forked from keybase/client
/
s3.go
163 lines (149 loc) · 4.29 KB
/
s3.go
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package main
import (
"bytes"
"compress/gzip"
"crypto/hmac"
"crypto/rand"
"crypto/sha256"
"encoding/base32"
"encoding/hex"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strings"
"time"
)
func gzipSource(src io.Reader) ([]byte, error) {
buf := new(bytes.Buffer)
gzipIn := gzip.NewWriter(buf)
_, err := io.Copy(gzipIn, src)
if err != nil {
return nil, err
}
err = gzipIn.Close()
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func hashToHex(b []byte) string {
h := sha256.Sum256(b)
return hex.EncodeToString(h[:])
}
func randString() (string, error) {
c := 20
b := make([]byte, c)
_, err := rand.Read(b)
if err != nil {
return "", err
}
return strings.ToLower(base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(b)), nil
}
func awsStringSign4(key string, date string, region string, service string, toSign string) string {
mac := func(key, payload []byte) []byte {
f := hmac.New(sha256.New, key)
_, _ = f.Write(payload)
ret := f.Sum(nil)
return ret
}
keySecret := []byte("AWS4" + key)
keyDate := mac(keySecret, []byte(date))
keyRegion := mac(keyDate, []byte(region))
keyService := mac(keyRegion, []byte(service))
keySigning := mac(keyService, []byte("aws4_request"))
signedString := mac(keySigning, []byte(toSign))
return hex.EncodeToString(signedString)
}
func s3put(src io.Reader, bucket string, name string) (string, error) {
buf, err := gzipSource(src)
if err != nil {
return "", err
}
randSuffix, err := randString()
if err != nil {
return "", err
}
name += "-" + randSuffix + ".gz"
_, err = awsCall("s3", bucket+".s3.amazonaws.com", name, "PUT", buf)
if err != nil {
return "", err
}
where := fmt.Sprintf("(fetch with: ```curl -s -o - https://%s.s3.amazonaws.com/%s | zcat -d | less```)", bucket, name)
return where, nil
}
func lambdaInvoke(functionName string, buf []byte) error {
_, err := awsCall("lambda", "lambda.us-east-1.amazonaws.com", "2015-03-31/functions/"+functionName+"/invocations", "POST", buf)
return err
}
// generic aws call without the dependencies, adopted from this shell script:
//
// https://superuser.com/questions/279986/uploading-files-to-s3-account-from-linux-command-line
//
func awsCall(service string, host string, path string, method string, buf []byte) (response []byte, err error) {
payloadHash := hashToHex(buf)
now := time.Now().UTC()
dateLong := now.Format("20060102T150405Z")
dateShort := now.Format("20060102")
contentType := "application/gzip"
storageClass := "STANDARD"
headerList := "content-type;host;x-amz-content-sha256;x-amz-date;x-amz-storage-class"
canonicalRequest := strings.Join([]string{
method,
"/" + path,
"",
"content-type:" + contentType,
"host:" + host,
"x-amz-content-sha256:" + payloadHash,
"x-amz-date:" + dateLong,
"x-amz-storage-class:" + storageClass,
"",
headerList,
payloadHash,
}, "\n")
canonicalRequestHash := hashToHex([]byte(canonicalRequest))
authType := "AWS4-HMAC-SHA256"
region := "us-east-1"
req2 := strings.Join([]string{dateShort, region, service, "aws4_request"}, "/")
stringToSign := strings.Join([]string{
authType,
dateLong,
req2,
canonicalRequestHash,
}, "\n")
keyID := os.Getenv("CITOGO_AWS_ACCESS_KEY_ID")
key := os.Getenv("CITOGO_AWS_SECRET_ACCESS_KEY")
if keyID == "" || key == "" {
return response, errors.New("need CITOGO_AWS_ACCESS_KEY_ID and CITOGO_AWS_SECRET_ACCESS_KEY environment variables")
}
sig := awsStringSign4(key, dateShort, region, service, stringToSign)
authorization := authType + " " + strings.Join([]string{
"Credential=" + strings.Join([]string{keyID, dateShort, region, service, "aws4_request"}, "/"),
"SignedHeaders=" + headerList,
"Signature=" + sig,
}, ", ")
client := &http.Client{}
url := "https://" + host + "/" + path
req, err := http.NewRequest(method, url, bytes.NewReader(buf))
if err != nil {
return response, err
}
req.Header.Set("Content-type", contentType)
req.Header.Set("Host", host)
req.Header.Set("X-Amz-Content-SHA256", payloadHash)
req.Header.Set("X-Amz-Date", dateLong)
req.Header.Set("X-Amz-Storage-Class", storageClass)
req.Header.Set("Authorization", authorization)
resp, err := client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return response, err
}
return body, nil
}