forked from Versent/saml2aws
/
script.go
102 lines (84 loc) · 2.45 KB
/
script.go
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package commands
import (
"fmt"
"os"
"text/template"
"time"
"github.com/pkg/errors"
"github.com/versent/saml2aws/pkg/awsconfig"
"github.com/versent/saml2aws/pkg/flags"
)
const bashTmpl = `export AWS_ACCESS_KEY_ID="{{ .AWSAccessKey }}"
export AWS_SECRET_ACCESS_KEY="{{ .AWSSecretKey }}"
export AWS_SESSION_TOKEN="{{ .AWSSessionToken }}"
export AWS_SECURITY_TOKEN="{{ .AWSSecurityToken }}"
export SAML2AWS_PROFILE="{{ .ProfileName }}"
`
const fishTmpl = `set -gx AWS_ACCESS_KEY_ID {{ .AWSAccessKey }}
set -gx AWS_SECRET_ACCESS_KEY {{ .AWSSecretKey }}
set -gx AWS_SESSION_TOKEM {{ .AWSSessionToken }}
set -gx AWS_SECURITY_TOKEN {{ .AWSSecurityToken }}
set -gx SAML2AWS_PROFILE {{ .ProfileName }}
"
`
const powershellTmpl = `$env:AWS_ACCESS_KEY_ID='{{ .AWSAccessKey }}'
$env:AWS_SECRET_ACCESS_KEY='{{ .AWSSecretKey }}'
$env:AWS_SESSION_TOKEN='{{ .AWSSessionToken }}'
$env:AWS_SECURITY_TOKEN='{{ .AWSSecurityToken }}'
$env:SAML2AWS_PROFILE='{{ .ProfileName }}'
`
// Script will emit a bash script that will export environment variables
func Script(execFlags *flags.LoginExecFlags, shell string) error {
account, err := buildIdpAccount(execFlags)
if err != nil {
return errors.Wrap(err, "error building login details")
}
sharedCreds := awsconfig.NewSharedCredentials(account.Profile)
// this checks if the credentials file has been created yet
// can only really be triggered if saml2aws exec is run on a new
// system prior to creating $HOME/.aws
exist, err := sharedCreds.CredsExists()
if err != nil {
return errors.Wrap(err, "error loading credentials")
}
if !exist {
fmt.Println("unable to load credentials, login required to create them")
return nil
}
awsCreds, err := sharedCreds.Load()
if err != nil {
return errors.Wrap(err, "error loading credentials")
}
if awsCreds.Expires.Sub(time.Now()) < 0 {
return errors.New("error aws credentials have expired")
}
// annoymous struct to pass to template
data := struct {
ProfileName string
*awsconfig.AWSCredentials
}{
account.Profile,
awsCreds,
}
err = buildTmpl(shell, data)
if err != nil {
return errors.Wrap(err, "error generating template")
}
return nil
}
func buildTmpl(shell string, data interface{}) error {
t := template.New("envvar_script")
var err error
switch shell {
case "bash":
t, err = t.Parse(bashTmpl)
case "powershell":
t, err = t.Parse(powershellTmpl)
case "fish":
t, err = t.Parse(fishTmpl)
}
if err != nil {
return err
}
return t.Execute(os.Stdout, data)
}