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Support XML API (#331) #1164

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Support XML API (#331) #1164

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0a1124f
Support XML API (#331)
tustvold May 12, 2023
fb93ee2
Check bucket exists
tustvold May 12, 2023
02e0ce0
Return ETag
tustvold Oct 17, 2023
46f2f72
Support list start-after
tustvold Oct 27, 2023
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68 changes: 68 additions & 0 deletions fakestorage/object.go
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Expand Up @@ -13,6 +13,7 @@ import (
"fmt"
"io"
"net/http"
"net/url"
"sort"
"strconv"
"strings"
Expand Down Expand Up @@ -626,6 +627,72 @@ func (s *Server) xmlListObjects(r *http.Request) xmlResponse {
}
}

func (s *Server) xmlPutObject(r *http.Request) xmlResponse {
// https://cloud.google.com/storage/docs/xml-api/put-object-upload
vars := unescapeMuxVars(mux.Vars(r))
defer r.Body.Close()

metaData := make(map[string]string)
for key := range r.Header {
lowerKey := strings.ToLower(key)
if metaDataKey := strings.TrimPrefix(lowerKey, "x-goog-meta-"); metaDataKey != lowerKey {
metaData[metaDataKey] = r.Header.Get(key)
}
}

obj := StreamingObject{
ObjectAttrs: ObjectAttrs{
BucketName: vars["bucketName"],
Name: vars["objectName"],
ContentType: r.Header.Get(contentTypeHeader),
ContentEncoding: r.Header.Get(contentEncodingHeader),
Metadata: metaData,
},
}
if source := r.Header.Get("x-goog-copy-source"); source != "" {
escaped, err := url.PathUnescape(source)
if err != nil {
return xmlResponse{status: http.StatusBadRequest}
}

split := strings.SplitN(escaped, "/", 2)
if len(split) != 2 {
return xmlResponse{status: http.StatusBadRequest}
}

sourceObject, err := s.GetObjectStreaming(split[0], split[1])
if err != nil {
return xmlResponse{status: http.StatusNotFound}
}
obj.Content = sourceObject.Content
} else {
obj.Content = notImplementedSeeker{r.Body}
}

obj, err := s.createObject(obj, backend.NoConditions{})

if err != nil {
return xmlResponse{
status: http.StatusInternalServerError,
errorMessage: err.Error(),
}
}

obj.Close()
return xmlResponse{
status: http.StatusOK,
}
}

func (s *Server) xmlDeleteObject(r *http.Request) xmlResponse {
resp := s.deleteObject(r)
return xmlResponse{
status: resp.status,
errorMessage: resp.errorMessage,
header: resp.header,
}
}

func (s *Server) getObject(w http.ResponseWriter, r *http.Request) {
if alt := r.URL.Query().Get("alt"); alt == "media" || r.Method == http.MethodHead {
s.downloadObject(w, r)
Expand Down Expand Up @@ -867,6 +934,7 @@ func (s *Server) downloadObject(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Goog-Generation", strconv.FormatInt(obj.Generation, 10))
w.Header().Set("X-Goog-Hash", fmt.Sprintf("crc32c=%s,md5=%s", obj.Crc32c, obj.Md5Hash))
w.Header().Set("Last-Modified", obj.Updated.Format(http.TimeFormat))
w.Header().Set("ETag", obj.Etag)
for name, value := range obj.Metadata {
w.Header().Set("X-Goog-Meta-"+name, value)
}
Expand Down
9 changes: 3 additions & 6 deletions fakestorage/server.go
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Expand Up @@ -276,6 +276,9 @@ func (s *Server) buildMuxer() {
for _, r := range xmlApiRouters {
r.Path("/").Methods(http.MethodGet).HandlerFunc(xmlToHTTPHandler(s.xmlListObjects))
r.Path("").Methods(http.MethodGet).HandlerFunc(xmlToHTTPHandler(s.xmlListObjects))
r.Path("/{objectName:.+}").Methods(http.MethodPut).HandlerFunc(xmlToHTTPHandler(s.xmlPutObject))
r.Path("/{objectName:.+}").Methods(http.MethodGet, http.MethodHead).HandlerFunc(s.downloadObject)
r.Path("/{objectName:.+}").Methods(http.MethodDelete).HandlerFunc(xmlToHTTPHandler(s.xmlDeleteObject))
}

bucketHost := fmt.Sprintf("{bucketName}.%s", s.publicHost)
Expand All @@ -296,12 +299,6 @@ func (s *Server) buildMuxer() {
handler.Host(s.publicHost).Path("/{bucketName}").MatcherFunc(matchFormData).Methods(http.MethodPost, http.MethodPut).HandlerFunc(xmlToHTTPHandler(s.insertFormObject))
handler.Host(bucketHost).MatcherFunc(matchFormData).Methods(http.MethodPost, http.MethodPut).HandlerFunc(xmlToHTTPHandler(s.insertFormObject))

// Signed URLs (upload and download)
handler.MatcherFunc(s.publicHostMatcher).Path("/{bucketName}/{objectName:.+}").Methods(http.MethodPost, http.MethodPut).HandlerFunc(jsonToHTTPHandler(s.insertObject))
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This can't have ever worked as insertObject expects query parameters encoding the object name, etc...

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insertObject does not necessarily read the object name from query parameters:

fake-gcs-server/fakestorage/upload.go

Lines 85 to 95 in d7832ec

default:
// Support Signed URL Uploads
if r.URL.Query().Get("X-Goog-Algorithm") != "" {
switch r.Method {
case http.MethodPost:
return s.resumableUpload(bucketName, r)
case http.MethodPut:
return s.signedUpload(bucketName, r)
}
}
return jsonResponse{errorMessage: "invalid uploadType", status: http.StatusBadRequest}

I need to take a deeper look at this, but curious if you're basing on comment on the docs? There are many undocumented things in the GCS API that we run into when someone tries to integrate with some different SDK, and I've ironically done a poor job in documenting those in fake-gcs-server 🙈

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@tustvold tustvold May 12, 2023 •
edited

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Indeed, insertObject has a peculiar special case that uses X-Goog-Algorithm to detect a signed URL and then falls back to implementing something that looks like the XML API, because that is what signed URLs are. With this PR that can probably be removed 🤔

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Yeah, absolutely. insertObject definitely looks like a little monster doing too many things. Thank you very much! I'll go over the PR in details later today.

handler.MatcherFunc(s.publicHostMatcher).Path("/{bucketName}/{objectName:.+}").Methods(http.MethodGet, http.MethodHead).HandlerFunc(s.getObject)
handler.Host(bucketHost).Path("/{objectName:.+}").Methods(http.MethodPost, http.MethodPut).HandlerFunc(jsonToHTTPHandler(s.insertObject))
handler.Host("{bucketName:.+}").Path("/{objectName:.+}").Methods(http.MethodPost, http.MethodPut).HandlerFunc(jsonToHTTPHandler(s.insertObject))

s.handler = handler
}

Expand Down
2 changes: 2 additions & 0 deletions fakestorage/upload.go
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Expand Up @@ -27,6 +27,8 @@ import (

const contentTypeHeader = "Content-Type"

const contentEncodingHeader = "Content-Encoding"

const (
uploadTypeMedia = "media"
uploadTypeMultipart = "multipart"
Expand Down
79 changes: 58 additions & 21 deletions fakestorage/upload_test.go
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Expand Up @@ -10,7 +10,6 @@ import (
"context"
"crypto/tls"
"encoding/binary"
"encoding/json"
"fmt"
"io"
"mime/multipart"
Expand Down Expand Up @@ -570,9 +569,6 @@ func TestServerClientSignedUpload(t *testing.T) {

func TestServerClientSignedUploadBucketCNAME(t *testing.T) {
url := "https://mybucket.mydomain.com:4443/files/txt/text-02.txt?X-Goog-Algorithm=GOOG4-RSA-SHA256&X-Goog-Credential=fake-gcs&X-Goog-Expires=3600&X-Goog-SignedHeaders=host&X-Goog-Signature=fake-gc"
expectedName := "files/txt/text-02.txt"
expectedContentType := "text/plain"
expectedHash := "bHupxaFBQh4cA8uYB8l8dA=="
opts := Options{
InitialObjects: []Object{
{ObjectAttrs: ObjectAttrs{BucketName: "mybucket.mydomain.com", Name: "files/txt/text-01.txt"}, Content: []byte("something")},
Expand All @@ -596,23 +592,6 @@ func TestServerClientSignedUploadBucketCNAME(t *testing.T) {
if resp.StatusCode != http.StatusOK {
t.Errorf("wrong status returned\nwant %d\ngot %d", http.StatusOK, resp.StatusCode)
}
data, err := io.ReadAll(resp.Body)
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This was incorrect, the XML APIs should not return a body and certainly shouldn't return JSON

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🤔 Oh are signed uploads powered by the XML API? Interesting!

if err != nil {
t.Fatal(err)
}
var obj Object
if err := json.Unmarshal(data, &obj); err != nil {
t.Fatal(err)
}
if obj.Name != expectedName {
t.Errorf("wrong filename\nwant %q\ngot %q", expectedName, obj.Name)
}
if obj.ContentType != expectedContentType {
t.Errorf("wrong content type\nwant %q\ngot %q", expectedContentType, obj.ContentType)
}
if obj.Md5Hash != expectedHash {
t.Errorf("wrong md5 hash\nwant %q\ngot %q", expectedHash, obj.Md5Hash)
}
}

func TestServerClientUploadWithPredefinedAclPublicRead(t *testing.T) {
Expand Down Expand Up @@ -700,6 +679,64 @@ func TestServerClientSimpleUploadNoName(t *testing.T) {
}
}

func TestServerXMLPut(t *testing.T) {
server, err := NewServerWithOptions(Options{
PublicHost: "test",
})
if err != nil {
t.Fatal(err)
}
defer server.Stop()
server.CreateBucketWithOpts(CreateBucketOpts{Name: "bucket1"})
server.CreateBucketWithOpts(CreateBucketOpts{Name: "bucket2"})

const data = "some nice content"
req, err := http.NewRequest("PUT", server.URL()+"/bucket1/path", strings.NewReader(data))
req.Host = "test"
if err != nil {
t.Fatal(err)
}
client := http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
},
}
resp, err := client.Do(req)
if err != nil {
t.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
t.Errorf("got %d expected %d", resp.StatusCode, http.StatusOK)
}

req, err = http.NewRequest("PUT", server.URL()+"/bucket2/path", nil)
req.Host = "test"
req.Header.Set("x-goog-copy-source", "bucket1/path")

resp, err = client.Do(req)
if err != nil {
t.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
t.Errorf("got %d expected %d", resp.StatusCode, http.StatusOK)
}

req, err = http.NewRequest("PUT", server.URL()+"/bucket2/path2", nil)
req.Host = "test"
req.Header.Set("x-goog-copy-source", "bucket1/nonexistent")

resp, err = client.Do(req)
if err != nil {
t.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusNotFound {
t.Errorf("got %d expected %d", resp.StatusCode, http.StatusNotFound)
}
}

func TestServerInvalidUploadType(t *testing.T) {
server := NewServer(nil)
defer server.Stop()
Expand Down