(core) Relocate export urls to /download/

Summary:
Moves CSV and XLSX export urls under /download/, and
removes the document title query parameter which is now
retrieved from the backend.

Test Plan: No new tests. Existing tests that verify endpoints still function.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3010

app/client/components/GristDoc.ts

@@ -46,7 +46,7 @@ import {isSchemaAction} from 'app/common/DocActions';
 import {OpenLocalDocResult} from 'app/common/DocListAPI';
 import {HashLink, IDocPage} from 'app/common/gristUrls';
 import {RecalcWhen} from 'app/common/gristTypes';
-import {encodeQueryParams, undef, waitObs} from 'app/common/gutil';
+import {undef, waitObs} from 'app/common/gutil';
 import {LocalPlugin} from "app/common/plugin";
 import {StringUnion} from 'app/common/StringUnion';
 import {TableData} from 'app/common/TableData';
@@ -625,29 +625,20 @@ export class GristDoc extends DisposableWithEvents {
     );
   }
 
-  public getXlsxLink() {
-    const baseUrl = this.docPageModel.appModel.api.getDocAPI(this.docId()).getGenerateXlsxUrl();
-    const params = {
-      title: this.docPageModel.currentDocTitle.get(),
-    };
-    return baseUrl + '?' + encodeQueryParams(params);
-  }
-
   public getCsvLink() {
     const filters = this.viewModel.activeSection.peek().filteredFields.get().map(field=> ({
       colRef : field.colRef.peek(),
       filter : field.activeFilter.peek()
     }));
 
-    const baseUrl = this.docPageModel.appModel.api.getDocAPI(this.docId()).getGenerateCsvUrl();
     const params = {
-      title: this.docPageModel.currentDocTitle.get(),
       viewSection: this.viewModel.activeSectionId(),
       tableId: this.viewModel.activeSection().table().tableId(),
       activeSortSpec: JSON.stringify(this.viewModel.activeSection().activeSortSpec()),
       filters : JSON.stringify(filters),
     };
-    return baseUrl + '?' + encodeQueryParams(params);
+
+    return this.docPageModel.appModel.api.getDocAPI(this.docId()).getDownloadCsvUrl(params);
   }
 
   public hasGranularAccessRules(): boolean {

app/client/ui/ShareMenu.ts

@@ -223,8 +223,10 @@ function menuExports(doc: Document, pageModel: DocPageModel) {
     ),
     menuItemLink({ href: gristDoc.getCsvLink(), target: '_blank', download: ''},
       menuIcon('Download'), 'Export CSV', testId('tb-share-option')),
-    menuItemLink({ href: gristDoc.getXlsxLink(), target: '_blank', download: ''},
-      menuIcon('Download'), 'Export XLSX', testId('tb-share-option')),
+    menuItemLink({
+      href: pageModel.appModel.api.getDocAPI(doc.id).getDownloadXlsxUrl(),
+      target: '_blank', download: ''
+    }, menuIcon('Download'), 'Export XLSX', testId('tb-share-option')),
     menuItem(() => sendToDrive(doc, pageModel),
       menuIcon('Download'), 'Send to Google Drive', testId('tb-share-option')),
   ];