Adding config file validator

src/application/app.js

@@ -7,6 +7,7 @@ const { sendEmailNotification, zipErrors } = require('./tools/emailNotifications
 const { extractDataForPatients } = require('./tools/mcodeExtraction');
 const { maskMRN } = require('../helpers/patientUtils');
 const { parsePatientIds } = require('../helpers/appUtils');
+const { validateConfig } = require('../helpers/configValidator');
 
 function getConfig(pathToConfig) {
   // Checks pathToConfig points to valid JSON file
@@ -20,7 +21,7 @@ function getConfig(pathToConfig) {
 
 function checkInputAndConfig(config, fromDate, toDate) {
   // Check input args and needed config variables based on client being used
-  const { patientIdCsvPath } = config;
+  validateConfig(config);
 
   // Check if `fromDate` is a valid date
   if (fromDate && !moment(fromDate).isValid()) {
@@ -31,11 +32,6 @@ function checkInputAndConfig(config, fromDate, toDate) {
   if (toDate && !moment(toDate).isValid()) {
     throw new Error('-t/--to-date is not a valid date.');
   }
-
-  // Check if there is a path to the MRN CSV within our config JSON
-  if (!patientIdCsvPath) {
-    throw new Error('patientIdCsvPath is required in config file');
-  }
 }
 
 async function mcodeApp(Client, fromDate, toDate, pathToConfig, pathToRunLogs, debug, allEntries) {

src/helpers/configValidator.js

@@ -0,0 +1,20 @@
+const Ajv = require('ajv');
+const metaSchema = require('ajv/lib/refs/json-schema-draft-06.json');
+const logger = require('./logger');
+const configSchema = require('./schemas/config.schema.json');
+
+const ajv = new Ajv({ logger: false, allErrors: true });
+ajv.addMetaSchema(metaSchema);
+const validator = ajv.addSchema(configSchema, 'config');
+
+function validateConfig(config) {
+  logger.debug('Validating config file');
+  const valid = validator.validate('config', config);
+  const errors = ajv.errorsText(validator.errors, { dataVar: 'config' });
+  if (!valid) throw new Error(`Error(s) found in config file: ${errors}`);
+  logger.debug('Config file validated successfully');
+}
+
+module.exports = {
+  validateConfig,
+};

src/helpers/schemas/config.schema.json

@@ -1,6 +1,6 @@
 {
   "$id": "csv-config",
-  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$schema": "http://json-schema.org/draft-06/schema#",
   "description": "Schema for mcode-extraction-framework config files",
   "type": "object",
   "properties": {

test/application/app.test.js

@@ -20,17 +20,19 @@ describe('App Tests', () => {
   });
 
   describe('checkInputAndConfig', () => {
+    const config = { patientIdCsvPath: '', extractors: [] };
     it('should throw error when fromDate is invalid.', () => {
-      expect(() => checkInputAndConfig(testConfig, '2020-06-31')).toThrowError('-f/--from-date is not a valid date.');
+      expect(() => checkInputAndConfig(config, '2020-06-31')).toThrowError('-f/--from-date is not a valid date.');
     });
     it('should throw error when toDate is invalid date.', () => {
-      expect(() => checkInputAndConfig(testConfig, '2020-06-30', '2020-06-31')).toThrowError('-t/--to-date is not a valid date.');
+      expect(() => checkInputAndConfig(config, '2020-06-30', '2020-06-31')).toThrowError('-t/--to-date is not a valid date.');
     });
-    it('should throw error when patientIdCsvPath not provided in config', () => {
-      expect(() => checkInputAndConfig({})).toThrowError('patientIdCsvPath is required in config file');
+    it('should throw error when config is not valid', () => {
+      expect(() => checkInputAndConfig({}))
+        .toThrowError('Error(s) found in config file: config should have required property \'patientIdCsvPath\', config should have required property \'extractors\'');
     });
     it('should not throw error when all args are valid', () => {
-      expect(() => checkInputAndConfig(testConfig, '2020-06-01', '2020-06-30')).not.toThrowError();
+      expect(() => checkInputAndConfig(config, '2020-06-01', '2020-06-30')).not.toThrowError();
     });
   });
 });

test/helpers/configValidator.test.js

@@ -0,0 +1,24 @@
+const { validateConfig } = require('../../src/helpers/configValidator.js');
+
+describe('validateConfig', () => {
+  const missingPropertyConfig = { patientIdCsvPath: '' };
+  const wrongTypeConfig = { patientIdCsvPath: '', extractors: 12 };
+  const wrongFormatConfig = { patientIdCsvPath: '', extractors: [], commonExtractorArgs: { baseFhirUrl: 'wrong' } };
+  const validConfig = { patientIdCsvPath: '', extractors: [] };
+
+  test('Should throw error when config file is missing required property', () => {
+    expect(() => validateConfig(missingPropertyConfig)).toThrowError('Error(s) found in config file: config should have required property \'extractors\'');
+  });
+
+  test('Should throw error when property is of incorrect type', () => {
+    expect(() => validateConfig(wrongTypeConfig)).toThrowError('Error(s) found in config file: config.extractors should be array');
+  });
+
+  test('Should throw error when property has incorrect format', () => {
+    expect(() => validateConfig(wrongFormatConfig)).toThrowError('Error(s) found in config file: config.commonExtractorArgs.baseFhirUrl should match format "uri"');
+  });
+
+  test('Should not throw error when config file is valid', () => {
+    expect(() => validateConfig(validConfig)).not.toThrow();
+  });
+});