1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* Copyright (C) 2023 Yomitan Authors
* Copyright (C) 2020-2022 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
const fs = require('fs');
const vm = require('vm');
const path = require('path');
const assert = require('assert');
const crypto = require('crypto');
function getContextEnvironmentRecords(context, names) {
// Enables export of values from the declarative environment record
if (!Array.isArray(names) || names.length === 0) {
return [];
}
let scriptSource = '(() => {\n "use strict";\n const results = [];';
for (const name of names) {
scriptSource += `\n try { results.push(${name}); } catch (e) { results.push(void 0); }`;
}
scriptSource += '\n return results;\n})();';
const script = new vm.Script(scriptSource, {filename: 'getContextEnvironmentRecords'});
const contextHasNames = Object.prototype.hasOwnProperty.call(context, 'names');
const contextNames = context.names;
context.names = names;
const results = script.runInContext(context, {});
if (contextHasNames) {
context.names = contextNames;
} else {
delete context.names;
}
return Array.from(results);
}
function isDeepStrictEqual(val1, val2) {
if (val1 === val2) { return true; }
if (Array.isArray(val1)) {
if (Array.isArray(val2)) {
return isArrayDeepStrictEqual(val1, val2);
}
} else if (typeof val1 === 'object' && val1 !== null) {
if (typeof val2 === 'object' && val2 !== null) {
return isObjectDeepStrictEqual(val1, val2);
}
}
return false;
}
function isArrayDeepStrictEqual(val1, val2) {
const ii = val1.length;
if (ii !== val2.length) { return false; }
for (let i = 0; i < ii; ++i) {
if (!isDeepStrictEqual(val1[i], val2[i])) {
return false;
}
}
return true;
}
function isObjectDeepStrictEqual(val1, val2) {
const keys1 = Object.keys(val1);
const keys2 = Object.keys(val2);
if (keys1.length !== keys2.length) { return false; }
const keySet = new Set(keys1);
for (const key of keys2) {
if (!keySet.delete(key)) { return false; }
}
for (const key of keys1) {
if (!isDeepStrictEqual(val1[key], val2[key])) {
return false;
}
}
const tag1 = Object.prototype.toString.call(val1);
const tag2 = Object.prototype.toString.call(val2);
if (tag1 !== tag2) { return false; }
return true;
}
function deepStrictEqual(actual, expected) {
try {
// This will fail on prototype === comparison on cross context objects
assert.deepStrictEqual(actual, expected);
} catch (e) {
if (!isDeepStrictEqual(actual, expected)) {
throw e;
}
}
}
function createURLClass() {
const BaseURL = URL;
const result = function URL(url) {
const u = new BaseURL(url);
this.hash = u.hash;
this.host = u.host;
this.hostname = u.hostname;
this.href = u.href;
this.origin = u.origin;
this.password = u.password;
this.pathname = u.pathname;
this.port = u.port;
this.protocol = u.protocol;
this.search = u.search;
this.searchParams = u.searchParams;
this.username = u.username;
};
return result;
}
class VM {
constructor(context={}) {
context.URL = createURLClass();
context.crypto = {
getRandomValues: (array) => {
const buffer = crypto.randomBytes(array.byteLength);
buffer.copy(array);
return array;
}
};
this._context = vm.createContext(context);
this._assert = {
deepStrictEqual
};
}
get context() {
return this._context;
}
get assert() {
return this._assert;
}
get(names) {
if (typeof names === 'string') {
return getContextEnvironmentRecords(this._context, [names])[0];
} else if (Array.isArray(names)) {
return getContextEnvironmentRecords(this._context, names);
} else {
throw new Error('Invalid argument');
}
}
set(values) {
if (typeof values === 'object' && values !== null) {
Object.assign(this._context, values);
} else {
throw new Error('Invalid argument');
}
}
execute(fileNames) {
const single = !Array.isArray(fileNames);
if (single) {
fileNames = [fileNames];
}
const results = [];
for (const fileName of fileNames) {
const absoluteFileName = path.resolve(__dirname, '..', 'ext', fileName);
const source = fs.readFileSync(absoluteFileName, {encoding: 'utf8'});
const script = new vm.Script(source, {filename: absoluteFileName});
results.push(script.runInContext(this._context, {}));
}
return single ? results[0] : results;
}
}
module.exports = {
VM
};
|