mirror of https://github.com/caddyserver/caddy
117 lines
3.3 KiB
Go
117 lines
3.3 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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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
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)
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func init() {
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caddy.RegisterModule(StaticError{})
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}
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// StaticError implements a simple handler that returns an error.
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// This handler returns an error value, but does not write a response.
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// This is useful when you want the server to act as if an error
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// occurred; for example, to invoke your custom error handling logic.
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//
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// Since this handler does not write a response, the error information
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// is for use by the server to know how to handle the error.
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type StaticError struct {
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// The error message. Optional. Default is no error message.
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Error string `json:"error,omitempty"`
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// The recommended HTTP status code. Can be either an integer or a
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// string if placeholders are needed. Optional. Default is 500.
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StatusCode WeakString `json:"status_code,omitempty"`
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}
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// CaddyModule returns the Caddy module information.
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func (StaticError) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.handlers.error",
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New: func() caddy.Module { return new(StaticError) },
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}
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}
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// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
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//
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// error [<matcher>] <status>|<message> [<status>] {
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// message <text>
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// }
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//
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// If there is just one argument (other than the matcher), it is considered
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// to be a status code if it's a valid positive integer of 3 digits.
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func (e *StaticError) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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d.Next() // consume directive name
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args := d.RemainingArgs()
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switch len(args) {
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case 1:
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if len(args[0]) == 3 {
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if num, err := strconv.Atoi(args[0]); err == nil && num > 0 {
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e.StatusCode = WeakString(args[0])
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break
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}
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}
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e.Error = args[0]
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case 2:
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e.Error = args[0]
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e.StatusCode = WeakString(args[1])
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default:
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return d.ArgErr()
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}
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for d.NextBlock(0) {
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switch d.Val() {
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case "message":
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if e.Error != "" {
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return d.Err("message already specified")
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}
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if !d.AllArgs(&e.Error) {
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return d.ArgErr()
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}
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default:
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return d.Errf("unrecognized subdirective '%s'", d.Val())
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}
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}
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return nil
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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 (
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_ MiddlewareHandler = (*StaticError)(nil)
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_ caddyfile.Unmarshaler = (*StaticError)(nil)
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)
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