compare template tags with received fields

package.json

@@ -13,6 +13,7 @@
     "express": "~4.16.1",
     "http-errors": "~1.6.3",
     "jalali-moment": "^3.3.10",
+    "lodash": "^4.17.21",
     "morgan": "~1.9.1",
     "persianjs": "^0.4.0",
     "pg": "^8.5.1",

tools/docxtemp.js

@@ -2,6 +2,7 @@ const PizZip = require('pizzip');
 const Docxtemplater = require('docxtemplater');
 const fs = require('fs');
 const path = require('path');
+const _ = require("lodash");
 
 // The error object contains additional information when logged with JSON.stringify (it contains a properties object containing all suberrors).
 function replaceErrors(key, value) {
@@ -30,26 +31,69 @@ function errorHandler(error) {
     throw error;
 }
 
+class InspectModule {
+    constructor() {
+        this.inspect = {};
+    }
+    set(obj) {
+        if (obj.inspect) {
+            this.inspect = _.merge({}, this.inspect, obj.inspect);
+        }
+    }
+}
+
+const getTags = function (postParsed) {
+    return postParsed.filter(function (part) {
+        return part.type === "placeholder";
+    }).reduce(function (tags, part) {
+        tags[part.value] = {};
+        if (part.subparsed) {
+            tags[part.value] = getTags(part.subparsed);
+        }
+        return tags;
+    }, {});
+}
+
 module.exports = function (templateInfo, fileName) {
     return new Promise((resolve, reject) => {
+
+        //check empty fields
         for (const key in templateInfo) {
             if (!templateInfo[key]) {
              throw({
                 eCode: 406,
-                eText: 'empty  fields'
+                eText: 'هیچ یک از فیلدها نباید خالی باشند'
              })
             }
           }
+
         let content = fs.readFileSync(path.resolve(__dirname, `../template/${fileName}`), 'binary');
         let zip = new PizZip(content);
         let doc;
-
+        let inspectModule = new InspectModule();
+       
         try {
-            doc = new Docxtemplater(zip);
+            doc = new Docxtemplater(zip,{
+                modules: [inspectModule]
+            });
         } catch (error) {
             
             errorHandler(error);
         }
+      
+        let postParsed = inspectModule.inspect.postparsed;
+        let tags = Object.keys(getTags(postParsed))
+        let templateInfoKeys = Object.keys(templateInfo)
+
+        //compare template tags and received fields from client(templateInfo)
+        for(let i = 0; i < tags.length; i++){
+            if(!templateInfoKeys.includes(tags[i]) ){
+                throw({
+                    eCode: 406,
+                    eText: 'اطلاعات وارد شده ناقص است'
+                 })
+            };
+         };
 
         doc.setData(templateInfo);