144 lines
3.9 KiB
Go
144 lines
3.9 KiB
Go
/*
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* mimedb: Mime Database, (C) 2015 MinIO, Inc.
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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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*/
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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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/*
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* mimedb: Mime Database, (C) 2016 MinIO, Inc.
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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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*/
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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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