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fix(android): open attachments directly with default viewer app #33

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fix(android): open attachments directly with default viewer app #33

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19 changes: 19 additions & 0 deletions src/lib/email-export.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,7 @@
import { Platform } from 'react-native';
import { Directory, File, Paths } from 'expo-file-system';
import * as FileSystemLegacy from 'expo-file-system/legacy';
import * as IntentLauncher from 'expo-intent-launcher';
import * as Sharing from 'expo-sharing';
import { jmapClient } from '../api/jmap-client';
import { getDownloadUrl } from '../api/blob';
Expand All @@ -12,6 +15,7 @@ import {
import { getClientCertAlias, secureFetch } from './client-cert';

const RFC822 = 'message/rfc822';
const FLAG_GRANT_READ_URI_PERMISSION = 0x00000001;

// Read the user's filename template + transform preferences for exports.
function emailFileOptions(): EmailFilenameOptions {
Expand Down Expand Up @@ -99,6 +103,21 @@ export async function shareAttachment(
const dest = new File(Paths.cache, filename);
const url = getDownloadUrl(blobId, filename, mimeType, accountId);
const downloaded = await downloadInto(url, dest, Paths.cache);

if (Platform.OS === 'android') {
try {
const contentUri = await FileSystemLegacy.getContentUriAsync(downloaded.uri);
await IntentLauncher.startActivityAsync('android.intent.action.VIEW', {
data: contentUri,
type: mimeType,
flags: FLAG_GRANT_READ_URI_PERMISSION,
});
return;
} catch {
// Fallback to sharing dialog if no viewer handles android.intent.action.VIEW
}
}

if (!(await Sharing.isAvailableAsync())) {
throw new Error('Sharing is not available on this device');
}
Expand Down