UpdateUser with avatarUpload

This is a curl request from a folder where I have a file `avatar.jpg`:

```
curl localhost:4000/ \
  -F operations='{ "query": "mutation($id: ID!, $file: Upload) { UpdateUser(id: $id, avatarUpload: $file) { id name avatar } }", "variables": { "id": "u3", "file": null } }' \
  -F map='{ "0": ["variables.file"] }' \
  -F 0=@avatar.jpg
```

It uploads the avatar to the public folder. We should

* Write tests
* Change the `user.avatar` url and send it to `/api` in the frontend

backend/package.json

@@ -106,4 +106,4 @@
     "nodemon": "~1.19.0",
     "supertest": "~4.0.2"
   }
-}
+}

backend/src/graphql-schema.js

@@ -12,6 +12,7 @@ import rewards from './resolvers/rewards.js'
 import socialMedia from './resolvers/socialMedia.js'
 import notifications from './resolvers/notifications'
 import comments from './resolvers/comments'
+import users from './resolvers/users'
 
 export const typeDefs = fs
   .readFileSync(
@@ -36,6 +37,7 @@ export const resolvers = {
     ...rewards.Mutation,
     ...socialMedia.Mutation,
     ...notifications.Mutation,
-    ...comments.Mutation
+    ...comments.Mutation,
+    ...users.Mutation
   }
 }

backend/src/middleware/validation/index.js

@@ -3,7 +3,7 @@ import { UserInputError } from 'apollo-server'
 const USERNAME_MIN_LENGTH = 3
 
 const validateUsername = async (resolve, root, args, context, info) => {
-  if (args.name && args.name.length >= USERNAME_MIN_LENGTH) {
+  if (!('name' in args) || args.name && args.name.length >= USERNAME_MIN_LENGTH) {
     /* eslint-disable-next-line no-return-await */
     return await resolve(root, args, context, info)
   } else {

backend/src/resolvers/users.js

@@ -0,0 +1,29 @@
+import { neo4jgraphql } from 'neo4j-graphql-js'
+import { createWriteStream } from 'fs'
+
+
+const storeUpload = ({ stream, fileLocation}) =>
+  new Promise((resolve, reject) =>
+    stream
+    .pipe(createWriteStream(`public${fileLocation}`))
+    .on("finish", () => resolve())
+    .on("error", reject)
+  );
+
+export default {
+  Mutation: {
+    UpdateUser: async (object, params, context, resolveInfo) => {
+      const { avatarUpload } = params
+
+      if (avatarUpload) {
+        const { stream, filename } = await avatarUpload ;
+        const fileLocation = `/uploads/${filename}`
+        await storeUpload({ stream, fileLocation });
+        delete params.avatarUpload
+
+        params.avatar = fileLocation
+      }
+      return await neo4jgraphql(object, params, context, resolveInfo, false)
+    }
+  },
+};

backend/src/schema.graphql

@@ -1,3 +1,5 @@
+scalar Upload
+
 type Query {
   isLoggedIn: Boolean!
   # Get the currently logged in User based on the given JWT Token
@@ -18,6 +20,7 @@ type Query {
   )
   CommentByPost(postId: ID!): [Comment]!
 }
+
 type Mutation {
   # Get a JWT Token for the given Email and password
   login(email: String!, password: String!): String!
@@ -99,6 +102,7 @@ type User {
   slug: String
   password: String!
   avatar: String
+  avatarUpload: Upload
   deleted: Boolean
   disabled: Boolean
   disabledBy: User @relation(name: "DISABLED", direction: "IN")