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resource_aws_lambda_permission.go
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resource_aws_lambda_permission.go
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package aws
import (
"encoding/json"
"fmt"
"log"
"regexp"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/lambda"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
)
var LambdaFunctionRegexp = `^(arn:[\w-]+:lambda:)?([a-z]{2}-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?$`
func resourceAwsLambdaPermission() *schema.Resource {
return &schema.Resource{
Create: resourceAwsLambdaPermissionCreate,
Read: resourceAwsLambdaPermissionRead,
Delete: resourceAwsLambdaPermissionDelete,
Schema: map[string]*schema.Schema{
"action": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
ValidateFunc: validateLambdaPermissionAction,
},
"function_name": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
ValidateFunc: validateLambdaFunctionName,
},
"principal": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"qualifier": {
Type: schema.TypeString,
Optional: true,
ForceNew: true,
ValidateFunc: validateLambdaQualifier,
},
"source_account": {
Type: schema.TypeString,
Optional: true,
ForceNew: true,
ValidateFunc: validateAwsAccountId,
},
"source_arn": {
Type: schema.TypeString,
Optional: true,
ForceNew: true,
ValidateFunc: validateArn,
},
"statement_id": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
ValidateFunc: validatePolicyStatementId,
},
},
}
}
func resourceAwsLambdaPermissionCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).lambdaconn
functionName := d.Get("function_name").(string)
// There is a bug in the API (reported and acknowledged by AWS)
// which causes some permissions to be ignored when API calls are sent in parallel
// We work around this bug via mutex
awsMutexKV.Lock(functionName)
defer awsMutexKV.Unlock(functionName)
input := lambda.AddPermissionInput{
Action: aws.String(d.Get("action").(string)),
FunctionName: aws.String(functionName),
Principal: aws.String(d.Get("principal").(string)),
StatementId: aws.String(d.Get("statement_id").(string)),
}
if v, ok := d.GetOk("qualifier"); ok {
input.Qualifier = aws.String(v.(string))
}
if v, ok := d.GetOk("source_account"); ok {
input.SourceAccount = aws.String(v.(string))
}
if v, ok := d.GetOk("source_arn"); ok {
input.SourceArn = aws.String(v.(string))
}
log.Printf("[DEBUG] Adding new Lambda permission: %s", input)
var out *lambda.AddPermissionOutput
err := resource.Retry(1*time.Minute, func() *resource.RetryError {
var err error
out, err = conn.AddPermission(&input)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
// IAM is eventually consistent :/
if awsErr.Code() == "ResourceConflictException" {
return resource.RetryableError(
fmt.Errorf("[WARN] Error adding new Lambda Permission for %s, retrying: %s",
*input.FunctionName, err))
}
}
return resource.NonRetryableError(err)
}
return nil
})
if err != nil {
return err
}
if out != nil && out.Statement != nil {
log.Printf("[DEBUG] Created new Lambda permission: %s", *out.Statement)
} else {
log.Printf("[DEBUG] Created new Lambda permission, but no Statement was included")
}
d.SetId(d.Get("statement_id").(string))
err = resource.Retry(5*time.Minute, func() *resource.RetryError {
// IAM is eventually cosistent :/
err := resourceAwsLambdaPermissionRead(d, meta)
if err != nil {
if strings.HasPrefix(err.Error(), "Error reading Lambda policy: ResourceNotFoundException") {
return resource.RetryableError(
fmt.Errorf("[WARN] Error reading newly created Lambda Permission for %s, retrying: %s",
*input.FunctionName, err))
}
if strings.HasPrefix(err.Error(), "Failed to find statement \""+d.Id()) {
return resource.RetryableError(
fmt.Errorf("[WARN] Error reading newly created Lambda Permission statement for %s, retrying: %s",
*input.FunctionName, err))
}
log.Printf("[ERROR] An actual error occurred when expecting Lambda policy to be there: %s", err)
return resource.NonRetryableError(err)
}
return nil
})
return err
}
func resourceAwsLambdaPermissionRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).lambdaconn
input := lambda.GetPolicyInput{
FunctionName: aws.String(d.Get("function_name").(string)),
}
if v, ok := d.GetOk("qualifier"); ok {
input.Qualifier = aws.String(v.(string))
}
log.Printf("[DEBUG] Looking for Lambda permission: %s", input)
var out *lambda.GetPolicyOutput
var statement *LambdaPolicyStatement
err := resource.Retry(1*time.Minute, func() *resource.RetryError {
// IAM is eventually cosistent :/
var err error
out, err = conn.GetPolicy(&input)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "ResourceNotFoundException" {
return resource.RetryableError(err)
}
}
return resource.NonRetryableError(err)
}
policyInBytes := []byte(*out.Policy)
policy := LambdaPolicy{}
err = json.Unmarshal(policyInBytes, &policy)
if err != nil {
return resource.NonRetryableError(err)
}
statement, err = findLambdaPolicyStatementById(&policy, d.Id())
return resource.RetryableError(err)
})
if err != nil {
// Missing whole policy or Lambda function (API error)
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "ResourceNotFoundException" {
log.Printf("[WARN] No Lambda Permission Policy found: %v", input)
d.SetId("")
return nil
}
}
// Missing permission inside valid policy
if nfErr, ok := err.(*resource.NotFoundError); ok {
log.Printf("[WARN] %s", nfErr)
d.SetId("")
return nil
}
return err
}
qualifier, err := getQualifierFromLambdaAliasOrVersionArn(statement.Resource)
if err != nil {
log.Printf("[ERR] Error getting Lambda Qualifier: %s", err)
}
d.Set("qualifier", qualifier)
// Save Lambda function name in the same format
if strings.HasPrefix(d.Get("function_name").(string), "arn:"+meta.(*AWSClient).partition+":lambda:") {
// Strip qualifier off
trimmedArn := strings.TrimSuffix(statement.Resource, ":"+qualifier)
d.Set("function_name", trimmedArn)
} else {
functionName, err := getFunctionNameFromLambdaArn(statement.Resource)
if err != nil {
return err
}
d.Set("function_name", functionName)
}
d.Set("action", statement.Action)
// Check if the pricipal is a cross-account IAM role
if _, ok := statement.Principal["AWS"]; ok {
d.Set("principal", statement.Principal["AWS"])
} else {
d.Set("principal", statement.Principal["Service"])
}
if stringEquals, ok := statement.Condition["StringEquals"]; ok {
d.Set("source_account", stringEquals["AWS:SourceAccount"])
}
if arnLike, ok := statement.Condition["ArnLike"]; ok {
d.Set("source_arn", arnLike["AWS:SourceArn"])
}
return nil
}
func resourceAwsLambdaPermissionDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).lambdaconn
functionName := d.Get("function_name").(string)
// There is a bug in the API (reported and acknowledged by AWS)
// which causes some permissions to be ignored when API calls are sent in parallel
// We work around this bug via mutex
awsMutexKV.Lock(functionName)
defer awsMutexKV.Unlock(functionName)
input := lambda.RemovePermissionInput{
FunctionName: aws.String(functionName),
StatementId: aws.String(d.Id()),
}
if v, ok := d.GetOk("qualifier"); ok {
input.Qualifier = aws.String(v.(string))
}
log.Printf("[DEBUG] Removing Lambda permission: %s", input)
_, err := conn.RemovePermission(&input)
if err != nil {
return err
}
err = resource.Retry(5*time.Minute, func() *resource.RetryError {
log.Printf("[DEBUG] Checking if Lambda permission %q is deleted", d.Id())
params := &lambda.GetPolicyInput{
FunctionName: aws.String(d.Get("function_name").(string)),
}
if v, ok := d.GetOk("qualifier"); ok {
params.Qualifier = aws.String(v.(string))
}
log.Printf("[DEBUG] Looking for Lambda permission: %s", *params)
resp, err := conn.GetPolicy(params)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "ResourceNotFoundException" {
return nil
}
}
return resource.NonRetryableError(err)
}
if resp.Policy == nil {
return nil
}
policyInBytes := []byte(*resp.Policy)
policy := LambdaPolicy{}
err = json.Unmarshal(policyInBytes, &policy)
if err != nil {
return resource.RetryableError(
fmt.Errorf("Error unmarshalling Lambda policy: %s", err))
}
_, err = findLambdaPolicyStatementById(&policy, d.Id())
if err != nil {
return nil
}
log.Printf("[DEBUG] No error when checking if Lambda permission %s is deleted", d.Id())
return nil
})
if err != nil {
return fmt.Errorf("Failed removing Lambda permission: %s", err)
}
log.Printf("[DEBUG] Lambda permission with ID %q removed", d.Id())
d.SetId("")
return nil
}
func findLambdaPolicyStatementById(policy *LambdaPolicy, id string) (
*LambdaPolicyStatement, error) {
log.Printf("[DEBUG] Received %d statements in Lambda policy: %s", len(policy.Statement), policy.Statement)
for _, statement := range policy.Statement {
if statement.Sid == id {
return &statement, nil
}
}
return nil, &resource.NotFoundError{
LastRequest: id,
LastResponse: policy,
Message: fmt.Sprintf("Failed to find statement %q in Lambda policy:\n%s", id, policy.Statement),
}
}
func getQualifierFromLambdaAliasOrVersionArn(arn string) (string, error) {
matches := regexp.MustCompile(LambdaFunctionRegexp).FindStringSubmatch(arn)
if len(matches) < 8 || matches[7] == "" {
return "", fmt.Errorf("Invalid ARN or otherwise unable to get qualifier from ARN (%q)",
arn)
}
return matches[7], nil
}
func getFunctionNameFromLambdaArn(arn string) (string, error) {
matches := regexp.MustCompile(LambdaFunctionRegexp).FindStringSubmatch(arn)
if len(matches) < 6 || matches[5] == "" {
return "", fmt.Errorf("Invalid ARN or otherwise unable to get qualifier from ARN (%q)",
arn)
}
return matches[5], nil
}
type LambdaPolicy struct {
Version string
Statement []LambdaPolicyStatement
Id string
}
type LambdaPolicyStatement struct {
Condition map[string]map[string]string
Action string
Resource string
Effect string
Principal map[string]string
Sid string
}