NativeScript/nativescript-core/utils/utils.android.ts

import { ad } from "./native-helper";
import { device } from "../platform";
import { FileSystemAccess } from "../file-system/file-system-access";
import {
    write as traceWrite,
    categories as traceCategories,
    messageType as traceMessageType,
} from "../trace";

export { ad };
export * from "./utils-common";

const MIN_URI_SHARE_RESTRICTED_APK_VERSION = 24;

export function GC() {
    gc();
}

export function releaseNativeObject(object: java.lang.Object) {
    __releaseNativeCounterpart(object);
}

export function openUrl(location: string): boolean {
    const context = ad.getApplicationContext();
    try {
        const intent = new android.content.Intent(android.content.Intent.ACTION_VIEW, android.net.Uri.parse(location.trim()));
        intent.addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK);

        context.startActivity(intent);
    } catch (e) {
        // We Don't do anything with an error.  We just output it
        traceWrite("Error in OpenURL", traceCategories.Error, traceMessageType.error);

        return false;
    }

    return true;
}

/**
 * Check whether external storage is read only
 *
 * @returns {boolean} whether the external storage is read only
 */
function isExternalStorageReadOnly(): boolean {
    const extStorageState = android.os.Environment.getExternalStorageState();
    if (android.os.Environment.MEDIA_MOUNTED_READ_ONLY === extStorageState) {
        return true;
    }

    return false;
}

/**
 * Checks whether external storage is available
 *
 * @returns {boolean} whether external storage is available
 */
function isExternalStorageAvailable(): boolean {
    const extStorageState = android.os.Environment.getExternalStorageState();
    if (android.os.Environment.MEDIA_MOUNTED === extStorageState) {
        return true;
    }

    return false;
}

/**
 * Detect the mimetype of a file at a given path
 *
 * @param {string} filePath
 * @returns {string} mimetype
 */
function getMimeTypeNameFromExtension(filePath: string): string {
    const mimeTypeMap = android.webkit.MimeTypeMap.getSingleton();
    const extension = new FileSystemAccess()
        .getFileExtension(filePath)
        .replace(".", "")
        .toLowerCase();

    return mimeTypeMap.getMimeTypeFromExtension(extension);
}

/**
 * Open a file
 *
 * @param {string} filePath
 * @returns {boolean} whether opening the file succeeded or not
 */
export function openFile(filePath: string): boolean {
    const context = ad.getApplicationContext();
    try {
        // Ensure external storage is available
        if (!isExternalStorageAvailable()) {
            traceWrite(
                `
External storage is unavailable (please check app permissions).
Applications cannot access internal storage of other application on Android (see: https://developer.android.com/guide/topics/data/data-storage).
`,
                traceCategories.Error,
                traceMessageType.error,
            );

            return false;
        }

        // Ensure external storage is available
        if (isExternalStorageReadOnly()) {
            traceWrite("External storage is read only", traceCategories.Error, traceMessageType.error);

            return false;
        }

        // Determine file mimetype & start creating intent
        const mimeType = getMimeTypeNameFromExtension(filePath);
        const intent = new android.content.Intent(android.content.Intent.ACTION_VIEW);
        const chooserIntent = android.content.Intent.createChooser(intent, "Open File...");

        intent.addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK);
        chooserIntent.addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK);

        // Android SDK <28 only requires starting the chooser Intent straight forwardly
        const sdkVersion = parseInt(device.sdkVersion, 10);
        if (sdkVersion && sdkVersion < MIN_URI_SHARE_RESTRICTED_APK_VERSION) {
            traceWrite(
                `detected sdk version ${sdkVersion} (< ${MIN_URI_SHARE_RESTRICTED_APK_VERSION}), using simple openFile`,
                traceCategories.Debug
            );
            intent.setDataAndType(android.net.Uri.fromFile(new java.io.File(filePath)), mimeType);
            context.startActivity(chooserIntent);

            return true;
        }

        traceWrite(
            `detected sdk version ${sdkVersion} (>= ${MIN_URI_SHARE_RESTRICTED_APK_VERSION}), using URI openFile`,
            traceCategories.Debug
        );

        // Android SDK 24+ introduced file system permissions changes that disallow
        // exposing URIs between applications
        //
        // see: https://developer.android.com/reference/android/os/FileUriExposedException
        // see: https://github.com/NativeScript/NativeScript/issues/5661#issuecomment-456405380
        const providerName = `${context.getPackageName()}.provider`;
        traceWrite(`fully-qualified provider name [${providerName}]`, traceCategories.Debug);

        const apkURI = androidx.core.content.FileProvider.getUriForFile(
            context,
            providerName,
            new java.io.File(filePath),
        );

        // Set flags & URI as data type on the view action
        intent.addFlags(android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION);
        chooserIntent.addFlags(android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION);

        // Finish intent setup
        intent.setDataAndType(apkURI, mimeType);

        context.startActivity(chooserIntent);

        return true;
    } catch (err) {
        const msg = err.message ? `: ${err.message}` : "";
        traceWrite(`Error in openFile${msg}`, traceCategories.Error, traceMessageType.error);

        if (msg &&
            msg.includes("Attempt to invoke virtual method") &&
            msg.includes("android.content.pm.ProviderInfo.loadXmlMetaData") &&
            msg.includes("on a null object reference")) {
            // Alert user to possible fix
            traceWrite(
                `
Please ensure you have your manifest correctly configured with the FileProvider.
(see: https://developer.android.com/reference/android/support/v4/content/FileProvider#ProviderDefinition)
`,
                traceCategories.Error,
            );
        }

        return false;
    }
}