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web/genericcom.js

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+/* Copyright 2017 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { AppOptions } from "./app_options.js";
+import { BaseExternalServices } from "./external_services.js";
+import { BasePreferences } from "./preferences.js";
+import { GenericL10n } from "./genericl10n.js";
+import { GenericScripting } from "./generic_scripting.js";
+import { SignatureStorage } from "./generic_signature_storage.js";
+
+if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("GENERIC")) {
+  throw new Error(
+    'Module "pdfjs-web/genericcom" shall not be used outside GENERIC build.'
+  );
+}
+
+function initCom(app) {}
+
+class Preferences extends BasePreferences {
+  async _writeToStorage(prefObj) {
+    localStorage.setItem("pdfjs.preferences", JSON.stringify(prefObj));
+  }
+
+  async _readFromStorage(prefObj) {
+    return { prefs: JSON.parse(localStorage.getItem("pdfjs.preferences")) };
+  }
+}
+
+class ExternalServices extends BaseExternalServices {
+  async createL10n() {
+    return new GenericL10n(AppOptions.get("localeProperties")?.lang);
+  }
+
+  createScripting() {
+    return new GenericScripting(AppOptions.get("sandboxBundleSrc"));
+  }
+
+  createSignatureStorage(eventBus, signal) {
+    return new SignatureStorage(eventBus, signal);
+  }
+}
+
+class MLManager {
+  static {
+    if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
+      this.getFakeMLManager = options => new FakeMLManager(options);
+    }
+  }
+
+  async isEnabledFor(_name) {
+    return false;
+  }
+
+  async deleteModel(_service) {
+    return null;
+  }
+
+  isReady(_name) {
+    return false;
+  }
+
+  guess(_data) {}
+
+  toggleService(_name, _enabled) {}
+}
+
+if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
+  // eslint-disable-next-line no-var
+  var FakeMLManager = class {
+    eventBus = null;
+
+    hasProgress = false;
+
+    constructor({ enableGuessAltText, enableAltTextModelDownload }) {
+      this.enableGuessAltText = enableGuessAltText;
+      this.enableAltTextModelDownload = enableAltTextModelDownload;
+    }
+
+    setEventBus(eventBus, abortSignal) {
+      this.eventBus = eventBus;
+    }
+
+    async isEnabledFor(_name) {
+      return this.enableGuessAltText;
+    }
+
+    async deleteModel(_name) {
+      this.enableAltTextModelDownload = false;
+      return null;
+    }
+
+    async loadModel(_name) {}
+
+    async downloadModel(_name) {
+      // Simulate downloading the model but with progress.
+      // The progress can be seen in the new alt-text dialog.
+      this.hasProgress = true;
+
+      const { promise, resolve } = Promise.withResolvers();
+      const total = 1e8;
+      const end = 1.5 * total;
+      const increment = 5e6;
+      let loaded = 0;
+      const id = setInterval(() => {
+        loaded += increment;
+        if (loaded <= end) {
+          this.eventBus.dispatch("loadaiengineprogress", {
+            source: this,
+            detail: {
+              total,
+              totalLoaded: loaded,
+              finished: loaded + increment >= end,
+            },
+          });
+          return;
+        }
+        clearInterval(id);
+        this.hasProgress = false;
+        this.enableAltTextModelDownload = true;
+        resolve(true);
+      }, 900);
+      return promise;
+    }
+
+    isReady(_name) {
+      return this.enableAltTextModelDownload;
+    }
+
+    guess({ request: { data } }) {
+      return new Promise(resolve => {
+        setTimeout(() => {
+          resolve(data ? { output: "Fake alt text." } : { error: true });
+        }, 3000);
+      });
+    }
+
+    toggleService(_name, enabled) {
+      this.enableGuessAltText = enabled;
+    }
+  };
+}
+
+export { ExternalServices, initCom, MLManager, Preferences };