Cara menerima file yang dibagikan

Palances Liao
Palances Liao

Cara modern

Menggunakan Web Share Target API

Pertama, deklarasikan share_target di manifes aplikasi web Anda yang mencantumkan action (URL Anda yang menangani file bersama), method ("POST" untuk file) dan enctype ("multipart/form-data" untuk file) serta objek params yang berisi properti files dengan array objek dengan properti name dan accept yang mencantumkan jenis file yang dapat dibagikan dan nama untuk mendapatkannya.

{
  "share_target": {
    "action": "/receive-files/",
    "method": "POST",
    "enctype": "multipart/form-data",
    "params": {
      "files": [
        {
          "name": "image",
          "accept": ["image/jpeg", "image/png", "image/webp", "image/gif"]
        }
      ]
    }
  }
}

Kemudian, Anda perlu menangani permintaan POST yang masuk di pekerja layanan. File ini disimpan untuk sementara di cache media, sehingga dapat digunakan di klien. Hal ini dapat dilakukan dengan mengalihkan aplikasi ke URL dengan parameter kueri penanda khusus seperti share-target.

self.addEventListener('fetch', (fetchEvent) => {
  if (fetchEvent.request.url.endsWith('/receive-files/') && fetchEvent.request.method === 'POST') {
    return fetchEvent.respondWith(
      (async () => {
        const formData = await fetchEvent.request.formData();
        const image = formData.get('image');
        const keys = await caches.keys();
        const mediaCache = await caches.open(keys.filter((key) => key.startsWith('media'))[0]);
        await mediaCache.put('shared-image', new Response(image));
        return Response.redirect('./?share-target', 303);
      })(),
    );
  }
});

Terakhir, Anda harus menggunakan file tersebut di klien.

window.addEventListener('load', async () => {
  if (location.search.includes('share-target')) {
    const keys = await caches.keys();
    const mediaCache = await caches.open(
      keys.filter((key) => key.startsWith('media'))[0],
    );
    const image = await mediaCache.match('shared-image');
    if (image) {
      const blob = await image.blob();
      await mediaCache.delete('shared-image');
      // Handle the shared file somehow.
    }
  }
});

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Demo

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="manifest" href="manifest.json" />
    <title>How to receive shared files</title>
    <link rel="stylesheet" href="style.css" />
    <!-- TODO: Devsite - Removed inline handlers -->
    <!-- <script>
      if ('serviceWorker' in navigator) {
        window.addEventListener('load', async () => {
          const registration = await navigator.serviceWorker.register(
            'sw.js',
          );
          console.log(
            'Service worker registered for scope',
            registration.scope,
          );
        });
      }
    </script>
    <script src="script.js" type="module"></script> -->
  </head>
  <body>
    <h1>How to receive shared files</h1>
    <p>Install the app. After the installation, try sharing an image to it from another app.
  </body>
</html>

CSS


        html {
  box-sizing: border-box;
  font-family: system-ui, sans-serif;
  color-scheme: dark light;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  margin: 1rem;
}

img {
  height: auto;
  max-width: 100%;
  display: block;
}

JS


        window.addEventListener('load', async () => {
  if (location.search.includes('share-target')) {
    const keys = await caches.keys();
    const mediaCache = await caches.open(
      keys.filter((key) => key.startsWith('media'))[0],
    );
    const image = await mediaCache.match('shared-image');
    if (image) {
      const blob = await image.blob();
      await mediaCache.delete('shared-image');
      // Handle the shared file somehow.
    }
  }
});