120 lines
3.1 KiB
Go
120 lines
3.1 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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"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/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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region, err := c.Region()
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if err != nil {
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return nil, err
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}
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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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log.Printf("Set env error: %s", err)
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}
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}
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config := aws.NewConfig().WithRegion(region).WithMaxRetries(11).WithCredentialsChainVerboseErrors(true)
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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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c.session, err = session.NewSessionWithOptions(opts)
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if err != nil {
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return nil, err
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}
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return c.session, nil
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}
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// Region returns the aws.Region object for access to AWS services, requesting
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// the region from the instance metadata if possible.
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func (c *AccessConfig) Region() (string, error) {
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if c.RawRegion != "" {
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if !c.SkipValidation {
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if valid := ValidateRegion(c.RawRegion); !valid {
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return "", fmt.Errorf("Not a valid region: %s", c.RawRegion)
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}
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}
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return c.RawRegion, nil
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}
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sess := session.New()
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ec2meta := ec2metadata.New(sess)
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identity, err := ec2meta.GetInstanceIdentityDocument()
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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 "", nil
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}
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return identity.Region, nil
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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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if len(errs) > 0 {
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return errs
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}
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return nil
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}
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