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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 encode
import (
"net/http"
"strconv"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("encode", parseCaddyfile)
}
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
enc := new(Encode)
err := enc.UnmarshalCaddyfile(h.Dispenser)
if err != nil {
return nil, err
}
return enc, nil
}
// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
//
// encode [<matcher>] <formats...> {
// gzip [<level>]
// zstd
// minimum_length <length>
// prefer <formats...>
// # response matcher block
// match {
// status <code...>
// header <field> [<value>]
// }
// # or response matcher single line syntax
// match [header <field> [<value>]] | [status <code...>]
// }
//
// Specifying the formats on the first line will use those formats' defaults.
func (enc *Encode) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
responseMatchers := make(map[string]caddyhttp.ResponseMatcher)
for d.Next() {
for _, arg := range d.RemainingArgs() {
mod, err := caddy.GetModule("http.encoders." + arg)
if err != nil {
return d.Errf("finding encoder module '%s': %v", mod, err)
}
encoding, ok := mod.New().(Encoding)
if !ok {
return d.Errf("module %s is not an HTTP encoding", mod)
}
if enc.EncodingsRaw == nil {
enc.EncodingsRaw = make(caddy.ModuleMap)
}
enc.EncodingsRaw[arg] = caddyconfig.JSON(encoding, nil)
}
for d.NextBlock(0) {
switch d.Val() {
case "minimum_length":
if !d.NextArg() {
return d.ArgErr()
}
minLength, err := strconv.Atoi(d.Val())
if err != nil {
return err
}
enc.MinLength = minLength
case "prefer":
var encs []string
for d.NextArg() {
encs = append(encs, d.Val())
}
if len(encs) == 0 {
return d.ArgErr()
}
enc.Prefer = encs
case "match":
err := enc.parseNamedResponseMatcher(d.NewFromNextSegment(), responseMatchers)
if err != nil {
return err
}
matcher := responseMatchers["match"]
enc.Matcher = &matcher
default:
name := d.Val()
modID := "http.encoders." + name
unm, err := caddyfile.UnmarshalModule(d, modID)
if err != nil {
return err
}
encoding, ok := unm.(Encoding)
if !ok {
return d.Errf("module %s is not an HTTP encoding; is %T", modID, unm)
}
if enc.EncodingsRaw == nil {
enc.EncodingsRaw = make(caddy.ModuleMap)
}
enc.EncodingsRaw[name] = caddyconfig.JSON(encoding, nil)
}
}
}
return nil
}
// Parse the tokens of a named response matcher.
//
// match {
// header <field> [<value>]
// status <code...>
// }
//
// Or, single line syntax:
//
// match [header <field> [<value>]] | [status <code...>]
//
func (enc *Encode) parseNamedResponseMatcher(d *caddyfile.Dispenser, matchers map[string]caddyhttp.ResponseMatcher) error {
for d.Next() {
definitionName := d.Val()
if _, ok := matchers[definitionName]; ok {
return d.Errf("matcher is defined more than once: %s", definitionName)
}
matcher := caddyhttp.ResponseMatcher{}
for nesting := d.Nesting(); d.NextArg() || d.NextBlock(nesting); {
switch d.Val() {
case "header":
if matcher.Headers == nil {
matcher.Headers = http.Header{}
}
// reuse the header request matcher's unmarshaler
headerMatcher := caddyhttp.MatchHeader(matcher.Headers)
err := headerMatcher.UnmarshalCaddyfile(d.NewFromNextSegment())
if err != nil {
return err
}
matcher.Headers = http.Header(headerMatcher)
case "status":
if matcher.StatusCode == nil {
matcher.StatusCode = []int{}
}
args := d.RemainingArgs()
if len(args) == 0 {
return d.ArgErr()
}
for _, arg := range args {
if len(arg) == 3 && strings.HasSuffix(arg, "xx") {
arg = arg[:1]
}
statusNum, err := strconv.Atoi(arg)
if err != nil {
return d.Errf("bad status value '%s': %v", arg, err)
}
matcher.StatusCode = append(matcher.StatusCode, statusNum)
}
default:
return d.Errf("unrecognized response matcher %s", d.Val())
}
}
matchers[definitionName] = matcher
}
return nil
}
// Interface guard
var _ caddyfile.Unmarshaler = (*Encode)(nil)
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