"use strict"; /*--------------------------------------------------------------------------------------------- * Copyright (c) Microsoft Corporation. All rights reserved. * Licensed under the MIT License. See License.txt in the project root for license information. *--------------------------------------------------------------------------------------------*/ Object.defineProperty(exports, "__esModule", { value: true }); exports.Mangler = void 0; const ts = require("typescript"); const path = require("path"); const fs = require("fs"); const process_1 = require("process"); class ShortIdent { static _keywords = new Set(['await', 'break', 'case', 'catch', 'class', 'const', 'continue', 'debugger', 'default', 'delete', 'do', 'else', 'export', 'extends', 'false', 'finally', 'for', 'function', 'if', 'import', 'in', 'instanceof', 'let', 'new', 'null', 'return', 'static', 'super', 'switch', 'this', 'throw', 'true', 'try', 'typeof', 'var', 'void', 'while', 'with', 'yield']); static _alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split(''); _value = 0; _isNameTaken; constructor(isNameTaken) { this._isNameTaken = name => ShortIdent._keywords.has(name) || isNameTaken(name); } next() { const candidate = ShortIdent.convert(this._value); this._value++; if (this._isNameTaken(candidate)) { // try again return this.next(); } return candidate; } static convert(n) { const base = this._alphabet.length; let result = ''; do { const rest = n % base; result += this._alphabet[rest]; n = (n / base) | 0; } while (n > 0); return result; } } var FieldType; (function (FieldType) { FieldType[FieldType["Public"] = 0] = "Public"; FieldType[FieldType["Protected"] = 1] = "Protected"; FieldType[FieldType["Private"] = 2] = "Private"; })(FieldType || (FieldType = {})); class ClassData { fileName; node; fields = new Map(); replacements; parent; children; constructor(fileName, node) { // analyse all fields (properties and methods). Find usages of all protected and // private ones and keep track of all public ones (to prevent naming collisions) this.fileName = fileName; this.node = node; const candidates = []; for (const member of node.members) { if (ts.isMethodDeclaration(member)) { // method `foo() {}` candidates.push(member); } else if (ts.isPropertyDeclaration(member)) { // property `foo = 234` candidates.push(member); } else if (ts.isGetAccessor(member)) { // getter: `get foo() { ... }` candidates.push(member); } else if (ts.isSetAccessor(member)) { // setter: `set foo() { ... }` candidates.push(member); } else if (ts.isConstructorDeclaration(member)) { // constructor-prop:`constructor(private foo) {}` for (const param of member.parameters) { if (hasModifier(param, ts.SyntaxKind.PrivateKeyword) || hasModifier(param, ts.SyntaxKind.ProtectedKeyword) || hasModifier(param, ts.SyntaxKind.PublicKeyword) || hasModifier(param, ts.SyntaxKind.ReadonlyKeyword)) { candidates.push(param); } } } } for (const member of candidates) { const ident = ClassData._getMemberName(member); if (!ident) { continue; } const type = ClassData._getFieldType(member); this.fields.set(ident, { type, pos: member.name.getStart() }); } } static _getMemberName(node) { if (!node.name) { return undefined; } const { name } = node; let ident = name.getText(); if (name.kind === ts.SyntaxKind.ComputedPropertyName) { if (name.expression.kind !== ts.SyntaxKind.StringLiteral) { // unsupported: [Symbol.foo] or [abc + 'field'] return; } // ['foo'] ident = name.expression.getText().slice(1, -1); } return ident; } static _getFieldType(node) { if (hasModifier(node, ts.SyntaxKind.PrivateKeyword)) { return 2 /* FieldType.Private */; } else if (hasModifier(node, ts.SyntaxKind.ProtectedKeyword)) { return 1 /* FieldType.Protected */; } else { return 0 /* FieldType.Public */; } } static _shouldMangle(type) { return type === 2 /* FieldType.Private */ || type === 1 /* FieldType.Protected */; } static makeImplicitPublicActuallyPublic(data, reportViolation) { // TS-HACK // A subtype can make an inherited protected field public. To prevent accidential // mangling of public fields we mark the original (protected) fields as public... for (const [name, info] of data.fields) { if (info.type !== 0 /* FieldType.Public */) { continue; } let parent = data.parent; while (parent) { if (parent.fields.get(name)?.type === 1 /* FieldType.Protected */) { const parentPos = parent.node.getSourceFile().getLineAndCharacterOfPosition(parent.fields.get(name).pos); const infoPos = data.node.getSourceFile().getLineAndCharacterOfPosition(info.pos); reportViolation(`'${name}' from ${parent.fileName}:${parentPos.line + 1}`, `${data.fileName}:${infoPos.line + 1}`); parent.fields.get(name).type = 0 /* FieldType.Public */; } parent = parent.parent; } } } static fillInReplacement(data) { if (data.replacements) { // already done return; } // fill in parents first if (data.parent) { ClassData.fillInReplacement(data.parent); } data.replacements = new Map(); const identPool = new ShortIdent(name => { // locally taken if (data._isNameTaken(name)) { return true; } // parents let parent = data.parent; while (parent) { if (parent._isNameTaken(name)) { return true; } parent = parent.parent; } // children if (data.children) { const stack = [...data.children]; while (stack.length) { const node = stack.pop(); if (node._isNameTaken(name)) { return true; } if (node.children) { stack.push(...node.children); } } } return false; }); for (const [name, info] of data.fields) { if (ClassData._shouldMangle(info.type)) { const shortName = identPool.next(); data.replacements.set(name, shortName); } } } // a name is taken when a field that doesn't get mangled exists or // when the name is already in use for replacement _isNameTaken(name) { if (this.fields.has(name) && !ClassData._shouldMangle(this.fields.get(name).type)) { // public field return true; } if (this.replacements) { for (const shortName of this.replacements.values()) { if (shortName === name) { // replaced already (happens wih super types) return true; } } } if (this.node.getSourceFile().identifiers instanceof Map) { // taken by any other usage if (this.node.getSourceFile().identifiers.has(name)) { return true; } } return false; } lookupShortName(name) { let value = this.replacements.get(name); let parent = this.parent; while (parent) { if (parent.replacements.has(name) && parent.fields.get(name)?.type === 1 /* FieldType.Protected */) { value = parent.replacements.get(name) ?? value; } parent = parent.parent; } return value; } // --- parent chaining addChild(child) { this.children ??= []; this.children.push(child); child.parent = this; } } class StaticLanguageServiceHost { projectPath; _cmdLine; _scriptSnapshots = new Map(); constructor(projectPath) { this.projectPath = projectPath; const existingOptions = {}; const parsed = ts.readConfigFile(projectPath, ts.sys.readFile); if (parsed.error) { throw parsed.error; } this._cmdLine = ts.parseJsonConfigFileContent(parsed.config, ts.sys, path.dirname(projectPath), existingOptions); if (this._cmdLine.errors.length > 0) { throw parsed.error; } } getCompilationSettings() { return this._cmdLine.options; } getScriptFileNames() { return this._cmdLine.fileNames; } getScriptVersion(_fileName) { return '1'; } getProjectVersion() { return '1'; } getScriptSnapshot(fileName) { let result = this._scriptSnapshots.get(fileName); if (result === undefined) { const content = ts.sys.readFile(fileName); if (content === undefined) { return undefined; } result = ts.ScriptSnapshot.fromString(content); this._scriptSnapshots.set(fileName, result); } return result; } getCurrentDirectory() { return path.dirname(this.projectPath); } getDefaultLibFileName(options) { return ts.getDefaultLibFilePath(options); } directoryExists = ts.sys.directoryExists; getDirectories = ts.sys.getDirectories; fileExists = ts.sys.fileExists; readFile = ts.sys.readFile; readDirectory = ts.sys.readDirectory; // this is necessary to make source references work. realpath = ts.sys.realpath; } /** * TypeScript2TypeScript transformer that mangles all private and protected fields * * 1. Collect all class fields (properties, methods) * 2. Collect all sub and super-type relations between classes * 3. Compute replacement names for each field * 4. Lookup rename locations for these fields * 5. Prepare and apply edits */ class Mangler { projectPath; log; allClassDataByKey = new Map(); service; constructor(projectPath, log = () => { }) { this.projectPath = projectPath; this.log = log; this.service = ts.createLanguageService(new StaticLanguageServiceHost(projectPath)); } computeNewFileContents() { // STEP: find all classes and their field info const visit = (node) => { if (ts.isClassDeclaration(node) || ts.isClassExpression(node)) { const anchor = node.name ?? node; const key = `${node.getSourceFile().fileName}|${anchor.getStart()}`; if (this.allClassDataByKey.has(key)) { throw new Error('DUPE?'); } this.allClassDataByKey.set(key, new ClassData(node.getSourceFile().fileName, node)); } ts.forEachChild(node, visit); }; for (const file of this.service.getProgram().getSourceFiles()) { if (!file.isDeclarationFile) { ts.forEachChild(file, visit); } } this.log(`done COLLECTING ${this.allClassDataByKey.size} classes`); // STEP: connect sub and super-types const setupParents = (data) => { const extendsClause = data.node.heritageClauses?.find(h => h.token === ts.SyntaxKind.ExtendsKeyword); if (!extendsClause) { // no EXTENDS-clause return; } const info = this.service.getDefinitionAtPosition(data.fileName, extendsClause.types[0].expression.getEnd()); if (!info || info.length === 0) { // throw new Error('SUPER type not found'); return; } if (info.length !== 1) { // inherits from declared/library type return; } const [definition] = info; const key = `${definition.fileName}|${definition.textSpan.start}`; const parent = this.allClassDataByKey.get(key); if (!parent) { // throw new Error(`SUPER type not found: ${key}`); return; } parent.addChild(data); }; for (const data of this.allClassDataByKey.values()) { setupParents(data); } // STEP: make implicit public (actually protected) field really public const violations = new Map(); for (const data of this.allClassDataByKey.values()) { ClassData.makeImplicitPublicActuallyPublic(data, (what, why) => { const arr = violations.get(what); if (arr) { arr.push(why); } else { violations.set(what, [why]); } }); } for (const [why, whys] of violations) { this.log(`WARN: ${why} became PUBLIC because of: ${whys.join(' , ')}`); } // STEP: compute replacement names for each class for (const data of this.allClassDataByKey.values()) { ClassData.fillInReplacement(data); } this.log(`done creating REPLACEMENTS`); const editsByFile = new Map(); const appendEdit = (fileName, edit) => { const edits = editsByFile.get(fileName); if (!edits) { editsByFile.set(fileName, [edit]); } else { edits.push(edit); } }; for (const data of this.allClassDataByKey.values()) { if (hasModifier(data.node, ts.SyntaxKind.DeclareKeyword)) { continue; } fields: for (const [name, info] of data.fields) { if (!ClassData._shouldMangle(info.type)) { continue fields; } // TS-HACK: protected became public via 'some' child // and because of that we might need to ignore this now let parent = data.parent; while (parent) { if (parent.fields.get(name)?.type === 0 /* FieldType.Public */) { continue fields; } parent = parent.parent; } const newText = data.lookupShortName(name); const locations = this.service.findRenameLocations(data.fileName, info.pos, false, false, true) ?? []; for (const loc of locations) { appendEdit(loc.fileName, { newText: (loc.prefixText || '') + newText + (loc.suffixText || ''), offset: loc.textSpan.start, length: loc.textSpan.length }); } } } this.log(`done preparing EDITS for ${editsByFile.size} files`); // STEP: apply all rename edits (per file) const result = new Map(); let savedBytes = 0; for (const item of this.service.getProgram().getSourceFiles()) { let newFullText; const edits = editsByFile.get(item.fileName); if (!edits) { // just copy newFullText = item.getFullText(); } else { // apply renames edits.sort((a, b) => b.offset - a.offset); const characters = item.getFullText().split(''); let lastEdit; for (const edit of edits) { if (lastEdit) { if (lastEdit.offset === edit.offset) { // if (lastEdit.length !== edit.length || lastEdit.newText !== edit.newText) { this.log('OVERLAPPING edit', item.fileName, edit.offset, edits); throw new Error('OVERLAPPING edit'); } else { continue; } } } lastEdit = edit; const removed = characters.splice(edit.offset, edit.length, edit.newText); savedBytes += removed.length - edit.newText.length; } newFullText = characters.join(''); } result.set(item.fileName, newFullText); } this.log(`DONE saved ${savedBytes / 1000}kb`); return result; } } exports.Mangler = Mangler; // --- ast utils function hasModifier(node, kind) { const modifiers = ts.canHaveModifiers(node) ? ts.getModifiers(node) : undefined; return Boolean(modifiers?.find(mode => mode.kind === kind)); } async function _run() { const projectPath = path.join(__dirname, '../../src/tsconfig.json'); const projectBase = path.dirname(projectPath); const newProjectBase = path.join(path.dirname(projectBase), path.basename(projectBase) + '-mangle'); for await (const [fileName, contents] of new Mangler(projectPath, console.log).computeNewFileContents()) { const newFilePath = path.join(newProjectBase, path.relative(projectBase, fileName)); await fs.promises.mkdir(path.dirname(newFilePath), { recursive: true }); await fs.promises.writeFile(newFilePath, contents); } } if (__filename === process_1.argv[1]) { _run(); } //# 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