Nifi InvokeHTTP to get a token from an API

[#1]

I have curl command as below.

curl -s -XPOST -H "Accept: application/json" -H "Content-Type: application/x-www-form-urlencoded" -d 'username=usco&password=asdl2342&client_id=dwer234324-2sd2-32dwq&scope=read' 'https://rest.abc.com/security'

I am trying to replicate this in Nifi. I am trying to figure out how and where the above options to be provided in InvokeHTTP processor. I have gone through the articles and some mentioned I have to define it in body of flow file. But I couldn't understand what exactly goes into body and what goes into extra attributes (if I need to add) in InvokeHTTP processsor.

[#2 · Accepted solution]

@RC

Here is what I think you should use to make this work:

-X POST	use processor HTTP method attribute and set to POST
-x http://proxyhost:port	I think you should consider adding this configuration or add properties Proxy host=proxyhost, Proxy port=port and Proxy protocol=https
-H "Accept: application/json"	Use the Attributes to send referencing a new attribute with the value (add 1 extra attributes with corresponding value)
-H "Content-Type: application/x-www-form-urlencoded"	Use Content type attribute
-d 'data sent'	Send Message Body = true. And the content should come as inbound flowfile to the processor. To test try adding a GenerateFlowFile processor with the content without single quotes
https://hostname/security/v1/oauth/token	Set in Remote url

Finally since endpoint is ssl enabled you need to set SSL Context Service.

HTH

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[#3]

Attached is the screenshot for the solution 

E2E FlowGenerate Flow FileInvokeHttp.

[#4]

@Felix Albani

Thank you very much. that worked perfectly. I have one more question. What if I have one more header such as -H "Authorization: Bearer 27ffdfada34982-1123qwdq2" . How do I send it ?
Should I be adding one more property and set the name as 'Authorization and Value as Bearer 27ffdfada34982-1123qwdq2 ?

or

Can I specify more than one attribute in AttributestoSend in InvokeHTTP processor ? If yes, should they be seperated by comma or space or something else ?

[#5]

@RC Based on the documentation is a regular expression:

Regular expression that defines which attributes to send as HTTP headers in the request.

perhaps you can name your list of attributes:

httpheader1<br>httpheader2<br>httpheaderN

then use a regex like this httpheader[1-N]

HTH

[#6]

I have added Accept and Authorization in UpdateAttribute processor before InovkeHTTP processor and in the Attributes to Send property (in InovkeHTTP) - I have used .*

[#7]

Hi @karteek_chunchu 
I am also working on Authorization: Bearer, Could you please me know how you added this token in invoke HTTP processor.

if you have a sample template, what are the configurations needed for this, can you please let me know.

Thanks,
Venkat

[#8]

@Venkatgundla Hi, as this is an older post, you would have a better chance of receiving a resolution by starting a new thread. This will also be an opportunity to provide details specific to your environment that could aid others in assisting you with a more accurate answer to your question. You can link this thread as a reference in your new post. Thanks!

[#9]

Hello @Venkatgundla,

Did you ever get a response to your question?? 

Thanks,

Declan

[#10]

If you are looking to authenticate using Oath2.0 then you need to create new property in the InvokeHttp processor and call the property "Authorization" and the value should be set as:

"Bearer [Authorization Token]". First you need to get the authentication token. hope that helps.