feat: Nested document sharing (#2075)

* migration

* frontend routing, api permissioning

* feat: apiVersion=2

* feat: re-writing document links to point to share

* poc nested documents on share links

* fix: nested shareId permissions

* ui and language tweaks, comments

* breadcrumbs

* Add icons to reference list items

* refactor: Breadcrumb component

* tweaks

* Add shared parent note

server/models/Collection.js

@@ -375,6 +375,77 @@ Collection.prototype.deleteDocument = async function (document) {
   await document.deleteWithChildren();
 };
 
+Collection.prototype.isChildDocument = function (
+  parentDocumentId,
+  documentId
+): boolean {
+  let result = false;
+
+  const loopChildren = (documents, input) => {
+    return documents.map((document) => {
+      let parents = [...input];
+      if (document.id === documentId) {
+        result = parents.includes(parentDocumentId);
+      } else {
+        parents.push(document.id);
+        loopChildren(document.children, parents);
+      }
+      return document;
+    });
+  };
+
+  loopChildren(this.documentStructure, []);
+
+  return result;
+};
+
+Collection.prototype.getDocumentTree = function (documentId: string) {
+  let result;
+
+  const loopChildren = (documents) => {
+    if (result) {
+      return;
+    }
+
+    documents.forEach((document) => {
+      if (result) {
+        return;
+      }
+      if (document.id === documentId) {
+        result = document;
+      } else {
+        loopChildren(document.children);
+      }
+    });
+  };
+
+  loopChildren(this.documentStructure);
+  return result;
+};
+
+Collection.prototype.getDocumentParents = function (
+  documentId: string
+): string[] | void {
+  let result;
+
+  const loopChildren = (documents, path = []) => {
+    if (result) {
+      return;
+    }
+
+    documents.forEach((document) => {
+      if (document.id === documentId) {
+        result = path;
+      } else {
+        loopChildren(document.children, [...path, document.id]);
+      }
+    });
+  };
+
+  loopChildren(this.documentStructure);
+  return result;
+};
+
 Collection.prototype.removeDocumentInStructure = async function (
   document,
   options