Hash filter for ansible 1.8.x

hash.py

# Hash filter for ansible 1.8.x  

# Note: Ansible 1.9 includes this filter, but since there is no rpm
# for 1.9, this saves the trouble of upgrading by hand.

# This program is free software: you can redistribute it and/or modify                                                                                                                                 
# it under the terms of the GNU General Public License as published by                                                                                                                                   
# the Free Software Foundation, either version 3 of the License, or                                                                                                                                      
# (at your option) any later version.                                                                                                                                                                    
#                                                                                                                                                                                                        
# This program is distributed in the hope that it will be useful,                                                                                                                                        
# but WITHOUT ANY WARRANTY; without even the implied warranty of                                                                                                                                         
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                                                                                                                          
# GNU General Public License for more details.                                                                                                                                                           
#                                                                                                                                                                                                        
# You should have received a copy of the GNU General Public License                                                                                                                                      
# along with this program.  If not, see <http://www.gnu.org/licenses/>.                                                                                                                                  


from ansible import errors

try:
   import hashlib as hl
except ImportError:
    hl = None

def get_hash(data, hashtype='sha1'):
    if not hl:
	raise errors.AnsibleError(
            "hashlib must be installed to use the hash filer")
    try: # see if hash is supported                                                                                                                                                                      
        h = hl.new(hashtype)
    except:
        return None
    h.update(data)
    return h.hexdigest()

class FilterModule (object):
    def filters(self):
        return {"hash": get_hash}