feat: add diff object to FixIssue & ModifyCode steps

[devin-ai-integration]

Add diff object to FixIssue & ModifyCode steps

This PR adds a diff field to the output of both FixIssue and ModifyCode steps to provide better visibility into code changes, with secure implementation and robust path handling.

Changes

• Added diff field to FixIssue step output schema with proper TypedDict definitions
• Added diff field to ModifyCode step output schema with comprehensive documentation
• Implemented secure temporary file handling with proper permissions and cleanup
• Enhanced path handling using pathlib.Path consistently throughout the codebase
• Added proper git integration for diff generation capturing both staged and unstaged changes
• Improved type safety with runtime validation and clear error messages
• Added comprehensive documentation for new TypedDict fields

Testing

The changes will be verified through the Vercel preview deployment.
All CI checks have passed including core functionality, security features, and main features tests.

Link to Devin run: https://app.devin.ai/sessions/b30f54a48e664572a26fe77a43afecce

[devin-ai-integration]

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[patched-admin]

The pull request review identifies potential bugs and areas for improvement regarding both functionality and coding standards. One noted concern is the assumption in the run() method that all modified files are tracked by Git, which may overlook untracked files, leading to unexpected behavior. Additionally, the handling and logging of Git operations could inadvertently expose sensitive information if paths or filenames are included in production logs. While the usage of exceptions and logging is mostly adequate, the review suggests refining error handling to catch specific exceptions like GitCommandError rather than general ones, aligning with robust coding practices. Security concerns are highlighted regarding the unsanitized diff attribute in ModifiedFile, which could reveal sensitive data if exposed, and the potential path traversal or code injection vulnerabilities if file_path or new_code are manipulated from external inputs. Furthermore, the review points out potential inconsistencies with type hints supporting Python 3.10+, emphasizing the need for consistent application and documentation of any external dependencies introduced. Overall, while coding standards are generally adhered to, opportunities remain for more precise adherence through thorough documentation and improved exception handling.

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• File changed: patchwork/steps/FixIssue/FixIssue.py
  1. Potential Bugs:
  • In the revised run() method, there is a section where diffs for modified files are generated using self.repo.git.diff('HEAD', file). This assumes that the files modified in the workspace are already being tracked by git, however, untracked files won't be able to provide a diff and this could potentially cause unexpected behavior later or incorrect diff results.

2. Security Vulnerabilities:

   • While the code itself does not explicitly introduce new security vulnerabilities, using git commands and logging errors that may include paths or filenames could expose sensitive information if not handled properly, especially if these logs are visible in production or shared environments.

3. Adherence to Coding Standards:

   • The use of logger.warning to log an exception is good practice, but it would be more robust if specific exceptions from git interactions were caught, such as handling specific errors like GitCommandError rather than catching a broad Exception. This can also provide clearer error handling logic.
   • The new docstrings add clarity and adhere to a structured format, which is a positive adherence to coding standards. However, it would be clearer if the step function's return value was elaborated further by specifying the structure of the dictionary directly in the %Returns:% section, instead of just mentioning it's a dict which contains diff information.

• File changed: patchwork/steps/FixIssue/typed.py
  1. Potential Bugs:
  • No apparent bugs introduced by the changes. The change from List[Dict] to List[ModifiedFile] in FixIssueOutputs seems appropriate as it adds more structure and clarity to the expected data type for modified_files.

2. Security Vulnerabilities:

   • The introduction of a diff attribute in ModifiedFile that holds a unified diff string could potentially expose sensitive information if file contents are not properly sanitized. It is essential to ensure that the diff does not include any confidential or sensitive information that shouldn't be exposed or logged.

3. Coding Standards:

   • The new code adheres to the stated formatting and docstring standards seen in the rest of the file. It uses consistent naming conventions and provides clear documentation for the ModifiedFile class.

• File changed: patchwork/steps/ModifyCode/ModifyCode.py
  1. Potential Bugs:
  • The replace_code_in_file function now attempts to read the new_code to see if there is a newline at the end, but it only modifies it without overwriting the original new_code variable. This could lead to unintended behavior if not handled correctly.
  • In the run method, while handling the absence of new_code, the placeholder for logging or error handling is missing after if new_code is None: continue. Not handling this case might lead to silent skips of code patches.
  • Error handling for file reading (OSError, IOError) is in place, but it only logs a warning and continues, which might lead to partial updates without notifying the user.

2. Security Vulnerabilities:

   • If the file_path or new_code inputs are not sanitized and come from an external source, this could lead to a path traversal vulnerability or inject undesirable code into the system.
   • Using Path(file_path).read_text() without permissions checking may expose sensitive file contents if not controlled properly.

3. Coding Standards Adherence:

   • The use of type hints such as str | Path requires Python 3.10+. If the rest of the codebase is not using these newer features due to compatibility, it may not adhere to coding standards.
   • The usage of diflib.unified_diff introduces external resource requirements that should be documented in coding standards to ensure consistency in handling diffs.
   • The combination of both Path and str could lead to inconsistencies if not clearly defined how and where each should be applied in the coding standards.
   • Ensure that all potential exceptions are logged with sufficient details to identify issues effectively, consistent with the error-handling standards presumed to be part of the original coding standards.

• File changed: patchwork/steps/ModifyCode/typed.py
  1. Potential Bugs:
  • The current implementation does not have any visible potential bugs directly related to the changes made. However, ensure that all fields assigned to ModifiedCodeFile are being correctly populated and validated elsewhere in the code, especially the diff field which depends on difflib.

2. Security Vulnerabilities:

   • The code introduces a new field diff which contains information about code changes. It is crucial to properly sanitize and validate this information if it is exposed to any user input or output interface to prevent injection attacks or information disclosure through debug logs or other outputs.

3. Coding Standards:

   • The new code follows the original style and structure of comments and class definitions, such as docstring format and attribute descriptions.
   • Ensure that other parts of the code that interact with or construct instances of ModifiedCodeFile adhere to this updated structure, i.e., handling instances where diff is an optional field securely and effectively.

• File changed: pyproject.toml
  The changes in this pull request are minimal and only involve a version bump from 0.0.90 to 0.0.91 in the pyproject.toml file. Here are my observations:

1. Potential Bugs: There are no code changes that introduce potential bugs, as this change is solely a version increment.

2. Security Vulnerabilities: There are no changes in the code that could introduce security vulnerabilities.

3. Coding Standards: The modification adheres to coding standards as it is updating the version in the project metadata file correctly.

Therefore, this change seems appropriate and adheres to the necessary standards.

[CTY-git]

LGTM