Issue #29: User can't answer a form twice

Signed-off-by: Richard Heise <rfhf19@inf.ufpr.br>

src/pages/AnswerForm.js

@@ -153,6 +153,7 @@ function AnwserForm() {
       const res = await api
         .post(`/answer/${id}`, backendTranslation())
         .then(function(res) {
+          setCookie("answerForm", id, 92);
           alert("Formulário respondido!");
         })
         .catch(error => {
@@ -205,6 +206,7 @@ function AnwserForm() {
     const res = await api
       .get(`/form/${id}`)
       .then(function(res) {
+        checkCookie(id);
         setFormData(res.data);
         mapInputs(res.data);
       })
@@ -223,6 +225,38 @@ function AnwserForm() {
       });
   }
 
+  function setCookie(cookieName, cookieValue, expirationsDays) {
+    var date = new Date();
+    date.setTime(date.getTime() + expirationsDays * 60 * 60 * 24 * 1000);
+    var expires = "expires=" + date.toUTCString();
+    document.cookie =
+      cookieName + "=" + cookieValue + ";" + expires + ";path=/";
+  }
+
+  function getCookie(cookieName) {
+    var name = cookieName + "=";
+    var ca = document.cookie.split(";");
+    for (var i = 0; i < ca.length; i++) {
+      var c = ca[i];
+      while (c.charAt(0) == " ") {
+        c = c.substring(1);
+      }
+      if (c.indexOf(name) == 0) {
+        return c.substring(name.length, c.length);
+      }
+    }
+    return "";
+  }
+
+  function checkCookie(id) {
+    var answer = getCookie("answerForm");
+    if (answer == id) {
+      alert("Você já respondeu esse formulário! ");
+      let path = `/signin`;
+      history.push(path);
+    }
+  }
+
   /** First thing the page does is getting the form from the API. */
   useEffect(() => {
     getForm(id);