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001package com.pusher.client.util;
002
003import java.io.BufferedReader;
004import java.io.DataOutputStream;
005import java.io.IOException;
006import java.io.InputStream;
007import java.io.InputStreamReader;
008import java.net.HttpURLConnection;
009import java.net.MalformedURLException;
010import java.net.URL;
011import java.net.URLEncoder;
012import java.util.HashMap;
013import java.util.Map;
014
015import javax.net.ssl.HttpsURLConnection;
016
017import com.pusher.client.AuthorizationFailureException;
018import com.pusher.client.Authorizer;
019
020/**
021 * Used to authenticate a {@link com.pusher.client.channel.PrivateChannel
022 * private} or {@link com.pusher.client.channel.PresenceChannel presence}
023 * channel subscription.
024 *
025 * <p>
026 * Makes an HTTP request to a defined HTTP endpoint. Expects an authentication
027 * token to be returned.
028 * </p>
029 *
030 * <p>
031 * For more information see the <a
032 * href="http://pusher.com/docs/authenticating_users">Authenticating Users
033 * documentation</a>.
034 */
035public class HttpAuthorizer implements Authorizer {
036
037    private final URL endPoint;
038    private Map<String, String> mHeaders = new HashMap<String, String>();
039    private Map<String, String> mQueryStringParameters = new HashMap<String, String>();
040    private final String ENCODING_CHARACTER_SET = "UTF-8";
041
042    /**
043     * Creates a new authorizer.
044     *
045     * @param endPoint
046     *            The endpoint to be called when authenticating.
047     */
048    public HttpAuthorizer(final String endPoint) {
049        try {
050            this.endPoint = new URL(endPoint);
051        }
052        catch (final MalformedURLException e) {
053            throw new IllegalArgumentException("Could not parse authentication end point into a valid URL", e);
054        }
055    }
056
057    /**
058     * Set additional headers to be sent as part of the request.
059     *
060     * @param headers A map of headers
061     */
062    public void setHeaders(final Map<String, String> headers) {
063        mHeaders = headers;
064    }
065
066    /**
067     * Identifies if the HTTP request will be sent over HTTPS.
068     * @return true if the endpoint protocol is 'https'
069     */
070    public Boolean isSSL() {
071        return endPoint.getProtocol().equals("https");
072    }
073
074    /**
075     * This methods is for passing extra parameters authentication that needs to
076     * be added to query string.
077     *
078     * @param queryStringParameters
079     *            the query parameters
080     */
081    public void setQueryStringParameters(final HashMap<String, String> queryStringParameters) {
082        mQueryStringParameters = queryStringParameters;
083    }
084
085    @Override
086    public String authorize(final String channelName, final String socketId) throws AuthorizationFailureException {
087
088        try {
089            final StringBuffer urlParameters = new StringBuffer();
090            urlParameters.append("channel_name=").append(URLEncoder.encode(channelName, ENCODING_CHARACTER_SET));
091            urlParameters.append("&socket_id=").append(URLEncoder.encode(socketId, ENCODING_CHARACTER_SET));
092
093            // Adding extra parameters supplied to be added to query string.
094            for (final String parameterName : mQueryStringParameters.keySet()) {
095                urlParameters.append("&").append(parameterName).append("=");
096                urlParameters.append(URLEncoder.encode(mQueryStringParameters.get(parameterName),
097                        ENCODING_CHARACTER_SET));
098            }
099
100            HttpURLConnection connection;
101            if (isSSL()) {
102                connection = (HttpsURLConnection)endPoint.openConnection();
103            }
104            else {
105                connection = (HttpURLConnection)endPoint.openConnection();
106            }
107            connection.setDoOutput(true);
108            connection.setDoInput(true);
109            connection.setInstanceFollowRedirects(false);
110            connection.setRequestMethod("POST");
111            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
112            connection.setRequestProperty("charset", "utf-8");
113            connection.setRequestProperty("Content-Length",
114                    "" + Integer.toString(urlParameters.toString().getBytes().length));
115
116            // Add in the user defined headers
117            for (final String headerName : mHeaders.keySet()) {
118                final String headerValue = mHeaders.get(headerName);
119                connection.setRequestProperty(headerName, headerValue);
120            }
121
122            connection.setUseCaches(false);
123
124            // Send request
125            final DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
126            wr.writeBytes(urlParameters.toString());
127            wr.flush();
128            wr.close();
129
130            // Read response
131            final InputStream is = connection.getInputStream();
132            final BufferedReader rd = new BufferedReader(new InputStreamReader(is));
133            String line;
134            final StringBuffer response = new StringBuffer();
135            while ((line = rd.readLine()) != null) {
136                response.append(line);
137            }
138            rd.close();
139
140            final int responseHttpStatus = connection.getResponseCode();
141            if (responseHttpStatus != 200) {
142                throw new AuthorizationFailureException(response.toString());
143            }
144
145            return response.toString();
146
147        }
148        catch (final IOException e) {
149            throw new AuthorizationFailureException(e);
150        }
151    }
152}