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path: root/modules/log/stack.go
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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package log

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"runtime"
)

var (
	unknown = []byte("???")
)

// Stack will skip back the provided number of frames and return a stack trace with source code.
// Although we could just use debug.Stack(), this routine will return the source code and
// skip back the provided number of frames - i.e. allowing us to ignore preceding function calls.
// A skip of 0 returns the stack trace for the calling function, not including this call.
// If the problem is a lack of memory of course all this is not going to work...
func Stack(skip int) string {
	buf := new(bytes.Buffer)

	// Store the last file we opened as its probable that the preceding stack frame
	// will be in the same file
	var lines [][]byte
	var lastFilename string
	for i := skip + 1; ; i++ { // Skip over frames
		programCounter, filename, lineNumber, ok := runtime.Caller(i)
		// If we can't retrieve the information break - basically we're into go internals at this point.
		if !ok {
			break
		}

		// Print equivalent of debug.Stack()
		fmt.Fprintf(buf, "%s:%d (0x%x)\n", filename, lineNumber, programCounter)
		// Now try to print the offending line
		if filename != lastFilename {
			data, err := ioutil.ReadFile(filename)
			if err != nil {
				// can't read this sourcefile
				// likely we don't have the sourcecode available
				continue
			}
			lines = bytes.Split(data, []byte{'\n'})
			lastFilename = filename
		}
		fmt.Fprintf(buf, "\t%s: %s\n", functionName(programCounter), source(lines, lineNumber))
	}
	return buf.String()
}

// functionName converts the provided programCounter into a function name
func functionName(programCounter uintptr) []byte {
	function := runtime.FuncForPC(programCounter)
	if function == nil {
		return unknown
	}
	name := []byte(function.Name())

	// Because we provide the filename we can drop the preceding package name.
	if lastslash := bytes.LastIndex(name, []byte("/")); lastslash >= 0 {
		name = name[lastslash+1:]
	}
	// And the current package name.
	if period := bytes.Index(name, []byte(".")); period >= 0 {
		name = name[period+1:]
	}
	// And we should just replace the interpunct with a dot
	name = bytes.Replace(name, []byte("·"), []byte("."), -1)
	return name
}

// source returns a space-trimmed slice of the n'th line.
func source(lines [][]byte, n int) []byte {
	n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
	if n < 0 || n >= len(lines) {
		return unknown
	}
	return bytes.TrimSpace(lines[n])
}
t/48207/stable30 Nextcloud server, a safe home for all your data: https://github.com/nextcloud/serverwww-data
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path: root/index.php
blob: 7b62f17e5bd589bfb088039b3b80891e221ae938 (plain)
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<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Sergio Bertolín <sbertolin@solidgear.es>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Vincent Petry <vincent@nextcloud.com>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 *
 */
require_once __DIR__ . '/lib/versioncheck.php';

try {
	require_once __DIR__ . '/lib/base.php';

	OC::handleRequest();
} catch (\OC\ServiceUnavailableException $ex) {
	\OC::$server->getLogger()->logException($ex, ['app' => 'index']);

	//show the user a detailed error page
	OC_Template::printExceptionErrorPage($ex, 503);
} catch (\OCP\HintException $ex) {
	try {
		OC_Template::printErrorPage($ex->getMessage(), $ex->getHint(), 503);
	} catch (Exception $ex2) {
		try {
			\OC::$server->getLogger()->logException($ex, ['app' => 'index']);
			\OC::$server->getLogger()->logException($ex2, ['app' => 'index']);
		} catch (Throwable $e) {
			// no way to log it properly - but to avoid a white page of death we try harder and ignore this one here
		}

		//show the user a detailed error page
		OC_Template::printExceptionErrorPage($ex, 500);
	}
} catch (\OC\User\LoginException $ex) {
	$request = \OC::$server->getRequest();
	/**
	 * Routes with the @CORS annotation and other API endpoints should
	 * not return a webpage, so we only print the error page when html is accepted,
	 * otherwise we reply with a JSON array like the SecurityMiddleware would do.
	 */
	if (stripos($request->getHeader('Accept'), 'html') === false) {
		http_response_code(401);
		header('Content-Type: application/json; charset=utf-8');
		echo json_encode(['message' => $ex->getMessage()]);
		exit();
	}
	OC_Template::printErrorPage($ex->getMessage(), $ex->getMessage(), 401);
} catch (Exception $ex) {
	\OC::$server->getLogger()->logException($ex, ['app' => 'index']);

	//show the user a detailed error page
	OC_Template::printExceptionErrorPage($ex, 500);
} catch (Error $ex) {
	try {
		\OC::$server->getLogger()->logException($ex, ['app' => 'index']);
	} catch (Error $e) {
		http_response_code(500);
		header('Content-Type: text/plain; charset=utf-8');
		print("Internal Server Error\n\n");
		print("The server encountered an internal error and was unable to complete your request.\n");
		print("Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.\n");
		print("More details can be found in the webserver log.\n");

		throw $ex;
	}
	OC_Template::printExceptionErrorPage($ex, 500);
}