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cmd/swarm/mimegen, swarm/api, swarm/api/http, Makefile: Mimegen gener…
…ator added, based on mailcap mime.types file (ethersphere#527, ethersphere#944)
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// Copyright 2018 The go-ethereum Authors | ||
// This file is part of go-ethereum. | ||
// | ||
// go-ethereum is free software: you can redistribute it and/or modify | ||
// it under the terms of the GNU General Public License as published by | ||
// the Free Software Foundation, either version 3 of the License, or | ||
// (at your option) any later version. | ||
// | ||
// go-ethereum is distributed in the hope that it will be useful, | ||
// but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
// GNU General Public License for more details. | ||
// | ||
// You should have received a copy of the GNU General Public License | ||
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>. | ||
package main | ||
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// Standard "mime" package rely on system-settings, see mime.osInitMime | ||
// Swarm will run on many OS/Platform/Docker and must behave similar | ||
// This command generates code to add common mime types based on mime.types file | ||
// | ||
// mime.types file provided by mailcap, which follow https://www.iana.org/assignments/media-types/media-types.xhtml | ||
// | ||
// Get last version of mime.types file by: | ||
// docker run --rm -v $(pwd):/tmp alpine:edge /bin/sh -c "apk add -U mailcap; mv /etc/mime.types /tmp" | ||
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import ( | ||
"bufio" | ||
"bytes" | ||
"flag" | ||
"html/template" | ||
"io/ioutil" | ||
"strings" | ||
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"log" | ||
) | ||
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var ( | ||
typesFlag = flag.String("types", "", "Input mime.types file") | ||
packageFlag = flag.String("package", "", "Golang package in output file") | ||
outFlag = flag.String("out", "", "Output file name for the generated mime types") | ||
) | ||
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type mime struct { | ||
Name string | ||
Exts []string | ||
} | ||
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type templateParams struct { | ||
PackageName string | ||
Mimes []mime | ||
} | ||
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func main() { | ||
// Parse and ensure all needed inputs are specified | ||
flag.Parse() | ||
if *typesFlag == "" { | ||
log.Fatalf("--types is required") | ||
} | ||
if *packageFlag == "" { | ||
log.Fatalf("--types is required") | ||
} | ||
if *outFlag == "" { | ||
log.Fatalf("--out is required") | ||
} | ||
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params := templateParams{ | ||
PackageName: *packageFlag, | ||
} | ||
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types, err := ioutil.ReadFile(*typesFlag) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
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scanner := bufio.NewScanner(bytes.NewReader(types)) | ||
for scanner.Scan() { | ||
txt := scanner.Text() | ||
if strings.HasPrefix(txt, "#") || len(txt) == 0 { | ||
continue | ||
} | ||
parts := strings.Fields(txt) | ||
if len(parts) == 1 { | ||
continue | ||
} | ||
params.Mimes = append(params.Mimes, mime{parts[0], parts[1:]}) | ||
} | ||
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if err = scanner.Err(); err != nil { | ||
log.Fatal(err) | ||
} | ||
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result := bytes.NewBuffer([]byte{}) | ||
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if err := template.Must(template.New("_").Parse(tpl)).Execute(result, params); err != nil { | ||
log.Fatal(err) | ||
} | ||
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if err := ioutil.WriteFile(*outFlag, result.Bytes(), 0600); err != nil { | ||
log.Fatal(err) | ||
} | ||
} | ||
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var tpl = `// Code generated by github.com/ethereum/go-ethereum/cmd/swarm/mimegen. DO NOT EDIT. | ||
package {{ .PackageName }} | ||
import "mime" | ||
func init() { | ||
var mimeTypes = map[string]string{ | ||
{{- range .Mimes -}} | ||
{{ $name := .Name -}} | ||
{{- range .Exts }} | ||
".{{ . }}": "{{ $name | html }}", | ||
{{- end }} | ||
{{- end }} | ||
} | ||
for ext, name := range mimeTypes { | ||
if err := mime.AddExtensionType(ext, name); err != nil { | ||
panic(err) | ||
} | ||
} | ||
} | ||
` |
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