Remove PDFWorkerUtil and move its contents into PDFWorker instead

src/display/api.js

@@ -1998,47 +1998,6 @@ class LoopbackPort {
  *   the constants from {@link VerbosityLevel} should be used.
  */
 
-const PDFWorkerUtil = {
-  isWorkerDisabled: false,
-  fakeWorkerId: 0,
-};
-if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
-  if (isNodeJS) {
-    // Workers aren't supported in Node.js, force-disabling them there.
-    PDFWorkerUtil.isWorkerDisabled = true;
-
-    GlobalWorkerOptions.workerSrc ||= PDFJSDev.test("LIB")
-      ? "../pdf.worker.js"
-      : "./pdf.worker.mjs";
-  }
-
-  // Check if URLs have the same origin. For non-HTTP based URLs, returns false.
-  PDFWorkerUtil.isSameOrigin = function (baseUrl, otherUrl) {
-    let base;
-    try {
-      base = new URL(baseUrl);
-      if (!base.origin || base.origin === "null") {
-        return false; // non-HTTP url
-      }
-    } catch {
-      return false;
-    }
-
-    const other = new URL(otherUrl, base);
-    return base.origin === other.origin;
-  };
-
-  PDFWorkerUtil.createCDNWrapper = function (url) {
-    // We will rely on blob URL's property to specify origin.
-    // We want this function to fail in case if createObjectURL or Blob do not
-    // exist or fail for some reason -- our Worker creation will fail anyway.
-    const wrapper = `await import("${url}");`;
-    return URL.createObjectURL(
-      new Blob([wrapper], { type: "text/javascript" })
-    );
-  };
-}
-
 /**
  * PDF.js web worker abstraction that controls the instantiation of PDF
  * documents. Message handlers are used to pass information from the main
@@ -2048,8 +2007,52 @@ if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
  * @param {PDFWorkerParameters} params - The worker initialization parameters.
  */
 class PDFWorker {
+  static #fakeWorkerId = 0;
+
+  static #isWorkerDisabled = false;
+
   static #workerPorts;
 
+  static {
+    if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
+      if (isNodeJS) {
+        // Workers aren't supported in Node.js, force-disabling them there.
+        this.#isWorkerDisabled = true;
+
+        GlobalWorkerOptions.workerSrc ||= PDFJSDev.test("LIB")
+          ? "../pdf.worker.js"
+          : "./pdf.worker.mjs";
+      }
+
+      // Check if URLs have the same origin. For non-HTTP based URLs, returns
+      // false.
+      this._isSameOrigin = (baseUrl, otherUrl) => {
+        let base;
+        try {
+          base = new URL(baseUrl);
+          if (!base.origin || base.origin === "null") {
+            return false; // non-HTTP url
+          }
+        } catch {
+          return false;
+        }
+        const other = new URL(otherUrl, base);
+        return base.origin === other.origin;
+      };
+
+      this._createCDNWrapper = url => {
+        // We will rely on blob URL's property to specify origin.
+        // We want this function to fail in case if createObjectURL or Blob do
+        // not exist or fail for some reason -- our Worker creation will fail
+        // anyway.
+        const wrapper = `await import("${url}");`;
+        return URL.createObjectURL(
+          new Blob([wrapper], { type: "text/javascript" })
+        );
+      };
+    }
+  }
+
   constructor({
     name = null,
     port = null,
@@ -2138,7 +2141,7 @@ class PDFWorker {
     // Right now, the requirement is, that an Uint8Array is still an
     // Uint8Array as it arrives on the worker.
     if (
-      PDFWorkerUtil.isWorkerDisabled ||
+      PDFWorker.#isWorkerDisabled ||
       PDFWorker.#mainThreadWorkerMessageHandler
     ) {
       this._setupFakeWorker();
@@ -2152,9 +2155,9 @@ class PDFWorker {
       if (
         typeof PDFJSDev !== "undefined" &&
         PDFJSDev.test("GENERIC") &&
-        !PDFWorkerUtil.isSameOrigin(window.location.href, workerSrc)
+        !PDFWorker._isSameOrigin(window.location.href, workerSrc)
       ) {
-        workerSrc = PDFWorkerUtil.createCDNWrapper(
+        workerSrc = PDFWorker._createCDNWrapper(
           new URL(workerSrc, window.location).href
         );
       }
@@ -2234,9 +2237,9 @@ class PDFWorker {
   }
 
   _setupFakeWorker() {
-    if (!PDFWorkerUtil.isWorkerDisabled) {
+    if (!PDFWorker.#isWorkerDisabled) {
       warn("Setting up fake worker.");
-      PDFWorkerUtil.isWorkerDisabled = true;
+      PDFWorker.#isWorkerDisabled = true;
     }
 
     PDFWorker._setupFakeWorkerGlobal
@@ -2249,7 +2252,7 @@ class PDFWorker {
         this._port = port;
 
         // All fake workers use the same port, making id unique.
-        const id = `fake${PDFWorkerUtil.fakeWorkerId++}`;
+        const id = `fake${PDFWorker.#fakeWorkerId++}`;
 
         // If the main thread is our worker, setup the handling for the
         // messages -- the main thread sends to it self.
@@ -3470,7 +3473,6 @@ export {
   PDFDocumentProxy,
   PDFPageProxy,
   PDFWorker,
-  PDFWorkerUtil,
   RenderTask,
   version,
 };

test/unit/api_spec.js

@@ -43,7 +43,6 @@ import {
   PDFDocumentProxy,
   PDFPageProxy,
   PDFWorker,
-  PDFWorkerUtil,
   RenderTask,
 } from "../../src/display/api.js";
 import {
@@ -929,6 +928,31 @@ describe("api", function () {
       expect(typeof workerSrc).toEqual("string");
       expect(workerSrc).toEqual(GlobalWorkerOptions.workerSrc);
     });
+
+    describe("isSameOrigin", function () {
+      it("handles invalid base URLs", function () {
+        // The base URL is not valid.
+        expect(PDFWorker._isSameOrigin("/foo", "/bar")).toEqual(false);
+
+        // The base URL has no origin.
+        expect(PDFWorker._isSameOrigin("blob:foo", "/bar")).toEqual(false);
+      });
+
+      it("correctly checks if the origin of both URLs matches", function () {
+        expect(
+          PDFWorker._isSameOrigin(
+            "https://www.mozilla.org/foo",
+            "https://www.mozilla.org/bar"
+          )
+        ).toEqual(true);
+        expect(
+          PDFWorker._isSameOrigin(
+            "https://www.mozilla.org/foo",
+            "https://www.example.com/bar"
+          )
+        ).toEqual(false);
+      });
+    });
   });
 
   describe("GlobalWorkerOptions", function () {
@@ -4885,33 +4909,4 @@ Caron Broadcasting, Inc., an Ohio corporation (“Lessee”).`)
       }
     );
   });
-
-  describe("PDFWorkerUtil", function () {
-    describe("isSameOrigin", function () {
-      const { isSameOrigin } = PDFWorkerUtil;
-
-      it("handles invalid base URLs", function () {
-        // The base URL is not valid.
-        expect(isSameOrigin("/foo", "/bar")).toEqual(false);
-
-        // The base URL has no origin.
-        expect(isSameOrigin("blob:foo", "/bar")).toEqual(false);
-      });
-
-      it("correctly checks if the origin of both URLs matches", function () {
-        expect(
-          isSameOrigin(
-            "https://www.mozilla.org/foo",
-            "https://www.mozilla.org/bar"
-          )
-        ).toEqual(true);
-        expect(
-          isSameOrigin(
-            "https://www.mozilla.org/foo",
-            "https://www.example.com/bar"
-          )
-        ).toEqual(false);
-      });
-    });
-  });
 });