mirror of https://github.com/minio/minio.git
147 lines
4.2 KiB
Go
147 lines
4.2 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Package mimedb is a database of file extension to mime content-type.
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// Definitions are imported from NodeJS mime-db project under MIT license.
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package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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"text/template"
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)
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const progTempl = `// DO NOT EDIT THIS FILE. IT IS AUTO-GENERATED BY "gen-db.go".
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// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Package mimedb is a database of file extension to mime content-type.
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// Definitions are imported from NodeJS mime-db project under MIT license.
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package mimedb
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// DB - Mime is a collection of mime types with extension as key and content-type as value.
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var DB = map[string]struct {
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ContentType string
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Compressible bool
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}{
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{{range $extension, $entry := . }} "{{$extension}}": {
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ContentType: "{{$entry.ContentType}}",
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Compressible: {{$entry.Compressible}},
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},
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{{end}}}
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`
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type mimeEntry struct {
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ContentType string `json:"contentType"`
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Compressible bool `json:"compresible"`
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}
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type mimeDB map[string]mimeEntry
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// JSON data from gobindata and parse them into extDB.
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func convertDB(jsonFile string) (mimeDB, error) {
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// Structure of JSON data from mime-db project.
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type dbEntry struct {
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Source string `json:"source"`
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Compressible bool `json:"compresible"`
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Extensions []string `json:"extensions"`
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}
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// Access embedded "db.json" inside go-bindata.
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jsonDB, err := ioutil.ReadFile(jsonFile)
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if err != nil {
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return nil, err
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}
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// Convert db.json into go's typed structure.
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db := make(map[string]dbEntry)
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if err := json.Unmarshal(jsonDB, &db); err != nil {
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return nil, err
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}
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mDB := make(mimeDB)
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// Generate a new database from mime-db.
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for key, val := range db {
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if len(val.Extensions) > 0 {
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/* Denormalize - each extension has its own
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unique content-type now. Looks will be fast. */
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for _, ext := range val.Extensions {
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/* Single extension type may map to
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multiple content-types. In that case,
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simply prefer the longest content-type
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to maintain some level of
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consistency. Only guarantee is,
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whatever content type is assigned, it
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is appropriate and valid type. */
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if strings.Compare(mDB[ext].ContentType, key) < 0 {
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mDB[ext] = mimeEntry{
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ContentType: key,
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Compressible: val.Compressible,
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}
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}
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}
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}
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}
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return mDB, nil
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}
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func main() {
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// Take input json file from command-line".
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if len(os.Args) != 2 {
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fmt.Print("Syntax:\n\tgen-db /path/to/db.json\n")
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os.Exit(1)
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}
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// Load and convert db.json into new database with extension
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// as key.
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mDB, err := convertDB(os.Args[1])
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if err != nil {
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panic(err)
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}
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// Generate db embedded go program.
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tmpl := template.New("mimedb")
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mimeTmpl, err := tmpl.Parse(progTempl)
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if err != nil {
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panic(err)
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}
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err = mimeTmpl.Execute(os.Stdout, mDB)
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if err != nil {
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panic(err)
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}
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}
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