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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,122 @@ | ||
| /* | ||
| * Copyright 2024 The gRPC Authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package io.grpc.internal; | ||
|
|
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| import static com.google.common.base.Preconditions.checkArgument; | ||
| import static com.google.common.base.Preconditions.checkNotNull; | ||
|
|
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| import com.google.common.base.Splitter; | ||
| import java.util.Locale; | ||
|
|
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| /** | ||
| * Helper utility to work with SPIFFE URIs. | ||
| * @see <a href="https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE-ID.md">Standard</a> | ||
| */ | ||
| public final class SpiffeUtil { | ||
|
|
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| private static final String PREFIX = "spiffe://"; | ||
|
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| private SpiffeUtil() {} | ||
|
|
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| /** | ||
| * Parses a URI string, applies validation rules described in SPIFFE standard, and, in case of | ||
| * success, returns parsed TrustDomain and Path. | ||
| * | ||
| * @param uri a String representing a SPIFFE ID | ||
| */ | ||
| public static SpiffeId parse(String uri) { | ||
| doInitialUriValidation(uri); | ||
| checkArgument(uri.toLowerCase(Locale.US).startsWith(PREFIX), "Spiffe Id must start with " | ||
| + PREFIX); | ||
| String domainAndPath = uri.substring(PREFIX.length()); | ||
| String trustDomain; | ||
| String path; | ||
| if (!domainAndPath.contains("/")) { | ||
| trustDomain = domainAndPath; | ||
| path = ""; | ||
| } else { | ||
| String[] parts = domainAndPath.split("/", 2); | ||
| trustDomain = parts[0]; | ||
| path = parts[1]; | ||
| checkArgument(!path.isEmpty(), "Path must not include a trailing '/'"); | ||
| } | ||
| validateTrustDomain(trustDomain); | ||
| validatePath(path); | ||
| if (!path.isEmpty()) { | ||
| path = "/" + path; | ||
| } | ||
| return new SpiffeId(trustDomain, path); | ||
| } | ||
|
|
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| private static void doInitialUriValidation(String uri) { | ||
| checkArgument(checkNotNull(uri, "uri").length() > 0, "Spiffe Id can't be empty"); | ||
| checkArgument(uri.length() <= 2048, "Spiffe Id maximum length is 2048 characters"); | ||
| checkArgument(!uri.contains("#"), "Spiffe Id must not contain query fragments"); | ||
| checkArgument(!uri.contains("?"), "Spiffe Id must not contain query parameters"); | ||
| } | ||
|
|
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| private static void validateTrustDomain(String trustDomain) { | ||
| checkArgument(!trustDomain.isEmpty(), "Trust Domain can't be empty"); | ||
| checkArgument(trustDomain.length() < 256, "Trust Domain maximum length is 255 characters"); | ||
| checkArgument(trustDomain.matches("[a-z0-9._-]+"), | ||
| "Trust Domain must contain only letters, numbers, dots, dashes, and underscores" | ||
| + " ([a-z0-9.-_])"); | ||
| } | ||
|
|
||
| private static void validatePath(String path) { | ||
| if (path.isEmpty()) { | ||
| return; | ||
| } | ||
| checkArgument(!path.endsWith("/"), "Path must not include a trailing '/'"); | ||
| for (String segment : Splitter.on("/").split(path)) { | ||
| validatePathSegment(segment); | ||
| } | ||
| } | ||
|
|
||
| private static void validatePathSegment(String pathSegment) { | ||
| checkArgument(!pathSegment.isEmpty(), "Individual path segments must not be empty"); | ||
| checkArgument(!(pathSegment.equals(".") || pathSegment.equals("..")), | ||
| "Individual path segments must not be relative path modifiers (i.e. ., ..)"); | ||
| checkArgument(pathSegment.matches("[a-zA-Z0-9._-]+"), | ||
| "Individual path segments must contain only letters, numbers, dots, dashes, and underscores" | ||
| + " ([a-zA-Z0-9.-_])"); | ||
| } | ||
|
|
||
| /** | ||
| * Represents a SPIFFE ID as defined in the SPIFFE standard. | ||
| * @see <a href="https://github.com/spiffe/spiffe/blob/master/standards/SPIFFE-ID.md">Standard</a> | ||
| */ | ||
| public static class SpiffeId { | ||
|
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| private final String trustDomain; | ||
| private final String path; | ||
|
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| private SpiffeId(String trustDomain, String path) { | ||
| this.trustDomain = trustDomain; | ||
| this.path = path; | ||
| } | ||
|
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| public String getTrustDomain() { | ||
| return trustDomain; | ||
| } | ||
|
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| public String getPath() { | ||
| return path; | ||
| } | ||
| } | ||
|
|
||
| } |
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