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Object.pm
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Object.pm
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package Net::Amazon::S3::Client::Object;
use Moose;
use MooseX::StrictConstructor;
use DateTime::Format::HTTP;
use Digest::MD5 qw(md5 md5_hex);
use Digest::MD5::File qw(file_md5 file_md5_hex);
use File::stat;
use MIME::Base64;
use Moose::Util::TypeConstraints;
use MooseX::Types::DateTimeX qw( DateTime );
enum 'AclShort' =>
qw(private public-read public-read-write authenticated-read);
has 'client' =>
( is => 'ro', isa => 'Net::Amazon::S3::Client', required => 1 );
has 'bucket' =>
( is => 'ro', isa => 'Net::Amazon::S3::Client::Bucket', required => 1 );
has 'key' => ( is => 'ro', isa => 'Str', required => 1 );
has 'etag' => ( is => 'ro', isa => 'Etag', required => 0 );
has 'size' => ( is => 'ro', isa => 'Int', required => 0 );
has 'last_modified' =>
( is => 'ro', isa => DateTime, coerce => 1, required => 0 );
has 'expires' => ( is => 'rw', isa => DateTime, coerce => 1, required => 0 );
has 'acl_short' =>
( is => 'ro', isa => 'AclShort', required => 0, default => 'private' );
has 'content_type' => (
is => 'ro',
isa => 'Str',
required => 0,
default => 'binary/octet-stream'
);
has 'content_encoding' => (
is => 'ro',
isa => 'Str',
required => 0,
);
__PACKAGE__->meta->make_immutable;
sub exists {
my $self = shift;
my $http_request = Net::Amazon::S3::Request::GetObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
method => 'HEAD',
)->http_request;
my $http_response = $self->client->_send_request_raw($http_request);
return $http_response->code == 200 ? 1 : 0;
}
sub get {
my $self = shift;
my $http_request = Net::Amazon::S3::Request::GetObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
method => 'GET',
)->http_request;
my $http_response = $self->client->_send_request($http_request);
my $content = $http_response->content;
my $md5_hex = md5_hex($content);
if ( $self->etag ) {
confess 'Corrupted download' if $self->etag ne $md5_hex;
} else {
confess 'Corrupted download'
if $self->_etag($http_response) ne $md5_hex;
}
return $content;
}
sub get_filename {
my ( $self, $filename ) = @_;
my $http_request = Net::Amazon::S3::Request::GetObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
method => 'GET',
)->http_request;
my $http_response
= $self->client->_send_request( $http_request, $filename );
my $md5_hex = file_md5_hex($filename);
if ( $self->etag ) {
confess 'Corrupted download' if $self->etag ne $md5_hex;
} else {
confess 'Corrupted download'
if $self->_etag($http_response) ne $md5_hex;
}
}
sub put {
my ( $self, $value ) = @_;
my $md5 = md5($value);
my $md5_hex = unpack( 'H*', $md5 );
my $md5_base64 = encode_base64($md5);
chomp $md5_base64;
my $conf = {
'Content-MD5' => $md5_base64,
'Content-Length' => length $value,
'Content-Type' => $self->content_type,
};
if ( $self->expires ) {
$conf->{Expires}
= DateTime::Format::HTTP->format_datetime( $self->expires );
}
if ( $self->content_encoding ) {
$conf->{'Content-Encoding'} = $self->content_encoding;
}
my $http_request = Net::Amazon::S3::Request::PutObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
value => $value,
headers => $conf,
acl_short => $self->acl_short,
)->http_request;
my $http_response = $self->client->_send_request($http_request);
confess 'Error uploading' if $http_response->code != 200;
my $etag = $self->_etag($http_response);
confess 'Corrupted upload' if $etag ne $md5_hex;
}
sub put_filename {
my ( $self, $filename ) = @_;
my $md5_hex = $self->etag || file_md5_hex($filename);
my $size = $self->size;
unless ($size) {
my $stat = stat($filename) || confess("No $filename: $!");
$size = $stat->size;
}
my $md5 = pack( 'H*', $md5_hex );
my $md5_base64 = encode_base64($md5);
chomp $md5_base64;
my $conf = {
'Content-MD5' => $md5_base64,
'Content-Length' => $size,
'Content-Type' => $self->content_type,
};
if ( $self->expires ) {
$conf->{Expires}
= DateTime::Format::HTTP->format_datetime( $self->expires );
}
if ( $self->content_encoding ) {
$conf->{'Content-Encoding'} = $self->content_encoding;
}
my $http_request = Net::Amazon::S3::Request::PutObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
value => $self->_content_sub($filename),
headers => $conf,
acl_short => $self->acl_short,
)->http_request;
my $http_response = $self->client->_send_request($http_request);
confess 'Error uploading' . $http_response->as_string
if $http_response->code != 200;
confess 'Corrupted upload' if $self->_etag($http_response) ne $md5_hex;
}
sub delete {
my $self = shift;
my $http_request = Net::Amazon::S3::Request::DeleteObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
)->http_request;
$self->client->_send_request($http_request);
}
sub uri {
my $self = shift;
return Net::Amazon::S3::Request::GetObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
method => 'GET',
)->http_request->uri;
}
sub query_string_authentication_uri {
my $self = shift;
return Net::Amazon::S3::Request::GetObject->new(
s3 => $self->client->s3,
bucket => $self->bucket->name,
key => $self->key,
method => 'GET',
)->query_string_authentication_uri( $self->expires->epoch );
}
sub _content_sub {
my $self = shift;
my $filename = shift;
my $stat = stat($filename);
my $remaining = $stat->size;
my $blksize = $stat->blksize || 4096;
confess "$filename not a readable file with fixed size"
unless -r $filename and ( -f _ || $remaining );
my $fh = IO::File->new( $filename, 'r' )
or confess "Could not open $filename: $!";
$fh->binmode;
return sub {
my $buffer;
# upon retries the file is closed and we must reopen it
unless ( $fh->opened ) {
$fh = IO::File->new( $filename, 'r' )
or confess "Could not open $filename: $!";
$fh->binmode;
$remaining = $stat->size;
}
# warn "read remaining $remaining";
unless ( my $read = $fh->read( $buffer, $blksize ) ) {
# warn "read $read buffer $buffer remaining $remaining";
confess
"Error while reading upload content $filename ($remaining remaining) $!"
if $! and $remaining;
# otherwise, we found EOF
$fh->close
or confess "close of upload content $filename failed: $!";
$buffer ||= ''
; # LWP expects an emptry string on finish, read returns 0
}
$remaining -= length($buffer);
return $buffer;
};
}
sub _etag {
my ( $self, $http_response ) = @_;
my $etag = $http_response->header('ETag');
if ($etag) {
$etag =~ s/^"//;
$etag =~ s/"$//;
}
return $etag;
}
1;
__END__
=head1 NAME
Net::Amazon::S3::Client::Object - An easy-to-use Amazon S3 client object
=head1 SYNOPSIS
# show the key
print $object->key . "\n";
# show the etag of an existing object (if fetched by listing
# a bucket)
print $object->etag . "\n";
# show the size of an existing object (if fetched by listing
# a bucket)
print $object->size . "\n";
# to create a new object
my $object = $bucket->object( key => 'this is the key' );
$object->put('this is the value');
# to get the vaue of an object
my $value = $object->get;
# to see if an object exists
if ($object->exists) { ... }
# to delete an object
$object->delete;
# to create a new object which is publically-accessible with a
# content-type of text/plain which expires on 2010-01-02
my $object = $bucket->object(
key => 'this is the public key',
acl_short => 'public-read',
content_type => 'text/plain',
expires => '2010-01-02',
);
$object->put('this is the public value');
# return the URI of a publically-accessible object
my $uri = $object->uri;
# upload a file
my $object = $bucket->object(
key => 'images/my_hat.jpg',
content_type => 'image/jpeg',
);
$object->put_filename('hat.jpg');
# upload a file if you already know its md5_hex and size
my $object = $bucket->object(
key => 'images/my_hat.jpg',
content_type => 'image/jpeg',
etag => $md5_hex,
size => $size,
);
$object->put_filename('hat.jpg');
# download the value of the object into a file
my $object = $bucket->object( key => 'images/my_hat.jpg' );
$object->get_filename('hat_backup.jpg');
# use query string authentication
my $object = $bucket->object(
key => 'images/my_hat.jpg',
expires => '2009-03-01',
);
my $uri = $object->query_string_authentication_uri();
=head1 DESCRIPTION
This module represents objects in buckets.
=head1 METHODS
=head2 etag
# show the etag of an existing object (if fetched by listing
# a bucket)
print $object->etag . "\n";
=head2 delete
# to delete an object
$object->delete;
=head2 exists
# to see if an object exists
if ($object->exists) { ... }
=head2 get
# to get the vaue of an object
my $value = $object->get;
=head2 get_filename
# download the value of the object into a file
my $object = $bucket->object( key => 'images/my_hat.jpg' );
$object->get_filename('hat_backup.jpg');
=head2 key
# show the key
print $object->key . "\n";
=head2 put
# to create a new object
my $object = $bucket->object( key => 'this is the key' );
$object->put('this is the value');
# to create a new object which is publically-accessible with a
# content-type of text/plain
my $object = $bucket->object(
key => 'this is the public key',
acl_short => 'public-read',
content_type => 'text/plain',
);
$object->put('this is the public value');
You may also set Content-Encoding using content_encoding.
=head2 put_filename
# upload a file
my $object = $bucket->object(
key => 'images/my_hat.jpg',
content_type => 'image/jpeg',
);
$object->put_filename('hat.jpg');
# upload a file if you already know its md5_hex and size
my $object = $bucket->object(
key => 'images/my_hat.jpg',
content_type => 'image/jpeg',
etag => $md5_hex,
size => $size,
);
$object->put_filename('hat.jpg');
You may also set Content-Encoding using content_encoding.
=head2 query_string_authentication_uri
# use query string authentication
my $object = $bucket->object(
key => 'images/my_hat.jpg',
expires => '2009-03-01',
);
my $uri = $object->query_string_authentication_uri();
=head2 size
# show the size of an existing object (if fetched by listing
# a bucket)
print $object->size . "\n";
=head2 uri
# return the URI of a publically-accessible object
my $uri = $object->uri;