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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 { CreateFileArgsDto } from './dto/create-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 CreateFileHandler implements ActionHandler {
readonly toolName = 'create_file';
private readonly logger = new Logger(CreateFileHandler.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 for the new file.',
required: true,
},
{
name: 'content',
type: 'string',
description: 'The full content of the new 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
import { v4 as uuidv4 } from 'uuid';
export interface UserProfile {
id: string;
username: string;
email: string;
createdAt: Date;
}
/**
* Creates a new user profile with a unique ID and creation date.
* @param username The user's chosen username.
* @param email The user's email address.
* @returns A new UserProfile object.
*/
export function createProfile(username: string, email: string): UserProfile {
return {
id: uuidv4(),
username,
email,
createdAt: new Date(),
};
}
\`\`\``.trim();
const example = this.generateExample(
{
tool_name: this.toolName,
file_path: 'src/modules/users/profiles.util.ts',
content: exampleContent,
},
useJsonFormat,
);
const definition = `
-------------
### ${this.toolName}
Creates a new file with the specified content. It will create any necessary parent directories.
#### Parameters
- "file_path": (string) The relative path for the new file.
- "content": (string) The full content of the new file.
#### Example
Explanation: Create a new utility file for creating user profiles.
:${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;
}
async execute(
args: { [key: string]: any },
_context: PlanExecutionContext,
): Promise<ActionExecutionResult> {
const validatedArgs = plainToClass(CreateFileArgsDto, 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 ${this.toolName}.`,
error_message: errorMessages,
persisted_args: args,
execution_log: { output: '', error_message: errorMessages },
};
}
const { file_path, content } = validatedArgs;
const safePath = this.resolveAndValidatePath(file_path);
try {
await fs.mkdir(path.dirname(safePath), { recursive: true });
await fs.writeFile(safePath, content, 'utf8');
// Syntax validation after file creation
if (this.syntaxValidator && this.appStateService) {
const isValidationEnabled =
await this.appStateService.getSyntaxValidationEnabled();
if (isValidationEnabled) {
const validationError = await this.syntaxValidator.validate(
file_path,
content,
);
Iif (validationError) {
this.logger.warn(
`Syntax validation failed for newly created file "${file_path}"`,
);
let errorMessage =
this.syntaxValidator.formatErrors(validationError);
errorMessage += `\n**CORRECTION:** The file content you provided contains syntax errors. `;
errorMessage += `Please review the errors above and fix the syntax issues. `;
errorMessage += `Common issues include: missing closing brackets/braces, unclosed strings, malformed imports, or invalid operators. `;
errorMessage += `Use \`create_file\` again with the corrected content.`;
// Delete corrupted file to prevent it from persisting
await fs.unlink(safePath).catch(() => {
// Ignore deletion errors
});
return {
status: 'FAILURE',
summary: `File "${file_path}" contains syntax errors and was not saved.`,
error_message: errorMessage,
persisted_args: validatedArgs,
execution_log: { output: '', error_message: errorMessage },
};
}
}
}
return {
status: 'SUCCESS',
summary: `File "${file_path}" created.`,
persisted_args: { file_path, content },
execution_log: {
output: `${file_path} has been created.`,
error_message: '',
},
};
} catch (error) {
this.logger.error(
`Failed to create file at ${file_path}: ${error.message}`,
);
throw new InternalServerErrorException(
`Failed to create file "${file_path}": ${error.message}`,
);
}
}
}
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