145 lines
3.9 KiB
Go
145 lines
3.9 KiB
Go
/*
|
|
* mimedb: Mime Database, (C) 2015 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 mimedb is a database of file extension to mime content-type.
|
|
// Definitions are imported from NodeJS mime-db project under MIT license.
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"strings"
|
|
"text/template"
|
|
)
|
|
|
|
const progTempl = `// DO NOT EDIT THIS FILE. IT IS AUTO-GENERATED BY "gen-db.go". //
|
|
/*
|
|
* mimedb: Mime Database, (C) 2016 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 mimedb is a database of file extension to mime content-type.
|
|
// Definitions are imported from NodeJS mime-db project under MIT license.
|
|
package mimedb
|
|
|
|
// DB - Mime is a collection of mime types with extension as key and content-type as value.
|
|
var DB = map[string]struct {
|
|
ContentType string
|
|
Compressible bool
|
|
}{
|
|
{{range $extension, $entry := . }} "{{$extension}}": {
|
|
ContentType: "{{$entry.ContentType}}",
|
|
Compressible: {{$entry.Compressible}},
|
|
},
|
|
{{end}}}
|
|
`
|
|
|
|
type mimeEntry struct {
|
|
ContentType string `json:"contentType"`
|
|
Compressible bool `json:"compresible"`
|
|
}
|
|
|
|
type mimeDB map[string]mimeEntry
|
|
|
|
// JSON data from gobindata and parse them into extDB.
|
|
func convertDB(jsonFile string) (mimeDB, error) {
|
|
// Structure of JSON data from mime-db project.
|
|
type dbEntry struct {
|
|
Source string `json:"source"`
|
|
Compressible bool `json:"compresible"`
|
|
Extensions []string `json:"extensions"`
|
|
}
|
|
|
|
// Access embedded "db.json" inside go-bindata.
|
|
jsonDB, err := ioutil.ReadFile(jsonFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Convert db.json into go's typed structure.
|
|
db := make(map[string]dbEntry)
|
|
if err := json.Unmarshal(jsonDB, &db); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
mDB := make(mimeDB)
|
|
|
|
// Generate a new database from mime-db.
|
|
for key, val := range db {
|
|
if len(val.Extensions) > 0 {
|
|
/* Denormalize - each extension has its own
|
|
unique content-type now. Looks will be fast. */
|
|
for _, ext := range val.Extensions {
|
|
/* Single extension type may map to
|
|
multiple content-types. In that case,
|
|
simply prefer the longest content-type
|
|
to maintain some level of
|
|
consistency. Only guarantee is,
|
|
whatever content type is assigned, it
|
|
is appropriate and valid type. */
|
|
if strings.Compare(mDB[ext].ContentType, key) < 0 {
|
|
mDB[ext] = mimeEntry{
|
|
ContentType: key,
|
|
Compressible: val.Compressible,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return mDB, nil
|
|
}
|
|
|
|
func main() {
|
|
// Take input json file from command-line".
|
|
if len(os.Args) != 2 {
|
|
fmt.Print("Syntax:\n\tgen-db /path/to/db.json\n")
|
|
os.Exit(1)
|
|
}
|
|
|
|
// Load and convert db.json into new database with extension
|
|
// as key.
|
|
mDB, err := convertDB(os.Args[1])
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Generate db embedded go program.
|
|
tmpl := template.New("mimedb")
|
|
mimeTmpl, err := tmpl.Parse(progTempl)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
err = mimeTmpl.Execute(os.Stdout, mDB)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|