import sys
import boto.s3.connection

#------------------------------------------------------------------------------
HOST_S3 = 'ss3.scayle.es'
PORT_S3 = 443

#------------------------------------------------------------------------------
# FUNCTION:      S3 Connection
# DESCRIPTION:  Connection to Server S3
# PARAMETERS:   accessKey:   Encoded token to access with AD User
#------------------------------------------------------------------------------

def S3Connection (accessKey):
   global conn


   try:
      conn = boto.connect_s3(
        aws_access_key_id=accessKey,
        aws_secret_access_key=accessKey,
        host=HOST_S3,
        port=PORT_S3,
        is_secure=True,
        calling_format=boto.s3.connection.OrdinaryCallingFormat(),
       )
   except:
      print ("AD User with access data <%s> has not privileges or does not exist." % (accessKey))
      sys.exit(-1)

#------------------------------------------------------------------------------
# FUNCTION:  	deleteKey
# DESCRIPTION:  Delete Key associated to bucket
# PARAMETERS:   bucketName	Name of the bucket which contains the key
#               keyName		Key name
#------------------------------------------------------------------------------

def deleteKey (bucketName, bucketKey):

    bFound = False
    try: 
     for bucket in conn.get_all_buckets():
       if (bucket.name == bucketName):
            for key in bucket.list():
              if (key.name == keyName):
                try:
                    bucket.delete_key(key.name)
                    bFound = True
                except:
                    print ("!!! WARNING Key %s on %s bucket can not be deleted. Error %s. " % (keyName, bucket.name, (sys.exc_info()[1])))
                    print ("When CODE is AccessDenied the connection to OpenCayle can be done, please review your AccessKey:")
                    print ("1) Run program s3AccessKey.py")
                    print ("2) Run program s3CheckConnection.py")
                    print ("If problem persists then contact to Scayle through HelpDesk tool.")
                    sys.exit(-3)

    except:
     print ("Connection to OpenCayle can not be done, please review your AccessKey:")
     print ("1) Run program s3AccessKey.py")
     print ("2) Run program s3CheckConnection.py")
     print ("If problem persists then contact to Scayle through HelpDesk tool.")
     sys.exit (-4)

    if (bFound  == False):
       print ("Bucket %s or Key %s associated to this bucket does not exist. Please review your S3 data." % (bucketName,keyName))
       sys.exit(-2)

#########################################################################################################
# PROGRAM
#########################################################################################################
# -----------------------------  PARAMETERS EVALUATION -----------------------------

if len(sys.argv) >= 4:
        accessKey = str(sys.argv[1])
        bucketName = str(sys.argv[2])
        keyName = str (sys.argv[3])
else:
        print ("USE: python s3DeleteKey.py <Access Key> <Bucket Name> <Key Name>")
        sys.exit(-1)

# ----------------------- CONNECTION  ------------------------------------------------
S3Connection (accessKey)

# -----------------------  KEY CREATION -------------------------------------------

deleteKey (bucketName, keyName)

# -------------- END PROCESS --------------------------------------------------------------------
print ("Key %s deleted from bucket %s successfully" % (keyName, bucketName))
sys.exit(0)