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compress.go
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compress.go
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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* 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 compress
import (
"fmt"
"strings"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/pkg/env"
)
// Config represents the compression settings.
type Config struct {
Enabled bool `json:"enabled"`
Extensions []string `json:"extensions"`
MimeTypes []string `json:"mime-types"`
}
// Compression environment variables
const (
Extensions = "extensions"
MimeTypes = "mime_types"
EnvCompressState = "MINIO_COMPRESS_ENABLE"
EnvCompressExtensions = "MINIO_COMPRESS_EXTENSIONS"
EnvCompressMimeTypes = "MINIO_COMPRESS_MIME_TYPES"
// Include-list for compression.
DefaultExtensions = ".txt,.log,.csv,.json,.tar,.xml,.bin"
DefaultMimeTypes = "text/*,application/json,application/xml"
)
// DefaultKVS - default KV config for compression settings
var (
DefaultKVS = config.KVS{
config.KV{
Key: config.Enable,
Value: config.EnableOff,
},
config.KV{
Key: Extensions,
Value: DefaultExtensions,
},
config.KV{
Key: MimeTypes,
Value: DefaultMimeTypes,
},
}
)
// Parses the given compression exclude list `extensions` or `content-types`.
func parseCompressIncludes(include string) ([]string, error) {
includes := strings.Split(include, config.ValueSeparator)
for _, e := range includes {
if len(e) == 0 {
return nil, config.ErrInvalidCompressionIncludesValue(nil).Msg("extension/mime-type cannot be empty")
}
if e == "/" {
return nil, config.ErrInvalidCompressionIncludesValue(nil).Msg("extension/mime-type cannot be '/'")
}
}
return includes, nil
}
// LookupConfig - lookup compression config.
func LookupConfig(kvs config.KVS) (Config, error) {
var err error
cfg := Config{}
if err = config.CheckValidKeys(config.CompressionSubSys, kvs, DefaultKVS); err != nil {
return cfg, err
}
compress := env.Get(EnvCompress, "")
if compress == "" {
compress = env.Get(EnvCompressState, kvs.Get(config.Enable))
}
cfg.Enabled, err = config.ParseBool(compress)
if err != nil {
// Parsing failures happen due to empty KVS, ignore it.
if kvs.Empty() {
return cfg, nil
}
return cfg, err
}
if !cfg.Enabled {
return cfg, nil
}
compressExtensions := env.Get(EnvCompressExtensions, kvs.Get(Extensions))
compressMimeTypes := env.Get(EnvCompressMimeTypes, kvs.Get(MimeTypes))
compressMimeTypesLegacy := env.Get(EnvCompressMimeTypesLegacy, kvs.Get(MimeTypes))
if compressExtensions != "" || compressMimeTypes != "" || compressMimeTypesLegacy != "" {
if compressExtensions != "" {
extensions, err := parseCompressIncludes(compressExtensions)
if err != nil {
return cfg, fmt.Errorf("%s: Invalid MINIO_COMPRESS_EXTENSIONS value (`%s`)", err, extensions)
}
cfg.Extensions = extensions
}
if compressMimeTypes != "" {
mimeTypes, err := parseCompressIncludes(compressMimeTypes)
if err != nil {
return cfg, fmt.Errorf("%s: Invalid MINIO_COMPRESS_MIME_TYPES value (`%s`)", err, mimeTypes)
}
cfg.MimeTypes = mimeTypes
}
if compressMimeTypesLegacy != "" {
mimeTypes, err := parseCompressIncludes(compressMimeTypesLegacy)
if err != nil {
return cfg, fmt.Errorf("%s: Invalid MINIO_COMPRESS_MIME_TYPES value (`%s`)", err, mimeTypes)
}
cfg.MimeTypes = mimeTypes
}
}
return cfg, nil
}