From ce2517b9fb70403d1dbeb52194ccd55122f8ed14 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Thu, 11 Jun 2020 10:16:46 +0100
Subject: [PATCH] Support embedding Riot Web (#1113)

    * Embed

    * Support for embedding is better now

    * HTTP on localhost for Ygg demo

    * Move embed into Yggdrasil demo
---
 .gitignore                                    |  3 +
 .../embed/embed_other.go                      |  7 +++
 .../embed/embed_riotweb.go                    | 61 +++++++++++++++++++
 cmd/dendrite-demo-yggdrasil/main.go           |  5 +-
 go.mod                                        |  1 +
 5 files changed, 76 insertions(+), 1 deletion(-)
 create mode 100644 cmd/dendrite-demo-yggdrasil/embed/embed_other.go
 create mode 100644 cmd/dendrite-demo-yggdrasil/embed/embed_riotweb.go

diff --git a/.gitignore b/.gitignore
index 1de8887c..34c5b680 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,3 +49,6 @@ dendrite.yaml
 
 # Log files
 *.log* 
+
+# Generated code
+cmd/dendrite-demo-yggdrasil/embed/fs*.go
diff --git a/cmd/dendrite-demo-yggdrasil/embed/embed_other.go b/cmd/dendrite-demo-yggdrasil/embed/embed_other.go
new file mode 100644
index 00000000..a9108fad
--- /dev/null
+++ b/cmd/dendrite-demo-yggdrasil/embed/embed_other.go
@@ -0,0 +1,7 @@
+// +build !riotweb
+
+package embed
+
+func Embed(_ int, _ string) {
+
+}
diff --git a/cmd/dendrite-demo-yggdrasil/embed/embed_riotweb.go b/cmd/dendrite-demo-yggdrasil/embed/embed_riotweb.go
new file mode 100644
index 00000000..360d0bc5
--- /dev/null
+++ b/cmd/dendrite-demo-yggdrasil/embed/embed_riotweb.go
@@ -0,0 +1,61 @@
+// +build riotweb
+
+package embed
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/tidwall/sjson"
+)
+
+// From within the Riot Web directory:
+// go run github.com/mjibson/esc -o /path/to/dendrite/internal/embed/fs_riotweb.go -private -pkg embed .
+
+func Embed(listenPort int, serverName string) {
+	url := fmt.Sprintf("http://localhost:%d", listenPort)
+	embeddedFS := _escFS(false)
+	embeddedServ := http.FileServer(embeddedFS)
+
+	http.DefaultServeMux.Handle("/", embeddedServ)
+	http.DefaultServeMux.HandleFunc("/config.json", func(w http.ResponseWriter, _ *http.Request) {
+		configFile, err := embeddedFS.Open("/config.sample.json")
+		if err != nil {
+			w.WriteHeader(500)
+			io.WriteString(w, "Couldn't open the file: "+err.Error())
+			return
+		}
+		configFileInfo, err := configFile.Stat()
+		if err != nil {
+			w.WriteHeader(500)
+			io.WriteString(w, "Couldn't stat the file: "+err.Error())
+			return
+		}
+		buf := make([]byte, configFileInfo.Size())
+		n, err := configFile.Read(buf)
+		if err != nil {
+			w.WriteHeader(500)
+			io.WriteString(w, "Couldn't read the file: "+err.Error())
+			return
+		}
+		if int64(n) != configFileInfo.Size() {
+			w.WriteHeader(500)
+			io.WriteString(w, "The returned file size didn't match what we expected")
+			return
+		}
+		js, _ := sjson.SetBytes(buf, "default_server_config.m\\.homeserver.base_url", url)
+		js, _ = sjson.SetBytes(js, "default_server_config.m\\.homeserver.server_name", serverName)
+		js, _ = sjson.SetBytes(js, "brand", fmt.Sprintf("Riot %s", serverName))
+		js, _ = sjson.SetBytes(js, "disable_guests", true)
+		js, _ = sjson.SetBytes(js, "disable_3pid_login", true)
+		js, _ = sjson.DeleteBytes(js, "welcomeUserId")
+		_, _ = w.Write(js)
+	})
+
+	fmt.Println("*-------------------------------*")
+	fmt.Println("| This build includes Riot Web! |")
+	fmt.Println("*-------------------------------*")
+	fmt.Println("Point your browser to:", url)
+	fmt.Println()
+}
diff --git a/cmd/dendrite-demo-yggdrasil/main.go b/cmd/dendrite-demo-yggdrasil/main.go
index b1530e88..6ef56d32 100644
--- a/cmd/dendrite-demo-yggdrasil/main.go
+++ b/cmd/dendrite-demo-yggdrasil/main.go
@@ -28,6 +28,7 @@ import (
 
 	"github.com/matrix-org/dendrite/appservice"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/convert"
+	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/embed"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/signing"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/yggconn"
 	"github.com/matrix-org/dendrite/eduserver"
@@ -166,6 +167,8 @@ func main() {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}
 
+	embed.Embed(*instancePort, "Yggdrasil Demo")
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@@ -198,7 +201,7 @@ func main() {
 		logrus.Fatal(httpServer.Serve(ygg))
 	}()
 	go func() {
-		httpBindAddr := fmt.Sprintf(":%d", *instancePort)
+		httpBindAddr := fmt.Sprintf("localhost:%d", *instancePort)
 		logrus.Info("Listening on ", httpBindAddr)
 		logrus.Fatal(http.ListenAndServe(httpBindAddr, nil))
 	}()
diff --git a/go.mod b/go.mod
index a93f9a83..a05bb71e 100644
--- a/go.mod
+++ b/go.mod
@@ -31,6 +31,7 @@ require (
 	github.com/prometheus/client_golang v1.4.1
 	github.com/sirupsen/logrus v1.6.0
 	github.com/tidwall/gjson v1.6.0
+	github.com/tidwall/sjson v1.0.3
 	github.com/uber-go/atomic v1.3.0 // indirect
 	github.com/uber/jaeger-client-go v2.15.0+incompatible
 	github.com/uber/jaeger-lib v1.5.0