/
main.go
164 lines (144 loc) · 4.4 KB
/
main.go
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package main
import (
"log"
"net/url"
"net/http"
"net/http/httputil"
"encoding/json"
"github.com/spf13/viper"
"github.com/xiwenc/cf-fastpush-controller/lib"
"os"
"strings"
)
type VCAP_APPLICATION struct {
ApplicationID string `json:"application_id"`
}
var appCmd string
var listenOn string
var backendOn string
func main() {
viper.SetConfigName("cf-fastpush-controller")
viper.AddConfigPath("/etc/")
viper.AddConfigPath("$HOME/.config/")
viper.AddConfigPath(".")
viper.ReadInConfig()
viper.AutomaticEnv()
viper.SetDefault(lib.CONFIG_BIND_ADDRESS, "0.0.0.0")
viper.SetDefault(lib.CONFIG_PORT, "9000")
viper.SetDefault(lib.CONFIG_BACKEND_DIRS, "./")
viper.SetDefault(lib.CONFIG_RESTART_REGEX, "^*.py$")
viper.SetDefault(lib.CONFIG_IGNORE_REGEX, "")
viper.SetDefault(lib.CONFIG_BACKEND_COMMAND, "python -m http.server")
viper.SetDefault(lib.CONFIG_BACKEND_PORT, "8080")
viper.SetDefault(lib.CONFIG_BASE_PATH, "/_fastpush")
appCmd = viper.GetString(lib.CONFIG_BACKEND_COMMAND)
listenOn = viper.GetString(lib.CONFIG_BIND_ADDRESS) + ":" + viper.GetString(lib.CONFIG_PORT)
backendOn = "127.0.0.1:" + viper.GetString(lib.CONFIG_BACKEND_PORT)
basePath := viper.GetString(lib.CONFIG_BASE_PATH)
localAuthToken := GetLocalToken();
log.Println("Controller listening to: " + listenOn)
http.HandleFunc(basePath + "/files", func(w http.ResponseWriter, r *http.Request) {
SetJsonContentType(w)
if !IsAuthenticated(r, localAuthToken) {
http.Error(w, "Invalid authentication token", http.StatusUnauthorized)
return
}
if r.Method == "GET" {
ListFiles(w, r)
} else if r.Method == "PUT" {
UploadFiles(w, r)
} else {
http.Error(w, "Invalid request method.", http.StatusMethodNotAllowed)
}
})
http.HandleFunc(basePath + "/restart", func(w http.ResponseWriter, r *http.Request) {
SetJsonContentType(w)
if !IsAuthenticated(r, localAuthToken) {
http.Error(w, "Invalid authentication token", http.StatusUnauthorized)
return
}
if r.Method == "POST" {
RestartApp(w, r)
} else {
http.Error(w, "Invalid request method.", http.StatusMethodNotAllowed)
}
})
http.HandleFunc(basePath + "/status", func(w http.ResponseWriter, r *http.Request) {
SetJsonContentType(w)
if !IsAuthenticated(r, localAuthToken) {
http.Error(w, "Invalid authentication token", http.StatusUnauthorized)
return
}
if r.Method == "GET" {
GetStatus(w, r)
} else {
http.Error(w, "Invalid request method.", http.StatusMethodNotAllowed)
}
})
reverseProxy := httputil.NewSingleHostReverseProxy(&url.URL{
Scheme: "http",
Host: backendOn,
})
http.HandleFunc("/", ReverseProxyHandler(reverseProxy))
go lib.RestartApp(appCmd)
go lib.ListFiles()
http.ListenAndServe(listenOn, nil)
}
func SetJsonContentType(w http.ResponseWriter) {
w.Header().Set("Content-Type", "application/json")
}
func IsAuthenticated(r *http.Request, localToken string) bool {
incomingToken := r.Header.Get("x-auth-token")
if strings.Compare(localToken, "") != 0 && strings.Compare(localToken, incomingToken) == 0 {
return true
} else {
return false
}
}
func GetLocalToken() string {
envs := os.Environ()
var vcap VCAP_APPLICATION
for _, env := range envs {
tokens := strings.SplitN(env, "=", 2)
if strings.Compare(tokens[0], "VCAP_APPLICATION") == 0 {
data := []byte(tokens[1])
if err := json.Unmarshal(data, &vcap); err != nil {
panic(err)
} else {
token := vcap.ApplicationID
log.Println("Authentication token: " + token)
return token
}
}
}
log.Println("Unable to determine local Authentication Token")
return ""
}
func ReverseProxyHandler(p *httputil.ReverseProxy) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
log.Println(r.URL)
p.ServeHTTP(w, r)
}
}
func ListFiles(w http.ResponseWriter, r *http.Request) {
files := lib.ListFiles()
json.NewEncoder(w).Encode(files)
}
func RestartApp(w http.ResponseWriter, r *http.Request) {
result := lib.RestartApp(appCmd)
json.NewEncoder(w).Encode(result)
}
func GetStatus(w http.ResponseWriter, r *http.Request) {
result := lib.GetStatus()
json.NewEncoder(w).Encode(result)
}
func UploadFiles(w http.ResponseWriter, r *http.Request) {
inputFiles := map[string]*lib.FileEntry{}
err := json.NewDecoder(r.Body).Decode(&inputFiles)
if err != nil {
log.Println(err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
}
result := lib.UploadFiles(inputFiles)
json.NewEncoder(w).Encode(result)
}