64 lines
2.5 KiB
Java
64 lines
2.5 KiB
Java
package eu.eudat.logic.proxy;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.*;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.net.*;
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@RestController
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public class Proxy {
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private String allowedHost;
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public Proxy(String allowedHost) throws MalformedURLException {
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this.allowedHost = new URL(allowedHost).getHost();
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}
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public Proxy() {
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}
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@RequestMapping(method = RequestMethod.GET, value = {"/eu/eudat/logic/proxy"}, produces = "application/json")
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public @ResponseBody
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ResponseEntity<Object> proxy(@RequestParam("url") String remoteUrl) {
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StringBuffer response = new StringBuffer();
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URL url;
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try {
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URL tempUrl = new URL(remoteUrl);
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// URI uri = new URI(scheme, userInfo, host, port, path, query, fragment);
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URI uri = new URI(tempUrl.getProtocol(), null, tempUrl.getHost(), tempUrl.getPort(), tempUrl.getPath(), (tempUrl.getQuery() != null) ? URLEncoder.encode(tempUrl.getQuery()) : null, tempUrl.getRef());
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url = uri.toURL();
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if (!url.getHost().equals(allowedHost))
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return ResponseEntity.status(HttpStatus.FORBIDDEN).body("{'reason': 'You are not allowed to eu.eudat.logic.proxy -> " + url.getHost() + "'}");
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//if allowed, proceed
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HttpURLConnection con = (HttpURLConnection) url.openConnection();
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con.setRequestMethod("GET");
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con.setRequestProperty("Accept", "application/vnd.api+json; charset=utf-8");
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int responseCode = con.getResponseCode();
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if (responseCode == HttpURLConnection.HTTP_OK) { // success
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BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
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String inputLine;
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while ((inputLine = in.readLine()) != null)
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response.append(inputLine);
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in.close();
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return ResponseEntity.status(HttpStatus.OK).body(response.toString());
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} else {
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return ResponseEntity.status(HttpStatus.FORBIDDEN).body("{'reason': 'Remote server responded with: " + responseCode + "'}");
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}
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} catch (IOException | URISyntaxException e) {
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return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("{'reason': 'Could not eu.eudat.logic.proxy to given host'}");
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}
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}
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}
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