initial commit of the package

Author: mnsrulz

.github/workflows/npmpublish.yml

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+# This workflow will run tests using node and then publish a package to GitHub Packages when a release is created
+# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
+
+name: Node.js Package
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: npm ci      
+
+  publish-npm:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}

.npmignore

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+src/
+*.map
+.github
+.vscode
+tsconfig.json

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "program": "${workspaceFolder}\\dist\\jsunpack.js",
+            "preLaunchTask": "npm: compile",
+            "outFiles": [
+                "${workspaceFolder}/**/*.js"
+            ]
+        }
+    ]
+}

package-lock.json

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+{
+  "name": "unpacker",
+  "version": "0.3.0-alpha-1",
+  "description": "A nodejs library to unpack p.a.c.k.e.d javascript code.",
+  "main": "dist\\main.js",
+  "scripts": {    
+    "build": "tsc",
+    "prepublishOnly": "tsc"
+  },
+  "author": "mnsrulz",
+  "license": "MIT",
+  "dependencies": {},
+  "devDependencies": {
+    "@types/node": "^14.0.27",
+    "typescript": "^3.9.7"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mnsrulz/unpacker.git"
+  }
+}

package.json

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+export class Unpacker {
+  detect(source: string) {
+    /* Detects whether `source` is P.A.C.K.E.R. coded. */
+    return source.replace(" ", "").startsWith("eval(function(p,a,c,k,e,");
+  }
+
+  unpack(source: string) {
+    /* Unpacks P.A.C.K.E.R. packed js code. */
+    let { payload, symtab, radix, count } = _filterargs(source);
+
+    if (count != symtab.length) {
+      throw Error("Malformed p.a.c.k.e.r. symtab.");
+    }
+
+    let unbase: Unbaser;
+    try {
+      unbase = new Unbaser(radix);
+    } catch (e) {
+      throw Error("Unknown p.a.c.k.e.r. encoding.");
+    }
+
+    function lookup(match: string): string {
+      /* Look up symbols in the synthetic symtab. */
+      const word = match;
+      let word2: string;
+      if (radix == 1) {
+        //throw Error("symtab unknown");
+        word2 = symtab[parseInt(word)];
+      } else {
+        word2 = symtab[unbase.unbase(word)];
+      }
+      return word2 || word;
+    }
+
+    source = payload.replace(/\b\w+\b/g, lookup);
+    return _replacestrings(source);
+
+
+    function _filterargs(source: string) {
+      /* Juice from a source file the four args needed by decoder. */
+      const juicers = [
+        /}\('(.*)', *(\d+|\[\]), *(\d+), *'(.*)'\.split\('\|'\), *(\d+), *(.*)\)\)/,
+        /}\('(.*)', *(\d+|\[\]), *(\d+), *'(.*)'\.split\('\|'\)/,
+      ];
+      for (const juicer of juicers) {
+        //const args = re.search(juicer, source, re.DOTALL);
+        const args = juicer.exec(source);
+        if (args) {
+          let a = args;
+          if (a[2] == "[]") {
+            //don't know what it is
+            // a = list(a);
+            // a[1] = 62;
+            // a = tuple(a);
+          }
+          try {
+            return {
+              payload: a[1],
+              symtab: a[4].split("|"),
+              radix: parseInt(a[2]),
+              count: parseInt(a[3]),
+            };
+          } catch (ValueError) {
+            throw Error("Corrupted p.a.c.k.e.r. data.");
+          }
+        }
+      }
+      throw Error(
+        "Could not make sense of p.a.c.k.e.r data (unexpected code structure)",
+      );
+    }
+
+    function _replacestrings(source: string): string {
+      /* Strip string lookup table (list) and replace values in source. */
+      /* Need to work on this. */
+      return source;
+    }
+  }
+}
+
+class Unbaser {
+  /* Functor for a given base. Will efficiently convert
+    strings to natural numbers. */
+  protected ALPHABET: Record<number, string> = {
+    62: "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
+    95:
+      "' !\"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~'",
+  };
+  protected base: number;
+  protected dictionary: Record<string, number> = {};
+
+  constructor(base: number) {
+    this.base = base;
+
+    // fill elements 37...61, if necessary
+    if (36 < base && base < 62) {
+      this.ALPHABET[base] = this.ALPHABET[base] ||
+        this.ALPHABET[62].substr(0, base);
+    }
+    // If base can be handled by int() builtin, let it do it for us
+    if (2 <= base && base <= 36) {
+      this.unbase = (value) => parseInt(value, base);
+    } else {
+      // Build conversion dictionary cache
+      try {
+        [...this.ALPHABET[base]].forEach((cipher, index) => {
+          this.dictionary[cipher] = index;
+        });
+      } catch (er) {
+        throw Error("Unsupported base encoding.");
+      }
+      this.unbase = this._dictunbaser;
+    }
+  }
+
+  public unbase: (a: string) => number;
+
+  private _dictunbaser(value: string): number {
+    /* Decodes a value to an integer. */
+    let ret = 0;
+    [...value].reverse().forEach((cipher, index) => {
+      ret = ret + ((this.base ** index) * this.dictionary[cipher]);
+    });
+    return ret;
+  }
+}

src/main.ts

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+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "ES6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "CommonJS",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./dist",                        /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}