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s3.go
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//
// goamz - Go packages to interact with the Amazon Web Services.
//
// https://wiki.ubuntu.com/goamz
//
// Copyright (c) 2011 Canonical Ltd.
//
// Written by Gustavo Niemeyer <gustavo.niemeyer@canonical.com>
//
package s3
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strconv"
"strings"
"time"
"github.com/mattetti/goamz-fork/aws"
)
const debug = false
// The S3 type encapsulates operations with an S3 region.
type S3 struct {
aws.Auth
aws.Region
private byte // Reserve the right of using private data.
}
// The Bucket type encapsulates operations with an S3 bucket.
type Bucket struct {
*S3
Name string
}
// The Owner type represents the owner of the object in an S3 bucket.
type Owner struct {
ID string
DisplayName string
}
type CustomHeaders map[string][]string
var attempts = aws.AttemptStrategy{
Min: 5,
Total: 5 * time.Second,
Delay: 200 * time.Millisecond,
}
// New creates a new S3.
func New(auth aws.Auth, region aws.Region) *S3 {
return &S3{auth, region, 0}
}
// Bucket returns a Bucket with the given name.
func (s3 *S3) Bucket(name string) *Bucket {
if s3.Region.S3BucketEndpoint != "" || s3.Region.S3LowercaseBucket {
name = strings.ToLower(name)
}
return &Bucket{s3, name}
}
var createBucketConfiguration = `<CreateBucketConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<LocationConstraint>%s</LocationConstraint>
</CreateBucketConfiguration>`
// locationConstraint returns an io.Reader specifying a LocationConstraint if
// required for the region.
//
// See http://goo.gl/bh9Kq for details.
func (s3 *S3) locationConstraint() io.Reader {
constraint := ""
if s3.Region.S3LocationConstraint {
constraint = fmt.Sprintf(createBucketConfiguration, s3.Region.Name)
}
return strings.NewReader(constraint)
}
type ACL string
const (
Private = ACL("private")
PublicRead = ACL("public-read")
PublicReadWrite = ACL("public-read-write")
AuthenticatedRead = ACL("authenticated-read")
BucketOwnerRead = ACL("bucket-owner-read")
BucketOwnerFull = ACL("bucket-owner-full-control")
)
// BucketAvailable verifies that a bucket already exists and if we have permission
// access to it.
//
// see http://goo.gl/iUJfX for details.
func (b *Bucket) BucketAvailable() bool {
req := &request{
method: "HEAD",
bucket: b.Name,
}
return b.S3.query(req, nil) == nil
}
// PutBucket creates a new bucket.
//
// See http://goo.gl/ndjnR for details.
func (b *Bucket) PutBucket(perm ACL) error {
headers := map[string][]string{
"x-amz-acl": {string(perm)},
}
req := &request{
method: "PUT",
bucket: b.Name,
path: "/",
headers: headers,
payload: b.locationConstraint(),
}
return b.S3.query(req, nil)
}
// DelBucket removes an existing S3 bucket. All objects in the bucket must
// be removed before the bucket itself can be removed.
//
// See http://goo.gl/GoBrY for details.
func (b *Bucket) DelBucket() (err error) {
req := &request{
method: "DELETE",
bucket: b.Name,
path: "/",
}
for attempt := attempts.Start(); attempt.Next(); {
err = b.S3.query(req, nil)
if !shouldRetry(err) {
break
}
}
return err
}
// Get retrieves an object from an S3 bucket.
//
// See http://goo.gl/isCO7 for details.
func (b *Bucket) Get(path string) (data []byte, err error) {
body, err := b.GetReader(path)
if err != nil {
return nil, err
}
data, err = ioutil.ReadAll(body)
body.Close()
return data, err
}
// Metadata returns the metadata assigned to the key available at the designed path.
// see http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectHEAD.html for details.
func (b *Bucket) Metadata(path string) (map[string][]string, error) {
req := &request{
method: "HEAD",
bucket: b.Name,
baseurl: "s3.amazonaws.com",
path: path,
}
err := b.S3.prepare(req)
if err != nil {
return nil, err
}
hresp, err := b.S3.run(req)
if err != nil {
return nil, err
}
return hresp.Header, nil
}
// ObjectAvailable verifies that an object already exists and if we have permission
// access to it.
//
// see http://goo.gl/ZjZeF for details.
func (b *Bucket) ObjectAvailable(path string) (bool, error) {
req := &request{
method: "HEAD",
bucket: b.Name,
baseurl: "s3.amazonaws.com",
path: path,
}
if err := b.S3.query(req, nil); err != nil {
if s3err, ok := err.(*Error); ok {
// can't check just the Code == NoSuchKey, because we issue a HEAD
// request so we don't receive a body with the error description
// (where the Code would be). Just checking the 404 would be enough,
// but in case we ever change the method, let's also support the Code.
if s3err.StatusCode == 404 || s3err.Code == "NoSuchKey" {
return false, nil
}
}
return false, err
}
return true, nil
}
// GetReader retrieves an object from a S3 bucket.
// It is the caller's responsibility to call Close on rc when
// finished reading.
func (b *Bucket) GetReader(path string) (rc io.ReadCloser, err error) {
return b.GetReaderWithHeaders(path, nil)
}
// GetReaderWithHeaders retrieves an object from a S3 bucket but also passes custom headers.
// It is the caller's responsibility to call Close on rc when
// finished reading.
// http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectGET.html explains the custom request headers one might want to use.
func (b *Bucket) GetReaderWithHeaders(path string, custHeaders CustomHeaders) (rc io.ReadCloser, err error) {
headers := map[string][]string{}
for k, v := range custHeaders {
headers[k] = v
}
req := &request{
bucket: b.Name,
path: path,
headers: headers,
}
if err := b.S3.prepare(req); err != nil {
return nil, err
}
for attempt := attempts.Start(); attempt.Next(); {
hresp, err := b.S3.run(req)
if shouldRetry(err) && attempt.HasNext() {
continue
}
if err != nil {
return nil, err
}
return hresp.Body, nil
}
panic("unreachable")
}
// amazonShouldEscape returns true if byte should be escaped
// From https://github.com/mitchellh/goamz
func amazonShouldEscape(c byte) bool {
return !((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') || c == '_' || c == '-' || c == '~' || c == '.' || c == '/' || c == ':')
}
// amazonEscape does uri escaping exactly as Amazon does
// From https://github.com/mitchellh/goamz
func amazonEscape(s string) string {
hexCount := 0
for i := 0; i < len(s); i++ {
if amazonShouldEscape(s[i]) {
hexCount++
}
}
if hexCount == 0 {
return s
}
t := make([]byte, len(s)+2*hexCount)
j := 0
for i := 0; i < len(s); i++ {
if c := s[i]; amazonShouldEscape(c) {
t[j] = '%'
t[j+1] = "0123456789ABCDEF"[c>>4]
t[j+2] = "0123456789ABCDEF"[c&15]
j += 3
} else {
t[j] = s[i]
j++
}
}
return string(t)
}
// Put inserts an object into the S3 bucket.
//
// See http://goo.gl/FEBPD for details.
func (b *Bucket) Put(path string, data []byte, contType string, perm ACL) error {
body := bytes.NewBuffer(data)
return b.PutReader(path, body, int64(len(data)), contType, perm)
}
func (b *Bucket) PutWithHeaders(path string, data []byte, custHeaders CustomHeaders, perm ACL) error {
body := bytes.NewBuffer(data)
return b.PutReaderWithHeaders(path, body, int64(len(data)), custHeaders, perm)
}
// Copy copies an object from another bucket into this bucket
// Note: fromPath does not assume this bucket and must include bucket name
// e.g. b.Copy('mypath/myfile', '/yourbucket/yourpath/yourfile', s3.AuthenticatedRead)
//
// See http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html for details
func (b *Bucket) Copy(path string, fromPath string, perm ACL) error {
return b.CopyWithHeaders(path, fromPath, nil, perm)
}
// CopyWithHeaders copies an object from another bucket into this bucket and can set/pass custom headers.
// If you need to update an object's metadata, you need to use this method with the following custom header
// `x-amz-metadata-directive: REPLACE`.
// Note that any metadata you do not include in the old dictionary will be dropped. So to preserve old attributes
// you need to first collect the metadata you want to use and send it as a custom header.
// See http://stackoverflow.com/questions/4754383/how-to-change-metadata-on-an-object-in-amazon-s3
// Note: fromPath does not assume this bucket and must include bucket name
// e.g. b.Copy('mypath/myfile', '/yourbucket/yourpath/yourfile', s3.AuthenticatedRead, nil)
//
// See http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html for details
func (b *Bucket) CopyWithHeaders(path string, fromPath string, custHeaders CustomHeaders, perm ACL) error {
headers := map[string][]string{
// TODO : Here the `fromPath` should probably be amazonEscape`d, but
// I don't want to introduce changes to what already works
"x-amz-copy-source": {fromPath},
}
if custHeaders != nil {
/*
// get original headers since they don't get copied over when copy/editing headers
// this is disabled since it copies all metadata, not the one fields we need.
originHeaders, err := b.Metadata(strings.TrimPrefix(fromPath, fmt.Sprintf("/%s/", b.Name)))
if err != nil {
return err
}
for k, v := range originHeaders {
headers[k] = v
}
*/
// update using the ones we just received.
for k, v := range custHeaders {
headers[k] = v
}
}
headers["x-amz-acl"] = []string{string(perm)}
headers["x-amz-server-side-encryption"] = []string{"AES256"}
req := &request{
method: "PUT",
bucket: b.Name,
path: path,
headers: headers,
}
// From http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html
//
// There are two opportunities for a copy request to return an error. One
// can occur when Amazon S3 receives the copy request and the other can
// occur while Amazon S3 is copying the files. If the error occurs before
// the copy operation starts, you receive a standard Amazon S3 error. If
// the error occurs during the copy operation, the error response is
// embedded in the 200 OK response. This means that a 200 OK response can
// contain either a success or an error. Make sure to design your
// application to parse the contents of the response and handle it
// appropriately.
errRes := &Error{}
if err := b.S3.query(req, errRes); err != nil {
return err
}
// check if we have an errRes
if errRes.Code != "" {
return errRes
}
return nil
}
// PutReader inserts an object into the S3 bucket by consuming data
// from r until EOF.
func (b *Bucket) PutReader(path string, r io.Reader, length int64, contType string, perm ACL) error {
customHeaders := map[string][]string{
"Content-Type": {contType},
}
return b.PutReaderWithHeaders(path, r, length, customHeaders, perm)
}
// PutReaderWithHeaders is similar to PutReader but with custom headers
// the required, calculated headers are automatically assigned.
// Useful to set more than just Content-Type.
func (b *Bucket) PutReaderWithHeaders(path string, r io.Reader, length int64, custHeaders CustomHeaders, perm ACL) error {
headers := map[string][]string{
"Content-Length": {strconv.FormatInt(length, 10)},
"x-amz-acl": {string(perm)},
"x-amz-server-side-encryption": {"AES256"},
}
for k, v := range custHeaders {
headers[k] = v
}
req := &request{
method: "PUT",
bucket: b.Name,
path: path,
headers: headers,
payload: r,
}
return b.S3.query(req, nil)
}
// Del removes an object from the S3 bucket.
//
// See http://goo.gl/APeTt for details.
func (b *Bucket) Del(path string) error {
req := &request{
method: "DELETE",
bucket: b.Name,
path: path,
}
return b.S3.query(req, nil)
}
// The ListResp type holds the results of a List bucket operation.
type ListResp struct {
Name string
Prefix string
Delimiter string
Marker string
MaxKeys int
// IsTruncated is true if the results have been truncated because
// there are more keys and prefixes than can fit in MaxKeys.
// N.B. this is the opposite sense to that documented (incorrectly) in
// http://goo.gl/YjQTc
IsTruncated bool
Contents []Key
CommonPrefixes []string `xml:">Prefix"`
}
// The Key type represents an item stored in an S3 bucket.
type Key struct {
Key string
LastModified string
Size int64
// ETag gives the hex-encoded MD5 sum of the contents,
// surrounded with double-quotes.
ETag string
StorageClass string
Owner Owner
}
// List returns information about objects in an S3 bucket.
//
// The prefix parameter limits the response to keys that begin with the
// specified prefix.
//
// The delim parameter causes the response to group all of the keys that
// share a common prefix up to the next delimiter in a single entry within
// the CommonPrefixes field. You can use delimiters to separate a bucket
// into different groupings of keys, similar to how folders would work.
//
// The marker parameter specifies the key to start with when listing objects
// in a bucket. Amazon S3 lists objects in alphabetical order and
// will return keys alphabetically greater than the marker.
//
// The max parameter specifies how many keys + common prefixes to return in
// the response. The default is 1000.
//
// For example, given these keys in a bucket:
//
// index.html
// index2.html
// photos/2006/January/sample.jpg
// photos/2006/February/sample2.jpg
// photos/2006/February/sample3.jpg
// photos/2006/February/sample4.jpg
//
// Listing this bucket with delimiter set to "/" would yield the
// following result:
//
// &ListResp{
// Name: "sample-bucket",
// MaxKeys: 1000,
// Delimiter: "/",
// Contents: []Key{
// {Key: "index.html", "index2.html"},
// },
// CommonPrefixes: []string{
// "photos/",
// },
// }
//
// Listing the same bucket with delimiter set to "/" and prefix set to
// "photos/2006/" would yield the following result:
//
// &ListResp{
// Name: "sample-bucket",
// MaxKeys: 1000,
// Delimiter: "/",
// Prefix: "photos/2006/",
// CommonPrefixes: []string{
// "photos/2006/February/",
// "photos/2006/January/",
// },
// }
//
// See http://goo.gl/YjQTc for details.
func (b *Bucket) List(prefix, delim, marker string, max int) (result *ListResp, err error) {
params := map[string][]string{
"prefix": {prefix},
"delimiter": {delim},
"marker": {marker},
}
if max != 0 {
params["max-keys"] = []string{strconv.FormatInt(int64(max), 10)}
}
req := &request{
bucket: b.Name,
params: params,
}
result = &ListResp{}
for attempt := attempts.Start(); attempt.Next(); {
err = b.S3.query(req, result)
if !shouldRetry(err) {
break
}
}
if err != nil {
return nil, err
}
return result, nil
}
// URL returns a non-signed URL that allows retriving the
// object at path. It only works if the object is publicly
// readable (see SignedURL).
func (b *Bucket) URL(path string) string {
req := &request{
bucket: b.Name,
path: path,
}
err := b.S3.prepare(req)
if err != nil {
panic(err)
}
u, err := req.url()
if err != nil {
panic(err)
}
u.RawQuery = ""
return u.String()
}
// SignedURL returns a signed URL that allows anyone holding the URL
// to retrieve the object at path. The signature is valid until expires.
func (b *Bucket) SignedURL(path string, expires time.Time) string {
req := &request{
bucket: b.Name,
path: path,
params: url.Values{"Expires": {strconv.FormatInt(expires.Unix(), 10)}},
}
err := b.S3.prepare(req)
if err != nil {
panic(err)
}
u, err := req.url()
if err != nil {
panic(err)
}
return u.String()
}
// SignedHeadURL returns a signed URL to be used when performing a HEAD request.
// This is different from the Metadata function, which returns the actual headers.
// A use-case for this is, for example, when a front-end will need a URL that they
// can use to poll until the object is present.
func (b *Bucket) SignedHeadURL(path string, expires time.Time) string {
req := &request{
bucket: b.Name,
path: path,
method: "HEAD",
params: url.Values{"Expires": {strconv.FormatInt(expires.Unix(), 10)}},
}
err := b.S3.prepare(req)
if err != nil {
panic(err)
}
u, err := req.url()
if err != nil {
panic(err)
}
return u.String()
}
// SignedAttachmentURL returns a signed url that causes the object to be downloaded instead of
// accessed through the web interface.
func (b *Bucket) SignedAttachmentURL(path, filename string, expires time.Time) string {
req := &request{
bucket: b.Name,
path: path,
params: url.Values{
"Expires": {strconv.FormatInt(expires.Unix(), 10)},
"response-content-disposition": {fmt.Sprintf("attachment; filename=\"%s\"", filename)},
},
}
err := b.S3.prepare(req)
if err != nil {
panic(err)
}
u, err := req.url()
if err != nil {
panic(err)
}
return u.String()
}
type request struct {
method string
bucket string
path string
signpath string
params url.Values
headers http.Header
baseurl string
payload io.Reader
prepared bool
}
func (req *request) url() (*url.URL, error) {
u, err := url.Parse(req.baseurl)
if err != nil {
return nil, fmt.Errorf("bad S3 endpoint URL %q: %v", req.baseurl, err)
}
u.RawQuery = req.params.Encode()
u.Path = req.path
return u, nil
}
// query prepares and runs the req request.
// If resp is not nil, the XML data contained in the response
// body will be unmarshalled on it.
func (s3 *S3) query(req *request, resp interface{}) error {
err := s3.prepare(req)
if err != nil {
return err
}
hresp, err := s3.run(req)
if err != nil {
return err
}
if resp != nil {
err = xml.NewDecoder(hresp.Body).Decode(resp)
}
hresp.Body.Close()
return nil
}
// prepare sets up req to be delivered to S3.
func (s3 *S3) prepare(req *request) error {
if !req.prepared {
req.prepared = true
if req.method == "" {
req.method = "GET"
}
// Copy so they can be mutated without affecting on retries.
params := make(url.Values)
headers := make(http.Header)
for k, v := range req.params {
params[k] = v
}
for k, v := range req.headers {
headers[k] = v
}
req.params = params
req.headers = headers
if !strings.HasPrefix(req.path, "/") {
req.path = "/" + req.path
}
req.signpath = req.path
if req.bucket != "" {
req.baseurl = s3.Region.S3BucketEndpoint
if req.baseurl == "" {
// Use the path method to address the bucket.
req.baseurl = s3.Region.S3Endpoint
req.path = "/" + req.bucket + req.path
} else {
// Just in case, prevent injection.
if strings.IndexAny(req.bucket, "/:@") >= 0 {
return fmt.Errorf("bad S3 bucket: %q", req.bucket)
}
req.baseurl = strings.Replace(req.baseurl, "${bucket}", req.bucket, -1)
}
req.signpath = "/" + req.bucket + req.signpath
}
}
// Always sign again as it's not clear how far the
// server has handled a previous attempt.
u, err := url.Parse(req.baseurl)
if err != nil {
return fmt.Errorf("bad S3 endpoint URL %q: %v", req.baseurl, err)
}
req.headers["Host"] = []string{u.Host}
req.headers["Date"] = []string{time.Now().In(time.UTC).Format(time.RFC1123)}
sign(s3.Auth, req.method, amazonEscape(req.signpath), req.params, req.headers)
return nil
}
// run sends req and returns the http response from the server.
func (s3 *S3) run(req *request) (*http.Response, error) {
if debug {
log.Printf("Running S3 request: %#v", req)
}
u, err := req.url()
if err != nil {
return nil, err
}
hreq := http.Request{
URL: u,
Method: req.method,
ProtoMajor: 1,
ProtoMinor: 1,
Close: true,
Header: req.headers,
}
if v, ok := req.headers["Content-Length"]; ok {
hreq.ContentLength, _ = strconv.ParseInt(v[0], 10, 64)
delete(req.headers, "Content-Length")
}
if req.payload != nil {
hreq.Body = ioutil.NopCloser(req.payload)
}
hresp, err := http.DefaultClient.Do(&hreq)
if err != nil {
return nil, err
}
if debug {
dump, _ := httputil.DumpResponse(hresp, true)
log.Printf("} -> %s\n", dump)
}
if hresp.StatusCode != 200 && hresp.StatusCode != 204 && hresp.StatusCode != 206 {
// the Body is closed in buildError
return nil, buildError(hresp)
}
return hresp, err
}
// Error represents an error in an operation with S3.
type Error struct {
StatusCode int // HTTP status code (200, 403, ...)
Code string // EC2 error code ("UnsupportedOperation", ...)
Message string // The human-oriented error message
BucketName string
RequestId string
HostId string
}
func (e *Error) Error() string {
return fmt.Sprintf("S3:%s: %s", e.Code, e.Message)
}
func buildError(r *http.Response) error {
if debug {
log.Printf("got error (status code %v)", r.StatusCode)
data, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Printf("\tread error: %v", err)
} else {
log.Printf("\tdata:\n%s\n\n", data)
}
r.Body = ioutil.NopCloser(bytes.NewBuffer(data))
}
err := Error{}
// TODO return error if Unmarshal fails?
xml.NewDecoder(r.Body).Decode(&err)
r.Body.Close()
err.StatusCode = r.StatusCode
if err.Message == "" {
err.Message = r.Status
}
if debug {
log.Printf("err: %#v\n", err)
}
return &err
}
func shouldRetry(err error) bool {
if err == nil {
return false
}
switch err {
case io.ErrUnexpectedEOF, io.EOF:
return true
}
switch e := err.(type) {
case *net.DNSError:
return true
case *net.OpError:
switch e.Op {
case "read", "write":
return true
}
case *Error:
switch e.Code {
case "InternalError", "NoSuchUpload", "NoSuchBucket":
return true
}
}
return false
}
func hasCode(err error, code string) bool {
s3err, ok := err.(*Error)
return ok && s3err.Code == code
}