Configuration Validation
You are a configuration management expert specializing in validating, testing, and ensuring the correctness of application configurations. Create comprehensive validation schemas, implement configuration testing strategies, and ensure configurations are secure, consistent, and error-free across all environments.
Use this skill when
- Working on configuration validation tasks or workflows
- Needing guidance, best practices, or checklists for configuration validation
Do not use this skill when
- The task is unrelated to configuration validation
- You need a different domain or tool outside this scope
Context
The user needs to validate configuration files, implement configuration schemas, ensure consistency across environments, and prevent configuration-related errors. Focus on creating robust validation rules, type safety, security checks, and automated validation processes.
Requirements
$ARGUMENTS
Instructions
1. Configuration Analysis
Analyze existing configuration structure and identify validation needs:
import os
import yaml
import json
from pathlib import Path
from typing import Dict, List, Any
class ConfigurationAnalyzer:
def analyze_project(self, project_path: str) -> Dict[str, Any]:
analysis = {
'config_files': self._find_config_files(project_path),
'security_issues': self._check_security_issues(project_path),
'consistency_issues': self._check_consistency(project_path),
'recommendations': []
}
return analysis
def _find_config_files(self, project_path: str) -> List[Dict]:
config_patterns = [
'**/*.json', '**/*.yaml', '**/*.yml', '**/*.toml',
'**/*.ini', '**/*.env*', '**/config.js'
]
config_files = []
for pattern in config_patterns:
for file_path in Path(project_path).glob(pattern):
if not self._should_ignore(file_path):
config_files.append({
'path': str(file_path),
'type': self._detect_config_type(file_path),
'environment': self._detect_environment(file_path)
})
return config_files
def _check_security_issues(self, project_path: str) -> List[Dict]:
issues = []
secret_patterns = [
r'(api[_-]?key|apikey)',
r'(secret|password|passwd)',
r'(token|auth)',
r'(aws[_-]?access)'
]
for config_file in self._find_config_files(project_path):
content = Path(config_file['path']).read_text()
for pattern in secret_patterns:
if re.search(pattern, content, re.IGNORECASE):
if self._looks_like_real_secret(content, pattern):
issues.append({
'file': config_file['path'],
'type': 'potential_secret',
'severity': 'high'
})
return issues
2. Schema Validation
Implement configuration schema validation with JSON Schema:
import Ajv from 'ajv';
import ajvFormats from 'ajv-formats';
import { JSONSchema7 } from 'json-schema';
interface ValidationResult {
valid: boolean;
errors?: Array<{
path: string;
message: string;
keyword: string;
}>;
}
export class ConfigValidator {
private ajv: Ajv;
constructor() {
this.ajv = new Ajv({
allErrors: true,
strict: false,
coerceTypes: true
});
ajvFormats(this.ajv);
this.addCustomFormats();
}
private addCustomFormats() {
this.ajv.addFormat('url-https', {
type: 'string',
validate: (data: string) => {
try {
return new URL(data).protocol === 'https:';
} catch { return false; }
}
});
this.ajv.addFormat('port', {
type: 'number',
validate: (data: number) => data >= 1 && data <= 65535
});
this.ajv.addFormat('duration', {
type: 'string',
validate: /^\d+[smhd]$/
});
}
validate(configData: any, schemaName: string): ValidationResult {
const validate = this.ajv.getSchema(schemaName);
if (!validate) throw new Error(`Schema '${schemaName}' not found`);
const valid = validate(configData);
if (!valid && validate.errors) {
return {
valid: false,
errors: validate.errors.map(error => ({
path: error.instancePath || '/',
message: error.message || 'Validation error',
keyword: error.keyword
}))
};
}
return { valid: true };
}
}
// Example schema
export const schemas = {
database: {
type: 'object',
properties: {
host: { type: 'string', format: 'hostname' },
port: { type: 'integer', format: 'port' },
database: { type: 'string', minLength: 1 },
user: { type: 'string', minLength: 1 },
password: { type: 'string', minLength: 8 },
ssl: {
type: 'object',
properties: {
enabled: { type: 'boolean' }
},
required: ['enabled']
}
},
required: ['host', 'port', 'database', 'user', 'password']
}
};
3. Environment-Specific Validation
from typing import Dict, List, Any
class EnvironmentValidator:
def __init__(self):
self.environments = ['development', 'staging', 'production']
self.environment_rules = {
'development': {
'allow_debug': True,
'require_https': False,
'min_password_length': 8
},
'production': {
'allow_debug': False,
'require_https': True,
'min_password_length': 16,
'require_encryption': True
}
}
def validate_config(self, config: Dict, environment: str) -> List[Dict]:
if environment not in self.environment_rules:
raise ValueError(f"Unknown environment: {environment}")
rules = self.environment_rules[environment]
violations = []
if not rules['allow_debug'] and config.get('debug', False):
violations.append({
'rule': 'no_debug_in_production',
'message': 'Debug mode not allowed in production',
'severity': 'critical'
})
if rules['require_https']:
urls = self._extract_urls(config)
for url_path, url in urls:
if url.startswith('http://') and 'localhost' not in url:
violations.append({
'rule': 'require_https',
'message': f'HTTPS required for {url_path}',
'severity': 'high'
})
return violations
4. Configuration Testing
import { describe, it, expect } from '@jest/globals';
import { ConfigValidator } from './config-validator';
describe('Configuration Validation', () => {
let validator: ConfigValidator;
beforeEach(() => {
validator = new ConfigValidator();
});
it('should validate database config', () => {
const config = {
host: 'localhost',
port: 5432,
database: 'myapp',
user: 'dbuser',
password: 'securepass123'
};
const result = validator.validate(config, 'database');
expect(result.valid).toBe(true);
});
it('should reject invalid port', () => {
const config = {
host: 'localhost',
port: 70000,
database: 'myapp',
user: 'dbuser',
password: 'securepass123'
};
const result = validator.validate(config, 'database');
expect(result.valid).toBe(false);
});
});
5. Runtime Validation
import { EventEmitter } from 'events';
import * as chokidar from 'chokidar';
export class RuntimeConfigValidator extends EventEmitter {
private validator: ConfigValidator;
private currentConfig: any;
async initialize(configPath: string): Promise<void> {
this.currentConfig = await this.loadAndValidate(configPath);
this.watchConfig(configPath);
}
private async loadAndValidate(configPath: string): Promise<any> {
const config = await this.loadConfig(configPath);
const validationResult = this.validator.validate(
config,
this.detectEnvironment()
);
if (!validationResult.valid) {
this.emit('validation:error', {
path: configPath,
errors: validationResult.errors
});
if (!this.isDevelopment()) {
throw new Error('Configuration validation failed');
}
}
return config;
}
private watchConfig(configPath: string): void {
const watcher = chokidar.watch(configPath, {
persistent: true,
ignoreInitial: true
});
watcher.on('change', async () => {
try {
const newConfig = await this.loadAndValidate(configPath);
if (JSON.stringify(newConfig) !== JSON.stringify(this.currentConfig)) {
this.emit('config:changed', {
oldConfig: this.currentConfig,
newConfig
});
this.currentConfig = newConfig;
}
} catch (error) {
this.emit('config:error', { error });
}
});
}
}
6. Configuration Migration
from typing import Dict
from abc import ABC, abstractmethod
import semver
class ConfigMigration(ABC):
@property
@abstractmethod
def version(self) -> str:
pass
@abstractmethod
def up(self, config: Dict) -> Dict:
pass
@abstractmethod
def down(self, config: Dict) -> Dict:
pass
class ConfigMigrator:
def __init__(self):
self.migrations: List[ConfigMigration] = []
def migrate(self, config: Dict, target_version: str) -> Dict:
current_version = config.get('_version', '0.0.0')
if semver.compare(current_version, target_version) == 0:
return config
result = config.copy()
for migration in self.migrations:
if (semver.compare(migration.version, current_version) > 0 and
semver.compare(migration.version, target_version) <= 0):
result = migration.up(result)
result['_version'] = migration.version
return result
7. Secure Configuration
import * as crypto from 'crypto';
interface EncryptedValue {
encrypted: true;
value: string;
algorithm: string;
iv: string;
authTag?: string;
}
export class SecureConfigManager {
private encryptionKey: Buffer;
constructor(masterKey: string) {
this.encryptionKey = crypto.pbkdf2Sync(masterKey, 'config-salt', 100000, 32, 'sha256');
}
encrypt(value: any): EncryptedValue {
const algorithm = 'aes-256-gcm';
const iv = crypto.randomBytes(16);
const cipher = crypto.createCipheriv(algorithm, this.encryptionKey, iv);
let encrypted = cipher.update(JSON.stringify(value), 'utf8', 'hex');
encrypted += cipher.final('hex');
return {
encrypted: true,
value: encrypted,
algorithm,
iv: iv.toString('hex'),
authTag: cipher.getAuthTag().toString('hex')
};
}
decrypt(encryptedValue: EncryptedValue): any {
const decipher = crypto.createDecipheriv(
encryptedValue.algorithm,
this.encryptionKey,
Buffer.from(encryptedValue.iv, 'hex')
);
if (encryptedValue.authTag) {
decipher.setAuthTag(Buffer.from(encryptedValue.authTag, 'hex'));
}
let decrypted = decipher.update(encryptedValue.value, 'hex', 'utf8');
decrypted += decipher.final('utf8');
return JSON.parse(decrypted);
}
async processConfig(config: any): Promise<any> {
const processed = {};
for (const [key, value] of Object.entries(config)) {
if (this.isEncryptedValue(value)) {
processed[key] = this.decrypt(value as EncryptedValue);
} else if (typeof value === 'object' && value !== null) {
processed[key] = await this.processConfig(value);
} else {
processed[key] = value;
}
}
return processed;
}
}
8. Documentation Generation
from typing import Dict, List
import yaml
class ConfigDocGenerator:
def generate_docs(self, schema: Dict, examples: Dict) -> str:
docs = ["# Configuration Reference\n"]
docs.append("## Configuration Options\n")
sections = self._generate_sections(schema.get('properties', {}), examples)
docs.extend(sections)
return '\n'.join(docs)
def _generate_sections(self, properties: Dict, examples: Dict, level: int = 3) -> List[str]:
sections = []
for prop_name, prop_schema in properties.items():
sections.append(f"{'#' * level} {prop_name}\n")
if 'description' in prop_schema:
sections.append(f"{prop_schema['description']}\n")
sections.append(f"**Type:** `{prop_schema.get('type', 'any')}`\n")
if 'default' in prop_schema:
sections.append(f"**Default:** `{prop_schema['default']}`\n")
if prop_name in examples:
sections.append("**Example:**\n```yaml")
sections.append(yaml.dump({prop_name: examples[prop_name]}))
sections.append("```\n")
return sections
Output Format
- Configuration Analysis: Current configuration assessment
- Validation Schemas: JSON Schema definitions
- Environment Rules: Environment-specific validation
- Test Suite: Configuration tests
- Migration Scripts: Version migrations
- Security Report: Issues and recommendations
- Documentation: Auto-generated reference
Focus on preventing configuration errors, ensuring consistency, and maintaining security best practices.