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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
package org.madore.damlengine;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.Properties;
import java.util.Enumeration;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/* Thinkos about the mess that is tomcat:
* - Make sure that /usr/share/java/postgresql-jdbc4.jar (or whatever
* contains the class org.postgresql.Driver) is symlinked from
* /var/lib/tomcat7/common (or some path listed in the common.loader
* property of the catalina.properties file). Similarly,
* xercesImpl.jar and probably xml-resolver.jar need to be linked.
* - The following parameters need to be defined in <init-param> tags
* inside the <servlet> block: base_path, template_path, pghost,
* pgport, dbname, pguser and pgpass or pgpassfile.
*/
public class WeblogServlet extends HttpServlet {
private static final long serialVersionUID = 2014101204L;
@Override
public void init(ServletConfig cfg)
throws ServletException
{
super.init(cfg); // Important!
synchronized ( DamlEngine.class ) { if ( DamlEngine.appProps == null ) {
DamlEngine.runAsServlet = true;
DamlEngine.appProps = new Properties();
for (Enumeration<String> e = cfg.getInitParameterNames() ; e.hasMoreElements() ; ) {
String k = e.nextElement();
DamlEngine.appProps.setProperty(k, cfg.getInitParameter(k));
}
if ( DamlEngine.appProps.getProperty("base_path") != null )
DamlEngine.basePath = Paths.get(DamlEngine.appProps.getProperty("base_path"));
if ( DamlEngine.basePath == null )
DamlEngine.basePath = Paths.get(getServletContext().getRealPath("/"));
if ( DamlEngine.appProps.getProperty("template_path") != null )
DamlEngine.templatePath = Paths.get(DamlEngine.appProps.getProperty("template_path"));
if ( DamlEngine.templatePath == null )
DamlEngine.templatePath = DamlEngine.basePath.resolve("templates");
} }
}
static abstract class RequestPath {
public static RequestPath parsePath(String pathInfo, boolean inGet)
throws ServletException {
Matcher matcher;
if ( pathInfo == null )
return new NoSuchPath();
if ( (matcher=Pattern.compile("/d\\.(\\d{4}-\\d{2}-\\d{2})\\.(\\d{4})(?:\\.([\\p{Alnum}\\-]*))?\\.html").matcher(pathInfo)).matches() ) {
final String date;
final int number;
final String extra;
try {
date = matcher.group(1);
number = Integer.parseInt(matcher.group(2));
extra = matcher.group(3);
} catch (NumberFormatException e) {
return new NoSuchPath();
}
try {
final Connection conn = WeblogDatabaseConnection.getConnection();
final PreparedStatement selSt
= conn.prepareStatement("SELECT id , extract(epoch from mdate) , special_name FROM entries WHERE edate=? AND id=?");
selSt.setString(1,date);
selSt.setInt(2,number);
final ResultSet selRes = selSt.executeQuery();
if ( selRes.next() ) {
int id = selRes.getInt(1);
double mdate = selRes.getDouble(2);
String specialName = selRes.getString(3);
if ( id != number )
throw new ServletException("this cannot happen");
if ( ! ( ( extra == null && specialName == null )
|| ( extra != null && specialName != null
&& extra.equals(specialName) ) ) )
return new SingleBlogEntryRedirectPath(date, id, specialName);
long lastModified = (long)(mdate*1000);
long thisLastModified;
try {
// Attempts to detect when *this* class was last modified.
thisLastModified = WeblogServlet.class.getResource("WeblogServlet.class").openConnection().getLastModified();
} catch (Exception e) {
thisLastModified = 0;
}
if ( thisLastModified > lastModified )
lastModified = thisLastModified;
return new SingleBlogEntryPath(number, lastModified);
} else
return new NoSuchPath();
} catch (SQLException e) {
throw new ServletException(e);
}
}
// Legacy support for an old permalink format:
if ( inGet && (matcher=Pattern.compile("/d\\.(\\d{4}-\\d{2}-\\d{2})\\.([\\p{Alpha}][\\p{Alnum}\\-]*)\\.html").matcher(pathInfo)).matches() ) {
final String date;
final String extra;
try {
date = matcher.group(1);
extra = matcher.group(2);
} catch (NumberFormatException e) {
return new NoSuchPath();
}
try {
final Connection conn = WeblogDatabaseConnection.getConnection();
final PreparedStatement selSt
= conn.prepareStatement("SELECT id FROM entries WHERE edate=? AND special_name=?");
selSt.setString(1,date);
selSt.setString(2,extra);
final ResultSet selRes = selSt.executeQuery();
if ( selRes.next() ) {
int id = selRes.getInt(1);
return new SingleBlogEntryRedirectPath(date, id, extra);
} else
return new NoSuchPath();
} catch (SQLException e) {
throw new ServletException(e);
}
}
return new NoSuchPath();
}
}
static final class NoSuchPath extends RequestPath { }
static final class SingleBlogEntryPath extends RequestPath {
public int number;
public long lastModified;
public SingleBlogEntryPath(int number, long lastModified) {
this.number = number;
this.lastModified = lastModified;
}
}
static final class SingleBlogEntryRedirectPath extends RequestPath {
public String date;
public int number;
public String extra; // May be null (passed to WeblogLink class)
public SingleBlogEntryRedirectPath(String date, int number, String extra) {
this.date = date;
this.number = number;
this.extra = extra;
}
}
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
final RequestPath rp = RequestPath.parsePath(request.getPathInfo(), true);
if ( rp instanceof NoSuchPath ) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
if ( rp instanceof SingleBlogEntryRedirectPath ) {
SingleBlogEntryRedirectPath rrp = (SingleBlogEntryRedirectPath)rp;
Matcher matcher = Pattern.compile("(\\d{4})-(\\d{2})-(\\d{2})").matcher(rrp.date);
if ( ! matcher.matches() )
throw new AssertionError("bad date format");
WeblogLink lk = new WeblogLink(matcher.group(1), matcher.group(2),
matcher.group(3),
String.format("%04d", rrp.number),
"", rrp.extra);
lk.setTypeStandard();
String basePath = request.getScheme() + "://"
+ request.getServerName()
+ ":" + request.getServerPort()
+ request.getContextPath()
+ "/";
// response.sendRedirect(lk.getFile(basePath));
response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
response.setHeader("Location", lk.getFile(basePath));
return;
}
if ( ! (rp instanceof SingleBlogEntryPath) )
throw new ServletException("this cannot happen");
final int number = ((SingleBlogEntryPath)rp).number;
response.setContentType("text/html; charset=utf-8");
response.setCharacterEncoding("UTF-8");
OutputStream out = response.getOutputStream();
try {
Context.DynamicContext dc = new Context.DynamicContext();
dc.modTime = ((SingleBlogEntryPath)rp).lastModified;
WeblogSelect.fullProcess(new Context.WeblogSingleSelectionContext(number),
dc, out);
} catch (Exception e) {
throw new ServletException("exception during WeblogSelect.fullProcess()", e);
}
}
@Override
public long getLastModified(HttpServletRequest request) {
final RequestPath rp;
try {
rp = RequestPath.parsePath(request.getPathInfo(), false);
} catch (Exception e) {
return -1;
}
if ( rp instanceof SingleBlogEntryPath ) {
final long lastModified = ((SingleBlogEntryPath)rp).lastModified;
return (lastModified/1000)*1000;
}
return -1;
}
}
|
