Contribute to development
If you would like to contribute to OWASP Juice Shop but need some idea what task to address, the best place to look is in the GitHub issue lists at https://github.com/bkimminich/juice-shop/issues.
- Issues labelled with help wanted indicate tasks where the project team would very much appreciate help from the community
- Issues labelled with good first issue indicate tasks that are isolated and not too hard to implement, so they are well-suited for new contributors
The following sections describe in detail the most important rules and processes when contributing to the OWASP Juice Shop project.
Tips for newcomers
If you are new to application development - particularly with Angular and Express.js - it is recommended to read the Codebase 101 to get an overview what belongs where. It will lower the entry barrier for you significantly.
The project uses
git as its version control system and GitHub as the
central server and collaboration platform. OWASP Juice Shop resides in
the following repository:
OWASP Juice Shop is maintained in a simplified
fashion, where all active development happens on the
master is used to deploy stable versions to the
Heroku demo instance and later
create tagged releases from.
Feature branches are only used for long-term tasks that could jeopardize
regular releases from
develop in the meantime. Likewise prototypes and
experiments must be developed on an individual branch or a distinct fork
of the entire project.
Any release from
master is tagged with a unique version in the format
vMAJOR.MINOR.PATCH, for example
Given a version number
MAJOR.MINOR.PATCH, increment the:
MAJORversion when you make incompatible API changes,
MINORversion when you add functionality in a backwards-compatible manner, and
PATCHversion when you make backwards-compatible bug fixes.1
The current version of the project (omitting the leading
v) must be
manually maintained in the following three places:
All other occurrences of the version (i.e. packaged releases & the menu
bar of the application itself) are resolved through the
Using Git-Flow means that PRs have the highest chance of getting
accepted and merged when you open them on the
develop branch of your
fork. That allows for some post-merge changes by the team without
directly compromising the
master branch, which is supposed to hold
always be in a release-ready state.
It is usually not a big deal if you accidentally open a PR for the
master branch. GitHub added the possibility to change the target
branch for a PR afterwards some time ago.
The minimum requirements for code contributions are:
- The code must be compliant with the JS Standard Code Style rules or their correspondingly configured TSLint and Sass Lint rules.
- All new and changed code should have a corresponding unit and/or integration test.
- New and changed challenges must have a corresponding e2e test.
- Linting, as well as all unit, integration and e2e tests should pass locally before opening a Pull Request.
- All Git commits within a PR must be signed off to indicate the contributor's agreement with the Developer Certificate of Origin.
npm run lint
npm run lint script verifies code compliance with
tslintrules for the frontend TypeScript code (which are defined to be equal to
standardby deriving from
sass-lintrules (for all frontend SCSS code)
If PRs deviate from this coding style, they will the build and will not be merged until made compliant.
In case your PR is failing from style guide issues try running
lint:fix over your code - this will fix all syntax or code style issues
automatically without breaking your code.
npm test # run all unit tests npm run frisby # run all API integration tests npm run protractor # run all end-to-end tests
Pull Requests are verified to pass all of the following test stages during the continuous integration build. It is recommended that you run these tests on your local computer to verify they pass before submitting a PR. New features should be accompanied by an appropriate number of corresponding tests to verify they behave as intended.
There is a full suite containing isolated unit tests
- for all client-side code in
- for the server-side routes and libraries in
The integration tests in
test/api/*Spec.js verify if the backend for
all normal use cases of the application works. All server-side
vulnerabilities are also tested.
npm run frisby
These tests automatically start a server and run the tests against it. A working internet connection is recommended.
The e2e test suite in
test/e2e/*Spec.js verifies if all client- and
server-side vulnerabilities are exploitable. It passes only when all
challenges are solvable on the score board.
npm run protractor
The end-to-end tests require a locally installed Google Chrome browser and internet access to be able to pass.
If you have a web proxy configured via
variable, the end-to-end tests will honor this setting. This can be
useful to e.g. run the tests through tools like
Testing packaged distributions
During releases the application will be packaged into
archives for another easy setup method. When you contribute a change
that impacts what the application needs to include, make sure you test
this manually on your system.
npm install --production && grunt package
Then take the created archive from
/dist and follow the steps
described above in
to make sure nothing is broken or missing.
Developer Certificate of Origin
The Developer Certificate of Origin (DCO) is a lightweight way for contributors to certify that they wrote or otherwise have the right to submit the code they are contributing to the project. Here is the full text of the DCO, reformatted for readability:
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or
(b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or
(c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it.
(d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.
Contributors sign-off that they adhere to these requirements by adding a Signed-off-by line to commit messages.
This is my commit message Signed-off-by: Random J Developer <firstname.lastname@example.org>
Git even has a
-scommand line option to append this automatically to your commit message:
$ git commit -s -m 'This is my commit message'
Continuous integration & deployment
The main build and CI server for OWASP Juice Shop is set up on Travis-CI:
On every push to GitHub, a build is triggered on Travis-CI. A build
consists of several stages in which one or more jobs are executed. Not
only direct pushes to the
develop branches are built, but
Pull Requests from other branches or forks as well. This helps the
project team to assess if a PR can be safely merged into the codebase.
For tag-builds (i.e. versions to be released) the some additional steps
are necessary to package the
release-artifacts for Linux, MacOS and Windows for each supported Node.js version
and attach these to the release page on GitHub. Lastly, not all stages
are executed for all supported Node.js versions in order to shorten the
feedback loop. The higher-level integration and e2e tests are only run
for the officially preferred Node.js version
|Linting on Node.js 12.x||Unit tests on Node.js 10.x, 12.x and 13.x||Integration tests and re-run Unit tests on Node.js 12.x and publish combined coverage data to Code Climate||End-to-end tests on Node.js 12.x||Deploy Node.js 12.x to Heroku|
||✔️||✔️||✔️||✔️||✔️ to http://juice-shop-staging.herokuapp.com|
||✔️||✔️||✔️||✔️||✔️ to http://juice-shop.herokuapp.com|
|Version tag||❌||❌ instead compile and release pre-packaged distributions for Linux with Node.js 10.x, 12.x and 13.x to GitHub||❌||❌||❌|
ℹ️ The stages in the table above are executed sequentially from left
to right. A failing job in any stage will break the build and all
following stages will not be executed allowing a faster feedback loop.
The table only depicts the setup for Linux, as this is where all tests
are executed. In the MacOS and Windows jobs only
npm install is
executed and release-artifacts are assembled in tag-builds.