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112 lines
3.4 KiB
112 lines
3.4 KiB
package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/kyokomi/emoji"
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)
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const defaultListeningPort = "8000"
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func parseEnv() (listeningPort string) {
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listeningPort = os.Getenv("LISTENINGPORT")
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if len(listeningPort) == 0 {
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listeningPort = defaultListeningPort
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} else {
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value, err := strconv.Atoi(listeningPort)
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if err != nil {
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log.Fatal(emoji.Sprint(":x:") + " LISTENINGPORT environment variable '" + listeningPort +
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"' is not a valid integer")
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}
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if value < 1024 {
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if os.Geteuid() == 0 {
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log.Println(emoji.Sprint(":warning:") + "LISTENINGPORT environment variable '" + listeningPort +
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"' allowed to be in the reserved system ports range as you are running as root.")
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} else if os.Geteuid() == -1 {
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log.Println(emoji.Sprint(":warning:") + "LISTENINGPORT environment variable '" + listeningPort +
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"' allowed to be in the reserved system ports range as you are running in Windows.")
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} else {
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log.Fatal(emoji.Sprint(":x:") + " LISTENINGPORT environment variable '" + listeningPort +
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"' can't be in the reserved system ports range (1 to 1023) when running without root.")
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}
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}
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if value > 65535 {
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log.Fatal(emoji.Sprint(":x:") + " LISTENINGPORT environment variable '" + listeningPort +
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"' can't be higher than 65535")
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}
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if value > 49151 {
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// dynamic and/or private ports.
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log.Println(emoji.Sprint(":warning:") + "LISTENINGPORT environment variable '" + listeningPort +
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"' is in the dynamic/private ports range (above 49151)")
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}
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}
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return listeningPort
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}
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func healthcheckMode() bool {
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args := os.Args
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if len(args) > 1 {
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if len(args) > 2 {
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log.Fatal(emoji.Sprint(":x:") + " Too many arguments provided")
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}
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if args[1] == "healthcheck" {
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return true
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}
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log.Fatal(emoji.Sprint(":x:") + " Argument 1 can only be 'healthcheck', not " + args[1])
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}
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return false
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}
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func healthcheck(listeningPort string) {
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request, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:"+listeningPort+"/healthcheck", nil)
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if err != nil {
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fmt.Println("Can't build HTTP request")
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os.Exit(1)
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}
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client := &http.Client{Timeout: 1 * time.Second}
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response, err := client.Do(request)
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if err != nil {
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fmt.Println("Can't execute HTTP request")
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os.Exit(1)
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}
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if response.StatusCode != 200 {
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fmt.Println("Status code is " + response.Status)
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os.Exit(1)
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}
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os.Exit(0)
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}
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func main() {
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listeningPort := parseEnv()
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if healthcheckMode() {
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healthcheck(listeningPort)
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}
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fmt.Println("#####################################")
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fmt.Println("########## StackEdit Server #########")
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fmt.Println("########## by Quentin McGaw #########")
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fmt.Println("########## Give some " + emoji.Sprint(":heart:") + "at ##########")
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fmt.Println("# github.com/qdm12/stackedit-docker #")
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fmt.Print("#####################################\n\n")
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http.HandleFunc("/healthcheck", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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})
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if len(r.URL.Path) >= 4 && r.URL.Path[:4] == "/app" {
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if len(r.URL.Path) == 4 {
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r.URL.Path = "/"
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} else {
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r.URL.Path = strings.Replace("/"+r.URL.Path[5:], "//", "/", -1)
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}
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}
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http.ServeFile(w, r, "/html/"+r.URL.Path[1:])
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})
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log.Println("Web UI listening on 0.0.0.0:" + listeningPort + emoji.Sprint(" :ear:"))
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log.Fatal(http.ListenAndServe("0.0.0.0:"+listeningPort, nil))
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}
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