Challenge Cryptocoins

To start the server:

• Install dependencies with mix deps.get
• Create and migrate your database with mix ecto.setup
• Start Phoenix endpoint with mix phx.server

GraphQL API on: localhost:4000/api

Assumptions

• Only loged users can make operations (get, list, invest, refund) on Funds (only on in their name)
• Only admin users can create and update the Funds
• A Fund is created with a amount of tokens, these tokens will have a owner and can be registred on a historic of transactions to see the user profit later
• Funds cannot have the same name
• If the exchanger dont have owned tokens on a Fund, then the user cannot invest in this Fund, dont subtracting nothing from the user (the default is that all tokens when created is owned by the exchanger)
• If the user dont have owned tokens on a Fund, then the user cannot refund in this Fund, dont adding nothing to the user
• A new admin cannot be created from the API (use the login(email: "[email protected]", password: "admin") from the seeds)

Notes

• Dont load the seeds.exs on the test ENV, this will broke the tests
• A web doc can be generated with mix docs
• Code using rules from mix credo and mix dialyzer

Examples

Login

Login as admin:

mutation {
  login(email: "[email protected]", password: "admin") {
    token
  } 
}

Login as normal client

mutation {
  login(email: "[email protected]", password: "test") {
    token
  } 
}

Insert the token on the HTTP Header Authorization Ex: Authorization Bearer SFMyNTY.g2gDdAAAAAFkAAJpZG0AAAAkZTA4YzQzY2UtOWEzZC00NWUzLWE3NDEtYjNhNGIyNzQxYmJibgYA-qa7oHIBYgABUYA.lDLsr-jWc2BftBNGnB-BTazsR15tqqwGOvEi_Fex40g

Fund

List:

{
  me {
    listFunds {
      description
      name
      value
    }
  } 
}

Get:

{
  me {
    getFund(name: "fund 1") {
      description
      name
      value
    }
  } 
}

Create (only as admin):

mutation {
  me {
    createFund(name: "fund 4", value: 20, tokenAmount: 5) {
      description
      name
      value
    }
  }
}

Update (only as admin):

mutation {
  me {
    updateFund(fundName: "fund 1", value: 30) {
      description
      name
      value
    } 
  }
}

Invest:

mutation {
  me {
    invest(fundName: "fund 1", tokenAmount: 1) 
  }
}

Refund:

mutation {
  me {
    refund(fundName: "fund 1", tokenAmount: 1) 
  }
}

Get profit:

{
  me {
    getUserProfit
  }
}