NAME

Config::AWS - Parse AWS config files

SYNOPSIS

use Config::AWS ':all';

# Read the data for a specific profile
$config = read( $source, $profile );

# Or read the default profile from the default file
$config = read();

# Which is the same as
$config = read(
    -r credentials_file() ? credentials_file() : config_file(),
    default_profile()
);

# Read all of the profiles from a file
$profiles = read_all( $source );

# Or if you have cycles to burn
$profiles = {
    map { $_ => read( $source, $_ ) } list_profiles( $source )
};

DESCRIPTION

Config::AWS is a small distribution with generic methods to correctly parse the contents of config files for the AWS CLI client as described in the AWS documentation.

Although it is common to see these files parsed as standard INI files, this is not appropriate since AWS config files have an idiosyncratic format for nested values (as shown in the link above).

Standard INI parsers (like Config::INI) are not made to parse this sort of structure (nor should they). So Config::AWS exists to provide a suitable and lightweight ad-hoc parser that can be used in other applications.

ROUTINES

Config::AWS does not export anything by default. All the functions described in this document can be requested by name at the time of import. Alternatively, the :all tag can be used to import all of them into your namespace in one go. Other tags are explained in the sections below.

Parsing routines

These are the prefered methods for parsing AWS config data. These can be imported with the :read tag.

read

read_all

list_profiles

$profiles = read_all();                       # Use defaults
$profiles = read_all( $source );              # Specify source

@profile_names = list_profiles();             # Use default file
@profile_names = list_profiles( $source );    # Specify source

$profile = read();                            # Use defaults
$profile = read( $source );                   # Use default profile
$profile = read( $source, $profile );         # Specify source and profile
$profile = read( undef,   $profile );         # Use default file

Parse AWS config data. All these functions take the data source to use as their first argument. The source can be any of the following:

• A string with the path to the file

• A Path::Tiny object for the config file

• An array reference of lines to parse

• A scalar reference with the entire slurped contents of the file

• An undefined value

If the source is undefined, a default file name will be used. This will be the result of calling credentials_file (if it is a readable file) or the result of calling config_file otherwise.

read_all will return the results of parsing all of the content in the source, for all profiles that may be defined in it.

read will instead return the data for a single profile only. This profile can be specified as the second argument. If no profile is provided, read will use the result of calling default_profile as the default.

list_profiles will return only the names of the profiles specified in the config as a list. The order will be the same as that used in the source.

AWS defaults

These routines provide information about the default values, as understood by the AWS CLI interface. These can be imported with the :aws tag.

default_profile

Returns the contents of the AWS_DEFAULT_PROFILE environment variable, or default if undefined.

config_file

Returns the contents of the AWS_CONFIG_FILE environment variable, or ~/.aws/config if undefined.

credentials_file

Returns the contents of the AWS_SHARED_CREDENTIALS_FILE environment variable, or ~/.aws/credentials if undefined.

Compatibility with Config::INI

This module includes routines that allow it to be used as a drop-in replacement of Config::INI. The read_file, read_string, and read_handle functions behave like those described in the documentation for that distribution. They can be imported with the :ini tag.

Unlike the functions described above, they do not use the default values for AWS config files or profiles, and require the source to be explicitly stated.

To more closely mimic the behaviour of the methods they emulate, they return the entire parsed config data. As a concesion, an optional profile can be specified as a second argument, in which case only the data for that profile will be returned.

CONTRIBUTIONS AND BUG REPORTS

Contributions of any kind are most welcome!

The main repository for this distribution is on GitLab, which is where patches and bug reports are mainly tracked.

Bug reports can also be sent through the CPAN RT system, or by mail directly to the developers at the address below, although these might not be as closely tracked.

AUTHOR

• José Joaquín Atria <jjatria@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2018 by José Joaquín Atria.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.