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Updating shims for constrained environments (#944, #993).

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Richard Moore 2020-08-27 14:22:58 -04:00
parent 5fcd03f27e
commit 8abdbbbf63
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4 changed files with 161 additions and 2578 deletions
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1412
packages/shims/dist/index.js vendored
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packages/shims/dist/index.min.js vendored
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1158
packages/shims/src/es6-promise.auto.js
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packages/shims/src/index.js
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@ -1,80 +1,123 @@
'use strict';
var shims = [];
(function() {
// Shim String.prototype.normalize
try {
var missing = [];
var shims = [];
// Some platforms are missing certain normalization forms
var forms = ["NFD", "NFC", "NFKD", "NFKC"];
for (var i = 0; i < forms.length; i++) {
try {
if ("test".normalize(forms[i]) !== "test") {
throw new Error("failed to normalize");
// Shim String.prototype.normalize
try {
var missing = [];
// Some platforms are missing certain normalization forms
var forms = ["NFD", "NFC", "NFKD", "NFKC"];
for (var i = 0; i < forms.length; i++) {
try {
if ("test".normalize(forms[i]) !== "test") {
throw new Error("failed to normalize");
}
} catch(error) {
missing.push(forms[i]);
}
} catch(error) {
missing.push(forms[i]);
}
if (missing.length) {
shims.push("String.prototype.normalize (missing: " + missing.join(", ") + ")");
throw new Error('bad normalize');
}
// Some platforms have a native normalize, but it is broken; so we force our shim
if (String.fromCharCode(0xe9).normalize('NFD') !== String.fromCharCode(0x65, 0x0301)) {
shims.push("String.prototype.normalize (broken)");
throw new Error('bad normalize');
}
} catch (error) {
var unorm = require('./unorm.js');
String.prototype.normalize = function(form) {
var func = unorm[(form || 'NFC').toLowerCase()];
if (!func) { throw new RangeError('invalid form - ' + form); }
return func(this);
}
}
if (missing.length) {
shims.push("String.prototype.normalize (missing: " + missing.join(", ") + ")");
throw new Error('bad normalize');
// Shim atob and btoa
var base64 = require('./base64.js');
if (!global.atob) {
shims.push("atob");
global.atob = base64.atob;
}
if (!global.btoa) {
shims.push("btoa");
global.btoa = base64.btoa;
}
// Some platforms have a native normalize, but it is broken; so we force our shim
if (String.fromCharCode(0xe9).normalize('NFD') !== String.fromCharCode(0x65, 0x0301)) {
shims.push("String.prototype.normalize (broken)");
throw new Error('bad normalize');
// Shim ArrayBuffer.isView
if (!ArrayBuffer.isView) {
shims.push("ArrayBuffer.isView");
ArrayBuffer.isView = function(obj) {
// @TODO: This should probably check various instanceof aswell
return !!(obj.buffer);
}
}
} catch (error) {
var unorm = require('./unorm.js');
String.prototype.normalize = function(form) {
var func = unorm[(form || 'NFC').toLowerCase()];
if (!func) { throw new RangeError('invalid form - ' + form); }
return func(this);
// Shim nextTick
if (!global.nextTick) {
shims.push("nextTick");
global.nextTick = function (callback) { setTimeout(callback, 0); }
}
}
// Shim atob and btoa
var base64 = require('./base64.js');
if (!global.atob) {
shims.push("atob");
global.atob = base64.atob;
}
if (!global.btoa) {
shims.push("btoa");
global.btoa = base64.btoa;
}
// Shim Promise
// @TODO: Check first?
if (window.Promise == null) {
var promise = require('./es6-promise.auto.js');
}
// Shim ArrayBuffer.isView
if (!ArrayBuffer.isView) {
shims.push("ArrayBuffer.isView");
ArrayBuffer.isView = function(obj) {
// @TODO: This should probably check various instanceof aswell
return !!(obj.buffer);
// Shim crypto.getRandomValues
// @TOOD: Investigate: https://github.com/brix/crypto-js/issues/7
if (!global.crypto) { global.crypto = { }; }
if (!global.crypto.getRandomValues) {
shims.push("crypto.getRandomValues");
console.log("WARNING: This environment is missing a secure random source; generated private keys may be at risk, think VERY carefully about not adding a better secure source.");
global.crypto.getRandomValues = function(buffer) {
var start = Math.floor((new Date()).getTime()) % buffer.length;
for (var i = 0; i < buffer.length; i++) {
buffer[(start + i) % buffer.length] = Math.floor(Math.random() * 256);
}
}
}
}
// Shim nextTick
if (!global.nextTick) {
shims.push("nextTick");
global.nextTick = function (callback) { setTimeout(callback, 0); }
}
// Shim FileReader.readAsArrayBuffer
// https://github.com/facebook/react-native/issues/21209
try {
var fr = new FileReader();
try {
fr.readAsArrayBuffer(new Blob([ "hello" ], { type: "text/plain" }));
return;
} catch (error) { }
if (shims.length) {
console.log("Shims Injected:");
for (var i = 0; i < shims.length; i++) {
console.log(' - ' + shims[i]);
shims.push("FileReader.prototype.readAsArrayBuffer");
FileReader.prototype.readAsArrayBuffer = function (blob) {
if (this.readyState === this.LOADING) throw new Error("InvalidStateError");
this._setReadyState(this.LOADING);
this._result = null;
this._error = null;
var fr = new FileReader();
fr.onloadend = () => {
var content = atob(fr.result.split(",").pop().trim());
var buffer = new ArrayBuffer(content.length);
var view = new Uint8Array(buffer);
view.set(Array.from(content).map(c => c.charCodeAt(0)));
this._result = buffer;
this._setReadyState(this.DONE);
};
fr.readAsDataURL(blob);
}
} catch (error) {
console.log("Missing FileReader; unsupported platform");
}
}
// @TOOD: Add crypto.rand?
// - https://github.com/brix/crypto-js/issues/7
if (shims.length) {
console.log("Shims Injected:");
for (var i = 0; i < shims.length; i++) {
console.log(' - ' + shims[i]);
}
}
})();