Refactor frontend JavaScript

web/index.html

@@ -63,8 +63,6 @@
         </div>
     </div>
     <script src="//cdn.jsdelivr.net/gh/highlightjs/cdn-release@10.1.2/build/highlight.min.js"></script>
-    <script src="js/rest.js"></script>
-    <script src="js/buttons.js"></script>
-    <script src="js/autoload.js"></script>
+    <script src="js/autoload.js" type="module"></script>
 </body>
 </html>

web/js/api.js

@@ -0,0 +1,35 @@
+// getAPIInformation returns the API information
+export async function getAPIInformation() {
+    return await fetch(location.protocol + "//" + location.host + "/api/v1/info");
+}
+
+// getPaste retrieves a paste
+export async function getPaste(id) {
+    return await fetch(location.protocol + "//" + location.host + "/api/v1/pastes/" + id);
+}
+
+// createPaste creates a new paste
+export async function createPaste(content) {
+    return await fetch(location.protocol + "//" + location.host + "/api/v1/pastes", {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({
+            content
+        })
+    });
+}
+
+// deletePaste deletes a paste
+export async function deletePaste(id, deletionToken) {
+    return await fetch(location.protocol + "//" + location.host + "/api/v1/pastes/" + id, {
+        method: 'DELETE',
+        headers: {
+            'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({
+            deletionToken
+        })
+    });
+}

web/js/autoload.js

@@ -1,53 +1,60 @@
-// Load the API information
-loadAPIInfo();
+// Import the used modules
+import * as api from "./api.js";
+import * as buttons from "./buttons.js";
 
-// Set up the keybinds
-setupKeybinds();
+// Set up the buttons
+buttons.setupButtons();
+buttons.setupKeybinds();
+
+// Load the API information
+async function loadAPIInformation() {
+    const response = await api.getAPIInformation();
+    if (response.ok) {
+        const data = await response.json();
+        document.getElementById("version").innerText = data.version;
+    }
+}
+loadAPIInformation();
 
 // Try to load a paste if one exists
-let PASTE_ID = "";
-function loadPaste() {
-    let split = location.pathname.split(".");
-    let pasteID = split[0];
-    let language = split[1];
-    getPaste(pasteID, function(success, data) {
-        // Return if no paste was found
-        if (!success) {
+export let PASTE_ID;
+async function loadPaste() {
+    if (location.pathname != "/") {
+        // Define the paste ID and language
+        const split = location.pathname.replace("/", "").split(".");
+        const pasteID = split[0];
+        const language = split[1];
+    
+        // Retrieve the paste from the API and redirect the user to the main page if it could not be found
+        const response = await api.getPaste(pasteID);
+        if (!response.ok) {
             location.replace(location.protocol + "//" + location.host);
             return;
-        };
+        }
+        const data = await response.json();
     
-        // Enable and disable the corresponding buttons
+        // Adjust the button states
         document.getElementById("btn_save").setAttribute("disabled", true);
         document.getElementById("btn_delete").removeAttribute("disabled");
         document.getElementById("btn_copy").removeAttribute("disabled");
     
-        // Set the paste content to the DOM and display the line numbers
+        // Set the paste content to the DOM
         document.getElementById("code").innerHTML = language
             ? hljs.highlight(language, data.content).value
             : hljs.highlightAuto(data.content).value;
-        for (i = 1; i <= data.content.split(/\n/).length; i++) {
-            document.getElementById("linenos").innerHTML += "<span>" + i + "</span>";
-        }
+        
+        // Display the line numbers
+        const lineNumbersElement = document.getElementById("linenos");
+        data.content.split(/\n/).forEach(function(_currentValue, index) {
+            lineNumbersElement.innerHTML += "<span>" + (index + 1) + "</span>";
+        });
     
         // Set the PASTE_ID variable
         PASTE_ID = pasteID;
-    });
-}
-if (location.pathname != "/") {
-    loadPaste();
     } else {
-    const element = document.getElementById("input");
-    element.classList.remove("hidden");
-    element.focus();
+        const input = document.getElementById("input");
+        input.classList.remove("hidden");
+        input.focus();
     }
-
-// Define a function to copy text to the clipboard
-function copyToClipboard(text) {
-    const element = document.createElement("textarea");
-    element.value = text;
-    document.body.appendChild(element);
-    element.select();
-    document.execCommand("copy");
-    document.body.removeChild(element);
 }
+loadPaste();

web/js/buttons.js

@@ -1,8 +1,14 @@
+// Import the used modules
+import * as api from "./api.js";
+import * as autoload from "./autoload.js";
+
 // setupKeybinds initializes the keybinds for the buttons
-function setupKeybinds() {
+export function setupKeybinds() {
     window.onkeydown = function(event) {
+        // Return if the CTRL key was not pressed
         if (!event.ctrlKey) return;
     
+        // Define the DOM element of the pressed button
         let element = null;
         switch (event.keyCode) {
             case 81: {
@@ -23,60 +29,80 @@ function setupKeybinds() {
             }
         }
     
+        // Call the onClick function of the button
         if (element) {
             if (element.hasAttribute("disabled")) return;
             event.preventDefault();
-            element.onclick();
+            element.click();
         }
     }
 }
 
+// setupButtons configures the click listeners of the buttons
+export function setupButtons() {
     // Define the behavior of the 'new' button
-document.getElementById("btn_new").onclick = function() {
+    document.getElementById("btn_new").addEventListener("click", function() {
         location.replace(location.protocol + "//" + location.host);
-}
+    });
 
     // Define the behavior of the 'save' button
-document.getElementById("btn_save").onclick = function() {
+    document.getElementById("btn_save").addEventListener("click", async function() {
         // Return if the text area is empty
-    if (!document.getElementById("input").value) return;
+        const input = document.getElementById("input");
+        if (!input.value) return;
 
         // Create the paste
-    createPaste(document.getElementById("input").value, function(success, data) {
-        // Notify the user about an error if one occurs
-        if (!success) {
+        const response = await api.createPaste(input.value);
+        if (!response.ok) {
             alert("Error:\n\n" + data);
             return;
         }
+        const data = await response.json();
 
         // Redirect the user to the paste page
         let address = location.protocol + "//" + location.host + "/" + data.id;
         if (data.suggestedSyntaxType) address += "." + data.suggestedSyntaxType;
-        copyToClipboard(data.deletionToken);
         location.replace(address);
+
+        // TODO: Find a solution to display the deletion token
     });
-}
 
     // Define the behavior of the 'delete' button
-document.getElementById("btn_delete").onclick = function() {
+    document.getElementById("btn_delete").addEventListener("click", async function() {
         // Ask the user for the deletion token
-    let deletionToken = window.prompt("Deletion Token:");
+        const deletionToken = window.prompt("Deletion Token:");
         if (!deletionToken) return;
 
         // Delete the paste
-    deletePaste(PASTE_ID, deletionToken, function(success, data) {
-        // Notify the user about an error if one occurs
-        if (!success) {
+        const response = await api.deletePaste(autoload.PASTE_ID, deletionToken);
+        const data = await response.text();
+        if (!response.ok) {
             alert("Error:\n\n" + data);
             return;
         }
 
-        // Redirect the user to the default page
+        // Redirect the user to the main page
         location.replace(location.protocol + "//" + location.host);
     });
+
+    // Define the behavior of the 'copy' button
+    document.getElementById("btn_copy").addEventListener("click", async function() {
+        // Ask for the clipboard permissions
+        askClipboardPermissions();
+        
+        // Copy the code
+        await navigator.clipboard.writeText(document.getElementById("code").innerText);
+    });
 }
 
-// Define the behavior of the 'copy' button
-document.getElementById("btn_copy").onclick = function() {
-    copyToClipboard(document.getElementById("code").innerText);
+// askClipboardPermissions asks the user for the clipboard permissions
+async function askClipboardPermissions() {
+    try {
+        const state = await navigator.permissions.query({
+            name: "clipbaord-write"
+        });
+        return state === "granted";
+    } catch (error) {
+        return false;
+    }
 }

web/js/rest.js

@@ -1,56 +0,0 @@
-// loadAPIInfo loads and displays the API information
-function loadAPIInfo() {
-    fetch(location.protocol + "//" + location.host + "/api/v1/info")
-        .then(response => response.json())
-        .then(data => document.getElementById("version").innerText = data.version);
-}
-
-// getPaste retrieves a paste
-function getPaste(id, callback) {
-    fetch(location.protocol + "//" + location.host + "/api/v1/pastes/" + id)
-        .then(response => {
-            if (response.status != 200) {
-                response.text().then(data => callback(false, data));
-                return;
-            }
-            response.json().then(data => callback(true, data));
-        });
-}
-
-// createPaste creates a new paste
-function createPaste(content, callback) {
-    fetch(location.protocol + "//" + location.host + "/api/v1/pastes", {
-        method: 'POST',
-        headers: {
-            'Content-Type': 'application/json'
-        },
-        body: JSON.stringify({
-            content: content
-        })
-    }).then(response => {
-        if (response.status != 200) {
-            response.text().then(data => callback(false, data));
-            return;
-        }
-        response.json().then(data => callback(true, data));
-    });
-}
-
-// deletePaste deletes a paste
-function deletePaste(id, deletionToken, callback) {
-    fetch(location.protocol + "//" + location.host + "/api/v1/pastes/" + id, {
-        method: 'DELETE',
-        headers: {
-            'Content-Type': 'application/json'
-        },
-        body: JSON.stringify({
-            deletionToken: deletionToken
-        })
-    }).then(response => {
-        if (response.status != 200) {
-            response.text().then(data => callback(false, data));
-            return;
-        }
-        response.text().then(data => callback(true, data));
-    });
-}