closed-social
/
gitea

// Copyright 2013 Martini Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.

package macaron
import (	"bytes"	"fmt"	"io/ioutil"	"log"	"net/http"	"runtime"
	"github.com/go-macaron/inject")
const (	panicHtml = `<html><head><title>PANIC: %s</title><meta charset="utf-8" /><style type="text/css">html, body {	font-family: "Roboto", sans-serif;	color: #333333;	background-color: #ea5343;	margin: 0px;}h1 {	color: #d04526;	background-color: #ffffff;	padding: 20px;	border-bottom: 1px dashed #2b3848;}pre {	margin: 20px;	padding: 20px;	border: 2px solid #2b3848;	background-color: #ffffff;	white-space: pre-wrap;       /* css-3 */	white-space: -moz-pre-wrap;  /* Mozilla, since 1999 */	white-space: -pre-wrap;      /* Opera 4-6 */	white-space: -o-pre-wrap;    /* Opera 7 */	word-wrap: break-word;       /* Internet Explorer 5.5+ */}</style></head><body><h1>PANIC</h1><pre style="font-weight: bold;">%s</pre><pre>%s</pre></body></html>`)
var (	dunno     = []byte("???")	centerDot = []byte("·")	dot       = []byte(".")	slash     = []byte("/"))
// stack returns a nicely formated stack frame, skipping skip frames
func stack(skip int) []byte {	buf := new(bytes.Buffer) // the returned data
	// As we loop, we open files and read them. These variables record the currently
	// loaded file.
	var lines [][]byte	var lastFile string	for i := skip; ; i++ { // Skip the expected number of frames
		pc, file, line, ok := runtime.Caller(i)		if !ok {			break		}		// Print this much at least.  If we can't find the source, it won't show.
		fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)		if file != lastFile {			data, err := ioutil.ReadFile(file)			if err != nil {				continue			}			lines = bytes.Split(data, []byte{'\n'})			lastFile = file		}		fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))	}	return buf.Bytes()}
// 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 dunno	}	return bytes.TrimSpace(lines[n])}
// function returns, if possible, the name of the function containing the PC.
func function(pc uintptr) []byte {	fn := runtime.FuncForPC(pc)	if fn == nil {		return dunno	}	name := []byte(fn.Name())	// The name includes the path name to the package, which is unnecessary
	// since the file name is already included.  Plus, it has center dots.
	// That is, we see
	//	runtime/debug.*T·ptrmethod
	// and want
	//	*T.ptrmethod
	// Also the package path might contains dot (e.g. code.google.com/...),
	// so first eliminate the path prefix
	if lastslash := bytes.LastIndex(name, slash); lastslash >= 0 {		name = name[lastslash+1:]	}	if period := bytes.Index(name, dot); period >= 0 {		name = name[period+1:]	}	name = bytes.Replace(name, centerDot, dot, -1)	return name}
// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
// While Martini is in development mode, Recovery will also output the panic as HTML.
func Recovery() Handler {	return func(c *Context, log *log.Logger) {		defer func() {			if err := recover(); err != nil {				stack := stack(3)				log.Printf("PANIC: %s\n%s", err, stack)
				// Lookup the current responsewriter
				val := c.GetVal(inject.InterfaceOf((*http.ResponseWriter)(nil)))				res := val.Interface().(http.ResponseWriter)
				// respond with panic message while in development mode
				var body []byte				if Env == DEV {					res.Header().Set("Content-Type", "text/html")					body = []byte(fmt.Sprintf(panicHtml, err, err, stack))				}
				res.WriteHeader(http.StatusInternalServerError)				if nil != body {					res.Write(body)				}			}		}()
		c.Next()	}}