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"""
Manage S3 Buckets
=================

.. versionadded:: 2016.3.0

Create and destroy S3 buckets. Be aware that this interacts with Amazon's services,
and so may incur charges.

:depends:
    - boto
    - boto3

The dependencies listed above can be installed via package or pip.

This module accepts explicit vpc credentials but can also utilize
IAM roles assigned to the instance through Instance Profiles. Dynamic
credentials are then automatically obtained from AWS API and no further
configuration is necessary. More information available `here
<http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html>`_.

If IAM roles are not used you need to specify them either in a pillar file or
in the minion's config file:

.. code-block:: yaml

    vpc.keyid: GKTADJGHEIQSXMKKRBJ08H
    vpc.key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs

It's also possible to specify ``key``, ``keyid`` and ``region`` via a profile,
either passed in as a dict, or as a string to pull from pillars or minion
config:

.. code-block:: yaml

    myprofile:
        keyid: GKTADJGHEIQSXMKKRBJ08H
        key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
        region: us-east-1

.. code-block:: text

    Ensure bucket exists:
        boto_s3_bucket.present:
            - Bucket: mybucket
            - LocationConstraint: EU
            - ACL:
              - GrantRead: "uri=http://acs.amazonaws.com/groups/global/AllUsers"
            - CORSRules:
              - AllowedHeaders: []
                AllowedMethods: ["GET"]
                AllowedOrigins: ["*"]
                ExposeHeaders: []
                MaxAgeSeconds: 123
            - LifecycleConfiguration:
              - Expiration:
                  Days: 123
                ID: "idstring"
                Prefix: "prefixstring"
                Status: "enabled",
                ID: "lc1"
                Transitions:
                  - Days: 123
                    StorageClass: "GLACIER"
                NoncurrentVersionTransitions:
                  - NoncurrentDays: 123
                    StorageClass: "GLACIER"
                NoncurrentVersionExpiration:
                  NoncurrentDays: 123
            - Logging:
                TargetBucket: log_bucket
                TargetPrefix: prefix
                TargetGrants:
                  - Grantee:
                      DisplayName: "string"
                      EmailAddress: "string"
                      ID: "string"
                      Type: "AmazonCustomerByEmail"
                      URI: "string"
                    Permission: "READ"
            - NotificationConfiguration:
                LambdaFunctionConfiguration:
                  - Id: "string"
                    LambdaFunctionArn: "string"
                    Events:
                      - "s3:ObjectCreated:*"
                    Filter:
                      Key:
                        FilterRules:
                          - Name: "prefix"
                            Value: "string"
            - Policy:
                Version: "2012-10-17"
                Statement:
                  - Sid: "String"
                    Effect: "Allow"
                    Principal:
                      AWS: "arn:aws:iam::133434421342:root"
                    Action: "s3:PutObject"
                    Resource: "arn:aws:s3:::my-bucket/*"
            - Replication:
                Role: myrole
                Rules:
                  - ID: "string"
                    Prefix: "string"
                    Status: "Enabled"
                    Destination:
                      Bucket: "arn:aws:s3:::my-bucket"
            - RequestPayment:
                Payer: Requester
            - Tagging:
                tag_name: tag_value
                tag_name_2: tag_value
            - Versioning:
                Status: "Enabled"
            - Website:
                ErrorDocument:
                  Key: "error.html"
                IndexDocument:
                  Suffix: "index.html"
                RedirectAllRequestsTo:
                  Hostname: "string"
                  Protocol: "http"
                RoutingRules:
                  - Condition:
                      HttpErrorCodeReturnedEquals: "string"
                      KeyPrefixEquals: "string"
                    Redirect:
                      HostName: "string"
                      HttpRedirectCode: "string"
                      Protocol: "http"
                      ReplaceKeyPrefixWith: "string"
                      ReplaceKeyWith: "string"
            - region: us-east-1
            - keyid: GKTADJGHEIQSXMKKRBJ08H
            - key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs

"""

import copy
import logging

import salt.utils.json

log = logging.getLogger(__name__)


def __virtual__():
    """
    Only load if boto is available.
    """
    if "boto_s3_bucket.exists" in __salt__:
        return "boto_s3_bucket"
    return (False, "boto_s3_bucket module could not be loaded")


def _normalize_user(user_dict):
    ret = copy.deepcopy(user_dict)
    # 'Type' is required as input to the AWS API, but not returned as output. So
    # we ignore it everywhere.
    if "Type" in ret:
        del ret["Type"]
    return ret


def _get_canonical_id(region, key, keyid, profile):
    ret = __salt__["boto_s3_bucket.list"](
        region=region, key=key, keyid=keyid, profile=profile
    ).get("Owner")
    return _normalize_user(ret)


def _prep_acl_for_compare(ACL):
    """
    Prepares the ACL returned from the AWS API for comparison with a given one.
    """
    ret = copy.deepcopy(ACL)
    ret["Owner"] = _normalize_user(ret["Owner"])
    for item in ret.get("Grants", ()):
        item["Grantee"] = _normalize_user(item.get("Grantee"))
    return ret


def _acl_to_grant(ACL, owner_canonical_id):
    if "AccessControlPolicy" in ACL:
        ret = copy.deepcopy(ACL["AccessControlPolicy"])
        ret["Owner"] = _normalize_user(ret["Owner"])
        for item in ACL.get("Grants", ()):
            item["Grantee"] = _normalize_user(item.get("Grantee"))
        # If AccessControlPolicy is set, other options are not allowed
        return ret
    owner_canonical_grant = copy.deepcopy(owner_canonical_id)
    owner_canonical_grant.update({"Type": "CanonicalUser"})
    ret = {"Grants": [], "Owner": owner_canonical_id}
    if "ACL" in ACL:
        # This is syntactic sugar; expand it out
        acl = ACL["ACL"]
        if acl in ("public-read", "public-read-write"):
            ret["Grants"].append(
                {
                    "Grantee": {
                        "Type": "Group",
                        "URI": "http://acs.amazonaws.com/groups/global/AllUsers",
                    },
                    "Permission": "READ",
                }
            )
        if acl == "public-read-write":
            ret["Grants"].append(
                {
                    "Grantee": {
                        "Type": "Group",
                        "URI": "http://acs.amazonaws.com/groups/global/AllUsers",
                    },
                    "Permission": "WRITE",
                }
            )
        if acl == "aws-exec-read":
            ret["Grants"].append(
                {
                    "Grantee": {
                        "Type": "CanonicalUser",
                        "DisplayName": "za-team",
                        "ID": "6aa5a366c34c1cbe25dc49211496e913e0351eb0e8c37aa3477e40942ec6b97c",
                    },
                    "Permission": "READ",
                }
            )
        if acl == "authenticated-read":
            ret["Grants"].append(
                {
                    "Grantee": {
                        "Type": "Group",
                        "URI": (
                            "http://acs.amazonaws.com/groups/global/AuthenticatedUsers"
                        ),
                    },
                    "Permission": "READ",
                }
            )
        if acl == "log-delivery-write":
            for permission in ("WRITE", "READ_ACP"):
                ret["Grants"].append(
                    {
                        "Grantee": {
                            "Type": "Group",
                            "URI": "http://acs.amazonaws.com/groups/s3/LogDelivery",
                        },
                        "Permission": permission,
                    }
                )
    for key, permission in (
        ("GrantFullControl", "FULL_CONTROL"),
        ("GrantRead", "READ"),
        ("GrantReadACP", "READ_ACP"),
        ("GrantWrite", "WRITE"),
        ("GrantWriteACP", "WRITE_ACP"),
    ):
        if key in ACL:
            for item in ACL[key].split(","):
                kind, val = item.split("=")
                if kind == "uri":
                    grantee = {"Type": "Group", "URI": val}
                elif kind == "id":
                    grantee = {
                        # No API provides this info, so the result will never
                        # match, and we will always update. Result is still
                        # idempotent
                        # 'DisplayName': ???,
                        "Type": "CanonicalUser",
                        "ID": val,
                    }
                else:
                    grantee = {
                        # No API provides this info, so the result will never
                        # match, and we will always update. Result is still
                        # idempotent
                        # 'DisplayName': ???,
                        # 'ID': ???
                    }
                ret["Grants"].append({"Grantee": grantee, "Permission": permission})
    # Boto only seems to list the default Grants when no other Grants are defined
    if not ret["Grants"]:
        ret["Grants"] = [
            {"Grantee": owner_canonical_grant, "Permission": "FULL_CONTROL"}
        ]
    return ret


def _get_role_arn(name, region=None, key=None, keyid=None, profile=None):
    if name.startswith("arn:aws:iam:"):
        return name

    account_id = __salt__["boto_iam.get_account_id"](
        region=region, key=key, keyid=keyid, profile=profile
    )
    if profile and "region" in profile:
        region = profile["region"]
    if region is None:
        region = "us-east-1"
    return f"arn:aws:iam::{account_id}:role/{name}"


def _compare_json(current, desired, region, key, keyid, profile):
    return __utils__["boto3.json_objs_equal"](current, desired)


def _compare_acl(current, desired, region, key, keyid, profile):
    """
    ACLs can be specified using macro-style names that get expanded to
    something more complex. There's no predictable way to reverse it.
    So expand all syntactic sugar in our input, and compare against that
    rather than the input itself.
    """
    ocid = _get_canonical_id(region, key, keyid, profile)
    return __utils__["boto3.json_objs_equal"](current, _acl_to_grant(desired, ocid))


def _compare_policy(current, desired, region, key, keyid, profile):
    return current == desired


def _compare_replication(current, desired, region, key, keyid, profile):
    """
    Replication accepts a non-ARN role name, but always returns an ARN
    """
    if desired is not None and desired.get("Role"):
        desired = copy.deepcopy(desired)
        desired["Role"] = _get_role_arn(
            desired["Role"], region=region, key=key, keyid=keyid, profile=profile
        )
    return __utils__["boto3.json_objs_equal"](current, desired)


def present(
    name,
    Bucket,
    LocationConstraint=None,
    ACL=None,
    CORSRules=None,
    LifecycleConfiguration=None,
    Logging=None,
    NotificationConfiguration=None,
    Policy=None,
    Replication=None,
    RequestPayment=None,
    Tagging=None,
    Versioning=None,
    Website=None,
    region=None,
    key=None,
    keyid=None,
    profile=None,
):
    """
    Ensure bucket exists.

    name
        The name of the state definition

    Bucket
        Name of the bucket.

    LocationConstraint
        'EU'|'eu-west-1'|'us-west-1'|'us-west-2'|'ap-southeast-1'|'ap-southeast-2'|'ap-northeast-1'|'sa-east-1'|'cn-north-1'|'eu-central-1'

    ACL
        The permissions on a bucket using access control lists (ACL).

    CORSRules
        The cors configuration for a bucket.

    LifecycleConfiguration
        Lifecycle configuration for your bucket

    Logging
        The logging parameters for a bucket and to specify permissions for who
        can view and modify the logging parameters.

    NotificationConfiguration
        notifications of specified events for a bucket

    Policy
        Policy on the bucket

    Replication
        Replication rules. You can add as many as 1,000 rules.
        Total replication configuration size can be up to 2 MB

    RequestPayment
        The request payment configuration for a bucket. By default, the bucket
        owner pays for downloads from the bucket. This configuration parameter
        enables the bucket owner (only) to specify that the person requesting
        the download will be charged for the download

    Tagging
        A dictionary of tags that should be set on the bucket

    Versioning
        The versioning state of the bucket

    Website
        The website configuration of the bucket

    region
        Region to connect to.

    key
        Secret key to be used.

    keyid
        Access key to be used.

    profile
        A dict with region, key and keyid, or a pillar key (string) that
        contains a dict with region, key and keyid.
    """
    ret = {"name": Bucket, "result": True, "comment": "", "changes": {}}

    if ACL is None:
        ACL = {"ACL": "private"}
    if NotificationConfiguration is None:
        NotificationConfiguration = {}
    if RequestPayment is None:
        RequestPayment = {"Payer": "BucketOwner"}
    if Policy:
        if isinstance(Policy, str):
            Policy = salt.utils.json.loads(Policy)
        Policy = __utils__["boto3.ordered"](Policy)

    r = __salt__["boto_s3_bucket.exists"](
        Bucket=Bucket, region=region, key=key, keyid=keyid, profile=profile
    )

    if "error" in r:
        ret["result"] = False
        ret["comment"] = "Failed to create bucket: {}.".format(r["error"]["message"])
        return ret

    if not r.get("exists"):
        if __opts__["test"]:
            ret["comment"] = f"S3 bucket {Bucket} is set to be created."
            ret["result"] = None
            return ret
        r = __salt__["boto_s3_bucket.create"](
            Bucket=Bucket,
            LocationConstraint=LocationConstraint,
            region=region,
            key=key,
            keyid=keyid,
            profile=profile,
        )
        if not r.get("created"):
            ret["result"] = False
            ret["comment"] = "Failed to create bucket: {}.".format(
                r["error"]["message"]
            )
            return ret

        for setter, testval, funcargs in (
            ("put_acl", ACL, ACL),
            ("put_cors", CORSRules, {"CORSRules": CORSRules}),
            (
                "put_lifecycle_configuration",
                LifecycleConfiguration,
                {"Rules": LifecycleConfiguration},
            ),
            ("put_logging", Logging, Logging),
            (
                "put_notification_configuration",
                NotificationConfiguration,
                NotificationConfiguration,
            ),
            ("put_policy", Policy, {"Policy": Policy}),
            # versioning must be set before replication
            ("put_versioning", Versioning, Versioning),
            ("put_replication", Replication, Replication),
            ("put_request_payment", RequestPayment, RequestPayment),
            ("put_tagging", Tagging, Tagging),
            ("put_website", Website, Website),
        ):
            if testval is not None:
                r = __salt__[f"boto_s3_bucket.{setter}"](
                    Bucket=Bucket,
                    region=region,
                    key=key,
                    keyid=keyid,
                    profile=profile,
                    **funcargs,
                )
                if not r.get("updated"):
                    ret["result"] = False
                    ret["comment"] = "Failed to create bucket: {}.".format(
                        r["error"]["message"]
                    )
                    return ret

        _describe = __salt__["boto_s3_bucket.describe"](
            Bucket, region=region, key=key, keyid=keyid, profile=profile
        )
        ret["changes"]["old"] = {"bucket": None}
        ret["changes"]["new"] = _describe
        ret["comment"] = f"S3 bucket {Bucket} created."

        return ret

    # bucket exists, ensure config matches
    ret["comment"] = " ".join([ret["comment"], f"S3 bucket {Bucket} is present."])
    ret["changes"] = {}
    _describe = __salt__["boto_s3_bucket.describe"](
        Bucket=Bucket, region=region, key=key, keyid=keyid, profile=profile
    )
    if "error" in _describe:
        ret["result"] = False
        ret["comment"] = "Failed to update bucket: {}.".format(
            _describe["error"]["message"]
        )
        ret["changes"] = {}
        return ret
    _describe = _describe["bucket"]

    # Once versioning has been enabled, it can't completely go away, it can
    # only be suspended
    if not bool(Versioning) and bool(_describe.get("Versioning")):
        Versioning = {"Status": "Suspended"}

    config_items = [
        ("ACL", "put_acl", _describe.get("ACL"), _compare_acl, ACL, None),
        (
            "CORS",
            "put_cors",
            _describe.get("CORS"),
            _compare_json,
            {"CORSRules": CORSRules} if CORSRules else None,
            "delete_cors",
        ),
        (
            "LifecycleConfiguration",
            "put_lifecycle_configuration",
            _describe.get("LifecycleConfiguration"),
            _compare_json,
            {"Rules": LifecycleConfiguration} if LifecycleConfiguration else None,
            "delete_lifecycle_configuration",
        ),
        (
            "Logging",
            "put_logging",
            _describe.get("Logging", {}).get("LoggingEnabled"),
            _compare_json,
            Logging,
            None,
        ),
        (
            "NotificationConfiguration",
            "put_notification_configuration",
            _describe.get("NotificationConfiguration"),
            _compare_json,
            NotificationConfiguration,
            None,
        ),
        (
            "Policy",
            "put_policy",
            _describe.get("Policy"),
            _compare_policy,
            {"Policy": Policy} if Policy else None,
            "delete_policy",
        ),
        (
            "RequestPayment",
            "put_request_payment",
            _describe.get("RequestPayment"),
            _compare_json,
            RequestPayment,
            None,
        ),
        (
            "Tagging",
            "put_tagging",
            _describe.get("Tagging"),
            _compare_json,
            Tagging,
            "delete_tagging",
        ),
        (
            "Website",
            "put_website",
            _describe.get("Website"),
            _compare_json,
            Website,
            "delete_website",
        ),
    ]
    versioning_item = (
        "Versioning",
        "put_versioning",
        _describe.get("Versioning"),
        _compare_json,
        Versioning or {},
        None,
    )
    # Substitute full ARN into desired state for comparison
    replication_item = (
        "Replication",
        "put_replication",
        _describe.get("Replication", {}).get("ReplicationConfiguration"),
        _compare_replication,
        Replication,
        "delete_replication",
    )

    # versioning must be turned on before replication can be on, thus replication
    # must be turned off before versioning can be off
    if Replication is not None:
        # replication will be on, must deal with versioning first
        config_items.append(versioning_item)
        config_items.append(replication_item)
    else:
        # replication will be off, deal with it first
        config_items.append(replication_item)
        config_items.append(versioning_item)

    update = False
    for varname, setter, current, comparator, desired, deleter in config_items:
        if varname == "Policy":
            if current is not None:
                temp = current.get("Policy")
                # Policy description is always returned as a JSON string.
                # Convert it to JSON now for ease of comparisons later.
                if isinstance(temp, str):
                    current = __utils__["boto3.ordered"](
                        {"Policy": salt.utils.json.loads(temp)}
                    )
        if not comparator(current, desired, region, key, keyid, profile):
            update = True
            if varname == "ACL":
                ret["changes"].setdefault("new", {})[varname] = _acl_to_grant(
                    desired, _get_canonical_id(region, key, keyid, profile)
                )
            else:
                ret["changes"].setdefault("new", {})[varname] = desired
            ret["changes"].setdefault("old", {})[varname] = current

            if not __opts__["test"]:
                if deleter and desired is None:
                    # Setting can be deleted, so use that to unset it
                    r = __salt__[f"boto_s3_bucket.{deleter}"](
                        Bucket=Bucket,
                        region=region,
                        key=key,
                        keyid=keyid,
                        profile=profile,
                    )
                    if not r.get("deleted"):
                        ret["result"] = False
                        ret["comment"] = "Failed to update bucket: {}.".format(
                            r["error"]["message"]
                        )
                        ret["changes"] = {}
                        return ret
                else:
                    r = __salt__[f"boto_s3_bucket.{setter}"](
                        Bucket=Bucket,
                        region=region,
                        key=key,
                        keyid=keyid,
                        profile=profile,
                        **(desired or {}),
                    )
                    if not r.get("updated"):
                        ret["result"] = False
                        ret["comment"] = "Failed to update bucket: {}.".format(
                            r["error"]["message"]
                        )
                        ret["changes"] = {}
                        return ret
    if update and __opts__["test"]:
        msg = f"S3 bucket {Bucket} set to be modified."
        ret["comment"] = msg
        ret["result"] = None
        return ret

    # Since location can't be changed, try that last so at least the rest of
    # the things are correct by the time we fail here. Fail so the user will
    # notice something mismatches their desired state.
    if _describe.get("Location", {}).get("LocationConstraint") != LocationConstraint:
        msg = (
            "Bucket {} location does not match desired configuration, but cannot be"
            " changed".format(LocationConstraint)
        )
        log.warning(msg)
        ret["result"] = False
        ret["comment"] = f"Failed to update bucket: {msg}."
        return ret

    return ret


def absent(name, Bucket, Force=False, region=None, key=None, keyid=None, profile=None):
    """
    Ensure bucket with passed properties is absent.

    name
        The name of the state definition.

    Bucket
        Name of the bucket.

    Force
        Empty the bucket first if necessary - Boolean.

    region
        Region to connect to.

    key
        Secret key to be used.

    keyid
        Access key to be used.

    profile
        A dict with region, key and keyid, or a pillar key (string) that
        contains a dict with region, key and keyid.
    """

    ret = {"name": Bucket, "result": True, "comment": "", "changes": {}}

    r = __salt__["boto_s3_bucket.exists"](
        Bucket, region=region, key=key, keyid=keyid, profile=profile
    )
    if "error" in r:
        ret["result"] = False
        ret["comment"] = "Failed to delete bucket: {}.".format(r["error"]["message"])
        return ret

    if r and not r["exists"]:
        ret["comment"] = f"S3 bucket {Bucket} does not exist."
        return ret

    if __opts__["test"]:
        ret["comment"] = f"S3 bucket {Bucket} is set to be removed."
        ret["result"] = None
        return ret
    r = __salt__["boto_s3_bucket.delete"](
        Bucket, Force=Force, region=region, key=key, keyid=keyid, profile=profile
    )
    if not r["deleted"]:
        ret["result"] = False
        ret["comment"] = "Failed to delete bucket: {}.".format(r["error"]["message"])
        return ret
    ret["changes"]["old"] = {"bucket": Bucket}
    ret["changes"]["new"] = {"bucket": None}
    ret["comment"] = f"S3 bucket {Bucket} deleted."
    return ret