1) The document discusses using base64 encoding and decoding transformers in Mule to encrypt and decrypt file payloads. 2) It provides an example Mule flow that uses a base64 encoder transformer to encrypt a file, and another flow using a base64 decoder transformer to decrypt the file back to its original contents. 3) The example demonstrates picking up a file, encrypting it with base64 encoding, writing it to a new location, then decrypting and writing the original file contents back with base64 decoding.

1. By Anirban Sen Chowdhary

3. .

4. Fortunately we have base64-encoder-transformer and base64-
decoder-transformer available in our Mule

5. So, to encrypt a payload in our Mule flow, we can use
base64-encoder-transformer as follows :-
As you can see we have used a file inbound to pick a file in our flow,
and then we encrypt it with base64-encoder-transformer and the
output of the flow will produce a encrypted file

6. Our corresponding Mule flow will be as follows :-
<flow name="encryptFlow1" doc:name="encryptFlow1">
<file:inbound-endpoint path="E:backuptest"
responseTimeout="10000" doc:name="File">
<file:filename-regex-filter pattern="abc.doc"
caseSensitive="false" />
</file:inbound-endpoint>
<base64-encoder-transformer encoding="utf8" />
<logger level="INFO" message="#[message.payloadAs(java.lang.String)]" />
<file:outbound-endpoint path="E:backuptestnewfolder"
responseTimeout="10000" doc:name="File" />
</flow>

7. As you can see in the code it will pick a file called abc.doc from
E:backuptest location , encrypt it and put the encrypted file to
E:backuptestnewfolder
So, let us place a file abc.doc in the source folder as follows :-

8. Let run our application and we can see, the file has been
transferred to location E:backuptestnewfolder
Now, this transferred file is an encrypted file

9. We can see our compressed file here in location
E:backuptestnewfolder :-

10. Now if we open the file abc.doc in E:backuptestnewfolder
we will find the content of the file is in encrypted form as
follows:-

11. Now what about decrypting the file back to the original content
???

12. In case of decrypting a file back to original content ( content
before the encryption) we will be using base64-decoder-
transformer as follows:-
As you can see, it will pick up the encrypted file abc.doc from the
location E:backuptestnewfolder and put it into a new location
E:backuptestoriginalFile

13. The corresponding our Mule flow will be :-
<flow name="decrypt">
<file:inbound-endpoint path="E:backuptestnewfolder"
responseTimeout="10000" doc:name="File">
<file:filename-regex-filter pattern="abc.doc"
caseSensitive="false" />
</file:inbound-endpoint>
<base64-decoder-transformer encoding="utf8" />
<file:outbound-endpoint path="E:backuptestoriginalFile"
responseTimeout="10000" doc:name="File" />
</flow>

14. Now if we run the flow, we will get the following in our console :-
The file has been decrypted back to it’s original content into the
location E:backuptestoriginalFile

15. Now if we open the decrypted file we will get a normal content:-

16. Hope you enjoyed the tips of compressing and decompressing using
base64-encoder-transformer/base64-decoder-transformer in Mule
Next slide I will bring some more simple yet interesting topic