viewer: use esbuild to bundle pdf viewer and worker

This improves maintainability:
1. no need to hardcode each script file in Android code
2. no need to symlink pdf.js and pdf.worker.js
3. adds sourcemaps in debug builds to help debug some pdf.js related
   issues

.eslintrc.json

@@ -30,11 +30,10 @@
         ]
     },
     "globals": {
-        "pdfjsLib": "readonly",
         "channel": "readonly"
     },
     "ignorePatterns": [
-        "pdf.js",
+        "/app/src/*/assets/viewer",
-        "pdf.worker.js"
+        "build/"
     ]
 }

.gitignore

@@ -7,3 +7,4 @@ keystore.properties
 /.idea
 /releases
 /node_modules
+/app/src/*/assets/viewer

app/src/main/assets/pdf.js

@@ -1 +0,0 @@
-../../../../node_modules/pdfjs-dist/build/pdf.min.js

app/src/main/assets/pdf.worker.js

@@ -1 +0,0 @@
-../../../../node_modules/pdfjs-dist/build/pdf.worker.min.js

app/src/main/java/app/grapheneos/pdfviewer/PdfViewer.java

@@ -309,7 +309,7 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
                     return new WebResourceResponse("application/pdf", null, mInputStream);
                 }
 
-                if ("/viewer.html".equals(path)) {
+                if ("/viewer/index.html".equals(path)) {
                     final WebResourceResponse response = fromAsset("text/html", path);
                     HashMap<String, String> headers = new HashMap<>();
                     headers.put("Content-Security-Policy", CONTENT_SECURITY_POLICY);
@@ -319,11 +319,11 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
                     return response;
                 }
 
-                if ("/viewer.css".equals(path)) {
+                if ("/viewer/main.css".equals(path)) {
                     return fromAsset("text/css", path);
                 }
 
-                if ("/viewer.js".equals(path) || "/pdf.js".equals(path) || "/pdf.worker.js".equals(path)) {
+                if ("/viewer/js/index.js".equals(path) || "/viewer/js/worker.js".equals(path)) {
                     return fromAsset("application/javascript", path);
                 }
 
@@ -520,7 +520,7 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
         mDocumentState = 0;
         showSystemUi();
         invalidateOptionsMenu();
-        binding.webview.loadUrl("https://localhost/viewer.html");
+        binding.webview.loadUrl("https://localhost/viewer/index.html");
     }
 
     public void loadPdfWithPassword(final String password) {

package-lock.json

@@ -5,6 +5,7 @@
   "packages": {
     "": {
       "devDependencies": {
+        "esbuild": "^0.19.2",
         "eslint": "^8.49.0",
         "pdfjs-dist": "^3.10.111"
       }
@@ -18,6 +19,358 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.19.2.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.19.2.tgz",
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+        "arm64"
+      ],
+      "dev": true,
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+        "android"
+      ],
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+      }
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+        "ia32"
+      ],
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+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/win32-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.19.2.tgz",
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+      "cpu": [
+        "x64"
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+      "dev": true,
+      "optional": true,
+      "os": [
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+      "engines": {
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     "node_modules/@eslint-community/eslint-utils": {
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@@ -465,6 +818,43 @@
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+      "dev": true,
+      "hasInstallScript": true,
+      "bin": {
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+      },
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+      "optionalDependencies": {
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+        "@esbuild/darwin-x64": "0.19.2",
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+        "@esbuild/freebsd-x64": "0.19.2",
+        "@esbuild/linux-arm": "0.19.2",
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+        "@esbuild/linux-ia32": "0.19.2",
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+        "@esbuild/linux-x64": "0.19.2",
+        "@esbuild/netbsd-x64": "0.19.2",
+        "@esbuild/openbsd-x64": "0.19.2",
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+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.19.2.tgz",
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+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.19.2.tgz",
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+      "dev": true,
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+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.19.2.tgz",
+      "integrity": "sha512-mLfp0ziRPOLSTek0Gd9T5B8AtzKAkoZE70fneiiyPlSnUKKI4lp+mGEnQXcQEHLJAcIYDPSyBvsUbKUG2ri/XQ==",
+      "dev": true,
+      "optional": true
+    },
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+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.19.2.tgz",
+      "integrity": "sha512-hn28+JNDTxxCpnYjdDYVMNTR3SKavyLlCHHkufHV91fkewpIyQchS1d8wSbmXhs1fiYDpNww8KTFlJ1dHsxeSw==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/linux-mips64el": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.19.2.tgz",
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+      "dev": true,
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+    },
+    "@esbuild/linux-ppc64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.19.2.tgz",
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+      "dev": true,
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+    },
+    "@esbuild/linux-riscv64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.19.2.tgz",
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+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/linux-s390x": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.19.2.tgz",
+      "integrity": "sha512-U+RinR6aXXABFCcAY4gSlv4CL1oOVvSSCdseQmGO66H+XyuQGZIUdhG56SZaDJQcLmrSfRmx5XZOWyCJPRqS7g==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/linux-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.19.2.tgz",
+      "integrity": "sha512-oxzHTEv6VPm3XXNaHPyUTTte+3wGv7qVQtqaZCrgstI16gCuhNOtBXLEBkBREP57YTd68P0VgDgG73jSD8bwXQ==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/netbsd-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.19.2.tgz",
+      "integrity": "sha512-WNa5zZk1XpTTwMDompZmvQLHszDDDN7lYjEHCUmAGB83Bgs20EMs7ICD+oKeT6xt4phV4NDdSi/8OfjPbSbZfQ==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/openbsd-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.19.2.tgz",
+      "integrity": "sha512-S6kI1aT3S++Dedb7vxIuUOb3oAxqxk2Rh5rOXOTYnzN8JzW1VzBd+IqPiSpgitu45042SYD3HCoEyhLKQcDFDw==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/sunos-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.19.2.tgz",
+      "integrity": "sha512-VXSSMsmb+Z8LbsQGcBMiM+fYObDNRm8p7tkUDMPG/g4fhFX5DEFmjxIEa3N8Zr96SjsJ1woAhF0DUnS3MF3ARw==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/win32-arm64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.19.2.tgz",
+      "integrity": "sha512-5NayUlSAyb5PQYFAU9x3bHdsqB88RC3aM9lKDAz4X1mo/EchMIT1Q+pSeBXNgkfNmRecLXA0O8xP+x8V+g/LKg==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/win32-ia32": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.19.2.tgz",
+      "integrity": "sha512-47gL/ek1v36iN0wL9L4Q2MFdujR0poLZMJwhO2/N3gA89jgHp4MR8DKCmwYtGNksbfJb9JoTtbkoe6sDhg2QTA==",
+      "dev": true,
+      "optional": true
+    },
+    "@esbuild/win32-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.19.2.tgz",
+      "integrity": "sha512-tcuhV7ncXBqbt/Ybf0IyrMcwVOAPDckMK9rXNHtF17UTK18OKLpg08glminN06pt2WCoALhXdLfSPbVvK/6fxw==",
+      "dev": true,
+      "optional": true
+    },
     "@eslint-community/eslint-utils": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
@@ -2054,6 +2598,36 @@
       "dev": true,
       "optional": true
     },
+    "esbuild": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.19.2.tgz",
+      "integrity": "sha512-G6hPax8UbFakEj3hWO0Vs52LQ8k3lnBhxZWomUJDxfz3rZTLqF5k/FCzuNdLx2RbpBiQQF9H9onlDDH1lZsnjg==",
+      "dev": true,
+      "requires": {
+        "@esbuild/android-arm": "0.19.2",
+        "@esbuild/android-arm64": "0.19.2",
+        "@esbuild/android-x64": "0.19.2",
+        "@esbuild/darwin-arm64": "0.19.2",
+        "@esbuild/darwin-x64": "0.19.2",
+        "@esbuild/freebsd-arm64": "0.19.2",
+        "@esbuild/freebsd-x64": "0.19.2",
+        "@esbuild/linux-arm": "0.19.2",
+        "@esbuild/linux-arm64": "0.19.2",
+        "@esbuild/linux-ia32": "0.19.2",
+        "@esbuild/linux-loong64": "0.19.2",
+        "@esbuild/linux-mips64el": "0.19.2",
+        "@esbuild/linux-ppc64": "0.19.2",
+        "@esbuild/linux-riscv64": "0.19.2",
+        "@esbuild/linux-s390x": "0.19.2",
+        "@esbuild/linux-x64": "0.19.2",
+        "@esbuild/netbsd-x64": "0.19.2",
+        "@esbuild/openbsd-x64": "0.19.2",
+        "@esbuild/sunos-x64": "0.19.2",
+        "@esbuild/win32-arm64": "0.19.2",
+        "@esbuild/win32-ia32": "0.19.2",
+        "@esbuild/win32-x64": "0.19.2"
+      }
+    },
     "escape-string-regexp": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz",

package.json

@@ -1,6 +1,7 @@
 {
   "type": "module",
   "devDependencies": {
+    "esbuild": "^0.19.2",
     "eslint": "^8.49.0",
     "pdfjs-dist": "^3.10.111"
   }

process_static.js

@@ -0,0 +1,107 @@
+import esbuild from "esbuild";
+import { spawn } from "node:child_process";
+import fs from "node:fs/promises";
+import path from "node:path";
+
+/**
+ * @typedef ProcessOptions
+ * @property {string} rootDir
+ * @property {string[]} entryPoints
+ * @property {string} outDir
+ * @property {boolean} production
+ */
+
+async function processStatic() {
+    const rootDir = "viewer";
+    const outDir = "app/src/main/assets/viewer";
+    const outDirDebug = "app/src/debug/assets/viewer";
+
+    await commandLine(getCommand("node_modules/.bin/eslint"), ".");
+
+    await processScripts({
+        rootDir,
+        entryPoints: ["js/index.js", "js/worker.js"],
+        outDir,
+        production: true,
+    });
+    await processScripts({
+        rootDir,
+        entryPoints: ["js/index.js", "js/worker.js"],
+        outDir: outDirDebug,
+        production: false,
+    });
+    await processStyles({
+        rootDir,
+        entryPoints: ["main.css"],
+        outDir,
+        production: true,
+    });
+    await processHtml({
+        rootDir,
+        entryPoints: ["index.html"],
+        outDir,
+        production: true,
+    });
+}
+
+/**
+ * @param {string} command
+ * @param {string} winExt
+ * @returns {string}
+ */
+function getCommand(command, winExt = "cmd") {
+    return path.resolve(globalThis.process.platform === "win32" ? `${command}.${winExt}` : command);
+}
+
+/**
+ * @param {string} command
+ * @param  {...string} args
+ * @returns {Promise<void>}
+ */
+function commandLine(command, ...args) {
+    return new Promise((resolve, reject) => {
+        const subprocess = spawn(command, args, { shell: false, stdio: "inherit" });
+        subprocess.on("close", (code) => code === 0 ? resolve() : reject());
+    });
+}
+
+/**
+ * @param {ProcessOptions} options
+ */
+async function processScripts(options) {
+    const entryPoints = options.entryPoints.map((filepath) => path.join(options.rootDir, filepath));
+    await esbuild.build({
+        entryPoints,
+        bundle: true,
+        format: "esm",
+        platform: "browser",
+        target: "es2022",
+        outdir: path.join(options.outDir, "js"),
+        minify: options.production,
+        sourcemap: options.production ? false : "inline",
+    });
+}
+
+/**
+ * @param {ProcessOptions} options
+ */
+async function processStyles(options) {
+    const entryPoints = options.entryPoints.map((filepath) => path.join(options.rootDir, filepath));
+    await esbuild.build({
+        entryPoints,
+        bundle: true,
+        outdir: options.outDir,
+        minify: options.production,
+    });
+}
+
+/**
+ * @param {ProcessOptions} options
+ */
+async function processHtml(options) {
+    for (const entryPoint of options.entryPoints) {
+        await fs.copyFile(path.join(options.rootDir, entryPoint), path.join(options.outDir, entryPoint));
+    }
+}
+
+await processStatic();

viewer/index.html

@@ -3,14 +3,13 @@
     <head>
         <meta name="viewport" content="width=device-width, user-scalable=no" />
         <title>PDF</title>
-        <link rel="stylesheet" href="viewer.css" />
+        <link rel="stylesheet" href="/viewer/main.css">
-        <script src="pdf.js"></script>
+        <script type="module" src="/viewer/js/index.js"></script>
     </head>
     <body>
         <div id="container">
             <canvas id="content"></canvas>
             <div id="text" class="textLayer"></div>
         </div>
-        <script src="viewer.js"></script>
     </body>
 </html>

viewer/js/index.js

@@ -1,6 +1,11 @@
-"use strict";
+import {
+    GlobalWorkerOptions,
+    PasswordResponses,
+    getDocument,
+    renderTextLayer,
+} from "pdfjs-dist";
 
-pdfjsLib.GlobalWorkerOptions.workerSrc = "/pdf.worker.js";
+GlobalWorkerOptions.workerSrc = "/viewer/js/worker.js";
 
 let pdfDoc = null;
 let pageRendering = false;
@@ -166,7 +171,7 @@ function renderPage(pageNumber, zoom, prerender, prerenderTrigger=0) {
             render();
 
             const newTextLayerDiv = textLayerDiv.cloneNode();
-            task = pdfjsLib.renderTextLayer({
+            task = renderTextLayer({
                 textContentSource: page.streamTextContent(),
                 container: newTextLayerDiv,
                 viewport: viewport
@@ -215,7 +220,7 @@ function renderPage(pageNumber, zoom, prerender, prerenderTrigger=0) {
     });
 }
 
-function onRenderPage(zoom) {
+globalThis.onRenderPage = function (zoom) {
     if (pageRendering) {
         if (newPageNumber === channel.getPage() && newZoomRatio === channel.getZoomRatio() &&
                 orientationDegrees === channel.getDocumentOrientationDegrees()) {
@@ -232,13 +237,13 @@ function onRenderPage(zoom) {
     } else {
         renderPage(channel.getPage(), zoom, false);
     }
-}
+};
 
-function isTextSelected() {
+globalThis.isTextSelected = function () {
     return window.getSelection().toString() !== "";
-}
+};
 
-function toggleTextLayerVisibility() {
+globalThis.toggleTextLayerVisibility = function () {
     let textLayerForeground = "red";
     let textLayerOpacity = 1;
     if (isTextLayerVisible) {
@@ -248,15 +253,15 @@ function toggleTextLayerVisibility() {
     document.documentElement.style.setProperty("--text-layer-foreground", textLayerForeground);
     document.documentElement.style.setProperty("--text-layer-opacity", textLayerOpacity.toString());
     isTextLayerVisible = !isTextLayerVisible;
-}
+};
 
-function loadDocument() {
+globalThis.loadDocument = function () {
     const pdfPassword = channel.getPassword();
-    const loadingTask = pdfjsLib.getDocument({ url: "https://localhost/placeholder.pdf", password: pdfPassword });
+    const loadingTask = getDocument({ url: "https://localhost/placeholder.pdf", password: pdfPassword });
     loadingTask.onPassword = (_, error) => {
-        if (error === pdfjsLib.PasswordResponses.NEED_PASSWORD) {
+        if (error === PasswordResponses.NEED_PASSWORD) {
             channel.showPasswordPrompt();
-        } else if (error === pdfjsLib.PasswordResponses.INCORRECT_PASSWORD) {
+        } else if (error === PasswordResponses.INCORRECT_PASSWORD) {
             channel.invalidPassword();
         }
     };
@@ -274,7 +279,7 @@ function loadDocument() {
     }, function (reason) {
         console.error(reason.name + ": " + reason.message);
     });
-}
+};
 
 window.onresize = () => {
     setLayerTransform(canvas.clientWidth, canvas.clientHeight, textLayerDiv);

viewer/js/worker.js

@@ -0,0 +1 @@
+import "pdfjs-dist/build/pdf.worker.js";