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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"
"net/http"
"net/textproto"
"path"
"strconv"
"strings"
"github.com/caddyserver/caddy/v2"
)
func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.ResponseWriter) {
httpVars := func(key string) (string, bool) {
if req != nil {
// query string parameters
if strings.HasPrefix(key, queryReplPrefix) {
vals := req.URL.Query()[key[len(queryReplPrefix):]]
// always return true, since the query param might
// be present only in some requests
return strings.Join(vals, ","), true
}
// request header fields
if strings.HasPrefix(key, reqHeaderReplPrefix) {
field := key[len(reqHeaderReplPrefix):]
vals := req.Header[textproto.CanonicalMIMEHeaderKey(field)]
// always return true, since the header field might
// be present only in some requests
return strings.Join(vals, ","), true
}
// cookies
if strings.HasPrefix(key, cookieReplPrefix) {
name := key[len(cookieReplPrefix):]
for _, cookie := range req.Cookies() {
if strings.EqualFold(name, cookie.Name) {
// always return true, since the cookie might
// be present only in some requests
return cookie.Value, true
}
}
}
switch key {
case "http.request.host":
host, _, err := net.SplitHostPort(req.Host)
if err != nil {
return req.Host, true // OK; there probably was no port
}
return host, true
case "http.request.hostport":
return req.Host, true
case "http.request.method":
return req.Method, true
case "http.request.port":
_, port, _ := net.SplitHostPort(req.Host)
return port, true
case "http.request.scheme":
if req.TLS != nil {
return "https", true
}
return "http", true
case "http.request.uri":
return req.URL.RequestURI(), true
case "http.request.uri.path":
return req.URL.Path, true
case "http.request.uri.path.file":
_, file := path.Split(req.URL.Path)
return file, true
case "http.request.uri.path.dir":
dir, _ := path.Split(req.URL.Path)
return dir, true
case "http.request.uri.query":
return req.URL.RawQuery, true
}
// hostname labels
if strings.HasPrefix(key, hostLabelReplPrefix) {
idxStr := key[len(hostLabelReplPrefix):]
idx, err := strconv.Atoi(idxStr)
if err != nil {
return "", false
}
hostLabels := strings.Split(req.Host, ".")
if idx < 0 {
return "", false
}
if idx >= len(hostLabels) {
return "", true
}
return hostLabels[idx], true
}
// path parts
if strings.HasPrefix(key, pathPartsReplPrefix) {
idxStr := key[len(pathPartsReplPrefix):]
idx, err := strconv.Atoi(idxStr)
if err != nil {
return "", false
}
pathParts := strings.Split(req.URL.Path, "/")
if len(pathParts) > 0 && pathParts[0] == "" {
pathParts = pathParts[1:]
}
if idx < 0 {
return "", false
}
if idx >= len(pathParts) {
return "", true
}
return pathParts[idx], true
}
// middleware variables
if strings.HasPrefix(key, varsReplPrefix) {
varName := key[len(varsReplPrefix):]
tbl := req.Context().Value(VarCtxKey).(map[string]interface{})
raw, ok := tbl[varName]
if !ok {
// variables can be dynamic, so always return true
// even when it may not be set; treat as empty
return "", true
}
// do our best to convert it to a string efficiently
switch val := raw.(type) {
case string:
return val, true
case fmt.Stringer:
return val.String(), true
default:
return fmt.Sprintf("%s", val), true
}
}
}
if w != nil {
// response header fields
if strings.HasPrefix(key, respHeaderReplPrefix) {
field := key[len(respHeaderReplPrefix):]
vals := w.Header()[textproto.CanonicalMIMEHeaderKey(field)]
// always return true, since the header field might
// be present only in some responses
return strings.Join(vals, ","), true
}
}
return "", false
}
repl.Map(httpVars)
}
const (
queryReplPrefix = "http.request.uri.query."
reqHeaderReplPrefix = "http.request.header."
cookieReplPrefix = "http.request.cookie."
hostLabelReplPrefix = "http.request.host.labels."
pathPartsReplPrefix = "http.request.uri.path."
varsReplPrefix = "http.var."
respHeaderReplPrefix = "http.response.header."
)
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