mirror of
https://github.com/caddyserver/caddy.git
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76 lines
2.1 KiB
Go
76 lines
2.1 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 caddygzip
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import (
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"compress/flate"
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"compress/gzip" // TODO: consider using https://github.com/klauspost/compress/gzip
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"fmt"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/encode"
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)
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func init() {
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caddy.RegisterModule(caddy.Module{
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Name: "http.encoders.gzip",
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New: func() interface{} { return new(Gzip) },
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})
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}
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// Gzip can create gzip encoders.
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type Gzip struct {
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Level int `json:"level,omitempty"`
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}
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// Provision provisions g's configuration.
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func (g *Gzip) Provision(ctx caddy.Context) error {
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if g.Level == 0 {
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g.Level = defaultGzipLevel
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}
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return nil
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}
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// Validate validates g's configuration.
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func (g Gzip) Validate() error {
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if g.Level < flate.NoCompression {
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return fmt.Errorf("quality too low; must be >= %d", flate.NoCompression)
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}
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if g.Level > flate.BestCompression {
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return fmt.Errorf("quality too high; must be <= %d", flate.BestCompression)
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}
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return nil
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}
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// AcceptEncoding returns the name of the encoding as
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// used in the Accept-Encoding request headers.
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func (Gzip) AcceptEncoding() string { return "gzip" }
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// NewEncoder returns a new gzip writer.
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func (g Gzip) NewEncoder() encode.Encoder {
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writer, _ := gzip.NewWriterLevel(nil, g.Level)
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return writer
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}
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// Informed from http://blog.klauspost.com/gzip-performance-for-go-webservers/
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var defaultGzipLevel = 5
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// Interface guards
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var (
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_ encode.Encoding = (*Gzip)(nil)
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_ caddy.Provisioner = (*Gzip)(nil)
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_ caddy.Validator = (*Gzip)(nil)
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)
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