mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-16 21:56:40 -05:00
95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyhttp
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import (
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"github.com/caddyserver/caddy/v2"
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)
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func init() {
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caddy.RegisterModule(caddy.Module{
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Name: "http.handlers.error",
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New: func() interface{} { return new(StaticError) },
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})
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}
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// StaticError implements a simple handler that returns an error.
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type StaticError struct {
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Error string `json:"error,omitempty"`
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StatusCode weakString `json:"status_code,omitempty"`
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}
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func (e StaticError) ServeHTTP(w http.ResponseWriter, r *http.Request, _ Handler) error {
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repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)
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statusCode := http.StatusInternalServerError
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if codeStr := e.StatusCode.String(); codeStr != "" {
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intVal, err := strconv.Atoi(repl.ReplaceAll(codeStr, ""))
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if err != nil {
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return Error(http.StatusInternalServerError, err)
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}
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statusCode = intVal
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}
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return Error(statusCode, fmt.Errorf("%s", e.Error))
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}
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// Interface guard
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var _ MiddlewareHandler = (*StaticError)(nil)
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// weakString is a type that unmarshals any JSON value
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// as a string literal, and provides methods for
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// getting the value as different primitive types.
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// However, using this type removes any type safety
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// as far as deserializing JSON is concerned.
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type weakString string
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// UnmarshalJSON satisfies json.Unmarshaler. It
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// unmarshals b by always interpreting it as a
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// string literal.
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func (ws *weakString) UnmarshalJSON(b []byte) error {
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*ws = weakString(strings.Trim(string(b), `"`))
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return nil
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}
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// Int returns ws as an integer. If ws is not an
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// integer, 0 is returned.
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func (ws weakString) Int() int {
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num, _ := strconv.Atoi(string(ws))
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return num
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}
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// Float64 returns ws as a float64. If ws is not a
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// float value, the zero value is returned.
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func (ws weakString) Float64() float64 {
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num, _ := strconv.ParseFloat(string(ws), 64)
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return num
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}
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// Bool returns ws as a boolean. If ws is not a
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// boolean, false is returned.
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func (ws weakString) Bool() bool {
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return string(ws) == "true"
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}
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// String returns ws as a string.
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func (ws weakString) String() string {
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return string(ws)
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}
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