copied from a project that was version on mercurial

main.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/gorilla/mux"
+	"io/ioutil"
+	"launchpad.net/goyaml"
+	"log"
+	"net/http"
+	"path"
+)
+
+const helloworld string = `
+ ____  ____  ____  ____  ____  ____  ____  ____  ____  ____  ____  ____ 
+||s ||||e ||||r ||||v ||||i ||||n ||||g ||||: ||||8 ||||0 ||||0 ||||0 ||
+||__||||__||||__||||__||||__||||__||||__||||__||||__||||__||||__||||__||
+|/__\||/__\||/__\||/__\||/__\||/__\||/__\||/__\||/__\||/__\||/__\||/__\|
+
+`
+
+type WebAppServers []*WebAppServer
+
+func (this WebAppServers) Handle(w http.ResponseWriter, request *http.Request) {
+	for _, was := range this {
+		if was.Subdomain == mux.Vars(request)["subdomain"] {
+			was.Handle(w, request)
+			return
+		}
+	}
+	fmt.Fprint(w, "could not find a web application for ")
+}
+
+func (this WebAppServers) Localize(domain string) WebAppServers {
+	fmt.Println(">>", domain)
+	ret := make(WebAppServers, len(this))
+	for i, was := range this {
+		ret[i] = was.Localize(domain)
+	}
+	return ret
+}
+
+var webAppServers WebAppServers
+var port int = 8000
+
+func init() {
+	var err error
+	webAppServers, err = loadWebAppServers()
+	if err != nil {
+		panic(err)
+	}
+}
+
+func loadWebAppServers() (WebAppServers, error) {
+	data, err := ioutil.ReadFile("webapps.yml")
+	if err != nil {
+		return nil, err
+	}
+	return loadWebAppServersFromYamlFile(data)
+
+}
+
+func loadWebAppServersFromYamlFile(yamlFile []byte) (WebAppServers, error) {
+	ret := make(WebAppServers, 0, 10)
+	err := goyaml.Unmarshal(yamlFile, &ret)
+	return ret, err
+
+}
+
+func serveStatic(router *mux.Router) {
+	handler := func(w http.ResponseWriter, request *http.Request) {
+		vars := mux.Vars(request)
+		filepath := "/" + vars["path"]
+		w.Header().Set("Cache-Control", "public, max-age=43200")
+		http.ServeFile(w, request, path.Join("client/", filepath))
+	}
+	router.HandleFunc("/{path:.*}", handler)
+}
+
+func ServeWebApps(router *mux.Router) {
+	router.HandleFunc("/{path:.*}", webAppServers.Handle)
+}
+
+func WebappHandler(w http.ResponseWriter, request *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	encoder := json.NewEncoder(w)
+	encoder.Encode(webAppServers.Localize(request.Host))
+}
+
+func createMuxRouter() http.Handler {
+	r := mux.NewRouter()
+	ServeWebApps(r.Host(`{subdomain:\w+}.{domain:\w+}.{topleveldomain:[a-z]+}`).Subrouter())
+	ServeWebApps(r.Host(`{subdomain:\w+}.localhost`).Subrouter())
+	ServeWebApps(r.Host(`{subdomain:\w+}.\d{1-3}.\d{1-3}.\d{1-3}.\d{1-3}`).Subrouter())
+	r.HandleFunc("/webapps", WebappHandler)
+	serveStatic(r.PathPrefix("/").Subrouter())
+	return r
+}
+
+func main() {
+	fmt.Print(helloworld)
+	address := fmt.Sprintf("0.0.0.0:%v", port)
+	if err := http.ListenAndServe(address, createMuxRouter()); err != nil {
+		log.Fatal(err)
+	}
+}