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Great Question, @Lior Karol ,
It's something more than a simple policy. It's combination of Access Entity Policy, Extract Variables Policy, Assign Message Policy , API Product, Developer App, Developer, Developer Attribute, Developer Portal that makes the magic happening.
Please allow me to explain same with an example,
- I have an API like, http://api.xxxxx.com/v1/employee/{employeeId}
- API response gives 15 parameters out of the box
- But, You might want to give 2 parameters as response to Developer Type (Silver)
- You would like to give full 15 parameters to Developer Type (Gold)
- You will create API Product and package above API into API Product in Apigee.
There are multiple ways you can solve this problem, Let's see developer attributes approach,
- Let's say Developers ABC registers in Developer Portal
- You will either manually / automatically assign a developer attribute called "type" = "silver". You can update in Apigee Drupal based Developer Portal using out of the box developer attributes functionality / You can manually edit developer in Edge UI & add this attribute.
- Let's say Developers XYZ registers in Developer Portal , You assign attribute called "type" = "gold"
- Developer ABC registers an App in Developer Portal & Gets the Key 123
- Developer XYZ registers an App in Developer Portal & Gets the Key 456
- Developer ABC presents the key 123 to your API,
- You will use verify api key policy to validate the key
- After the policy, You will have flow variables like developer id / email
- You will use these flow variables & executes access entity policy to retrieve developer information including attributes in request flow.
- In response flow, You will check for attribute type silver or gold using above flow variables & execute policies extract variable policy which extracts 2 parameters, constructs new response object using Assign Message Policy.
- If attribute type is gold, you will just skip the policies extract variables & assign message using policy conditions.
For more details how to use these policies, check Apigee Docs http://docs.apigee.com/ or Learn quickly using Apigee 4MV4D videos.
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Anil Sagar
