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main.go
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main.go
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package main
import (
"bytes"
"crypto/md5"
"encoding/csv"
"encoding/hex"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"mime"
"os"
"path"
"path/filepath"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
)
// VERSION is the current version
const VERSION = "0.4.0"
var defaultS3Bucket = "static.buffer.com"
var uploader *s3manager.Uploader
var svc *s3.S3
func fatal(format string, a ...interface{}) {
s := "Error: " + format + "\n"
if a != nil {
fmt.Printf(s, a)
} else {
fmt.Print(s)
}
os.Exit(1)
}
// GetFileMd5 returns a checksum for a given file
func GetFileMd5(file io.Reader) (string, error) {
var fileHash string
hash := md5.New()
if _, err := io.Copy(hash, file); err != nil {
return fileHash, err
}
hashInBytes := hash.Sum(nil)[:16]
fileHash = hex.EncodeToString(hashInBytes)
return fileHash, nil
}
// GetVersionedFilename returns a new filename with the version before the extension
func GetVersionedFilename(filename string, version string) string {
ext := filepath.Ext(filename)
versionedExt := "." + version + ext
versionedFilename := strings.Replace(filename, ext, versionedExt, 1)
return versionedFilename
}
// GetFileMimeType returns the mime type of a file using it's extension
func GetFileMimeType(filename string) string {
ext := filepath.Ext(filename)
return mime.TypeByExtension(ext)
}
// GetFilesFromGlobsList returns a list of files that match a list of
// comma-deliniated file path globs
func GetFilesFromGlobsList(globList string) ([]string, error) {
var files []string
globs := strings.Split(globList, ",")
for _, glob := range globs {
fileList, err := filepath.Glob(glob)
if err != nil {
return files, err
}
files = append(files, fileList...)
}
return files, nil
}
// SetupS3Uploader configures and assigns the global "uploader" and "svc" variables
func SetupS3Uploader() {
awsAccessKeyID := os.Getenv("AWS_ACCESS_KEY_ID")
awsSecretAccessKey := os.Getenv("AWS_SECRET_ACCESS_KEY")
creds := credentials.NewStaticCredentials(awsAccessKeyID, awsSecretAccessKey, "")
sess := session.Must(session.NewSession(&aws.Config{
Credentials: creds,
Region: aws.String(endpoints.UsEast1RegionID),
}))
_, err := creds.Get()
if err != nil {
fatal("failed to load AWS credentials %s", err)
}
uploader = s3manager.NewUploader(sess)
svc = s3.New(sess)
}
// HasPreviousUpload performs a HEAD request to check if a file has been uploaded already
func HasPreviousUpload(svc *s3.S3, bucket string, filename string) bool {
req, _ := svc.HeadObjectRequest(&s3.HeadObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(filename),
})
err := req.Send()
if err == nil {
return true
}
return false
}
// GetFileURL returns the final url of the file
func GetFileURL(bucket string, bucketFilename string) string {
// the static.buffer.com bucket has a domain alias
if bucket == defaultS3Bucket {
return "https://" + path.Join(bucket, bucketFilename)
}
return "https://s3.amazonaws.com" + path.Join("/", bucket, "/", bucketFilename)
}
// UploadFile uploads a given file to the s3 bucket
func UploadFile(file *os.File, filename string, bucket string) (err error) {
mimeType := GetFileMimeType(filename)
_, err = uploader.Upload(&s3manager.UploadInput{
Bucket: aws.String(bucket),
Key: aws.String(filename),
ContentType: aws.String(mimeType),
CacheControl: aws.String("public, max-age=31520626"),
Expires: aws.Time(time.Now().AddDate(10, 0, 0)),
Body: file,
})
if err != nil {
return err
}
return nil
}
func ShouldVersionFile(filename string) bool {
ext := filepath.Ext(filename)
return ext == ".js" || ext == ".css"
}
func GetUploadFilename(file io.Reader, filename string, skipVersioning bool) (string, error) {
uploadFilename := filename
if !skipVersioning && ShouldVersionFile(filename) {
checksum, errMd5 := GetFileMd5(file)
if errMd5 != nil {
return "", errMd5
}
uploadFilename = GetVersionedFilename(filename, checksum)
}
return uploadFilename, nil
}
func IsDirectory(path string) (bool, error) {
info, err := os.Stat(path)
if err != nil {
return false, err
}
return info.IsDir(), err
}
// VersionAndUploadFiles will verion files and upload them to s3 and return
// a map of filenames and their version hashes
func VersionAndUploadFiles(
bucket string,
directory string,
filenames []string,
dryRun bool,
skipVersioning bool,
) (map[string]string, error) {
fileVersions := map[string]string{}
fmt.Printf("Uploading to %s/%s\n", bucket, directory)
for _, filename := range filenames {
isDir, err := IsDirectory(filename)
if isDir || err != nil {
continue
}
file, err := os.Open(filename)
if err != nil {
return fileVersions, err
}
uploadFilename, err := GetUploadFilename(file, filename, skipVersioning)
if err != nil {
return fileVersions, err
}
bucketFilename := path.Join(directory, uploadFilename)
fileURL := GetFileURL(bucket, bucketFilename)
shouldUpload := !HasPreviousUpload(svc, bucket, bucketFilename)
if shouldUpload && !dryRun {
err := UploadFile(file, bucketFilename, bucket)
if err != nil {
return fileVersions, err
}
}
if shouldUpload {
fmt.Printf("%-10s %s\n", "Uploaded", filename)
} else {
fmt.Printf("%-10s %s\n", "Skipped", filename)
}
fileVersions[filename] = fileURL
file.Close()
}
return fileVersions, nil
}
// FormatManifest returns the file version manifest in json or csv format
func FormatManifest(fileVersions map[string]string, format string) ([]byte, error) {
if format == "json" {
return json.MarshalIndent(fileVersions, "", " ")
}
if format == "csv" {
b := &bytes.Buffer{}
wr := csv.NewWriter(b)
for filename, uri := range fileVersions {
row := []string{filename, uri}
wr.Write(row)
}
wr.Flush()
return b.Bytes(), nil
}
return nil, nil
}
func main() {
s3Bucket := flag.String("bucket", defaultS3Bucket, "the s3 bucket to upload to")
directory := flag.String("dir", "", "required, the directory to upload files to in the bucket")
filesArg := flag.String("files", "", "the path to the files you'd like to upload, ex. \"public/**/.*js,public/style.css\"")
outputFilename := flag.String("o", "staticAssets.json", "the filename for the versions manifest")
format := flag.String("format", "json", "format of the output [json,csv]")
dryRun := flag.Bool("dry-run", false, "print the output only, skip file uploads and manifest creation")
printVersion := flag.Bool("v", false, "print the current buffer-static-upload version")
skipVersioning := flag.Bool("skip-versioning", false, "skip versioning uploaded files")
flag.Parse()
if *printVersion {
fmt.Printf("%s\n", VERSION)
os.Exit(0)
}
if *directory == "" && *s3Bucket == defaultS3Bucket {
fatal("To use the default bucket you need to specify an upload directory (-dir)")
}
start := time.Now()
files, err := GetFilesFromGlobsList(*filesArg)
if err != nil {
fatal("failed to get files %s", err)
}
append := " and version"
if *skipVersioning == true {
append = ""
}
fmt.Printf("Found %d files to upload%s:\n", len(files), append)
SetupS3Uploader()
fileVersions, err := VersionAndUploadFiles(*s3Bucket, *directory, files, *dryRun, *skipVersioning)
if err != nil {
fatal("failed to upload files %s", err)
}
output, err := FormatManifest(fileVersions, *format)
if err != nil {
fatal("failed to format versions manifest file %s", err)
}
if !*dryRun {
err = ioutil.WriteFile(*outputFilename, output, 0644)
if err != nil {
fatal("failed to write versions mainifest file %s", err)
}
}
elapsed := time.Since(start)
if *dryRun {
fmt.Printf("\nCompleted dry run in %s\n", elapsed)
} else {
fmt.Printf(
"\nSuccessfully uploaded static assets and generated %s in %s\n",
*outputFilename,
elapsed,
)
}
}