Prescriptions API

Versions and deployments

Version release history can be found ot https://github.com/NHSDigital/prescriptionsforpatients/releases. We use eslint convention for commit messages for commits to main branch. Descriptions for the types of changes in a release can be found in the contributing guidelines.
Deployment history can be found at https://nhsdigital.github.io/prescriptionsforpatients/

Introduction

This is the AWS layer that provides an API for accessing prescription information for a patient.
It is called by an Apigee proxy that is defined at https://github.com/NHSDigital/prescriptions-for-patients

• packages/getMyPrescriptions/ Get prescription details for /Bundle endpoint.
• packages/enrichPrescriptions/ Get prescription status updates for prescriptions retrieved by getMyPrescriptions.
• packages/nhsd-pfp-sandbox/ Returns static data from the Sandbox.
• packages/statusLambda/ Returns the status of the getMyPrescriptions endpoint.
• packages/capabilityStatement/ Returns a static capability statement.
• packages/serviceSearchClient/ Module for connecting to service search.
• packages/distanceSelling/ Module for using Service Search client and enriching the data being returned.
• packages/common/utilities Module containing commonly referenced functions, data types and configuration data.
• packages/common/testing Module that contains some test data used for tests in other modules.
• postman/ Contains a postman collection for interacting with the API.
• scripts/ Utilities helpful to developers of this specification.
• cloudformation/ Contains cloudformation files used to create resources for CI builds and deployments.
• SAMtemplates/ Contains the SAM templates used to define the stacks.
• privateCA/ Contains script to create self signed CA certificate and a client certificate used for mutual TLS.
• .github Contains github workflows that are used for building and deploying from pull requests and releases.
• .devcontainer Contains a dockerfile and vscode devcontainer definition.
• .vscode Contains vscode workspace file.
• .releaserc semantic-release config file

Consumers of the API will find developer documentation on the NHS Digital Developer Hub.

Contributing

Contributions to this project are welcome from anyone, providing that they conform to the guidelines for contribution and the community code of conduct.

Licensing

This code is dual licensed under the MIT license and the OGL (Open Government License). Any new work added to this repository must conform to the conditions of these licenses. In particular this means that this project may not depend on GPL-licensed or AGPL-licensed libraries, as these would violate the terms of those libraries' licenses.

The contents of this repository are protected by Crown Copyright (C).

Development

It is recommended that you use visual studio code and a devcontainer as this will install all necessary components and correct versions of tools and languages.
See https://code.visualstudio.com/docs/devcontainers/containers for details on how to set this up on your host machine.
There is also a workspace file in .vscode that should be opened once you have started the devcontainer. The workspace file can also be opened outside of a devcontainer if you wish.
The project uses SAM to develop and deploy the APIs and associated resources.

All commits must be made using signed commits

Once the steps at the link above have been completed. Add to your ~/.gnupg/gpg.conf as below:

use-agent
pinentry-mode loopback

and to your ~/.gnupg/gpg-agent.conf as below:

allow-loopback-pinentry

As described here: https://stackoverflow.com/a/59170001

You will need to create the files, if they do not already exist. This will ensure that your VSCode bash terminal prompts you for your GPG key password.

You can cache the gpg key passphrase by following instructions at https://superuser.com/questions/624343/keep-gnupg-credentials-cached-for-entire-user-session

SAM setup and usage

SAM allows rapid local development and deployment to AWS for development and testing.

Setup

Ensure you have the following lines in the file .envrc

export AWS_DEFAULT_PROFILE=prescription-dev
export stack_name=<UNIQUE_NAME_FOR_YOU>
export TARGET_SPINE_SERVER=<NAME OF DEV TARGET SPINE SERVER>
export TARGET_SERVICE_SEARCH_SERVER=<NAME OF DEV TARGET SERVICE SEARCH SERVER>

UNIQUE_NAME_FOR_YOU should be a unique name for you with no underscores in it - eg anthony-brown-1

Once you have saved .envrc, start a new terminal in vscode and run this command to authenticate against AWS

make aws-configure

Put the following values in:

SSO session name (Recommended): sso-session
SSO start URL [None]: <USE VALUE OF SSO START URL FROM AWS LOGIN COMMAND LINE ACCESS INSTRUCTIONS ACCESSED FROM https://myapps.microsoft.com>
SSO region [None]: eu-west-2
SSO registration scopes [sso:account:access]:

This will then open a browser window and you should authenticate with your hscic credentials You should then select the development account and set default region to be eu-west-2.

You will now be able to use AWS and SAM CLI commands to access the dev account. You can also use the AWS extension to view resources.

When the token expires, you may need to reauthorise using make aws-login

CI Setup

The GitHub Actions require a secret to exist on the repo called "SONAR_TOKEN". This can be obtained from SonarCloud as described here. You will need the "Execute Analysis" permission for the project (NHSDigital_prescriptionsforpatients) in order for the token to work.

GitHub Packages Setup

To work with the GitHub Package Registry, you need to generate a personal access token (classic) with appropriate permissions.

Follow these steps:

• Generate a personal access token (classic)

  • Go to your GitHub account settings and navigate to "Developer settings" > "Personal access tokens". Select the "Tokens(classic)" from the left bar.
  • Click on the "Generate a personal access token" link and select the read:packages scope. Ensure the token has no expiration.

• Authorize a personal access token for use with SAML single sign-on

  • Click "Configure SSO". If you don't see this option, ensure that you have authenticated at least once through your SAML IdP to access resources on GitHub.com
  • In the dropdown menu, to the right of the organization you'd like to authorize the token for, click "Authorize".

• Authenticating with a personal access token in to npm

  • To authenticate with npm, use the following command, replacing USERNAME with your GitHub username, TOKEN with your personal access token (classic), and PUBLIC-EMAIL-ADDRESS with your email address.

$ npm login --scope=@NHSDigital --auth-type=legacy --registry=https://npm.pkg.github.com
> Username: USERNAME
> Password: TOKEN

Continuous deployment for testing

You can run the following command to deploy the code to AWS for testing

make sam-sync

This will take a few minutes to deploy - you will see something like this when deployment finishes

......
CloudFormation events from stack operations (refresh every 0.5 seconds)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
ResourceStatus                            ResourceType                              LogicalResourceId                         ResourceStatusReason
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
.....
CREATE_IN_PROGRESS                        AWS::ApiGatewayV2::ApiMapping             HttpApiGatewayApiMapping                  -
CREATE_IN_PROGRESS                        AWS::ApiGatewayV2::ApiMapping             HttpApiGatewayApiMapping                  Resource creation Initiated
CREATE_COMPLETE                           AWS::ApiGatewayV2::ApiMapping             HttpApiGatewayApiMapping                  -
CREATE_COMPLETE                           AWS::CloudFormation::Stack                ab-1                                      -
---------------------------------------------------------------------------------------------------------------------------------------------------------------------


Stack creation succeeded. Sync infra completed.

Note - the command will keep running and should not be stopped. You can now call this api - note getMyPrescriptions requires an nhsd-nhslogin-user header

curl --header "nhsd-nhslogin-user: P9:9446041481" https://${stack_name}.dev.prescriptionsforpatients.national.nhs.uk/Bundle

You can also use the AWS vscode extension to invoke the API or lambda directly

Any code changes you make are automatically uploaded to AWS while make sam-sync is running allowing you to quickly test any changes you make

Pre-commit hooks

Some pre-commit hooks are installed as part of the install above, to run basic lint checks and ensure you can't accidentally commit invalid changes. The pre-commit hook uses python package pre-commit and is configured in the file .pre-commit-config.yaml. A combination of these checks are also run in CI.

Make commands

There are make commands that are run as part of the CI pipeline and help alias some functionality during development.

install targets

• install-node installs node dependencies
• install-python installs python dependencies
• install-hooks installs git pre commit hooks
• install runs all install targets

SAM targets

These are used to do common commands

• sam-build prepares the lambdas and SAM definition file to be used in subsequent steps
• sam-run-local run the API and lambdas locally
• sam-sync sync the API and lambda to AWS. This keeps running and automatically uploads any changes to lambda code made locally. Needs AWS_DEFAULT_PROFILE, stack_name, TARGET_SERVICE_SEARCH_SERVER and TARGET_SPINE_SERVER environment variables set.
• sam-sync-sandbox sync the API and lambda to AWS. This keeps running and automatically uploads any changes to lambda code made locally. Needs stack_name environment variables set, the path and file name where the AWS SAM template is located.
• sam-deploy deploys the compiled SAM template from sam-build to AWS. Needs AWS_DEFAULT_PROFILE and stack_name environment variables set.
• sam-delete deletes the deployed SAM cloud formation stack and associated resources. Needs AWS_DEFAULT_PROFILE and stack_name environment variables set.
• sam-list-endpoints lists endpoints created for the current stack. Needs AWS_DEFAULT_PROFILE and stack_name environment variables set.
• sam-list-resources lists resources created for the current stack. Needs AWS_DEFAULT_PROFILE and stack_name environment variables set.
• sam-list-outputs lists outputs from the current stack. Needs AWS_DEFAULT_PROFILE and stack_name environment variables set.
• sam-validate validates the main SAM template and the splunk firehose template.
• sam-validate-sandbox validates the sandbox SAM template and the splunk firehose template.
• sam-deploy-package deploys a package created by sam-build. Used in CI builds. Needs the following environment variables set
  • artifact_bucket - bucket where uploaded packaged files are
  • artifact_bucket_prefix - prefix in bucket of where uploaded packaged files ore
  • stack_name - name of stack to deploy
  • template_file - name of template file created by sam-package
  • cloud_formation_execution_role - ARN of role that cloud formation assumes when applying the changeset

Download secrets

• download-get-secrets-layer creates the necessary directory structure and downloads the get-secrets-layer.zip artifact from NHSDigital's electronic-prescription-service-get-secrets releases

Clean and deep-clean targets

• clean clears up any files that have been generated by building or testing locally.
• deep-clean runs clean target and also removes any node_modules and python libraries installed locally.

Linting and testing

• lint runs lint for all code
• lint-node runs lint for node code
• lint-cloudformation runs lint for cloudformation templates
• lint-samtemplates runs lint for SAM templates
• test runs unit tests for all code
• cfn-guard runs cfn-guard for sam and cloudformation templates

Compiling

• compile compiles all code
• compile-node runs tsc to compile typescript code

Check licenses

• check-licenses checks licenses for all packages used - calls check-licenses-node, check-licenses-python, check-licenses-golang
• check-licenses-node checks licenses for all node code
• check-licenses-python checks licenses for all python code

CLI Login to AWS

• aws-configure configures a connection to AWS
• aws-login reconnects to AWS from a previously configured connection

Github folder

This .github folder contains workflows and templates related to github

• pull_request_template.yml: Template for pull requests.

Workflows are in the .github/workflows folder

• ci.yml Workflow run when code merged to main. Deploys to dev and qa environments.
• combine-dependabot-prs.yml: Workflow for combining dependabot pull requests. Runs on demand
• delete_old_cloudformation_stacks.yml: Workflow for deleting old cloud formation stacks. Runs daily
• pull_request.yml: Called when pull request is opened or updated. Calls sam_package_code and sam_release_code to build and deploy the code. Deploys to dev AWS account. The main and sandbox stacks deployed have PR-<PULL_REQUEST_ID> in the name
• release.yml: Runs on demand to create a release and deploy to all environments.
• sam_package_code.yml: Packages code and uploads to a github artifact for later deployment
• sam_release_code.yml: Release code built by sam_package_code.yml to an environment
• pr-link.yaml: This workflow template links Pull Requests to Jira tickets and runs when a pull request is opened.
• dependabot.yml: Dependabot definition file

Github pages

Github pages is used to display deployment information. The source for github pages is in the gh-pages branch. As part of the ci and release workflows, the release tag (either the short commit SHA or release tag) is appended to _data/{environment}_deployments.csv so we have a history of releases and replaced in _data/{environment}_latest.csv so we now what the latest released version is. There are different makefile targets in this branch. These are

• run-jekyll - runs the site locally so changes can be previewed during development
• sync-main - syncs common files from main branch to gh-pages branch. You must commit and push after running this
• install-python installs python dependencies
• install-hooks installs git pre commit hooks
• install-node installs node dependencies
• install-jekyll installs dependencies to be able to run jekyll locally
• install runs all install targets