add basic user authentication

front/src/api.js

@@ -19,21 +19,43 @@ export function getBooks() {
 }
 
 export function postBook(book) {
-  return fetch(baseUrl + '/book', {
+  return genericPostCall('/book', book.value)
+}
+
+export function postLogin(user) {
+  return genericPostCall('/auth/login', user.value)
+}
+
+export function postSignUp(user) {
+  return genericPostCall('/auth/signup', user.value)
+}
+
+export function genericPostCall(apiRoute, object) {
+  return fetch(baseUrl + apiRoute, {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json'
     },
-    body: JSON.stringify(book.value)
+    body: JSON.stringify(object)
   })
 }
 
-export function postSignup(user) {
-  return fetch(baseUrl + '/auth/signup', {
-    method: 'POST',
-    headers: {
-      'Content-Type': 'application/json'
-    },
-    body: JSON.stringify(user.value)
-  })
+export function extractFromErrorFromField(fieldName, errors) {
+  if (errors === null || !('field' in errors)) {
+    return "";
+  }
+  const titleErr = errs.find((e) => e["field"] === fieldName);
+  if (typeof titleErr !== 'undefined') {
+    return titleErr.error;
+  } else {
+    return "";
+  }
+}
+
+export function extractGlobalFormError(errors) {
+  if (errors !== null && "error" in errors) {
+    return errors["error"];
+  } else {
+    return "";
+  }
 }