How to encrypt a single element if a JSON response in Mule? - encryption

Question

I have a JSON message say
{"menu": {
"id": "file",
"value": "File",
"popup": {
"menuitem": [
{"value": "New", "onclick": "CreateNewDoc()"},
{"value": "Open", "onclick": "OpenDoc()"},
{"value": "Close", "onclick": "CloseDoc()"}
]
}
}}
I would want to encrypt on the Id field in the JSON like below.
{"menu": {
"id": "98jshr0837#",
"value": "File",
"popup": {
"menuitem": [
{"value": "New", "onclick": "CreateNewDoc()"},
{"value": "Open", "onclick": "OpenDoc()"},
{"value": "Close", "onclick": "CloseDoc()"}
]
}
}}
I use the below code for encryption:
<flow name="hf-eai-crm-plan-search-detail-api-flow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/>
<byte-array-to-string-transformer doc:name="Byte Array to String"/>
<json:object-to-json-transformer doc:name="Object to JSON"/>
<logger message="#[message.payload.menu.id]" level="INFO" doc:name="Logger"/>
<encryption:decrypt config-ref="Encryption" doc:name="Encryption"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
</flow>
Let me know how this can be achieved?

Answer 1

I have modified your flow a bit and able to get encrypted value of a single element as follows :-
<flow name="hf-eai-crm-plan-search-detail-api-flow" doc:name="hf-eai-crm-plan-search-detail-api-flow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/>
<object-to-string-transformer doc:name="Object to String"/>
<json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object"/>
<logger message="before encryption #[message.payload.menu.id]" level="INFO" doc:name="Logger"/>
<encryption:encrypt config-ref="Encryption" doc:name="Encryption" using="JCE_ENCRYPTER" input-ref="#[message.payload.menu.id]"/>
<logger message="After encryption #[message.payload]" level="INFO" doc:name="Logger"/>
<encryption:decrypt config-ref="Encryption" using="JCE_ENCRYPTER" doc:name="Decrypt the xml payload" />
<logger message="Element After Decryption :- #[message.payload]" level="INFO" category="NormalEncryption" doc:name="Logger"/>
</flow>
You can see in the below screenshots for your reference :-
I have also decrypted to show you the value of element
EDITED Solution
Well, there is an attribute xpath in <encryption/> which can be used to encrypt an element in XML. But unfortunately, I didn't find anything for JSON that can parse it and encrypt an element from it... So I created the following 2 solutions for you :-
Solution1:-
<http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8081" doc:name="HTTP Listener Configuration"/>
<encryption:config name="Encryption" enableLanguage="true" doc:name="Encryption">
<encryption:jce-encrypter-config algorithm="CAST5" key="poso123456789lal" />
</encryption:config>
<flow name="hf-eai-crm-plan-search-detail-api-flow" >
<http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/>
<object-to-string-transformer doc:name="Object to String"/>
<json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object"/>
<set-variable doc:name="Variable" value="#[message.payload.menu.value]" variableName="value"/>
<set-variable doc:name="Variable" value="#[message.payload.menu.popup]" variableName="popup"/>
<logger message="before encryption #[message.payload.menu.id]" level="INFO" doc:name="Logger"/>
<encryption:encrypt config-ref="Encryption" doc:name="Encryption" using="JCE_ENCRYPTER" input-ref="#[message.payload.menu.id]"/>
<set-variable doc:name="Variable" value="#[message.payload]" variableName="id"/>
<logger message="Encryption #[message.payload]" level="INFO" doc:name="Logger"/>
<expression-transformer
expression="#[[
'menu':[
'id': flowVars.id,
'value': flowVars.value,
'popup': flowVars.popup
]
]
]" doc:name="Expression"/>
<json:object-to-json-transformer doc:name="Object to JSON"/>
<logger message="After encryption #['\n' + message.payload]" level="INFO" doc:name="Logger"/>
</flow>
Here you can see I have parsed the JSON payload and saved each element value in variables, and then using the variables I am able to construct the JSON you required dynamically using Expression Transformer and also included the encrypted element in it.
Alternate Solution :-
<flow name="hf-eai-crm-plan-search-detail-api-flow" >
<http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/>
<object-to-string-transformer doc:name="Object to String"/>
<json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object"/>
<set-variable doc:name="Variable" value="#[message.payload]" variableName="myPayload"/>
<logger message="before encryption #[message.payload.menu.id]" level="INFO" doc:name="Logger"/>
<set-variable doc:name="Variable" value="#[message.payload]" variableName="id"/>
<encryption:encrypt config-ref="Encryption" doc:name="Encryption" using="JCE_ENCRYPTER" input-ref="#[message.payload.menu.id]"/>
<logger message="Encryption #[message.payload] " level="INFO" doc:name="Logger"/>
<expression-transformer expression="#[flowVars.myPayload.menu.id=message.payload;flowVars.myPayload]" />
<json:object-to-json-transformer doc:name="Object to JSON"/>
<json:object-to-json-transformer doc:name="Object to JSON"/>
</flow>​
Here you can see, using Expression transformer, I am able to update only the element I required to encrypt
So using any of the above solution you will get to encrypt the element you require in the JSON as below :-
Hope this help :)

Answer 2

To keep the payload we can utilize Message Enricher. Please refer to the following configuration, it might meet your purpose:
<flow name="hf-eai-crm-plan-search-detail-api-flow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/encrypt" doc:name="HTTP" allowedMethods="POST" />
<json:json-to-object-transformer returnClass="java.util.Map" doc:name="JSON to Object" />
<logger message="The JSON before encryption: #[payload]" level="INFO" doc:name="Logger - initial" />
<enricher source="#[payload]" target="#[payload.menu.id]" doc:name="Message Enricher">
<encryption:encrypt config-ref="Encryption" input-ref="#[message.payload.menu.id]" using="JCE_ENCRYPTER" doc:name="Encryption"/>
</enricher>
<logger message="The JSON after encryption: #[payload]" level="INFO" doc:name="Logger - id encrypted" />
<enricher source="#[payload]" target="#[payload.menu.id]" doc:name="Message Enricher">
<encryption:decrypt config-ref="Encryption" input-ref="#[payload.menu.id]" using="JCE_ENCRYPTER" doc:name="Decryption"/>
</enricher>
<logger message="The JSON after decryption: #[payload]" level="INFO" doc:name="Logger - decrypted (back to original)" />
</flow>
The result of this configuration is:

Answer 3

Without JSON to Object transformer, just modifying your configuration and add a little bit tricky String manipulation:
<flow name="hf-eai-crm-plan-search-detail-api-flow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/encrypt" doc:name="HTTP" allowedMethods="POST" />
<byte-array-to-string-transformer doc:name="Byte Array to String"/>
<json:object-to-json-transformer doc:name="Object to JSON"/>
<logger message="The JSON before encryption: #[payload]" level="INFO" doc:name="Logger - initial" />
<set-variable variableName="jsonOriginal" value="#[payload]" doc:name="Keep the original JSON"/>
<set-payload value="#[json:menu]" doc:name="Set Payload with JSON menu"/>
<set-variable variableName="idValue" value="#[json:id]" doc:name="Get value of id"/>
<encryption:encrypt config-ref="Encryption" input-ref="#[flowVars.idValue]" using="JCE_ENCRYPTER" doc:name="Encryption"/>
<logger message="The id after encryption: #[payload]" level="INFO" doc:name="Logger - id encrypted" />
<set-payload value="#[flowVars.jsonOriginal.replaceAll("\"id\": \"" + flowVars.idValue + "\"", "\"id\": \"" + payload + "\"")]" doc:name="Set Payload"/>
<logger message="The JSON after encryption: #[payload]" level="INFO" doc:name="Final JSON" />
</flow>
Following is the result: