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8816d2f7 NR |
1 | package be.nikiroo.utils; |
2 | ||
3 | import java.io.IOException; | |
4 | import java.io.InputStream; | |
5 | import java.io.OutputStreamWriter; | |
6 | import java.net.CookieHandler; | |
7 | import java.net.CookieManager; | |
8 | import java.net.CookiePolicy; | |
9 | import java.net.CookieStore; | |
10 | import java.net.HttpCookie; | |
11 | import java.net.HttpURLConnection; | |
12 | import java.net.URL; | |
13 | import java.net.URLConnection; | |
14 | import java.net.URLEncoder; | |
15 | import java.util.Map; | |
16 | import java.util.zip.GZIPInputStream; | |
17 | ||
18 | /** | |
19 | * This class will help you download content from Internet Sites ({@link URL} | |
20 | * based). | |
21 | * <p> | |
22 | * It allows you to control some options often required on web sites that do not | |
23 | * want to simply serve HTML, but actively makes your life difficult with stupid | |
24 | * checks. | |
25 | * | |
26 | * @author niki | |
27 | */ | |
28 | public class Downloader { | |
29 | private String UA; | |
30 | private CookieManager cookies; | |
530d4062 | 31 | private TraceHandler tracer = new TraceHandler(); |
f6e8d60d | 32 | private Cache cache; |
8816d2f7 NR |
33 | |
34 | /** | |
35 | * Create a new {@link Downloader}. | |
36 | * | |
37 | * @param UA | |
38 | * the User-Agent to use to download the resources -- note that | |
39 | * some websites require one, some actively blacklist real UAs | |
40 | * like the one from wget, some whitelist a couple of browsers | |
41 | * only (!) | |
42 | */ | |
43 | public Downloader(String UA) { | |
f6e8d60d NR |
44 | this(UA, null); |
45 | } | |
46 | ||
47 | /** | |
48 | * Create a new {@link Downloader}. | |
49 | * | |
50 | * @param UA | |
51 | * the User-Agent to use to download the resources -- note that | |
52 | * some websites require one, some actively blacklist real UAs | |
53 | * like the one from wget, some whitelist a couple of browsers | |
54 | * only (!) | |
55 | * @param cache | |
56 | * the {@link Cache} to use for all access (can be NULL) | |
57 | */ | |
58 | public Downloader(String UA, Cache cache) { | |
8816d2f7 NR |
59 | this.UA = UA; |
60 | ||
15f13472 | 61 | cookies = new CookieManager(null, CookiePolicy.ACCEPT_ALL); |
8816d2f7 | 62 | CookieHandler.setDefault(cookies); |
f6e8d60d | 63 | |
15f13472 | 64 | setCache(cache); |
8816d2f7 NR |
65 | } |
66 | ||
530d4062 NR |
67 | /** |
68 | * The traces handler for this {@link Cache}. | |
69 | * | |
70 | * @return the traces handler | |
71 | */ | |
72 | public TraceHandler getTraceHandler() { | |
73 | return tracer; | |
74 | } | |
75 | ||
76 | /** | |
77 | * The traces handler for this {@link Cache}. | |
78 | * | |
79 | * @param tracer | |
80 | * the new traces handler | |
81 | */ | |
82 | public void setTraceHandler(TraceHandler tracer) { | |
80500544 NR |
83 | if (tracer == null) { |
84 | tracer = new TraceHandler(false, false, false); | |
85 | } | |
86 | ||
530d4062 NR |
87 | this.tracer = tracer; |
88 | } | |
89 | ||
3052163b NR |
90 | /** |
91 | * The {@link Cache} to use for all access (can be NULL). | |
92 | * | |
93 | * @return the cache | |
94 | */ | |
95 | public Cache getCache() { | |
96 | return cache; | |
97 | } | |
98 | ||
99 | /** | |
100 | * The {@link Cache} to use for all access (can be NULL). | |
101 | * | |
102 | * @param cache | |
103 | * the new cache | |
104 | */ | |
105 | public void setCache(Cache cache) { | |
106 | this.cache = cache; | |
107 | } | |
108 | ||
8816d2f7 NR |
109 | /** |
110 | * Clear all the cookies currently in the jar. | |
111 | * <p> | |
112 | * As long as you don't, the cookies are kept. | |
113 | */ | |
114 | public void clearCookies() { | |
115 | cookies.getCookieStore().removeAll(); | |
116 | } | |
117 | ||
118 | /** | |
119 | * Open the given {@link URL} and update the cookies. | |
120 | * | |
121 | * @param url | |
122 | * the {@link URL} to open | |
123 | * @return the {@link InputStream} of the opened page | |
124 | * | |
125 | * @throws IOException | |
126 | * in case of I/O error | |
127 | **/ | |
128 | public InputStream open(URL url) throws IOException { | |
f6e8d60d NR |
129 | return open(url, false); |
130 | } | |
131 | ||
132 | /** | |
133 | * Open the given {@link URL} and update the cookies. | |
134 | * | |
135 | * @param url | |
136 | * the {@link URL} to open | |
137 | * @param stable | |
138 | * stable a stable file (that doesn't change too often) -- | |
139 | * parameter used to check if the file is too old to keep or not | |
140 | * in the cache (default is false) | |
141 | * | |
142 | * @return the {@link InputStream} of the opened page | |
143 | * | |
144 | * @throws IOException | |
145 | * in case of I/O error | |
146 | **/ | |
147 | public InputStream open(URL url, boolean stable) throws IOException { | |
148 | return open(url, url, url, null, null, null, null, stable); | |
8816d2f7 NR |
149 | } |
150 | ||
151 | /** | |
152 | * Open the given {@link URL} and update the cookies. | |
153 | * | |
154 | * @param url | |
155 | * the {@link URL} to open | |
530d4062 NR |
156 | * @param currentReferer |
157 | * the current referer, for websites that needs this info | |
158 | * @param cookiesValues | |
159 | * the cookies | |
8816d2f7 NR |
160 | * @param postParams |
161 | * the POST parameters | |
162 | * @param getParams | |
163 | * the GET parameters (priority over POST) | |
164 | * @param oauth | |
165 | * OAuth authorization (aka, "bearer XXXXXXX") | |
166 | * | |
167 | * @return the {@link InputStream} of the opened page | |
168 | * | |
169 | * @throws IOException | |
170 | * in case of I/O error | |
171 | */ | |
172 | public InputStream open(URL url, URL currentReferer, | |
173 | Map<String, String> cookiesValues, Map<String, String> postParams, | |
174 | Map<String, String> getParams, String oauth) throws IOException { | |
f6e8d60d NR |
175 | return open(url, currentReferer, cookiesValues, postParams, getParams, |
176 | oauth, false); | |
177 | } | |
178 | ||
179 | /** | |
180 | * Open the given {@link URL} and update the cookies. | |
181 | * | |
182 | * @param url | |
183 | * the {@link URL} to open | |
184 | * @param currentReferer | |
185 | * the current referer, for websites that needs this info | |
186 | * @param cookiesValues | |
187 | * the cookies | |
188 | * @param postParams | |
189 | * the POST parameters | |
190 | * @param getParams | |
191 | * the GET parameters (priority over POST) | |
192 | * @param oauth | |
193 | * OAuth authorization (aka, "bearer XXXXXXX") | |
194 | * @param stable | |
195 | * stable a stable file (that doesn't change too often) -- | |
196 | * parameter used to check if the file is too old to keep or not | |
197 | * in the cache (default is false) | |
198 | * | |
199 | * @return the {@link InputStream} of the opened page | |
200 | * | |
201 | * @throws IOException | |
202 | * in case of I/O error | |
203 | */ | |
204 | public InputStream open(URL url, URL currentReferer, | |
205 | Map<String, String> cookiesValues, Map<String, String> postParams, | |
206 | Map<String, String> getParams, String oauth, boolean stable) | |
207 | throws IOException { | |
8816d2f7 | 208 | return open(url, url, currentReferer, cookiesValues, postParams, |
f6e8d60d | 209 | getParams, oauth, stable); |
8816d2f7 NR |
210 | } |
211 | ||
8816d2f7 NR |
212 | /** |
213 | * Open the given {@link URL} and update the cookies. | |
214 | * | |
215 | * @param url | |
216 | * the {@link URL} to open | |
217 | * @param originalUrl | |
ae7d1a83 NR |
218 | * the original {@link URL} before any redirection occurs, which |
219 | * is also used for the cache ID if needed (so we can retrieve | |
220 | * the content with this URL if needed) | |
221 | * @param currentReferer | |
222 | * the current referer, for websites that needs this info | |
223 | * @param cookiesValues | |
224 | * the cookies | |
8816d2f7 NR |
225 | * @param postParams |
226 | * the POST parameters | |
227 | * @param getParams | |
228 | * the GET parameters (priority over POST) | |
229 | * @param oauth | |
230 | * OAuth authorisation (aka, "bearer XXXXXXX") | |
f6e8d60d NR |
231 | * @param stable |
232 | * a stable file (that doesn't change too often) -- parameter | |
233 | * used to check if the file is too old to keep or not in the | |
234 | * cache | |
235 | * | |
8816d2f7 NR |
236 | * @return the {@link InputStream} of the opened page |
237 | * | |
238 | * @throws IOException | |
239 | * in case of I/O error | |
240 | */ | |
ae7d1a83 NR |
241 | public InputStream open(URL url, final URL originalUrl, URL currentReferer, |
242 | Map<String, String> cookiesValues, Map<String, String> postParams, | |
243 | Map<String, String> getParams, String oauth, boolean stable) | |
244 | throws IOException { | |
f6e8d60d NR |
245 | |
246 | tracer.trace("Request: " + url); | |
247 | ||
248 | if (cache != null) { | |
ae7d1a83 | 249 | InputStream in = cache.load(originalUrl, false, stable); |
f6e8d60d | 250 | if (in != null) { |
223aa0d4 NR |
251 | tracer.trace("Use the cache: " + url); |
252 | tracer.trace("Original URL : " + originalUrl); | |
f6e8d60d NR |
253 | return in; |
254 | } | |
255 | } | |
8816d2f7 | 256 | |
530d4062 | 257 | tracer.trace("Download: " + url); |
8816d2f7 NR |
258 | |
259 | URLConnection conn = openConnectionWithCookies(url, currentReferer, | |
260 | cookiesValues); | |
261 | ||
262 | // Priority: GET over POST | |
263 | Map<String, String> params = getParams; | |
264 | if (getParams == null) { | |
265 | params = postParams; | |
266 | } | |
267 | ||
15f13472 | 268 | StringBuilder requestData = null; |
8816d2f7 NR |
269 | if ((params != null || oauth != null) |
270 | && conn instanceof HttpURLConnection) { | |
8816d2f7 NR |
271 | if (params != null) { |
272 | requestData = new StringBuilder(); | |
273 | for (Map.Entry<String, String> param : params.entrySet()) { | |
274 | if (requestData.length() != 0) | |
275 | requestData.append('&'); | |
276 | requestData.append(URLEncoder.encode(param.getKey(), | |
277 | "UTF-8")); | |
278 | requestData.append('='); | |
279 | requestData.append(URLEncoder.encode( | |
280 | String.valueOf(param.getValue()), "UTF-8")); | |
281 | } | |
282 | ||
8816d2f7 NR |
283 | if (getParams == null && postParams != null) { |
284 | ((HttpURLConnection) conn).setRequestMethod("POST"); | |
285 | } | |
286 | ||
287 | conn.setRequestProperty("Content-Type", | |
288 | "application/x-www-form-urlencoded"); | |
15f13472 NR |
289 | conn.setRequestProperty("Content-Length", |
290 | Integer.toString(requestData.length())); | |
8816d2f7 NR |
291 | conn.setRequestProperty("charset", "utf-8"); |
292 | } | |
293 | ||
294 | if (oauth != null) { | |
295 | conn.setRequestProperty("Authorization", oauth); | |
296 | } | |
297 | ||
298 | if (requestData != null) { | |
15f13472 NR |
299 | conn.setDoOutput(true); |
300 | OutputStreamWriter writer = new OutputStreamWriter( | |
301 | conn.getOutputStream()); | |
0988831f | 302 | try { |
0988831f NR |
303 | writer.write(requestData.toString()); |
304 | writer.flush(); | |
305 | } finally { | |
15f13472 | 306 | writer.close(); |
0988831f | 307 | } |
8816d2f7 NR |
308 | } |
309 | } | |
310 | ||
15f13472 NR |
311 | // Manual redirection, much better for POST data |
312 | if (conn instanceof HttpURLConnection) { | |
313 | ((HttpURLConnection) conn).setInstanceFollowRedirects(false); | |
314 | } | |
315 | ||
8816d2f7 NR |
316 | conn.connect(); |
317 | ||
318 | // Check if redirect | |
15f13472 | 319 | // BEWARE! POST data cannot be redirected, so it is ignored here |
6149689f NR |
320 | if (conn instanceof HttpURLConnection) { |
321 | int repCode = 0; | |
322 | try { | |
323 | // Can fail in some circumstances | |
324 | repCode = ((HttpURLConnection) conn).getResponseCode(); | |
325 | } catch (IOException e) { | |
326 | } | |
327 | ||
328 | if (repCode / 100 == 3) { | |
329 | String newUrl = conn.getHeaderField("Location"); | |
330 | return open(new URL(newUrl), originalUrl, currentReferer, | |
15f13472 | 331 | cookiesValues, null, getParams, oauth, stable); |
6149689f | 332 | } |
8816d2f7 NR |
333 | } |
334 | ||
335 | InputStream in = conn.getInputStream(); | |
336 | if ("gzip".equals(conn.getContentEncoding())) { | |
337 | in = new GZIPInputStream(in); | |
338 | } | |
339 | ||
f6e8d60d | 340 | if (in != null && cache != null) { |
76c54eff | 341 | tracer.trace("Save to cache: " + originalUrl); |
f6e8d60d | 342 | try { |
eb6dcdbf NR |
343 | try { |
344 | cache.save(in, originalUrl); | |
345 | } finally { | |
346 | in.close(); | |
347 | } | |
76c54eff | 348 | in = cache.load(originalUrl, true, false); |
f6e8d60d NR |
349 | } catch (IOException e) { |
350 | tracer.error(new IOException( | |
351 | "Cannot save URL to cache, will ignore cache: " + url, | |
352 | e)); | |
353 | } | |
354 | } | |
355 | ||
8816d2f7 NR |
356 | return in; |
357 | } | |
358 | ||
359 | /** | |
360 | * Open a connection on the given {@link URL}, and manage the cookies that | |
361 | * come with it. | |
362 | * | |
363 | * @param url | |
364 | * the {@link URL} to open | |
365 | * | |
366 | * @return the connection | |
367 | * | |
368 | * @throws IOException | |
369 | * in case of I/O error | |
370 | */ | |
371 | private URLConnection openConnectionWithCookies(URL url, | |
372 | URL currentReferer, Map<String, String> cookiesValues) | |
373 | throws IOException { | |
374 | URLConnection conn = url.openConnection(); | |
375 | ||
15f13472 NR |
376 | String cookies = generateCookies(cookiesValues); |
377 | if (cookies != null && !cookies.isEmpty()) { | |
378 | conn.setRequestProperty("Cookie", cookies); | |
379 | } | |
380 | ||
8816d2f7 | 381 | conn.setRequestProperty("User-Agent", UA); |
8816d2f7 | 382 | conn.setRequestProperty("Accept-Encoding", "gzip"); |
15f13472 NR |
383 | conn.setRequestProperty("Accept", "*/*"); |
384 | ||
8816d2f7 NR |
385 | if (currentReferer != null) { |
386 | conn.setRequestProperty("Referer", currentReferer.toString()); | |
387 | conn.setRequestProperty("Host", currentReferer.getHost()); | |
388 | } | |
389 | ||
390 | return conn; | |
391 | } | |
392 | ||
393 | /** | |
394 | * Generate the cookie {@link String} from the local {@link CookieStore} so | |
395 | * it is ready to be passed. | |
396 | * | |
397 | * @return the cookie | |
398 | */ | |
399 | private String generateCookies(Map<String, String> cookiesValues) { | |
400 | StringBuilder builder = new StringBuilder(); | |
401 | for (HttpCookie cookie : cookies.getCookieStore().getCookies()) { | |
402 | if (builder.length() > 0) { | |
403 | builder.append(';'); | |
404 | } | |
405 | ||
8816d2f7 NR |
406 | builder.append(cookie.toString()); |
407 | } | |
408 | ||
409 | if (cookiesValues != null) { | |
410 | for (Map.Entry<String, String> set : cookiesValues.entrySet()) { | |
411 | if (builder.length() > 0) { | |
412 | builder.append(';'); | |
413 | } | |
414 | builder.append(set.getKey()); | |
415 | builder.append('='); | |
416 | builder.append(set.getValue()); | |
417 | } | |
418 | } | |
419 | ||
420 | return builder.toString(); | |
421 | } | |
422 | } |