/**
 * XML Processing Utility
 *
 * Handles downloading, validating, and processing XML files with security.
 *
 * Security Notes:
 * ---------------
 * XML parsing can be vulnerable to XML External Entity (XXE) attacks:
 *
 * 1. **XXE Attacks**: DOCTYPE and ENTITY declarations can be exploited to:
 *    - Read local files on the server
 *    - Perform Server-Side Request Forgery (SSRF)
 *    - Cause Denial of Service via entity expansion
 *
 * 2. **Mitigation**: We reject XML files containing DOCTYPE or ENTITY declarations
 *    and disable entity processing in the parser.
 *
 * References:
 * - https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing
 * - https://cwe.mitre.org/data/definitions/611.html (XXE)
 *
 * @module processors/data/XmlProcessor
 *
 * @example
 * ```typescript
 * import { xmlProcessor, isXmlFile, processXml } from "./XmlProcessor.js";
 *
 * // Check if file is XML
 * if (isXmlFile("application/xml", "data.xml")) {
 *   // Process the file
 *   const result = await processXml(fileInfo);
 *   if (result.success && result.data) {
 *     console.log("Root element:", result.data.rootElement);
 *     console.log("Parsed:", result.data.parsed);
 *   }
 * }
 * ```
 */
import { BaseFileProcessor } from "../base/BaseFileProcessor.js";
import type { FileInfo, ProcessorFileProcessingResult, ProcessorOperationResult, ProcessOptions, ProcessedXml } from "../../types/index.js";
/**
 * XML file processor.
 * Extends BaseFileProcessor with XML-specific parsing and validation.
 *
 * Features:
 * - XXE protection (rejects DOCTYPE and ENTITY declarations)
 * - Parses XML to JavaScript objects
 * - Extracts root element name
 *
 * @example
 * ```typescript
 * const processor = new XmlProcessor();
 *
 * const result = await processor.processFile({
 *   id: "file-123",
 *   name: "data.xml",
 *   mimetype: "application/xml",
 *   size: 1024,
 *   buffer: xmlBuffer,
 * });
 *
 * if (result.success && result.data?.valid) {
 *   console.log("Root element:", result.data.rootElement);
 * }
 * ```
 */
export declare class XmlProcessor extends BaseFileProcessor<ProcessedXml> {
    constructor();
    /**
     * Extract the root element name from XML content.
     *
     * @param content - XML content string
     * @returns Root element name or undefined if not found
     */
    private extractRootElement;
    /**
     * Check if XML content contains XXE attack vectors.
     *
     * @param content - XML content string
     * @returns Object with detection results
     */
    private checkXxeVectors;
    /**
     * Parse XML content to JavaScript object securely.
     *
     * @param content - XML content string
     * @returns Parsed XML content
     */
    private parseXmlSecurely;
    /**
     * Validate downloaded XML is parseable and safe with structured error result.
     * Includes XXE protection by rejecting XML with DOCTYPE or ENTITY declarations.
     * Returns user-friendly error messages with actionable suggestions.
     *
     * @param buffer - Downloaded file content
     * @param fileInfo - Original file information
     * @returns Success result or error result
     */
    protected validateDownloadedFileWithResult(buffer: Buffer, fileInfo: FileInfo): Promise<ProcessorOperationResult<void>>;
    /**
     * Build processed XML result with parsed content.
     *
     * @param buffer - Downloaded file content
     * @param fileInfo - Original file information
     * @returns Processed XML result
     */
    protected buildProcessedResult(buffer: Buffer, fileInfo: FileInfo): ProcessedXml;
}
/** Singleton XML processor instance */
export declare const xmlProcessor: XmlProcessor;
/**
 * Check if a file is an XML file based on MIME type or extension.
 *
 * @param mimetype - MIME type of the file
 * @param filename - Filename (for extension-based detection)
 * @returns true if the file is an XML file
 *
 * @example
 * ```typescript
 * if (isXmlFile("application/xml", "data.xml")) {
 *   // Process as XML
 * }
 * ```
 */
export declare function isXmlFile(mimetype: string, filename: string): boolean;
/**
 * Validate XML file size against configured limit.
 *
 * @param sizeBytes - File size in bytes
 * @returns true if size is within the limit
 */
export declare function validateXmlSize(sizeBytes: number): boolean;
/**
 * Process a single XML file with XXE protection.
 *
 * @param fileInfo - File information (with URL or buffer)
 * @param options - Optional processing options (auth headers, timeout, retry config)
 * @returns Processing result with parsed XML or error
 *
 * @example
 * ```typescript
 * const result = await processXml({
 *   id: "file-123",
 *   name: "data.xml",
 *   mimetype: "application/xml",
 *   size: 2048,
 *   url: "https://example.com/data.xml",
 * }, {
 *   authHeaders: { "Authorization": "Bearer token" },
 * });
 *
 * if (result.success && result.data) {
 *   console.log("Root:", result.data.rootElement);
 *   console.log("Parsed:", result.data.parsed);
 * }
 * ```
 */
export declare function processXml(fileInfo: FileInfo, options?: ProcessOptions): Promise<ProcessorFileProcessingResult<ProcessedXml>>;