Problem

You can use Power Actions™ and the Issue Security Scheme to lock an issue and ensure that only the issue assignee can edit it.

Solution

To lock an issue, you must first create two actions: Lock and Unlock. The actions are only visible to the issue assignee.

• The Lock action sets the security level to Locked.

• The Unlock action sets the security level back to none.

Create the security level

Create the security level:

Create the actions

Create the Lock and Unlock actions.

Click Edit conditions. Enter the below scripts for each action.
The Lock button is disabled if the security level is already Locked. The Unlock button is disabled if the security level is blank.

The buttons are only visible to the current assignee.

Lock button condition script

number ENABLED = 1;
number DISABLED = 2;
number HIDDEN = 3;

if( assignee != currentUser()) {
 return HIDDEN;
}

if( securityLevel == "Locked" ){
 	return DISABLED;
}
return ENABLED;

Unlock button condition script

number ENABLED = 1;
number DISABLED = 2;
number HIDDEN = 3;

if( assignee != currentUser()) {
 return HIDDEN;
}

if(isNull(securityLevel)) {
 	return DISABLED;
}
return ENABLED;

Now create the action scripts.

For the Lock button, set the issue security to Locked. For the Unlock button, set it to none.

Lock button script

securityLevel = "Locked";

Unlock button script

 securityLevel = "";

Testing

Now you can test.