1 | 'use strict';
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2 |
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3 | import { NativeModules, PixelRatio, Platform } from 'react-native';
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4 | import AssetRegistry from 'react-native/Libraries/Image/AssetRegistry';
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5 | import AssetSourceResolver from 'react-native/Libraries/Image/AssetSourceResolver';
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6 | import resolveAssetSource from 'react-native/Libraries/Image/resolveAssetSource';
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7 |
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8 | import Constants from './Constants';
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9 |
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10 | const FS = NativeModules.ExponentFileSystem;
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11 |
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12 |
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13 |
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14 |
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15 | const pickScale = meta => {
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16 |
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17 |
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18 |
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19 | const scale =
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20 | meta.scales.length > 1
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21 | ? AssetSourceResolver.pickScale(meta.scales, PixelRatio.get())
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22 | : 1;
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23 | const index = meta.scales.findIndex(s => s === scale);
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24 | const hash = meta.fileHashes[index] || meta.fileHashes[0];
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25 |
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26 | const suffix =
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27 | '/' +
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28 | meta.name +
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29 | (scale === 1 ? '' : '@' + scale + 'x') +
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30 | '.' +
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31 | meta.type +
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32 | '?platform=' +
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33 | Platform.OS +
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34 | '&hash=' +
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35 | meta.hash;
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36 |
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37 |
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38 | if (meta.uri) {
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39 | return {
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40 | uri: meta.uri,
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41 | hash,
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42 | };
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43 | }
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44 |
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45 | if (/^https?:/.test(meta.httpServerLocation)) {
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46 |
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47 |
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48 | return {
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49 | uri: meta.httpServerLocation + suffix,
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50 | hash,
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51 | };
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52 | }
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53 |
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54 | if (Constants.manifest.xde) {
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55 |
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56 | return {
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57 | uri:
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58 | Constants.manifest.bundleUrl.match(/^https?:\/\/.*?\//)[0] +
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59 | meta.httpServerLocation.replace(/^\/?/, '') +
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60 | suffix,
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61 | hash,
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62 | };
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63 | }
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64 |
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65 |
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66 | return {
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67 | uri: 'https://d1wp6m56sqw74a.cloudfront.net/~assets/' + hash,
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68 | hash,
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69 | };
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70 | };
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71 |
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72 | export default class Asset {
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73 | static byModule = {};
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74 |
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75 | constructor({ name, type, hash, uri, width, height }) {
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76 | this.name = name;
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77 | this.type = type;
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78 | this.hash = hash;
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79 | this.uri = uri;
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80 | if (typeof width === 'number') {
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81 | this.width = width;
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82 | }
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83 | if (typeof height === 'number') {
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84 | this.height = height;
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85 | }
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86 |
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87 | this.downloading = false;
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88 | this.downloaded = false;
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89 | this.downloadCallbacks = [];
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90 | }
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91 |
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92 | static loadAsync(moduleId) {
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93 | let moduleIds = typeof moduleId === 'number' ? [moduleId] : moduleId;
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94 | return Promise.all(moduleIds.map(m => Asset.fromModule(m).downloadAsync()));
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95 | }
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96 |
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97 | static fromModule(moduleId) {
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98 | if (Asset.byModule[moduleId]) {
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99 | return Asset.byModule[moduleId];
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100 | }
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101 |
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102 |
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103 |
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104 | const meta = AssetRegistry.getAssetByID(moduleId);
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105 | meta.moduleId = moduleId;
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106 | const { uri, hash } = pickScale(meta);
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107 |
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108 | const asset = new Asset({
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109 | name: meta.name,
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110 | type: meta.type,
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111 | hash,
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112 | uri,
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113 | width: meta.width,
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114 | height: meta.height,
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115 | });
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116 | Asset.byModule[moduleId] = asset;
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117 | return asset;
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118 | }
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119 |
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120 | async downloadAsync() {
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121 | if (this.downloaded) {
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122 | return;
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123 | }
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124 | if (this.downloading) {
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125 | await new Promise((resolve, reject) =>
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126 | this.downloadCallbacks.push({ resolve, reject })
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127 | );
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128 | return;
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129 | }
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130 | this.downloading = true;
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131 |
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132 | try {
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133 | const localUri = `${FS.cacheDirectory}ExponentAsset-${this.hash}.${this
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134 | .type}`;
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135 | let exists, md5;
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136 | ({ exists, md5 } = await FS.getInfoAsync(localUri, {
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137 | cache: true,
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138 | md5: true,
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139 | }));
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140 | if (!exists || md5 !== this.hash) {
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141 | ({ md5 } = await FS.downloadAsync(this.uri, localUri, {
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142 | cache: true,
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143 | md5: true,
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144 | }));
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145 | if (md5 !== this.hash) {
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146 | throw new Error(
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147 | `Downloaded file for asset '${this.name}.${this.type}' ` +
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148 | `Located at ${this.uri} ` +
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149 | `failed MD5 integrity check`
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150 | );
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151 | }
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152 | }
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153 | this.localUri = localUri;
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154 | this.downloaded = true;
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155 | this.downloadCallbacks.forEach(({ resolve }) => resolve());
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156 | } catch (e) {
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157 | this.downloadCallbacks.forEach(({ reject }) => reject(e));
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158 | throw e;
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159 | } finally {
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160 | this.downloading = false;
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161 | this.downloadCallbacks = [];
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162 | }
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163 | }
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164 | }
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165 |
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166 |
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167 | resolveAssetSource.setCustomSourceTransformer(resolver => {
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168 | if (!resolver.asset.moduleId) {
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169 | return resolver.fromSource(pickScale(resolver.asset).uri);
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170 | }
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171 | const asset = Asset.fromModule(resolver.asset.moduleId);
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172 | return resolver.fromSource(asset.downloaded ? asset.localUri : asset.uri);
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173 | });
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