aboutsummaryrefslogtreecommitdiffstats
path: root/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/LfsProtocolServlet.java
blob: e6a5ef90fcb5f52e9b9a7e05251d6d8ade21d899 (plain)
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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*
 * Copyright (C) 2015, Sasa Zivkov <sasa.zivkov@sap.com>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.eclipse.jgit.lfs.server;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.apache.http.HttpStatus.SC_FORBIDDEN;
import static org.apache.http.HttpStatus.SC_NOT_FOUND;
import static org.apache.http.HttpStatus.SC_OK;
import static org.apache.http.HttpStatus.SC_SERVICE_UNAVAILABLE;
import static org.apache.http.HttpStatus.SC_UNPROCESSABLE_ENTITY;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jgit.lfs.errors.LfsException;
import org.eclipse.jgit.lfs.errors.LfsRepositoryNotFound;
import org.eclipse.jgit.lfs.errors.LfsRepositoryReadOnly;
import org.eclipse.jgit.lfs.errors.LfsValidationError;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * LFS protocol handler implementing the LFS batch API [1]
 *
 * [1] https://github.com/github/git-lfs/blob/master/docs/api/v1/http-v1-batch.md
 *
 * @since 4.3
 */
public abstract class LfsProtocolServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	private static final String CONTENTTYPE_VND_GIT_LFS_JSON = "application/vnd.git-lfs+json"; //$NON-NLS-1$

	private Gson gson = createGson();

	/**
	 * Get the large file repository for the given request and path.
	 *
	 * @param request
	 *            the request
	 * @param path
	 *            the path
	 *
	 * @return the large file repository storing large files or null if the
	 *         request is not supported.
	 * @throws LfsException
	 * @since 4.5
	 */
	protected abstract LargeFileRepository getLargeFileRepository(
			LfsRequest request, String path) throws LfsException;

	/**
	 * LFS request.
	 *
	 * @since 4.5
	 */
	protected static class LfsRequest {
		private String operation;

		private List<LfsObject> objects;

		/**
		 * Get the LFS operation.
		 *
		 * @return the operation
		 */
		public String getOperation() {
			return operation;
		}

		/**
		 * Get the LFS objects.
		 *
		 * @return the objects
		 */
		public List<LfsObject> getObjects() {
			return objects;
		}
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		Writer w = new BufferedWriter(
				new OutputStreamWriter(res.getOutputStream(), UTF_8));

		Reader r = new BufferedReader(new InputStreamReader(req.getInputStream(), UTF_8));
		LfsRequest request = gson.fromJson(r, LfsRequest.class);
		String path = req.getPathInfo();

		LargeFileRepository repo = null;
		try {
			repo = getLargeFileRepository(request, path);
		} catch (LfsValidationError e) {
			sendError(res, SC_UNPROCESSABLE_ENTITY, e.getMessage());
			return;
		} catch (LfsRepositoryNotFound e) {
			sendError(res, SC_NOT_FOUND, e.getMessage());
			return;
		} catch (LfsRepositoryReadOnly e) {
			sendError(res, SC_FORBIDDEN, e.getMessage());
			return;
		} catch (LfsException e) {
			sendError(res, SC_SERVICE_UNAVAILABLE, e.getMessage());
			return;
		}
		if (repo == null) {
			res.setStatus(SC_SERVICE_UNAVAILABLE);
			return;
		}

		res.setStatus(SC_OK);
		res.setContentType(CONTENTTYPE_VND_GIT_LFS_JSON);
		TransferHandler handler = TransferHandler
				.forOperation(request.operation, repo, request.objects);
		gson.toJson(handler.process(), w);
		w.flush();
	}

	static class Error {
		String message;

		Error(String m) {
			this.message = m;
		}
	}

	private void sendError(HttpServletResponse rsp, int status, String message)
			throws IOException {
		rsp.setStatus(status);
		PrintWriter writer = rsp.getWriter();
		gson.toJson(new Error(message), writer);
		writer.flush();
		writer.close();
		rsp.flushBuffer();
	}

	private Gson createGson() {
		GsonBuilder gb = new GsonBuilder()
				.setFieldNamingPolicy(
						FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
				.setPrettyPrinting().disableHtmlEscaping();
		return gb.create();
	}
}