fork from https://github.com/mozilla/pdf.js.git

web/download_manager.js

@@ -0,0 +1,64 @@
+/* Copyright 2013 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 { BaseDownloadManager } from "./base_download_manager.js";
+import { createValidAbsoluteUrl } from "pdfjs-lib";
+
+if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("CHROME || GENERIC")) {
+  throw new Error(
+    'Module "pdfjs-web/download_manager" shall not be used ' +
+      "outside CHROME and GENERIC builds."
+  );
+}
+
+class DownloadManager extends BaseDownloadManager {
+  _triggerDownload(blobUrl, originalUrl, filename, isAttachment = false) {
+    if (!blobUrl && !isAttachment) {
+      // Fallback to downloading non-attachments by their URL.
+      if (!createValidAbsoluteUrl(originalUrl, "http://example.com")) {
+        throw new Error(`_triggerDownload - not a valid URL: ${originalUrl}`);
+      }
+      blobUrl = originalUrl + "#pdfjs.action=download";
+    }
+
+    const a = document.createElement("a");
+    a.href = blobUrl;
+    a.target = "_parent";
+    // Use a.download if available. This increases the likelihood that
+    // the file is downloaded instead of opened by another PDF plugin.
+    if ("download" in a) {
+      a.download = filename;
+    }
+    // <a> must be in the document for recent Firefox versions,
+    // otherwise .click() is ignored.
+    (document.body || document.documentElement).append(a);
+    a.click();
+    a.remove();
+  }
+
+  _getOpenDataUrl(blobUrl, filename, dest = null) {
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("COMPONENTS")) {
+      throw new Error("Opening data is not supported in `COMPONENTS` builds.");
+    }
+    // The current URL is the viewer, let's use it and append the file.
+    let url = "?file=" + encodeURIComponent(blobUrl + "#" + filename);
+    if (dest) {
+      url += `#${escape(dest)}`;
+    }
+    return url;
+  }
+}
+
+export { DownloadManager };