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main.go
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main.go
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package main
import (
"bytes"
"context"
"encoding/json"
"io/ioutil"
"log"
"net/http"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
const vcapServicesVar = "VCAP_SERVICES"
var (
bucket string
svc *s3.S3
ctx = context.Background()
)
func handler(w http.ResponseWriter, r *http.Request) {
key := r.URL.Path[1:]
switch r.Method {
case http.MethodPut, http.MethodPost:
body, readErr := ioutil.ReadAll(r.Body)
if readErr != nil {
w.WriteHeader(http.StatusInternalServerError)
_, writeRespErr := w.Write([]byte(readErr.Error()))
log.Fatal(writeRespErr)
}
resp, s3Err := svc.PutObjectWithContext(ctx, &s3.PutObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
Body: bytes.NewReader(body),
})
if s3Err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, writeRespErr := w.Write([]byte(s3Err.Error()))
if writeRespErr != nil{
log.Fatal(writeRespErr)
}
return
}
_, writeRespErr := w.Write([]byte(resp.String()))
if writeRespErr != nil {
log.Fatal(writeRespErr)
}
case http.MethodGet:
s3Resp, s3Err := svc.GetObjectWithContext(ctx, &s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
})
if s3Err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, writeRespErr := w.Write([]byte(s3Err.Error()))
if writeRespErr != nil {
log.Fatal(writeRespErr)
}
return
}
content, readErr := ioutil.ReadAll(s3Resp.Body)
if readErr != nil {
w.WriteHeader(http.StatusInternalServerError)
_, writeRespErr := w.Write([]byte(readErr.Error()))
if writeRespErr != nil {
log.Fatal(writeRespErr)
}
}
_, writeRespErr := w.Write(content)
if writeRespErr != nil {
log.Fatal(writeRespErr)
}
case http.MethodDelete:
resp, s3Err := svc.DeleteObjectWithContext(ctx, &s3.DeleteObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
})
if s3Err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, writeRespErr := w.Write([]byte(s3Err.Error()))
log.Fatal(writeRespErr)
return
}
_, writeRespErr := w.Write([]byte(resp.String()))
if writeRespErr != nil {
log.Fatal(writeRespErr)
}
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
}
func main() {
vcapServices := os.Getenv(vcapServicesVar)
var services map[string][]map[string]interface{}
err := json.Unmarshal([]byte(vcapServices), &services)
if err != nil {
log.Fatal(err)
}
vcapCredentials := services["ecs-bucket"][0]["credentials"].(map[string]interface{})
if len(services["ecs-bucket"]) == 0 {
log.Fatalf("No bucket bound: %v", vcapServices)
}
endpoint := vcapCredentials["endpoint"].(string)
sess, sessErr := session.NewSession(&aws.Config{
Region: aws.String("us-west-2"),
Credentials: credentials.NewStaticCredentials(
vcapCredentials["accessKey"].(string),
vcapCredentials["secretKey"].(string),
"TOKEN",
),
Endpoint: &endpoint,
})
if sessErr != nil {
log.Fatal(sessErr)
}
forcePathStyle := true
svc = s3.New(sess, &aws.Config{Endpoint: &endpoint, S3ForcePathStyle: &forcePathStyle})
bucket = vcapCredentials["bucket"].(string)
http.HandleFunc("/", handler)
log.Fatal(http.ListenAndServe(":8080", nil))
}