prosody
0f185563a4e4
util/httpstream.lua

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util/httpstream.lua @ 3494:0f185563a4e4

util.httpstream: Initial commit of the new HTTP parser.
author Waqas Hussain <waqas20@gmail.com>
date Sat, 04 Sep 2010 17:44:13 +0500
child 3495:bd7699a6d536
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3493:f2b6115b531b 3494:0f185563a4e4
1
2 local setmetatable = setmetatable;
3 local coroutine = coroutine;
4 local tonumber = tonumber;
5
6 local print = print;
7 local error = error;
8 local ser = require "util.serialization".serialize;
9
10 local deadroutine = coroutine.create(function() end);
11 coroutine.resume(deadroutine);
12
13 module("httpstream")
14
15 local function parser(data, success_cb)
16 local function readline()
17 if not data then coroutine.yield("Unexpected EOF"); end
18 local pos, line = (data:find("\r\n", nil, true));
19 if not pos then
20 local newdata = coroutine.yield();
21 if not newdata then data = nil; coroutine.yield("Unexpected EOF"); end
22 data = data..newdata;
23 return readline();
24 end
25 line, data = data:sub(1, pos-1), data:sub(pos+2);
26 return line;
27 end
28 local function readlength(n)
29 if not data then coroutine.yield("Unexpected EOF"); end
30 while #data < n do
31 local newdata = coroutine.yield();
32 if not newdata then data = nil; coroutine.yield("Unexpected EOF"); end
33 data = data..newdata;
34 end
35 local r = data:sub(1, n);
36 data = data:sub(n + 1);
37 return r;
38 end
39
40 while true do
41 -- read status line
42 local status_line = readline();
43 local method, path, httpversion = status_line:match("^(%S+)%s+(%S+)%s+HTTP/(%S+)$");
44 if not method then coroutine.yield("invalid-status-line"); end
45 -- TODO parse url
46
47 local headers = {}; -- read headers
48 while true do
49 local line = readline();
50 if line == "" then break; end -- headers done
51 local key, val = line:match("^([^%s:]+): *(.*)$");
52 if not key then coroutine.yield("invalid-header-line"); end -- TODO handle multi-line and invalid headers
53 key = key:lower();
54 headers[key] = headers[key] and headers[key]..","..val or val;
55 end
56
57 -- read body
58 local len = tonumber(headers["content-length"]);
59 len = len or 0; -- TODO check for invalid len
60 local body = readlength(len);
61
62 success_cb({
63 method = method;
64 path = path;
65 httpversion = httpversion;
66 headers = headers;
67 body = body;
68 });
69 end
70 end
71
72 function new(success_cb, error_cb)
73 local co = coroutine.create(parser);
74 return {
75 feed = function(self, data)
76 local success, result = coroutine.resume(co, data, success_cb);
77 if result then
78 if result.method then
79 success_cb(result);
80 else -- error
81 error_cb(result);
82 co = deadroutine;
83 end
84 end
85 end;
86 };
87 end
88
89 return _M;