/
util.go
118 lines (104 loc) · 2.26 KB
/
util.go
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package main
import (
"bytes"
"compress/gzip"
"crypto/md5"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"time"
"github.com/kr/s3"
)
type errReader struct {
error
}
func (e errReader) Read(p []byte) (int, error) {
return 0, e.error
}
func (e errReader) Close() error {
return e.error
}
type gzReader struct {
z, r io.ReadCloser
}
func newGzReader(r io.ReadCloser) io.ReadCloser {
var err error
g := new(gzReader)
g.r = r
g.z, err = gzip.NewReader(r)
if err != nil {
return errReader{err}
}
return g
}
func (g *gzReader) Read(p []byte) (int, error) {
return g.z.Read(p)
}
func (g *gzReader) Close() error {
g.z.Close()
return g.r.Close()
}
func fetch(url string, mod *time.Time) io.ReadCloser {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return errReader{err}
}
if mod != nil {
req.Header.Add("If-Modified-Since", mod.Format(http.TimeFormat))
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return errReader{err}
}
if mod != nil && resp.StatusCode == 304 {
return nil
}
if resp.StatusCode != 200 {
err := fmt.Errorf("bad http status from %s: %v", url, resp.Status)
return errReader{err}
}
if s := resp.Header.Get("Last-Modified"); mod != nil && s != "" {
t, err := time.Parse(http.TimeFormat, s)
if err == nil {
*mod = t
}
}
return resp.Body
}
func fetchJSON(url string, mod *time.Time, v interface{}) error {
r := fetch(url, mod)
if r == nil {
return nil
}
defer r.Close()
return json.NewDecoder(r).Decode(v)
}
func s3put(bb *bytes.Buffer, url string) error {
r, _ := http.NewRequest("PUT", url, bb)
r.Header.Set("Date", time.Now().UTC().Format(http.TimeFormat))
r.Header.Set("Content-Disposition", "attachment")
r.Header.Set("X-Amz-Acl", "public-read")
r.Header.Set("Content-Md5", b64md5(bb.Bytes()))
s3.Sign(r, s3keys)
resp, err := http.DefaultClient.Do(r)
if err != nil {
return err
}
if resp.StatusCode != 200 {
body, _ := ioutil.ReadAll(resp.Body)
return fmt.Errorf("s3 status %v putting %q: %q", resp.Status, url, string(body))
}
return nil
}
// returns the base64-encoded md5 of p
func b64md5(p []byte) string {
h := md5.New()
h.Write(p)
return base64.StdEncoding.EncodeToString(h.Sum(nil))
}
type jsonsha struct {
Sha256 []byte `json:"sha256"`
}