Gitlab docs improved; gitlab webhook secret config standardization

[s1moe2]

User description

• improved GitlLab setup docs:

  • access token role
  • secrets and vars configuration
  • docker build arguments (used to reference github app instructions, which have a different target)

• introduced webhook_secret in the gitlab config section, to make it consistent with the other webhook secret configs from other sections

  • shared_secret is kept for backwards compatibility

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PR Type

Documentation, Enhancement

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Description

• Improved GitLab setup documentation with detailed steps for creating access tokens, setting up webhooks, and building Docker images.
• Introduced webhook_secret in the GitLab configuration to standardize with other webhook configurations, while maintaining backward compatibility with shared_secret.
• Updated the secrets template to include webhook_secret and clarified its usage.

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Changes walkthrough 📝

	Relevant files
Enhancement	gitlab_webhook.py Add support for GitLab `webhook_secret` configuration        pr_agent/servers/gitlab_webhook.py Added support for webhook_secret in GitLab webhook configuration. Maintained backward compatibility with shared_secret. +2/-2
Documentation	gitlab.md Improve GitLab setup documentation and instructions            docs/docs/installation/gitlab.md Updated GitLab setup instructions for access token and webhook. Added detailed steps for Docker image building and deployment. Standardized secret configuration instructions. +24/-9
Configuration changes	.secrets_template.toml Update secrets template for GitLab webhook configuration  pr_agent/settings/.secrets_template.toml Added webhook_secret to GitLab section. Clarified shared_secret as backward compatible. +2/-0

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🏅 Score: 95

🧪 No relevant tests

🔒 No security concerns identified

🔀 Multiple PR themes Sub-PR theme: Implement webhook_secret for GitLab configuration Relevant files: pr_agent/servers/gitlab_webhook.py pr_agent/settings/.secrets_template.toml Sub-PR theme: Update GitLab setup documentation Relevant files: docs/docs/installation/gitlab.md

⚡ Recommended focus areas for review Backward Compatibility Ensure that the new webhook_secret configuration doesn't break existing setups using shared_secret. Documentation Clarity Verify that the new instructions for setting up GitLab webhook are clear and complete, especially regarding the access token role and scope.

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Security	Use constant-time comparison for secret token validation to enhance security against timing attacks Consider using a constant-time comparison function like secrets.compare_digest() instead of the == operator when comparing secret tokens. This helps prevent timing attacks that could potentially compromise the security of the webhook. pr_agent/servers/gitlab_webhook.py [164] -if not request.headers.get("X-Gitlab-Token") == secret: +import secrets +if not secrets.compare_digest(request.headers.get("X-Gitlab-Token", ""), secret): Apply this suggestion Suggestion importance[1-10]: 9 Why: This suggestion addresses a significant security concern by recommending the use of a constant-time comparison function to prevent timing attacks. It is highly relevant and improves the security of the webhook validation process.	9
Enhancement	Simplify settings retrieval by combining multiple get() calls into a single line Consider using the or operator directly in the get() method call to simplify the code and improve readability. This approach reduces the number of get() calls and makes the intention clearer. pr_agent/servers/gitlab_webhook.py [163] -secret = get_settings().get("GITLAB.SHARED_SECRET") or get_settings().get("GITLAB.WEBHOOK_SECRET") +secret = get_settings().get("GITLAB.SHARED_SECRET") or get_settings().get("GITLAB.WEBHOOK_SECRET", "") Apply this suggestion Suggestion importance[1-10]: 3 Why: The suggestion offers a minor improvement in code readability by consolidating the retrieval of settings into a single line. While it simplifies the code slightly, the impact on functionality is minimal.	3

• Author self-review: I have reviewed the PR code suggestions, and addressed the relevant ones.

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[mrT23]

@s1moe2 Thanks for the PR.
i gave some notes on typos, but the main feedback is regarding the duplication of a config.
This should be removed.

It is a shared_secret, and the name is used also in other places. don't change it

[mrT23]

p.s.
a tip to find typos:

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