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session.go
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session.go
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package awsutil
import (
"fmt"
"net"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
log "github.com/sirupsen/logrus"
)
const (
GlobalRegionID = "global"
DefaultRegionID = endpoints.UsEast1RegionID
)
type Credentials struct {
Profile string
AccessKeyID string
SecretAccessKey string
SessionToken string
session *session.Session
}
func (c *Credentials) HasProfile() bool {
return strings.TrimSpace(c.Profile) != ""
}
func (c *Credentials) HasKeys() bool {
return strings.TrimSpace(c.AccessKeyID) != "" ||
strings.TrimSpace(c.SecretAccessKey) != "" ||
strings.TrimSpace(c.SessionToken) != ""
}
func (c *Credentials) Validate() error {
if c.HasProfile() == c.HasKeys() {
return fmt.Errorf("You have to specify the --profile flag OR " +
"--access-key-id with --secret-access-key and optionally " +
"--session-token.\n")
}
return nil
}
func (c *Credentials) rootSession() (*session.Session, error) {
if c.session == nil {
var opts session.Options
region := DefaultRegionID
log.Debugf("creating new root session in %s", region)
switch {
case c.HasProfile() == c.HasKeys():
return nil, fmt.Errorf("You have to specify a profile or credentials for at least one region.")
case c.HasProfile():
opts = session.Options{
SharedConfigState: session.SharedConfigEnable,
Profile: c.Profile,
AssumeRoleTokenProvider: stscreds.StdinTokenProvider,
}
case c.HasKeys():
opts = session.Options{
Config: aws.Config{
Credentials: credentials.NewStaticCredentials(
strings.TrimSpace(c.AccessKeyID),
strings.TrimSpace(c.SecretAccessKey),
strings.TrimSpace(c.SessionToken),
)}}
}
opts.Config.Region = aws.String(region)
opts.Config.DisableRestProtocolURICleaning = aws.Bool(true)
sess, err := session.NewSessionWithOptions(opts)
if err != nil {
return nil, err
}
c.session = sess
}
return c.session, nil
}
func (c *Credentials) NewSession(region string) (*session.Session, error) {
log.Debugf("creating new session in %s", region)
global := false
if region == GlobalRegionID {
region = DefaultRegionID
global = true
}
root, err := c.rootSession()
if err != nil {
return nil, err
}
sess := root.Copy(&aws.Config{
Region: ®ion,
})
sess.Handlers.Send.PushFront(func(r *request.Request) {
log.Debugf("sending AWS request:\n%s", DumpRequest(r.HTTPRequest))
})
sess.Handlers.ValidateResponse.PushFront(func(r *request.Request) {
log.Debugf("received AWS response:\n%s", DumpResponse(r.HTTPResponse))
})
sess.Handlers.Validate.PushFront(skipMissingServiceInRegionHandler)
sess.Handlers.Validate.PushFront(skipGlobalHandler(global))
return sess, nil
}
func skipMissingServiceInRegionHandler(r *request.Request) {
region := *r.Config.Region
service := r.ClientInfo.ServiceName
rs, ok := endpoints.RegionsForService(endpoints.DefaultPartitions(), endpoints.AwsPartitionID, service)
if !ok {
// This means that the service does not exist and this shouldn't be handled here.
return
}
if len(rs) == 0 {
// Avoid to throw an error on global services.
return
}
_, ok = rs[region]
if !ok {
r.Error = ErrSkipRequest(fmt.Sprintf(
"service '%s' is not available in region '%s'",
service, region))
}
}
func skipGlobalHandler(global bool) func(r *request.Request) {
return func(r *request.Request) {
service := r.ClientInfo.ServiceName
rs, ok := endpoints.RegionsForService(endpoints.DefaultPartitions(), endpoints.AwsPartitionID, service)
if !ok {
// This means that the service does not exist in the endpoints list.
if global {
r.Error = ErrSkipRequest(fmt.Sprintf("service '%s' is was not found in the endpoint list; assuming it is not global", service))
} else {
host := r.HTTPRequest.URL.Hostname()
_, err := net.LookupHost(host)
if err != nil {
log.Debug(err)
r.Error = ErrUnknownEndpoint(fmt.Sprintf("DNS lookup failed for %s; assuming it does not exist in this region", host))
}
}
return
}
if len(rs) == 0 && !global {
r.Error = ErrSkipRequest(fmt.Sprintf("service '%s' is global, but the session is not", service))
return
}
if len(rs) > 0 && global {
r.Error = ErrSkipRequest(fmt.Sprintf("service '%s' is not global, but the session is", service))
return
}
}
}