func()

in google/internal/externalaccount/aws.go [343:382]

• 32 lines of code
• 9 McCabe index (conditional complexity)

func (cs *awsCredentialSource) getRegion() (string, error) {
	if envAwsRegion := getenv("AWS_REGION"); envAwsRegion != "" {
		return envAwsRegion, nil
	}
	if envAwsRegion := getenv("AWS_DEFAULT_REGION"); envAwsRegion != "" {
		return envAwsRegion, nil
	}

	if cs.RegionURL == "" {
		return "", errors.New("oauth2/google: unable to determine AWS region")
	}

	req, err := http.NewRequest("GET", cs.RegionURL, nil)
	if err != nil {
		return "", err
	}

	resp, err := cs.doRequest(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	respBody, err := ioutil.ReadAll(io.LimitReader(resp.Body, 1<<20))
	if err != nil {
		return "", err
	}

	if resp.StatusCode != 200 {
		return "", fmt.Errorf("oauth2/google: unable to retrieve AWS region - %s", string(respBody))
	}

	// This endpoint will return the region in format: us-east-2b.
	// Only the us-east-2 part should be used.
	respBodyEnd := 0
	if len(respBody) > 1 {
		respBodyEnd = len(respBody) - 1
	}
	return string(respBody[:respBodyEnd]), nil
}