Upgrade to use versioned API with old fallback

Author: jstrieb

api.js

@@ -0,0 +1,57 @@
+/**
+ * api.js
+ *
+ * API For encoding and decoding URL hash objects
+ *
+ * Created by Jacob Strieb
+ * July 2020
+ */
+
+
+/*******************************************************************************
+ * Global Variables
+ ******************************************************************************/
+
+const LATEST_API_VERSION = "0.0.1";
+// const LATEST_API_VERSION = "0.2.0";
+
+var apiVersions = {};
+
+
+
+/*******************************************************************************
+ * API Version 0.2.0 (Latest)
+ ******************************************************************************/
+
+apiVersions["0.2.0"] = {
+
+  VERSION: "0.2.0",
+
+  /* Return a link to view the page */
+  getViewLink: function(pageData) {
+    var urlData = {
+      version: this.VERSION,
+    };
+
+    const hashObject = b64.encode(JSON.stringify(urlData));
+    return `http://jstrieb.github.io/urlpages/#${hashObject}`;
+  },
+
+}
+
+
+
+/*******************************************************************************
+ * API Version 0.0.1 (Original)
+ ******************************************************************************/
+
+apiVersions["0.0.1"] = {
+
+  VERSION: "0.0.1",
+
+  /* Return a link to view the page */
+  getViewLink: function(pageData) {
+    return `http://jstrieb.github.io/urlpages/#${b64.encode(pageData)}`;
+  },
+
+}

editor/editor.js

@@ -3,6 +3,8 @@
  * in the documentation
  */
 
+api = apiVersions[LATEST_API_VERSION]
+
 
 
 /***
@@ -35,13 +37,6 @@ ${data["html"]}
 }
 
 
-/* Return a link to view the page */
-function getViewLink(pageData) {
-  return `http://jstrieb.github.io/urlpages/#${b64.encode(pageData)}`;
-}
-
-
-
 /***
  * Button press functions
  ***/
@@ -58,7 +53,7 @@ function setViewUrl() {
   var html = encodeURIComponent(getHTML(data));
 
 	// Update the URL for the "Short Link" button
-  document.getElementById("url").value = getViewLink(html);
+  document.getElementById("url").value = api.getViewLink(html);
 }
 
 
@@ -129,7 +124,7 @@ function update() {
   window.location.hash = "#" + b64.encode(JSON.stringify(data));
 
   // Update the URL for the "Get Link" button
-  document.getElementById("getLinkLink").href = getViewLink(html);
+  document.getElementById("getLinkLink").href = api.getViewLink(html);
 
   // Update the download link
   document.getElementById("downloadLink").href = `data:text/html,${html}`

editor/index.html

@@ -11,6 +11,7 @@
 
   <!-- Scripts -->
   <script src="../b64.js" type="text/javascript"></script>
+  <script src="../api.js" type="text/javascript"></script>
   <script src="editor.js" type="text/javascript"></script>
 </head>
 

index.html

@@ -11,7 +11,14 @@
   // Try to get page data from the URL if possible
   var hash = window.location.hash.slice(1);
   var data = b64.decode(hash);
-  document.write(decodeURIComponent(data));
+
+  try {
+    var urlDataObject = JSON.parse(data);
+    var api = apiVersions[urlDataObject.version];
+    document.write(api.decode(urlDataObject));
+  } catch (err) {
+    document.write(decodeURIComponent(data));
+  }
 } else {
   // Otherwise redirect to the editor
   window.location.replace("./editor");