1
|
package eu.dnetlib.download.plugin;
|
2
|
|
3
|
import com.google.common.base.Function;
|
4
|
import com.google.common.collect.Iterables;
|
5
|
import com.google.gson.Gson;
|
6
|
import eu.dnetlib.data.download.rmi.AbstractDownloadPlugin;
|
7
|
import eu.dnetlib.data.download.rmi.DownloadItem;
|
8
|
import eu.dnetlib.data.download.rmi.DownloadPlugin;
|
9
|
import eu.dnetlib.data.download.rmi.DownloadPluginException;
|
10
|
import org.apache.commons.logging.Log;
|
11
|
import org.apache.commons.logging.LogFactory;
|
12
|
import org.jsoup.Jsoup;
|
13
|
import org.jsoup.nodes.Document;
|
14
|
import org.jsoup.nodes.Element;
|
15
|
import org.jsoup.select.Elements;
|
16
|
|
17
|
import java.net.HttpURLConnection;
|
18
|
import java.net.URL;
|
19
|
import java.util.ArrayList;
|
20
|
import java.util.List;
|
21
|
|
22
|
public class DSpacePDFLinkPlugins extends AbstractDownloadPlugin implements DownloadPlugin {
|
23
|
|
24
|
/**
|
25
|
* The Constant log.
|
26
|
*/
|
27
|
private static final Log log = LogFactory.getLog(DSpacePDFLinkPlugins.class);
|
28
|
|
29
|
private final static int maxNumberJump = 10;
|
30
|
|
31
|
|
32
|
|
33
|
private String getHTTPRedirectedURL(final String mainURL) throws Exception {
|
34
|
URL startURL = new URL(mainURL);
|
35
|
HttpURLConnection conn = (HttpURLConnection) startURL.openConnection();
|
36
|
|
37
|
conn.setConnectTimeout(AbstractDownloadPlugin.DEFAULT_TIMEOUT);
|
38
|
|
39
|
conn.setInstanceFollowRedirects(true); // you still need to handle redirect manully.
|
40
|
HttpURLConnection.setFollowRedirects(true);
|
41
|
String location = mainURL;
|
42
|
|
43
|
int numJump =1;
|
44
|
|
45
|
int responseCode = conn.getResponseCode();
|
46
|
|
47
|
while ((responseCode >= 300) && (responseCode < 400) && (numJump++ < maxNumberJump)) {
|
48
|
location = conn.getHeaderFields().get("Location").get(0);
|
49
|
conn.disconnect();
|
50
|
startURL = new URL(location);
|
51
|
conn = (HttpURLConnection) startURL.openConnection();
|
52
|
conn.setConnectTimeout(AbstractDownloadPlugin.DEFAULT_TIMEOUT);
|
53
|
conn.setInstanceFollowRedirects(true); // you still need to handle redirect manully.
|
54
|
HttpURLConnection.setFollowRedirects(true);
|
55
|
responseCode = conn.getResponseCode();
|
56
|
}
|
57
|
conn.disconnect();
|
58
|
if (!((responseCode >= 200) && (responseCode < 300)))
|
59
|
return null;
|
60
|
return location;
|
61
|
}
|
62
|
|
63
|
|
64
|
/**
|
65
|
* Extract url.
|
66
|
*
|
67
|
* @param url the url
|
68
|
* @return the string
|
69
|
*/
|
70
|
@Override
|
71
|
public String extractURL(final String url) throws DownloadPluginException {
|
72
|
try {
|
73
|
|
74
|
final String location = getHTTPRedirectedURL(url);
|
75
|
|
76
|
if (location == null)
|
77
|
return null;
|
78
|
Document doc = Jsoup.connect(location).get();
|
79
|
Elements links = doc.select("meta[content$=.pdf]");
|
80
|
|
81
|
for (Element link : links) {
|
82
|
String linkValue = link.attr("content");
|
83
|
if (regularExpression != null) {
|
84
|
for (String regex : regularExpression) {
|
85
|
if (linkValue.matches(regex))
|
86
|
return linkValue;
|
87
|
}
|
88
|
} else
|
89
|
return linkValue;
|
90
|
}
|
91
|
return null;
|
92
|
} catch (Throwable e) {
|
93
|
throw new DownloadPluginException("Error on extract URL", e);
|
94
|
}
|
95
|
|
96
|
}
|
97
|
|
98
|
@Override
|
99
|
public Iterable<DownloadItem> retrieveUrls(final Iterable<DownloadItem> urls) {
|
100
|
return Iterables.transform(urls, input -> retrieveUrl(input));
|
101
|
}
|
102
|
|
103
|
/*
|
104
|
* (non-Javadoc)
|
105
|
*
|
106
|
* @see eu.dnetlib.data.download.rmi.DownloadPlugin#getPluginName()
|
107
|
*/
|
108
|
@Override
|
109
|
public String getPluginName() {
|
110
|
return "DSpacePDFLinkPlugins";
|
111
|
}
|
112
|
|
113
|
/*
|
114
|
* (non-Javadoc)
|
115
|
*
|
116
|
* @see eu.dnetlib.data.download.rmi.DownloadPlugin#retrieveUrl(eu.dnetlib.data.download.rmi.DownloadItem)
|
117
|
*/
|
118
|
@Override
|
119
|
public DownloadItem retrieveUrl(final DownloadItem input) {
|
120
|
if (checkOpenAccess(input) == null) return null;
|
121
|
String url = input.getOriginalUrl();
|
122
|
|
123
|
if ((url == null) || (url.trim().length() == 0)) return input;
|
124
|
@SuppressWarnings("unchecked")
|
125
|
List<String> urls = new Gson().fromJson(url, ArrayList.class);
|
126
|
if ((urls == null) || (urls.size() == 0)) return input;
|
127
|
if (checkUrlsNotNull(input, urls))
|
128
|
return input;
|
129
|
input.setOriginalUrl(null);
|
130
|
input.setUrl(null);
|
131
|
return input;
|
132
|
}
|
133
|
|
134
|
@Override
|
135
|
public void setBasePath(final String basePath) {
|
136
|
// TODO Auto-generated method stub
|
137
|
|
138
|
}
|
139
|
|
140
|
}
|