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nginxadapter.go
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nginxadapter.go
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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 nginxconf
import (
"encoding/json"
"fmt"
"path/filepath"
"strconv"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
caddyconfig.RegisterAdapter("nginx", Adapter{})
}
const ErrUnrecognized = "unrecognized or unsupported nginx directive"
const ErrNamedLocation = "named locations marked by @ are unnsupported"
const ErrExpiresAtTime = "usage of `expires @time` is not supported"
// Adapter adapts NGINX config to Caddy JSON.
type Adapter struct{}
// Adapt converts the NGINX config in body to Caddy JSON.
func (Adapter) Adapt(body []byte, options map[string]interface{}) ([]byte, []caddyconfig.Warning, error) {
filename := "nginx.conf"
if v, ok := options["filename"].(string); ok {
filename = v
filename, _ = filepath.Abs(filename)
}
tokens := tokenize(body, filename)
dirs, err := parse(tokens)
if err != nil {
return nil, nil, fmt.Errorf("parsing: %v", err)
}
ss := setupState{
servers: make(map[string]*caddyhttp.Server),
}
warnings, err := ss.mainContext(dirs)
if err != nil {
return nil, nil, err
}
httpApp := caddyhttp.App{
Servers: ss.servers,
}
ss.mainConfig.AppsRaw = map[string]json.RawMessage{
"http": caddyconfig.JSON(httpApp, &warnings),
}
result, err := json.Marshal(ss.mainConfig)
return result, warnings, err
}
type setupState struct {
mainConfig caddy.Config
servers map[string]*caddyhttp.Server
upstreams map[string]Upstream
}
func (ss *setupState) mainContext(dirs []Directive) ([]caddyconfig.Warning, error) {
var warnings []caddyconfig.Warning
for _, dir := range dirs {
var warns []caddyconfig.Warning
var err error
switch dir.Name() {
case "http":
warns, err = ss.httpContext(dir.Block)
default:
warns = []caddyconfig.Warning{
{
File: dir.File,
Line: dir.Line,
Directive: dir.Name(),
Message: ErrUnrecognized,
},
}
}
warnings = append(warnings, warns...)
if err != nil {
return warnings, err
}
}
return warnings, nil
}
func (ss *setupState) httpContext(dirs []Directive) ([]caddyconfig.Warning, error) {
var warnings []caddyconfig.Warning
for _, dir := range dirs {
var warns []caddyconfig.Warning
var err error
switch dir.Name() {
case "index":
for k, d := range dirs {
if d.Name() == "server" {
dirs[k].Block = append(d.Block, dir)
}
}
case "server":
warns, err = ss.serverContext(dir.Block)
case "upstream":
up, w, err := ss.upstreamContext(dir.Block)
warns = append(warns, w...)
if err != nil {
return warns, err
}
if ss.upstreams == nil {
ss.upstreams = make(map[string]Upstream)
}
ss.upstreams[dir.Param(1)] = up
default:
warns = []caddyconfig.Warning{
{
File: dir.File,
Line: dir.Line,
Directive: dir.Name(),
Message: ErrUnrecognized,
},
}
}
warnings = append(warnings, warns...)
if err != nil {
return warnings, err
}
}
return warnings, nil
}
var nginxToCaddyVars = map[string]string{
"$host:$port": "{http.request.hostport}",
"$hostname:$port": "{http.request.hostport}",
"$host": "{http.request.host}",
"$hostname": "{http.request.host}",
"$server_port": "{http.request.port}",
"$scheme": "{http.request.scheme}",
"$request_uri": "{http.request.uri}",
"$query_string": "{http.request.uri.query_string}",
"$args": "{http.request.uri.query_string}",
"$request_method": "{http.request.method}",
}
func getCaddyVar(nginxVar string) string {
if v, ok := nginxToCaddyVars[nginxVar]; ok {
return v
}
if strings.HasPrefix(nginxVar, "$cookie_") {
return fmt.Sprintf("{http.request.cookie.%s}", strings.TrimPrefix(nginxVar, "$cookie_"))
}
// variables prefixed with `$http_` correspond to respective header field with the suffix name
// Source: https://nginx.org/en/docs/http/ngx_http_core_module.html#var_http_
if strings.HasPrefix(nginxVar, "$http_") {
return fmt.Sprintf("{http.request.header.%s}", strings.TrimPrefix(nginxVar, "$http_"))
}
return fmt.Sprintf("{http.vars.%s}", strings.TrimPrefix(nginxVar, "$"))
}
func encodeMatcherSets(currentMatcherSet []map[string]caddyhttp.RequestMatcher) (caddyhttp.RawMatcherSets, error) {
// encode the matchers then set the result as raw matcher config
var matcherSetsEnc caddyhttp.RawMatcherSets
for _, ms := range currentMatcherSet {
msEncoded := make(map[string]json.RawMessage)
for matcherName, val := range ms {
jsonBytes, err := json.Marshal(val)
if err != nil {
return nil, fmt.Errorf("marshaling matcher set %#v: %v", currentMatcherSet, err)
}
msEncoded[matcherName] = jsonBytes
}
matcherSetsEnc = append(matcherSetsEnc, msEncoded)
}
return matcherSetsEnc, nil
}
func isNumeric(s string) bool {
_, err := strconv.Atoi(s)
return err == nil
}
// Interface guard
var _ caddyconfig.Adapter = (*Adapter)(nil)