mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-25 17:56:34 +08:00
118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy 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 caddyhttp
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
weakrand "math/rand"
|
|
"path"
|
|
"runtime"
|
|
"strings"
|
|
|
|
"github.com/caddyserver/caddy/v2"
|
|
)
|
|
|
|
// Error is a convenient way for a Handler to populate the
|
|
// essential fields of a HandlerError. If err is itself a
|
|
// HandlerError, then any essential fields that are not
|
|
// set will be populated.
|
|
func Error(statusCode int, err error) HandlerError {
|
|
const idLen = 9
|
|
var he HandlerError
|
|
if errors.As(err, &he) {
|
|
if he.ID == "" {
|
|
he.ID = randString(idLen, true)
|
|
}
|
|
if he.Trace == "" {
|
|
he.Trace = trace()
|
|
}
|
|
if he.StatusCode == 0 {
|
|
he.StatusCode = statusCode
|
|
}
|
|
return he
|
|
}
|
|
return HandlerError{
|
|
ID: randString(idLen, true),
|
|
StatusCode: statusCode,
|
|
Err: err,
|
|
Trace: trace(),
|
|
}
|
|
}
|
|
|
|
// HandlerError is a serializable representation of
|
|
// an error from within an HTTP handler.
|
|
type HandlerError struct {
|
|
Err error // the original error value and message
|
|
StatusCode int // the HTTP status code to associate with this error
|
|
|
|
ID string // generated; for identifying this error in logs
|
|
Trace string // produced from call stack
|
|
}
|
|
|
|
func (e HandlerError) Error() string {
|
|
var s string
|
|
if e.ID != "" {
|
|
s += fmt.Sprintf("{id=%s}", e.ID)
|
|
}
|
|
if e.Trace != "" {
|
|
s += " " + e.Trace
|
|
}
|
|
if e.StatusCode != 0 {
|
|
s += fmt.Sprintf(": HTTP %d", e.StatusCode)
|
|
}
|
|
if e.Err != nil {
|
|
s += ": " + e.Err.Error()
|
|
}
|
|
return strings.TrimSpace(s)
|
|
}
|
|
|
|
// Unwrap returns the underlying error value. See the `errors` package for info.
|
|
func (e HandlerError) Unwrap() error { return e.Err }
|
|
|
|
// randString returns a string of n random characters.
|
|
// It is not even remotely secure OR a proper distribution.
|
|
// But it's good enough for some things. It excludes certain
|
|
// confusing characters like I, l, 1, 0, O, etc. If sameCase
|
|
// is true, then uppercase letters are excluded.
|
|
func randString(n int, sameCase bool) string {
|
|
if n <= 0 {
|
|
return ""
|
|
}
|
|
dict := []byte("abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRTUVWXY23456789")
|
|
if sameCase {
|
|
dict = []byte("abcdefghijkmnpqrstuvwxyz0123456789")
|
|
}
|
|
b := make([]byte, n)
|
|
for i := range b {
|
|
//nolint:gosec
|
|
b[i] = dict[weakrand.Int63()%int64(len(dict))]
|
|
}
|
|
return string(b)
|
|
}
|
|
|
|
func trace() string {
|
|
if pc, file, line, ok := runtime.Caller(2); ok {
|
|
filename := path.Base(file)
|
|
pkgAndFuncName := path.Base(runtime.FuncForPC(pc).Name())
|
|
return fmt.Sprintf("%s (%s:%d)", pkgAndFuncName, filename, line)
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// ErrorCtxKey is the context key to use when storing
|
|
// an error (for use with context.Context).
|
|
const ErrorCtxKey = caddy.CtxKey("handler_chain_error")
|