How to retrieve all key-value pairs avoiding key duplication from JSON in Groovy script-CodePudding

I am totally new to groovy script and would like some help to solve this out. I have a JSON response I want to manipulate and get desired parameters back by avoiding duplication. The Json response does not have indexes like 0,1,2.. that I can iterate through.

Here is the response that I want to work with:

{
"AuthenticateV2" : {
  "displayName" : "Verification of authentication",
  "description" : "notification ",
  "smsTemplate" : "authentication.v2.0_sms",
  "emailHeaderTemplate" : "v2.0_header",
  "emailBodyTemplate" : "html",
  "parameters" : {
     "displayName" : "USER_DISPLAY_NAME",
     "actionTokenURL" : "VERIFICATION_LINK",
     "customToken" : "VERIFICATION_CODE"
  },
  "supportedPlans" : [
     "connectGo"
  ]
},
"PasswordRecovery" : {
  "displayName" : "Verification of password recovery",
  "description" : "notification",
  "smsTemplate" : "recovery.v1.0_sms",
  "emailHeaderTemplate" : "recovery.v1.0_header",
  "emailBodyTemplate" : "recovery.v1.0_body_html",
  "parameters" : {
     "displayName" : "USER_DISPLAY_NAME",
     "actionTokenURL" : "VERIFICATION_LINK",
     "customToken" : "VERIFICATION_CODE",
     "adminInitiated" : false,
     "authnId" : "AUTHENTICATION_IDENTIFIER",
     "authnType" : "EMAIL",
     "user" : {
        "displayName" : "USER_DISPLAY_NAME"
     }
  },
  "supportedPlans" : [
     "connectGo"
  ]
},
"PasswordReset" : {
  "displayName" : "password reset",
  "description" : "notification",
  "smsTemplate" : "recovery.v1.0_sms",
  "emailHeaderTemplate" : "recovery.v1.0_header",
  "emailBodyTemplate" : "html",
  "parameters" : {
     "displayName" : "USER_DISPLAY_NAME",
     "user" : {
        "displayName" : "USER_DISPLAY_NAME"
     }
  }

The expected output that I want to have:

{
     "displayName" : "USER_DISPLAY_NAME",
     "actionTokenURL" : "VERIFICATION_LINK",
     "customToken" : "VERIFICATION_CODE",
     "customToken" : "VERIFICATION_CODE",
     "adminInitiated" : false,
     "authnId" : "AUTHENTICATION_IDENTIFIER",
     "authnType" : "EMAIL"
  }

I need to retrieve all fields under parameters tag and also want to avoid duplication

CodePudding user response：

You should first get familiar with parsing and producing JSON in Groovy.

Then, assuming the provided response is a valid JSON (it's not - there are 2 closing curlies (}) missing at the end) to get all the parameters keys merged into one JSON we have to convert the JSON string into a Map object first using JsonSlurper:

def validJsonResponse = '<your valid JSON string>'
Map parsedResponse = new JsonSlurper().parseText(validJsonResponse) as Map

Now, when we have a parsedResponse map we can iterate over all the root items in the response and transform them into the desired form (which is all the unique parameters keys) using Map::collectEntries method:

Map uniqueParameters = parsedResponse.collectEntries { it.value['parameters'] }

Finally, we can convert the uniqueParameters result back into a pretty printed JSON string using JsonOuput:

println JsonOutput.prettyPrint(JsonOutput.toJson(uniqueParameters))

After applying all the above we'll get the output

{
    "displayName": "USER_DISPLAY_NAME",
    "actionTokenURL": "VERIFICATION_LINK",
    "customToken": "VERIFICATION_CODE",
    "adminInitiated": false,
    "authnId": "AUTHENTICATION_IDENTIFIER",
    "authnType": "EMAIL",
    "user": {
        "displayName": "USER_DISPLAY_NAME"
    }
}

If you want to get rid of user entry from the final output just remove it from the resulting uniqueParameters map (uniqueParameters.remove('user')) before converting it back to JSON string.