Implemented article get endpoint

js/api.js

@@ -28,7 +28,7 @@ async function login(username, password) {
     let result = await fetch(`${prefix}/api/login`, {
         method: "POST",
         body: JSON.stringify({ "username": username, "password": password }),
-        credentials: "include"
+        credentials: "same-origin"
     });
     switch (result.status) {
         case 200:
@@ -79,6 +79,22 @@ async function search(q) {
         throw unknownResponse(result);
     }
 }
+async function getArticle(id) {
+    let query = [["id", id]];
+    let result = await fetch(`${prefix}/api/article?${buildQuery(query)}`, {
+        method: "GET"
+    });
+    switch (result.status) {
+        case 200:
+            return await result.json();
+        case 401:
+            throw new Error("Not authorized");
+        case 404:
+            throw new Error("Article not found");
+        default:
+            throw await unknownResponse(result);
+    }
+}
 async function uploadArticle(payload) {
     let result = await fetch(`${prefix}/api/article`, {
         method: "POST",