Issue with JSON request - rails/faraday - ruby-on-rails

Question

I have an issue with rails and faraday when I try to receive access token which should be included in a JSON response from the external Api.
What I want to do is user authentication based on external API.
I assume that the User already has valid credentials (in this case email as username and password).
Now when he connects to my Api, I send JSON request to the external Api to verify whether this user is valid and wait for access token.
Once the access token is sent in a response, user authentication is successful and I have access to the other endpoints
This is my controller
module Api
class AuthenticationController < ApplicationController
def create
client = XXX::AuthClient.new
response = client.authenticate(
email: params[:email],
password: params[:password]
)
api_client = XXX::Client.new(response[:access_token])
if response[:access_token]
api_user = api_client.get_user()
if api_user["id"]
db_user = User.create(xxx_id: api_user["id"], xxx_access_token: response[:access_token])
end
end
render json: { access_token: db_user.access_token }
end
end
end
And this is my AuthClient service
class AuthClient
def initialize
#http_client = Faraday.new('https://auth.xxx.com/')
end
def authenticate(email:, password:)
headers = {
'Content-Type': 'application/json'
}.to_json
body = {
grant_type: "password",
username: email,
password: password,
client_id: "particularclientid",
client_secret: "particularclientsecret"
}.to_json
api_response = http_client.post("/oauth2/token", body)
response = JSON.parse(api_response.body)
if response["access_token"]
{ access_token: access_token }
else
{ error: "autentication error" }
end
end
private
attr_reader :http_client
end
end
What I know is that curl in the following format is correct and I can see User's access token, refresh token etc.
curl -X POST -H "Content-Type: application/json" -d '{
"grant_type": "password",
"username": "test+user#example.com",
"password": "examplepassword",
"client_id": "particularclientid",
"client_secret": "particularclientsecret"
}' "https://auth.xxx.com/oauth2/token"
But when I run my curl
curl -X POST -d 'email=test+user#example.com&password=examplepassword' "http://localhost:3000/api/auth"
I see that my request is not correct. But I have no clue where is the problem because header and body are formatted to JSON (I have entered puts headers, puts body and puts response to verify that).
Started POST "/api/auth" for 127.0.0.1 at 2017-03-31 16:42:26 +0200
Processing by Api::AuthenticationController#create as */*
Parameters: {"email"=>"test user#example.com", "password"=>"[FILTERED]"}
{"Content-Type":"application/json"}
{"grant_type":"password","username":"test user#example.com","password":"examplepassword","client_id":"particularclientid","client_secret":"particularclientsecret"}
{"error"=>"invalid_request", "error_description"=>"The request is missing a required parameter, includes an unsupported parameter value, or is otherwise malformed."}
Completed 500 Internal Server Error in 610ms (ActiveRecord: 0.0ms)
NoMethodError (undefined method `access_token' for nil:NilClass):
app/controllers/api/authentication_controller.rb:21:in `create'
Is my request incorrect or the problem exists somewhere else?
I am not experienced developer. Just trying to learn enough to start as a Junior RoR. I tried to find a solution on stack and on different sites but I am stucked. Even faraday docs does not help me much

Answer 1

When URIs are escaped, a + is used as a replacement for whitespace. As such, when your controller un-escapes the URI, the + is changed back into a space. If you want to send a space, use %2B instead.
For your first problem, the error message indicates that db_user is nil when you try to do db_user.access_token. So, either response[:access_token] is nil, api_user["id"] is nil, or User.create failed.
You'll need to put in some debugging to find out where your problem is.