Home Rack custom middleware giving error "ActionDispatch::Http::Parameters::ParseError"
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Rack custom middleware giving error "ActionDispatch::Http::Parameters::ParseError"

user2140 Published in April 23, 2018, 5:24 pm

I am writing a custom middleware for my rails app, to decrypt/encrypt parameters in a post request. I have configured the middleware in 'config/environments/staging.rb'

config.middleware.use CustomMiddleware

In order to read the request params i am reading the env obj like this

rack_input = env['rack.input'].read

I am able to access the parameter and manipulate as needed. But when i pass over on the env obj to the app object which is the receiver. I am getting


Full error

Error occurred while parsing request parameters.

F, [2017-11-15T02:13:50.230088 #24060] FATAL -- : [9aa25c7e-56e7-4894-ba30-3a01f60ae4fc]   
F, [2017-11-15T02:13:50.230340 #24060] FATAL -- : [9aa25c7e-56e7-4894-ba30-3a01f60ae4fc] ActionDispatch::Http::Parameters::ParseError (no implicit conversion of nil into String):
F, [2017-11-15T02:13:50.230563 #24060] FATAL -- : [9aa25c7e-56e7-4894-ba30-3a01f60ae4fc]   
F, [2017-11-15T02:13:50.230782 #24060] FATAL -- : [9aa25c7e-56e7-4894-ba30-3a01f60ae4fc] app/middleware/custom_middleware.rb:34:in `call'

My code is somewhat like this

class CustomMiddleware
  include Encryption   

  def initialize(app)
    @app = app

  def set_payload_params(env)
    rack_input = env['rack.input'].read
    @args = JSON.parse(rack_input) rescue {}

  def call(env)
    request = Rack::Request.new(env)

    payload = @args['payload']

    status, headers, response = @app.call(env)


If i don't read the env object and hard code the parameters, there is no such parsing error. And my controller is responding with data w.r.t to hardcode parameters.

My Rails version is 5.1.4 My ruby version is 2.4.2

I have done a similar middleware in another rails app(4.2.8) which is working fine.

Any insight on this will be of much help. Thanks in advance.

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