This repository was archived by the owner on Jul 31, 2025. It is now read-only.
forked from hub4j/github-api
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathRequester.java
More file actions
513 lines (446 loc) · 16.8 KB
/
Requester.java
File metadata and controls
513 lines (446 loc) · 16.8 KB
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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
/*
* The MIT License
*
* Copyright (c) 2010, Kohsuke Kawaguchi
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.kohsuke.github;
import com.fasterxml.jackson.databind.JsonMappingException;
import org.apache.commons.io.IOUtils;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.GZIPInputStream;
import static java.util.Arrays.asList;
import static org.kohsuke.github.GitHub.*;
/**
* A builder pattern for making HTTP call and parsing its output.
*
* @author Kohsuke Kawaguchi
*/
class Requester {
private static final List<String> METHODS_WITHOUT_BODY = asList("GET", "DELETE");
private final GitHub root;
private final List<Entry> args = new ArrayList<Entry>();
private final Map<String,String> headers = new LinkedHashMap<String, String>();
/**
* Request method.
*/
private String method = "POST";
private String contentType = "application/x-www-form-urlencoded";
private InputStream body;
/**
* Current connection.
*/
private HttpURLConnection uc;
private static class Entry {
String key;
Object value;
private Entry(String key, Object value) {
this.key = key;
this.value = value;
}
}
Requester(GitHub root) {
this.root = root;
}
/**
* Sets the request HTTP header.
*
* If a header of the same name is already set, this method overrides it.
*/
public void setHeader(String name, String value) {
headers.put(name,value);
}
/**
* Makes a request with authentication credential.
*/
@Deprecated
public Requester withCredential() {
// keeping it inline with retrieveWithAuth not to enforce the check
// root.requireCredential();
return this;
}
public Requester with(String key, int value) {
return _with(key, value);
}
public Requester with(String key, Integer value) {
if (value!=null)
_with(key, value);
return this;
}
public Requester with(String key, boolean value) {
return _with(key, value);
}
public Requester with(String key, Boolean value) {
return _with(key, value);
}
public Requester with(String key, String value) {
return _with(key, value);
}
public Requester with(String key, Collection<String> value) {
return _with(key, value);
}
public Requester with(String key, Map<String, String> value) {
return _with(key, value);
}
public Requester with(InputStream body) {
this.body = body;
return this;
}
public Requester _with(String key, Object value) {
if (value!=null) {
args.add(new Entry(key,value));
}
return this;
}
/**
* Unlike {@link #with(String, String)}, overrides the existing value
*/
public Requester set(String key, Object value) {
for (Entry e : args) {
if (e.key.equals(key)) {
e.value = value;
return this;
}
}
return _with(key,value);
}
public Requester method(String method) {
this.method = method;
return this;
}
public Requester contentType(String contentType) {
this.contentType = contentType;
return this;
}
public void to(String tailApiUrl) throws IOException {
to(tailApiUrl,null);
}
/**
* Sends a request to the specified URL, and parses the response into the given type via databinding.
*
* @throws IOException
* if the server returns 4xx/5xx responses.
* @return
* {@link Reader} that reads the response.
*/
public <T> T to(String tailApiUrl, Class<T> type) throws IOException {
return _to(tailApiUrl, type, null);
}
/**
* Like {@link #to(String, Class)} but updates an existing object instead of creating a new instance.
*/
public <T> T to(String tailApiUrl, T existingInstance) throws IOException {
return _to(tailApiUrl, null, existingInstance);
}
/**
* Short for {@code method(method).to(tailApiUrl,type)}
*/
@Deprecated
public <T> T to(String tailApiUrl, Class<T> type, String method) throws IOException {
return method(method).to(tailApiUrl,type);
}
private <T> T _to(String tailApiUrl, Class<T> type, T instance) throws IOException {
while (true) {// loop while API rate limit is hit
if (METHODS_WITHOUT_BODY.contains(method) && !args.isEmpty()) {
StringBuilder qs=new StringBuilder();
for (Entry arg : args) {
qs.append(qs.length()==0 ? '?' : '&');
qs.append(arg.key).append('=').append(URLEncoder.encode(arg.value.toString(),"UTF-8"));
}
tailApiUrl += qs.toString();
}
setupConnection(root.getApiURL(tailApiUrl));
buildRequest();
try {
T result = parse(type, instance);
if (type != null && type.isArray()) { // we might have to loop for pagination - done through recursion
final String links = uc.getHeaderField("link");
if (links != null && links.contains("rel=\"next\"")) {
Pattern nextLinkPattern = Pattern.compile(".*<(.*)>; rel=\"next\"");
Matcher nextLinkMatcher = nextLinkPattern.matcher(links);
if (nextLinkMatcher.find()) {
final String link = nextLinkMatcher.group(1);
T nextResult = _to(link, type, instance);
final int resultLength = Array.getLength(result);
final int nextResultLength = Array.getLength(nextResult);
T concatResult = (T) Array.newInstance(type.getComponentType(), resultLength + nextResultLength);
System.arraycopy(result, 0, concatResult, 0, resultLength);
System.arraycopy(nextResult, 0, concatResult, resultLength, nextResultLength);
result = concatResult;
}
}
}
return result;
} catch (IOException e) {
handleApiError(e);
}
}
}
/**
* Makes a request and just obtains the HTTP status code.
*/
public int asHttpStatusCode(String tailApiUrl) throws IOException {
while (true) {// loop while API rate limit is hit
setupConnection(root.getApiURL(tailApiUrl));
buildRequest();
try {
return uc.getResponseCode();
} catch (IOException e) {
handleApiError(e);
}
}
}
public InputStream asStream(String tailApiUrl) throws IOException {
while (true) {// loop while API rate limit is hit
setupConnection(root.getApiURL(tailApiUrl));
buildRequest();
try {
return wrapStream(uc.getInputStream());
} catch (IOException e) {
handleApiError(e);
}
}
}
public String getResponseHeader(String header) {
return uc.getHeaderField(header);
}
/**
* Set up the request parameters or POST payload.
*/
private void buildRequest() throws IOException {
if (isMethodWithBody()) {
uc.setDoOutput(true);
uc.setRequestProperty("Content-type", contentType);
if (body == null) {
Map json = new HashMap();
for (Entry e : args) {
json.put(e.key, e.value);
}
MAPPER.writeValue(uc.getOutputStream(), json);
} else {
try {
byte[] bytes = new byte[32768];
int read = 0;
while ((read = body.read(bytes)) != -1) {
uc.getOutputStream().write(bytes, 0, read);
}
} finally {
body.close();
}
}
}
}
private boolean isMethodWithBody() {
return !METHODS_WITHOUT_BODY.contains(method);
}
/**
* Loads pagenated resources.
*
* Every iterator call reports a new batch.
*/
/*package*/ <T> Iterator<T> asIterator(final String _tailApiUrl, final Class<T> type) {
method("GET");
final StringBuilder strBuilder = new StringBuilder(_tailApiUrl);
if (!args.isEmpty()) {
boolean first=true;
try {
for (Entry a : args) {
strBuilder.append(first ? '?' : '&');
first = false;
strBuilder.append(URLEncoder.encode(a.key, "UTF-8"));
strBuilder.append('=');
strBuilder.append(URLEncoder.encode(a.value.toString(), "UTF-8"));
}
} catch (UnsupportedEncodingException e) {
throw new AssertionError(e); // UTF-8 is mandatory
}
}
final String tailApiUrl = strBuilder.toString();
return new Iterator<T>() {
/**
* The next batch to be returned from {@link #next()}.
*/
T next;
/**
* URL of the next resource to be retrieved, or null if no more data is available.
*/
URL url;
{
try {
url = root.getApiURL(tailApiUrl);
} catch (IOException e) {
throw new Error(e);
}
}
public boolean hasNext() {
fetch();
return next!=null;
}
public T next() {
fetch();
T r = next;
if (r==null) throw new NoSuchElementException();
next = null;
return r;
}
public void remove() {
throw new UnsupportedOperationException();
}
private void fetch() {
if (next!=null) return; // already fetched
if (url==null) return; // no more data to fetch
try {
while (true) {// loop while API rate limit is hit
setupConnection(url);
try {
next = parse(type,null);
assert next!=null;
findNextURL();
return;
} catch (IOException e) {
handleApiError(e);
}
}
} catch (IOException e) {
throw new Error(e);
}
}
/**
* Locate the next page from the pagination "Link" tag.
*/
private void findNextURL() throws MalformedURLException {
url = null; // start defensively
String link = uc.getHeaderField("Link");
if (link==null) return;
for (String token : link.split(", ")) {
if (token.endsWith("rel=\"next\"")) {
// found the next page. This should look something like
// <https://api.github.com/repos?page=3&per_page=100>; rel="next"
int idx = token.indexOf('>');
url = new URL(token.substring(1,idx));
return;
}
}
// no more "next" link. we are done.
}
};
}
private void setupConnection(URL url) throws IOException {
uc = root.getConnector().connect(url);
// if the authentication is needed but no credential is given, try it anyway (so that some calls
// that do work with anonymous access in the reduced form should still work.)
if (root.encodedAuthorization!=null)
uc.setRequestProperty("Authorization", root.encodedAuthorization);
for (Map.Entry<String, String> e : headers.entrySet()) {
String v = e.getValue();
if (v!=null)
uc.setRequestProperty(e.getKey(), v);
}
try {
uc.setRequestMethod(method);
} catch (ProtocolException e) {
// JDK only allows one of the fixed set of verbs. Try to override that
try {
Field $method = HttpURLConnection.class.getDeclaredField("method");
$method.setAccessible(true);
$method.set(uc,method);
} catch (Exception x) {
throw (IOException)new IOException("Failed to set the custom verb").initCause(x);
}
}
uc.setRequestProperty("Accept-Encoding", "gzip");
}
private <T> T parse(Class<T> type, T instance) throws IOException {
if (uc.getResponseCode()==304)
return null; // special case handling for 304 unmodified, as the content will be ""
InputStreamReader r = null;
try {
r = new InputStreamReader(wrapStream(uc.getInputStream()), "UTF-8");
String data = IOUtils.toString(r);
if (type!=null)
try {
return MAPPER.readValue(data,type);
} catch (JsonMappingException e) {
throw (IOException)new IOException("Failed to deserialize "+data).initCause(e);
}
if (instance!=null)
return MAPPER.readerForUpdating(instance).<T>readValue(data);
return null;
} finally {
IOUtils.closeQuietly(r);
}
}
/**
* Handles the "Content-Encoding" header.
*/
private InputStream wrapStream(InputStream in) throws IOException {
String encoding = uc.getContentEncoding();
if (encoding==null || in==null) return in;
if (encoding.equals("gzip")) return new GZIPInputStream(in);
throw new UnsupportedOperationException("Unexpected Content-Encoding: "+encoding);
}
/**
* Handle API error by either throwing it or by returning normally to retry.
*/
/*package*/ void handleApiError(IOException e) throws IOException {
if (uc.getResponseCode() == 401) // Unauthorized == bad creds
throw e;
if ("0".equals(uc.getHeaderField("X-RateLimit-Remaining"))) {
root.rateLimitHandler.onError(e,uc);
}
InputStream es = wrapStream(uc.getErrorStream());
try {
if (es!=null) {
if (e instanceof FileNotFoundException) {
// pass through 404 Not Found to allow the caller to handle it intelligently
throw (IOException) new FileNotFoundException(IOUtils.toString(es, "UTF-8")).initCause(e);
} else
throw (IOException) new IOException(IOUtils.toString(es, "UTF-8")).initCause(e);
} else
throw e;
} finally {
IOUtils.closeQuietly(es);
}
}
}