[api-minor] Move addLinkAttributes and LinkTarget into the viewer

As part of the changes/improvement in PR 14092, we're no longer using the `addLinkAttributes` directly in e.g. the AnnotationLayer-code.
Given that the helper function is now *only* used in the viewer, hence it no longer seems necessary to expose it through the official API.

*Please note:* It seems somewhat unlikely that third-party users were relying *directly* on the helper function, which is why it's not being exported as part of the viewer components. (If necessary, we can always change this later on.)

src/display/display_utils.js

@@ -13,24 +13,21 @@
  * limitations under the License.
  */
 
-import {
-  assert,
-  BaseException,
-  isString,
-  removeNullCharacters,
-  shadow,
-  stringToBytes,
-  Util,
-  warn,
-} from "../shared/util.js";
 import {
   BaseCanvasFactory,
   BaseCMapReaderFactory,
   BaseStandardFontDataFactory,
   BaseSVGFactory,
 } from "./base_factory.js";
+import {
+  BaseException,
+  isString,
+  shadow,
+  stringToBytes,
+  Util,
+  warn,
+} from "../shared/util.js";
 
-const DEFAULT_LINK_REL = "noopener noreferrer nofollow";
 const SVG_NS = "http://www.w3.org/2000/svg";
 
 const PixelsPerInch = {
@@ -316,70 +313,6 @@ class RenderingCancelledException extends BaseException {
   }
 }
 
-const LinkTarget = {
-  NONE: 0, // Default value.
-  SELF: 1,
-  BLANK: 2,
-  PARENT: 3,
-  TOP: 4,
-};
-
-/**
- * @typedef ExternalLinkParameters
- * @typedef {Object} ExternalLinkParameters
- * @property {string} url - An absolute URL.
- * @property {LinkTarget} [target] - The link target. The default value is
- *   `LinkTarget.NONE`.
- * @property {string} [rel] - The link relationship. The default value is
- *   `DEFAULT_LINK_REL`.
- * @property {boolean} [enabled] - Whether the link should be enabled. The
- *   default value is true.
- */
-
-/**
- * Adds various attributes (href, title, target, rel) to hyperlinks.
- * @param {HTMLAnchorElement} link - The link element.
- * @param {ExternalLinkParameters} params
- */
-function addLinkAttributes(link, { url, target, rel, enabled = true } = {}) {
-  assert(
-    url && typeof url === "string",
-    'addLinkAttributes: A valid "url" parameter must provided.'
-  );
-
-  const urlNullRemoved = removeNullCharacters(url);
-  if (enabled) {
-    link.href = link.title = urlNullRemoved;
-  } else {
-    link.href = "";
-    link.title = `Disabled: ${urlNullRemoved}`;
-    link.onclick = () => {
-      return false;
-    };
-  }
-
-  let targetStr = ""; // LinkTarget.NONE
-  switch (target) {
-    case LinkTarget.NONE:
-      break;
-    case LinkTarget.SELF:
-      targetStr = "_self";
-      break;
-    case LinkTarget.BLANK:
-      targetStr = "_blank";
-      break;
-    case LinkTarget.PARENT:
-      targetStr = "_parent";
-      break;
-    case LinkTarget.TOP:
-      targetStr = "_top";
-      break;
-  }
-  link.target = targetStr;
-
-  link.rel = typeof rel === "string" ? rel : DEFAULT_LINK_REL;
-}
-
 function isDataScheme(url) {
   const ii = url.length;
   let i = 0;
@@ -632,7 +565,6 @@ function getXfaPageViewport(xfaPage, { scale = 1, rotation = 0 }) {
 }
 
 export {
-  addLinkAttributes,
   deprecated,
   DOMCanvasFactory,
   DOMCMapReaderFactory,
@@ -644,7 +576,6 @@ export {
   isDataScheme,
   isPdfFile,
   isValidFetchUrl,
-  LinkTarget,
   loadScript,
   PageViewport,
   PDFDateString,

src/pdf.js

@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* eslint-disable sort-exports/sort-exports */
 
 // eslint-disable-next-line max-len
 /** @typedef {import("./display/api").PDFDocumentLoadingTask} PDFDocumentLoadingTask */
@@ -20,19 +19,6 @@
 /** @typedef {import("./display/api").PDFPageProxy} PDFPageProxy */
 /** @typedef {import("./display/api").RenderTask} RenderTask */
 
-import {
-  addLinkAttributes,
-  getFilenameFromUrl,
-  getPdfFilenameFromUrl,
-  getXfaPageViewport,
-  isPdfFile,
-  isValidFetchUrl,
-  LinkTarget,
-  loadScript,
-  PDFDateString,
-  PixelsPerInch,
-  RenderingCancelledException,
-} from "./display/display_utils.js";
 import {
   AnnotationMode,
   CMapCompressionType,
@@ -60,6 +46,17 @@ import {
   setPDFNetworkStreamFactory,
   version,
 } from "./display/api.js";
+import {
+  getFilenameFromUrl,
+  getPdfFilenameFromUrl,
+  getXfaPageViewport,
+  isPdfFile,
+  isValidFetchUrl,
+  loadScript,
+  PDFDateString,
+  PixelsPerInch,
+  RenderingCancelledException,
+} from "./display/display_utils.js";
 import { AnnotationLayer } from "./display/annotation_layer.js";
 import { GlobalWorkerOptions } from "./display/worker_options.js";
 import { isNodeJS } from "./shared/is_node.js";
@@ -108,49 +105,39 @@ if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("PRODUCTION")) {
 }
 
 export {
-  // From "./display/display_utils.js":
-  addLinkAttributes,
-  getFilenameFromUrl,
-  getPdfFilenameFromUrl,
-  isPdfFile,
-  LinkTarget,
-  loadScript,
-  PDFDateString,
-  PixelsPerInch,
-  RenderingCancelledException,
-  getXfaPageViewport,
-  // From "./shared/util.js":
+  AnnotationLayer,
   AnnotationMode,
+  build,
   CMapCompressionType,
   createObjectURL,
   createPromiseCapability,
   createValidAbsoluteUrl,
+  getDocument,
+  getFilenameFromUrl,
+  getPdfFilenameFromUrl,
+  getXfaPageViewport,
+  GlobalWorkerOptions,
   InvalidPDFException,
+  isPdfFile,
+  loadScript,
+  LoopbackPort,
   MissingPDFException,
   OPS,
   PasswordResponses,
+  PDFDataRangeTransport,
+  PDFDateString,
+  PDFWorker,
   PermissionFlag,
+  PixelsPerInch,
   removeNullCharacters,
+  RenderingCancelledException,
+  renderTextLayer,
   shadow,
+  SVGGraphics,
   UnexpectedResponseException,
   UNSUPPORTED_FEATURES,
   Util,
   VerbosityLevel,
-  // From "./display/api.js":
-  build,
-  getDocument,
-  LoopbackPort,
-  PDFDataRangeTransport,
-  PDFWorker,
   version,
-  // From "./display/annotation_layer.js":
-  AnnotationLayer,
-  // From "./display/worker_options.js":
-  GlobalWorkerOptions,
-  // From "./display/text_layer.js":
-  renderTextLayer,
-  // From "./display/svg.js":
-  SVGGraphics,
-  // From "./display/xfa_layer.js":
   XfaLayer,
 };