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shared_config.rb
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shared_config.rb
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module Aws
# @api private
class SharedConfig
# @return [String]
attr_reader :credentials_path
# @return [String]
attr_reader :config_path
# @return [String]
attr_reader :profile_name
# Constructs a new SharedConfig provider object. This will load the shared
# credentials file, and optionally the shared configuration file, as ini
# files which support profiles.
#
# By default, the shared credential file (the default path for which is
# `~/.aws/credentials`) and the shared config file (the default path for
# which is `~/.aws/config`) are loaded. However, if you set the
# `ENV['AWS_SDK_CONFIG_OPT_OUT']` environment variable, only the shared
# credential file will be loaded.
#
# The default profile name is 'default'. You can specify the profile name
# with the `ENV['AWS_PROFILE']` environment variable or with the
# `:profile_name` option.
#
# @param [Hash] options
# @option options [String] :credentials_path Path to the shared credentials
# file. Defaults to "#{Dir.home}/.aws/credentials".
# @option options [String] :config_path Path to the shared config file.
# Defaults to "#{Dir.home}/.aws/config".
# @option options [String] :profile_name The credential/config profile name
# to use. If not specified, will check `ENV['AWS_PROFILE']` before using
# the fixed default value of 'default'.
# @option options [Boolean] :config_enabled If true, loads the shared config
# file and enables new config values outside of the old shared credential
# spec.
def initialize(options = {})
@profile_name = determine_profile(options)
@config_enabled = options[:config_enabled]
@credentials_path = options[:credentials_path] ||
determine_credentials_path
@parsed_credentials = {}
load_credentials_file if loadable?(@credentials_path)
if @config_enabled
@config_path = options[:config_path] || determine_config_path
load_config_file if loadable?(@config_path)
end
end
# @api private
def fresh(options = {})
@profile_name = nil
@credentials_path = nil
@config_path = nil
@parsed_credentials = {}
@parsed_config = nil
@config_enabled = options[:config_enabled] ? true : false
@profile_name = determine_profile(options)
@credentials_path = options[:credentials_path] ||
determine_credentials_path
load_credentials_file if loadable?(@credentials_path)
if @config_enabled
@config_path = options[:config_path] || determine_config_path
load_config_file if loadable?(@config_path)
end
end
# @return [Boolean] Returns `true` if a credential file
# exists and has appropriate read permissions at {#path}.
# @note This method does not indicate if the file found at {#path}
# will be parsable, only if it can be read.
def loadable?(path)
!path.nil? && File.exist?(path) && File.readable?(path)
end
# @return [Boolean] returns `true` if use of the shared config file is
# enabled.
def config_enabled?
@config_enabled ? true : false
end
# Sources static credentials from shared credential/config files.
#
# @param [Hash] options
# @option options [String] :profile the name of the configuration file from
# which credentials are being sourced.
# @return [Aws::Credentials] credentials sourced from configuration values,
# or `nil` if no valid credentials were found.
def credentials(opts = {})
p = opts[:profile] || @profile_name
validate_profile_exists(p) if credentials_present?
if credentials = credentials_from_shared(p, opts)
credentials
elsif credentials = credentials_from_config(p, opts)
credentials
else
nil
end
end
# Attempts to assume a role from shared config or shared credentials file.
# Will always attempt first to assume a role from the shared credentials
# file, if present.
def assume_role_credentials_from_config(opts = {})
p = opts.delete(:profile) || @profile_name
credentials = assume_role_from_profile(@parsed_credentials, p, opts)
if @parsed_config
credentials ||= assume_role_from_profile(@parsed_config, p, opts)
end
credentials
end
def region(opts = {})
p = opts[:profile] || @profile_name
if @config_enabled
if @parsed_credentials
region = @parsed_credentials.fetch(p, {})["region"]
end
if @parsed_config
region ||= @parsed_config.fetch(p, {})["region"]
end
region
else
nil
end
end
def sts_regional_endpoints(opts = {})
p = opts[:profile] || @profile_name
if @config_enabled
if @parsed_credentials
mode = @parsed_credentials.fetch(p, {})["sts_regional_endpoints"]
end
if @parsed_config
mode ||= @parsed_config.fetch(p, {})["sts_regional_endpoints"]
end
mode
else
nil
end
end
def endpoint_discovery(opts = {})
p = opts[:profile] || @profile_name
if @config_enabled && @parsed_config
@parsed_config.fetch(p, {})["endpoint_discovery_enabled"]
end
end
private
def credentials_present?
(@parsed_credentials && !@parsed_credentials.empty?) ||
(@parsed_config && !@parsed_config.empty?)
end
def assume_role_from_profile(cfg, profile, opts)
if cfg && prof_cfg = cfg[profile]
opts[:source_profile] ||= prof_cfg["source_profile"]
if opts[:source_profile]
opts[:credentials] = credentials(profile: opts[:source_profile])
if opts[:credentials]
opts[:role_session_name] ||= prof_cfg["role_session_name"]
opts[:role_session_name] ||= "default_session"
opts[:role_arn] ||= prof_cfg["role_arn"]
opts[:external_id] ||= prof_cfg["external_id"]
opts[:serial_number] ||= prof_cfg["mfa_serial"]
opts[:profile] = opts.delete(:source_profile)
AssumeRoleCredentials.new(opts)
else
raise Errors::NoSourceProfileError.new(
"Profile #{profile} has a role_arn, and source_profile, but the"\
" source_profile does not have credentials."
)
end
elsif prof_cfg["role_arn"]
raise Errors::NoSourceProfileError.new(
"Profile #{profile} has a role_arn, but no source_profile."
)
else
nil
end
else
nil
end
end
def credentials_from_shared(profile, opts)
if @parsed_credentials && prof_config = @parsed_credentials[profile]
credentials_from_profile(prof_config)
else
nil
end
end
def credentials_from_config(profile, opts)
if @parsed_config && prof_config = @parsed_config[profile]
credentials_from_profile(prof_config)
else
nil
end
end
def credentials_from_profile(prof_config)
creds = Credentials.new(
prof_config['aws_access_key_id'],
prof_config['aws_secret_access_key'],
prof_config['aws_session_token']
)
if credentials_complete(creds)
creds
else
nil
end
end
def credentials_complete(creds)
creds.set?
end
def load_credentials_file
@parsed_credentials = IniParser.ini_parse(
File.read(@credentials_path)
)
end
def load_config_file
@parsed_config = IniParser.ini_parse(File.read(@config_path))
end
def determine_credentials_path
default = default_shared_config_path('credentials')
end
def determine_config_path
default = default_shared_config_path('config')
end
def default_shared_config_path(file)
File.join(Dir.home, '.aws', file)
rescue ArgumentError
# Dir.home raises ArgumentError when ENV['home'] is not set
nil
end
def validate_profile_exists(profile)
unless (@parsed_credentials && @parsed_credentials[profile]) ||
(@parsed_config && @parsed_config[profile])
msg = "Profile `#{profile}' not found in #{@credentials_path}"
msg << " or #{@config_path}" if @config_path
raise Errors::NoSuchProfileError.new(msg)
end
end
def determine_profile(options)
ret = options[:profile_name]
ret ||= ENV["AWS_PROFILE"]
ret ||= "default"
ret
end
end
end