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tiddly.go
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tiddly
import (
"bytes"
"crypto/md5"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"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))
}
func authCheck(f http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !mustBeAdmin(w, r) {
return
}
f(w, r)
}
}
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)
return false
}
return true
}
type Tiddler struct {
Rev int `datastore:"Rev,noindex"`
Meta string `datastore:"Meta,noindex"`
Text string `datastore:"Text,noindex"`
}
func main(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "bad method", 405)
return
}
if r.URL.Path != "/" {
http.Error(w, "not found", 404)
return
}
http.ServeFile(w, r, "index.html")
}
func auth(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
u := user.Current(ctx)
name := "GUEST"
if u != nil {
name = u.String()
}
fmt.Fprintf(w, "<html>\nYou are logged in as %s.\n\n<a href=\"/\">Main page</a>.\n", name)
}
func status(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
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()
}
w.Write([]byte(`{"username": "` + name + `", "space": {"recipe": "all"}}`))
}
func tiddlerList(w http.ResponseWriter, r *http.Request) {
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)
var buf bytes.Buffer
sep := ""
buf.WriteString("[")
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
}
meta := t.Meta
// Tiddlers containing macros don't take effect until
// they are loaded. Force them to be loaded by including
// their bodies in the skinny tiddler list.
// Might need to expand this to other kinds of tiddlers
// in the future as we discover them.
if strings.Contains(meta, `"$:/tags/Macro"`) {
var js map[string]interface{}
err := json.Unmarshal([]byte(meta), &js)
if err != nil {
continue
}
js["text"] = string(t.Text)
data, err := json.Marshal(js)
if err != nil {
continue
}
meta = string(data)
}
buf.WriteString(sep)
sep = ","
buf.WriteString(meta)
}
buf.WriteString("]")
w.Header().Set("Content-Type", "application/json")
w.Write(buf.Bytes())
}
func tiddler(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "GET":
getTiddler(w, r)
case "PUT":
putTiddler(w, r)
default:
http.Error(w, "bad method", 405)
}
}
func getTiddler(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
title := strings.TrimPrefix(r.URL.Path, "/recipes/all/tiddlers/")
key := datastore.NewKey(ctx, "Tiddler", title, 0, nil)
var t Tiddler
if err := datastore.Get(ctx, key, &t); err != nil {
http.Error(w, err.Error(), 500)
return
}
var js map[string]interface{}
err := json.Unmarshal([]byte(t.Meta), &js)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
js["text"] = string(t.Text)
data, err := json.Marshal(js)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(data)
}
func putTiddler(w http.ResponseWriter, r *http.Request) {
if !mustBeAdmin(w, r) {
return
}
ctx := appengine.NewContext(r)
title := strings.TrimPrefix(r.URL.Path, "/recipes/all/tiddlers/")
key := datastore.NewKey(ctx, "Tiddler", title, 0, nil)
data, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "cannot read data", 400)
return
}
var js map[string]interface{}
err = json.Unmarshal(data, &js)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
js["bag"] = "bag"
rev := 1
var old Tiddler
if err := datastore.Get(ctx, key, &old); err == nil {
rev = old.Rev + 1
}
js["revision"] = rev
var t Tiddler
text, ok := js["text"].(string)
if ok {
t.Text = text
}
delete(js, "text")
t.Rev = rev
meta, err := json.Marshal(js)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
t.Meta = string(meta)
_, err = datastore.Put(ctx, key, &t)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
key2 := datastore.NewKey(ctx, "TiddlerHistory", title+"#"+fmt.Sprint(t.Rev), 0, nil)
if _, err := datastore.Put(ctx, key2, &t); err != nil {
http.Error(w, err.Error(), 500)
return
}
etag := fmt.Sprintf("\"bag/%s/%d:%x\"", url.QueryEscape(title), rev, md5.Sum(data))
w.Header().Set("Etag", etag)
}
func deleteTiddler(w http.ResponseWriter, r *http.Request) {
if !mustBeAdmin(w, r) {
return
}
ctx := appengine.NewContext(r)
if r.Method != "DELETE" {
http.Error(w, "bad method", 405)
return
}
title := strings.TrimPrefix(r.URL.Path, "/bags/bag/tiddlers/")
key := datastore.NewKey(ctx, "Tiddler", title, 0, nil)
var t Tiddler
if err := datastore.Get(ctx, key, &t); err != nil {
http.Error(w, err.Error(), 500)
return
}
t.Rev++
t.Meta = ""
t.Text = ""
if _, err := datastore.Put(ctx, key, &t); err != nil {
http.Error(w, err.Error(), 500)
return
}
key2 := datastore.NewKey(ctx, "TiddlerHistory", title+"#"+fmt.Sprint(t.Rev), 0, nil)
if _, err := datastore.Put(ctx, key2, &t); err != nil {
http.Error(w, err.Error(), 500)
return
}
}