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Code Block
languagejava
firstline144
titleclients/src/main/java/org/apache/kafka/server/authorizer/Authorizer.java
linenumberstrue
    /**
     * Check if the caller is authorized to perform the given ACL operation on at least one
     * resource of the given type.
     *
     * @param requestContext Request context including request resourceType, security protocol, and listener name
     * @param op             The ACL operation to check
     * @param resourceType   The resource type
     * @return               Return {@link AuthorizationResult#ALLOWED} if the caller is authorized to perform the
     *                       given ACL operation on at least one resource of the given type. 
     *                       Return {@link AuthorizationResult#DENIED} otherwise.
     */
    default AuthorizationResult authorizeAnyauthorizeByResourceType(AuthorizableRequestContext requestContext, 
													    AclOperation op, 
														ResourceType resourceType) {
        if (resourceType == ResourceType.ANY) {
            throw new IllegalArgumentException(
                "Must specify a non-filter resource type for authorizeAnyauthorizeByResourceType");
        }

        if (resourceType == ResourceType.UNKNOWN) {
            throw new IllegalArgumentException(
                "Unknown resource type");
        }

        if (op == AclOperation.ANY) {
            throw new IllegalArgumentException(
                "Must specify a non-filter operation type for authorizeAnyauthorizeByResourceType");
        }

        if (op == AclOperation.UNKNOWN) {
            throw new IllegalArgumentException(
                "Unknown operation type");
        }

        ResourcePatternFilter resourceTypeFilter = new ResourcePatternFilter(
            resourceType, null, PatternType.ANY);
        AclBindingFilter aclFilter = new AclBindingFilter(
            resourceTypeFilter, AccessControlEntryFilter.ANY);

        Set<String> denyLiterals = new HashSet<>();
        Set<String> denyPrefixes = new HashSet<>();
        Set<String> allowLiterals = new HashSet<>();
        Set<String> allowPrefixes = new HashSet<>();
        boolean hasWildCardAllow = false;

        for (AclBinding binding : acls(aclFilter)) {
            if (!binding.entry().host().equals(requestContext.clientAddress().getHostAddress())
                    && !binding.entry().host().equals("*"))
                continue;

            if (!binding.entry().principal().equals(requestContext.principal().toString())
                    && !binding.entry().principal().equals("User:*"))
                continue;

            if (binding.entry().operation() != op
                    && binding.entry().operation() != AclOperation.ALL)
                continue;

            if (binding.entry().permissionType() == AclPermissionType.DENY) {
                switch (binding.pattern().patternType()) {
                    case LITERAL:
                        if (binding.pattern().name().equals(ResourcePattern.WILDCARD_RESOURCE))
                            return AuthorizationResult.DENIED;
                            denyLiterals.add(binding.pattern().name());
                        break;
                    case PREFIXED:
                        denyPrefixes.add(binding.pattern().name());
                        break;
                }
                continue;
            }

            if (binding.entry().permissionType() != AclPermissionType.ALLOW)
                continue;

            switch (binding.pattern().patternType()) {
                case LITERAL:
                    if (binding.pattern().name().equals(ResourcePattern.WILDCARD_RESOURCE)) {
                        hasWildCardAllow = true;
                        continue;
                    }
                    allowLiterals.add(binding.pattern().name());
                    break;
                case PREFIXED:
                    allowPrefixes.add(binding.pattern().name());
                    break;
            }
        }

        if (hasWildCardAllow) {
            return AuthorizationResult.ALLOWED;
        }

        for (String allowPrefix : allowPrefixes) {
            StringBuilder sb = new StringBuilder();
            boolean hasDominatedDeny = false;
            for (char ch : allowPrefix.toCharArray()) {
                sb.append(ch);
                if (denyPrefixes.contains(sb.toString())) {
                    hasDominatedDeny = true;
                    break;
                }
            }
            if (!hasDominatedDeny)
                return AuthorizationResult.ALLOWED;
        }

        for (String allowLiteral : allowLiterals) {
            if (denyLiterals.contains(allowLiteral))
                continue;
            StringBuilder sb = new StringBuilder();
            boolean hasDominatedDeny = false;
            for (char ch : allowLiteral.toCharArray()) {
                sb.append(ch);
                if (denyPrefixes.contains(sb.toString())) {
                    hasDominatedDeny = true;
                    break;
                }
            }
            if (!hasDominatedDeny)
                return AuthorizationResult.ALLOWED;
        }

        return AuthorizationResult.DENIED;
    }

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