feat: support ENF service

Author: KevinZonda

src/const.go

@@ -12,6 +12,7 @@ const (
 		"    fgit get [URL<string>] [Path<string>] [--help|-h]\n" +
 		"    fgit conv [Target<string>] [--help|-h]\n" +
 		"    fgit jsdget [URL<string>] [Path<string>]\n" +
+		"    fgit host [show]\n" +
 		"    If you want to known more about extra-syntax, try to use --help"
 	jsdHelpMsg = "FastGit JsdGet Command Line Tool\n" +
 		"=============================\n" +
@@ -63,4 +64,17 @@ const (
 		"    fgit convert\n" +
 		"EXAMPLE\n" +
 		"    fgit conv gh"
+	hostHelpMsg = "FastGit Host Command Line Tool\n" +
+		"==============================\n" +
+		"REMARKS\n" +
+		"    Get hosts from FastGit Emergency Network Framework Api\n" +
+		"SYNTAX\n" +
+		"    fgit host [show]\n" +
+		"EXAMPLE\n" +
+		"    fgit host show"
+)
+
+const (
+	// FastGit UK Emergency Network Framework Host Api
+	fgEnfHostApi = "https://api.fastgit.org/enf/host"
 )

src/host.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func getNewHosts() map[string][]string {
+	str := getResponseString(fgEnfHostApi)
+	strs := strings.Split(str, "\n")
+	m := make(map[string][]string)
+	for _, s := range strs {
+		if s == "" {
+			continue
+		}
+		ss := strings.Split(s, ";")
+		m[ss[0]] = strings.Split(ss[1], ",")
+	}
+	return m
+}
+
+func createHostsContent(m map[string][]string) string {
+	var sb strings.Builder
+	for ip, prefixes := range m {
+		for _, prefix := range prefixes {
+			sb.WriteString(ip + " " + prefix + "fastgit.org\n")
+		}
+	}
+	return strings.Trim(sb.String(), "\n")
+}
+
+type HostFunc struct {
+}
+
+func (h *HostFunc) Run(args []string) {
+	fmt.Print("Fetching hosts from FastGit UK Emergency Network Framework...")
+	m := getNewHosts()
+	fmt.Println("Success!")
+	fmt.Println("Please modify your host by adding following content.")
+	content := createHostsContent(m)
+	fmt.Println(content)
+}

src/main.go

@@ -34,6 +34,9 @@ func main() {
 	case "conv", "convert":
 		runByArgs(&ConvFunc{})
 
+	case "host":
+		runByArgs(&HostFunc{})
+
 	case "-v", "--version", "version":
 		showVersion()
 	}

src/tools.go

@@ -27,6 +27,27 @@ func downloadFile(url, path string) {
 	fmt.Println("Finished.")
 }
 
+func getResponseString(url string) string {
+	var client http.Client
+	req, err := http.NewRequest("GET", url, nil)
+	checkErr(err, "Http.Get create failed!", 1)
+	req.Header.Set("User-Agent", "fgit/"+version)
+	checkErr(err, "Http.Get create failed!", 1)
+
+	resp, err := client.Do(req)
+	defer resp.Body.Close()
+	checkErr(err, "Http request failed!", 1)
+
+	if resp.StatusCode != http.StatusOK {
+		fmt.Printf("Error: response is not OK is %v!\n", resp.StatusCode)
+		os.Exit(1)
+	}
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	checkErr(err, "io.ReadAll failed!", 1)
+	return string(bodyBytes)
+}
+
 func isDir(path string) bool {
 	s, err := os.Stat(path)
 	if err != nil {