git.gag.com Git - fw/altos/blob - map-server/altos-map/AltosMap.java

   1 /*
   2  * Copyright © 2018 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 package altosmap;
  16
  17 import java.net.*;
  18 import java.io.*;
  19 import java.util.*;
  20 import java.text.*;
  21
  22 import org.altusmetrum.altoslib_13.*;
  23
  24 public class AltosMap {
  25
  26         public final static int port = 16717;
  27
  28         String  query_string;
  29         String  remote_addr;
  30
  31         public String reason_string(int code) {
  32                 switch (code) {
  33                 case 200:
  34                         return "OK";
  35                 case 400:
  36                         return "Bad Request";
  37                 case 403:
  38                         return "Forbidden";
  39                 case 404:
  40                         return "Not Found";
  41                 case 408:
  42                         return "Request Timeout";
  43                 default:
  44                         return "Failure";
  45                 }
  46         }
  47
  48         public void write_status(int status) {
  49                 System.out.printf("Status: %d %s\n", status, reason_string(status));
  50         }
  51
  52         public void write_type(String type) {
  53                 System.out.printf("Content-Type: %s\n", type);
  54         }
  55
  56         public void fail(int status, String reason) {
  57                 write_status(status);
  58                 write_type("text/html");
  59                 System.out.printf("<body>%s</body>\n", reason);
  60                 System.exit(1);
  61         }
  62
  63         public void process() {
  64                 query_string = System.getenv("QUERY_STRING");
  65
  66                 if (query_string == null)
  67                         fail(400, "Missing query string");
  68
  69                 remote_addr = System.getenv("REMOTE_ADDR");
  70
  71                 if (remote_addr == null)
  72                         fail(400, "Missing remote address");
  73
  74                 String[] queries = query_string.split("&");
  75
  76                 double  lon = AltosLib.MISSING;
  77                 double  lat = AltosLib.MISSING;
  78                 int     zoom = AltosLib.MISSING;
  79
  80                 try {
  81                         for (String query : queries) {
  82                                 String[] q = query.split("=");
  83                                 if (q.length >= 2) {
  84                                         String name = q[0];
  85                                         String value = q[1];
  86                                         if (name.equals("lon"))
  87                                                 lon = AltosParse.parse_double_net(value);
  88                                         else if (name.equals("lat"))
  89                                                 lat = AltosParse.parse_double_net(value);
  90                                         else if (name.equals("zoom"))
  91                                                 zoom = AltosParse.parse_int(value);
  92                                         else
  93                                                 fail(400, String.format("Extra query param \"%s\"", query));
  94                                 }
  95                         }
  96                 } catch (ParseException pe) {
  97                         fail(400, String.format("Invalid query: %s", pe.toString()));
  98                 }
  99
 100                 if (lon == AltosLib.MISSING)
 101                         fail(400, "Missing longitude");
 102                 if (lat == AltosLib.MISSING)
 103                         fail(400, "Missing latitude");
 104                 if (zoom == AltosLib.MISSING)
 105                         fail(400, "Missing zoom");
 106
 107                 try {
 108                         Socket  socket = new Socket(InetAddress.getLoopbackAddress(), port);
 109
 110                         AltosJson       request = new AltosJson();
 111
 112                         request.put("lat", lat);
 113                         request.put("lon", lon);
 114                         request.put("zoom", zoom);
 115                         request.put("remote_addr", remote_addr);
 116
 117                         Writer writer = new PrintWriter(socket.getOutputStream());
 118                         request.write(writer);
 119                         writer.flush();
 120
 121                         AltosJson       reply = AltosJson.fromInputStream(socket.getInputStream());
 122
 123                         int status = reply.get_int("status", 400);
 124
 125                         if (status != 200)
 126                                 fail(status, "Bad cache status");
 127
 128                         String filename = reply.get_string("filename", null);
 129                         try {
 130                                 File file = new File(filename);
 131                                 long length = file.length();
 132                                 FileInputStream in = new FileInputStream(file);
 133                                 String content_type = reply.get_string("content_type", null);
 134                                 System.out.printf("Content-Type: %s\n", content_type);
 135                                 System.out.printf("Content-Length: %d\n", file.length());
 136                                 byte[] buf = new byte[4096];
 137                                 int bytes_read;
 138                                 while ((bytes_read = in.read(buf)) > 0)
 139                                         System.out.write(buf);
 140                         } catch (IOException ie) {
 141                                 fail(404, String.format("IO Exception: %s", ie.toString()));
 142                         }
 143                 } catch (Exception e) {
 144                         fail(404, String.format("Exception %s", e.toString()));
 145                 }
 146         }
 147
 148         public AltosMap() {
 149         }
 150
 151         public static void main(final String[] args) {
 152
 153                 new AltosMap().process();
 154
 155         }
 156 }