1 /*
2 * Copyright (C) 2015, Sasa Zivkov <sasa.zivkov@sap.com>
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43 package org.eclipse.jgit.lfs.server;
44
45 import static java.nio.charset.StandardCharsets.UTF_8;
46 import static javax.servlet.http.HttpServletResponse.SC_OK;
47 import static javax.servlet.http.HttpServletResponse.SC_SERVICE_UNAVAILABLE;
48
49 import java.io.BufferedReader;
50 import java.io.BufferedWriter;
51 import java.io.IOException;
52 import java.io.InputStreamReader;
53 import java.io.OutputStreamWriter;
54 import java.io.Reader;
55 import java.io.Writer;
56 import java.util.List;
57
58 import javax.servlet.ServletException;
59 import javax.servlet.http.HttpServlet;
60 import javax.servlet.http.HttpServletRequest;
61 import javax.servlet.http.HttpServletResponse;
62
63 import com.google.gson.FieldNamingPolicy;
64 import com.google.gson.Gson;
65 import com.google.gson.GsonBuilder;
66
67 /**
68 * LFS protocol handler implementing the LFS batch API [1]
69 *
70 * [1] https://github.com/github/git-lfs/blob/master/docs/api/http-v1-batch.md
71 *
72 * @since 4.3
73 */
74 public abstract class LfsProtocolServlet extends HttpServlet {
75
76 private static final long serialVersionUID = 1L;
77
78 private static final String CONTENTTYPE_VND_GIT_LFS_JSON = "application/vnd.git-lfs+json"; //$NON-NLS-1$
79
80 private Gson gson = createGson();
81
82 /**
83 * Get the large file repository
84 *
85 * @return the large file repository storing large files
86 */
87 protected abstract LargeFileRepository getLargeFileRepository();
88
89 @Override
90 protected void doPost(HttpServletRequest req, HttpServletResponse res)
91 throws ServletException, IOException {
92 res.setStatus(SC_OK);
93 res.setContentType(CONTENTTYPE_VND_GIT_LFS_JSON);
94
95 Writer w = new BufferedWriter(
96 new OutputStreamWriter(res.getOutputStream(), UTF_8));
97
98 Reader r = new BufferedReader(new InputStreamReader(req.getInputStream(), UTF_8));
99 LfsRequest request = gson.fromJson(r, LfsRequest.class);
100
101 LargeFileRepository repo = getLargeFileRepository();
102 if (repo == null) {
103 res.setStatus(SC_SERVICE_UNAVAILABLE);
104 return;
105 }
106
107 TransferHandler handler = TransferHandler
108 .forOperation(request.operation, repo, request.objects);
109 gson.toJson(handler.process(), w);
110 w.flush();
111 }
112
113 private static class LfsRequest {
114 String operation;
115
116 List<LfsObject> objects;
117 }
118
119 private static Gson createGson() {
120 GsonBuilder gb = new GsonBuilder()
121 .setFieldNamingPolicy(
122 FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
123 .setPrettyPrinting().disableHtmlEscaping();
124 return gb.create();
125 }
126 }