Merge pull request #124 from rebuy-de/add-cdnmirror

add cdnmirror

cmd/cdnmirror/main.go

@@ -0,0 +1,116 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/evanw/esbuild/pkg/api"
+	"github.com/pkg/errors"
+	"github.com/rebuy-de/rebuy-go-sdk/v4/pkg/cmdutil"
+	"github.com/rebuy-de/rebuy-go-sdk/v4/pkg/webutil"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+const targetPathPrefix = `assets/cdnmirror`
+
+func main() {
+	defer cmdutil.HandleExit()
+	if err := NewRootCommand().Execute(); err != nil {
+		logrus.Fatal(err)
+	}
+}
+
+func NewRootCommand() *cobra.Command {
+	return cmdutil.New(
+		"cdnmirror SOURCE_NAME..", "Downloads assets from CDNs so the server can serve them directly.",
+		cmdutil.WithLogVerboseFlag(),
+		cmdutil.WithRun(Generate),
+	)
+}
+
+func Generate(ctx context.Context, cmd *cobra.Command, args []string) {
+	err := os.MkdirAll(targetPathPrefix, 0755)
+	cmdutil.Must(err)
+
+	writeGitignore()
+
+	for _, name := range args {
+		source := resolve(name)
+		download(source)
+	}
+}
+
+func writeGitignore() {
+	filename := path.Join(targetPathPrefix, ".gitignore")
+
+	buf := new(bytes.Buffer)
+	fmt.Fprintln(buf, "*")
+	fmt.Fprintln(buf, "!.gitignore")
+
+	err := ioutil.WriteFile(filename, buf.Bytes(), 0644)
+	cmdutil.Must(err)
+}
+
+func resolve(name string) webutil.CDNMirrorSource {
+	switch name {
+	case "@hotwired/turbo":
+		return webutil.CDNMirrorSourceHotwiredTurbo()
+	case "bootstrap":
+		return webutil.CDNMirrorSourceBootstrap()
+	case "font-awesome-sprites":
+		return webutil.CDNMirrorSourceFontAwesomeSprites()
+	case "bulma":
+		return webutil.CDNMirrorSourceBulma()
+	default:
+		cmdutil.Must(errors.Errorf("invalid source name"))
+		return webutil.CDNMirrorSource{}
+	}
+}
+
+func download(source webutil.CDNMirrorSource) {
+	targetFile := filepath.FromSlash(path.Join(targetPathPrefix, source.Target))
+
+	resp, err := http.Get(source.URL)
+	cmdutil.Must(err)
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		cmdutil.Must(fmt.Errorf(resp.Status))
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	cmdutil.Must(err)
+
+	var code string
+
+	switch source.Minify {
+	case webutil.CDNMirrorMinifyJS:
+		result := api.Transform(string(body), api.TransformOptions{
+			MinifyWhitespace:  true,
+			MinifyIdentifiers: true,
+			MinifySyntax:      true,
+		})
+		if len(result.Errors) != 0 {
+			cmdutil.Must(errors.Errorf("%#v", result.Errors))
+		}
+		code = string(result.Code)
+
+	default:
+		code = string(body)
+	}
+
+	f, err := os.Create(targetFile)
+	cmdutil.Must(err)
+	defer f.Close()
+
+	_, err = io.WriteString(f, code)
+	cmdutil.Must(err)
+}

go.mod

@@ -70,6 +70,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/emirpasic/gods v1.12.0 // indirect
+	github.com/evanw/esbuild v0.15.9 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/go-git/go-billy/v5 v5.3.1 // indirect

go.sum

@@ -183,6 +183,8 @@ github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.m
 github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.mod h1:AFq3mo9L8Lqqiid3OhADV3RfLJnjiw63cSpi+fDTRC0=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanphx/json-patch v4.12.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
+github.com/evanw/esbuild v0.15.9 h1:1mjUDJqaSdVZJa6HXD5tyKDNZ2fym9lULLg+Ar2Nqzs=
+github.com/evanw/esbuild v0.15.9/go.mod h1:iINY06rn799hi48UqEnaQvVfZWe6W9bET78LbvN8VWk=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=

pkg/webutil/cdnmirror.go

@@ -0,0 +1,43 @@
+package webutil
+
+type CDNMirrorSource struct {
+	URL    string
+	Target string
+	Minify CDNMirrorMinifier
+}
+
+type CDNMirrorMinifier string
+
+const (
+	CDNMirrorMinifyJS  = "js"
+	CDNMirrorMinifyCSS = "css"
+)
+
+func CDNMirrorSourceHotwiredTurbo() CDNMirrorSource {
+	return CDNMirrorSource{
+		URL:    "https://unpkg.com/@hotwired/[email protected]/dist/turbo.es2017-umd.js",
+		Target: "hotwired-turbo-7.1.0-min.js",
+		Minify: CDNMirrorMinifyJS,
+	}
+}
+
+func CDNMirrorSourceBootstrap() CDNMirrorSource {
+	return CDNMirrorSource{
+		URL:    "https://unpkg.com/[email protected]/dist/css/bootstrap.min.css",
+		Target: "bootstrap-5.1.3-min.css",
+	}
+}
+
+func CDNMirrorSourceFontAwesomeSprites() CDNMirrorSource {
+	return CDNMirrorSource{
+		URL:    "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.2/sprites/solid.svg",
+		Target: "font-awesome-6.1.2-sprites-solid.svg",
+	}
+}
+
+func CDNMirrorSourceBulma() CDNMirrorSource {
+	return CDNMirrorSource{
+		URL:    "https://cdn.jsdelivr.net/npm/[email protected]/css/bulma.min.css",
+		Target: "bulma-0.7.4.min.css",
+	}
+}