feat(aws-codebuild): allow using docker image assets as build images

This change enables using Docker assets as CodeBuild images.

In order to enable that, a few changes were required in how Docker assets
are modeled:

Extracted a low-level `DockerImageAsset` class into a new module called
@aws-cdk/assets-docker. This module provides the basic interaction with
the toolkit and allows higher level APIs such as ECR or CodeBuild to
manage permissions on the asset repository.

Since CodeBuild needs permissions at the resource policy level (since
images are not pulled via an assumed role), the adopted repository
custom resource was extended to support specifying an arbitrary policy
document for the repository. This is made available via an overload of
`addToResourcePolicy` implemented by `AdoptedRepository`.

In order to fix #1232 and simplify, the protocol between the toolkit and
the asset class have been changed to only pass in the _repository name_
and the _tag_ (together). Previously the ARN of the repository was used,
but it is impossible to parse the repository name from the ARN using
CFN's split/select. It is possible to produce the ARN from a name, and
the repository is ensured to be "local" to the account/region.

Modernized ECR import/export and converted `RepositoryRef` to `IRepository`,
and modified `ImportedRepository` to only parse the repository name from 
ARN in case the ARN is concrete (not a token). Otherwise, the name is
also required.

Renamed `grantUseImage` to `grantPull` and added `grantPullPush`.

Added `repositoryUriForTag(tag)`.

Fixes #1219

BREAKING CHANGE: `ecr.RepositoryRef` has been replaced by `ecr.IRepository`, which
means that `RepositoryRef.import` is now `Repository.import`. Futhermore, the CDK 
Toolkit must also be upgraded since the docker asset protocol was modified. 
`IRepository.grantUseImage` was renamed to `IRepository.grantPull`.

docs/src/assets.rst

@@ -9,20 +9,21 @@
    limitations under the License.
 
 .. _assets:
-   
+
 ######
 Assets
 ######
 
-Assets are local files or directories which can be bundled into CDK constructs
-and apps. A common example is a directory which contains the handler code for an
-AWS Lambda function, but assets can represent any artifact that is needed for
-the app’s operation.
+Assets are local files, directories or docker images which can be bundled into
+CDK constructs and apps. A common example is a directory which contains the
+handler code for an AWS Lambda function, but assets can represent any artifact
+that is needed for the app’s operation.
 
 When deploying an AWS CDK app that includes constructs with assets, the toolkit
-will first upload all the assets to S3, and only then deploy the stacks. The S3
-locations of the uploaded assets will be passed in as CloudFormation Parameters
+will first prepare and publish them to S3 or ECR, and only then deploy the stacks.
+The locations of the published assets will be passed in as CloudFormation Parameters
 to the relevant stacks.
 
-For more details, see the :py:doc:`Assets <refs/_aws-cdk_assets>` library documentation.
-
+See :py:doc:`Assets <refs/_aws-cdk_assets>` for documentation about file assets
+and :py:doc:`Docker Assets <refs/_aws-assets_docker>` for documentation about 
+Docker image assets.

packages/@aws-cdk/assets-docker/.gitignore

@@ -0,0 +1,17 @@
+*.js
+*.js.map
+*.d.ts
+node_modules
+dist
+tsconfig.json
+tslint.json
+
+.LAST_BUILD
+.nyc_output
+coverage
+
+.jsii
+
+.nycrc
+.LAST_PACKAGE
+*.snk

packages/@aws-cdk/assets-docker/.npmignore

@@ -0,0 +1,16 @@
+# Don't include original .ts files when doing `npm pack`
+*.ts
+!*.d.ts
+coverage
+.nyc_output
+*.tgz
+
+dist
+.LAST_PACKAGE
+.LAST_BUILD
+!*.js
+
+# Include .jsii
+!.jsii
+
+*.snk

packages/@aws-cdk/assets-docker/LICENSE

@@ -0,0 +1,201 @@
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packages/@aws-cdk/assets-docker/NOTICE

@@ -0,0 +1,2 @@
+AWS Cloud Development Kit (AWS CDK)
+Copyright 2018-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.

packages/@aws-cdk/assets-docker/README.md

@@ -0,0 +1,38 @@
+# AWS CDK Docker Image Assets
+
+This module allows bundling Docker images as assets.
+
+Images are built from a local Docker context directory (with a `Dockerfile`),
+uploaded to ECR by the CDK toolkit and/or your app's CI-CD pipeline, and can be
+naturally referenced in your CDK app.
+
+```typescript
+import { DockerImageAsset } from '@aws-cdk/assets-docker';
+
+const asset = new DockerImageAsset(this, 'MyBuildImage', {
+  directory: path.join(__dirname, 'my-image')
+});
+```
+
+The directory `my-image` must include a `Dockerfile`.
+
+This will instruct the toolkit to build a Docker image from `my-image`, push it
+to an AWS ECR repository and wire the name of the repository as CloudFormation
+parameters to your stack.
+
+Use `asset.imageUri` can be used to reference the image (it includes both the
+ECR image URL and tag.
+
+### Pull Permissions
+
+Depending on the consumer of your image asset, you will need to make sure
+the principal has permissions to pull the image.
+
+In most cases, you should use the `asset.repository.grantPull(principal)`
+method. This will modify the IAM policy of the principal to allow it to
+pull images from this repository.
+
+If the pulling principal is not in the same account or is an AWS service that
+doesn't assume a role in your account (e.g. AWS CodeBuild), pull permissions
+must be granted on the __resource policy__ (and not on the principal's policy).
+To do that, you can use `asset.repository.addToResourcePolicy(statement)`.

packages/@aws-cdk/assets-docker/lib/adopt-repository/.gitignore

@@ -0,0 +1 @@
+!*.js

packages/@aws-cdk/aws-ecs/lib/images/adopt-repository/handler.js → packages/@aws-cdk/assets-docker/lib/adopt-repository/handler.js

@@ -13,8 +13,8 @@ exports.handler = async function(event, context, _callback, respond) {
       Principal: "*"
     };
 
-    function repoName(props) {
-      return props.RepositoryArn.split('/').slice(1).join('/');
+    function repoName(arn) {
+      return arn.split('/').slice(1).join('/');
     }
 
     // The repository must already exist
@@ -30,7 +30,7 @@ exports.handler = async function(event, context, _callback, respond) {
       }
     }
 
-    const repo = repoName(event.ResourceProperties);
+    const repo = repoName(event.ResourceProperties.RepositoryArn);
     const adopter = await getAdopter(repo);
     if (event.RequestType === 'Delete') {
       if (adopter.Sid !== markerStatement.Sid) {
@@ -51,16 +51,33 @@ exports.handler = async function(event, context, _callback, respond) {
         throw new Error(`This repository is already owned by another stack: ${adopter.Sid}`);
       }
       console.log('Adopting', repo);
-      await ecr.setRepositoryPolicy({ repositoryName: repo, policyText: JSON.stringify({
+
+      const policy = event.ResourceProperties.PolicyDocument || {
         Version: '2008-10-17',
-        Statement: [markerStatement]
-      }) }).promise();
+        Statement: [ ]
+      };
+
+      if (!policy.Version) {
+        policy.Version = '2008-10-17';
+      }
+
+      if (!policy.Statement) {
+        policy.Statement = [ ];
+      }
+
+      if (!Array.isArray(policy.Statement)) {
+        policy.Statement = [ policy.Statement ];
+      }
+
+      policy.Statement.push(markerStatement);
+
+      console.log('policy document:', JSON.stringify(policy, undefined, 2));
+
+      await ecr.setRepositoryPolicy({ repositoryName: repo, policyText: JSON.stringify(policy) }).promise();
     }
 
     const arn = event.ResourceProperties.RepositoryArn.split(':');
-    await respond("SUCCESS", "OK", repo, {
-      RepositoryUri: `${arn[4]}.dkr.ecr.${arn[3]}.amazonaws.com/${repoName(event.ResourceProperties)}`
-    });
+    await respond("SUCCESS", "OK", repo, {});
   } catch (e) {
     console.log(e);
     await respond("FAILED", e.message, context.logStreamName, {});