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pt-br/code/src/apps/ch.4.2/main.go

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+// Example code for Chapter 4.2 from "Build Web Application with Golang"
+// Purpose: Shows how to perform server-side validation of user input from a form.
+// Also shows to use multiple template files with predefined template names.
+// Run `go run main.go` and then access http://localhost:9090
+package main
+
+import (
+	"apps/ch.4.2/validator"
+	"html/template"
+	"log"
+	"net/http"
+)
+
+const (
+	PORT     = "9090"
+	HOST_URL = "http://localhost:" + PORT
+)
+
+var t *template.Template
+
+type Links struct {
+	BadLinks [][2]string
+}
+
+// invalid links to display for testing.
+var links Links
+
+func index(w http.ResponseWriter, r *http.Request) {
+	http.Redirect(w, r, HOST_URL+"/profile", http.StatusTemporaryRedirect)
+}
+func profileHandler(w http.ResponseWriter, r *http.Request) {
+	t.ExecuteTemplate(w, "profile", links)
+}
+func checkProfile(w http.ResponseWriter, r *http.Request) {
+	r.ParseForm()
+	p := validator.ProfilePage{&r.Form}
+	t.ExecuteTemplate(w, "submission", p.GetErrors())
+}
+
+// This function is called before main()
+func init() {
+	// Note: we can reference the loaded templates by their defined name inside the template files.
+	t = template.Must(template.ParseFiles("profile.gtpl", "submission.gtpl"))
+
+	list := make([][2]string, 2)
+	list[0] = [2]string{HOST_URL + "/checkprofile", "No data"}
+	list[1] = [2]string{HOST_URL + "/checkprofile?age=1&gender=guy&shirtsize=big", "Invalid options"}
+	links = Links{list}
+}
+func main() {
+	http.HandleFunc("/", index)
+	http.HandleFunc("/profile", profileHandler)
+	http.HandleFunc("/checkprofile", checkProfile)
+
+	err := http.ListenAndServe(":"+PORT, nil) // setting listening port
+	if err != nil {
+		log.Fatal("ListenAndServe: ", err)
+	}
+}