# Copyright (c) 2006-2009 Mitch Garnaat http://garnaat.org/
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.

import uuid
from boto.cloudfront.identity import OriginAccessIdentity
from boto.cloudfront.object import Object, StreamingObject
from boto.cloudfront.signers import Signer, ActiveTrustedSigners, TrustedSigners
from boto.cloudfront.logging import LoggingInfo
from boto.s3.acl import ACL

class DistributionConfig:

    def __init__(self, connection=None, origin='', enabled=False,
                 caller_reference='', cnames=None, comment='',
                 origin_access_identity=None, trusted_signers=None):
        self.connection = connection
        self.origin = origin
        self.enabled = enabled
        if caller_reference:
            self.caller_reference = caller_reference
        else:
            self.caller_reference = str(uuid.uuid4())
        self.cnames = []
        if cnames:
            self.cnames = cnames
        self.comment = comment
        self.origin_access_identity = origin_access_identity
        self.trusted_signers = trusted_signers
        self.logging = None

    def get_oai_value(self):
        if isinstance(self.origin_access_identity, OriginAccessIdentity):
            return self.origin_access_identity.uri()
        else:
            return self.origin_access_identity
                
    def to_xml(self):
        s = '<?xml version="1.0" encoding="UTF-8"?>\n'
        s += '<DistributionConfig xmlns="http://cloudfront.amazonaws.com/doc/2008-12-01/">\n'
        s += '  <Origin>%s</Origin>\n' % self.origin
        s += '  <CallerReference>%s</CallerReference>\n' % self.caller_reference
        for cname in self.cnames:
            s += '  <CNAME>%s</CNAME>\n' % cname
        if self.comment:
            s += '  <Comment>%s</Comment>\n' % self.comment
        s += '  <Enabled>'
        if self.enabled:
            s += 'true'
        else:
            s += 'false'
        s += '</Enabled>\n'
        if self.origin_access_identity:
            val = self.get_oai_value()
            s += '<OriginAccessIdentifier>%s</OriginAccessIdentifier>\n' % val
        if self.trusted_signers:
            s += '<TrustedSigners>\n'
            for signer in self.trusted_signers:
                if signer == 'Self':
                    s += '  <Self></Self>\n'
                else:
                    s += '  <AwsAccountNumber>%s</AwsAccountNumber>\n' % signer
            s += '</TrustedSigners>\n'
        if self.logging:
            s += '<Logging>\n'
            s += '  <Bucket>%s</Bucket>\n' % self.logging.bucket
            s += '  <Prefix>%s</Prefix>\n' % self.logging.prefix
            s += '</Logging>\n'
        s += '</DistributionConfig>\n'
        return s

    def startElement(self, name, attrs, connection):
        if name == 'TrustedSigners':
            self.trusted_signers = TrustedSigners()
            return self.trusted_signers
        elif name == 'Logging':
            self.logging = LoggingInfo()
            return self.logging
        else:
            return None

    def endElement(self, name, value, connection):
        if name == 'CNAME':
            self.cnames.append(value)
        elif name == 'Origin':
            self.origin = value
        elif name == 'Comment':
            self.comment = value
        elif name == 'Enabled':
            if value.lower() == 'true':
                self.enabled = True
            else:
                self.enabled = False
        elif name == 'CallerReference':
            self.caller_reference = value
        elif name == 'OriginAccessIdentity':
            self.origin_access_identity = value
        else:
            setattr(self, name, value)

class StreamingDistributionConfig(DistributionConfig):

    def __init__(self, connection=None, origin='', enabled=False,
                 caller_reference='', cnames=None, comment=''):
        DistributionConfig.__init__(self, connection, origin,
                                    enabled, caller_reference,
                                    cnames, comment)

    def to_xml(self):
        s = '<?xml version="1.0" encoding="UTF-8"?>\n'
        s += '<StreamingDistributionConfig xmlns="http://cloudfront.amazonaws.com/doc/2009-12-01/">\n'
        s += '  <Origin>%s</Origin>\n' % self.origin
        s += '  <CallerReference>%s</CallerReference>\n' % self.caller_reference
        for cname in self.cnames:
            s += '  <CNAME>%s</CNAME>\n' % cname
        if self.comment:
            s += '  <Comment>%s</Comment>\n' % self.comment
        s += '  <Enabled>'
        if self.enabled:
            s += 'true'
        else:
            s += 'false'
        s += '</Enabled>\n'
        s += '</StreamingDistributionConfig>\n'
        return s

    def startElement(self, name, attrs, connection):
        pass

class DistributionSummary:

    def __init__(self, connection=None, domain_name='', id='',
                 last_modified_time=None, status='', origin='',
                 cname='', comment='', enabled=False):
        self.connection = connection
        self.domain_name = domain_name
        self.id = id
        self.last_modified_time = last_modified_time
        self.status = status
        self.origin = origin
        self.enabled = enabled
        self.cnames = []
        if cname:
            self.cnames.append(cname)
        self.comment = comment
        self.trusted_signers = None
        self.etag = None
        self.streaming = False

    def startElement(self, name, attrs, connection):
        if name == 'TrustedSigners':
            self.trusted_signers = TrustedSigners()
            return self.trusted_signers
        return None

    def endElement(self, name, value, connection):
        if name == 'Id':
            self.id = value
        elif name == 'Status':
            self.status = value
        elif name == 'LastModifiedTime':
            self.last_modified_time = value
        elif name == 'DomainName':
            self.domain_name = value
        elif name == 'Origin':
            self.origin = value
        elif name == 'CNAME':
            self.cnames.append(value)
        elif name == 'Comment':
            self.comment = value
        elif name == 'Enabled':
            if value.lower() == 'true':
                self.enabled = True
            else:
                self.enabled = False
        elif name == 'StreamingDistributionSummary':
            self.streaming = True
        else:
            setattr(self, name, value)

    def get_distribution(self):
        return self.connection.get_distribution_info(self.id)

class StreamingDistributionSummary(DistributionSummary):

    def get_distribution(self):
        return self.connection.get_streaming_distribution_info(self.id)
    
class Distribution:

    def __init__(self, connection=None, config=None, domain_name='',
                 id='', last_modified_time=None, status=''):
        self.connection = connection
        self.config = config
        self.domain_name = domain_name
        self.id = id
        self.last_modified_time = last_modified_time
        self.status = status
        self.active_signers = None
        self.etag = None
        self._bucket = None

    def startElement(self, name, attrs, connection):
        if name == 'DistributionConfig':
            self.config = DistributionConfig()
            return self.config
        elif name == 'ActiveTrustedSigners':
            self.active_signers = ActiveTrustedSigners()
            return self.active_signers
        else:
            return None

    def endElement(self, name, value, connection):
        if name == 'Id':
            self.id = value
        elif name == 'LastModifiedTime':
            self.last_modified_time = value
        elif name == 'Status':
            self.status = value
        elif name == 'DomainName':
            self.domain_name = value
        else:
            setattr(self, name, value)

    def update(self, enabled=None, cnames=None, comment=None,
               origin_access_identity=None,
               trusted_signers=None):
        """
        Update the configuration of the Distribution.

        :type enabled: bool
        :param enabled: Whether the Distribution is active or not.

        :type cnames: list of str
        :param cnames: The DNS CNAME's associated with this
                        Distribution.  Maximum of 10 values.

        :type comment: str or unicode
        :param comment: The comment associated with the Distribution.

        :type origin_access_identity: :class:`boto.cloudfront.identity.OriginAccessIdentity`
        :param origin_access_identity: The CloudFront origin access identity
                                       associated with the distribution.  This
                                       must be provided if you want the
                                       distribution to serve private content.

        :type trusted_signers: :class:`boto.cloudfront.signers.TrustedSigner`
        :param trusted_signers: The AWS users who are authorized to sign
                                URL's for private content in this Distribution.

        """
        new_config = DistributionConfig(self.connection, self.config.origin,
                                        self.config.enabled, self.config.caller_reference,
                                        self.config.cnames, self.config.comment,
                                        self.config.origin_access_identity,
                                        self.config.trusted_signers)
        if enabled != None:
            new_config.enabled = enabled
        if cnames != None:
            new_config.cnames = cnames
        if comment != None:
            new_config.comment = comment
        if origin_access_identity != None:
            new_config.origin_access_identity = origin_access_identity
        if trusted_signers:
            new_config.trusted_signers = trusted_signers
        self.etag = self.connection.set_distribution_config(self.id, self.etag, new_config)
        self.config = new_config
        self._object_class = Object

    def enable(self):
        """
        Deactivate the Distribution.  A convenience wrapper around
        the update method.
        """
        self.update(enabled=True)

    def disable(self):
        """
        Activate the Distribution.  A convenience wrapper around
        the update method.
        """
        self.update(enabled=False)

    def delete(self):
        """
        Delete this CloudFront Distribution.  The content
        associated with the Distribution is not deleted from
        the underlying Origin bucket in S3.
        """
        self.connection.delete_distribution(self.id, self.etag)

    def _get_bucket(self):
        if not self._bucket:
            bucket_name = self.config.origin.split('.')[0]
            from boto.s3.connection import S3Connection
            s3 = S3Connection(self.connection.aws_access_key_id,
                              self.connection.aws_secret_access_key,
                              proxy=self.connection.proxy,
                              proxy_port=self.connection.proxy_port,
                              proxy_user=self.connection.proxy_user,
                              proxy_pass=self.connection.proxy_pass)
            self._bucket = s3.get_bucket(bucket_name)
            self._bucket.distribution = self
            self._bucket.set_key_class(self._object_class)
        return self._bucket
    
    def get_objects(self):
        """
        Return a list of all content objects in this distribution.
        
        :rtype: list of :class:`boto.cloudfront.object.Object`
        :return: The content objects
        """
        bucket = self._get_bucket()
        objs = []
        for key in bucket:
            objs.append(key)
        return objs

    def set_permissions(self, object, replace=False):
        """
        Sets the S3 ACL grants for the given object to the appropriate
        value based on the type of Distribution.  If the Distribution
        is serving private content the ACL will be set to include the
        Origin Access Identity associated with the Distribution.  If
        the Distribution is serving public content the content will
        be set up with "public-read".

        :type object: :class:`boto.cloudfront.object.Object`
        :param enabled: The Object whose ACL is being set

        :type replace: bool
        :param replace: If False, the Origin Access Identity will be
                        appended to the existing ACL for the object.
                        If True, the ACL for the object will be
                        completely replaced with one that grants
                        READ permission to the Origin Access Identity.

        """
        if self.config.origin_access_identity:
            id = self.config.origin_access_identity.split('/')[-1]
            oai = self.connection.get_origin_access_identity_info(id)
            policy = object.get_acl()
            if replace:
                policy.acl = ACL()
            policy.acl.add_user_grant('READ', oai.s3_user_id)
            object.set_acl(policy)
        else:
            object.set_canned_acl('public-read')

    def set_permissions_all(self, replace=False):
        """
        Sets the S3 ACL grants for all objects in the Distribution
        to the appropriate value based on the type of Distribution.

        :type replace: bool
        :param replace: If False, the Origin Access Identity will be
                        appended to the existing ACL for the object.
                        If True, the ACL for the object will be
                        completely replaced with one that grants
                        READ permission to the Origin Access Identity.

        """
        bucket = self._get_bucket()
        for key in bucket:
            self.set_permissions(key)

    def add_object(self, name, content, headers=None, replace=True):
        """
        Adds a new content object to the Distribution.  The content
        for the object will be copied to a new Key in the S3 Bucket
        and the permissions will be set appropriately for the type
        of Distribution.

        :type name: str or unicode
        :param name: The name or key of the new object.

        :type content: file-like object
        :param content: A file-like object that contains the content
                        for the new object.

        :type headers: dict
        :param headers: A dictionary containing additional headers
                        you would like associated with the new
                        object in S3.

        :rtype: :class:`boto.cloudfront.object.Object`
        :return: The newly created object.
        """
        if self.config.origin_access_identity:
            policy = 'private'
        else:
            policy = 'public-read'
        bucket = self._get_bucket()
        object = bucket.new_key(name)
        object.set_contents_from_file(content, headers=headers, policy=policy)
        if self.config.origin_access_identity:
            self.set_permissions(object, replace)
        return object
            
class StreamingDistribution(Distribution):

    def __init__(self, connection=None, config=None, domain_name='',
                 id='', last_modified_time=None, status=''):
        Distribution.__init__(self, connection, config, domain_name,
                              id, last_modified_time, status)
        self._object_class = StreamingObject

    def startElement(self, name, attrs, connection):
        if name == 'StreamingDistributionConfig':
            self.config = StreamingDistributionConfig()
            return self.config
        else:
            return None

    def update(self, enabled=None, cnames=None, comment=None):
        """
        Update the configuration of the Distribution.

        :type enabled: bool
        :param enabled: Whether the Distribution is active or not.

        :type cnames: list of str
        :param cnames: The DNS CNAME's associated with this
                        Distribution.  Maximum of 10 values.

        :type comment: str or unicode
        :param comment: The comment associated with the Distribution.

        """
        new_config = StreamingDistributionConfig(self.connection,
                                                 self.config.origin,
                                                 self.config.enabled,
                                                 self.config.caller_reference,
                                                 self.config.cnames,
                                                 self.config.comment)
        if enabled != None:
            new_config.enabled = enabled
        if cnames != None:
            new_config.cnames = cnames
        if comment != None:
            new_config.comment = comment
            
        self.etag = self.connection.set_streaming_distribution_config(self.id,
                                                                      self.etag,
                                                                      new_config)
        self.config = new_config

    def delete(self):
        self.connection.delete_streaming_distribution(self.id, self.etag)
            
        
