prosody
1af5106a2c34
util/http.lua

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util/http.lua @ 9759:1af5106a2c34

util.http: Pre-generate urlencoding mappings (optimization) Function calls are more expensive than table lookups
author Kim Alvefur <zash@zash.se>
date Sun, 06 Jan 2019 10:39:33 +0100
parent 9504:cfbea3064aa9
child 9785:ff88b03c343f
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cc9d460aa779 util.http: New module for HTTP helper functions
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1 -- Prosody IM
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2 -- Copyright (C) 2013 Florian Zeitz
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7
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8 local format, char = string.format, string.char;
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9 local pairs, ipairs = pairs, ipairs;
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10 local t_insert, t_concat = table.insert, table.concat;
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11
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12 local url_codes = {};
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13 for i = 0, 255 do
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14 local c = char(i);
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15 local u = format("%%%02x", i);
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16 url_codes[c] = u;
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17 url_codes[u] = c;
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18 end
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19 local function urlencode(s)
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20 return s and (s:gsub("[^a-zA-Z0-9.~_-]", url_codes));
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21 end
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22 local function urldecode(s)
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23 return s and (s:gsub("%%%x%x", url_codes));
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24 end
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25
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26 local function _formencodepart(s)
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27 return s and (urlencode(s):gsub("%%20", "+"));
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28 end
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29
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30 local function formencode(form)
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31 local result = {};
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32 if form[1] then -- Array of ordered { name, value }
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33 for _, field in ipairs(form) do
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34 t_insert(result, _formencodepart(field.name).."=".._formencodepart(field.value));
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35 end
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36 else -- Unordered map of name -> value
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37 for name, value in pairs(form) do
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38 t_insert(result, _formencodepart(name).."=".._formencodepart(value));
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39 end
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40 end
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41 return t_concat(result, "&");
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42 end
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43
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44 local function formdecode(s)
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45 if not s:match("=") then return urldecode(s); end
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46 local r = {};
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47 for k, v in s:gmatch("([^=&]*)=([^&]*)") do
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48 k, v = k:gsub("%+", "%%20"), v:gsub("%+", "%%20");
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49 k, v = urldecode(k), urldecode(v);
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50 t_insert(r, { name = k, value = v });
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51 r[k] = v;
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52 end
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53 return r;
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54 end
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55
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56 local function contains_token(field, token)
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57 field = ","..field:gsub("[ \t]", ""):lower()..",";
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58 return field:find(","..token:lower()..",", 1, true) ~= nil;
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59 end
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60
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61 local function normalize_path(path, is_dir)
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62 if is_dir then
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63 if path:sub(-1,-1) ~= "/" then path = path.."/"; end
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64 else
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65 if path:sub(-1,-1) == "/" then path = path:sub(1, -2); end
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66 end
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67 if path:sub(1,1) ~= "/" then path = "/"..path; end
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68 return path;
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69 end
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70
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71 return {
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72 urlencode = urlencode, urldecode = urldecode;
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73 formencode = formencode, formdecode = formdecode;
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74 contains_token = contains_token;
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75 normalize_path = normalize_path;
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76 };