add ability to export and import to other browsers

src/components/cardSelector/CardSelector.tsx

@@ -3,6 +3,7 @@ import { StickyNoteButton } from "./StickyNoteButton"
 import { ImageCardButton } from "./ImageCardButton"
 import { ExportButton } from "./ExportButton"
 import { TextButton } from "./TextButton"
+import { ImportButton } from "./ImportButton"
 
 export function CardSelector() {
   const containerRef = useRef<HTMLDivElement>(null)
@@ -21,6 +22,7 @@ export function CardSelector() {
       <Divider />
 
       <ExportButton />
+      <ImportButton />
     </div>
   )
 }

src/components/cardSelector/ImportButton.tsx

@@ -0,0 +1,64 @@
+import images from "../../signals/images"
+import notes from "../../signals/notes"
+import { Card } from "../../types"
+import { convertBase64ToJson } from "../../utils/convertBase64ToJson"
+import { updateLocalStorage } from "../../utils/localStorage"
+import { defaultClassName } from "./utils"
+
+export function ImportButton() {
+
+  function _handleImport() {
+    const input = document.createElement('input')
+    input.type = 'file'
+    input.onchange = (e: any) => {
+      const file = e.target.files[0]
+      const reader = new FileReader()
+      reader.readAsDataURL(file)
+      reader.onload = function(readerEvent) {
+        let content = readerEvent.target?.result;
+        // get only the base64 parts and not any identifiers
+        content = (content as string).split(',')[1]
+        const data: Record<string, Card<'note'> | Card<'image'>> = convertBase64ToJson(content)
+        for (let key in data) {
+          const item = data[key]
+          if (item.type == 'image') {
+            const { id, ...rest } = item
+            images.addImage(rest)
+          }
+
+          if (item.type == 'note') {
+            const { id, ...rest } = item
+            notes.addNote(rest)
+          }
+        }
+
+        updateLocalStorage('notes', notes.notes.value)
+        updateLocalStorage('images', images.images.value)
+        notes.notes.notify()
+        images.images.notify()
+      }
+    }
+    input.click()
+  }
+
+  return (
+    <svg
+      onclick={_handleImport}
+      xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      stroke-width="2"
+      stroke-linecap="round"
+      stroke-linejoin="round"
+      className={"rotate-[180deg] " + defaultClassName}
+    >
+      <path
+        d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
+      <polyline points="7 10 12 15 17 10" />
+      <line x1="12" x2="12" y1="15" y2="3" />
+    </svg>
+  )
+}

src/utils/convertBase64ToJson.ts

@@ -0,0 +1,19 @@
+export function convertBase64ToJson(
+  data: string | ArrayBuffer | null | undefined
+) {
+  try {
+    if (!data) throw new Error("no data to decode")
+    if (data instanceof ArrayBuffer)
+      throw new Error("cannot decode array buffer yet")
+    // Decode Base64 to string
+    const jsonString = atob(data)
+
+    // Parse string to JSON
+    const jsonObject = JSON.parse(jsonString)
+
+    // Display the JSON object
+    return jsonObject
+  } catch (error) {
+    console.error("Error decoding Base64:", error)
+  }
+}