prosody
98f9dca3eb94
util/httpstream.lua

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util/httpstream.lua @ 3562:98f9dca3eb94

util.httpstream: Move HTTP header parsing into its own function.
author Waqas Hussain <waqas20@gmail.com>
date Fri, 05 Nov 2010 02:09:56 +0500
parent 3496:9408d1e10e17
child 3563:544d9d2e3046
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1
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2 local coroutine = coroutine;
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3 local tonumber = tonumber;
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4
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5 local deadroutine = coroutine.create(function() end);
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6 coroutine.resume(deadroutine);
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7
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8 module("httpstream")
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9
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10 local function parser(data, success_cb)
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11 local function readline()
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12 local pos = data:find("\r\n", nil, true);
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13 while not pos do
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14 data = data..coroutine.yield();
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15 pos = data:find("\r\n", nil, true);
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16 end
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17 local r = data:sub(1, pos-1);
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18 data = data:sub(pos+2);
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19 return r;
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20 end
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21 local function readlength(n)
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22 while #data < n do
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23 data = data..coroutine.yield();
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24 end
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25 local r = data:sub(1, n);
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26 data = data:sub(n + 1);
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27 return r;
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28 end
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29 local function readheaders()
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30 local headers = {}; -- read headers
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31 while true do
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32 local line = readline();
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33 if line == "" then break; end -- headers done
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34 local key, val = line:match("^([^%s:]+): *(.*)$");
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35 if not key then coroutine.yield("invalid-header-line"); end -- TODO handle multi-line and invalid headers
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36 key = key:lower();
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37 headers[key] = headers[key] and headers[key]..","..val or val;
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38 end
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39 end
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40
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41 while true do
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42 -- read status line
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43 local status_line = readline();
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44 local method, path, httpversion = status_line:match("^(%S+)%s+(%S+)%s+HTTP/(%S+)$");
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45 if not method then coroutine.yield("invalid-status-line"); end
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46 -- TODO parse url
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47 local headers = readheaders();
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48
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49 -- read body
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50 local len = tonumber(headers["content-length"]);
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51 len = len or 0; -- TODO check for invalid len
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52 local body = readlength(len);
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53
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54 success_cb({
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55 method = method;
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56 path = path;
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57 httpversion = httpversion;
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58 headers = headers;
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59 body = body;
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60 });
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61 end
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62 end
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63
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64 function new(success_cb, error_cb)
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65 local co = coroutine.create(parser);
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66 return {
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67 feed = function(self, data)
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68 if not data then
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69 co = deadroutine;
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70 return error_cb();
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71 end
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72 local success, result = coroutine.resume(co, data, success_cb);
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73 if result then
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74 co = deadroutine;
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75 return error_cb(result);
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76 end
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77 end;
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78 };
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79 end
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80
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81 return _M;