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package pike
import (
"context"
"encoding/json"
"fmt"
"net/url"
"reflect"
"sort"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/iam"
"github.com/rs/zerolog/log"
)
const pollIntervalSeconds int = 5
// Watch looks at IAM policy for new revisions.
func Watch(arn string, wait int) error {
if arn == "" {
return &arnEmptyError{}
}
if wait <= 0 {
return fmt.Errorf("wait time must be positive, got %d", wait)
}
if err := verifyAWSARN(arn); err != nil {
return fmt.Errorf("invalid ARN format: %s", arn)
}
// Load the Shared AWS Configuration (~/.aws/config)
ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout)
defer cancel()
cfg, err := config.LoadDefaultConfig(ctx)
if err != nil {
return &awsConfigError{err}
}
client := iam.NewFromConfig(cfg)
Version, err := getVersion(client, arn)
if err != nil {
return &getVersionError{err}
}
log.Info().Msgf("Waiting for change on policy Version %s", *Version)
delay, err := waitForPolicyChange(client, arn, *Version, wait, pollIntervalSeconds) // Added default pollInterval of 10
if err != nil {
return &waitForPolicyChangeError{err}
}
log.Info().Msgf("Policy updated after %d", delay)
return nil
}
// waitForPolicyChange looks at IAM policy change.
func waitForPolicyChange(client *iam.Client, arn string, version string, wait, pollInterval int) (int, error) {
for item := 1; item < wait; item++ {
time.Sleep(time.Duration(pollInterval))
NewVersion, err := getVersion(client, arn)
if err != nil {
continue
}
if *NewVersion != version {
return item, nil
}
log.Print("Not equal")
}
return wait, &waitExpiredError{}
}
type waitExpiredError struct{}
func (e *waitExpiredError) Error() string {
return "wait expired with no change"
}
// getVersion gets the version of the IAM policy.
func getVersion(client *iam.Client, policyArn string) (*string, error) {
output, err := client.GetPolicy(context.Background(), &iam.GetPolicyInput{PolicyArn: aws.String(policyArn)})
if err != nil {
return nil, &getVersionError{err}
}
return output.Policy.DefaultVersionId, nil
}
type urlEscapeError struct {
err error
}
func (e *urlEscapeError) Error() string {
return fmt.Sprintf("failed to unescape url: %v", e.err)
}
// getPolicyVersion Obtains the versioned IAM policy.
func getPolicyVersion(client *iam.Client, policyArn string, version string) (*string, error) {
output, err := client.GetPolicyVersion(
context.Background(),
&iam.GetPolicyVersionInput{
PolicyArn: aws.String(policyArn),
VersionId: &version,
})
if err != nil {
return nil, &getVersionError{err}
}
Policy, err := url.QueryUnescape(*(output.PolicyVersion.Document))
if err != nil {
return nil, &urlEscapeError{err}
}
fixed, err := sortActions(Policy)
if err != nil {
return nil, &sortActionsError{Policy}
}
return fixed, err
}
type castToListOfInterfaceError struct{}
func (e *castToListOfInterfaceError) Error() string {
return "failed to convert to list of interfaces"
}
// sortActions sorts the actions list of an IAM policy.
func sortActions(myPolicy string) (*string, error) {
var raw map[string]interface{}
err := json.Unmarshal([]byte(myPolicy), &raw)
if err != nil {
return nil, &unmarshallJSONError{err, myPolicy}
}
Statements, ok := raw["Statement"].([]interface{})
if !ok {
return nil, &castToListOfInterfaceError{}
}
var NewStatements []interface{}
for _, block := range Statements {
blocked, ok := block.(map[string]interface{})
if !ok {
log.Info().Msgf("assertion failed")
}
Actions := blocked["Action"]
switch v := Actions.(type) {
case string:
// handle string case
case []interface{}:
theActions := sortInterfaceStrings(v)
if theActions != nil {
blocked["Action"] = theActions
}
default:
log.Print(reflect.TypeOf(v).Kind())
}
NewStatements = append(NewStatements, block)
}
if NewStatements != nil {
raw["Statement"] = NewStatements
}
fixed, err := json.Marshal(raw)
if err != nil {
return nil, &marshallPolicyError{err}
}
result := string(fixed)
return &result, nil
}
func sortInterfaceStrings(actions interface{}) []string {
temp, ok := actions.([]interface{})
if !ok {
log.Info().Msgf("failed to assert list for actions")
return nil
}
myActions := make([]string, len(temp))
for index, action := range temp {
myAction, ok := action.(string)
if !ok {
log.Info().Msgf("failed to convert to string %s", action)
continue
}
myActions[index] = myAction
}
sort.Strings(myActions)
return myActions
}
type getVersionError struct {
err error
}
func (e *getVersionError) Error() string {
return fmt.Sprintf("failed to get version %v", e.err)
}
type waitForPolicyChangeError struct {
err error
}
func (e *waitForPolicyChangeError) Error() string {
return fmt.Sprintf("failed to wait for policy change %v", e.err)
}