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1 // urlwrite and urlread, a curl front-end for octave |
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2 /* |
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3 |
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4 Copyright (C) 2006 Alexander Barth |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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21 02110-1301, USA. |
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22 |
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23 */ |
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24 |
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25 // Author: Alexander Barth <abarth@marine.usf.edu> |
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26 // Adapted-By: jwe |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <string> |
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33 #include <fstream> |
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34 #include <iomanip> |
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35 |
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36 #include "oct-env.h" |
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37 |
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38 #include "defun-dld.h" |
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39 #include "error.h" |
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40 #include "oct-obj.h" |
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41 #include "ov-cell.h" |
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42 #include "pager.h" |
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43 |
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44 #if defined (HAVE_CURL) |
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45 |
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46 #include <curl/curl.h> |
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47 #include <curl/types.h> |
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48 #include <curl/easy.h> |
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49 |
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50 // Write callback function for curl. |
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51 |
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52 static int |
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53 write_data (void *buffer, size_t size, size_t nmemb, void *streamp) |
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54 { |
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55 // *stream is actually an ostream object. |
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56 std::ostream& stream = *(static_cast<std::ostream*> (streamp)); |
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57 stream.write (static_cast<const char*> (buffer), size*nmemb); |
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58 return (stream.fail () ? 0 : size * nmemb); |
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59 } |
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60 |
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61 // Form the query string based on param. |
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62 |
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63 static std::string |
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64 form_query_string (CURL *curl, const Cell& param) |
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65 { |
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66 std::ostringstream query; |
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67 |
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68 for (int i = 0; i < param.numel (); i += 2) |
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69 { |
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70 std::string name = param(i).string_value (); |
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71 std::string text = param(i+1).string_value (); |
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72 |
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73 // Encode strings. |
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74 char *enc_name = curl_easy_escape (curl, name.c_str (), name.length ()); |
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75 char *enc_text = curl_easy_escape (curl, text.c_str (), text.length ()); |
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76 |
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77 query << enc_name << "=" << enc_text; |
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78 |
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79 curl_free (enc_name); |
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80 curl_free (enc_text); |
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81 |
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82 if (i < param.numel()-1) |
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83 query << "&"; |
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84 } |
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85 |
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86 query.flush (); |
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87 |
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88 return query.str (); |
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89 } |
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90 |
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91 // curl front-end |
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92 |
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93 static CURLcode |
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94 urlget (const std::string& url, const std::string& method, |
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95 const Cell& param, std::ostream& stream) |
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96 { |
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97 CURL *curl; |
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98 |
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99 curl_global_init(CURL_GLOBAL_DEFAULT); |
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100 |
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101 curl = curl_easy_init(); |
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102 |
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103 if (! curl) |
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104 return CURLE_FAILED_INIT; |
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105 |
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106 // handle paramters of GET or POST request |
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107 |
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108 std::string query_string = form_query_string (curl,param); |
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109 //octave_stdout << "query_string " << query_string << std::endl; |
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110 |
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111 if (method == "get") |
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112 { |
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113 query_string = url + "?" + query_string; |
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114 curl_easy_setopt (curl, CURLOPT_URL, query_string.c_str ()); |
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115 } |
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116 else if (method == "post") |
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117 { |
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118 curl_easy_setopt (curl, CURLOPT_URL, url.c_str ()); |
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119 curl_easy_setopt (curl, CURLOPT_POSTFIELDS, query_string.c_str ()); |
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120 } |
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121 else |
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122 curl_easy_setopt (curl, CURLOPT_URL,url.c_str()); |
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123 |
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124 // Define our callback to get called when there's data to be written. |
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125 curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, write_data); |
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126 |
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127 // Set a pointer to our struct to pass to the callback. |
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128 curl_easy_setopt (curl, CURLOPT_WRITEDATA, static_cast<void*> (&stream)); |
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129 |
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130 // Follow redirects. |
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131 curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1); |
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132 |
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133 curl_easy_setopt (curl, CURLOPT_NOPROGRESS, false); |
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134 curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, url.c_str ()); |
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135 curl_easy_setopt (curl, CURLOPT_FAILONERROR, true); |
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136 |
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137 // Switch on full protocol/debug output |
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138 // curl_easy_setopt(curl, CURLOPT_VERBOSE, true); |
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139 |
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140 CURLcode res = curl_easy_perform (curl); |
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141 |
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142 // Always cleanup. |
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143 curl_easy_cleanup (curl); |
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144 |
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145 curl_global_cleanup (); |
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146 |
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147 return res; |
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148 } |
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149 |
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150 #endif |
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151 |
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152 DEFUN_DLD (urlwrite, args, nargout, |
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153 "-*- texinfo -*-\n\ |
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154 @deftypefn {Loadable Function} {} urlwrite (@var{URL}, @var{localfile})\n\ |
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155 @deftypefnx {Loadable Function} {@var{f} =} urlwrite (@var{url}, @var{localfile})\n\ |
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156 @deftypefnx {Loadable Function} {[@var{f}, @var{success}] =} urlwrite (@var{url}, @var{localfile})\n\ |
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157 @deftypefnx {Loadable Function} {[@var{f}, @var{success}, @var{message}] =} urlwrite (@var{url}, @var{localfile})\n\ |
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158 Download a remote file specified by its @var{URL} and save it as\n\ |
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159 @var{localfile}. For example,\n\ |
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160 \n\ |
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161 @example\n\ |
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162 urlwrite (\"ftp://ftp.octave.org/pub/octave/README\", \"README.txt\");\n\ |
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163 @end example\n\ |
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164 \n\ |
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165 The full path of the downloaded file is returned in @var{f}. The\n\ |
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166 variable @var{success} is 1 if the download was successful,\n\ |
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167 otherwise it is 0 in which case @var{message} contains an error\n\ |
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168 message. If no output argument is specified and if an error occurs,\n\ |
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169 then the error is signaled through Octave's error handling mechanism.\n\ |
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170 \n\ |
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171 This function uses libcurl. Curl supports, among others, the HTTP,\n\ |
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172 FTP and FILE protocols. Username and password may be specified in\n\ |
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173 the URL, for example:\n\ |
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174 \n\ |
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175 @example\n\ |
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176 urlwrite (\"http://username:password@@example.com/file.txt\",\n\ |
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177 \"file.txt\");\n\ |
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178 @end example\n\ |
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179 \n\ |
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180 GET and POST requests can be specified by @var{method} and @var{param}.\n\ |
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181 The parameter @var{method} is either @samp{get} or @samp{post}\n\ |
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182 and @var{param} is a cell array of parameter and value pairs.\n\ |
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183 For example:\n\ |
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184 \n\ |
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185 @example\n\ |
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186 urlwrite (\"http://www.google.com/search\", \"search.html\",\n\ |
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187 \"get\", @{\"query\", \"octave\"@});\n\ |
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188 @end example\n\ |
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189 @seealso{urlread}\n\ |
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190 @end deftypefn") |
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191 { |
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192 octave_value_list retval; |
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193 |
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194 #if defined (HAVE_CURL) |
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195 |
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196 int nargin = args.length (); |
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197 |
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198 // verify arguments |
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199 if (nargin != 2 && nargin != 4) |
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200 { |
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201 print_usage (); |
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202 return retval; |
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203 } |
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204 |
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205 std::string url = args(0).string_value(); |
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206 |
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207 if (error_state) |
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208 { |
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209 error ("urlwrite: url must be a character string"); |
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210 return retval; |
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211 } |
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212 |
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213 // name to store the file if download is succesful |
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214 std::string filename = args(1).string_value(); |
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215 |
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216 if (error_state) |
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217 { |
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218 error ("urlwrite: localfile must be a character string"); |
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219 return retval; |
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220 } |
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221 |
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222 std::string method; |
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223 Cell param; // empty cell array |
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224 |
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225 if (nargin == 4) |
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226 { |
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227 method = args(2).string_value(); |
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228 |
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229 if (error_state) |
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230 { |
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231 error ("urlwrite: method can only be \"get\" or \"post\""); |
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232 return retval; |
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233 } |
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234 |
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235 if (method != "get" && method != "post") |
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236 { |
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237 error ("urlwrite: method can only be \"get\" or \"post\""); |
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238 return retval; |
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239 } |
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240 |
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241 param = args(3).cell_value(); |
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242 |
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243 if (error_state) |
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244 { |
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245 error ("urlwrite: parameters for get and post requests must be given as a cell"); |
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246 return retval; |
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247 } |
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248 |
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249 |
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250 if (param.numel () % 2 == 1 ) |
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251 { |
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252 error ("urlwrite: number of elements in param must be even"); |
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253 return retval; |
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254 } |
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255 } |
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256 |
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257 std::ofstream ofile (filename.c_str(), std::ios::out | std::ios::binary); |
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258 |
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259 if (! ofile.is_open ()) |
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260 { |
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261 error ("urlwrite: unable to open file"); |
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262 return retval; |
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263 } |
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264 |
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265 CURLcode res = urlget (url, method, param, ofile); |
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266 |
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267 ofile.close (); |
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268 |
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269 if (nargout > 0) |
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270 { |
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271 retval(0) = octave_env::make_absolute (filename, octave_env::getcwd ()); |
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272 retval(1) = res == CURLE_OK; |
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273 retval(2) = std::string (res == CURLE_OK ? "" : curl_easy_strerror (res)); |
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274 } |
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275 |
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276 if (nargout < 2 && res != CURLE_OK) |
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277 error ("urlwrite: curl: %s", curl_easy_strerror (res)); |
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278 |
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279 #else |
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280 error ("urlwrite: not available in this version of Octave"); |
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281 #endif |
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282 |
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283 return retval; |
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284 } |
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285 |
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286 DEFUN_DLD (urlread, args, nargout, |
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287 "-*- texinfo -*-\n\ |
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288 @deftypefn {Loadable Function} {@var{s} =} urlread (@var{url})\n\ |
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289 @deftypefnx {Loadable Function} {[@var{s}, @var{success}] =} urlread (@var{url})\n\ |
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290 @deftypefnx {Loadable Function} {[@var{s}, @var{success}, @var{message}] =} urlread (@var{url})\n\ |
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291 @deftypefnx {Loadable Function} {[@dots{}] =} urlread (@var{url}, @var{method}, @var{param})\n\ |
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292 Download a remote file specified by its @var{URL} and return its content\n\ |
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293 in string @var{s}. For example,\n\ |
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294 \n\ |
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295 @example\n\ |
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296 s = urlread (\"ftp://ftp.octave.org/pub/octave/README\");\n\ |
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297 @end example\n\ |
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298 \n\ |
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299 The variable @var{success} is 1 if the download was successful,\n\ |
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300 otherwise it is 0 in which case @var{message} contains an error\n\ |
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301 message. If no output argument is specified and if an error occurs,\n\ |
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302 then the error is signaled through Octave's error handling mechanism.\n\ |
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303 \n\ |
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304 This function uses libcurl. Curl supports, among others, the HTTP,\n\ |
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305 FTP and FILE protocols. Username and password may be specified in the\n\ |
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306 URL. For example,\n\ |
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307 \n\ |
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308 @example\n\ |
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309 s = urlread (\"http://username:password@@example.com/file.txt\");\n\ |
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310 @end example\n\ |
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311 \n\ |
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312 GET and POST requests can be specified by @var{method} and @var{param}.\n\ |
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313 The parameter @var{method} is either @samp{get} or @samp{post}\n\ |
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314 and @var{param} is a cell array of parameter and value pairs.\n\ |
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315 For example,\n\ |
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316 \n\ |
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317 @example\n\ |
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318 s = urlread (\"http://www.google.com/search\", \"get\",\n\ |
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319 @{\"query\", \"octave\"@});\n\ |
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320 @end example\n\ |
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321 @seealso{urlwrite}\n\ |
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322 @end deftypefn") |
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323 { |
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324 // Octave's return value |
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325 octave_value_list retval; |
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326 |
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327 #if defined (HAVE_CURL) |
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328 |
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329 int nargin = args.length (); |
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330 |
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331 // verify arguments |
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332 if (nargin != 1 && nargin != 3) |
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333 { |
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334 print_usage (); |
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335 return retval; |
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336 } |
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337 |
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338 std::string url = args(0).string_value(); |
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339 |
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340 if (error_state) |
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341 { |
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342 error ("urlread: url must be a character string"); |
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343 return retval; |
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344 } |
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345 |
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346 std::string method; |
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347 Cell param; // empty cell array |
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348 |
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349 if (nargin == 3) |
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350 { |
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351 method = args(1).string_value(); |
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352 |
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353 if (error_state) |
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354 { |
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355 error ("urlread: method can only be \"get\" or \"post\""); |
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356 return retval; |
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357 } |
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358 |
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359 if (method != "get" && method != "post") |
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360 { |
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361 error ("urlread: method can only be \"get\" or \"post\""); |
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362 return retval; |
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363 } |
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364 |
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365 param = args(2).cell_value(); |
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366 |
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367 if (error_state) |
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368 { |
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369 error ("urlread: parameters for get and post requests must be given as a cell"); |
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370 return retval; |
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371 } |
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372 |
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373 if (param.numel () % 2 == 1 ) |
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374 { |
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375 error ("urlread: number of elements in param must be even"); |
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376 return retval; |
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377 } |
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378 } |
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379 |
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380 std::ostringstream buf; |
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381 |
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382 CURLcode res = urlget (url, method, param, buf); |
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383 |
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384 if (nargout > 0) |
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385 { |
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386 retval(0) = buf.str (); |
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387 retval(1) = res == CURLE_OK; |
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388 // Return empty string if no error occured. |
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389 retval(2) = std::string (res == CURLE_OK ? "" : curl_easy_strerror (res)); |
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390 } |
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391 |
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392 if (nargout < 2 && res != CURLE_OK) |
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393 error ("urlread: curl: %s", curl_easy_strerror (res)); |
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394 |
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395 #else |
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396 error ("urlread: not available in this version of Octave"); |
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397 #endif |
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398 |
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399 return retval; |
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400 } |
