feat: add ghoulscript

Author: adenvt

.gitignore

@@ -1,13 +1,131 @@
-.yarn/*
-!.yarn/patches
-!.yarn/plugins
-!.yarn/releases
-!.yarn/sdks
-!.yarn/versions
-
-# Swap the comments on the following lines if you wish to use zero-installs
-# In that case, don't forget to run `yarn config set enableGlobalCache false`!
-# Documentation here: https://yarnpkg.com/features/caching#zero-installs
-
-#!.yarn/cache
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
 .pnp.*
+.DS_Store

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "packages/gs-wasm/ghostpdl"]
+	path = packages/ghostscript/ghostpdl
+	url = git://git.ghostscript.com/ghostpdl.git

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

package.json

@@ -1,4 +1,8 @@
 {
-  "name": "ghoulscript",
-  "packageManager": "yarn@4.2.2"
+  "name": "@privyid/ghoulscript-monorepo",
+  "packageManager": "yarn@4.2.2",
+  "private": true,
+  "workspaces": [
+    "packages/*"
+  ]
 }

packages/ghoulscript/README.md

@@ -0,0 +1 @@
+# ghoulscript

packages/ghoulscript/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@privyid/ghoulscript",
+  "packageManager": "yarn@4.2.2",
+  "scripts": {
+    "build": "unbuild",
+    "test": "deno run ./tests/sample.ts"
+  },
+  "devDependencies": {
+    "@types/node": "^20.14.0",
+    "jiti": "^1.21.0",
+    "typescript": "^5.4.5",
+    "unbuild": "^2.0.0"
+  },
+  "dependencies": {
+    "@privyid/ghostscript": "workspace:^",
+    "defu": "^6.1.4"
+  }
+}

packages/ghoulscript/src/index.ts

@@ -0,0 +1,112 @@
+import useGS from '@privyid/ghostscript'
+import { defu } from 'defu'
+
+interface CompressOptions {
+  password?: string,
+  pdfSettings: 'screen' | 'ebook' | 'printer' | 'prepress' | 'default',
+  fastWebView: boolean,
+  compatibilityLevel: string,
+  noTransparency: boolean,
+  ownerPassword?: string,
+  userPassword?: string,
+  keepPassword: boolean,
+}
+
+async function createPDF (inputs: Array<string | ArrayBufferView>, option: Partial<CompressOptions> = {}): Promise<Uint8Array> {
+  const gs   = await useGS()
+  const opts = defu<CompressOptions, [CompressOptions]>(option, {
+    pdfSettings       : 'screen',
+    compatibilityLevel: '1.4',
+    fastWebView       : true,
+    noTransparency    : true,
+    keepPassword      : true,
+  })
+
+  const args = [
+    '-dQUIET',
+    '-dNOPAUSE',
+    '-dBATCH',
+    '-dSAFER',
+    '-sDEVICE=pdfwrite',
+  ]
+
+  let userPassword  = opts.userPassword
+  let ownerPassword = opts.ownerPassword ?? opts.userPassword
+
+  if (opts.password) {
+    args.push(`-sPDFPassword=${opts.password}`)
+
+    if (opts.keepPassword) {
+      userPassword  ??= opts.password
+      ownerPassword ??= opts.password
+    }
+  }
+
+  if (userPassword) {
+    args.push(`-sUserPassword=${userPassword}`)
+    args.push(`-sOwnerPassword=${ownerPassword}`)
+  }
+
+  if (opts.noTransparency)
+    args.push(`-dNOTRANSPARENCY`)
+
+  args.push(`-dCompatibilityLevel=${opts.compatibilityLevel}`)
+  args.push(`-sColorConversionStrategy=RGB`)
+  args.push(`-dPDFSETTINGS=/${opts.pdfSettings}`)
+  args.push(`-dFastWebView=${opts.fastWebView}`)
+  args.push(`-sOutputFile=./output.pdf`)
+
+  inputs.forEach((input, i) => {
+    const inputFilename = `./input-${i}`
+
+    gs.FS.writeFile(inputFilename, input)
+    args.push(inputFilename)
+  })
+
+  await gs.callMain(args)
+
+  return gs.FS.readFile('./output.pdf', { encoding: 'binary' })
+}
+
+export async function optimizePDF (input: string | ArrayBufferView, option: Partial<CompressOptions> = {}) {
+  return createPDF([input], option)
+}
+
+export async function combinePDF (inputs: Array<string | ArrayBufferView>, option: Partial<CompressOptions> = {}) {
+  return createPDF(inputs, option)
+}
+
+export async function addPassword (input: string | ArrayBufferView, ownerPassword: string, userPassword: string = ownerPassword) {
+  return createPDF([input], {
+    ownerPassword,
+    userPassword,
+  })
+}
+
+export async function removePassword (input: string | ArrayBufferView, password: string) {
+  return createPDF([input], { keepPassword: false, password: password })
+}
+
+
+export async function renderPageAsImage (input: string | ArrayBufferView, pageNumber: number = 1) {
+  const gs   = await useGS()
+  const args = [
+    '-dQUIET',
+    '-dNOPAUSE',
+    '-dBATCH',
+    '-dSAFER',
+    '-sDEVICE=jpeg',
+    `-sPageList=${pageNumber}`,
+    `-r96`,
+    '-dTextAlphaBits=4',
+    '-dGraphicsAlphaBits=4',
+    `-sOutputFile=./output.jpg`,
+    'input',
+  ]
+
+  gs.FS.writeFile('./input', input)
+
+  await gs.callMain(args)
+
+  return gs.FS.readFile('./output.jpg', { encoding: 'binary' })
+}