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BadRequestException,
Injectable,
InternalServerErrorException,
Logger,
Optional,
} 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 { OverwriteFileArgsDto } from './dto/overwrite-file.args.dto';
import { generateToolCall, generateToolCallJson } from '../../utils';
import { SyntaxValidationService } from '../../syntax-validation/syntax-validation.service';
import { ApplicationStateService } from '../../application-state/application-state.service';
@Injectable()
export class OverwriteFileHandler implements ActionHandler {
readonly toolName = 'overwrite_file';
private readonly logger = new Logger(OverwriteFileHandler.name);
private readonly projectRoot: string =
process.env.REPOBURG_PROJECT_PATH || process.cwd();
constructor(
@Optional()
private readonly syntaxValidator?: SyntaxValidationService,
@Optional()
private readonly appStateService?: ApplicationStateService,
) {}
getMetadata(): ToolMetadata {
return {
name: this.toolName,
description: this.getDefinition(true),
arguments: [
{
name: 'file_path',
type: 'string',
description: 'The relative path to the file to be overwritten.',
required: true,
},
{
name: 'content',
type: 'string',
description: 'The new, complete content for the file.',
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 exampleContent = `\`\`\`typescript
/**
* Global application configuration.
*/
export const AppConfig = Object.freeze({
// Feature flags
ENABLE_ANALYTICS: process.env.NODE_ENV === 'production',
ENABLE_FEATURE_X: true,
// API endpoints
API_BASE_URL: process.env.API_URL || 'https://api.example.com',
API_TIMEOUT: parseInt(process.env.API_TIMEOUT || '5000', 10),
// Third-party service keys
SENTRY_DSN: process.env.SENTRY_DSN,
});
\`\`\``.trim();
const example = this.generateExample(
{
tool_name: this.toolName,
file_path: 'src/config/app.config.ts',
content: exampleContent,
},
useJsonFormat,
);
const badExampleContent = `\`\`\`typescript
// This is wrong! Only a partial snippet is provided.
NEW_API_KEY: 'ABC-123',
\`\`\``.trim();
const badExample = this.generateExample(
{
tool_name: this.toolName,
file_path: 'src/config/app.config.ts',
content: badExampleContent,
},
useJsonFormat,
);
const definition = `
-------------
### ${this.toolName}
Overwrites an existing file with new content. This is a destructive operation that replaces the **entire file**.
You MUST provide the full, final content of the file. NEVER EVER provide only a snippet or partial content, as that will result in loss of data.
#### Parameters
- "file_path": (string) The relative path to the file to be overwritten.
- "content": (string) The new, complete content for the file.
#### Example
Explanation: Refactor the entire 'app.config.ts' to a new, more structured format.
:${example}
#### Bad Example
Explanation: This is an incorrect use case. The 'content' field only contains a small snippet, not the entire file. This tool would wipe the original file and replace it with only the new lines, which is not the intended outcome.
:${badExample}
-------------
`;
return `\n${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; // File doesn't exist, which is valid for overwrite.
}
throw error;
}
}
async execute(
args: { [key: string]: any },
_context: PlanExecutionContext,
): Promise<ActionExecutionResult> {
const validatedArgs = plainToClass(OverwriteFileArgsDto, 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 ${this.toolName}.`,
error_message: errorMessages,
persisted_args: args,
execution_log: { output: '', error_message: errorMessages },
};
}
const { file_path, content } = validatedArgs;
const safePath = this.resolveAndValidatePath(file_path);
const originalContent = await this.readFileContent(safePath);
try {
await fs.mkdir(path.dirname(safePath), { recursive: true });
await fs.writeFile(safePath, content, 'utf8');
// Syntax validation after file overwrite
if (this.syntaxValidator && this.appStateService) {
const isValidationEnabled =
await this.appStateService.getSyntaxValidationEnabled();
if (isValidationEnabled) {
const validationError = await this.syntaxValidator.validate(
file_path,
content,
);
Iif (validationError) {
this.logger.warn(
`Syntax validation failed for overwritten file "${file_path}"`,
);
let errorMessage =
this.syntaxValidator.formatErrors(validationError);
errorMessage += `\n**CORRECTION:** Your overwrite introduced syntax errors. The original file content has been restored. `;
errorMessage += `Use \`overwrite_file\` again with the complete, corrected content. `;
errorMessage += `Remember: \`overwrite_file\` replaces the ENTIRE file - provide the full final content, not just the changed portion.`;
// Restore original content to prevent corruption
if (originalContent !== null) {
await fs.writeFile(safePath, originalContent, 'utf8');
} else {
// If no original content existed, delete the corrupted file
await fs.unlink(safePath).catch(() => {});
}
return {
status: 'FAILURE',
summary: `File "${file_path}" contains syntax errors and was reverted.`,
error_message: errorMessage,
persisted_args: validatedArgs,
execution_log: { output: '', error_message: errorMessage },
};
}
}
}
return {
status: 'SUCCESS',
summary: `File "${file_path}" overwritten.`,
persisted_args: { file_path, content },
original_content_for_revert: originalContent,
execution_log: {
output: `${file_path} has been overwritten.`,
error_message: '',
},
};
} catch (error) {
this.logger.error(
`Failed to overwrite file at ${file_path}: ${error.message}`,
);
throw new InternalServerErrorException(
`Failed to overwrite file "${file_path}": ${error.message}`,
);
}
}
}
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