update composer with image upload

src/utils/createBlobFromFile.tsx

@@ -1,6 +1,6 @@
 import { readBinaryFile } from '@tauri-apps/api/fs';
 
-export async function createBlobFromFile(path: string): Promise<Blob> {
+export async function createBlobFromFile(path: string): Promise<Uint8Array> {
   const file = await readBinaryFile(path);
-  return new Blob([file]);
+  return file;
 }

src/utils/hooks/useUploader.tsx

@@ -0,0 +1,82 @@
+import { open } from '@tauri-apps/api/dialog';
+import { Body, fetch } from '@tauri-apps/api/http';
+
+import { createBlobFromFile } from '@utils/createBlobFromFile';
+
+interface UploadResponse {
+  fileID?: string;
+  fileName?: string;
+  imageUrl?: string;
+  lightningDestination?: string;
+  lightningPaymentLink?: string;
+  message?: string;
+  route?: string;
+  status: number;
+  success: boolean;
+  url?: string;
+  data?: {
+    url?: string;
+  };
+}
+
+export function useImageUploader() {
+  const upload = async (file: null | string, nip94?: boolean) => {
+    let filepath = file;
+
+    if (!file) {
+      const selected = await open({
+        multiple: false,
+        filters: [
+          {
+            name: 'Image',
+            extensions: ['png', 'jpeg', 'jpg', 'gif'],
+          },
+        ],
+      });
+      if (Array.isArray(selected)) {
+        // user selected multiple files
+      } else if (selected === null) {
+        // user cancelled the selection
+      } else {
+        filepath = selected;
+      }
+    }
+
+    const filename = filepath.split('/').pop();
+    const filetype = 'image/' + filename.split('.').pop();
+
+    const blob = await createBlobFromFile(filepath);
+    const res = await fetch('https://nostrimg.com/api/upload', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'multipart/form-data',
+      },
+      body: Body.form({
+        keys: filename,
+        image: {
+          file: blob,
+          mime: filetype,
+          fileName: filename,
+        },
+      }),
+    });
+
+    if (res.ok) {
+      const data = res.data as UploadResponse;
+      if (typeof data?.imageUrl === 'string' && data.success) {
+        if (nip94) {
+          console.log('todo');
+        }
+        return {
+          url: new URL(data.imageUrl).toString(),
+        };
+      }
+    }
+
+    return {
+      error: 'Upload failed',
+    };
+  };
+
+  return upload;
+}