This project, "blurable", provides a JavaScript library for blurring images directly in the web browser.
-
Business Priorities and Goals:
- Enhance user privacy by blurring sensitive parts of images displayed on websites.
- Improve website aesthetics by selectively blurring images for design purposes.
- Provide a client-side solution for image blurring to reduce server-side processing load and improve responsiveness.
- Offer an easy-to-integrate library for web developers to implement image blurring functionality.
-
Business Risks:
- Potential for bypass of blurring functionality, leading to unintended exposure of sensitive information.
- Performance impact on client-side rendering due to blurring calculations, especially on low-powered devices.
- Compatibility issues across different web browsers and devices.
- Dependency on client-side JavaScript, which can be disabled or manipulated by users.
-
Existing Security Controls:
- security control: Client-side execution environment provided by web browsers. (Implemented by: Web Browser Security Model)
- security control: Code hosted on GitHub, potentially benefiting from GitHub's security features. (Implemented by: GitHub Platform Security)
- security control: Open-source nature of the library allows for community review and scrutiny. (Implemented by: Open Source Community)
-
Accepted Risks:
- accepted risk: Client-side JavaScript is inherently less secure than server-side processing as it is executed in an environment controlled by the user.
- accepted risk: Potential vulnerabilities in the library code itself, requiring ongoing maintenance and updates.
- accepted risk: Reliance on the security of web browsers and their JavaScript engines.
-
Recommended Security Controls:
- security control: Implement automated dependency scanning to identify and address known vulnerabilities in library dependencies.
- security control: Conduct regular code reviews, including security-focused reviews, to identify and mitigate potential security flaws in the library code.
- security control: Provide clear documentation and examples on secure usage of the library, highlighting potential security considerations for developers.
- security control: Consider providing server-side blurring as an alternative or complementary solution for scenarios requiring higher security.
-
Security Requirements:
- Authentication: Not directly applicable to the library itself, as it is a client-side component. Authentication would be handled by the web application integrating the library.
- Authorization: Not directly applicable to the library itself. Authorization would be handled by the web application to control which images are blurred and under what conditions.
- Input Validation: The library should handle image data robustly and prevent potential issues from malformed or malicious image inputs. Input validation should be implemented within the library to ensure it can process various image formats and sizes safely.
- Cryptography: Cryptography is not a core requirement for this image blurring library. However, if future enhancements involve features like watermarking or secure image processing, cryptographic considerations might become relevant. For now, standard web security practices (HTTPS) for delivering the library and images are sufficient.
flowchart LR
subgraph Web Application
A("Blurable Library")
end
B("Web Browser")
C("Web Server")
D("Content Delivery Network (CDN)")
B -->|Integrates and Executes| A
B <--|Requests Library and Images| C
B <--|Requests Library and Images| D
Web Application --|> B
C --|> Web Application
D --|> Web Application
style A fill:#f9f,stroke:#333,stroke-width:2px
- Context Diagram Elements:
-
- Name: Blurable Library
- Type: Software System
- Description: A JavaScript library for blurring images in web browsers.
- Responsibilities: Provides functions to blur images client-side.
- Security controls: Input validation within the library to handle image data safely.
-
- Name: Web Browser
- Type: Person / System
- Description: The end-user's web browser (e.g., Chrome, Firefox, Safari).
- Responsibilities: Executes JavaScript code, renders web pages, displays blurred images to the user.
- Security controls: Browser security model, including JavaScript execution sandboxing, Content Security Policy (CSP) enforced by the web application.
-
- Name: Web Server
- Type: Software System
- Description: Server hosting the web application that uses the Blurable Library.
- Responsibilities: Serves the web application code, including HTML, CSS, JavaScript (including Blurable Library), and images.
- Security controls: HTTPS for secure communication, web server security configurations, access controls to web application resources.
-
- Name: Content Delivery Network (CDN)
- Type: Software System
- Description: Optional CDN for hosting and delivering static assets like the Blurable Library and images.
- Responsibilities: Provides fast and efficient delivery of static content to web browsers.
- Security controls: CDN security features, HTTPS delivery, potentially DDoS protection.
-
flowchart LR
subgraph Web Browser
subgraph "Web Application Container"
A("Blurable Library Container")
end
end
A -->|JavaScript API calls| "Web Browser Environment"
style A fill:#f9f,stroke:#333,stroke-width:2px
- Container Diagram Elements:
-
- Name: Blurable Library Container
- Type: Container - JavaScript Library
- Description: Encapsulates the JavaScript code of the Blurable Library. It is a client-side container running within the web browser.
- Responsibilities: Implements image blurring algorithms in JavaScript, provides an API for web applications to use the blurring functionality.
- Security controls: JavaScript code is subject to browser security sandbox. Input validation within the library.
-
- Name: Web Browser Environment
- Type: Container - Execution Environment
- Description: The JavaScript execution environment provided by the web browser.
- Responsibilities: Executes the Blurable Library JavaScript code, provides access to browser APIs (e.g., Canvas API for image manipulation).
- Security controls: Browser security model, JavaScript engine security, Content Security Policy (CSP) enforced by the web application.
-
Deployment Scenario: Delivery via CDN and Web Server
flowchart LR
subgraph "End User Device"
A("Web Browser Instance")
end
subgraph "CDN Infrastructure"
B("CDN Server")
end
subgraph "Web Server Infrastructure"
C("Web Server Instance")
end
A <--|HTTPS - Requests Library| B
A <--|HTTPS - Requests Web Application and Images| C
style A fill:#ccf,stroke:#333,stroke-width:2px
style B fill:#eee,stroke:#333,stroke-width:2px
style C fill:#eee,stroke:#333,stroke-width:2px
- Deployment Diagram Elements:
-
- Name: Web Browser Instance
- Type: Deployment Environment - Client Device
- Description: A user's web browser running on their device (desktop, mobile, etc.).
- Responsibilities: Executes the Blurable Library and web application code, renders the user interface.
- Security controls: Browser security features, operating system security on the end-user device.
-
- Name: CDN Server
- Type: Infrastructure - CDN Node
- Description: A server within the Content Delivery Network responsible for hosting and delivering the Blurable Library and potentially images.
- Responsibilities: Provides fast and geographically distributed delivery of static assets.
- Security controls: CDN security measures, DDoS protection, HTTPS termination, access controls to CDN configuration.
-
- Name: Web Server Instance
- Type: Infrastructure - Web Server
- Description: A server hosting the web application and potentially images.
- Responsibilities: Serves the web application code, HTML, CSS, JavaScript, and images.
- Security controls: Web server security hardening, HTTPS configuration, firewall, intrusion detection/prevention systems.
-
flowchart LR
A("Developer") -->|Code Changes, Commits| B("GitHub Repository")
B -->|Webhook, Scheduled Trigger| C("CI/CD Pipeline (e.g., GitHub Actions)")
C -->|Build, Test, Lint, Security Scan| D("Build Artifacts (JavaScript files)")
D -->|Publish to npm (optional), CDN, Web Server| E("Distribution")
style A fill:#ccf,stroke:#333,stroke-width:2px
style B fill:#eee,stroke:#333,stroke-width:2px
style C fill:#eee,stroke:#333,stroke-width:2px
style D fill:#eee,stroke:#333,stroke-width:2px
style E fill:#eee,stroke:#333,stroke-width:2px
- Build Process Elements:
-
- Name: Developer
- Type: Person
- Description: Software developer working on the Blurable Library.
- Responsibilities: Writes code, commits changes, performs local testing.
- Security controls: Developer workstation security, code review practices.
-
- Name: GitHub Repository
- Type: Code Repository
- Description: Central repository hosting the source code of the Blurable Library.
- Responsibilities: Version control, code storage, collaboration platform.
- Security controls: Access controls, branch protection, audit logs, GitHub security features.
-
- Name: CI/CD Pipeline (e.g., GitHub Actions)
- Type: Automation System
- Description: Automated pipeline for building, testing, and deploying the Blurable Library.
- Responsibilities: Automates build process, runs tests, performs static analysis, potentially publishes artifacts.
- Security controls: Secure pipeline configuration, access controls to pipeline definitions, secrets management for credentials, security scanning tools integration (SAST, dependency scanning).
-
- Name: Build Artifacts (JavaScript files)
- Type: Software Artifact
- Description: Compiled and packaged JavaScript files of the Blurable Library.
- Responsibilities: Represent the distributable version of the library.
- Security controls: Code signing (optional), integrity checks (e.g., checksums).
-
- Name: Distribution
- Type: Distribution Channel
- Description: Mechanisms for distributing the Blurable Library (e.g., npm, CDN, direct download from web server).
- Responsibilities: Makes the library available to web developers for integration into their applications.
- Security controls: Secure distribution channels (HTTPS), integrity checks for downloaded files, access controls to publishing platforms.
-
-
Critical Business Processes:
- Displaying images on websites while maintaining user privacy or aesthetic design.
- Ensuring website performance and responsiveness when blurring images.
- Maintaining compatibility and functionality across different browsers and devices.
-
Data to Protect and Sensitivity:
- Images themselves are the primary data.
- Sensitivity depends on the context of use. Images might contain:
- Personally Identifiable Information (PII) like faces, tattoos, or identifiable objects.
- Sensitive content that users might want to blur for privacy or content moderation reasons.
- Proprietary or confidential visual information.
- Sensitivity level can range from low (aesthetic blurring) to high (privacy protection of sensitive data).
-
BUSINESS POSTURE:
- Question: What is the primary use case for the Blurable Library? Is it primarily for privacy, aesthetics, or content moderation?
- Assumption: The library is intended for general-purpose image blurring in web applications, with a focus on ease of use and client-side performance.
-
SECURITY POSTURE:
- Question: Are there specific security policies or compliance requirements that the Blurable Library needs to adhere to?
- Assumption: Standard web security best practices are sufficient for the initial version of the library. More stringent security measures might be needed depending on specific use cases and sensitivity of data being blurred.
- Question: What is the acceptable level of risk regarding potential bypass of the blurring functionality?
- Assumption: While complete prevention of bypass is not guaranteed in a client-side library, reasonable efforts should be made to make it non-trivial and to document the limitations.
-
DESIGN:
- Question: Are there specific performance requirements for the blurring functionality?
- Assumption: Performance is a key consideration, and the library is designed to be reasonably efficient for client-side execution.
- Question: How will the library be integrated into web applications? Are there specific frameworks or environments it needs to support?
- Assumption: The library is designed to be easily integrated into various web applications using standard JavaScript practices.