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BUSINESS POSTURE

PixiJS is a popular open-source 2D graphics library. Its primary goal is to provide a fast and flexible rendering engine for web browsers, enabling developers to create rich, interactive graphics, visualizations, and games without having to deal with the complexities of WebGL directly.

Business priorities:

  • Maintain high performance and efficiency: PixiJS's core value proposition is speed. Any design changes must prioritize performance.
  • Broad browser compatibility: Support a wide range of browsers and devices, including older ones, to maximize reach.
  • Ease of use and developer experience: Provide a clean, well-documented API that is easy to learn and use.
  • Extensibility and modularity: Allow developers to extend and customize the library to meet their specific needs.
  • Community engagement and support: Foster a vibrant community and provide adequate support to users.
  • Open Source Sustainability: Ensure the long-term viability of the project through contributions, sponsorships, and a healthy community.

Business risks:

  • Performance regressions: Changes to the codebase could inadvertently introduce performance bottlenecks, impacting existing users.
  • Compatibility issues: New features or changes might break compatibility with certain browsers or devices.
  • API instability: Frequent or breaking changes to the API could frustrate developers and hinder adoption.
  • Security vulnerabilities: As a library that executes code in the browser, security vulnerabilities could expose users to attacks.
  • Lack of maintainers or contributors: The project's long-term health depends on a consistent stream of contributions and active maintenance.
  • Competition: Other libraries or frameworks could emerge and challenge PixiJS's dominance.

SECURITY POSTURE

Existing security controls:

  • security control: Input validation: PixiJS partially validates user-provided data, such as texture sources and dimensions, to prevent common errors. Implemented in various modules, such as Texture and Sprite.
  • security control: Code style and reviews: The project uses ESLint and has a code review process to maintain code quality and identify potential issues. Described in contributing guidelines.
  • security control: Dependency management: The project uses package managers (like npm) to manage dependencies and keep them updated. Described in package.json.
  • security control: Regular updates: The project is actively maintained, and updates are released regularly to address bugs and security vulnerabilities.

Accepted risks:

  • accepted risk: Cross-Site Scripting (XSS): While PixiJS itself doesn't directly handle user input in a way that would typically lead to XSS, it's possible for developers to misuse the library and create XSS vulnerabilities in their applications. This is a common risk with any JavaScript library.
  • accepted risk: Denial of Service (DoS): Maliciously crafted content or excessive resource usage could potentially lead to performance degradation or crashes in the browser.
  • accepted risk: Third-party dependencies: Vulnerabilities in third-party dependencies could potentially impact PixiJS.

Recommended security controls:

  • security control: Content Security Policy (CSP) integration guidelines: Provide clear guidelines for developers on how to integrate PixiJS with a strong CSP to mitigate XSS risks.
  • security control: WebGL context loss handling: Implement robust handling of WebGL context loss events to prevent crashes and improve stability.
  • security control: Input sanitization recommendations: Offer specific recommendations for sanitizing user-provided data that is used to create PixiJS objects.
  • security control: Security audits: Conduct periodic security audits of the codebase to identify potential vulnerabilities.
  • security control: Supply Chain Security: Implement SLSA framework to ensure integrity of build and deployment process.

Security requirements:

  • Authentication: Not directly applicable to PixiJS, as it's a client-side rendering library. Authentication is the responsibility of the application using PixiJS.
  • Authorization: Not directly applicable. Authorization is the responsibility of the application using PixiJS.
  • Input validation: All user-provided data, such as texture sources, dimensions, and shader parameters, should be validated to prevent errors and potential security vulnerabilities.
  • Cryptography: Not directly applicable, unless PixiJS is used to handle encrypted assets, in which case standard web cryptography practices should be followed.

DESIGN

C4 CONTEXT

graph LR
    User["User/Browser"] -- "Interacts with" --> PixiJSApp["PixiJS Application"]
    PixiJSApp -- "Uses" --> PixiJS["PixiJS Library"]
    PixiJSApp -- "Fetches assets from" --> WebServer["Web Server"]
    PixiJS -- "Uses" --> WebGLAPI["WebGL API"]
    PixiJS -- "Uses" --> CanvasAPI["Canvas API"]
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Elements description:

  • Element:

    • Name: User/Browser
    • Type: User
    • Description: The end-user interacting with the PixiJS application through a web browser.
    • Responsibilities: Viewing and interacting with the visual content rendered by PixiJS.
    • Security controls: Browser's built-in security mechanisms (Same-Origin Policy, CSP, etc.).

  • Element:

    • Name: PixiJS Application
    • Type: Application
    • Description: The web application built using the PixiJS library.
    • Responsibilities: Creating and managing PixiJS objects, handling user input, and orchestrating the rendering process.
    • Security controls: Application-specific security measures, input validation, and proper use of PixiJS API.

  • Element:

    • Name: PixiJS Library
    • Type: Library
    • Description: The PixiJS rendering library.
    • Responsibilities: Providing a high-level API for creating and manipulating 2D graphics, managing rendering resources, and interacting with WebGL/Canvas.
    • Security controls: Input validation, code reviews, dependency management.

  • Element:

    • Name: Web Server
    • Type: System
    • Description: The server hosting the PixiJS application and its assets (images, sounds, etc.).
    • Responsibilities: Serving the application files and assets to the user's browser.
    • Security controls: Standard web server security measures (HTTPS, access controls, etc.).

  • Element:

    • Name: WebGL API
    • Type: API
    • Description: The browser's WebGL API, used by PixiJS for hardware-accelerated rendering.
    • Responsibilities: Providing low-level access to the GPU for rendering graphics.
    • Security controls: Browser's implementation of WebGL security.

  • Element:

    • Name: Canvas API
    • Type: API
    • Description: The browser's Canvas API, used by PixiJS as a fallback rendering context.
    • Responsibilities: Providing a 2D drawing API.
    • Security controls: Browser's implementation of Canvas security.

C4 CONTAINER

graph LR
    User["User/Browser"] -- "Interacts with" --> App["Application"]
    App -- "Uses" --> Renderer["Renderer"]
    App -- "Uses" --> SceneGraph["Scene Graph"]
    App -- "Uses" --> AssetLoader["Asset Loader"]
    Renderer -- "Uses" --> WebGL["WebGL API"]
    Renderer -- "Uses" --> Canvas["Canvas API"]
    AssetLoader -- "Fetches from" --> WebServer["Web Server"]
    SceneGraph -- "Manages" --> DisplayObjects["Display Objects"]
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Elements description:

  • Element:

    • Name: User/Browser
    • Type: User
    • Description: The end-user interacting with the PixiJS application.
    • Responsibilities: Viewing and interacting with the application.
    • Security controls: Browser's built-in security.

  • Element:

    • Name: Application
    • Type: Container
    • Description: The user's application code that utilizes PixiJS.
    • Responsibilities: Setting up the PixiJS stage, creating and managing display objects, handling user interactions.
    • Security controls: Application-level security, input validation.

  • Element:

    • Name: Renderer
    • Type: Container
    • Description: The core rendering engine of PixiJS.
    • Responsibilities: Choosing between WebGL and Canvas rendering, managing rendering contexts, drawing display objects.
    • Security controls: Input validation, WebGL context loss handling.

  • Element:

    • Name: Scene Graph
    • Type: Container
    • Description: The hierarchical structure of display objects.
    • Responsibilities: Organizing and managing display objects, handling transformations and visibility.
    • Security controls: None specific.

  • Element:

    • Name: Asset Loader
    • Type: Container
    • Description: The component responsible for loading assets (images, textures, etc.).
    • Responsibilities: Fetching assets from the web server, caching loaded assets.
    • Security controls: Input validation (asset URLs).

  • Element:

    • Name: WebGL API
    • Type: API
    • Description: The browser's WebGL API.
    • Responsibilities: Providing low-level access to the GPU.
    • Security controls: Browser's WebGL implementation.

  • Element:

    • Name: Canvas API
    • Type: API
    • Description: The browser's Canvas API.
    • Responsibilities: Providing a 2D drawing API.
    • Security controls: Browser's Canvas implementation.

  • Element:

    • Name: Web Server
    • Type: System
    • Description: The server hosting the application and assets.
    • Responsibilities: Serving files to the browser.
    • Security controls: Standard web server security.

  • Element:

    • Name: Display Objects
    • Type: Component
    • Description: The individual elements that make up the scene (sprites, text, graphics, etc.).
    • Responsibilities: Representing visual elements in the scene.
    • Security controls: None specific.

DEPLOYMENT

PixiJS, being a JavaScript library, is typically deployed as part of a web application. There are several deployment options:

  1. Traditional Web Server: Deploying the HTML, CSS, JavaScript (including PixiJS), and asset files to a web server like Apache, Nginx, or IIS.
  2. Cloud Storage and CDN: Using services like AWS S3, Google Cloud Storage, or Azure Blob Storage to host the static files and a CDN (Content Delivery Network) like Cloudflare, Akamai, or AWS CloudFront to distribute the content globally.
  3. Serverless Platforms: Deploying the application using serverless functions (e.g., AWS Lambda, Google Cloud Functions) and a static site hosting service (e.g., Netlify, Vercel).
  4. Bundled with Application: In case PixiJS is used to build desktop application, using Electron or similar framework, PixiJS will be bundled with application.

We'll describe the Cloud Storage and CDN approach in detail, as it's a common and efficient deployment method for web applications.

graph LR
    User["User/Browser"] -- "Requests" --> CDN["CDN (e.g., Cloudflare)"]
    CDN -- "Requests (Cache Miss)" --> CloudStorage["Cloud Storage (e.g., AWS S3)"]
    CloudStorage -- "Serves Files" --> CDN
    CDN -- "Serves Files" --> User
    Developer["Developer"] -- "Uploads Files" --> CloudStorage
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Elements description:

  • Element:

    • Name: User/Browser
    • Type: User
    • Description: The end-user accessing the application through a web browser.
    • Responsibilities: Making requests for the application files and assets.
    • Security controls: Browser's built-in security mechanisms.

  • Element:

    • Name: CDN (e.g., Cloudflare)
    • Type: System
    • Description: A Content Delivery Network that caches and serves the application files from edge locations closer to the users.
    • Responsibilities: Caching static content, reducing latency, and improving performance.
    • Security controls: DDoS protection, HTTPS, WAF (Web Application Firewall).

  • Element:

    • Name: Cloud Storage (e.g., AWS S3)
    • Type: System
    • Description: A cloud storage service that stores the application's static files (HTML, CSS, JavaScript, assets).
    • Responsibilities: Storing and serving the application files.
    • Security controls: Access control lists (ACLs), bucket policies, encryption at rest, versioning.

  • Element:

    • Name: Developer
    • Type: User
    • Description: The developer deploying the application.
    • Responsibilities: Uploading the application files to the cloud storage service.
    • Security controls: IAM (Identity and Access Management) roles and permissions.

BUILD

PixiJS uses a build process to create optimized, minified versions of the library for distribution. The build process typically involves:

  1. Source Code: Developers write code in modern JavaScript (ES modules).
  2. Transpilation: Babel is used to transpile the code to older JavaScript versions for broader browser compatibility.
  3. Bundling: Rollup is used to bundle the modules into a single file (or multiple files for different formats like UMD, ESM).
  4. Minification: Terser is used to minify the bundled code, reducing file size.
  5. Linting: ESLint is used to enforce code style and identify potential errors.
  6. Testing: Jest is used for unit testing.
  7. Documentation Generation: Typedoc is used to generate API documentation from the source code.
  8. Publishing: The built files and documentation are published to npm and CDN.
graph LR
    Developer["Developer"] -- "Writes Code" --> SourceCode["Source Code (ES Modules)"]
    SourceCode -- "Transpiles" --> Babel["Babel"]
    Babel -- "Bundles" --> Rollup["Rollup"]
    Rollup -- "Minifies" --> Terser["Terser"]
    Terser -- "Outputs" --> BuildArtifacts["Build Artifacts (UMD, ESM)"]
    SourceCode -- "Lints" --> ESLint["ESLint"]
    SourceCode -- "Tests" --> Jest["Jest"]
    SourceCode -- "Generates Docs" --> Typedoc["Typedoc"]
    Typedoc -- "Outputs" --> Documentation["Documentation"]
    BuildArtifacts -- "Published to" --> npm["npm Registry"]
    BuildArtifacts -- "Published to" --> CDN2["CDN"]
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Security controls in the build process:

  • security control: Linting (ESLint): Enforces code style and helps prevent common coding errors that could lead to vulnerabilities.
  • security control: Dependency management (npm): Uses npm to manage dependencies and keep them updated, reducing the risk of using vulnerable libraries. package-lock.json is used to ensure consistent builds.
  • security control: Testing (Jest): Unit tests help ensure code correctness and prevent regressions.
  • security control: Regular updates: The project is actively maintained, and updates are released regularly, including security patches.
  • security control: Code reviews: All code changes are reviewed by other developers before being merged.
  • security control: GitHub Actions: Build process is automated using GitHub Actions, providing transparency and auditability.

RISK ASSESSMENT

Critical business processes to protect:

  • The core rendering engine: Ensuring its performance, stability, and compatibility.
  • The developer experience: Maintaining a clean and easy-to-use API.
  • The community and ecosystem: Fostering a healthy and active community.

Data to protect and their sensitivity:

  • PixiJS itself doesn't directly handle sensitive user data. However, applications built with PixiJS might handle such data. The sensitivity of the data depends on the specific application. Examples include:
    • User input (text, mouse coordinates): Potentially sensitive if used for authentication or personal information.
    • Game state: Could be sensitive in competitive games.
    • Asset data (images, sounds): Might be proprietary or copyrighted.

QUESTIONS & ASSUMPTIONS

Questions:

  • Are there any specific compliance requirements (e.g., GDPR, CCPA) that apply to applications built with PixiJS?
  • Are there any plans to introduce features that might handle sensitive user data directly within PixiJS?
  • What is the process for reporting security vulnerabilities in PixiJS?
  • What is the long-term strategy for maintaining browser compatibility, especially with the evolving web platform?

Assumptions:

  • Business Posture: The primary goal is to provide a fast and reliable 2D rendering library for the web.
  • Security Posture: Developers using PixiJS are responsible for the security of their applications, including input validation and data protection. PixiJS aims to provide a secure foundation, but it cannot guarantee the security of applications built on top of it.
  • Design: The design is modular and extensible, allowing developers to customize and extend the library. The core rendering engine is optimized for performance and compatibility.