Potential fix for code scanning alert no. 22: DOM text reinterpreted as HTML

[FortiShield]

Potential fix for https://github.com/khulnasoft/ai-toolkit/security/code-scanning/22

To fix the problem, we need to ensure that the file content is properly sanitized before being used in the DOM. One way to achieve this is by validating the file type and content before creating the object URL. Additionally, we can use a library like DOMPurify to sanitize any text content that is derived from the file.

1. Install the DOMPurify library to sanitize text content.
2. Validate the file type and content before creating the object URL.
3. Sanitize any text content derived from the file using DOMPurify.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

Summary by Sourcery

Addresses a potential security vulnerability where DOM text could be reinterpreted as HTML by sanitizing file content before rendering. This prevents potential cross-site scripting (XSS) attacks.

Bug Fixes:

• Sanitizes text content derived from files using DOMPurify to prevent XSS vulnerabilities.
• Validates file types before creating object URLs to ensure only safe files are processed.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses a code scanning alert related to potential DOM text reinterpretation as HTML. It introduces DOMPurify to sanitize text content derived from files and adds file type validation before creating object URLs.

Sequence diagram for displaying text attachments

sequenceDiagram
    participant Browser
    participant Page
    participant getTextFromDataUrl
    participant DOMPurify

    Browser->>Page: Renders page with attachment
    Page->>getTextFromDataUrl: Fetches text from data URL
    getTextFromDataUrl-->>Page: Returns text content
    Page->>DOMPurify: Sanitizes text content
    DOMPurify-->>Page: Returns sanitized text
    Page->>Browser: Displays sanitized text

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File-Level Changes

Change	Details	Files
Introduced DOMPurify to sanitize text content from data URLs.	Installed the DOMPurify library. Imported DOMPurify in page.tsx. Sanitized the text content obtained from getTextFromDataUrl using DOMPurify.sanitize.	examples/next-fastapi/app/(examples)/03-chat-attachments/page.tsx examples/next-fastapi/package.json
Added file type validation before creating object URLs.	Added validateFileType function. Conditionally set the src attribute of the img tag based on the result of validateFileType(attachment).	examples/next-fastapi/app/(examples)/03-chat-attachments/page.tsx

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CI Feedback 🧐

(Feedback updated until commit b2b1f5a)

A test triggered by this PR failed. Here is an AI-generated analysis of the failure:

Action: TypeScript

Failed stage: Install dependencies [❌]

Failure summary: The action failed because the pnpm-lock.yaml file is out of date compared to the package.json file in the examples/next-fastapi directory. Specifically: The error "ERR_PNPM_OUTDATED_LOCKFILE" indicates that the CI is running with the default "frozen-lockfile" setting, which prevents installation when the lock file doesn't match package.json The package dompurify with version ^3.2.4 is present in package.json but missing from the lock file The package tailwindcss has different versions: ^3.4.15 in package.json but ^3.4.15 in the lock file

Relevant error logs: 1: ##[group]Operating System 2: Ubuntu ... 571: env: 572: PNPM_HOME: /home/runner/setup-pnpm/node_modules/.bin 573: ##[endgroup] 574: Scope: all 54 workspace projects 575: ERR_PNPM_OUTDATED_LOCKFILE  Cannot install with "frozen-lockfile" because pnpm-lock.yaml is not up to date with <ROOT>/examples/next-fastapi/package.json 576: Note that in CI environments this setting is true by default. If you still need to run install in such cases, use "pnpm install --no-frozen-lockfile" 577: Failure reason: 578: specifiers in the lockfile ({"@ai-toolkit/react":"1.1.21","@ai-toolkit/ui-utils":"1.1.17","ai-toolkit":"1.1.1","geist":"^1.3.1","next":"latest","react":"^18","react-dom":"^18","@types/node":"^17.0.12","@types/react":"^18","@types/react-dom":"^18","autoprefixer":"^10.4.14","concurrently":"^9.1.0","eslint":"8.57.1","eslint-config-next":"14.2.3","postcss":"^8.4.49","tailwindcss":"^3.4.15","typescript":"5.6.3"}) don't match specs in package.json ({"concurrently":"^9.1.0","@types/node":"^17.0.12","@types/react":"^18","@types/react-dom":"^18","autoprefixer":"^10.4.14","eslint":"8.57.1","eslint-config-next":"14.2.3","postcss":"^8.4.49","tailwindcss":"^3.4.15","typescript":"5.6.3","@ai-toolkit/ui-utils":"1.1.17","@ai-toolkit/react":"1.1.21","ai-toolkit":"1.1.1","geist":"^1.3.1","next":"latest","react":"^18","react-dom":"^18","dompurify":"^3.2.4"}) 579: ##[error]Process completed with exit code 1.