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Copy pathRequester.java
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348 lines (302 loc) · 11.3 KB
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/*
* 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 org.apache.commons.io.IOUtils;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.Reader;
import java.lang.reflect.Field;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.zip.GZIPInputStream;
import static org.kohsuke.github.GitHub.*;
/**
* A builder pattern for making HTTP call and parsing its output.
*
* @author Kohsuke Kawaguchi
*/
class Requester {
private final GitHub root;
private final List<Entry> args = new ArrayList<Entry>();
/**
* Request method.
*/
private String method = "POST";
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;
}
/**
* 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.intValue());
return this;
}
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(String key, Object value) {
if (value!=null) {
args.add(new Entry(key,value));
}
return this;
}
public Requester method(String method) {
this.method = method;
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
HttpURLConnection uc = setupConnection(root.getApiURL(tailApiUrl));
if (!method.equals("GET")) {
uc.setDoOutput(true);
uc.setRequestProperty("Content-type","application/x-www-form-urlencoded");
Map json = new HashMap();
for (Entry e : args) {
json.put(e.key, e.value);
}
MAPPER.writeValue(uc.getOutputStream(),json);
}
try {
return parse(uc,type,instance);
} catch (IOException e) {
handleApiError(e,uc);
}
}
}
/**
* Loads pagenated resources.
*
* Every iterator call reports a new batch.
*/
/*package*/ <T> Iterator<T> asIterator(final String tailApiUrl, final Class<T> type) {
method("GET");
if (!args.isEmpty()) throw new IllegalStateException();
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
HttpURLConnection uc = setupConnection(url);
try {
next = parse(uc,type,null);
assert next!=null;
findNextURL(uc);
return;
} catch (IOException e) {
handleApiError(e,uc);
}
}
} catch (IOException e) {
throw new Error(e);
}
}
/**
* Locate the next page from the pagination "Link" tag.
*/
private void findNextURL(HttpURLConnection uc) 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 HttpURLConnection setupConnection(URL url) throws IOException {
HttpURLConnection uc = (HttpURLConnection) url.openConnection();
// 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 OAuth token is present, it'll be set in the URL, so need to set the Authorization header
if (root.encodedAuthorization!=null && root.oauthAccessToken == null)
uc.setRequestProperty("Authorization", "Basic " + root.encodedAuthorization);
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");
return uc;
}
private <T> T parse(HttpURLConnection uc, Class<T> type, T instance) throws IOException {
InputStreamReader r = null;
try {
r = new InputStreamReader(wrapStream(uc, uc.getInputStream()), "UTF-8");
String data = IOUtils.toString(r);
if (type!=null)
return MAPPER.readValue(data,type);
if (instance!=null)
return MAPPER.readerForUpdating(instance).<T>readValue(data);
return null;
} finally {
IOUtils.closeQuietly(r);
}
}
/**
* Handles the "Content-Encoding" header.
*/
private InputStream wrapStream(HttpURLConnection uc, 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);
}
/**
* If the error is because of the API limit, wait 10 sec and return normally.
* Otherwise throw an exception reporting an error.
*/
/*package*/ void handleApiError(IOException e, HttpURLConnection uc) throws IOException {
if ("0".equals(uc.getHeaderField("X-RateLimit-Remaining"))) {
// API limit reached. wait 10 secs and return normally
try {
Thread.sleep(10000);
return;
} catch (InterruptedException _) {
throw (InterruptedIOException)new InterruptedIOException().initCause(e);
}
}
if (e instanceof FileNotFoundException)
throw e; // pass through 404 Not Found to allow the caller to handle it intelligently
InputStream es = wrapStream(uc, uc.getErrorStream());
try {
if (es!=null)
throw (IOException)new IOException(IOUtils.toString(es,"UTF-8")).initCause(e);
else
throw e;
} finally {
IOUtils.closeQuietly(es);
}
}
}
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