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// 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"
"strings"
"github.com/caddyserver/caddy/v2"
)
func init() {
caddy.RegisterModule(caddy.Module{
Name: "http.handlers.error",
New: func() interface{} { return new(StaticError) },
})
}
// StaticError implements a simple handler that returns an error.
type StaticError struct {
Error string `json:"error,omitempty"`
StatusCode weakString `json:"status_code,omitempty"`
}
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)
// weakString is a type that unmarshals any JSON value
// as a string literal, and provides methods for
// getting the value as different primitive types.
// However, using this type removes any type safety
// as far as deserializing JSON is concerned.
type weakString string
// UnmarshalJSON satisfies json.Unmarshaler. It
// unmarshals b by always interpreting it as a
// string literal.
func (ws *weakString) UnmarshalJSON(b []byte) error {
*ws = weakString(strings.Trim(string(b), `"`))
return nil
}
// Int returns ws as an integer. If ws is not an
// integer, 0 is returned.
func (ws weakString) Int() int {
num, _ := strconv.Atoi(string(ws))
return num
}
// Float64 returns ws as a float64. If ws is not a
// float value, the zero value is returned.
func (ws weakString) Float64() float64 {
num, _ := strconv.ParseFloat(string(ws), 64)
return num
}
// Bool returns ws as a boolean. If ws is not a
// boolean, false is returned.
func (ws weakString) Bool() bool {
return string(ws) == "true"
}
// String returns ws as a string.
func (ws weakString) String() string {
return string(ws)
}
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