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server.go
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server.go
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package s3test
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/hex"
"encoding/xml"
"fmt"
"github.com/AdRoll/goamz/s3"
"io"
"io/ioutil"
"log"
"math/rand"
"net"
"net/http"
"net/url"
"regexp"
"sort"
"strconv"
"strings"
"sync"
"time"
)
const debug = false
type s3Error struct {
statusCode int
XMLName struct{} `xml:"Error"`
Code string
Message string
BucketName string
RequestId string
HostId string
}
type action struct {
srv *Server
w http.ResponseWriter
req *http.Request
reqId string
}
// Config controls the internal behaviour of the Server. A nil config is the default
// and behaves as if all configurations assume their default behaviour. Once passed
// to NewServer, the configuration must not be modified.
type Config struct {
// Send409Conflict controls how the Server will respond to calls to PUT on a
// previously existing bucket. The default is false, and corresponds to the
// us-east-1 s3 enpoint. Setting this value to true emulates the behaviour of
// all other regions.
// http://docs.amazonwebservices.com/AmazonS3/latest/API/ErrorResponses.html
Send409Conflict bool
// Address on which to listen. By default, a random port is assigned by the
// operating system and the server listens on localhost.
ListenAddress string
}
func (c *Config) send409Conflict() bool {
if c != nil {
return c.Send409Conflict
}
return false
}
// Server is a fake S3 server for testing purposes.
// All of the data for the server is kept in memory.
type Server struct {
url string
reqId int
listener net.Listener
mu sync.Mutex
buckets map[string]*bucket
config *Config
}
type bucket struct {
name string
acl s3.ACL
ctime time.Time
objects map[string]*object
multipartUploads map[string][]*multipartUploadPart
}
type object struct {
name string
mtime time.Time
meta http.Header // metadata to return with requests.
checksum []byte // also held as Content-MD5 in meta.
data []byte
}
type multipartUploadPart struct {
data []byte
etag string
lastModified time.Time
}
// A resource encapsulates the subject of an HTTP request.
// The resource referred to may or may not exist
// when the request is made.
type resource interface {
put(a *action) interface{}
get(a *action) interface{}
post(a *action) interface{}
delete(a *action) interface{}
}
func NewServer(config *Config) (*Server, error) {
listenAddress := "localhost:0"
if config != nil && config.ListenAddress != "" {
listenAddress = config.ListenAddress
}
l, err := net.Listen("tcp", listenAddress)
if err != nil {
return nil, fmt.Errorf("cannot listen on localhost: %v", err)
}
srv := &Server{
listener: l,
url: "http://" + l.Addr().String(),
buckets: make(map[string]*bucket),
config: config,
}
go http.Serve(l, http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
srv.serveHTTP(w, req)
}))
return srv, nil
}
// Quit closes down the server.
func (srv *Server) Quit() {
srv.listener.Close()
}
// URL returns a URL for the server.
func (srv *Server) URL() string {
return srv.url
}
func fatalf(code int, codeStr string, errf string, a ...interface{}) {
panic(&s3Error{
statusCode: code,
Code: codeStr,
Message: fmt.Sprintf(errf, a...),
})
}
// serveHTTP serves the S3 protocol.
func (srv *Server) serveHTTP(w http.ResponseWriter, req *http.Request) {
// ignore error from ParseForm as it's usually spurious.
req.ParseForm()
srv.mu.Lock()
defer srv.mu.Unlock()
if debug {
log.Printf("s3test %q %q", req.Method, req.URL)
}
a := &action{
srv: srv,
w: w,
req: req,
reqId: fmt.Sprintf("%09X", srv.reqId),
}
srv.reqId++
var r resource
defer func() {
switch err := recover().(type) {
case *s3Error:
switch r := r.(type) {
case objectResource:
err.BucketName = r.bucket.name
case bucketResource:
err.BucketName = r.name
}
err.RequestId = a.reqId
// TODO HostId
w.Header().Set("Content-Type", `xml version="1.0" encoding="UTF-8"`)
w.WriteHeader(err.statusCode)
xmlMarshal(w, err)
case nil:
default:
panic(err)
}
}()
r = srv.resourceForURL(req.URL)
var resp interface{}
switch req.Method {
case "PUT":
resp = r.put(a)
case "GET", "HEAD":
resp = r.get(a)
case "DELETE":
resp = r.delete(a)
case "POST":
resp = r.post(a)
default:
fatalf(400, "MethodNotAllowed", "unknown http request method %q", req.Method)
}
if resp != nil && req.Method != "HEAD" {
xmlMarshal(w, resp)
}
}
// xmlMarshal is the same as xml.Marshal except that
// it panics on error. The marshalling should not fail,
// but we want to know if it does.
func xmlMarshal(w io.Writer, x interface{}) {
if err := xml.NewEncoder(w).Encode(x); err != nil {
panic(fmt.Errorf("error marshalling %#v: %v", x, err))
}
}
// In a fully implemented test server, each of these would have
// its own resource type.
var unimplementedBucketResourceNames = map[string]bool{
"acl": true,
"lifecycle": true,
"policy": true,
"location": true,
"logging": true,
"notification": true,
"versions": true,
"requestPayment": true,
"versioning": true,
"website": true,
"uploads": true,
}
var unimplementedObjectResourceNames = map[string]bool{
"acl": true,
"torrent": true,
}
var pathRegexp = regexp.MustCompile("/(([^/]+)(/(.*))?)?")
// resourceForURL returns a resource object for the given URL.
func (srv *Server) resourceForURL(u *url.URL) (r resource) {
m := pathRegexp.FindStringSubmatch(u.Path)
if m == nil {
fatalf(404, "InvalidURI", "Couldn't parse the specified URI")
}
bucketName := m[2]
objectName := m[4]
if bucketName == "" {
return nullResource{} // root
}
b := bucketResource{
name: bucketName,
bucket: srv.buckets[bucketName],
}
q := u.Query()
if objectName == "" {
for name := range q {
if unimplementedBucketResourceNames[name] {
return nullResource{}
}
}
return b
}
if b.bucket == nil {
fatalf(404, "NoSuchBucket", "The specified bucket does not exist")
}
objr := objectResource{
name: objectName,
version: q.Get("versionId"),
bucket: b.bucket,
}
for name := range q {
if unimplementedObjectResourceNames[name] {
return nullResource{}
}
}
if obj := objr.bucket.objects[objr.name]; obj != nil {
objr.object = obj
}
return objr
}
// nullResource has error stubs for all resource methods.
type nullResource struct{}
func notAllowed() interface{} {
fatalf(400, "MethodNotAllowed", "The specified method is not allowed against this resource")
return nil
}
func (nullResource) put(a *action) interface{} { return notAllowed() }
func (nullResource) get(a *action) interface{} { return notAllowed() }
func (nullResource) post(a *action) interface{} { return notAllowed() }
func (nullResource) delete(a *action) interface{} { return notAllowed() }
const timeFormat = "2006-01-02T15:04:05.000Z07:00"
type bucketResource struct {
name string
bucket *bucket // non-nil if the bucket already exists.
}
// GET on a bucket lists the objects in the bucket.
// http://docs.amazonwebservices.com/AmazonS3/latest/API/RESTBucketGET.html
func (r bucketResource) get(a *action) interface{} {
if r.bucket == nil {
fatalf(404, "NoSuchBucket", "The specified bucket does not exist")
}
delimiter := a.req.Form.Get("delimiter")
marker := a.req.Form.Get("marker")
maxKeys := -1
if s := a.req.Form.Get("max-keys"); s != "" {
i, err := strconv.Atoi(s)
if err != nil || i < 0 {
fatalf(400, "invalid value for max-keys: %q", s)
}
maxKeys = i
}
prefix := a.req.Form.Get("prefix")
a.w.Header().Set("Content-Type", "application/xml")
if a.req.Method == "HEAD" {
return nil
}
var objs orderedObjects
// first get all matching objects and arrange them in alphabetical order.
for name, obj := range r.bucket.objects {
if strings.HasPrefix(name, prefix) {
objs = append(objs, obj)
}
}
sort.Sort(objs)
if maxKeys <= 0 {
maxKeys = 1000
}
resp := &s3.ListResp{
Name: r.bucket.name,
Prefix: prefix,
Delimiter: delimiter,
Marker: marker,
MaxKeys: maxKeys,
}
var prefixes []string
for _, obj := range objs {
if !strings.HasPrefix(obj.name, prefix) {
continue
}
name := obj.name
isPrefix := false
if delimiter != "" {
if i := strings.Index(obj.name[len(prefix):], delimiter); i >= 0 {
name = obj.name[:len(prefix)+i+len(delimiter)]
if prefixes != nil && prefixes[len(prefixes)-1] == name {
continue
}
isPrefix = true
}
}
if name <= marker {
continue
}
if len(resp.Contents)+len(prefixes) >= maxKeys {
resp.IsTruncated = true
break
}
if isPrefix {
prefixes = append(prefixes, name)
} else {
// Contents contains only keys not found in CommonPrefixes
resp.Contents = append(resp.Contents, obj.s3Key())
}
}
resp.CommonPrefixes = prefixes
return resp
}
// orderedObjects holds a slice of objects that can be sorted
// by name.
type orderedObjects []*object
func (s orderedObjects) Len() int {
return len(s)
}
func (s orderedObjects) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s orderedObjects) Less(i, j int) bool {
return s[i].name < s[j].name
}
func (obj *object) s3Key() s3.Key {
return s3.Key{
Key: obj.name,
LastModified: obj.mtime.Format(timeFormat),
Size: int64(len(obj.data)),
ETag: fmt.Sprintf(`"%x"`, obj.checksum),
// TODO StorageClass
// TODO Owner
}
}
// DELETE on a bucket deletes the bucket if it's not empty.
func (r bucketResource) delete(a *action) interface{} {
b := r.bucket
if b == nil {
fatalf(404, "NoSuchBucket", "The specified bucket does not exist")
}
if len(b.objects) > 0 {
fatalf(400, "BucketNotEmpty", "The bucket you tried to delete is not empty")
}
delete(a.srv.buckets, b.name)
return nil
}
// PUT on a bucket creates the bucket.
// http://docs.amazonwebservices.com/AmazonS3/latest/API/RESTBucketPUT.html
func (r bucketResource) put(a *action) interface{} {
var created bool
if r.bucket == nil {
if !validBucketName(r.name) {
fatalf(400, "InvalidBucketName", "The specified bucket is not valid")
}
if loc := locationConstraint(a); loc == "" {
fatalf(400, "InvalidRequets", "The unspecified location constraint is incompatible for the region specific endpoint this request was sent to.")
}
// TODO validate acl
r.bucket = &bucket{
name: r.name,
// TODO default acl
objects: make(map[string]*object),
multipartUploads: make(map[string][]*multipartUploadPart),
}
a.srv.buckets[r.name] = r.bucket
created = true
}
if !created && a.srv.config.send409Conflict() {
fatalf(409, "BucketAlreadyOwnedByYou", "Your previous request to create the named bucket succeeded and you already own it.")
}
r.bucket.acl = s3.ACL(a.req.Header.Get("x-amz-acl"))
return nil
}
func (r bucketResource) post(a *action) interface{} {
if _, multiDel := a.req.URL.Query()["delete"]; multiDel {
return r.multiDel(a)
}
fatalf(400, "Method", "bucket operation not supported")
return nil
}
func (b bucketResource) multiDel(a *action) interface{} {
type multiDelRequestObject struct {
Key string
VersionId string
}
type multiDelRequest struct {
Quiet bool
Object []*multiDelRequestObject
}
type multiDelDelete struct {
XMLName struct{} `xml:"Deleted"`
Key string
}
type multiDelError struct {
XMLName struct{} `xml:"Error"`
Key string
Code string
Message string
}
type multiDelResult struct {
XMLName struct{} `xml:"DeleteResult"`
Deleted []*multiDelDelete
Error []*multiDelError
}
req := &multiDelRequest{}
if err := xml.NewDecoder(a.req.Body).Decode(req); err != nil {
fatalf(400, "InvalidRequest", err.Error())
}
res := &multiDelResult{
Deleted: []*multiDelDelete{},
Error: []*multiDelError{},
}
for _, o := range req.Object {
if _, exists := b.bucket.objects[o.Key]; exists {
delete(b.bucket.objects, o.Key)
res.Deleted = append(res.Deleted, &multiDelDelete{
Key: o.Key,
})
} else {
res.Error = append(res.Error, &multiDelError{
Key: o.Key,
Code: "AccessDenied",
Message: "Access Denied",
})
}
}
return res
}
// validBucketName returns whether name is a valid bucket name.
// Here are the rules, from:
// http://docs.amazonwebservices.com/AmazonS3/2006-03-01/dev/BucketRestrictions.html
//
// Can contain lowercase letters, numbers, periods (.), underscores (_),
// and dashes (-). You can use uppercase letters for buckets only in the
// US Standard region.
//
// Must start with a number or letter
//
// Must be between 3 and 255 characters long
//
// There's one extra rule (Must not be formatted as an IP address (e.g., 192.168.5.4)
// but the real S3 server does not seem to check that rule, so we will not
// check it either.
//
func validBucketName(name string) bool {
if len(name) < 3 || len(name) > 255 {
return false
}
r := name[0]
if !(r >= '0' && r <= '9' || r >= 'a' && r <= 'z') {
return false
}
for _, r := range name {
switch {
case r >= '0' && r <= '9':
case r >= 'a' && r <= 'z':
case r == '_' || r == '-':
case r == '.':
default:
return false
}
}
return true
}
var responseParams = map[string]bool{
"content-type": true,
"content-language": true,
"expires": true,
"cache-control": true,
"content-disposition": true,
"content-encoding": true,
}
type objectResource struct {
name string
version string
bucket *bucket // always non-nil.
object *object // may be nil.
}
// GET on an object gets the contents of the object.
// http://docs.amazonwebservices.com/AmazonS3/latest/API/RESTObjectGET.html
func (objr objectResource) get(a *action) interface{} {
obj := objr.object
if obj == nil {
fatalf(404, "NoSuchKey", "The specified key does not exist.")
}
h := a.w.Header()
// add metadata
for name, d := range obj.meta {
h[name] = d
}
// override header values in response to request parameters.
for name, vals := range a.req.Form {
if strings.HasPrefix(name, "response-") {
name = name[len("response-"):]
if !responseParams[name] {
continue
}
h.Set(name, vals[0])
}
}
if r := a.req.Header.Get("Range"); r != "" {
fatalf(400, "NotImplemented", "range unimplemented")
}
// TODO Last-Modified-Since
// TODO If-Modified-Since
// TODO If-Unmodified-Since
// TODO If-Match
// TODO If-None-Match
// TODO Connection: close ??
// TODO x-amz-request-id
h.Set("Content-Length", fmt.Sprint(len(obj.data)))
h.Set("ETag", hex.EncodeToString(obj.checksum))
h.Set("Last-Modified", obj.mtime.Format(time.RFC1123))
if a.req.Method == "HEAD" {
return nil
}
// TODO avoid holding the lock when writing data.
_, err := a.w.Write(obj.data)
if err != nil {
// we can't do much except just log the fact.
log.Printf("error writing data: %v", err)
}
return nil
}
var metaHeaders = map[string]bool{
"Content-MD5": true,
"x-amz-acl": true,
"Content-Type": true,
"Content-Encoding": true,
"Content-Disposition": true,
}
// PUT on an object creates the object.
func (objr objectResource) put(a *action) interface{} {
// TODO Cache-Control header
// TODO Expires header
// TODO x-amz-server-side-encryption
// TODO x-amz-storage-class
uploadId := a.req.URL.Query().Get("uploadId")
// Check that the upload ID is valid if this is a multipart upload
if uploadId != "" {
if _, ok := objr.bucket.multipartUploads[uploadId]; !ok {
fatalf(404, "NoSuchUpload", "The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed.")
}
partNumberStr := a.req.URL.Query().Get("partNumber")
if partNumberStr == "" {
fatalf(400, "InvalidRequest", "Missing partNumber parameter")
}
partNumber, err := strconv.ParseUint(partNumberStr, 10, 32)
if err != nil {
fatalf(400, "InvalidRequest", "partNumber is not a number")
}
// Parts are 1-indexed for multipart uploads
if uint(partNumber)-1 != uint(len(objr.bucket.multipartUploads[uploadId])) {
fatalf(400, "InvalidRequest", "Invalid part number")
}
}
var expectHash []byte
if c := a.req.Header.Get("Content-MD5"); c != "" {
var err error
expectHash, err = base64.StdEncoding.DecodeString(c)
if err != nil || len(expectHash) != md5.Size {
fatalf(400, "InvalidDigest", "The Content-MD5 you specified was invalid")
}
}
sum := md5.New()
// TODO avoid holding lock while reading data.
data, err := ioutil.ReadAll(io.TeeReader(a.req.Body, sum))
if err != nil {
fatalf(400, "TODO", "read error")
}
gotHash := sum.Sum(nil)
if expectHash != nil && bytes.Compare(gotHash, expectHash) != 0 {
fatalf(400, "BadDigest", "The Content-MD5 you specified did not match what we received")
}
if a.req.ContentLength >= 0 && int64(len(data)) != a.req.ContentLength {
fatalf(400, "IncompleteBody", "You did not provide the number of bytes specified by the Content-Length HTTP header")
}
etag := fmt.Sprintf("\"%x\"", gotHash)
a.w.Header().Add("ETag", etag)
if uploadId == "" {
// For traditional uploads
// TODO is this correct, or should we erase all previous metadata?
obj := objr.object
if obj == nil {
obj = &object{
name: objr.name,
meta: make(http.Header),
}
}
// PUT request has been successful - save data and metadata
for key, values := range a.req.Header {
key = http.CanonicalHeaderKey(key)
if metaHeaders[key] || strings.HasPrefix(key, "X-Amz-Meta-") {
obj.meta[key] = values
}
}
obj.data = data
obj.checksum = gotHash
obj.mtime = time.Now()
objr.bucket.objects[objr.name] = obj
} else {
// For multipart commit
parts := objr.bucket.multipartUploads[uploadId]
part := &multipartUploadPart{
data,
etag,
time.Now(),
}
objr.bucket.multipartUploads[uploadId] = append(parts, part)
}
return nil
}
func (objr objectResource) delete(a *action) interface{} {
uploadId := a.req.URL.Query().Get("uploadId")
if uploadId == "" {
// Traditional object delete
delete(objr.bucket.objects, objr.name)
} else {
// Multipart commit abort
_, ok := objr.bucket.multipartUploads[uploadId]
if !ok {
fatalf(404, "NoSuchUpload", "The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed.")
}
delete(objr.bucket.multipartUploads, uploadId)
}
return nil
}
func (objr objectResource) post(a *action) interface{} {
// Check if we're initializing a multipart upload
if _, ok := a.req.URL.Query()["uploads"]; ok {
type multipartInitResponse struct {
XMLName struct{} `xml:"InitiateMultipartUploadResult"`
Bucket string
Key string
UploadId string
}
uploadId := strconv.FormatInt(rand.Int63(), 16)
objr.bucket.multipartUploads[uploadId] = []*multipartUploadPart{}
return &multipartInitResponse{
Bucket: objr.bucket.name,
Key: objr.name,
UploadId: uploadId,
}
}
// Check if we're completing a multipart upload
if uploadId := a.req.URL.Query().Get("uploadId"); uploadId != "" {
type multipartCompleteRequestPart struct {
XMLName struct{} `xml:"Part"`
PartNumber uint
ETag string
}
type multipartCompleteRequest struct {
XMLName struct{} `xml:"CompleteMultipartUpload"`
Part []multipartCompleteRequestPart
}
type multipartCompleteResponse struct {
XMLName struct{} `xml:"CompleteMultipartUploadResult"`
Location string
Bucket string
Key string
ETag string
}
parts, ok := objr.bucket.multipartUploads[uploadId]
if !ok {
fatalf(404, "NoSuchUpload", "The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed.")
}
req := &multipartCompleteRequest{}
if err := xml.NewDecoder(a.req.Body).Decode(req); err != nil {
fatalf(400, "InvalidRequest", err.Error())
}
if len(req.Part) != len(parts) {
fatalf(400, "InvalidRequest", fmt.Sprintf("Number of parts does not match: expected %d, received %d", len(parts), len(req.Part)))
}
sum := md5.New()
data := &bytes.Buffer{}
w := io.MultiWriter(sum, data)
for i, p := range parts {
reqPart := req.Part[i]
if reqPart.PartNumber != uint(1+i) {
fatalf(400, "InvalidRequest", "Bad part number")
}
if reqPart.ETag != p.etag {
fatalf(400, "InvalidRequest", fmt.Sprintf("Invalid etag for part %d", reqPart.PartNumber))
}
w.Write(p.data)
}
delete(objr.bucket.multipartUploads, uploadId)
obj := objr.object
if obj == nil {
obj = &object{
name: objr.name,
meta: make(http.Header),
}
}
obj.data = data.Bytes()
obj.checksum = sum.Sum(nil)
obj.mtime = time.Now()
objr.bucket.objects[objr.name] = obj
objectLocation := fmt.Sprintf("http://%s/%s/%s", a.srv.listener.Addr().String(), objr.bucket.name, objr.name)
return &multipartCompleteResponse{
Location: objectLocation,
Bucket: objr.bucket.name,
Key: objr.name,
ETag: uploadId,
}
}
fatalf(400, "MethodNotAllowed", "The specified method is not allowed against this resource")
return nil
}
type CreateBucketConfiguration struct {
LocationConstraint string
}
// locationConstraint parses the <CreateBucketConfiguration /> request body (if present).
// If there is no body, an empty string will be returned.
func locationConstraint(a *action) string {
var body bytes.Buffer
if _, err := io.Copy(&body, a.req.Body); err != nil {
fatalf(400, "InvalidRequest", err.Error())
}
if body.Len() == 0 {
return ""
}
var loc CreateBucketConfiguration
if err := xml.NewDecoder(&body).Decode(&loc); err != nil {
fatalf(400, "InvalidRequest", err.Error())
}
return loc.LocationConstraint
}