add api utils

frontend/src/api/utils/headers.ts

@@ -0,0 +1,19 @@
+export function setContentTypeHeaderJson(headers: Headers){
+    return headers.set("Content-Type", "application/json");
+}
+
+export function setAuthHeader(headers: Headers){
+    // retrieve session data from browser storage
+    const sessionStr = localStorage.getItem("session");
+    let loginResponse = null;
+    if(sessionStr){
+        loginResponse = JSON.parse(sessionStr);
+    }
+    // add token if possible
+    if(loginResponse && loginResponse.token){
+        headers.set("Authorization", "Bearer " + loginResponse.token)
+    } else {
+        console.log("No access token!")
+    }
+    return headers;
+}