Provided by: libamazon-s3-perl_0.65-1_all 
NAME
Amazon::S3 - A portable client library for working with and managing Amazon S3 buckets and keys.
SYNOPSIS
use Amazon::S3;
my $aws_access_key_id = "Fill me in!";
my $aws_secret_access_key = "Fill me in too!";
my $s3 = Amazon::S3->new(
{ aws_access_key_id => $aws_access_key_id,
aws_secret_access_key => $aws_secret_access_key,
retry => 1
}
);
my $response = $s3->buckets;
# create a bucket
my $bucket_name = $aws_access_key_id . '-net-amazon-s3-test';
my $bucket = $s3->add_bucket( { bucket => $bucket_name } )
or die $s3->err . ": " . $s3->errstr;
# store a key with a content-type and some optional metadata
my $keyname = 'testing.txt';
my $value = 'T';
$bucket->add_key(
$keyname, $value,
{ content_type => 'text/plain',
'x-amz-meta-colour' => 'orange',
}
);
# copy an object
$bucket->copy_object(
source => $source,
key => $new_keyname
);
# list keys in the bucket
$response = $bucket->list
or die $s3->err . ": " . $s3->errstr;
print $response->{bucket}."\n";
for my $key (@{ $response->{keys} }) {
print "\t".$key->{key}."\n";
}
# delete key from bucket
$bucket->delete_key($keyname);
# delete multiple keys from bucket
$bucket->delete_keys([$key1, $key2, $key3]);
# delete bucket
$bucket->delete_bucket;
DESCRIPTION
This documentation refers to version 0.65.
"Amazon::S3" provides a portable client interface to Amazon Simple Storage System (S3).
This module is rather dated, however with some help from a few contributors it has had some recent
updates. Recent changes include implementations of:
ListObjectsV2
CopyObject
DeleteObjects
Additionally, this module now implements Signature Version 4 signing, unit tests have been updated and
more documentation has been added or corrected. Credentials are encrypted if you have encryption modules
installed.
Comparison to Other Perl S3 Modules
Other implementations for accessing Amazon's S3 service include "Net::Amazon::S3" and the "Paws" project.
"Amazon::S3" ostensibly was intended to be a drop-in replacement for "Net:Amazon::S3" that "traded some
performance in return for portability". That statement is no longer accurate as "Amazon::S3" may have
changed the interface in ways that might break your applications if you are relying on compatibility with
"Net::Amazon::S3".
However, "Net::Amazon::S3" and "Paws::S3" today, are dependent on "Moose" which may in fact level the
playing field in terms of performance penalties that may have been introduced by recent updates to
"Amazon::S3". Changes to "Amazon::S3" include the use of more Perl modules in lieu of raw Perl code to
increase maintainability and stability as well as some refactoring. "Amazon::S3" also strives now to
adhere to best practices as much as possible.
"Paws::S3" may be a much more robust implementation of a Perl S3 interface, however this module may still
appeal to those that favor simplicity of the interface and a lower number of dependencies. Below is the
original description of the module.
Amazon S3 is storage for the Internet. It is designed to make web-scale computing easier for
developers. Amazon S3 provides a simple web services interface that can be used to store and
retrieve any amount of data, at any time, from anywhere on the web. It gives any developer
access to the same highly scalable, reliable, fast, inexpensive data storage infrastructure
that Amazon uses to run its own global network of web sites. The service aims to maximize
benefits of scale and to pass those benefits on to developers.
To sign up for an Amazon Web Services account, required to use this library and the S3 service,
please visit the Amazon Web Services web site at http://www.amazonaws.com/.
You will be billed accordingly by Amazon when you use this module and must be responsible for
these costs.
To learn more about Amazon's S3 service, please visit: http://s3.amazonaws.com/.
The need for this module arose from some work that needed to work with S3 and would be
distributed, installed and used on many various environments where compiled dependencies may
not be an option. Net::Amazon::S3 used XML::LibXML tying it to that specific and often
difficult to install option. In order to remove this potential barrier to entry, this module is
forked and then modified to use XML::SAX via XML::Simple.
LIMITATIONS AND DIFFERENCES WITH EARLIER VERSIONS
As noted, this module is no longer a drop-in replacement for "Net::Amazon::S3" and has limitations and
differences that may impact the use of this module in your applications. Additionally, one of the
original intents of this fork of "Net::Amazon::S3" was to reduce the number of dependencies and make it
easy to install. Recent changes to this module have introduced new dependencies in order to improve the
maintainability and provide additional features. Installing CPAN modules is never easy, especially when
the dependencies of the dependencies are impossible to control and include XS modules.
MINIMUM PERL
Technically, this module should run on versions 5.10 and above, however some of the dependencies may
require higher versions of "perl" or some lower versions of the dependencies due to conflicts with
other versions of dependencies...it's a crapshoot when dealing with older "perl" versions and CPAN
modules.
You may however, be able to build this module by installing older versions of those dependencies and
take your chances that those older versions provide enough working features to support "Amazon::S3".
It is likely they do...and this module has recently been tested on version 5.10.0 "perl" using some
older CPAN modules to resolve dependency issues.
To build this module on an earlier version of "perl" you may need to downgrade some modules. In
particular I have found this recipe to work for building and testing on 5.10.0.
In this order install:
HTML::HeadParser 2.14
LWP 6.13
Amazon::S3
...other versions may work...YMMV.
API Signing
Making calls to AWS APIs requires that the calls be signed. Amazon has added a new signing method
(Signature Version 4) to increase security around their APIs. This module no longer utilizes
Signature Version V2.
New regions after January 30, 2014 will only support Signature Version 4.
See "Signature Version V4" below for important details.
Signature Version 4
<https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html>
IMPORTANT NOTE:
Unlike Signature Version 2, Version 4 requires a regional parameter. This implies that you
need to supply the bucket's region when signing requests for any API call that involves a
specific bucket. Starting with version 0.55 of this module, "Amazon::S3::Bucket" provides
a new method ("region()") and accepts in the constructor a "region" parameter. If a
region is not supplied, the region for the bucket will be set to the region set in the
"account" object ("Amazon::S3") that you passed to the bucket's new constructor.
Alternatively, you can request that the bucket's new constructor determine the bucket's
region for you by calling the "get_location_constraint()" method.
When signing API calls, the region for the specific bucket will be used. For calls that
are not regional ("buckets()", e.g.) the default region ('us-east-1') will be used.
Signature Version 2
<https://docs.aws.amazon.com/AmazonS3/latest/userguide/RESTAuthentication.html>
New APIs
This module does not support some of the newer API method calls for S3 added after the initial
creation of this interface.
Multipart Upload Support
There are some recently added unit tests for multipart uploads that seem to indicate this feature is
working as expected. Please report any deviation from expected results if you are using those
methods.
For more information regarding multipart uploads visit the link below.
<https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateMultipartUpload.html>
METHODS AND SUBROUTINES
new
Create a new S3 client object. Takes some arguments:
credentials (optional)
Reference to a class (like "Amazon::Credentials") that can provide credentials via the methods:
get_aws_access_key_id()
get_aws_secret_access_key()
get_token()
If you do not provide a credential class you must provide the keys when you instantiate the object.
See below.
You are strongly encourage to use a class that provides getters. If you choose to provide your
credentials to this class then they will be stored in this object. If you dump the class you will
likely expose those credentials.
aws_access_key_id
Use your Access Key ID as the value of the AWSAccessKeyId parameter in requests you send to Amazon
Web Services (when required). Your Access Key ID identifies you as the party responsible for the
request.
aws_secret_access_key
Since your Access Key ID is not encrypted in requests to AWS, it could be discovered and used by
anyone. Services that are not free require you to provide additional information, a request
signature, to verify that a request containing your unique Access Key ID could only have come from
you.
DO NOT INCLUDE THIS IN SCRIPTS OR APPLICATIONS YOU DISTRIBUTE. YOU'LL BE SORRY.
Consider using a credential class as described above to provide credentials, otherwise this class
will store your credentials for signing the requests. If you dump this object to logs your
credentials could be discovered.
token
An optional temporary token that will be inserted in the request along with your access and secret
key. A token is used in conjunction with temporary credentials when your EC2 instance has assumed a
role and you've scraped the temporary credentials from
http://169.254.169.254/latest/meta-data/iam/security-credentials
secure
Set this to a true value if you want to use SSL-encrypted connections when connecting to S3. Starting
in version 0.49, the default is true.
default: true
timeout
Defines the time, in seconds, your script should wait or a response before bailing.
default: 30s
retry
Enables or disables the library to retry upon errors. This uses exponential backoff with retries
after 1, 2, 4, 8, 16, 32 seconds, as recommended by Amazon.
default: off
host
Defines the S3 host endpoint to use.
default: s3.amazonaws.com
Note that requests are made to domain buckets when possible. You can prevent that behavior if either
the bucket name does not conform to DNS bucket naming conventions or you preface the bucket name with
'/'.
If you set a region then the host name will be modified accordingly if it is an Amazon endpoint.
region
The AWS region you where your bucket is located.
default: us-east-1
buffer_size
The default buffer size when reading or writing files.
default: 4096
signer
Sets or retrieves the signer object. API calls must be signed using your AWS credentials. By default,
starting with version 0.54 the module will use Net::Amazon::Signature::V4 as the signer and instantiate a
signer object in the constructor. Note however, that signers need your credentials and they will get
stored by that class, making them susceptible to inadvertant exfiltration. You have a few options here:
1. Use your own signer.
You may have noticed that you can also provide your own credentials object forcing this module to
use your object for retrieving credentials. Likewise, you can use your own signer so that this
module's signer never sees or stores those credentials.
2. Pass the credentials object and set "cache_signer" to a false value.
If you pass a credentials object and set "cache_signer" to a false value, the module will use the
credentials object to retrieve credentials and create a new signer each time an API call is made
that requires signing. This prevents your credentials from being stored inside of the signer class.
Note that using your own credentials object that stores your credentials in plaintext is also going
to expose your credentials when someone dumps the class.
3. Pass credentials, set "cache_signer" to a false value.
Unfortunately, while this will prevent Net::Amazon::Signature::V4 from hanging on to your
credentials, you credentials will be stored in the "Amazon::S3" object.
Starting with version 0.55 of this module, if you have installed Crypt::CBC and Crypt::Blowfish,
your credentials will be encrypted using a random key created when the class is instantiated. While
this is more secure than leaving them in plaintext, if the key is discovered (the key however is not
stored in the object's hash) and the object is dumped, your encrypted credentials can be exposed.
4. Use very granular credentials for bucket access only.
Use credentials that only allow access to a bucket or portions of a bucket required for your
application. This will at least limit the blast radius of any potential security breach.
5. Do nothing...send the credentials, use the default signer.
In this case, both the "Amazon::S3" class and the Net::Amazon::Signature::V4 have your credentials.
Caveat Emptor.
See also Amazon::Credentials for more information about safely storing your credentials and
preventing exfiltration.
region
Sets the region for the API calls. This will also be the default when instantiating the bucket object
unless you pass the region parameter in the "bucket" method or use the "verify_region" flag that will
always verify the region of the bucket using the "get_location_constraint" method.
default: us-east-1
buckets
buckets([verify-region])
verify-region (optional)
"verify-region" is a boolean value that indicates if the bucket's region should be verified when the
bucket object is instantiated.
If set to true, this method will call the "bucket" method with "verify_region" set to true causing
the constructor to call the "get_location_constraint" for each bucket to set the bucket's region.
This will cause a significant decrease in the peformance of the "buckets()" method. Setting the
region for each bucket is necessary since API operations on buckets require the region of the bucket
when signing API requests. If all of your buckets are in the same region and you have passed a region
parameter to your S3 object, then that region will be used when calling the constructor of your
bucket objects.
default: false
Returns a reference to a hash containing the metadata for all of the buckets owned by the accout or (see
below) or "undef" on error.
owner_id
The owner ID of the bucket's owner.
owner_display_name
The name of the owner account.
buckets
An array of Amazon::S3::Bucket objects for the account. Returns "undef" if there are not buckets or
an error occurs.
add_bucket
add_bucket(bucket-configuration)
"bucket-configuration" is a reference to a hash with bucket configuration parameters.
bucket
The name of the bucket. See Bucket name rules
<https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucketnamingrules.html> for more details on
bucket naming rules.
acl_short (optional)
See the set_acl subroutine for documentation on the acl_short options
location_constraint
region
The region the bucket is to be created in.
Returns a Amazon::S3::Bucket object on success or "undef" on failure.
bucket
bucket(bucket, [region])
bucket({ bucket => bucket-name, verify_region => boolean, region => region });
Takes a scalar argument or refernce to a hash of arguments.
You can pass the region or set "verify_region" indicating that you want the bucket constructor to
detemine the bucket region.
If you do not pass the region or set the "verify_region" value, the region will be set to the default
region set in your "Amazon::S3" object.
See Amazon::S3::Bucket for a complete description of the "bucket" method.
delete_bucket
Takes either a Amazon::S3::Bucket object or a reference to a hash containing:
bucket
The name of the bucket to remove
region
Region the bucket is located in. If not provided, the method will determine the bucket's region by
calling "get_bucket_location".
Returns a boolean indicating the success or failure of the API call. Check "err" or "errstr" for error
messages.
Note from the Amazon's documentation
<https://docs.aws.amazon.com/AmazonS3/latest/userguide/BucketRestrictions.html>
If a bucket is empty, you can delete it. After a bucket is deleted, the name becomes available
for reuse. However, after you delete the bucket, you might not be able to reuse the name for
various reasons.
For example, when you delete the bucket and the name becomes available for reuse, another AWS
account might create a bucket with that name. In addition, some time might pass before you can
reuse the name of a deleted bucket. If you want to use the same bucket name, we recommend that
you don't delete the bucket.
dns_bucket_names
Set or get a boolean that indicates whether to use DNS bucket names.
default: true
list_bucket, list_bucket_v2
List all keys in this bucket.
Takes a reference to a hash of arguments:
bucket (required)
The name of the bucket you want to list keys on.
prefix
Restricts the response to only contain results that begin with the specified prefix. If you omit this
optional argument, the value of prefix for your query will be the empty string. In other words, the
results will be not be restricted by prefix.
delimiter
If this optional, Unicode string parameter is included with your request, then keys that contain the
same string between the prefix and the first occurrence of the delimiter will be rolled up into a
single result element in the CommonPrefixes collection. These rolled-up keys are not returned
elsewhere in the response. For example, with prefix="USA/" and delimiter="/", the matching keys
"USA/Oregon/Salem" and "USA/Oregon/Portland" would be summarized in the response as a single
"USA/Oregon" element in the CommonPrefixes collection. If an otherwise matching key does not contain
the delimiter after the prefix, it appears in the Contents collection.
Each element in the CommonPrefixes collection counts as one against the MaxKeys limit. The rolled-up
keys represented by each CommonPrefixes element do not. If the Delimiter parameter is not present in
your request, keys in the result set will not be rolled-up and neither the CommonPrefixes collection
nor the NextMarker element will be present in the response.
NOTE: CommonPrefixes isn't currently supported by Amazon::S3.
max-keys
This optional argument limits the number of results returned in response to your query. Amazon S3
will return no more than this number of results, but possibly less. Even if max-keys is not
specified, Amazon S3 will limit the number of results in the response. Check the IsTruncated flag to
see if your results are incomplete. If so, use the Marker parameter to request the next page of
results. For the purpose of counting max-keys, a 'result' is either a key in the 'Contents'
collection, or a delimited prefix in the 'CommonPrefixes' collection. So for delimiter requests, max-
keys limits the total number of list results, not just the number of keys.
marker
This optional parameter enables pagination of large result sets. "marker" specifies where in the
result set to resume listing. It restricts the response to only contain results that occur
alphabetically after the value of marker. To retrieve the next page of results, use the last key from
the current page of results as the marker in your next request.
See also "next_marker", below.
If "marker" is omitted,the first page of results is returned.
Returns "undef" on error and a reference to a hash of data on success:
The return value looks like this:
{
bucket => $bucket_name,
prefix => $bucket_prefix,
marker => $bucket_marker,
next_marker => $bucket_next_available_marker,
max_keys => $bucket_max_keys,
is_truncated => $bucket_is_truncated_boolean
keys => [$key1,$key2,...]
}
is_truncated
Boolean flag that indicates whether or not all results of your query were returned in this response.
If your results were truncated, you can make a follow-up paginated request using the Marker parameter
to retrieve the rest of the results.
next_marker
A convenience element, useful when paginating with delimiters. The value of "next_marker", if
present, is the largest (alphabetically) of all key names and all CommonPrefixes prefixes in the
response. If the "is_truncated" flag is set, request the next page of results by setting "marker" to
the value of "next_marker". This element is only present in the response if the "delimiter" parameter
was sent with the request.
Each key is a reference to a hash that looks like this:
{
key => $key,
last_modified => $last_mod_date,
etag => $etag, # An MD5 sum of the stored content.
size => $size, # Bytes
storage_class => $storage_class # Doc?
owner_id => $owner_id,
owner_displayname => $owner_name
}
get_bucket_location
get_bucket_location(bucket-name)
get_bucket_locaiton(bucket-obj)
This is a convenience routines for the "get_location_constraint()" of the bucket object. This method
will return the default region of 'us-east-1' when "get_location_constraint()" returns a null value.
my $region = $s3->get_bucket_location('my-bucket');
Starting with version 0.55, "Amazon::S3::Bucket" will call this "get_location_constraint()" to determine
the region for the bucket. You can get the region for the bucket by using the "region()" method of the
bucket object.
my $bucket = $s3->bucket('my-bucket');
my $bucket_region = $bucket->region;
get_logger
Returns the logger object. If you did not set a logger when you created the object then an instance of
"Amazon::S3::Logger" is returned. You can log to STDERR using this logger. For example:
$s3->get_logger->debug('this is a debug message');
$s3->get_logger->trace(sub { return Dumper([$response]) });
list_bucket_all, list_bucket_all_v2
List all keys in this bucket without having to worry about 'marker'. This is a convenience method, but
may make multiple requests to S3 under the hood.
Takes the same arguments as "list_bucket".
You are encouraged to use the newer "list_bucket_all_v2" method.
err
The S3 error code for the last error encountered.
errstr
A human readable error string for the last error encountered.
error
The decoded XML string as a hash object of the last error.
last_response
Returns the last HTTP::Response object.
last_request
Returns the last HTTP::Request object.
level
Set the logging level.
default: error
turn_on_special_retry
Called to add extra retry codes if retry has been set
turn_off_special_retry
Called to turn off special retry codes when we are deliberately triggering them
ABOUT
This module contains code modified from Amazon that contains the following notice:
# This software code is made available "AS IS" without warranties of any
# kind. You may copy, display, modify and redistribute the software
# code either by itself or as incorporated into your code; provided that
# you do not remove any proprietary notices. Your use of this software
# code is at your own risk and you waive any claim against Amazon
# Digital Services, Inc. or its affiliates with respect to your use of
# this software code. (c) 2006 Amazon Digital Services, Inc. or its
# affiliates.
TESTING
Testing S3 is a tricky thing. Amazon wants to charge you a bit of money each time you use their service.
And yes, testing counts as using. Because of this, the application's test suite skips anything
approaching a real test unless you set these environment variables:
For more on testing this module see README-TESTING.md <https://github.com/rlauer6/perl-amazon-
s3/blob/master/README-TESTING.md>
AMAZON_S3_EXPENSIVE_TESTS
Doesn't matter what you set it to. Just has to be set
AMAZON_S3_HOST
Sets the host to use for the API service.
default: s3.amazonaws.com
Note that if this value is set, DNS bucket name usage will be disabled for testing. Most likely, if
you set this variable, you are using a mocking service and your bucket names are probably not
resolvable. You can override this behavior by setting "AWS_S3_DNS_BUCKET_NAMES" to any value.
AWS_S3_DSN_BUCKET_NAMES
Set this to any value to override the default behavior of disabling DNS bucket names during testing.
AWS_ACCESS_KEY_ID
Your AWS access key
AWS_SECRET_ACCESS_KEY
Your AWS sekkr1t passkey. Be forewarned that setting this environment variable on a shared system
might leak that information to another user. Be careful.
AMAZON_S3_SKIP_ACL_TESTS
Doesn't matter what you set it to. Just has to be set if you want to skip ACLs tests.
AMAZON_S3_SKIP_PERMISSIONS
Skip tests that check for enforcement of ACLs...as of this version, LocalStack for example does not
support enforcement of ACLs.
AMAZON_S3_SKIP_REGION_CONSTRAINT_TEST
Doesn't matter what you set it to. Just has to be set if you want to skip region constraint test.
AMAZON_S3_MINIO
Doesn't matter what you set it to. Just has to be set if you want to skip tests that would fail on
minio.
AMAZON_S3_LOCALSTACK
Doesn't matter what you set it to. Just has to be set if you want to skip tests that would fail on
LocalStack.
AMAZON_S3_REGIONS
A comma delimited list of regions to use for testing. The default will only test creating a bucket in
the local region.
Consider using an S3 mocking service like "minio" or "LocalStack" if you want to create real tests for
your applications or this module.
Here's bash script for testing using LocalStack
#!/bin/bash
# -*- mode: sh; -*-
BUCKET=net-amazon-s3-test-test
ENDPOINT_URL=s3.localhost.localstack.cloud:4566
AMAZON_S3_EXPENSIVE_TESTS=1 \
AMAZON_S3_HOST=$ENDPOINT_URL \
AMAZON_S3_LOCALSTACK=1 \
AWS_ACCESS_KEY_ID=test \
AWS_ACCESS_SECRET_KEY=test \
AMAZON_S3_DOMAIN_BUCKET_NAMES=1 make test 2>&1 | tee test.log
To run the tests...clone the project and build the software.
cd src/main/perl
./test.localstack
ADDITIONAL INFORMATION
LOGGING AND DEBUGGING
Additional debugging information can be output to STDERR by setting the "level" option when you
instantiate the "Amazon::S3" object. Levels are represented as a string. The valid levels are:
fatal
error
warn
info
debug
trace
You can set an optionally pass in a logger that implements a subset of the "Log::Log4perl" interface.
Your logger should support at least these method calls. If you do not supply a logger the default logger
("Amazon::S3::Logger") will be used.
get_logger()
fatal()
error()
warn()
info()
debug()
trace()
level()
At the "trace" level, every HTTP request and response will be output to STDERR. At the "debug" level
information regarding the higher level methods will be output to STDERR. There currently is no
additional information logged at lower levels.
S3 LINKS OF INTEREST
Bucket restrictions and limitations
<https://docs.aws.amazon.com/AmazonS3/latest/userguide/BucketRestrictions.html>
Bucket naming rules <https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucketnamingrules.html>
Amazon S3 REST API <https://docs.aws.amazon.com/AmazonS3/latest/API/Welcome.html>
Authenticating Requests (AWS Signature Version 4) <https://docs.aws.amazon.com/AmazonS3/latest/API/sig-
v4-authenticating-requests.html>
Authenticating Requests (AWS Signature Version 2)
<https://docs.aws.amazon.com/AmazonS3/latest/userguide/RESTAuthentication.html>
LocalStack <https://localstack.io>
SUPPORT
Bugs should be reported via the CPAN bug tracker at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Amazon-S3>
For other issues, contact the author.
REPOSITORY
<https://github.com/rlauer6/perl-amazon-s3>
AUTHOR
Original author: Timothy Appnel <tima@cpan.org>
Current maintainer: Rob Lauer <bigfoot@cpan.org>
SEE ALSO
Amazon::S3::Bucket, Net::Amazon::S3
COPYRIGHT AND LICENCE
This module was initially based on Net::Amazon::S3 0.41, by Leon Brocard. Net::Amazon::S3 was based on
example code from Amazon with this notice:
This software code is made available "AS IS" without warranties of any kind. You may copy, display,
modify and redistribute the software code either by itself or as incorporated into your code; provided
that you do not remove any proprietary notices. Your use of this software code is at your own risk and
you waive any claim against Amazon Digital Services, Inc. or its affiliates with respect to your use of
this software code. (c) 2006 Amazon Digital Services, Inc. or its affiliates.
The software is released under the Artistic License. The terms of the Artistic License are described at
http://www.perl.com/language/misc/Artistic.html. Except where otherwise noted, "Amazon::S3" is Copyright
2008, Timothy Appnel, tima@cpan.org. All rights reserved.
perl v5.36.0 2023-11-30 Amazon::S3(3pm)