Potential fix for code scanning alert no. 1: DOM text reinterpreted as HTML

[gitworkflows]

User description

Potential fix for https://github.com/khulnasoft/ml-recipes/security/code-scanning/1

To fix the problem, we need to ensure that the value taken from serverUser.val() is properly sanitized before being used to construct the URL. This can be done by encoding the value to ensure that any potentially dangerous characters are escaped. We can use a well-known library like encodeURIComponent to encode the user input before using it in the URL.

• In general terms, the problem can be fixed by encoding the user input to prevent XSS attacks.
• Specifically, we will use encodeURIComponent to encode the user and serverName values before constructing the URL.
• The changes will be made in the resources/jupyterhub-mod/template-home.html file, specifically in the JavaScript code block starting at line 44.
• No additional imports or definitions are needed as encodeURIComponent is a built-in JavaScript function.

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

Summary by Sourcery

Bug Fixes:

• Fixes a potential cross-site scripting (XSS) vulnerability by encoding the user and serverName values using encodeURIComponent before constructing the URL, ensuring that any potentially dangerous characters are escaped.

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PR Type

Bug fix

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Description

• Fixes a potential cross-site scripting (XSS) vulnerability.

• Encodes user and serverName values using encodeURIComponent.

• Ensures safe URL construction by escaping dangerous characters.

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Changes walkthrough 📝

	Relevant files
Bug fix	template-home.html Encode user inputs in URL to prevent XSS                                  resources/jupyterhub-mod/template-home.html Replaced direct concatenation of user and serverName with their encoded versions. Used encodeURIComponent to sanitize user inputs in URL construction. +1/-1

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Summary by CodeRabbit

• Bug Fixes
  • Improved server launch by ensuring special characters in names are correctly encoded.
  • Enhanced the server start process by switching from direct link navigation to a clickable trigger for a more reliable experience.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses a potential cross-site scripting (XSS) vulnerability by encoding user input before constructing a URL. The encodeURIComponent function is used to sanitize the user and serverName values, preventing the browser from misinterpreting the input as HTML.

Sequence diagram for URL construction with user input

sequenceDiagram
    participant Browser
    participant JavaScript

    Browser->>JavaScript: User clicks 'Spawn' button
    JavaScript->>JavaScript: Get user and server name
    alt user input is malicious
        JavaScript->>JavaScript: Encode user and server name using encodeURIComponent
    end
    JavaScript->>Browser: Redirect to /spawn/encodedUser/encodedServerName

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File-Level Changes

Change	Details	Files
Implemented input sanitization using encodeURIComponent to prevent XSS vulnerabilities.	Applied encodeURIComponent to the user variable. Applied encodeURIComponent to the serverName variable.	resources/jupyterhub-mod/template-home.html

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[codiumai-pr-agent-free]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[codiumai-pr-agent-free]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Security	Add input validation for security While encodeURIComponent() is good for URL encoding, the user input should also be sanitized before being used to prevent XSS attacks. Add input validation to ensure user and serverName contain only allowed characters. resources/jupyterhub-mod/template-home.html [63] -window.location.href = "../spawn/" + encodeURIComponent(user) + "/" + encodeURIComponent(serverName); +if (/^[\w-]+$/.test(user) && /^[\w-]+$/.test(serverName)) { + window.location.href = "../spawn/" + encodeURIComponent(user) + "/" + encodeURIComponent(serverName); +} else { + console.error("Invalid characters in user or server name"); +} Apply this suggestion Suggestion importance[1-10]: 9 __ Why: The suggestion adds crucial input validation to prevent potential security vulnerabilities by ensuring user and serverName contain only allowed characters before URL encoding, which is an important security measure beyond just URL encoding.	High
More

[coderabbitai]

Walkthrough

The changes update the JavaScript logic in the JupyterHub template to improve URL handling when spawning a new server. The onAddServerClick function now uses encodeURIComponent for both the user and server names, ensuring proper encoding of special characters. Additionally, the action to start a server has been shifted from a direct href link to an onclick event handler that initiates a fetch call and then performs a redirection.

Changes

File	Change Summary
resources/.../template-home.html	Updated onAddServerClick to use encodeURIComponent for safe encoding of user/server names; replaced the href with an onclick handler that triggers a fetch call to start the server and redirect.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Browser
    participant JupyterHub
    User->>Browser: Click "Add Server"
    Browser->>Browser: Execute onAddServerClick
    Browser->>Browser: Encode user & server names
    Browser->>JupyterHub: Send fetch request (using encoded URL)
    JupyterHub-->>Browser: Return server start response
    Browser->>User: Redirect to new server page

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Poem

I'm a rabbit with a joyful beat,
Hopping through code with a rhythm so sweet.
Special characters now safely encoded,
With fetch calls sprouting a path well-loaded.
Here's to fresh hops and code complete!

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 829dc19 and dd79daa.

📒 Files selected for processing (1)

• resources/jupyterhub-mod/template-home.html (1 hunks)

🔇 Additional comments (1)

resources/jupyterhub-mod/template-home.html (1)

63-63: Secure URL Construction with encodeURIComponent

The updated use of encodeURIComponent for both the user and serverName values correctly sanitizes these inputs before they are inserted into the URL. This effectively mitigates the risk of XSS by ensuring that any special characters are properly encoded, preventing them from being interpreted as executable code or malicious HTML.

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