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fix(dynamodb): replication regions are incompatible with resource policies in TableV2 #31097

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fix(dynamodb): replication regions are incompatible with resource policies in TableV2 #31097

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da7c863
Fix - Resource base policy for replica tables
Aug 13, 2024
7c74c78
Fix - Added integ tests
Aug 13, 2024
35db782
Merge branch 'main' into rbp-fix-lhnng
LeeroyHannigan Aug 13, 2024
4accd0f
Removing comments from table-v2
Aug 21, 2024
ce9f776
Added feature flag for resource policy
Aug 28, 2024
5721dd6
Adding feature flag to cx-api
Aug 28, 2024
8cfe236
Update integ test
Aug 28, 2024
da181c8
Merge branch 'main' into rbp-fix-lhnng
LeeroyHannigan Aug 28, 2024
973a379
Update features.ts to remove blank space
LeeroyHannigan Aug 28, 2024
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5 changes: 3 additions & 2 deletions packages/aws-cdk-lib/aws-dynamodb/lib/table-v2.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -664,8 +664,9 @@ export class TableV2 extends TableBaseV2 {
private configureReplicaTable(props: ReplicaTableProps): CfnGlobalTable.ReplicaSpecificationProperty {
const pointInTimeRecovery = props.pointInTimeRecovery ?? this.tableOptions.pointInTimeRecovery;
const contributorInsights = props.contributorInsights ?? this.tableOptions.contributorInsights;
const resourcePolicy = props.resourcePolicy ?? this.tableOptions.resourcePolicy;

//const resourcePolicy = props.resourcePolicy ?? this.tableOptions.resourcePolicy;
//const resourcePolicy = props.resourcePolicy;
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const resourcePolicy = (props.region === this.region ? this.tableOptions.resourcePolicy : props.resourcePolicy) || undefined;
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This is a breaking change for existing users. If existing users manage to bypass the CFN error by using escape hatch. They then remove the escape hatch and upgrade to a version that includes this change, their replication region will now have the resource policies removed, thus this is not an acceptable change. I would recommend you to do it following the suggested proposal in the original issue.

Ideally, the construct could allow null and when null is specified in a specific replica, no resourcePolicy is added to that replica even when one is defined in the TableV2 itself

new TableV2(this, `MyTable-${stage}`, {
      pointInTimeRecovery: true,
      partitionKey: {
        name: 'key',
        type: AttributeType.STRING,
      },
      tableName: 'MyTable',
      // us-east-2 should not have tablePolicyDocument added in the template
      replicas: [{ region: 'us-east-1' }, { region: 'us-east-2', resourcePolicy: null }], 
      resourcePolicy: tablePolicyDocument,
    });

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This is forcing a user to add null for when they don't want a resource policy. The default implementation should only require them to add a policy to a replica should the want it. It shouldn't default to adding it to all replicas.

return {
region: props.region,
globalSecondaryIndexes: this.configureReplicaGlobalSecondaryIndexes(props.globalSecondaryIndexOptions),
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178 changes: 178 additions & 0 deletions packages/aws-cdk-lib/aws-dynamodb/test/table-v2.test.ts
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Expand Up @@ -3007,4 +3007,182 @@ test('Resource policy test', () => {
},
],
});
});

test('Add resource policy to local table only', () => {
// GIVEN
const stack = new Stack(undefined, 'Stack', { env: { region: 'eu-west-1' } });

const doc = new PolicyDocument({
statements: [
new PolicyStatement({
actions: ['dynamodb:GetItem'],
principals: [new ArnPrincipal('arn:aws:iam::111122223333:user/foobar')],
resources: ['*'],
}),
],
});

// WHEN
const table = new TableV2(stack, 'Table', {
partitionKey: { name: 'metric', type: AttributeType.STRING },
resourcePolicy: doc,
replicas: [{
region: 'eu-west-2',
}],
});

// THEN
Template.fromStack(stack).hasResourceProperties('AWS::DynamoDB::GlobalTable', {
Replicas: [
{
Region: 'eu-west-2',
},
{
Region: 'eu-west-1',
ResourcePolicy: {
PolicyDocument: {
Statement: [
{
Action: 'dynamodb:GetItem',
Effect: 'Allow',
Principal: {
AWS: 'arn:aws:iam::111122223333:user/foobar',
},
Resource: '*',
},
],
Version: '2012-10-17',
},
},
},
],
});
});

test('Add resource policy to replica table only', () => {
// GIVEN
const stack = new Stack(undefined, 'Stack', { env: { region: 'eu-west-1' } });

const doc = new PolicyDocument({
statements: [
new PolicyStatement({
actions: ['dynamodb:GetItem'],
principals: [new ArnPrincipal('arn:aws:iam::111122223333:user/foobar')],
resources: ['*'],
}),
],
});

// WHEN
const table = new TableV2(stack, 'Table', {
partitionKey: { name: 'metric', type: AttributeType.STRING },
replicas: [{
region: 'eu-west-2',
resourcePolicy: doc,
}],
});

// THEN
Template.fromStack(stack).hasResourceProperties('AWS::DynamoDB::GlobalTable', {
Replicas: [
{
Region: 'eu-west-2',
ResourcePolicy: {
PolicyDocument: {
Statement: [
{
Action: 'dynamodb:GetItem',
Effect: 'Allow',
Principal: {
AWS: 'arn:aws:iam::111122223333:user/foobar',
},
Resource: '*',
},
],
Version: '2012-10-17',
},
},
},
{
Region: 'eu-west-1',
},
],
});
});

test('Add two different resource policies to replicas', () => {
// GIVEN
const stack = new Stack(undefined, 'Stack', { env: { region: 'eu-west-1' } });

const doc1 = new PolicyDocument({
statements: [
new PolicyStatement({
actions: ['dynamodb:GetItem'],
principals: [new ArnPrincipal('arn:aws:iam::111122223333:user/foobar')],
resources: ['*'],
}),
],
});
const doc2 = new PolicyDocument({
statements: [
new PolicyStatement({
actions: ['dynamodb:DeleteItem'],
principals: [new ArnPrincipal('arn:aws:iam::111122223333:user/barfoo')],
resources: ['*'],
}),
],
});

// WHEN
const table = new TableV2(stack, 'Table', {
partitionKey: { name: 'metric', type: AttributeType.STRING },
resourcePolicy: doc1,
replicas: [{
region: 'eu-west-2',
resourcePolicy: doc2,
}],
});

// THEN
Template.fromStack(stack).hasResourceProperties('AWS::DynamoDB::GlobalTable', {
Replicas: [
{
Region: 'eu-west-2',
ResourcePolicy: {
PolicyDocument: {
Statement: [
{
Action: 'dynamodb:DeleteItem',
Effect: 'Allow',
Principal: {
AWS: 'arn:aws:iam::111122223333:user/barfoo',
},
Resource: '*',
},
],
Version: '2012-10-17',
},
},
},
{
Region: 'eu-west-1',
ResourcePolicy: {
PolicyDocument: {
Statement: [
{
Action: 'dynamodb:GetItem',
Effect: 'Allow',
Principal: {
AWS: 'arn:aws:iam::111122223333:user/foobar',
},
Resource: '*',
},
],
Version: '2012-10-17',
},
}
},
],
});
});
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