mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-26 02:09:47 +08:00
0d7fe36007
* httpcaddyfile: Add `error` directive for the existing handler * httpcaddyfile: Move `error` to the end of the order
118 lines
3.3 KiB
Go
118 lines
3.3 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 (
|
|
"fmt"
|
|
"net/http"
|
|
"strconv"
|
|
|
|
"github.com/caddyserver/caddy/v2"
|
|
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
|
|
)
|
|
|
|
func init() {
|
|
caddy.RegisterModule(StaticError{})
|
|
}
|
|
|
|
// StaticError implements a simple handler that returns an error.
|
|
// This handler returns an error value, but does not write a response.
|
|
// This is useful when you want the server to act as if an error
|
|
// occurred; for example, to invoke your custom error handling logic.
|
|
//
|
|
// Since this handler does not write a response, the error information
|
|
// is for use by the server to know how to handle the error.
|
|
type StaticError struct {
|
|
// The error message. Optional. Default is no error message.
|
|
Error string `json:"error,omitempty"`
|
|
|
|
// The recommended HTTP status code. Can be either an integer or a
|
|
// string if placeholders are needed. Optional. Default is 500.
|
|
StatusCode WeakString `json:"status_code,omitempty"`
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (StaticError) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.handlers.error",
|
|
New: func() caddy.Module { return new(StaticError) },
|
|
}
|
|
}
|
|
|
|
// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
|
|
//
|
|
// error [<matcher>] <status>|<message> [<status>] {
|
|
// message <text>
|
|
// }
|
|
//
|
|
// If there is just one argument (other than the matcher), it is considered
|
|
// to be a status code if it's a valid positive integer of 3 digits.
|
|
func (e *StaticError) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
args := d.RemainingArgs()
|
|
switch len(args) {
|
|
case 1:
|
|
if len(args[0]) == 3 {
|
|
if num, err := strconv.Atoi(args[0]); err == nil && num > 0 {
|
|
e.StatusCode = WeakString(args[0])
|
|
break
|
|
}
|
|
}
|
|
e.Error = args[0]
|
|
case 2:
|
|
e.Error = args[0]
|
|
e.StatusCode = WeakString(args[1])
|
|
default:
|
|
return d.ArgErr()
|
|
}
|
|
|
|
for d.NextBlock(0) {
|
|
switch d.Val() {
|
|
case "message":
|
|
if e.Error != "" {
|
|
return d.Err("message already specified")
|
|
}
|
|
if !d.AllArgs(&e.Error) {
|
|
return d.ArgErr()
|
|
}
|
|
default:
|
|
return d.Errf("unrecognized subdirective '%s'", d.Val())
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e StaticError) ServeHTTP(w http.ResponseWriter, r *http.Request, _ Handler) error {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
|
|
|
|
statusCode := http.StatusInternalServerError
|
|
if codeStr := e.StatusCode.String(); codeStr != "" {
|
|
intVal, err := strconv.Atoi(repl.ReplaceAll(codeStr, ""))
|
|
if err != nil {
|
|
return Error(http.StatusInternalServerError, err)
|
|
}
|
|
statusCode = intVal
|
|
}
|
|
|
|
return Error(statusCode, fmt.Errorf("%s", e.Error))
|
|
}
|
|
|
|
// Interface guard
|
|
var (
|
|
_ MiddlewareHandler = (*StaticError)(nil)
|
|
_ caddyfile.Unmarshaler = (*StaticError)(nil)
|
|
)
|