bn;
    local $UTF8    = $ut if defined $ut;
    my $fh         = $getfh->($file) or return;
    
    my $md5 = Digest::MD5->new();
    my $buf;
    while(my $l = read($fh, $buf, 1024)) {
	    $md5->add( $UTF8 ? Encode::encode_utf8($buf) : $buf );
    }
    return $md5->digest;
}

sub file_md5_hex {
    my ($file,$bn,$ut)   = @_;
    local $BINMODE = $bn if defined $bn;
    local $UTF8    = $ut if defined $ut;
    my $fh         = $getfh->($file) or return;
    
    my $md5 = Digest::MD5->new();
    my $buf;
    while(my $l = read($fh, $buf, 1024)) {
	    $md5->add( $UTF8 ? Encode::encode_utf8($buf) : $buf );
    }
    return $md5->hexdigest;
}

sub file_md5_base64 {
    my ($file,$bn,$ut)   = @_;
    local $BINMODE = $bn if defined $bn;
    local $UTF8    = $ut if defined $ut;
    my $fh         = $getfh->($file) or return;

my $md5 = Digest::MD5->new();
    my $buf;
    while(my $l = read($fh, $buf, 1024)) {
	    $md5->add( $UTF8 ? Encode::encode_utf8($buf) : $buf );
    }
    return $md5->b64digest;
}

sub url_md5 {
    my $cn      = $getur->(shift()) or return;
    my ($ut)    = shift;
    local $UTF8 = $ut if defined $ut;
    return Digest::MD5::md5($cn) if !$UTF8;
    return Digest::MD5::md5(Encode::encode_utf8($cn));
}

sub url_md5_hex {
    my $cn      = $getur->(shift()) or return;
    my ($ut)    = shift;
    local $UTF8 = $ut if defined $ut;
    return Digest::MD5::md5_hex($cn) if !$UTF8;
    return Digest::MD5::md5_hex(Encode::encode_utf8($cn));
}

sub url_md5_base64 { 
    my $cn      = $getur->(shift()) or return;
    my ($ut)    = shift;
    local $UTF8 = $ut if defined $ut;
    return Digest::MD5::md5_base64($cn) if !$UTF8;
    return Digest::MD5::md5_base64(Encode::encode_utf8($cn));
}

sub Digest::MD5::addpath {
    my $md5          = shift;
    my ($fl,$bn,$ut) = @_;
    local $BINMODE   = $bn if defined $bn;
    local $UTF8      = $ut if defined $ut;
    if(ref $fl eq 'ARRAY') {
        for my $pth (@{ $fl }) {
            $md5->addpath($pth, $bn, $ut) or return;
        }
    } 
    else {
        my $fh = $getfh->($fl) or return;
        my $buf;
        while(my $l = read($fh, $buf, 1024)) {
           !$UTF8 ? $md5->add($buf) : $md5->add(Encode::encode_utf8($buf));
        }
    }
    return 1;
}

sub Digest::MD5::addurl {
    my $md5     = shift;
    my $cn      = $getur->(shift()) or return;
    my $ut      = shift;
    local $UTF8 = $ut if defined $ut;
    !$UTF8 ? $md5->add($cn) : $md5->add(Encode::encode_utf8($cn));
}

__END__

=head1 NAME

Digest::MD5::File - Perl extension for getting MD5 sums for files and urls.

=head1 SYNOPSIS

use Digest::MD5::File qw(dir_md5_hex file_md5_hex url_md5_hex);

my $md5 = Digest::MD5->new;
    $md5->addpath('/path/to/file');
    my $digest = $md5->hexdigest;

my $digest = file_md5($file);
    my $digest = file_md5_hex($file);
    my $digest = file_md5_base64($file);

my $md5 = Digest::MD5->new;
    $md5->addurl('http://www.tmbg.com/tour.html');
    my $digest = $md5->hexdigest;

my $digest = url_md5($url);
    my $digest = url_md5_hex($url);
    my $digest = url_md5_base64($url);
  
    my $md5 = Digest::MD5->new;
    $md5->adddir('/directory');
    my $digest = $md5->hexdigest;

my $dir_hashref = dir_md5($dir);    
    my $dir_hashref = dir_md5_hex($dir);    
    my $dir_hashref = dir_md5_base64($dir);

=head1 DESCRIPTION

Get MD5 sums for files of a given path or content of a given url.

=head1 EXPORT

None by default.
You can export any file_* dir_*, or url_* function and anything L<Digest::MD5> can export.

use Digest::MD5::File qw(md5 md5_hex md5_base64); # 3 Digest::MD5 functions
   print md5_hex('abc123'), "\n";
   print md5_base64('abc123'), "\n";

=head1 OBJECT METHODS

=head2 addpath()

my $md5 = Digest::MD5->new;
    $md5->addpath('/path/to/file.txt') 
        or die "file.txt is not where you said: $!";

or you can add multiple files by specifying an array ref of files:

$md5->addpath(\@files);

=head2 adddir()
 
addpath()s each file in a directory recursively. Follows the same rules as the dir_* functions.

my $md5 = Digest::MD5->new;
    $md5->adddir('/home/tmbg/') 
        or die "See warning above to see why I bailed: $!";

=head2 addurl()

my $md5 = Digest::MD5->new;
    $md5->addurl('http://www.tmbg.com/tour.html')
        or die "They Must Be not on tour";

=head1 file_* functions

Get the digest in variouse formats of $file.
If file does not exist or is a directory it croaks (See NOFATALS for more info)

my $digest = file_md5($file) or warn "$file failed: $!";
    my $digest = file_md5_hex($file) or warn "$file failed: $!";
    my $digest = file_md5_base64($file) or warn "$file failed: $!";

=head1 dir_* functions

Returns a hashref whose keys are files relative to the given path and the values are the MD5 sum of the file or and empty string if a directory.
It recurses through the entire depth of the directory.
Symlinks to files are just addpath()d and symlinks to directories are followed.

my $dir_hashref = dir_md5($dir) or warn "$dir failed: $!";
    my $dir_hashref = dir_md5_hex($dir) or warn "$dir failed: $!";
    my $dir_hashref = dir_md5_base64($dir) or warn "$dir failed: $!";

=head1 url_* functions

Get the digest in various formats of the content at $url (Including, if $url points to directory, the directory listing content).
Returns undef if url fails (IE if L<LWP::UserAgent>'s $res->is_success is false)

my $digest = url_md5($url) or warn "$url failed"; 
    my $digest = url_md5_hex($url) or warn "$url failed";
    my $digest = url_md5_base64($url) or warn "$url failed";

=head1 SPECIAL SETTINGS

=head2 BINMODE

By default files are opened in binmode. If you do not want to do this you can unset it a variety of ways:

use Digest::MD5::File qw(-nobin);

$Digest::MD5::File::BINMODE = 0;

or at the function/method level by specifying its value as the second argument:

$md5->addpath($file,0);

my $digest = file_md5_hex($file,0);

=head2 UTF8

In some cases you may want to have your data utf8 encoded, you can do this the following ways:

use Digest::MD5::File qw(-utf8);

$Digest::MD5::File::UTF8 = 1;

or at the function/method level by specifying its value as the third argument for files and second for urls:

$md5->addpath($file,$binmode,1);

my $digest = file_md5_hex($file,$binmode,1);

$md5->addurl($url,1);

url_md5_hex($url,1);

It use's L<Encode>'s encode_utf8() function to do the encoding. So if you do not have Encode (pre 5.7.3) this won't work :)

=head2 NOFATALS

Instead of croaking it will return undef if you set NOFATALS to true.

You can do this two ways:

$Digest::MD5::File::NOFATALS = 1;

or the -nofatals flag:

use Digest::MD5::File qw(-nofatals);

my $digest = file_md5_hex($file) or die "$file failed";

$! is not set so its not really helpful if you die().

=head1 SEE ALSO

L<Digest::MD5>, L<Encode>, L<LWP::UserAgent>

=head1 AUTHOR

Daniel Muey, L<http://drmuey.com/cpan_contact.pl>

=head1 COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

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