104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
package common
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"strings"
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"unicode"
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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/credentials/ec2rolecreds"
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"github.com/mitchellh/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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SecretKey string `mapstructure:"secret_key"`
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RawRegion string `mapstructure:"region"`
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Token string `mapstructure:"token"`
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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) Config() (*aws.Config, error) {
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creds := credentials.NewChainCredentials([]credentials.Provider{
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&credentials.StaticProvider{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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&credentials.EnvProvider{},
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&credentials.SharedCredentialsProvider{Filename: "", Profile: ""},
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&ec2rolecreds.EC2RoleProvider{},
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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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return &aws.Config{
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Region: aws.String(region),
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Credentials: creds,
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MaxRetries: aws.Int(11),
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}, 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 valid := ValidateRegion(c.RawRegion); valid == false {
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return "", fmt.Errorf("Not a valid region: %s", c.RawRegion)
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}
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return c.RawRegion, nil
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}
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md, err := GetInstanceMetaData("placement/availability-zone")
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if err != nil {
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return "", err
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}
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region := strings.TrimRightFunc(string(md), unicode.IsLetter)
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return 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 != "" {
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if valid := ValidateRegion(c.RawRegion); valid == false {
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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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func GetInstanceMetaData(path string) (contents []byte, err error) {
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url := "http://169.254.169.254/latest/meta-data/" + path
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resp, err := http.Get(url)
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if err != nil {
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return
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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err = fmt.Errorf("Code %d returned for url %s", resp.StatusCode, url)
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return
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}
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return
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}
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return []byte(body), err
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}
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