All files / src/llm-orchestration/action-handlers delete-file.handler.ts

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import {
  BadRequestException,
  Injectable,
  InternalServerErrorException,
  Logger,
} from '@nestjs/common';
import * as fs from 'fs/promises';
import * as path from 'path';
import { plainToClass } from 'class-transformer';
import { validate } from 'class-validator';
import { ActionHandler } from './action-handler.interface';
import {
  ActionExecutionResult,
  PlanExecutionContext,
  ToolMetadata,
} from '../llm-orchestration.interfaces';
import { DeleteFileArgsDto } from './dto/delete-file.args.dto';
import { generateToolCall, generateToolCallJson } from '../../utils';
 
@Injectable()
export class DeleteFileHandler implements ActionHandler {
  readonly toolName = 'delete_file';
  private readonly logger = new Logger(DeleteFileHandler.name);
  private readonly projectRoot: string =
    process.env.REPOBURG_PROJECT_PATH || process.cwd();
 
  getMetadata(): ToolMetadata {
    return {
      name: this.toolName,
      description: this.getDefinition(true),
      arguments: [
        {
          name: 'file_path',
          type: 'string',
          description: 'The relative path of file to delete.',
          required: true,
        },
      ],
    };
  }
 
  /**
   * Generates a tool call example in the specified format.
   * @param toolCall - The tool call object to format
   * @param useJson - If true, uses JSON format; otherwise uses XML-style format
   * @returns Formatted tool call string
   */
  private generateExample(
    toolCall: Record<string, any>,
    useJson: boolean = false,
  ): string {
    return useJson
      ? generateToolCallJson(toolCall)
      : generateToolCall(toolCall);
  }
 
  getDefinition(useJsonFormat: boolean = false): string {
    const example = this.generateExample(
      {
        tool_name: this.toolName,
        file_path: 'src/legacy/old-api-client.js',
      },
      useJsonFormat,
    );
 
    const definition = `
-------------
### ${this.toolName}
  Deletes a file from the filesystem.
 
  #### Parameters
  - "file_path": (string) The relative path of file to delete.
 
  #### Example
    Explanation: Remove the old, unused 'legacy.js' file.
:${example}
-------------
`;
    return `\n${definition.trim()}\n`;
  }
 
  private resolveAndValidatePath(unsafePath: string): string {
    const normalizedPath = path.normalize(unsafePath);
    if (path.isAbsolute(normalizedPath)) {
      throw new BadRequestException(
        `Absolute paths are not allowed: ${unsafePath}`,
      );
    }
    const resolvedPath = path.resolve(this.projectRoot, normalizedPath);
    if (!resolvedPath.startsWith(this.projectRoot)) {
      throw new BadRequestException(
        `Path traversal is not allowed: ${unsafePath}`,
      );
    }
    return resolvedPath;
  }
 
  private async readFileContent(filePath: string): Promise<string | null> {
    try {
      return await fs.readFile(filePath, 'utf8');
    } catch (error) {
      if (error.code === 'ENOENT') {
        return null;
      }
      throw error;
    }
  }
 
  async execute(
    args: { [key: string]: any },
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    _context: PlanExecutionContext,
  ): Promise<ActionExecutionResult> {
    const validatedArgs = plainToClass(DeleteFileArgsDto, args);
    const errors = await validate(validatedArgs);
    if (errors.length > 0) {
      const errorMessages = errors
        .map((err) => Object.values(err.constraints || {}).join(', '))
        .join('; ');
      return {
        status: 'FAILURE',
        summary: `Invalid arguments for ${this.toolName}.`,
        error_message: errorMessages,
        persisted_args: args,
        execution_log: { output: '', error_message: errorMessages },
      };
    }
 
    const { file_path } = validatedArgs;
    const safePath = this.resolveAndValidatePath(file_path);
 
    const originalContent = await this.readFileContent(safePath);
 
    try {
      await fs.unlink(safePath);
      return {
        status: 'SUCCESS',
        summary: `File "${file_path}" deleted.`,
        persisted_args: { file_path },
        original_content_for_revert: originalContent,
        execution_log: {
          output: `${file_path} has been deleted.`,
          error_message: '',
        },
      };
    } catch (error) {
      if (error.code === 'ENOENT') {
        return {
          status: 'SUCCESS',
          summary: `File "${file_path}" did not exist, considered deleted.`,
          persisted_args: { file_path },
          original_content_for_revert: null,
          execution_log: {
            output: `${file_path} did not exist.`,
            error_message: '',
          },
        };
      }
      this.logger.error(
        `Failed to delete file at ${file_path}: ${error.message}`,
      );
      throw new InternalServerErrorException(
        `Failed to delete file "${file_path}": ${error.message}`,
      );
    }
  }
}