1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package android.signature.cts;
17 
18 import java.io.File;
19 import java.io.FileInputStream;
20 import java.io.IOException;
21 import java.io.InputStream;
22 import java.net.URL;
23 import java.util.zip.ZipEntry;
24 import java.util.zip.ZipFile;
25 
26 /**
27  * Workaround for the lack of a zip file system provider on Android.
28  */
29 public abstract class VirtualPath {
30 
31     /**
32      * Get a path to the local file system.
33      */
get(String path)34     public static LocalFilePath get(String path) {
35         return new LocalFilePath(path);
36     }
37 
38     /**
39      * Get a path to an entry in a zip file, i.e. a zip file system.
40      */
get(ZipFile zip, ZipEntry entry)41     public static ZipEntryPath get(ZipFile zip, ZipEntry entry) {
42         return new ZipEntryPath(zip, entry);
43     }
44 
45     /**
46      * Get a path to a resource in a ClassLoader.
47      *
48      * @param classLoader the ClassLoader containing the resource.
49      * @param resourceName the name of the resource, must not start with a /.
50      */
get(ClassLoader classLoader, String resourceName)51     public static ResourcePath get(ClassLoader classLoader, String resourceName)
52             throws IOException {
53         return new ResourcePath(classLoader, resourceName);
54     }
55 
newInputStream()56     public abstract InputStream newInputStream() throws IOException;
57 
58     public static class LocalFilePath extends VirtualPath {
59         private final String path;
60 
LocalFilePath(String path)61         LocalFilePath(String path) {
62             this.path = path;
63         }
64 
toFile()65         public File toFile() {
66             return new File(path);
67         }
68 
resolve(String relative)69         public LocalFilePath resolve(String relative) {
70             return new LocalFilePath(path + "/" + relative);
71         }
72 
73         @Override
newInputStream()74         public InputStream newInputStream() throws IOException {
75             return new FileInputStream(path);
76         }
77 
78         @Override
toString()79         public String toString() {
80             return path;
81         }
82     }
83 
84     private static class ZipEntryPath extends VirtualPath {
85 
86         private final ZipFile zip;
87 
88         private final ZipEntry entry;
89 
ZipEntryPath(ZipFile zip, ZipEntry entry)90         private ZipEntryPath(ZipFile zip, ZipEntry entry) {
91             this.zip = zip;
92             this.entry = entry;
93         }
94 
95         @Override
newInputStream()96         public InputStream newInputStream() throws IOException {
97             return zip.getInputStream(entry);
98         }
99 
100         @Override
toString()101         public String toString() {
102             return "zip:file:" + zip.getName() + "!/" + entry.getName();
103         }
104     }
105 
106     public static class ResourcePath extends VirtualPath {
107         private final URL url;
108 
ResourcePath(ClassLoader classLoader, String path)109         ResourcePath(ClassLoader classLoader, String path) throws IOException {
110             this.url = classLoader.getResource(path);
111             if (url == null) {
112                 throw new IOException("Could not find resource '" + path + "' in " + classLoader);
113             }
114         }
115 
116         @Override
newInputStream()117         public InputStream newInputStream() throws IOException {
118             return url.openStream();
119         }
120 
121         @Override
toString()122         public String toString() {
123             return url.toExternalForm();
124         }
125     }
126 }
127