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/*
 *  Phusion Passenger - https://www.phusionpassenger.com/
 *  Copyright (c) 2012-2025 Asynchronous B.V.
 *
 *  "Passenger", "Phusion Passenger" and "Union Station" are registered
 *  trademarks of Asynchronous B.V.
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */
#ifndef _PASSENGER_SERVER_KIT_ERRORS_H_
#define _PASSENGER_SERVER_KIT_ERRORS_H_

#include <cstring>
#include <ServerKit/llhttp.h>
#include <ServerKit/llerrors.h>

namespace Passenger {
namespace ServerKit {


enum Error {
	// HttpChunkedBodyParser errors
	CHUNK_SIZE_TOO_LARGE        = -1000,
	CHUNK_SIZE_PARSE_ERROR      = -1001,
	CHUNK_FOOTER_PARSE_ERROR    = -1002,
	CHUNK_FINALIZER_PARSE_ERROR = -1003,
	UNEXPECTED_EOF              = -1004,

	// HttpHeaderParser errors
	HTTP_VERSION_NOT_SUPPORTED                             = -1010,
	REQUEST_CONTAINS_CONTENT_LENGTH_AND_TRANSFER_ENCODING  = -1011,
	UPGRADE_NOT_ALLOWED_WHEN_REQUEST_BODY_EXISTS           = -1012,
	UPGRADE_NOT_ALLOWED_FOR_HEAD_REQUESTS                  = -1013,
	RESPONSE_CONTAINS_CONTENT_LENGTH_AND_TRANSFER_ENCODING = -1014,
	SECURITY_PASSWORD_MISMATCH                             = -1015,
	SECURITY_PASSWORD_DUPLICATE                            = -1016,
	ERROR_SECURE_HEADER_NOT_ALLOWED                        = -1017,
	NORMAL_HEADER_NOT_ALLOWED_AFTER_SECURITY_PASSWORD      = -1018,

	// HttpServer special errors
	EARLY_EOF_DETECTED          = -1020,

	// Error codes below -2000 are http_parser errors
	HTTP_PARSER_ERRNO_BEGIN     = -2000,
};

inline const char *
getErrorDesc(int errcode) {
	switch (errcode) {
	case CHUNK_SIZE_TOO_LARGE:
		return "Chunked encoding size too large";
	case CHUNK_SIZE_PARSE_ERROR:
		return "Chunked encoding size string parse error";
	case CHUNK_FOOTER_PARSE_ERROR:
		return "Chunked encoding footer parse error";
	case CHUNK_FINALIZER_PARSE_ERROR:
		return "Chunked encoding final chunk parse error";
	case UNEXPECTED_EOF:
		return "Unexpected end-of-stream";
	case HTTP_VERSION_NOT_SUPPORTED:
		return "HTTP Version Not Supported";
	case REQUEST_CONTAINS_CONTENT_LENGTH_AND_TRANSFER_ENCODING:
		return "Bad request (request may not contain both Content-Length and Transfer-Encoding)";
	case UPGRADE_NOT_ALLOWED_WHEN_REQUEST_BODY_EXISTS:
		return "Bad request (Connection upgrading is only allowed for requests without request body)";
	case UPGRADE_NOT_ALLOWED_FOR_HEAD_REQUESTS:
		return "Bad request (Connection upgrading is not allowed for HEAD requests)";
	case RESPONSE_CONTAINS_CONTENT_LENGTH_AND_TRANSFER_ENCODING:
		return "Response may not contain both Content-Length and Transfer-Encoding";
	case SECURITY_PASSWORD_MISMATCH:
		return "Security password mismatch";
	case SECURITY_PASSWORD_DUPLICATE:
		return "A duplicate security password header was encountered";
	case ERROR_SECURE_HEADER_NOT_ALLOWED:
		return "A secure header was provided, but no security password was provided";
	case NORMAL_HEADER_NOT_ALLOWED_AFTER_SECURITY_PASSWORD:
		return "A normal header was encountered after the security password header";
	case EARLY_EOF_DETECTED:
		return "The client connection is closed before the request is done processing";
	default:
		if (errcode <= HTTP_PARSER_ERRNO_BEGIN) {
			return llhttp_get_error_description((llhttp_errno_t)
				(-errcode + HTTP_PARSER_ERRNO_BEGIN));
		} else {
			return std::strerror(errcode);
		}
	}
}


} // namespace ServerKit
} // namespace Passenger

#endif /* _PASSENGER_SERVER_KIT_ERRORS_H_ */