Add support for 3D/CAD file formats preview (#34794)

Fix #34775 

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/render/pdf.ts

@@ -1,17 +0,0 @@
-import {htmlEscape} from 'escape-goat';
-import {registerGlobalInitFunc} from '../modules/observer.ts';
-
-export async function initPdfViewer() {
-  registerGlobalInitFunc('initPdfViewer', async (el: HTMLInputElement) => {
-    const pdfobject = await import(/* webpackChunkName: "pdfobject" */'pdfobject');
-
-    const src = el.getAttribute('data-src');
-    const fallbackText = el.getAttribute('data-fallback-button-text');
-    pdfobject.embed(src, el, {
-      fallbackLink: htmlEscape`
-        <a role="button" class="ui basic button pdf-fallback-button" href="[url]">${fallbackText}</a>
-      `,
-    });
-    el.classList.remove('is-loading');
-  });
-}

web_src/js/render/plugin.ts

@@ -0,0 +1,10 @@
+export type FileRenderPlugin = {
+  // unique plugin name
+  name: string;
+
+  // test if plugin can handle a specified file
+  canHandle: (filename: string, mimeType: string) => boolean;
+
+  // render file content
+  render: (container: HTMLElement, fileUrl: string, options?: any) => Promise<void>;
+}

web_src/js/render/plugins/3d-viewer.ts

@@ -0,0 +1,60 @@
+import type {FileRenderPlugin} from '../plugin.ts';
+import {extname} from '../../utils.ts';
+
+// support common 3D model file formats, use online-3d-viewer library for rendering
+
+// eslint-disable-next-line multiline-comment-style
+/* a simple text STL file example:
+solid SimpleTriangle
+  facet normal 0 0 1
+    outer loop
+      vertex 0 0 0
+      vertex 1 0 0
+      vertex 0 1 0
+    endloop
+  endfacet
+endsolid SimpleTriangle
+*/
+
+export function newRenderPlugin3DViewer(): FileRenderPlugin {
+  // Some extensions are text-based formats:
+  // .3mf .amf .brep: XML
+  // .fbx: XML or BINARY
+  // .dae .gltf: JSON
+  // .ifc, .igs, .iges, .stp, .step are: TEXT
+  // .stl .ply: TEXT or BINARY
+  // .obj .off .wrl: TEXT
+  // So we need to be able to render when the file is recognized as plaintext file by backend.
+  //
+  // It needs more logic to make it overall right (render a text 3D model automatically):
+  // we need to distinguish the ambiguous filename extensions.
+  // For example: "*.obj, *.off, *.step" might be or not be a 3D model file.
+  // So when it is a text file, we can't assume that "we only render it by 3D plugin",
+  // otherwise the end users would be impossible to view its real content when the file is not a 3D model.
+  const SUPPORTED_EXTENSIONS = [
+    '.3dm', '.3ds', '.3mf', '.amf', '.bim', '.brep',
+    '.dae', '.fbx', '.fcstd', '.glb', '.gltf',
+    '.ifc', '.igs', '.iges', '.stp', '.step',
+    '.stl', '.obj', '.off', '.ply', '.wrl',
+  ];
+
+  return {
+    name: '3d-model-viewer',
+
+    canHandle(filename: string, _mimeType: string): boolean {
+      const ext = extname(filename).toLowerCase();
+      return SUPPORTED_EXTENSIONS.includes(ext);
+    },
+
+    async render(container: HTMLElement, fileUrl: string): Promise<void> {
+      // TODO: height and/or max-height?
+      const OV = await import(/* webpackChunkName: "online-3d-viewer" */'online-3d-viewer');
+      const viewer = new OV.EmbeddedViewer(container, {
+        backgroundColor: new OV.RGBAColor(59, 68, 76, 0),
+        defaultColor: new OV.RGBColor(65, 131, 196),
+        edgeSettings: new OV.EdgeSettings(false, new OV.RGBColor(0, 0, 0), 1),
+      });
+      viewer.LoadModelFromUrlList([fileUrl]);
+    },
+  };
+}

web_src/js/render/plugins/pdf-viewer.ts

@@ -0,0 +1,20 @@
+import type {FileRenderPlugin} from '../plugin.ts';
+
+export function newRenderPluginPdfViewer(): FileRenderPlugin {
+  return {
+    name: 'pdf-viewer',
+
+    canHandle(filename: string, _mimeType: string): boolean {
+      return filename.toLowerCase().endsWith('.pdf');
+    },
+
+    async render(container: HTMLElement, fileUrl: string): Promise<void> {
+      const PDFObject = await import(/* webpackChunkName: "pdfobject" */'pdfobject');
+      // TODO: the PDFObject library does not support dynamic height adjustment,
+      container.style.height = `${window.innerHeight - 100}px`;
+      if (!PDFObject.default.embed(fileUrl, container)) {
+        throw new Error('Unable to render the PDF file');
+      }
+    },
+  };
+}