Add ability to retrieve specific page versions and nodes with ?version=XX param

app/controllers/api/v1/Page.controller.js

@@ -12,13 +12,24 @@ class Page extends Controller {
         const PageId = req.params.PageId
         const user = req.user
 
-        const page = await PageModel.findOne({UUID: PageId})
+        let page = await PageModel.findOne({UUID: PageId})
         if ( !page ) return res.status(404).message('Page not found with that ID.').api({})
 
         if ( !(await page.is_accessible_by(user)) ) return req.security.deny()
-        page.level = await page.access_level_for(req.user)
+        const level = await page.access_level_for(req.user)
 
-        return res.api(page)
+        const version_num = req.body.version || req.query.version
+        if ( version_num ) {
+            if ( page.has_version(version_num) ) {
+                page = await page.as_version(version_num)
+            }
+        }
+
+        const data = page.toJSON()
+        delete data.version_archive
+        data.level = level
+        data._id = page.id
+        return res.api(data)
     }
 
     async save_page(req, res) {
@@ -35,7 +46,7 @@ class Page extends Controller {
             page.OrgUserId = req.user._id
         }
 
-        let save_message = 'Updated page metadata'
+        let save_message = 'Page contents saved'
 
         if ( !req.body.Name ) return res.status(400).message('Missing required: Name').api({})
 
@@ -84,17 +95,24 @@ class Page extends Controller {
             if ( !(await page.is_accessible_by(req.user)) ) return req.security.deny()
         }
 
-        const nodes = await Node.find({PageId: page.UUID});
+        const version_num = req.body.version || req.query.version
+        if ( version_num ) {
+            if ( page.has_version(version_num) ) {
+                page = await page.as_version(version_num)
+            }
+        }
+
+        const nodes = await page.nodes
         const assoc_nodes = {}
         nodes.forEach(node => {
             assoc_nodes[node.UUID] = node
         })
 
-        const return_nodes = [];
+        const return_nodes = []
         for ( const uuid of page.NodeIds ) {
             return_nodes.push(assoc_nodes[uuid])
         }
-        return res.api(return_nodes);
+        return res.api(return_nodes)
     }
 
     async save_node_to_page(req, res) {