ipv-core-front

This repository contains the source code for the frontend user interface of the GOV.UK One Login Identity Proofing and Verification (IPV) system. The IPV Core frontend is the first user-facing screen in the identity proving journey.

Related repositories

ipv-core-front works with the following IPV Core repositories:

• ipv-core-back - backend code
• ipv-core-tests - feature tests
• ipv-core-common-infra - utilities that automate IPV Core ancillary services
• ipv-stubs - test stubs for IPV Core dependencies (credential issuers)

Kiro

Kiro is Amazon's coding assistant AI, currently, as part of the AI experiment, we are allowed to use the command line version kiro-cli. This project includes a .kiro folder that contains markdown files designed to give Kiro high level context about the project to help it make suggestions that work with the existing design decisions. This folder is committed so that all developers on the team can improvae and benefit from the steering information (https://kiro.dev/docs/cli/steering/).

Developing ipv-core-front

This guide explains how to:

• clone the repo and install the dependencies
• run ipv-core-front locally
• use pre-commit to verify your commits
• creating a new page

Cloning and installing ipv-core-front

1. Clone this repository to your local machine:

https://github.com/govuk-one-login/ipv-core-front.git

1. Change into the ipv-core-front folder.
2. [Create a GitHub personal access token][create-pat] with package:read scope
3. Copy .npmrc.template to .npmrc and replace TOKEN_WITH_READ_PACKAGE_PERMISSION with your personal access token
4. Run the following command to install the project dependencies:

npm install

Dependencies on govuk-one-login-frontend

We import common components, functions and middleware from the govuk-one-login-frontend repository such as the spinner component, language middleware and our base nunjucks template which is extended by all of Core's pages.

Note: the base template in the above repo depends on nunjucks filters that are defined in this repository. When updating a filter, consider if it affects the base nunjucks file and if the change will require multiple deployments to ensure backwards compatibility.

Environment variables

This project uses the following environment variables:

Variable name	Description	Default value
API_BASE_URL	Specifies the base host of the backend API. It is used by the application to make requests to the backend services.	-
CONTACT_URL	URL of the GOV.UK One Login contact form.	https://home.account.gov.uk/contact-gov-uk-one-login
ENABLE_PREVIEW	Turns on the dev/all-templates route to preview individual pages.	development
EXTERNAL_WEBSITE_HOST	Sets the default host used by the application.	`http://localhost:
NODE_ENV	Specifies the environment where the application will run, for example local.	-
PORT	Default port to run the web server on.	4501
SESSION_SECRET	The secret key used for encrypting and decrypting session data.	-
LANGUAGE_TOGGLE	Active Language Toggle into all pages	false
USE_DEVICE_INTELLIGENCE	Turn on device fingerprinting on all pages	false

Running ipv-core-front locally

To run ipv-core-front locally in isolation:

1. Create a .env file based on .env.sample.
2. Run npm run build.
3. In your code editor, use a run configuration that starts src/app.ts. Alternatively, you can run npm run start-dev.
4. To get live style updates, run npm run watch-sass.

Run npm run build again if changes are made to:

• the govuk-frontend library
• translations
• images

Automated tests

Tests can be run with npm run test but note that if you are using Node v22.18+, you will need to run export NODE_OPTIONS="--no-experimental-strip-types" first because of an incompatibility in our dependency 'proxyquire'.

Running ipv-core-front locally with core-back and orch-stub

You can run a complete IPV Core setup by using the local-running setup in core-back.

Analytics

https://www.npmjs.com/package/@govuk-one-login/frontend-analytics

Using pre-commit to verify your commits

We use the pre-commit tool to identify issues before you commit your code. It uses Git hook scripts which you can configure in .pre-commit-config.yaml.

On running git commit, pre-commit Git hooks check for:

• formatting issues in JSON files
• end of file issues
• trailing whitespaces
• AWS credentials or private keys you might have added by accident
• AWS CloudFormation issues
• infrastructure issues - by running checkov
• secrets you might have added by accident - by running detect-secrets.

If any secrets detected are false positives, update the .secrets.baseline file by running detect-secrets scan > .secrets.baseline.

Committing after automatic changes

Pre-commit automatically fixes end of file issues and trailing whitespaces. If this happens, run git commit again to commit the changes.

Understanding issue outputs

If pre-commit detects an issue during a commit, it will produce an output similar to the following:

 git commit -a
check json...........................................(no files to check)Skipped
fix end of files.........................................................Passed
trim trailing whitespace.................................................Passed
detect aws credentials...................................................Passed
detect private key.......................................................Passed
AWS CloudFormation Linter................................................Failed
- hook id: cfn-python-lint
- exit code: 4
W3011 Both UpdateReplacePolicy and DeletionPolicy are needed to protect Resources/PublicHostedZone from deletion
core/deploy/dns-zones/template.yaml:20:3
Checkov..............................................(no files to check)Skipped
- hook id: checkov

Installing the dependencies for pre-commit

To use pre-commit locally you need to install some dependencies, using either:

• Python pip
• Homebrew

Using Python pip

Run the following:

sudo -H pip3 install checkov pre-commit cfn-lint

This should work across all platforms.

Using Homebrew

Run the following:

brew install pre-commit ;\
brew install cfn-lint ;\
brew install checkov

Configuring pre-commit

Once installed, run:

pre-commit install

Update the pre-commit plugins by running:

pre-commit autoupdate && pre-commit install

This command will install and configure the pre-commit Git hooks.

GitHub tools and workflows

GitHub CODEOWNERS

You can use a GitHub CODEOWNERS file to define individuals or teams that are responsible for code in a repository. GitHub automatically requests reviews from these code owners when someone opens a pull request that modifies the code they own.

You can find the CODEOWNERS file for ipv-core-front in the root.