/
s3signer.go
98 lines (83 loc) · 1.8 KB
/
s3signer.go
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package main
import (
"errors"
"github.com/gorilla/mux"
"github.com/mitchellh/goamz/aws"
"github.com/mitchellh/goamz/s3"
"io"
"log"
"net/http"
"os"
"time"
)
type S3Client struct {
client *s3.S3
buckets []s3.Bucket
}
func s3init(region aws.Region) S3Client {
auth, err := aws.EnvAuth()
if err != nil {
log.Fatal(err)
}
client := s3.New(auth, region)
buckets, bucketerr := client.ListBuckets()
if bucketerr != nil {
log.Fatal(bucketerr)
}
return S3Client{
client: client,
buckets: buckets.Buckets,
}
}
func (s3 *S3Client) bucketFileHandler(w http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
bucket := vars["bucket"]
filename := vars["filename"]
for i := 0; i < len(s3.buckets); i++ {
if bucket == s3.buckets[i].Name {
keys, err := s3.buckets[i].GetBucketContents()
if err != nil {
log.Fatal("Error listing bucket: ", err)
}
for _, key := range *keys {
if filename == key.Key {
expires := time.Now().UTC()
expires = expires.Add(time.Duration(5) * time.Second)
url := s3.buckets[i].SignedURL(filename, expires)
io.WriteString(w, url)
return
}
}
return
}
}
}
func getRegion() (region aws.Region, err error) {
reqRegion := os.Getenv("AWS_REGION")
if reqRegion == "" {
err = errors.New("missing AWS_REGION environment variable")
return
}
for name, awsRegion := range aws.Regions {
if reqRegion == name {
region = awsRegion
return
}
}
err = errors.New("invalid region: " + reqRegion)
return
}
func main() {
region, err := getRegion()
if err != nil {
log.Fatal(err)
}
s3 := s3init(region)
r := mux.NewRouter()
r.HandleFunc("/{bucket}/{filename}/", s3.bucketFileHandler)
http.Handle("/", r)
httperr := http.ListenAndServe(":8080", nil)
if httperr != nil {
log.Fatal("http error: ", httperr)
}
}