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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 caddyzstd
import (
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/encode"
"github.com/klauspost/compress/zstd"
)
func init() {
caddy.RegisterModule(Zstd{})
}
// Zstd can create Zstandard encoders.
type Zstd struct{}
// CaddyModule returns the Caddy module information.
func (Zstd) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.encoders.zstd",
New: func() caddy.Module { return new(Zstd) },
}
}
// UnmarshalCaddyfile sets up the handler from Caddyfile tokens.
func (z *Zstd) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
return nil
}
// AcceptEncoding returns the name of the encoding as
// used in the Accept-Encoding request headers.
func (Zstd) AcceptEncoding() string { return "zstd" }
// NewEncoder returns a new gzip writer.
func (z Zstd) NewEncoder() encode.Encoder {
// The default of 8MB for the window is
// too large for many clients, so we limit
// it to 128K to lighten their load.
writer, _ := zstd.NewWriter(nil, zstd.WithWindowSize(128<<10), zstd.WithEncoderConcurrency(1), zstd.WithZeroFrames(true))
return writer
}
// Interface guards
var (
_ encode.Encoding = (*Zstd)(nil)
_ caddyfile.Unmarshaler = (*Zstd)(nil)
)
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