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feat: add thing attribute variable support
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74 changes: 74 additions & 0 deletions
74
src/main/java/com/aws/greengrass/clientdevices/auth/configuration/PolicyVariable.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
|
||
| package com.aws.greengrass.clientdevices.auth.configuration; | ||
|
|
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| import com.aws.greengrass.clientdevices.auth.session.attribute.Attribute; | ||
| import lombok.Builder; | ||
| import lombok.NonNull; | ||
| import lombok.Value; | ||
| import org.apache.commons.lang3.StringUtils; | ||
|
|
||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
|
|
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| @Builder | ||
| @Value | ||
| public class PolicyVariable { | ||
|
|
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| private static final String THING_NAME_PATTERN = "${iot:Connection.Thing.ThingName}"; | ||
| private static final String THING_NAMESPACE = "Thing"; | ||
|
|
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| private static final String THING_ATTRS_PREFIX = "${iot:Connection.Thing.Attributes["; | ||
| private static final String THING_ATTRS_SUFFIX = "]}"; | ||
|
|
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| String originalText; | ||
| boolean isThingAttribute; | ||
| Attribute attribute; | ||
| String selector; // the part within [ ] | ||
|
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| /** | ||
| * Parse a policy variable from string. | ||
| * | ||
| * @param policyVariable variable | ||
| * @return parsed policy variable | ||
| */ | ||
| public static Optional<PolicyVariable> parse(@NonNull String policyVariable) { | ||
| // thing name | ||
| if (Objects.equals(policyVariable, THING_NAME_PATTERN)) { | ||
| return Optional.of(PolicyVariable.builder() | ||
| .originalText(policyVariable) | ||
| .attribute(Attribute.THING_NAME) | ||
| .build()); | ||
| } | ||
|
|
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| // thing attributes | ||
| if (policyVariable.startsWith(THING_ATTRS_PREFIX) && policyVariable.endsWith(THING_ATTRS_SUFFIX)) { | ||
| return parseAttributePolicyVariable(policyVariable); | ||
| } | ||
|
|
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| // unsupported variable | ||
| return Optional.empty(); | ||
| } | ||
|
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| private static Optional<PolicyVariable> parseAttributePolicyVariable(@NonNull String policyVariable) { | ||
| int attrStart = THING_ATTRS_PREFIX.length(); | ||
| int attrEnd = policyVariable.length() - THING_ATTRS_SUFFIX.length(); | ||
| if (attrStart > attrEnd) { | ||
| return Optional.empty(); | ||
| } | ||
|
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| String attr = policyVariable.substring(attrStart, attrEnd); | ||
| if (!StringUtils.isAlphanumeric(attr)) { | ||
| return Optional.empty(); | ||
| } | ||
|
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| return Optional.of(PolicyVariable.builder() | ||
| .originalText(policyVariable) | ||
| .attribute(Attribute.THING_ATTRIBUTES) | ||
| .selector(attr) | ||
| .build()); | ||
| } | ||
| } |
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