working

lib/resolveAssetSource.js

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule resolveAssetSource
+ * @flow
+ *
+ * Resolves an asset into a `source` for `Image`.
+ *
+ * Hooked by @tdzl2003 for react-native-pushy
+ */
+'use strict';
+
+var AssetRegistry = require('react-native/Libraries/Image/AssetRegistry');
+var PixelRatio = require('react-native/Libraries/Utilities/PixelRatio');
+var Platform = require('react-native/Libraries/Utilities/Platform');
+var NativeModules = require('react-native/Libraries/BatchedBridge/BatchedBridgedModules/NativeModules.js');
+var SourceCode = NativeModules.SourceCode;
+
+var _serverURL, _offlinePath;
+
+function getDevServerURL() {
+  if (_serverURL === undefined) {
+    var scriptURL = SourceCode.scriptURL;
+    var match = scriptURL && scriptURL.match(/^https?:\/\/.*?\//);
+    if (match) {
+      // Bundle was loaded from network
+      _serverURL = match[0];
+    } else {
+      // Bundle was loaded from file
+      _serverURL = null;
+    }
+  }
+
+  return _serverURL;
+}
+
+function getOfflinePath() {
+  if (_offlinePath === undefined) {
+    var scriptURL = SourceCode.scriptURL;
+    var match = scriptURL && scriptURL.match(/^file:\/\/(\/.*\/)/);
+    if (match) {
+      _offlinePath = match[1];
+    } else {
+      _offlinePath = '';
+    }
+  }
+
+  return _offlinePath;
+}
+
+/**
+ * Returns the path at which the asset can be found in the archive
+ */
+function getPathInArchive(asset) {
+  if (Platform.OS === 'android') {
+    var assetDir = getBasePath(asset);
+    // E.g. 'assets_awesomemodule_icon'
+    // The Android resource system picks the correct scale.
+    return (assetDir + '/' + asset.name)
+      .toLowerCase()
+      .replace(/\//g, '_')           // Encode folder structure in file name
+      .replace(/([^a-z0-9_])/g, '')  // Remove illegal chars
+      .replace(/^assets_/, '');      // Remove "assets_" prefix
+  } else {
+    // E.g. 'assets/AwesomeModule/icon@2x.png'
+    return getOfflinePath() + getScaledAssetPath(asset);
+  }
+}
+
+/**
+ * Returns an absolute URL which can be used to fetch the asset
+ * from the devserver
+ */
+function getPathOnDevserver(devServerUrl, asset) {
+  return devServerUrl + getScaledAssetPath(asset) + '?platform=' + Platform.OS +
+    '&hash=' + asset.hash;
+}
+
+/**
+ * Returns a path like 'assets/AwesomeModule'
+ */
+function getBasePath(asset) {
+  // TODO(frantic): currently httpServerLocation is used both as
+  // path in http URL and path within IPA. Should we have zipArchiveLocation?
+  var path = asset.httpServerLocation;
+  if (path[0] === '/') {
+    path = path.substr(1);
+  }
+  return path;
+}
+
+/**
+ * Returns a path like 'assets/AwesomeModule/icon@2x.png'
+ */
+function getScaledAssetPath(asset) {
+  var scale = pickScale(asset.scales, PixelRatio.get());
+  var scaleSuffix = scale === 1 ? '' : '@' + scale + 'x';
+  var assetDir = getBasePath(asset);
+  return assetDir + '/' + asset.name + scaleSuffix + '.' + asset.type;
+}
+
+function pickScale(scales, deviceScale) {
+  // Packager guarantees that `scales` array is sorted
+  for (var i = 0; i < scales.length; i++) {
+    if (scales[i] >= deviceScale) {
+      return scales[i];
+    }
+  }
+
+  // If nothing matches, device scale is larger than any available
+  // scales, so we return the biggest one. Unless the array is empty,
+  // in which case we default to 1
+  return scales[scales.length - 1] || 1;
+}
+
+function resolveAssetSource(source){
+  if (typeof source === 'object') {
+    return source;
+  }
+
+  var asset = AssetRegistry.getAssetByID(source);
+  if (asset) {
+    return assetToImageSource(asset);
+  }
+
+  return null;
+}
+
+function assetToImageSource(asset){
+  var devServerURL = getDevServerURL();
+  return {
+    __packager_asset: true,
+    width: asset.width,
+    height: asset.height,
+    uri: devServerURL ? getPathOnDevserver(devServerURL, asset) : getPathInArchive(asset),
+    scale: pickScale(asset.scales, PixelRatio.get()),
+  };
+}
+
+module.exports = resolveAssetSource;
+module.exports.pickScale = pickScale;