diff --git a/.gcloudignore b/.gcloudignore new file mode 100644 index 0000000..199e6d9 --- /dev/null +++ b/.gcloudignore @@ -0,0 +1,25 @@ +# This file specifies files that are *not* uploaded to Google Cloud Platform +# using gcloud. It follows the same syntax as .gitignore, with the addition of +# "#!include" directives (which insert the entries of the given .gitignore-style +# file at that point). +# +# For more information, run: +# $ gcloud topic gcloudignore +# +.gcloudignore +# If you would like to upload your .git directory, .gitignore file or files +# from your .gitignore file, remove the corresponding line +# below: +.git +.gitignore + +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib +# Test binary, build with `go test -c` +*.test +# Output of the go coverage tool, specifically when used with LiteIDE +*.out \ No newline at end of file diff --git a/README.md b/README.md index a213a88..9ebd040 100644 --- a/README.md +++ b/README.md @@ -16,12 +16,14 @@ appropriately to the (relatively few) needed JSON API calls. The TiddlyWeb JSON API envisions a multiuser system in which different users have access to different sets of tiddlers. This Go server contains none of that: it assumes that all users have full access to everything, although it does record -who created which tiddlers. The only access control is that the app.yaml here -requires HTTPS and administrator login for all URLs, and as a “belt and suspenders” measure, -the app itself also refuses to serve to non-admins, as checked by user.IsAdmin. +who created which tiddlers. -See the "Re Authentication" comment in tiddly.go for information about -making the server publicly read-only (it's not quite perfect). +Authentication is controlled by [Google IAP][iap] as a “belt and suspenders” +measure. When deploying the application you will need to enable and [configure +IAP][configure-iap] with the addresses you want to have access. + +[iap]: https://cloud.google.com/go/getting-started/authenticate-users-with-iap +[configure-iap]: https://cloud.google.com/go/getting-started/authenticate-users-with-iap#enable-cloud-iap ## Data model @@ -40,11 +42,18 @@ tiddler content on demand. Create an Google App Engine standard app and deploy with - appcfg.py -A your-app -V your-version update . + gcloud --project=your-app app deploy Then visit https://your-app.appspot.com/. As noted above, only admins will have access to the content. +## Backup + +There is an optional service called [`gitbackup`][gitbackup] that can backup +the TiddlyWiki datastore to git periodically. + +[gitbackup]: https://github.com/philips/tiddly/tree/master/gitbackup + ## Plugins TiddlyWiki supports extension through plugins. @@ -97,4 +106,3 @@ The process for preparing a new index.html is: - Open the downloaded file in the web browser. - Repeat, adding any more plugins. - Copy the final download to index.html. - diff --git a/app.yaml b/app.yaml index 89f56fe..9b101f0 100644 --- a/app.yaml +++ b/app.yaml @@ -1,10 +1,7 @@ -application: tiddlywiki-gae -version: 2016-12-22 -runtime: go -api_version: go1 +# cannot update to go113 because of https://stackoverflow.com/questions/56249339/what-is-the-correct-context-for-appengine-taskqueue-in-go112-standard-runtime +runtime: go111 handlers: - url: /.* - login: admin secure: always - script: _go_app + script: auto diff --git a/gitbackup/.gcloudignore b/gitbackup/.gcloudignore new file mode 100644 index 0000000..199e6d9 --- /dev/null +++ b/gitbackup/.gcloudignore @@ -0,0 +1,25 @@ +# This file specifies files that are *not* uploaded to Google Cloud Platform +# using gcloud. It follows the same syntax as .gitignore, with the addition of +# "#!include" directives (which insert the entries of the given .gitignore-style +# file at that point). +# +# For more information, run: +# $ gcloud topic gcloudignore +# +.gcloudignore +# If you would like to upload your .git directory, .gitignore file or files +# from your .gitignore file, remove the corresponding line +# below: +.git +.gitignore + +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib +# Test binary, build with `go test -c` +*.test +# Output of the go coverage tool, specifically when used with LiteIDE +*.out \ No newline at end of file diff --git a/gitbackup/.gitignore b/gitbackup/.gitignore new file mode 100644 index 0000000..1354cb4 --- /dev/null +++ b/gitbackup/.gitignore @@ -0,0 +1 @@ +app.yaml diff --git a/gitbackup/README.md b/gitbackup/README.md new file mode 100644 index 0000000..2c3e7c2 --- /dev/null +++ b/gitbackup/README.md @@ -0,0 +1,34 @@ +## Tiddly Git Backup + +This is a simple Google App Engine app that will backup the Tiddly datastore to +a git repo. + +The intention of this system is to have a safe automatic backup of your +TiddlyWiki and also to enable automated generation of [static +sites][static]. + +[static]: https://tiddlywiki.com/static/Generating%2520Static%2520Sites%2520with%2520TiddlyWiki.html + +### Configuration + +Copy `app.yaml.example` to `app.yaml` and configure the environment variables. + +- `GITHTTP_USERNAME` usually your github username +- `GITHTTP_PASSWORD` usually a github personal access token secret key with `repo` access +- `GITHTTP_URL` usually a HTTPS URL to a github repo + +If you want to publish your Tiddlers via a static site host like GitHub or Netlify [fork from this repo](https://github.com/philips/tiddlypublish) + +### Deploy + +Deploy this service into the same Google Cloud project you deploy tiddly into. + +``` +gcloud --project YOUR_PROJECT app deploy +``` + +And deploy the cron job: + +``` +gcloud app deploy cron.yaml +``` diff --git a/gitbackup/app.yaml.example b/gitbackup/app.yaml.example new file mode 100644 index 0000000..4c0fc2b --- /dev/null +++ b/gitbackup/app.yaml.example @@ -0,0 +1,13 @@ +# cannot update to go113 because of https://stackoverflow.com/questions/56249339/what-is-the-correct-context-for-appengine-taskqueue-in-go112-standard-runtime +runtime: go111 +service: gitbackup + +handlers: +- url: /.* + secure: always + script: auto + +env_variables: + GITHTTP_USERNAME: "example" + GITHTTP_PASSWORD: "example" + GITHTTP_URL: "https://example.com/test" diff --git a/gitbackup/cron.yaml b/gitbackup/cron.yaml new file mode 100644 index 0000000..fc13bf1 --- /dev/null +++ b/gitbackup/cron.yaml @@ -0,0 +1,8 @@ +cron: +- description: "backup to git" + url: / + target: gitbackup + schedule: every 10 mins + retry_parameters: + min_backoff_seconds: 2.5 + max_doublings: 5 diff --git a/gitbackup/gitbackup.go b/gitbackup/gitbackup.go new file mode 100644 index 0000000..26a3eef --- /dev/null +++ b/gitbackup/gitbackup.go @@ -0,0 +1,253 @@ +package main + +import ( + "bytes" + "context" + "encoding/json" + "fmt" + "io/ioutil" + "log" + "net/http" + "os" + "path/filepath" + "sort" + "sync" + "time" + + "github.com/go-git/go-git/v5" + "github.com/go-git/go-git/v5/plumbing/object" + "github.com/go-git/go-git/v5/plumbing/transport" + githttp "github.com/go-git/go-git/v5/plumbing/transport/http" + "google.golang.org/appengine" + "google.golang.org/appengine/datastore" +) + +const prefix = "/tmp/gitbackup" + +type Tiddler struct { + Rev int `datastore:"Rev,noindex"` + Meta string `datastore:"Meta,noindex"` + Text string `datastore:"Text,noindex"` + Tags []string `datastore:"Tags,noindex"` +} + +var gd struct { + repo git.Repository + wt *git.Worktree + auth transport.AuthMethod +} + +var mux sync.Mutex + +func gitClone(url string, dir string) error { + fmt.Printf("git clone %s %s --recursive\n", url, dir) + r, err := git.PlainClone(dir, false, &git.CloneOptions{ + Auth: gd.auth, + URL: url, + RecurseSubmodules: git.DefaultSubmoduleRecursionDepth, + }) + if err != nil { + return err + } + + gd.repo = *r + + ref, err := gd.repo.Head() + if err != nil { + return err + } + + _, err = gd.repo.CommitObject(ref.Hash()) + if err != nil { + return err + } + + w, err := gd.repo.Worktree() + if err != nil { + return err + } + + gd.wt = w + + return nil +} + +func gitCommit(ctx context.Context) error { + err := gd.wt.AddGlob("tiddlers/*") + if err != nil { + return err + } + + status, err := gd.wt.Status() + if err != nil { + return err + } + + // Don't commit and push if nothing changed + if status.IsClean() { + return nil + } + + co, err := gd.wt.Commit("updates", &git.CommitOptions{ + Author: &object.Signature{ + Name: "TiddlyWiki Git Backup", + Email: "none@example.com", + When: time.Now(), + }, + }) + + if err != nil { + return err + } + + fmt.Println(status) + obj, err := gd.repo.CommitObject(co) + if err != nil { + return err + } + + fmt.Println(obj) + + fmt.Printf("git push\n") + // push using default options + err = gd.repo.Push(&git.PushOptions{ + Auth: gd.auth, + }) + if err != nil { + return err + } + + return nil +} + +func main() { + var err error + gituser := os.Getenv("GITHTTP_USERNAME") + gitpass := os.Getenv("GITHTTP_PASSWORD") + giturl := os.Getenv("GITHTTP_URL") + + if giturl == "" || gituser == "" || gitpass == "" { + fmt.Printf("environment variables GITHTTP_USERNAME and GITHTTP_PASSWORD must be set\n") + os.Exit(1) + } + + gd.auth = &githttp.BasicAuth{ + Username: gituser, + Password: gitpass, + } + + err = gitClone(giturl, prefix) + if err != nil { + panic(err) + } + + http.HandleFunc("/", index) + port := os.Getenv("PORT") + if port == "" { + port = "8080" + log.Printf("Defaulting to port %s", port) + } + + appengine.Main() + + log.Printf("Listening on port %s", port) + if err := http.ListenAndServe(":"+port, nil); err != nil { + log.Fatal(err) + } + +} + +func index(w http.ResponseWriter, r *http.Request) { + if r.Method != "GET" { + http.Error(w, "bad method", 405) + return + } + + // only one go routine editing git repo at once + mux.Lock() + defer mux.Unlock() + + ctx := appengine.NewContext(r) + q := datastore.NewQuery("Tiddler") + // Only need Meta, but get no results if we do this. + if false { + q = q.Project("Meta") + } + it := q.Run(ctx) + + dir := filepath.Join(prefix, "tiddlers") + err := gd.wt.RemoveGlob("tiddlers/*") + if err != nil { + println("ERR", err.Error()) + http.Error(w, err.Error(), 500) + return + } + os.RemoveAll(dir) + err = os.MkdirAll(dir, 0755) + if err != nil { + println("ERR", err.Error()) + http.Error(w, err.Error(), 500) + return + } + + for { + var t Tiddler + _, err := it.Next(&t) + if err != nil { + if err == datastore.Done { + break + } + println("ERR", err.Error()) + http.Error(w, err.Error(), 500) + return + } + if len(t.Meta) == 0 { + continue + } + + var buf bytes.Buffer + var js map[string]interface{} + + err = json.Unmarshal([]byte(t.Meta), &js) + if err != nil { + println("ERR cannot unmarshal") + continue + } + + // Sort keys to ensure file stability for git + mk := make([]string, 0, len(js)) + for k := range js { + mk = append(mk, k) + } + sort.Strings(mk) + + for _, k := range mk { + if k == "fields" { + continue + } + if k == "tags" { + tags := js[k].([]interface{}) + if len(tags) == 0 { + continue + } + var t string + sep := "" + for _, v := range tags { + t = t + sep + v.(string) + sep = " " + } + js[k] = t + } + buf.Write([]byte(fmt.Sprintf("%s: %v\n", k, js[k]))) + } + + buf.Write([]byte("\n")) + + buf.Write([]byte(t.Text)) + err = ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("%v.tid", js["title"])), buf.Bytes(), 0644) + } + + gitCommit(ctx) + + fmt.Fprintf(w, "OK\n") +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..803fb67 --- /dev/null +++ b/go.mod @@ -0,0 +1,15 @@ +module rsc.io/tiddly + +go 1.14 + +require ( + cloud.google.com/go v0.57.0 + github.com/dgrijalva/jwt-go v3.2.0+incompatible + github.com/go-git/go-git v4.7.0+incompatible + github.com/go-git/go-git/v5 v5.1.0 + golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9 // indirect + golang.org/x/net v0.0.0-20200602114024-627f9648deb9 // indirect + golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980 // indirect + google.golang.org/appengine v1.6.6 + gopkg.in/src-d/go-git.v4 v4.13.1 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..27464ce --- /dev/null +++ b/go.sum @@ -0,0 +1,358 @@ +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 h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go 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+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= +rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= +rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= diff --git a/googleiap.go b/googleiap.go new file mode 100644 index 0000000..2c8aa62 --- /dev/null +++ b/googleiap.go @@ -0,0 +1,138 @@ +// 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 main + +import ( + "encoding/json" + "fmt" + "log" + "net/http" + "time" + + "cloud.google.com/go/compute/metadata" + "github.com/dgrijalva/jwt-go" +) + +// the functions in this file are copied, with light modification to fit this +// application, from Google's IAP example application: +// https://raw.githubusercontent.com/GoogleCloudPlatform/golang-samples/95634648f8e9140844db8af8244130491457e251/getting-started/authenticating-users/main.go + +// iap holds the Cloud IAP certificates and audience field for this app, which +// are needed to verify authentication headers set by Cloud IAP. +type iap struct { + certs map[string]string + aud string +} + +// newIAP creates a new iap, returning an error if either the Cloud IAP +// certificates or audience field cannot be obtained. +func newIAP() (*iap, error) { + certs, err := certificates() + if err != nil { + return nil, err + } + + aud, err := audience() + if err != nil { + return nil, err + } + + a := &iap{ + certs: certs, + aud: aud, + } + return a, nil +} + +func (i *iap) Email(r *http.Request) string { + assertion := r.Header.Get("X-Goog-IAP-JWT-Assertion") + if assertion == "" { + log.Fatal("No Cloud IAP header found.") + return "" + } + + email, _, err := validateAssertion(assertion, i.certs, i.aud) + if err != nil { + log.Fatalf("Could not validate assertion: %s", assertion) + return "" + } + + return email +} + +// audience returns the expected audience value for this service. +func audience() (string, error) { + projectNumber, err := metadata.NumericProjectID() + if err != nil { + return "", fmt.Errorf("metadata.NumericProjectID: %v", err) + } + + projectID, err := metadata.ProjectID() + if err != nil { + return "", fmt.Errorf("metadata.ProjectID: %v", err) + } + + return "/projects/" + projectNumber + "/apps/" + projectID, nil +} + +// certificates returns Cloud IAP's cryptographic public keys. +func certificates() (map[string]string, error) { + const url = "https://www.gstatic.com/iap/verify/public_key" + client := http.Client{ + Timeout: 5 * time.Second, + } + resp, err := client.Get(url) + if err != nil { + return nil, fmt.Errorf("Get: %v", err) + } + + var certs map[string]string + dec := json.NewDecoder(resp.Body) + if err := dec.Decode(&certs); err != nil { + return nil, fmt.Errorf("Decode: %v", err) + } + + return certs, nil +} + +// validateAssertion validates assertion was signed by Google and returns the +// associated email and userID. +func validateAssertion(assertion string, certs map[string]string, aud string) (email string, userID string, err error) { + token, err := jwt.Parse(assertion, func(token *jwt.Token) (interface{}, error) { + keyID := token.Header["kid"].(string) + + _, ok := token.Method.(*jwt.SigningMethodECDSA) + if !ok { + return nil, fmt.Errorf("unexpected signing method: %q", token.Header["alg"]) + } + + cert := certs[keyID] + return jwt.ParseECPublicKeyFromPEM([]byte(cert)) + }) + + if err != nil { + return "", "", err + } + + claims, ok := token.Claims.(jwt.MapClaims) + if !ok { + return "", "", fmt.Errorf("could not extract claims (%T): %+v", token.Claims, token.Claims) + } + + if claims["aud"].(string) != aud { + return "", "", fmt.Errorf("mismatched audience. aud field %q does not match %q", claims["aud"], aud) + } + return claims["email"].(string), claims["sub"].(string), nil +} diff --git a/tiddly.go b/tiddly.go index 3803576..0b3b0e3 100644 --- a/tiddly.go +++ b/tiddly.go @@ -2,7 +2,7 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -package tiddly +package main import ( "bytes" @@ -10,62 +10,17 @@ import ( "encoding/json" "fmt" "io/ioutil" + "log" "net/http" "net/url" + "os" "strings" "google.golang.org/appengine" "google.golang.org/appengine/datastore" - "google.golang.org/appengine/user" ) -// Re Authentication -// -// There are currently three redundant layers of authentication checks here. -// -// 1. app.yaml says 'login: admin'. -// 2. The installed handlers are wrapped in authCheck during registration in func init. -// 3. The write operations contain an extra mustBeAdmin check. -// -// The redundancy is mainly cautionary, to contain accidents. -// -// It should be possible to make a world-readable, admin-writable TiddlyWiki -// by removing 1 and 2 and double-checking 3. -// -// If you remove 'login: admin' from app.yaml you can replace it with 'login: required', -// requiring a login from any viewer, or you can delete the line entirely, -// making it possible to fetch pages with no authentication. -// In that case, users who do have write access (admins) will need to take the extra -// step of logging in. One way to do this is to make the /auth URL require login -// and have them start there when visiting, by listing that separately in app.yaml -// before the default handler: -// -// handlers: -// - url: /auth -// login: admin -// secure: always -// script: _go_app -// -// - url: /.* -// secure: always -// script: _go_app -// -// If you do this, then unauthenticated users will be able to read content, -// and TiddlyWiki will let them edit content in their browser, but writes back -// to the server will fail, producing yellow pop-up error messages in the -// browser window. In general these are probably good, but this includes -// attempts to update $:/StoryList, which happens as viewers click around -// in the wiki. It seems like the TiddlyWeb plugin or the core syncer module -// would need changes to understand a new "read-only" mode. - -func init() { - http.HandleFunc("/", authCheck(main)) - http.HandleFunc("/auth", authCheck(auth)) - http.HandleFunc("/status", authCheck(status)) - http.HandleFunc("/recipes/all/tiddlers/", authCheck(tiddler)) - http.HandleFunc("/recipes/all/tiddlers.json", authCheck(tiddlerList)) - http.HandleFunc("/bags/bag/tiddlers/", authCheck(deleteTiddler)) -} +var tiddlyIAP *iap func authCheck(f http.HandlerFunc) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { @@ -77,22 +32,48 @@ func authCheck(f http.HandlerFunc) http.HandlerFunc { } func mustBeAdmin(w http.ResponseWriter, r *http.Request) bool { - ctx := appengine.NewContext(r) - u := user.Current(ctx) - if u == nil || !user.IsAdmin(ctx) { - http.Error(w, "permission denied", 403) + if tiddlyIAP.Email(r) == "" { return false } return true } type Tiddler struct { - Rev int `datastore:"Rev,noindex"` - Meta string `datastore:"Meta,noindex"` - Text string `datastore:"Text,noindex"` + Rev int `datastore:"Rev,noindex"` + Meta string `datastore:"Meta,noindex"` + Text string `datastore:"Text,noindex"` + Tags []string `datastore:"Tags,noindex"` } -func main(w http.ResponseWriter, r *http.Request) { +func main() { + var err error + tiddlyIAP, err = newIAP() + if err != nil { + log.Fatal(err) + } + + http.HandleFunc("/", authCheck(index)) + http.HandleFunc("/auth", authCheck(auth)) + http.HandleFunc("/status", authCheck(status)) + http.HandleFunc("/recipes/all/tiddlers/", authCheck(tiddler)) + http.HandleFunc("/recipes/all/tiddlers.json", authCheck(tiddlerList)) + http.HandleFunc("/bags/bag/tiddlers/", authCheck(deleteTiddler)) + + port := os.Getenv("PORT") + if port == "" { + port = "8080" + log.Printf("Defaulting to port %s", port) + } + + appengine.Main() + + log.Printf("Listening on port %s", port) + if err := http.ListenAndServe(":"+port, nil); err != nil { + log.Fatal(err) + } +} + +func index(w http.ResponseWriter, r *http.Request) { if r.Method != "GET" { http.Error(w, "bad method", 405) return @@ -106,12 +87,7 @@ func main(w http.ResponseWriter, r *http.Request) { } func auth(w http.ResponseWriter, r *http.Request) { - ctx := appengine.NewContext(r) - u := user.Current(ctx) - name := "GUEST" - if u != nil { - name = u.String() - } + name := tiddlyIAP.Email(r) fmt.Fprintf(w, "\nYou are logged in as %s.\n\nMain page.\n", name) } @@ -120,13 +96,8 @@ func status(w http.ResponseWriter, r *http.Request) { http.Error(w, "bad method", 405) return } - ctx := appengine.NewContext(r) w.Header().Set("Content-Type", "application/json") - u := user.Current(ctx) - name := "GUEST" - if u != nil { - name = u.String() - } + name := tiddlyIAP.Email(r) w.Write([]byte(`{"username": "` + name + `", "space": {"recipe": "all"}}`)) }