/
MetaInfAwareClasspathResourceHasher.java
143 lines (127 loc) · 5.6 KB
/
MetaInfAwareClasspathResourceHasher.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*
* Copyright 2020 the original author or 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 org.gradle.api.internal.changedetection.state;
import org.gradle.api.internal.file.archive.ZipEntry;
import org.gradle.internal.hash.HashCode;
import org.gradle.internal.hash.Hasher;
import org.gradle.internal.hash.Hashing;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import java.util.stream.Collectors;
import static java.lang.String.join;
public class MetaInfAwareClasspathResourceHasher implements ResourceHasher {
private static final Logger LOGGER = LoggerFactory.getLogger(MetaInfAwareClasspathResourceHasher.class);
private final ResourceHasher delegate;
private final ResourceEntryFilter attributeResourceFilter;
public MetaInfAwareClasspathResourceHasher(ResourceHasher delegate, ResourceEntryFilter attributeResourceFilter) {
this.delegate = delegate;
this.attributeResourceFilter = attributeResourceFilter;
}
@Override
public void appendConfigurationToHasher(Hasher hasher) {
delegate.appendConfigurationToHasher(hasher);
hasher.putString(getClass().getName());
attributeResourceFilter.appendConfigurationToHasher(hasher);
}
@Nullable
@Override
public HashCode hash(RegularFileSnapshotContext snapshotContext) {
String relativePath = join("/", snapshotContext.getRelativePathSegments().get());
if (isManifestFile(relativePath)) {
return tryHashWithFallback(snapshotContext);
} else {
return delegate.hash(snapshotContext);
}
}
@Nullable
@Override
public HashCode hash(ZipEntryContext zipEntryContext) throws IOException {
ZipEntry zipEntry = zipEntryContext.getEntry();
if (isManifestFile(zipEntry.getName())) {
return tryHashWithFallback(zipEntryContext);
} else {
return delegate.hash(zipEntryContext);
}
}
@Nullable
private HashCode tryHashWithFallback(RegularFileSnapshotContext snapshotContext) {
try (FileInputStream manifestFileInputStream = new FileInputStream(snapshotContext.getSnapshot().getAbsolutePath())) {
return hashManifest(manifestFileInputStream);
} catch (IOException e) {
LOGGER.debug("Could not load fingerprint for " + snapshotContext.getSnapshot().getAbsolutePath() + ". Falling back to full entry fingerprinting", e);
return delegate.hash(snapshotContext);
}
}
@Nullable
private HashCode tryHashWithFallback(ZipEntryContext zipEntryContext) throws IOException {
try {
return hashManifest(zipEntryContext.getEntry().getInputStream());
} catch (IOException e) {
LOGGER.debug("Could not load fingerprint for " + zipEntryContext.getRootParentName() + "!" + zipEntryContext.getFullName() + ". Falling back to full entry fingerprinting", e);
return delegate.hash(zipEntryContext);
}
}
private static boolean isManifestFile(final String name) {
return name.equals("META-INF/MANIFEST.MF");
}
private HashCode hashManifest(InputStream inputStream) throws IOException {
Manifest manifest = new Manifest(inputStream);
Hasher hasher = Hashing.newHasher();
Attributes mainAttributes = manifest.getMainAttributes();
hashManifestAttributes(mainAttributes, "main", hasher);
Map<String, Attributes> entries = manifest.getEntries();
Set<String> names = new TreeSet<>(manifest.getEntries().keySet());
for (String name : names) {
hashManifestAttributes(entries.get(name), name, hasher);
}
return hasher.hash();
}
private void hashManifestAttributes(Attributes attributes, String name, Hasher hasher) {
Map<String, String> entries = attributes
.entrySet()
.stream()
.collect(Collectors.toMap(
entry -> entry.getKey().toString().toLowerCase(Locale.ROOT),
entry -> (String) entry.getValue()
));
List<Map.Entry<String, String>> normalizedEntries = entries.
entrySet()
.stream()
.filter(entry -> !attributeResourceFilter.shouldBeIgnored(entry.getKey()))
.sorted(Map.Entry.comparingByKey())
.collect(Collectors.toList());
// Short-circuiting when there's no matching entries allows empty manifest sections to be ignored
// that allows an manifest without those sections to hash identically to the one with effectively empty sections
if (!normalizedEntries.isEmpty()) {
hasher.putString(name);
for (Map.Entry<String, String> entry : normalizedEntries) {
hasher.putString(entry.getKey());
hasher.putString(entry.getValue());
}
}
}
}