Send multiple files via FTP assertion

Products

• STARTER PACK-7
• CA Rapid App Security
• CA API Gateway

Issue/Introduction

I try to send multiple files by using multipart/form-data method from Postman through FTP assertion on CA API gateway. However, it does not work as expected.

 

Environment

Gateway 9.2+ 
 

Resolution

This example developed for a support case, shows how to loop through multiple parts of a form-data message get the file name for each part and upload it to a remote ftp site. 

 

1. Sending multi-part message from PostMan client 

Here is the message we have in PostMan, where we have two .pdf files that are to be part of the posted content : 

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2. Raw http data sent over the wire. 

Using fiddler we can see the raw data that is POST'ed when the message is sent to the gateway server.   Note the Content-Disposition header field that contains the filename :

 

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3. Policy that receives the request. 

The policy that receives the content loops over the ${requests.parts}, and processes each on separately. 

<Please see attached file for image>

We isolate the "dataToSend" as a Message - (we picked application/octet-stream as content-type, as it needed to be hardcoded.  It would have been good to set it from the ${items.current.contentType} but that wasnt possible)

We also extract filename from the Content-Disposition header using regex.  

 

Then we call the "Route Via FTP"  assertion as per : 

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passing in the ${filename} and the ${dataToSend} as the content. 

 

4. Running in the Debugger 

Here we can see the first pdf file being transferred. 

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5. Transferred files 

And on the ftp site we can then see the two transferred files. 

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The policy for the xfer process is attached to this article.