setup middleware for language detection

backend/package.json

@@ -69,6 +69,7 @@
     "helmet": "~3.22.0",
     "ioredis": "^4.16.1",
     "jsonwebtoken": "~8.5.1",
+    "languagedetect": "^2.0.0",
     "linkifyjs": "~2.1.8",
     "lodash": "~4.17.14",
     "merge-graphql-schemas": "^1.7.7",

backend/src/middleware/index.js

@@ -14,6 +14,7 @@ import notifications from './notifications/notificationsMiddleware'
 import hashtags from './hashtags/hashtagsMiddleware'
 import email from './email/emailMiddleware'
 import sentry from './sentryMiddleware'
+import languages from './languages/languages'
 
 export default (schema) => {
   const middlewares = {
@@ -30,6 +31,7 @@ export default (schema) => {
     softDelete,
     includedFields,
     orderBy,
+    languages,
   }
 
   let order = [
@@ -39,6 +41,7 @@ export default (schema) => {
     // 'activityPub', disabled temporarily
     'validation',
     'sluggify',
+    'languages',
     'excerpt',
     'email',
     'notifications',

backend/src/middleware/languages/languages.js

@@ -0,0 +1,24 @@
+import LanguageDetect from 'languagedetect'
+
+const setPostLanguage = (text) => {
+  console.log(text)
+  const lngDetector = new LanguageDetect()
+  lngDetector.setLanguageType('iso2')
+  const result = lngDetector.detect(text, 2)
+  console.log(result)
+  return result[0][0]
+}
+
+export default {
+  Mutation: {
+    CreatePost: async (resolve, root, args, context, info) => {
+      console.log('CreatePost, language', args)
+      args.language = await setPostLanguage(args.content)
+      return resolve(root, args, context, info)
+    },
+    UpdatePost: async (resolve, root, args, context, info) => {
+      args.language = await setPostLanguage(args.content)
+      return resolve(root, args, context, info)
+    },
+  },
+}

backend/src/middleware/languages/languages.spec.js

@@ -0,0 +1,74 @@
+import Factory, { cleanDatabase } from '../../db/factories'
+import { gql } from '../../helpers/jest'
+import { getNeode, getDriver } from '../../db/neo4j'
+import createServer from '../../server'
+import { createTestClient } from 'apollo-server-testing'
+
+
+let mutate
+let authenticatedUser
+let variables
+
+const driver = getDriver()
+const neode = getNeode()
+
+beforeAll(async () => {
+  const { server } = createServer({
+    context: () => {
+      return {
+        driver,
+        neode,
+        user: authenticatedUser,
+      }
+    },
+  })
+  mutate = createTestClient(server).mutate
+  await cleanDatabase()
+  variables = {}
+  const user = await Factory.build('user')
+  authenticatedUser = await user.toJson()
+  await Factory.build('category', {
+    id: 'cat9',
+    name: 'Democracy & Politics',
+    icon: 'university',
+  })
+})
+
+
+afterAll(async () => {
+  //await cleanDatabase()
+})
+
+
+const createPostMutation = gql`
+  mutation($title: String!, $content: String!, $categoryIds: [ID]) {
+    CreatePost(title: $title, content: $content, categoryIds: $categoryIds) {
+      language
+    }
+  }
+`
+
+describe('languagesMiddleware', () => {
+  variables = {
+    title: 'Test post languages',
+    categoryIds: ['cat9'],
+  }
+
+  it('detects German', async () => {
+    variables = {
+      ...variables,
+      content: 'Jeder sollte vor seiner eigenen Tür kehren.',
+    }
+    await expect(mutate({
+      mutation: createPostMutation,
+      variables,
+    })).resolves.toMatchObject({
+      data: {
+        CreatePost: {
+          language: 'de',
+        },
+      },
+    })
+  })
+  
+})

backend/yarn.lock

@@ -6302,6 +6302,11 @@ knuth-shuffle-seeded@^1.0.6:
   dependencies:
     seed-random "~2.2.0"
 
+languagedetect@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/languagedetect/-/languagedetect-2.0.0.tgz#4b8fa2b7593b2a3a02fb1100891041c53238936c"
+  integrity sha512-AZb/liiQ+6ZoTj4f1J0aE6OkzhCo8fyH+tuSaPfSo8YHCWLFJrdSixhtO2TYdIkjcDQNaR4RmGaV2A5FJklDMQ==
+
 latest-version@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/latest-version/-/latest-version-3.1.0.tgz#a205383fea322b33b5ae3b18abee0dc2f356ee15"