Generate random token number

[#1]

I would like to generate a random token number something like UUID.randomUUID().

Is there a provision to generate or something java script equivalent.

[ceber · Accepted solution]

EDIT

While the original answer here still *works*, there is a better, probably easier way. You can use AssignMessage.

<AssignMessage name='AM-1'>
  <AssignVariable>
    <Name>uuid</Name>
    <Template>{createUuid()}</Template>
  </AssignVariable>
</AssignMessage>

---

original answer (2016)

Javascript can generate rfc4122-compliant guids. One example: https://gist.github.com/Nickdouille/8644841

I've done similar in a javascript policy without issue.

[ceber · Accepted solution]

EDIT

While the original answer here still *works*, there is a better, probably easier way. You can use AssignMessage.

<AssignMessage name='AM-1'>
  <AssignVariable>
    <Name>uuid</Name>
    <Template>{createUuid()}</Template>
  </AssignVariable>
</AssignMessage>

---

original answer (2016)

Javascript can generate rfc4122-compliant guids. One example: https://gist.github.com/Nickdouille/8644841

I've done similar in a javascript policy without issue.

[#4]

I tried but everytime the variable gets assigned to NaN

[DChiesa]

Hi @Hemanth - can you show your code?

[#6]

Thanks Dino, it is working. It was a simple mistake from my end.

[anilsr]

@Hemanth , Did you get a chance to look at similar discussion in S.O here ? Do you see any issue implementing same in Apigee ?

[#8 · Accepted solution]

You could try something like this:

var transactionId = "";
transactionId = generateUUID();

function generateUUID(){
    var d = new Date().getTime();
    var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = (d + Math.random()*16)%16 | 0;
        d = Math.floor(d/16);
        return (c=='x' ? r : (r&0x7|0x8)).toString(16);
    });
    return uuid;
}

[manchalachiranj]

@Meghdeep Basu

can you pls explain the logic how below logic works:

function generateUUID(){var d =newDate().getTime();var uuid ='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g,function(c){var r =(d +Math.random()*16)%16|0;
        d =Math.floor(d/16);return(c=='x'? r :(r&0x7|0x8)).toString(16);});

[dchiesa1]

it's using the date as an input to derive random digits.

Each x in the source string is replaced with a random hex digit.

[DChiesa]

Just curious - what do you need the random number FOR ?

There is a messageid context variable which is unique to each inbound message, and maybe random enough. It may be suitable for your needs.

[#12]

Well this is to generate a token, basically to handle cross talk issue.

[ayushjain]

@Meghdeep Basu @Hemanth

Instead of adding so much custom logic you can directly use Apigee Message Template which provides a createUuid function which can be plugged in AssignMessage policy to generate your Uuid without any custom logic

Reference :

https://docs.apigee.com/api-platform/reference/message-template-intro#create-uuid-function

[dchiesa1]

This is a good comment... The createUuid is one of the functions that has been added since the time this Q was originally posted.

There is also a randomLong function available in the MessageTemplate as well.

example:

<AssignMessage name='AM-1'>
  <IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>
  <AssignVariable>
    <Name>my_uuid</Name>
    <Template>{createUuid()}</Template>
  </AssignVariable>

  <AssignVariable>
    <Name>my_random</Name>
    <Template>{randomLong(1000,10000)}</Template>
  </AssignVariable>
</AssignMessage>