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How to use get_kms_backend method in localstack

Best Python code snippet using localstack_python
provider.py
Source:provider.py
...118    def __init__(self, message=None):119        super().__init__("ValidationError", message=message)120class KmsProvider(KmsApi):121    @staticmethod122    def get_kms_backend(context: RequestContext) -> BaseBackend:123        return kms_backends[context.account_id][context.region]124    @handler("CreateKey", expand=False)125    def create_key(126        self,127        context: RequestContext,128        create_key_request: CreateKeyRequest = None,129    ) -> CreateKeyResponse:130        result = call_moto(context)131        # generate keypair for signing, if this is a SIGN_VERIFY key132        key_usage = create_key_request.get("KeyUsage", "ENCRYPT_DECRYPT")133        key_spec = create_key_request.get("KeySpec", "SYMMETRIC_DEFAULT")134        if not (key_usage == "ENCRYPT_DECRYPT" and key_spec == "SYMMETRIC_DEFAULT"):135            create_key_request["KeyId"] = result["KeyMetadata"]["KeyId"]136            _generate_data_key_pair(create_key_request, create_cipher=False)137        return result138    @handler("CreateGrant", expand=False)139    def create_grant(140        self, context: RequestContext, create_grant_request: CreateGrantRequest141    ) -> CreateGrantResponse:142        self._validate_grant(create_grant_request)143        region_details = KMSBackend.get()144        grant = dict(create_grant_request)145        grant[GRANT_ID] = long_uid()146        grant[GRANT_TOKENS] = [long_uid()]147        if NAME not in grant:148            grant[NAME] = ""149        grant[CREATION_DATE] = time.time()150        region_details.grants[grant[GRANT_ID]] = grant151        return CreateGrantResponse(GrantId=grant[GRANT_ID], GrantToken=grant[GRANT_TOKENS][0])152    @handler("ListGrants", expand=False)153    def list_grants(154        self, context: RequestContext, list_grants_request: ListGrantsRequest155    ) -> ListGrantsResponse:156        key_id = list_grants_request.get(KEY_ID)157        if not key_id:158            raise ValidationError(f"Required input parameter '{KEY_ID}' not specified")159        region_details = KMSBackend.get()160        self._verify_key_exists(key_id)161        limit = list_grants_request.get("Limit", 50)162        if "Marker" in list_grants_request:163            filtered = region_details.markers.get(list_grants_request["Marker"], [])164        else:165            filtered = [166                grant167                for grant in region_details.grants.values()168                if grant[KEY_ID] == key_id169                and filter_grant_id(grant, list_grants_request)170                and filter_grantee_principal(grant, list_grants_request)171            ]172        # filter out attributes173        filtered = [remove_attributes(dict(grant), ["GrantTokens"]) for grant in filtered]174        if len(filtered) <= limit:175            return ListGrantsResponse(Grants=filtered, Truncated=False)176        in_limit = filtered[:limit]177        out_limit = filtered[limit:]178        marker_id = long_uid()179        region_details.markers[marker_id] = out_limit180        return ListGrantsResponse(Grants=in_limit, Truncated=True, NextMarker=marker_id)181    def revoke_grant(182        self, context: RequestContext, key_id: KeyIdType, grant_id: GrantIdType183    ) -> None:184        grants = KMSBackend.get().grants185        if grants[grant_id][KEY_ID] != key_id:186            raise ValidationError(f"Invalid {KEY_ID}={key_id} specified for grant {grant_id}")187        grants.pop(grant_id)188    def retire_grant(189        self,190        context: RequestContext,191        grant_token: GrantTokenType = None,192        key_id: KeyIdType = None,193        grant_id: GrantIdType = None,194    ) -> None:195        region_details = KMSBackend.get()196        grants = region_details.grants197        if grant_id and grants[grant_id][KEY_ID] == key_id:198            grants.pop(grant_id)199        elif grant_token:200            region_details.grants = {201                grant_id: grant202                for grant_id, grant in grants.items()203                if grant_token not in grant[GRANT_TOKENS]204            }205        else:206            raise InvalidGrantTokenException("Grant token OR (grant ID, key ID) must be specified")207    def list_retirable_grants(208        self,209        context: RequestContext,210        retiring_principal: PrincipalIdType,211        limit: LimitType = None,212        marker: MarkerType = None,213    ) -> ListGrantsResponse:214        region_details = KMSBackend.get()215        grants = region_details.grants216        if not retiring_principal:217            raise ValidationError(f"Required input parameter '{RETIRING_PRINCIPAL}' not specified")218        limit = limit or 50219        if marker:220            markers = region_details.markers221            filtered = markers.get(marker, [])222        else:223            filtered = [224                grant225                for grant in grants.values()226                if RETIRING_PRINCIPAL in grant and grant[RETIRING_PRINCIPAL] == retiring_principal227            ]228        if len(filtered) <= limit:229            return ListGrantsResponse(Grants=filtered, Truncated=False)230        markers = region_details.markers231        in_limit = filtered[:limit]232        out_limit = filtered[limit:]233        marker_id = long_uid()234        markers[marker_id] = out_limit235        return ListGrantsResponse(Grants=in_limit, Truncated=True, NextMarker=marker_id)236    @handler("GetPublicKey")237    def get_public_key(238        self, context: RequestContext, key_id: KeyIdType, grant_tokens: GrantTokenList = None239    ) -> GetPublicKeyResponse:240        region_details = KMSBackend.get()241        result = region_details.key_pairs.get(key_id)242        if not result:243            raise NotFoundException()244        attrs = [245            "KeyId",246            "PublicKey",247            "KeySpec",248            "KeyUsage",249            "EncryptionAlgorithms",250            "SigningAlgorithms",251        ]252        result = select_attributes(result, attrs)253        return GetPublicKeyResponse(**result)254    @handler("GenerateDataKeyPair", expand=False)255    def generate_data_key_pair(256        self,257        context: RequestContext,258        generate_data_key_pair_request: GenerateDataKeyPairRequest,259    ) -> GenerateDataKeyPairResponse:260        result = _generate_data_key_pair(generate_data_key_pair_request)261        attrs = [262            "PrivateKeyCiphertextBlob",263            "PrivateKeyPlaintext",264            "PublicKey",265            "KeyId",266            "KeyPairSpec",267        ]268        result = select_attributes(result, attrs)269        return GenerateDataKeyPairResponse(**result)270    @handler("GenerateDataKeyPairWithoutPlaintext", expand=False)271    def generate_data_key_pair_without_plaintext(272        self,273        context: RequestContext,274        generate_data_key_pair_without_plaintext_request: GenerateDataKeyPairWithoutPlaintextRequest,275    ) -> GenerateDataKeyPairWithoutPlaintextResponse:276        result = _generate_data_key_pair(generate_data_key_pair_without_plaintext_request)277        result = select_attributes(278            result, ["PrivateKeyCiphertextBlob", "PublicKey", "KeyId", "KeyPairSpec"]279        )280        return GenerateDataKeyPairResponse(**result)281    def sign(282        self,283        context: RequestContext,284        key_id: KeyIdType,285        message: PlaintextType,286        signing_algorithm: SigningAlgorithmSpec,287        message_type: MessageType = None,288        grant_tokens: GrantTokenList = None,289    ) -> SignResponse:290        region_details = KMSBackend.get()291        key_pair = region_details.key_pairs.get(key_id)292        if not key_pair:293            raise NotFoundException(f"Key ID {key_id} not found for signing")294        kwargs = {}295        if signing_algorithm.startswith("RSA"):296            if "PKCS" in signing_algorithm:297                kwargs["padding"] = padding.PKCS1v15()298            elif "PSS" in signing_algorithm:299                kwargs["padding"] = padding.PSS(300                    mgf=padding.MGF1(hashes.SHA256()), salt_length=padding.PSS.MAX_LENGTH301                )302            else:303                LOG.warning("Unsupported padding in SigningAlgorithm '%s'", signing_algorithm)304        if "SHA_256" in signing_algorithm:305            kwargs["algorithm"] = hashes.SHA256()306        elif "SHA_384" in signing_algorithm:307            kwargs["algorithm"] = hashes.SHA384()308        elif "SHA_512" in signing_algorithm:309            kwargs["algorithm"] = hashes.SHA512()310        else:311            LOG.warning("Unsupported hash type in SigningAlgorithm '%s'", signing_algorithm)312        if signing_algorithm.startswith("ECDSA"):313            kwargs["signature_algorithm"] = ec.ECDSA(algorithm=kwargs.pop("algorithm", None))314        # generate signature315        signature = key_pair["_key_"].sign(data=message, **kwargs)316        result = {317            "KeyId": key_id,318            "Signature": signature,319            "SigningAlgorithm": signing_algorithm,320        }321        return SignResponse(**result)322    def encrypt(323        self,324        context: RequestContext,325        key_id: KeyIdType,326        plaintext: PlaintextType,327        encryption_context: EncryptionContextType = None,328        grant_tokens: GrantTokenList = None,329        encryption_algorithm: EncryptionAlgorithmSpec = None,330    ) -> EncryptResponse:331        # check if we have imported custom key material for this key332        matching = [key for key in KMSBackend.get().imports.values() if key.key_id == key_id]333        if not matching:334            return call_moto(context)335        key_obj = self.get_kms_backend(context).keys.get(key_id)336        ciphertext_blob = encrypt(key_obj.key_material, plaintext)337        return EncryptResponse(338            CiphertextBlob=ciphertext_blob, KeyId=key_id, EncryptionAlgorithm=encryption_algorithm339        )340    def decrypt(341        self,342        context: RequestContext,343        ciphertext_blob: CiphertextType,344        encryption_context: EncryptionContextType = None,345        grant_tokens: GrantTokenList = None,346        key_id: KeyIdType = None,347        encryption_algorithm: EncryptionAlgorithmSpec = None,348    ) -> DecryptResponse:349        # check if we have imported custom key material for this key350        matching = [key for key in KMSBackend.get().imports.values() if key.key_id == key_id]351        if not matching:352            return call_moto(context)353        key_obj = self.get_kms_backend(context).keys.get(key_id)354        plaintext = decrypt(key_obj.key_material, ciphertext_blob)355        return DecryptResponse(356            KeyId=key_id, Plaintext=plaintext, EncryptionAlgorithm=encryption_algorithm357        )358    def get_parameters_for_import(359        self,360        context: RequestContext,361        key_id: KeyIdType,362        wrapping_algorithm: AlgorithmSpec,363        wrapping_key_spec: WrappingKeySpec,364    ) -> GetParametersForImportResponse:365        key = _generate_data_key_pair(366            {"KeySpec": wrapping_key_spec}, create_cipher=False, add_to_keys=False367        )368        import_token = short_uid()369        import_state = KeyImportState(370            key_id=key_id,371            import_token=import_token,372            private_key=key["PrivateKeyPlaintext"],373            public_key=key["PublicKey"],374            wrapping_algo=wrapping_algorithm,375            key_obj=key["_key_"],376        )377        KMSBackend.get().imports[import_token] = import_state378        expiry_date = datetime.datetime.now() + datetime.timedelta(days=100)379        return GetParametersForImportResponse(380            KeyId=key_id,381            ImportToken=to_bytes(import_state.import_token),382            PublicKey=import_state.public_key,383            ParametersValidTo=expiry_date,384        )385    def import_key_material(386        self,387        context: RequestContext,388        key_id: KeyIdType,389        import_token: CiphertextType,390        encrypted_key_material: CiphertextType,391        valid_to: DateType = None,392        expiration_model: ExpirationModelType = None,393    ) -> ImportKeyMaterialResponse:394        import_token = to_str(import_token)395        import_state = KMSBackend.get().imports.get(import_token)396        if not import_state:397            raise NotFoundException(f"Unable to find key import token '{import_token}'")398        key_obj = self.get_kms_backend(context).keys.get(key_id)399        if not key_obj:400            raise NotFoundException(f"Unable to find key '{key_id}'")401        if import_state.wrapping_algo == AlgorithmSpec.RSAES_PKCS1_V1_5:402            decrypt_padding = padding.PKCS1v15()403        elif import_state.wrapping_algo == AlgorithmSpec.RSAES_OAEP_SHA_1:404            decrypt_padding = padding.OAEP(padding.MGF1(hashes.SHA1()), hashes.SHA1(), None)405        elif import_state.wrapping_algo == AlgorithmSpec.RSAES_OAEP_SHA_256:406            decrypt_padding = padding.OAEP(padding.MGF1(hashes.SHA256()), hashes.SHA256(), None)407        else:408            raise KMSInvalidStateException(409                f"Unsupported padding, requested wrapping algorithm:'{import_state.wrapping_algo}'"410            )411        key_material = import_state.key_obj.decrypt(encrypted_key_material, decrypt_padding)412        key_obj.key_material = key_material413        return ImportKeyMaterialResponse()414    def list_aliases(415        self,416        context: RequestContext,417        key_id: KeyIdType = None,418        limit: LimitType = None,419        marker: MarkerType = None,420    ) -> ListAliasesResponse:421        if key_id is None:422            return call_moto(context)423        response_aliases = PaginatedList()424        backend = self.get_kms_backend(context)425        if backend.keys.get(key_id) is None:426            raise NotFoundException(f"Unable to find key '{key_id}'")427        aliases_of_key = backend.get_all_aliases().get(key_id) or []428        for alias_name in aliases_of_key:429            response_aliases.append(430                AliasListEntry(431                    AliasArn=kms_alias_arn(alias_name, region_name=context.region),432                    AliasName=alias_name,433                    TargetKeyId=key_id,434                )435            )436        page, nxt = response_aliases.get_page(437            lambda a: a["AliasName"], next_token=marker, page_size=limit438        )...
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