121 lines
3.2 KiB
Go
121 lines
3.2 KiB
Go
package common
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import (
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"fmt"
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"log"
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"os"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/ec2metadata"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/hashicorp/go-cleanhttp"
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"github.com/hashicorp/packer/template/interpolate"
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)
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// AccessConfig is for common configuration related to AWS access
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type AccessConfig struct {
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AccessKey string `mapstructure:"access_key"`
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CustomEndpointEc2 string `mapstructure:"custom_endpoint_ec2"`
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MFACode string `mapstructure:"mfa_code"`
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ProfileName string `mapstructure:"profile"`
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RawRegion string `mapstructure:"region"`
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SecretKey string `mapstructure:"secret_key"`
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SkipValidation bool `mapstructure:"skip_region_validation"`
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Token string `mapstructure:"token"`
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session *session.Session
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}
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// Config returns a valid aws.Config object for access to AWS services, or
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// an error if the authentication and region couldn't be resolved
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func (c *AccessConfig) Session() (*session.Session, error) {
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if c.session != nil {
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return c.session, nil
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}
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config := aws.NewConfig().WithMaxRetries(11).WithCredentialsChainVerboseErrors(true)
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if c.ProfileName != "" {
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if err := os.Setenv("AWS_PROFILE", c.ProfileName); err != nil {
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return nil, fmt.Errorf("Set env error: %s", err)
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}
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}
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if c.RawRegion != "" {
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config = config.WithRegion(c.RawRegion)
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} else if region := c.metadataRegion(); region != "" {
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config = config.WithRegion(region)
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}
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if c.CustomEndpointEc2 != "" {
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config = config.WithEndpoint(c.CustomEndpointEc2)
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}
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if c.AccessKey != "" {
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creds := credentials.NewChainCredentials(
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[]credentials.Provider{
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&credentials.StaticProvider{
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Value: credentials.Value{
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AccessKeyID: c.AccessKey,
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SecretAccessKey: c.SecretKey,
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SessionToken: c.Token,
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},
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},
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})
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config = config.WithCredentials(creds)
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}
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opts := session.Options{
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SharedConfigState: session.SharedConfigEnable,
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Config: *config,
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}
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if c.MFACode != "" {
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opts.AssumeRoleTokenProvider = func() (string, error) {
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return c.MFACode, nil
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}
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}
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if sess, err := session.NewSessionWithOptions(opts); err != nil {
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return nil, err
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} else if *sess.Config.Region == "" {
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return nil, fmt.Errorf("Could not find AWS region, make sure it's set.")
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} else {
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log.Printf("Found region %s", *sess.Config.Region)
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c.session = sess
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}
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return c.session, nil
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}
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// metadataRegion returns the region from the metadata service
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func (c *AccessConfig) metadataRegion() string {
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client := cleanhttp.DefaultClient()
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// Keep the default timeout (100ms) low as we don't want to wait in non-EC2 environments
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client.Timeout = 100 * time.Millisecond
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ec2meta := ec2metadata.New(session.New(), &aws.Config{
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HTTPClient: client,
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})
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region, err := ec2meta.Region()
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if err != nil {
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log.Println("Error getting region from metadata service, "+
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"probably because we're not running on AWS.", err)
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return ""
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}
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return region
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}
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func (c *AccessConfig) Prepare(ctx *interpolate.Context) []error {
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var errs []error
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if c.RawRegion != "" && !c.SkipValidation {
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if valid := ValidateRegion(c.RawRegion); !valid {
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errs = append(errs, fmt.Errorf("Unknown region: %s", c.RawRegion))
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}
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}
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return errs
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}
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