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main.go
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main.go
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// Command docsync uploads a local directory to a specified
// S3 bucket
//
// Usage:
//
// docsync bucket bucketPrefix localDir
//
// where bucket is the name of your S3 bucket, bucketPrefix is the
// S3 prefix to be applied to all uploaded files, and localDir is a
// directory containing compiled docs (from docgenerate) or other
// files to upload.
package main
import (
"bytes"
"io/ioutil"
"log"
"mime"
"os"
"path"
"path/filepath"
"sort"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
func main() {
bucket := os.Args[1]
bucketPrefix := strings.TrimSuffix(os.Args[2], "/") + "/"
localDir := os.Args[3]
localKeys := mustListContents(localDir)
region := "us-east-1"
sess := session.Must(session.NewSession(aws.NewConfig().WithRegion(region)))
svc := s3.New(sess)
var remoteKeys []string
err := svc.ListObjectsPages(&s3.ListObjectsInput{
Bucket: aws.String(bucket),
Prefix: aws.String(bucketPrefix),
}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
for _, obj := range page.Contents {
if !(*obj.Key == bucketPrefix) {
remoteKeys = append(remoteKeys, *obj.Key)
}
}
return true
})
if err != nil {
log.Fatalln("s3 list objects error:", err)
}
for _, k := range localKeys {
var body []byte
path := path.Join(localDir, k)
body, err = ioutil.ReadFile(path)
if err != nil {
log.Fatalln(err.Error())
}
upload := &s3.PutObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(bucketPrefix + k),
Body: bytes.NewReader(body),
}
ext := filepath.Ext(path)
contentType := mime.TypeByExtension(ext)
if contentType == "" {
upload.SetContentType("text/html")
} else {
upload.SetContentType(contentType)
}
_, err = svc.PutObject(upload)
if err != nil {
log.Fatalln(err.Error())
}
}
var prefixedLocalKeys []string
for _, k := range localKeys {
prefixedLocalKeys = append(prefixedLocalKeys, bucketPrefix+k)
}
remoteOnly := setDiff(remoteKeys, prefixedLocalKeys)
for _, k := range remoteOnly {
remove := &s3.DeleteObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(k),
}
_, err = svc.DeleteObject(remove)
if err != nil {
log.Fatalln(err.Error())
}
}
}
func setDiff(a, b []string) []string {
// don't modify input
a = append([]string{}, a...)
b = append([]string{}, b...)
sort.Strings(a)
sort.Strings(b)
var (
diff []string
i, j int
)
for {
if i == len(a) {
break
}
if j == len(b) {
diff = append(diff, a[i:]...)
break
}
if a[i] < b[j] {
diff = append(diff, a[i])
i++
} else if b[j] < a[i] {
j++
} else { // a[i] == b[j]
i++
j++
}
}
return diff
}
func mustListContents(parentPath string) []string {
files, err := ioutil.ReadDir(parentPath)
if err != nil {
log.Fatalln("ReadDir error:", err)
}
var res []string
for _, f := range files {
n := f.Name()
if strings.HasPrefix(n, ".") {
continue
}
if f.IsDir() {
descendants := mustListContents(path.Join(parentPath, n))
for _, d := range descendants {
res = append(res, path.Join(n, d))
}
} else {
res = append(res, n)
}
}
return res
}