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session.go
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session.go
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package session
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/aws/corehandlers"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/csm"
"github.com/aws/aws-sdk-go/aws/defaults"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/request"
)
const (
// ErrCodeSharedConfig represents an error that occurs in the shared
// configuration logic
ErrCodeSharedConfig = "SharedConfigErr"
// ErrCodeLoadCustomCABundle error code for unable to load custom CA bundle.
ErrCodeLoadCustomCABundle = "LoadCustomCABundleError"
// ErrCodeLoadClientTLSCert error code for unable to load client TLS
// certificate or key
ErrCodeLoadClientTLSCert = "LoadClientTLSCertError"
)
// ErrSharedConfigSourceCollision will be returned if a section contains both
// source_profile and credential_source
var ErrSharedConfigSourceCollision = awserr.New(ErrCodeSharedConfig, "only source profile or credential source can be specified, not both", nil)
// ErrSharedConfigECSContainerEnvVarEmpty will be returned if the environment
// variables are empty and Environment was set as the credential source
var ErrSharedConfigECSContainerEnvVarEmpty = awserr.New(ErrCodeSharedConfig, "EcsContainer was specified as the credential_source, but 'AWS_CONTAINER_CREDENTIALS_RELATIVE_URI' was not set", nil)
// ErrSharedConfigInvalidCredSource will be returned if an invalid credential source was provided
var ErrSharedConfigInvalidCredSource = awserr.New(ErrCodeSharedConfig, "credential source values must be EcsContainer, Ec2InstanceMetadata, or Environment", nil)
// A Session provides a central location to create service clients from and
// store configurations and request handlers for those services.
//
// Sessions are safe to create service clients concurrently, but it is not safe
// to mutate the Session concurrently.
//
// The Session satisfies the service client's client.ConfigProvider.
type Session struct {
Config *aws.Config
Handlers request.Handlers
options Options
}
// New creates a new instance of the handlers merging in the provided configs
// on top of the SDK's default configurations. Once the Session is created it
// can be mutated to modify the Config or Handlers. The Session is safe to be
// read concurrently, but it should not be written to concurrently.
//
// If the AWS_SDK_LOAD_CONFIG environment is set to a truthy value, the New
// method could now encounter an error when loading the configuration. When
// The environment variable is set, and an error occurs, New will return a
// session that will fail all requests reporting the error that occurred while
// loading the session. Use NewSession to get the error when creating the
// session.
//
// If the AWS_SDK_LOAD_CONFIG environment variable is set to a truthy value
// the shared config file (~/.aws/config) will also be loaded, in addition to
// the shared credentials file (~/.aws/credentials). Values set in both the
// shared config, and shared credentials will be taken from the shared
// credentials file.
//
// Deprecated: Use NewSession functions to create sessions instead. NewSession
// has the same functionality as New except an error can be returned when the
// func is called instead of waiting to receive an error until a request is made.
func New(cfgs ...*aws.Config) *Session {
// load initial config from environment
envCfg, envErr := loadEnvConfig()
if envCfg.EnableSharedConfig {
var cfg aws.Config
cfg.MergeIn(cfgs...)
s, err := NewSessionWithOptions(Options{
Config: cfg,
SharedConfigState: SharedConfigEnable,
})
if err != nil {
// Old session.New expected all errors to be discovered when
// a request is made, and would report the errors then. This
// needs to be replicated if an error occurs while creating
// the session.
msg := "failed to create session with AWS_SDK_LOAD_CONFIG enabled. " +
"Use session.NewSession to handle errors occurring during session creation."
// Session creation failed, need to report the error and prevent
// any requests from succeeding.
s = &Session{Config: defaults.Config()}
s.logDeprecatedNewSessionError(msg, err, cfgs)
}
return s
}
s := deprecatedNewSession(envCfg, cfgs...)
if envErr != nil {
msg := "failed to load env config"
s.logDeprecatedNewSessionError(msg, envErr, cfgs)
}
if csmCfg, err := loadCSMConfig(envCfg, []string{}); err != nil {
if l := s.Config.Logger; l != nil {
l.Log(fmt.Sprintf("ERROR: failed to load CSM configuration, %v", err))
}
} else if csmCfg.Enabled {
err := enableCSM(&s.Handlers, csmCfg, s.Config.Logger)
if err != nil {
msg := "failed to enable CSM"
s.logDeprecatedNewSessionError(msg, err, cfgs)
}
}
return s
}
// NewSession returns a new Session created from SDK defaults, config files,
// environment, and user provided config files. Once the Session is created
// it can be mutated to modify the Config or Handlers. The Session is safe to
// be read concurrently, but it should not be written to concurrently.
//
// If the AWS_SDK_LOAD_CONFIG environment variable is set to a truthy value
// the shared config file (~/.aws/config) will also be loaded in addition to
// the shared credentials file (~/.aws/credentials). Values set in both the
// shared config, and shared credentials will be taken from the shared
// credentials file. Enabling the Shared Config will also allow the Session
// to be built with retrieving credentials with AssumeRole set in the config.
//
// See the NewSessionWithOptions func for information on how to override or
// control through code how the Session will be created, such as specifying the
// config profile, and controlling if shared config is enabled or not.
func NewSession(cfgs ...*aws.Config) (*Session, error) {
opts := Options{}
opts.Config.MergeIn(cfgs...)
return NewSessionWithOptions(opts)
}
// SharedConfigState provides the ability to optionally override the state
// of the session's creation based on the shared config being enabled or
// disabled.
type SharedConfigState int
const (
// SharedConfigStateFromEnv does not override any state of the
// AWS_SDK_LOAD_CONFIG env var. It is the default value of the
// SharedConfigState type.
SharedConfigStateFromEnv SharedConfigState = iota
// SharedConfigDisable overrides the AWS_SDK_LOAD_CONFIG env var value
// and disables the shared config functionality.
SharedConfigDisable
// SharedConfigEnable overrides the AWS_SDK_LOAD_CONFIG env var value
// and enables the shared config functionality.
SharedConfigEnable
)
// Options provides the means to control how a Session is created and what
// configuration values will be loaded.
//
type Options struct {
// Provides config values for the SDK to use when creating service clients
// and making API requests to services. Any value set in with this field
// will override the associated value provided by the SDK defaults,
// environment or config files where relevant.
//
// If not set, configuration values from from SDK defaults, environment,
// config will be used.
Config aws.Config
// Overrides the config profile the Session should be created from. If not
// set the value of the environment variable will be loaded (AWS_PROFILE,
// or AWS_DEFAULT_PROFILE if the Shared Config is enabled).
//
// If not set and environment variables are not set the "default"
// (DefaultSharedConfigProfile) will be used as the profile to load the
// session config from.
Profile string
// Instructs how the Session will be created based on the AWS_SDK_LOAD_CONFIG
// environment variable. By default a Session will be created using the
// value provided by the AWS_SDK_LOAD_CONFIG environment variable.
//
// Setting this value to SharedConfigEnable or SharedConfigDisable
// will allow you to override the AWS_SDK_LOAD_CONFIG environment variable
// and enable or disable the shared config functionality.
SharedConfigState SharedConfigState
// Ordered list of files the session will load configuration from.
// It will override environment variable AWS_SHARED_CREDENTIALS_FILE, AWS_CONFIG_FILE.
SharedConfigFiles []string
// When the SDK's shared config is configured to assume a role with MFA
// this option is required in order to provide the mechanism that will
// retrieve the MFA token. There is no default value for this field. If
// it is not set an error will be returned when creating the session.
//
// This token provider will be called when ever the assumed role's
// credentials need to be refreshed. Within the context of service clients
// all sharing the same session the SDK will ensure calls to the token
// provider are atomic. When sharing a token provider across multiple
// sessions additional synchronization logic is needed to ensure the
// token providers do not introduce race conditions. It is recommend to
// share the session where possible.
//
// stscreds.StdinTokenProvider is a basic implementation that will prompt
// from stdin for the MFA token code.
//
// This field is only used if the shared configuration is enabled, and
// the config enables assume role wit MFA via the mfa_serial field.
AssumeRoleTokenProvider func() (string, error)
// When the SDK's shared config is configured to assume a role this option
// may be provided to set the expiry duration of the STS credentials.
// Defaults to 15 minutes if not set as documented in the
// stscreds.AssumeRoleProvider.
AssumeRoleDuration time.Duration
// Reader for a custom Credentials Authority (CA) bundle in PEM format that
// the SDK will use instead of the default system's root CA bundle. Use this
// only if you want to replace the CA bundle the SDK uses for TLS requests.
//
// HTTP Client's Transport concrete implementation must be a http.Transport
// or creating the session will fail.
//
// If the Transport's TLS config is set this option will cause the SDK
// to overwrite the Transport's TLS config's RootCAs value. If the CA
// bundle reader contains multiple certificates all of them will be loaded.
//
// Can also be specified via the environment variable:
//
// AWS_CA_BUNDLE=$HOME/ca_bundle
//
// Can also be specified via the shared config field:
//
// ca_bundle = $HOME/ca_bundle
CustomCABundle io.Reader
// Reader for the TLC client certificate that should be used by the SDK's
// HTTP transport when making requests. The certificate must be paired with
// a TLS client key file. Will be ignored if both are not provided.
//
// HTTP Client's Transport concrete implementation must be a http.Transport
// or creating the session will fail.
//
// Can also be specified via the environment variable:
//
// AWS_SDK_GO_CLIENT_TLS_CERT=$HOME/my_client_cert
ClientTLSCert io.Reader
// Reader for the TLC client key that should be used by the SDK's HTTP
// transport when making requests. The key must be paired with a TLS client
// certificate file. Will be ignored if both are not provided.
//
// HTTP Client's Transport concrete implementation must be a http.Transport
// or creating the session will fail.
//
// Can also be specified via the environment variable:
//
// AWS_SDK_GO_CLIENT_TLS_KEY=$HOME/my_client_key
ClientTLSKey io.Reader
// The handlers that the session and all API clients will be created with.
// This must be a complete set of handlers. Use the defaults.Handlers()
// function to initialize this value before changing the handlers to be
// used by the SDK.
Handlers request.Handlers
// Allows specifying a custom endpoint to be used by the EC2 IMDS client
// when making requests to the EC2 IMDS API. The must endpoint value must
// include protocol prefix.
//
// If unset, will the EC2 IMDS client will use its default endpoint.
//
// Can also be specified via the environment variable,
// AWS_EC2_METADATA_SERVICE_ENDPOINT.
//
// AWS_EC2_METADATA_SERVICE_ENDPOINT=http://169.254.169.254
//
// If using an URL with an IPv6 address literal, the IPv6 address
// component must be enclosed in square brackets.
//
// AWS_EC2_METADATA_SERVICE_ENDPOINT=http://[::1]
EC2IMDSEndpoint string
}
// NewSessionWithOptions returns a new Session created from SDK defaults, config files,
// environment, and user provided config files. This func uses the Options
// values to configure how the Session is created.
//
// If the AWS_SDK_LOAD_CONFIG environment variable is set to a truthy value
// the shared config file (~/.aws/config) will also be loaded in addition to
// the shared credentials file (~/.aws/credentials). Values set in both the
// shared config, and shared credentials will be taken from the shared
// credentials file. Enabling the Shared Config will also allow the Session
// to be built with retrieving credentials with AssumeRole set in the config.
//
// // Equivalent to session.New
// sess := session.Must(session.NewSessionWithOptions(session.Options{}))
//
// // Specify profile to load for the session's config
// sess := session.Must(session.NewSessionWithOptions(session.Options{
// Profile: "profile_name",
// }))
//
// // Specify profile for config and region for requests
// sess := session.Must(session.NewSessionWithOptions(session.Options{
// Config: aws.Config{Region: aws.String("us-east-1")},
// Profile: "profile_name",
// }))
//
// // Force enable Shared Config support
// sess := session.Must(session.NewSessionWithOptions(session.Options{
// SharedConfigState: session.SharedConfigEnable,
// }))
func NewSessionWithOptions(opts Options) (*Session, error) {
var envCfg envConfig
var err error
if opts.SharedConfigState == SharedConfigEnable {
envCfg, err = loadSharedEnvConfig()
if err != nil {
return nil, fmt.Errorf("failed to load shared config, %v", err)
}
} else {
envCfg, err = loadEnvConfig()
if err != nil {
return nil, fmt.Errorf("failed to load environment config, %v", err)
}
}
if len(opts.Profile) != 0 {
envCfg.Profile = opts.Profile
}
switch opts.SharedConfigState {
case SharedConfigDisable:
envCfg.EnableSharedConfig = false
case SharedConfigEnable:
envCfg.EnableSharedConfig = true
}
return newSession(opts, envCfg, &opts.Config)
}
// Must is a helper function to ensure the Session is valid and there was no
// error when calling a NewSession function.
//
// This helper is intended to be used in variable initialization to load the
// Session and configuration at startup. Such as:
//
// var sess = session.Must(session.NewSession())
func Must(sess *Session, err error) *Session {
if err != nil {
panic(err)
}
return sess
}
// Wraps the endpoint resolver with a resolver that will return a custom
// endpoint for EC2 IMDS.
func wrapEC2IMDSEndpoint(resolver endpoints.Resolver, endpoint string) endpoints.Resolver {
return endpoints.ResolverFunc(
func(service, region string, opts ...func(*endpoints.Options)) (
endpoints.ResolvedEndpoint, error,
) {
if service == ec2MetadataServiceID {
return endpoints.ResolvedEndpoint{
URL: endpoint,
SigningName: ec2MetadataServiceID,
SigningRegion: region,
}, nil
}
return resolver.EndpointFor(service, region)
})
}
func deprecatedNewSession(envCfg envConfig, cfgs ...*aws.Config) *Session {
cfg := defaults.Config()
handlers := defaults.Handlers()
// Apply the passed in configs so the configuration can be applied to the
// default credential chain
cfg.MergeIn(cfgs...)
if cfg.EndpointResolver == nil {
// An endpoint resolver is required for a session to be able to provide
// endpoints for service client configurations.
cfg.EndpointResolver = endpoints.DefaultResolver()
}
if len(envCfg.EC2IMDSEndpoint) != 0 {
cfg.EndpointResolver = wrapEC2IMDSEndpoint(cfg.EndpointResolver, envCfg.EC2IMDSEndpoint)
}
cfg.Credentials = defaults.CredChain(cfg, handlers)
// Reapply any passed in configs to override credentials if set
cfg.MergeIn(cfgs...)
s := &Session{
Config: cfg,
Handlers: handlers,
options: Options{
EC2IMDSEndpoint: envCfg.EC2IMDSEndpoint,
},
}
initHandlers(s)
return s
}
func enableCSM(handlers *request.Handlers, cfg csmConfig, logger aws.Logger) error {
if logger != nil {
logger.Log("Enabling CSM")
}
r, err := csm.Start(cfg.ClientID, csm.AddressWithDefaults(cfg.Host, cfg.Port))
if err != nil {
return err
}
r.InjectHandlers(handlers)
return nil
}
func newSession(opts Options, envCfg envConfig, cfgs ...*aws.Config) (*Session, error) {
cfg := defaults.Config()
handlers := opts.Handlers
if handlers.IsEmpty() {
handlers = defaults.Handlers()
}
// Get a merged version of the user provided config to determine if
// credentials were.
userCfg := &aws.Config{}
userCfg.MergeIn(cfgs...)
cfg.MergeIn(userCfg)
// Ordered config files will be loaded in with later files overwriting
// previous config file values.
var cfgFiles []string
if opts.SharedConfigFiles != nil {
cfgFiles = opts.SharedConfigFiles
} else {
cfgFiles = []string{envCfg.SharedConfigFile, envCfg.SharedCredentialsFile}
if !envCfg.EnableSharedConfig {
// The shared config file (~/.aws/config) is only loaded if instructed
// to load via the envConfig.EnableSharedConfig (AWS_SDK_LOAD_CONFIG).
cfgFiles = cfgFiles[1:]
}
}
// Load additional config from file(s)
sharedCfg, err := loadSharedConfig(envCfg.Profile, cfgFiles, envCfg.EnableSharedConfig)
if err != nil {
if len(envCfg.Profile) == 0 && !envCfg.EnableSharedConfig && (envCfg.Creds.HasKeys() || userCfg.Credentials != nil) {
// Special case where the user has not explicitly specified an AWS_PROFILE,
// or session.Options.profile, shared config is not enabled, and the
// environment has credentials, allow the shared config file to fail to
// load since the user has already provided credentials, and nothing else
// is required to be read file. Github(aws/aws-sdk-go#2455)
} else if _, ok := err.(SharedConfigProfileNotExistsError); !ok {
return nil, err
}
}
if err := mergeConfigSrcs(cfg, userCfg, envCfg, sharedCfg, handlers, opts); err != nil {
return nil, err
}
if err := setTLSOptions(&opts, cfg, envCfg, sharedCfg); err != nil {
return nil, err
}
s := &Session{
Config: cfg,
Handlers: handlers,
options: opts,
}
initHandlers(s)
if csmCfg, err := loadCSMConfig(envCfg, cfgFiles); err != nil {
if l := s.Config.Logger; l != nil {
l.Log(fmt.Sprintf("ERROR: failed to load CSM configuration, %v", err))
}
} else if csmCfg.Enabled {
err = enableCSM(&s.Handlers, csmCfg, s.Config.Logger)
if err != nil {
return nil, err
}
}
return s, nil
}
type csmConfig struct {
Enabled bool
Host string
Port string
ClientID string
}
var csmProfileName = "aws_csm"
func loadCSMConfig(envCfg envConfig, cfgFiles []string) (csmConfig, error) {
if envCfg.CSMEnabled != nil {
if *envCfg.CSMEnabled {
return csmConfig{
Enabled: true,
ClientID: envCfg.CSMClientID,
Host: envCfg.CSMHost,
Port: envCfg.CSMPort,
}, nil
}
return csmConfig{}, nil
}
sharedCfg, err := loadSharedConfig(csmProfileName, cfgFiles, false)
if err != nil {
if _, ok := err.(SharedConfigProfileNotExistsError); !ok {
return csmConfig{}, err
}
}
if sharedCfg.CSMEnabled != nil && *sharedCfg.CSMEnabled == true {
return csmConfig{
Enabled: true,
ClientID: sharedCfg.CSMClientID,
Host: sharedCfg.CSMHost,
Port: sharedCfg.CSMPort,
}, nil
}
return csmConfig{}, nil
}
func setTLSOptions(opts *Options, cfg *aws.Config, envCfg envConfig, sharedCfg sharedConfig) error {
// CA Bundle can be specified in both environment variable shared config file.
var caBundleFilename = envCfg.CustomCABundle
if len(caBundleFilename) == 0 {
caBundleFilename = sharedCfg.CustomCABundle
}
// Only use environment value if session option is not provided.
customTLSOptions := map[string]struct {
filename string
field *io.Reader
errCode string
}{
"custom CA bundle PEM": {filename: caBundleFilename, field: &opts.CustomCABundle, errCode: ErrCodeLoadCustomCABundle},
"custom client TLS cert": {filename: envCfg.ClientTLSCert, field: &opts.ClientTLSCert, errCode: ErrCodeLoadClientTLSCert},
"custom client TLS key": {filename: envCfg.ClientTLSKey, field: &opts.ClientTLSKey, errCode: ErrCodeLoadClientTLSCert},
}
for name, v := range customTLSOptions {
if len(v.filename) != 0 && *v.field == nil {
f, err := os.Open(v.filename)
if err != nil {
return awserr.New(v.errCode, fmt.Sprintf("failed to open %s file", name), err)
}
defer f.Close()
*v.field = f
}
}
// Setup HTTP client with custom cert bundle if enabled
if opts.CustomCABundle != nil {
if err := loadCustomCABundle(cfg.HTTPClient, opts.CustomCABundle); err != nil {
return err
}
}
// Setup HTTP client TLS certificate and key for client TLS authentication.
if opts.ClientTLSCert != nil && opts.ClientTLSKey != nil {
if err := loadClientTLSCert(cfg.HTTPClient, opts.ClientTLSCert, opts.ClientTLSKey); err != nil {
return err
}
} else if opts.ClientTLSCert == nil && opts.ClientTLSKey == nil {
// Do nothing if neither values are available.
} else {
return awserr.New(ErrCodeLoadClientTLSCert,
fmt.Sprintf("client TLS cert(%t) and key(%t) must both be provided",
opts.ClientTLSCert != nil, opts.ClientTLSKey != nil), nil)
}
return nil
}
func getHTTPTransport(client *http.Client) (*http.Transport, error) {
var t *http.Transport
switch v := client.Transport.(type) {
case *http.Transport:
t = v
default:
if client.Transport != nil {
return nil, fmt.Errorf("unsupported transport, %T", client.Transport)
}
}
if t == nil {
// Nil transport implies `http.DefaultTransport` should be used. Since
// the SDK cannot modify, nor copy the `DefaultTransport` specifying
// the values the next closest behavior.
t = getCustomTransport()
}
return t, nil
}
func loadCustomCABundle(client *http.Client, bundle io.Reader) error {
t, err := getHTTPTransport(client)
if err != nil {
return awserr.New(ErrCodeLoadCustomCABundle,
"unable to load custom CA bundle, HTTPClient's transport unsupported type", err)
}
p, err := loadCertPool(bundle)
if err != nil {
return err
}
if t.TLSClientConfig == nil {
t.TLSClientConfig = &tls.Config{}
}
t.TLSClientConfig.RootCAs = p
client.Transport = t
return nil
}
func loadCertPool(r io.Reader) (*x509.CertPool, error) {
b, err := ioutil.ReadAll(r)
if err != nil {
return nil, awserr.New(ErrCodeLoadCustomCABundle,
"failed to read custom CA bundle PEM file", err)
}
p := x509.NewCertPool()
if !p.AppendCertsFromPEM(b) {
return nil, awserr.New(ErrCodeLoadCustomCABundle,
"failed to load custom CA bundle PEM file", err)
}
return p, nil
}
func loadClientTLSCert(client *http.Client, certFile, keyFile io.Reader) error {
t, err := getHTTPTransport(client)
if err != nil {
return awserr.New(ErrCodeLoadClientTLSCert,
"unable to get usable HTTP transport from client", err)
}
cert, err := ioutil.ReadAll(certFile)
if err != nil {
return awserr.New(ErrCodeLoadClientTLSCert,
"unable to get read client TLS cert file", err)
}
key, err := ioutil.ReadAll(keyFile)
if err != nil {
return awserr.New(ErrCodeLoadClientTLSCert,
"unable to get read client TLS key file", err)
}
clientCert, err := tls.X509KeyPair(cert, key)
if err != nil {
return awserr.New(ErrCodeLoadClientTLSCert,
"unable to load x509 key pair from client cert", err)
}
tlsCfg := t.TLSClientConfig
if tlsCfg == nil {
tlsCfg = &tls.Config{}
}
tlsCfg.Certificates = append(tlsCfg.Certificates, clientCert)
t.TLSClientConfig = tlsCfg
client.Transport = t
return nil
}
func mergeConfigSrcs(cfg, userCfg *aws.Config,
envCfg envConfig, sharedCfg sharedConfig,
handlers request.Handlers,
sessOpts Options,
) error {
// Region if not already set by user
if len(aws.StringValue(cfg.Region)) == 0 {
if len(envCfg.Region) > 0 {
cfg.WithRegion(envCfg.Region)
} else if envCfg.EnableSharedConfig && len(sharedCfg.Region) > 0 {
cfg.WithRegion(sharedCfg.Region)
}
}
if cfg.EnableEndpointDiscovery == nil {
if envCfg.EnableEndpointDiscovery != nil {
cfg.WithEndpointDiscovery(*envCfg.EnableEndpointDiscovery)
} else if envCfg.EnableSharedConfig && sharedCfg.EnableEndpointDiscovery != nil {
cfg.WithEndpointDiscovery(*sharedCfg.EnableEndpointDiscovery)
}
}
// Regional Endpoint flag for STS endpoint resolving
mergeSTSRegionalEndpointConfig(cfg, []endpoints.STSRegionalEndpoint{
userCfg.STSRegionalEndpoint,
envCfg.STSRegionalEndpoint,
sharedCfg.STSRegionalEndpoint,
endpoints.LegacySTSEndpoint,
})
// Regional Endpoint flag for S3 endpoint resolving
mergeS3UsEast1RegionalEndpointConfig(cfg, []endpoints.S3UsEast1RegionalEndpoint{
userCfg.S3UsEast1RegionalEndpoint,
envCfg.S3UsEast1RegionalEndpoint,
sharedCfg.S3UsEast1RegionalEndpoint,
endpoints.LegacyS3UsEast1Endpoint,
})
ec2IMDSEndpoint := sessOpts.EC2IMDSEndpoint
if len(ec2IMDSEndpoint) == 0 {
ec2IMDSEndpoint = envCfg.EC2IMDSEndpoint
}
if len(ec2IMDSEndpoint) != 0 {
cfg.EndpointResolver = wrapEC2IMDSEndpoint(cfg.EndpointResolver, ec2IMDSEndpoint)
}
// Configure credentials if not already set by the user when creating the
// Session.
if cfg.Credentials == credentials.AnonymousCredentials && userCfg.Credentials == nil {
creds, err := resolveCredentials(cfg, envCfg, sharedCfg, handlers, sessOpts)
if err != nil {
return err
}
cfg.Credentials = creds
}
cfg.S3UseARNRegion = userCfg.S3UseARNRegion
if cfg.S3UseARNRegion == nil {
cfg.S3UseARNRegion = &envCfg.S3UseARNRegion
}
if cfg.S3UseARNRegion == nil {
cfg.S3UseARNRegion = &sharedCfg.S3UseARNRegion
}
return nil
}
func mergeSTSRegionalEndpointConfig(cfg *aws.Config, values []endpoints.STSRegionalEndpoint) {
for _, v := range values {
if v != endpoints.UnsetSTSEndpoint {
cfg.STSRegionalEndpoint = v
break
}
}
}
func mergeS3UsEast1RegionalEndpointConfig(cfg *aws.Config, values []endpoints.S3UsEast1RegionalEndpoint) {
for _, v := range values {
if v != endpoints.UnsetS3UsEast1Endpoint {
cfg.S3UsEast1RegionalEndpoint = v
break
}
}
}
func initHandlers(s *Session) {
// Add the Validate parameter handler if it is not disabled.
s.Handlers.Validate.Remove(corehandlers.ValidateParametersHandler)
if !aws.BoolValue(s.Config.DisableParamValidation) {
s.Handlers.Validate.PushBackNamed(corehandlers.ValidateParametersHandler)
}
}
// Copy creates and returns a copy of the current Session, copying the config
// and handlers. If any additional configs are provided they will be merged
// on top of the Session's copied config.
//
// // Create a copy of the current Session, configured for the us-west-2 region.
// sess.Copy(&aws.Config{Region: aws.String("us-west-2")})
func (s *Session) Copy(cfgs ...*aws.Config) *Session {
newSession := &Session{
Config: s.Config.Copy(cfgs...),
Handlers: s.Handlers.Copy(),
options: s.options,
}
initHandlers(newSession)
return newSession
}
// ClientConfig satisfies the client.ConfigProvider interface and is used to
// configure the service client instances. Passing the Session to the service
// client's constructor (New) will use this method to configure the client.
func (s *Session) ClientConfig(service string, cfgs ...*aws.Config) client.Config {
s = s.Copy(cfgs...)
region := aws.StringValue(s.Config.Region)
resolved, err := s.resolveEndpoint(service, region, s.Config)
if err != nil {
s.Handlers.Validate.PushBack(func(r *request.Request) {
if len(r.ClientInfo.Endpoint) != 0 {
// Error occurred while resolving endpoint, but the request
// being invoked has had an endpoint specified after the client
// was created.
return
}
r.Error = err
})
}
return client.Config{
Config: s.Config,
Handlers: s.Handlers,
PartitionID: resolved.PartitionID,
Endpoint: resolved.URL,
SigningRegion: resolved.SigningRegion,
SigningNameDerived: resolved.SigningNameDerived,
SigningName: resolved.SigningName,
}
}
const ec2MetadataServiceID = "ec2metadata"
func (s *Session) resolveEndpoint(service, region string, cfg *aws.Config) (endpoints.ResolvedEndpoint, error) {
if ep := aws.StringValue(cfg.Endpoint); len(ep) != 0 {
return endpoints.ResolvedEndpoint{
URL: endpoints.AddScheme(ep, aws.BoolValue(cfg.DisableSSL)),
SigningRegion: region,
}, nil
}
resolved, err := cfg.EndpointResolver.EndpointFor(service, region,
func(opt *endpoints.Options) {
opt.DisableSSL = aws.BoolValue(cfg.DisableSSL)
opt.UseDualStack = aws.BoolValue(cfg.UseDualStack)
// Support for STSRegionalEndpoint where the STSRegionalEndpoint is
// provided in envConfig or sharedConfig with envConfig getting
// precedence.
opt.STSRegionalEndpoint = cfg.STSRegionalEndpoint
// Support for S3UsEast1RegionalEndpoint where the S3UsEast1RegionalEndpoint is
// provided in envConfig or sharedConfig with envConfig getting
// precedence.
opt.S3UsEast1RegionalEndpoint = cfg.S3UsEast1RegionalEndpoint
// Support the condition where the service is modeled but its
// endpoint metadata is not available.
opt.ResolveUnknownService = true
},
)
if err != nil {
return endpoints.ResolvedEndpoint{}, err
}
return resolved, nil
}
// ClientConfigNoResolveEndpoint is the same as ClientConfig with the exception
// that the EndpointResolver will not be used to resolve the endpoint. The only
// endpoint set must come from the aws.Config.Endpoint field.
func (s *Session) ClientConfigNoResolveEndpoint(cfgs ...*aws.Config) client.Config {
s = s.Copy(cfgs...)
var resolved endpoints.ResolvedEndpoint
if ep := aws.StringValue(s.Config.Endpoint); len(ep) > 0 {
resolved.URL = endpoints.AddScheme(ep, aws.BoolValue(s.Config.DisableSSL))
resolved.SigningRegion = aws.StringValue(s.Config.Region)
}
return client.Config{
Config: s.Config,
Handlers: s.Handlers,
Endpoint: resolved.URL,
SigningRegion: resolved.SigningRegion,
SigningNameDerived: resolved.SigningNameDerived,
SigningName: resolved.SigningName,
}
}
// logDeprecatedNewSessionError function enables error handling for session
func (s *Session) logDeprecatedNewSessionError(msg string, err error, cfgs []*aws.Config) {
// Session creation failed, need to report the error and prevent
// any requests from succeeding.
s.Config.MergeIn(cfgs...)
s.Config.Logger.Log("ERROR:", msg, "Error:", err)
s.Handlers.Validate.PushBack(func(r *request.Request) {
r.Error = err
})
}