From 02b304098400a00cd3751b81beb4ef99cb1a6c76 Mon Sep 17 00:00:00 2001 From: Tyler Bui-Palsulich Date: Mon, 9 Sep 2019 08:00:37 -0400 Subject: [PATCH] all: initial commit --- CONTRIBUTING.md | 28 +++++++ LICENSE | 202 +++++++++++++++++++++++++++++++++++++++++++++ README.md | 10 +++ go.mod | 11 +++ go.sum | 129 +++++++++++++++++++++++++++++ store.go | 211 ++++++++++++++++++++++++++++++++++++++++++++++++ store_test.go | 149 ++++++++++++++++++++++++++++++++++ 7 files changed, 740 insertions(+) create mode 100644 CONTRIBUTING.md create mode 100644 LICENSE create mode 100644 README.md create mode 100644 go.mod create mode 100644 go.sum create mode 100644 store.go create mode 100644 store_test.go diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md new file mode 100644 index 0000000..ae4e043 --- /dev/null +++ b/CONTRIBUTING.md @@ -0,0 +1,28 @@ +# How to Contribute + +We'd love to accept your patches and contributions to this project. There are +just a few small guidelines you need to follow. + +## Contributor License Agreement + +Contributions to this project must be accompanied by a Contributor License +Agreement. You (or your employer) retain the copyright to your contribution; +this simply gives us permission to use and redistribute your contributions as +part of the project. Head over to to see +your current agreements on file or to sign a new one. + +You generally only need to submit a CLA once, so if you've already submitted one +(even if it was for a different project), you probably don't need to do it +again. + +## Code reviews + +All submissions, including submissions by project members, require review. We +use GitHub pull requests for this purpose. Consult +[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more +information on using pull requests. + +## Community Guidelines + +This project follows [Google's Open Source Community +Guidelines](https://opensource.google.com/conduct/). \ No newline at end of file diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..7a4a3ea --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..bce87d3 --- /dev/null +++ b/README.md @@ -0,0 +1,10 @@ +# Firestore Gorilla + +This project contains a +[`gorilla/sessions.Store`](https://www.gorillatoolkit.org/pkg/sessions#Store) +implementation backed by Firestore. + +Disclaimer +---------- + +This is not an officially supported Google product. diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..6b64aee --- /dev/null +++ b/go.mod @@ -0,0 +1,11 @@ +module github.com/GoogleCloudPlatform/firestore-gorilla-sessions + +go 1.11 + +require ( + cloud.google.com/go v0.44.3 + github.com/google/go-cmp v0.3.1 + github.com/gorilla/sessions v1.2.0 + google.golang.org/api v0.9.0 + google.golang.org/grpc v1.23.0 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..de7df86 --- /dev/null +++ b/go.sum @@ -0,0 +1,129 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod 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under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// Package firestoregorilla is a Firestore-backed sessions store, which can be +// used with gorilla/sessions. +// +// Encoded sessions are stored in Firestore and session IDs are stored in +// secure cookies. +// +// Sessions never expire and are never deleted or cleaned up. +package firestoregorilla + +import ( + "context" + "encoding/json" + "fmt" + "net/http" + + "cloud.google.com/go/firestore" + "github.com/gorilla/sessions" + "google.golang.org/grpc/codes" + "google.golang.org/grpc/status" +) + +// maxLength is the maximum length of an encoded session that can be stored +// in a Store. See https://firebase.google.com/docs/firestore/quotas. +const maxLength = 2 << 20 + +// Store is a Firestore-backed sessions store. +type Store struct { + client *firestore.Client +} + +var _ sessions.Store = &Store{} + +// sessionDoc wraps an encoded session so it can be saved as a Firestore +// document. +type sessionDoc struct { + EncodedSession string +} + +// New creates a new Store. +// +// Only string key values are supported for sessions. +func New(ctx context.Context, client *firestore.Client) (*Store, error) { + return &Store{ + client: client, + }, nil +} + +// Get returns a cached session, if it exists. Otherwise, Get returns a new +// session. +// +// The name is used as the cookie name and Firestore collection name, so +// different apps in the same Google Cloud project should use different names. +func (s *Store) Get(r *http.Request, name string) (*sessions.Session, error) { + return sessions.GetRegistry(r).Get(s, name) +} + +// New creates and returns a new session. +// +// If the session already exists, it will be returned. +// +// The name is used as the cookie name and Firestore collection name, so +// different apps in the same Google Cloud project should use different names. +func (s *Store) New(r *http.Request, name string) (*sessions.Session, error) { + session := sessions.NewSession(s, name) + + // Ignore errors in case the cookie isn't set yet. + id, _ := s.readIDFromCookie(r, name) + if id == "" { + // No ID in the cookie means the session is new. + session.IsNew = true + return session, nil + } + + // ID found, check if the session already exists. + ds, err := s.client.Collection(name).Doc(id).Get(r.Context()) + if status.Code(err) == codes.NotFound { + // A NotFound error means the session is new. + session.IsNew = true + return session, nil + } + if err != nil { + return session, fmt.Errorf("Get: %v", err) + } + + // The session was found, get it. + encoded := sessionDoc{} + if err := ds.DataTo(&encoded); err != nil { + return session, fmt.Errorf("DataTo: %v", err) + } + cachedSession, err := s.deserialize(encoded.EncodedSession) + if err != nil { + return session, err + } + session.ID = cachedSession.ID + session.Values = cachedSession.Values + session.Options = cachedSession.Options + session.IsNew = false + + return session, nil +} + +// Save persists the session to Firestore and the session ID in a cookie. +func (s *Store) Save(r *http.Request, w http.ResponseWriter, session *sessions.Session) error { + id := session.ID + if id == "" { + // Ignore errors in case the cookie isn't set yet. + id, _ = s.readIDFromCookie(r, session.Name()) + } + if id == "" { + id = s.client.Collection(session.Name()).NewDoc().ID + } + + session.ID = id + sessionString, err := s.serialize(session) + if err != nil { + return err + } + encoded := sessionDoc{EncodedSession: sessionString} + + if _, err := s.client.Collection(session.Name()).Doc(id).Set(r.Context(), encoded); err != nil { + return fmt.Errorf("Create: %v", err) + } + + s.saveIDInCookie(w, session.Name(), id) + + return nil +} + +// readIDFromCookie gets the ID stored int the cookie, if it exists. +// It returns an error if the cookie is not set. +func (s *Store) readIDFromCookie(r *http.Request, name string) (string, error) { + c, err := r.Cookie(name) + if err != nil { + return "", fmt.Errorf("Cookie: %v", err) + } + return c.Value, nil +} + +// saveIDInCookie saves the ID in a cookie. +func (s *Store) saveIDInCookie(w http.ResponseWriter, name, id string) { + cookie := &http.Cookie{ + Name: name, + Value: id, + } + http.SetCookie(w, cookie) +} + +// jsonSession is an encoding/json compatible version of sessions.Session. +type jsonSession struct { + Values map[string]interface{} + ID string + Options *sessions.Options +} + +// serialize serializes the session into a JSON string. Only string key values +// are supported. encoding/gob could be used to support non-string keys, but it +// is slower and leads to larger sessions. +func (s *Store) serialize(session *sessions.Session) (string, error) { + values := map[string]interface{}{} + for k, v := range session.Values { + ks, ok := k.(string) + if !ok { + return "", fmt.Errorf("only string keys supported: %v", k) + } + values[ks] = v + } + jSession := jsonSession{ + Values: values, + ID: session.ID, + Options: session.Options, + } + b, err := json.Marshal(jSession) + if err != nil { + return "", fmt.Errorf("json.Marshal: %v", err) + } + if len(b) > maxLength { + return "", fmt.Errorf("max length of session exceeded: %d > %d", len(b), maxLength) + } + return string(b), nil +} + +// deserialize decodes a session. +func (*Store) deserialize(s string) (*sessions.Session, error) { + jSession := jsonSession{} + if err := json.Unmarshal([]byte(s), &jSession); err != nil { + return nil, fmt.Errorf("json.Unmarshal: %v", err) + } + values := map[interface{}]interface{}{} + for k, v := range jSession.Values { + values[k] = v + } + return &sessions.Session{ + Values: values, + ID: jSession.ID, + Options: jSession.Options, + }, nil +} diff --git a/store_test.go b/store_test.go new file mode 100644 index 0000000..c21979a --- /dev/null +++ b/store_test.go @@ -0,0 +1,149 @@ +// Copyright 2019 Google LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package firestoregorilla + +import ( + "context" + "net/http" + "net/http/httptest" + "os" + "strings" + "testing" + + "cloud.google.com/go/firestore" + "github.com/google/go-cmp/cmp" + "google.golang.org/api/iterator" +) + +func TestStore(t *testing.T) { + projectID := os.Getenv("GOOGLE_CLOUD_PROJECT") + if projectID == "" { + t.Skip("GOOGLE_CLOUD_PROJECT not set") + } + ctx := context.Background() + + client, err := firestore.NewClient(ctx, projectID) + if err != nil { + t.Fatalf("firestore.NewClient: %v", err) + } + defer client.Close() + + s, err := New(ctx, client) + + r := httptest.NewRequest("GET", "/", nil) + const name = "testname" + session, err := s.New(r, name) + if err != nil { + t.Errorf("New: %v", err) + } + defer s.cleanup(name) + + session.Values["testkey"] = "testvalue" + + rr := httptest.NewRecorder() + if err := s.Save(r, rr, session); err != nil { + t.Errorf("Save: %v", err) + } + + // Subsequent requests include the cookie. + r.Header.Set("Cookie", rr.Header().Get("Set-Cookie")) + + got, err := s.Get(r, name) + if err != nil { + t.Errorf("Get: %v", err) + } + if !cmp.Equal(session.Values, got.Values) { + t.Errorf("Get got a session with diff Values (-want, +got):\n%s", cmp.Diff(session.Values, got.Values)) + } + if got.IsNew { + t.Errorf("Get got IsNew=true, want false") + } + + cachedSession, err := s.New(r, name) + if err != nil { + t.Fatalf("New cachedSession: %v", err) + } + if !cmp.Equal(session.Values, cachedSession.Values) { + t.Errorf("Get got a session with diff Values (-want, +got):\n%s", cmp.Diff(session.Values, cachedSession.Values)) + } + if cachedSession.IsNew { + t.Errorf("New got cachedSession.IsNew=true, want false") + } +} + +func TestMaxLength(t *testing.T) { + projectID := os.Getenv("GOOGLE_CLOUD_PROJECT") + if projectID == "" { + t.Skip("GOOGLE_CLOUD_PROJECT not set") + } + ctx := context.Background() + + client, err := firestore.NewClient(ctx, projectID) + if err != nil { + t.Fatalf("firestore.NewClient: %v", err) + } + defer client.Close() + + s, err := New(ctx, client) + if err != nil { + t.Fatalf("New: %v", err) + } + + r := &http.Request{} + + const name = "TestMaxLength" + session, err := s.New(r, name) + if err != nil { + t.Fatalf("New: %v", err) + } + defer s.cleanup(name) + + if _, err := s.serialize(session); err != nil { + t.Errorf("serialize(%+v) want nil error, got %v", session, err) + } + + bigSession, err := s.New(r, name) + if err != nil { + t.Fatalf("New: %v", err) + } + // Ensure bigSession is over maxLength. + bigSession.Values["store"] = strings.Repeat("firestore", 1<<20) + + sessionStr, err := s.serialize(bigSession) + if err == nil { + t.Fatalf("serialize(bigSession) want max length error, got nil error\n\tgot=%d bytes, maxLenth=%d bytes", len([]byte(sessionStr)), maxLength) + } + // Confirm the error was about the max length, not something else like gob + // encoding. + if want := "max length"; !strings.Contains(err.Error(), want) { + t.Errorf("serialize(bigSession) got err %q, want to contain %q", err.Error(), want) + } +} + +// cleanup deletes every document in the name collection. +func (s *Store) cleanup(name string) { + iter := s.client.Collection(name).DocumentRefs(context.Background()) + for { + doc, err := iter.Next() + if err == iterator.Done { + break + } + if err != nil { + // Ignore. + } + // Ignore errors. + doc.Delete(context.Background()) + } +}