feat(admin): export tool for full migration / backup (#5294)

* feat: export content utility (wip)

* feat: export navigation + groups + users

* feat: export comments + navigation + pages + pages history + settings

* feat: export assets

server/graph/resolvers/system.js

@@ -41,6 +41,14 @@ module.exports = {
         ext.isCompatible = await WIKI.extensions.ext[ext.key].isCompatible()
       }
       return exts
+    },
+    async exportStatus () {
+      return {
+        status: WIKI.system.exportStatus.status,
+        progress: Math.ceil(WIKI.system.exportStatus.progress),
+        message: WIKI.system.exportStatus.message,
+        startedAt: WIKI.system.exportStatus.startedAt
+      }
     }
   },
   SystemMutation: {
@@ -260,6 +268,39 @@ module.exports = {
       } catch (err) {
         return graphHelper.generateError(err)
       }
+    },
+
+    /**
+     * Export Wiki to Disk
+     */
+    async export (obj, args, context) {
+      try {
+        const desiredPath = path.resolve(WIKI.ROOTPATH, args.path)
+        // -> Check if export process is already running
+        if (WIKI.system.exportStatus.status === 'running') {
+          throw new Error('Another export is already running.')
+        }
+        // -> Validate entities
+        if (args.entities.length < 1) {
+          throw new Error('Must specify at least 1 entity to export.')
+        }
+        // -> Check target path
+        await fs.ensureDir(desiredPath)
+        const existingFiles = await fs.readdir(desiredPath)
+        if (existingFiles.length) {
+          throw new Error('Target directory must be empty!')
+        }
+        // -> Start export
+        WIKI.system.export({
+          entities: args.entities,
+          path: desiredPath
+        })
+        return {
+          responseResult: graphHelper.generateSuccess('Export started successfully.')
+        }
+      } catch (err) {
+        return graphHelper.generateError(err)
+      }
     }
   },
   SystemInfo: {