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server.go
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server.go
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// Copyright 2017 Francisco Souza. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fakestorage
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/http/httptest"
"sync"
"cloud.google.com/go/storage"
"github.com/fsouza/fake-gcs-server/internal/backend"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"google.golang.org/api/option"
)
// Server is the fake server.
//
// It provides a fake implementation of the Google Cloud Storage API.
type Server struct {
backend backend.Storage
uploads sync.Map
transport http.RoundTripper
ts *httptest.Server
mux *mux.Router
externalURL string
publicHost string
}
// NewServer creates a new instance of the server, pre-loaded with the given
// objects.
func NewServer(objects []Object) *Server {
s, _ := NewServerWithOptions(Options{
InitialObjects: objects,
})
return s
}
// NewServerWithHostPort creates a new server that listens on a custom host and port
//
// Deprecated: use NewServerWithOptions.
func NewServerWithHostPort(objects []Object, host string, port uint16) (*Server, error) {
return NewServerWithOptions(Options{
InitialObjects: objects,
Host: host,
Port: port,
})
}
// Options are used to configure the server on creation.
type Options struct {
InitialObjects []Object
StorageRoot string
Scheme string
Host string
Port uint16
// when set to true, the server will not actually start a TCP listener,
// client requests will get processed by an internal mocked transport.
NoListener bool
// Optional external URL, such as https://gcs.127.0.0.1.nip.io:4443
// Returned in the Location header for resumable uploads
// The "real" value is https://www.googleapis.com, the JSON API
// The default is whatever the server is bound to, such as https://0.0.0.0:4443
ExternalURL string
// Optional URL for public access
// An example is "storage.gcs.127.0.0.1.nip.io:4443", which will configure
// the server to serve objects at:
// https://storage.gcs.127.0.0.1.nip.io:4443/<bucket>/<object>
// https://<bucket>.storage.gcs.127.0.0.1.nip.io:4443>/<bucket>/<object>
// If unset, the default is "storage.googleapis.com", the XML API
PublicHost string
// Optional list of headers to add to the CORS header allowlist
// An example is "X-Goog-Meta-Uploader", which will allow a
// custom metadata header named "X-Goog-Meta-Uploader" to be
// sent through the browser
AllowedCORSHeaders []string
// Destination for writing log.
Writer io.Writer
}
// NewServerWithOptions creates a new server configured according to the
// provided options.
func NewServerWithOptions(options Options) (*Server, error) {
s, err := newServer(options.InitialObjects, options.StorageRoot, options.ExternalURL, options.PublicHost)
if err != nil {
return nil, err
}
if options.NoListener {
s.setTransportToMux()
return s, nil
}
allowedHeaders := []string{"Content-Type", "Content-Encoding", "Range"}
allowedHeaders = append(allowedHeaders, options.AllowedCORSHeaders...)
cors := handlers.CORS(
handlers.AllowedMethods([]string{
http.MethodHead,
http.MethodGet,
http.MethodPost,
http.MethodPut,
http.MethodPatch,
http.MethodDelete,
}),
handlers.AllowedHeaders(allowedHeaders),
handlers.AllowedOrigins([]string{"*"}),
handlers.AllowCredentials(),
)
var handler http.Handler = cors(s.mux)
if options.Writer != nil {
handler = handlers.LoggingHandler(options.Writer, handler)
}
s.ts = httptest.NewUnstartedServer(handler)
startFunc := s.ts.StartTLS
if options.Scheme == "http" {
startFunc = s.ts.Start
}
if options.Port != 0 {
addr := fmt.Sprintf("%s:%d", options.Host, options.Port)
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
s.ts.Listener.Close()
s.ts.Listener = l
}
startFunc()
s.setTransportToAddr(s.ts.Listener.Addr().String())
return s, nil
}
func newServer(objects []Object, storageRoot, externalURL, publicHost string) (*Server, error) {
backendObjects := toBackendObjects(objects)
var backendStorage backend.Storage
var err error
if storageRoot != "" {
backendStorage, err = backend.NewStorageFS(backendObjects, storageRoot)
} else {
backendStorage = backend.NewStorageMemory(backendObjects)
}
if err != nil {
return nil, err
}
if publicHost == "" {
publicHost = "storage.googleapis.com"
}
s := Server{
backend: backendStorage,
uploads: sync.Map{},
externalURL: externalURL,
publicHost: publicHost,
}
s.buildMuxer()
return &s, nil
}
func (s *Server) setTransportToAddr(addr string) {
// #nosec
tlsConfig := tls.Config{InsecureSkipVerify: true}
s.transport = &http.Transport{
TLSClientConfig: &tlsConfig,
DialTLS: func(string, string) (net.Conn, error) {
return tls.Dial("tcp", addr, &tlsConfig)
},
}
}
func (s *Server) setTransportToMux() {
s.transport = &muxTransport{router: s.mux}
}
func (s *Server) buildMuxer() {
const apiPrefix = "/storage/v1"
s.mux = mux.NewRouter()
routers := []*mux.Router{
s.mux.PathPrefix(apiPrefix).Subrouter(),
s.mux.Host(s.publicHost).PathPrefix(apiPrefix).Subrouter(),
}
for _, r := range routers {
r.Path("/b").Methods("GET").HandlerFunc(s.listBuckets)
r.Path("/b").Methods("POST").HandlerFunc(s.createBucketByPost)
r.Path("/b/{bucketName}").Methods("GET").HandlerFunc(s.getBucket)
r.Path("/b/{bucketName}/o").Methods("GET").HandlerFunc(s.listObjects)
r.Path("/b/{bucketName}/o").Methods("POST").HandlerFunc(s.insertObject)
r.Path("/b/{bucketName}/o/{objectName:.+}").Methods("PATCH").HandlerFunc(s.patchObject)
r.Path("/b/{bucketName}/o/{objectName:.+}/acl").Methods("GET").HandlerFunc(s.listObjectACL)
r.Path("/b/{bucketName}/o/{objectName:.+}/acl/{entity}").Methods("PUT").HandlerFunc(s.setObjectACL)
r.Path("/b/{bucketName}/o/{objectName:.+}").Methods("GET").HandlerFunc(s.getObject)
r.Path("/b/{bucketName}/o/{objectName:.+}").Methods("DELETE").HandlerFunc(s.deleteObject)
r.Path("/b/{sourceBucket}/o/{sourceObject:.+}/rewriteTo/b/{destinationBucket}/o/{destinationObject:.+}").HandlerFunc(s.rewriteObject)
}
bucketHost := fmt.Sprintf("{bucketName}.%s", s.publicHost)
s.mux.Host(bucketHost).Path("/{objectName:.+}").Methods("GET", "HEAD").HandlerFunc(s.downloadObject)
s.mux.Path("/download/storage/v1/b/{bucketName}/o/{objectName:.+}").Methods("GET").HandlerFunc(s.downloadObject)
s.mux.Path("/upload/storage/v1/b/{bucketName}/o").Methods("POST").HandlerFunc(s.insertObject)
s.mux.Path("/upload/resumable/{uploadId}").Methods("PUT", "POST").HandlerFunc(s.uploadFileContent)
s.mux.Host(s.publicHost).Path("/{bucketName}/{objectName:.+}").Methods("GET", "HEAD").HandlerFunc(s.downloadObject)
s.mux.Host("{bucketName:.+}").Path("/{objectName:.+}").Methods("GET", "HEAD").HandlerFunc(s.downloadObject)
// Signed URL Uploads
s.mux.Host(s.publicHost).Path("/{bucketName}/{objectName:.+}").Methods("POST", "PUT").HandlerFunc(s.insertObject)
s.mux.Host(bucketHost).Path("/{objectName:.+}").Methods("POST", "PUT").HandlerFunc(s.insertObject)
s.mux.Host("{bucketName:.+}").Path("/{objectName:.+}").Methods("POST", "PUT").HandlerFunc(s.insertObject)
}
// Stop stops the server, closing all connections.
func (s *Server) Stop() {
if s.ts != nil {
if transport, ok := s.transport.(*http.Transport); ok {
transport.CloseIdleConnections()
}
s.ts.Close()
}
}
// URL returns the server URL.
func (s *Server) URL() string {
if s.externalURL != "" {
return s.externalURL
}
if s.ts != nil {
return s.ts.URL
}
return ""
}
// PublicURL returns the server's public download URL.
func (s *Server) PublicURL() string {
return fmt.Sprintf("https://%s", s.publicHost)
}
// HTTPClient returns an HTTP client configured to talk to the server.
func (s *Server) HTTPClient() *http.Client {
return &http.Client{Transport: s.transport}
}
// Client returns a GCS client configured to talk to the server.
func (s *Server) Client() *storage.Client {
opt := option.WithHTTPClient(s.HTTPClient())
client, _ := storage.NewClient(context.Background(), opt)
return client
}