Get a list of user Resources that match a username string and have browse permission for the issue or project.

        :param user: a string to match usernames against.
        :type user: str
        :param issueKey: find users with browse permission for this issue.
        :type issueKey: Optional[str]
        :param projectKey: find users with browse permission for this project.
        :type projectKey: Optional[str]
        :param startAt: index of the first user to return. (Default: 0)
        :type startAt: int
        :param maxResults: maximum number of users to return.
                If maxResults evaluates as False, it will try to get all items in batches. (Default: 50)
        :type maxResults: int

def search_allowed_users_for_issue(self, user, issueKey=None, projectKey=None, startAt=0, maxResults=50):
        """Get a list of user Resources that match a username string and have browse permission for the issue or project.

        :param user: a string to match usernames against.
        :type user: str
        :param issueKey: find users with browse permission for this issue.
        :type issueKey: Optional[str]
        :param projectKey: find users with browse permission for this project.
        :type projectKey: Optional[str]
        :param startAt: index of the first user to return. (Default: 0)
        :type startAt: int
        :param maxResults: maximum number of users to return.
                If maxResults evaluates as False, it will try to get all items in batches. (Default: 50)
        :type maxResults: int
        """
        params = {
            'username': user}
        if issueKey is not None:
            params['issueKey'] = issueKey
        if projectKey is not None:
            params['projectKey'] = projectKey
        return self._fetch_pages(User, None, 'user/viewissue/search', startAt, maxResults, params)