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https://github.com/caddyserver/caddy.git
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c9980fd367
Use piles from which to draw config values. Module values can return their name, so now we can do two-way mapping from value to name and name to value; whereas before we could only map name to value. This was problematic with the Caddyfile adapter since it receives values and needs to know the name to put in the config.
123 lines
3.1 KiB
Go
123 lines
3.1 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(StaticResponse{})
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// TODO: Caddyfile directive
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}
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// StaticResponse implements a simple responder for static responses.
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type StaticResponse struct {
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StatusCode WeakString `json:"status_code,omitempty"`
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Headers http.Header `json:"headers,omitempty"`
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Body string `json:"body,omitempty"`
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Close bool `json:"close,omitempty"`
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}
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// CaddyModule returns the Caddy module information.
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func (StaticResponse) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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Name: "http.handlers.static_response",
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New: func() caddy.Module { return new(StaticResponse) },
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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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// static_response [<matcher>] <status> {
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// body <text>
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// close
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// }
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//
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func (s *StaticResponse) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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for d.Next() {
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var statusCodeStr string
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if d.Args(&statusCodeStr) {
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s.StatusCode = WeakString(statusCodeStr)
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}
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for d.NextBlock() {
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switch d.Val() {
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case "body":
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if s.Body != "" {
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return d.Err("body already specified")
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}
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if !d.Args(&s.Body) {
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return d.ArgErr()
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}
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case "close":
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if s.Close {
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return d.Err("close already specified")
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}
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s.Close = true
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}
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}
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}
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return nil
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}
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func (s StaticResponse) 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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// close the connection after responding
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r.Close = s.Close
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// set all headers
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for field, vals := range s.Headers {
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field = repl.ReplaceAll(field, "")
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newVals := make([]string, len(vals))
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for i := range vals {
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newVals[i] = repl.ReplaceAll(vals[i], "")
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}
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w.Header()[field] = newVals
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}
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// do not allow Go to sniff the content-type
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if w.Header().Get("Content-Type") == "" {
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w.Header()["Content-Type"] = nil
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}
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// get the status code
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statusCode := http.StatusOK
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if codeStr := s.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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// write headers
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w.WriteHeader(statusCode)
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// write response body
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if s.Body != "" {
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fmt.Fprint(w, repl.ReplaceAll(s.Body, ""))
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}
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return nil
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}
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// Interface guard
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var _ MiddlewareHandler = (*StaticResponse)(nil)
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