1 | # http.tcl -- |
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2 | # |
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3 | # Client-side HTTP for GET, POST, and HEAD commands. |
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4 | # These routines can be used in untrusted code that uses |
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5 | # the Safesock security policy. These procedures use a |
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6 | # callback interface to avoid using vwait, which is not |
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7 | # defined in the safe base. |
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8 | # |
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9 | # See the file "license.terms" for information on usage and |
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10 | # redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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11 | # |
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12 | # RCS: @(#) $Id: http.tcl,v 1.32.2.1 2000/05/31 01:28:57 sandeep Exp $ |
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13 | |
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14 | # Rough version history: |
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15 | # 1.0 Old http_get interface |
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16 | # 2.0 http:: namespace and http::geturl |
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17 | # 2.1 Added callbacks to handle arriving data, and timeouts |
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18 | # 2.2 Added ability to fetch into a channel |
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19 | # 2.3 Added SSL support, and ability to post from a channel |
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20 | # This version also cleans up error cases and eliminates the |
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21 | # "ioerror" status in favor of raising an error |
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22 | |
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23 | package provide http 2.3 |
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24 | |
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25 | namespace eval http { |
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26 | variable http |
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27 | array set http { |
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28 | -accept */* |
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29 | -proxyhost {} |
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30 | -proxyport {} |
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31 | -useragent {Tcl http client package 2.3} |
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32 | -proxyfilter http::ProxyRequired |
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33 | } |
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34 | |
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35 | variable formMap |
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36 | variable alphanumeric a-zA-Z0-9 |
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37 | variable c |
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38 | variable i 0 |
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39 | for {} {$i <= 256} {incr i} { |
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40 | set c [format %c $i] |
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41 | if {![string match \[$alphanumeric\] $c]} { |
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42 | set formMap($c) %[format %.2x $i] |
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43 | } |
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44 | } |
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45 | # These are handled specially |
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46 | array set formMap { |
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47 | " " + \n %0d%0a |
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48 | } |
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49 | |
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50 | variable urlTypes |
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51 | array set urlTypes { |
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52 | http {80 ::socket} |
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53 | } |
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54 | |
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55 | namespace export geturl config reset wait formatQuery register unregister |
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56 | # Useful, but not exported: data size status code |
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57 | } |
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58 | |
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59 | # http::register -- |
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60 | # |
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61 | # See documentaion for details. |
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62 | # |
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63 | # Arguments: |
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64 | # proto URL protocol prefix, e.g. https |
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65 | # port Default port for protocol |
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66 | # command Command to use to create socket |
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67 | # Results: |
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68 | # list of port and command that was registered. |
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69 | |
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70 | proc http::register {proto port command} { |
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71 | variable urlTypes |
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72 | set urlTypes($proto) [list $port $command] |
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73 | } |
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74 | |
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75 | # http::unregister -- |
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76 | # |
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77 | # Unregisters URL protocol handler |
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78 | # |
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79 | # Arguments: |
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80 | # proto URL protocol prefix, e.g. https |
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81 | # Results: |
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82 | # list of port and command that was unregistered. |
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83 | |
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84 | proc http::unregister {proto} { |
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85 | variable urlTypes |
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86 | if {![info exists urlTypes($proto)]} { |
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87 | return -code error "unsupported url type \"$proto\"" |
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88 | } |
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89 | set old $urlTypes($proto) |
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90 | unset urlTypes($proto) |
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91 | return $old |
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92 | } |
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93 | |
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94 | # http::config -- |
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95 | # |
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96 | # See documentaion for details. |
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97 | # |
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98 | # Arguments: |
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99 | # args Options parsed by the procedure. |
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100 | # Results: |
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101 | # TODO |
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102 | |
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103 | proc http::config {args} { |
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104 | variable http |
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105 | set options [lsort [array names http -*]] |
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106 | set usage [join $options ", "] |
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107 | if {[llength $args] == 0} { |
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108 | set result {} |
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109 | foreach name $options { |
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110 | lappend result $name $http($name) |
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111 | } |
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112 | return $result |
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113 | } |
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114 | regsub -all -- - $options {} options |
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115 | set pat ^-([join $options |])$ |
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116 | if {[llength $args] == 1} { |
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117 | set flag [lindex $args 0] |
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118 | if {[regexp -- $pat $flag]} { |
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119 | return $http($flag) |
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120 | } else { |
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121 | return -code error "Unknown option $flag, must be: $usage" |
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122 | } |
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123 | } else { |
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124 | foreach {flag value} $args { |
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125 | if {[regexp -- $pat $flag]} { |
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126 | set http($flag) $value |
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127 | } else { |
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128 | return -code error "Unknown option $flag, must be: $usage" |
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129 | } |
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130 | } |
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131 | } |
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132 | } |
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133 | |
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134 | # http::Finish -- |
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135 | # |
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136 | # Clean up the socket and eval close time callbacks |
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137 | # |
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138 | # Arguments: |
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139 | # token Connection token. |
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140 | # errormsg (optional) If set, forces status to error. |
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141 | # skipCB (optional) If set, don't call the -command callback. This |
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142 | # is useful when geturl wants to throw an exception instead |
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143 | # of calling the callback. That way, the same error isn't |
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144 | # reported to two places. |
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145 | # |
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146 | # Side Effects: |
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147 | # Closes the socket |
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148 | |
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149 | proc http::Finish { token {errormsg ""} {skipCB 0}} { |
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150 | variable $token |
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151 | upvar 0 $token state |
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152 | global errorInfo errorCode |
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153 | if {[string length $errormsg] != 0} { |
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154 | set state(error) [list $errormsg $errorInfo $errorCode] |
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155 | set state(status) error |
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156 | } |
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157 | catch {close $state(sock)} |
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158 | catch {after cancel $state(after)} |
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159 | if {[info exists state(-command)] && !$skipCB} { |
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160 | if {[catch {eval $state(-command) {$token}} err]} { |
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161 | if {[string length $errormsg] == 0} { |
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162 | set state(error) [list $err $errorInfo $errorCode] |
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163 | set state(status) error |
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164 | } |
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165 | } |
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166 | if {[info exist state(-command)]} { |
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167 | # Command callback may already have unset our state |
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168 | unset state(-command) |
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169 | } |
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170 | } |
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171 | } |
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172 | |
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173 | # http::reset -- |
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174 | # |
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175 | # See documentaion for details. |
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176 | # |
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177 | # Arguments: |
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178 | # token Connection token. |
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179 | # why Status info. |
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180 | # |
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181 | # Side Effects: |
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182 | # See Finish |
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183 | |
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184 | proc http::reset { token {why reset} } { |
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185 | variable $token |
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186 | upvar 0 $token state |
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187 | set state(status) $why |
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188 | catch {fileevent $state(sock) readable {}} |
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189 | catch {fileevent $state(sock) writable {}} |
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190 | Finish $token |
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191 | if {[info exists state(error)]} { |
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192 | set errorlist $state(error) |
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193 | unset state |
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194 | eval error $errorlist |
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195 | } |
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196 | } |
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197 | |
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198 | # http::geturl -- |
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199 | # |
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200 | # Establishes a connection to a remote url via http. |
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201 | # |
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202 | # Arguments: |
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203 | # url The http URL to goget. |
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204 | # args Option value pairs. Valid options include: |
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205 | # -blocksize, -validate, -headers, -timeout |
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206 | # Results: |
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207 | # Returns a token for this connection. |
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208 | # This token is the name of an array that the caller should |
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209 | # unset to garbage collect the state. |
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210 | |
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211 | proc http::geturl { url args } { |
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212 | variable http |
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213 | variable urlTypes |
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214 | |
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215 | # Initialize the state variable, an array. We'll return the |
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216 | # name of this array as the token for the transaction. |
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217 | |
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218 | if {![info exists http(uid)]} { |
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219 | set http(uid) 0 |
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220 | } |
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221 | set token [namespace current]::[incr http(uid)] |
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222 | variable $token |
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223 | upvar 0 $token state |
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224 | reset $token |
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225 | |
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226 | # Process command options. |
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227 | |
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228 | array set state { |
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229 | -blocksize 8192 |
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230 | -queryblocksize 8192 |
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231 | -validate 0 |
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232 | -headers {} |
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233 | -timeout 0 |
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234 | -type application/x-www-form-urlencoded |
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235 | -queryprogress {} |
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236 | state header |
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237 | meta {} |
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238 | currentsize 0 |
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239 | totalsize 0 |
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240 | querylength 0 |
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241 | queryoffset 0 |
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242 | type text/html |
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243 | body {} |
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244 | status "" |
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245 | http "" |
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246 | } |
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247 | set options {-blocksize -channel -command -handler -headers \ |
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248 | -progress -query -queryblocksize -querychannel -queryprogress\ |
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249 | -validate -timeout -type} |
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250 | set usage [join $options ", "] |
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251 | regsub -all -- - $options {} options |
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252 | set pat ^-([join $options |])$ |
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253 | foreach {flag value} $args { |
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254 | if {[regexp $pat $flag]} { |
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255 | # Validate numbers |
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256 | if {[info exists state($flag)] && \ |
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257 | [string is integer -strict $state($flag)] && \ |
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258 | ![string is integer -strict $value]} { |
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259 | unset $token |
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260 | return -code error "Bad value for $flag ($value), must be integer" |
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261 | } |
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262 | set state($flag) $value |
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263 | } else { |
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264 | unset $token |
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265 | return -code error "Unknown option $flag, can be: $usage" |
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266 | } |
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267 | } |
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268 | |
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269 | # Make sure -query and -querychannel aren't both specified |
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270 | |
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271 | set isQueryChannel [info exists state(-querychannel)] |
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272 | set isQuery [info exists state(-query)] |
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273 | if {$isQuery && $isQueryChannel} { |
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274 | unset $token |
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275 | return -code error "Can't combine -query and -querychannel options!" |
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276 | } |
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277 | |
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278 | # Validate URL, determine the server host and port, and check proxy case |
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279 | |
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280 | if {![regexp -nocase {^(([^:]*)://)?([^/:]+)(:([0-9]+))?(/.*)?$} $url \ |
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281 | x prefix proto host y port srvurl]} { |
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282 | unset $token |
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283 | return -code error "Unsupported URL: $url" |
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284 | } |
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285 | if {[string length $proto] == 0} { |
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286 | set proto http |
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287 | set url ${proto}://$url |
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288 | } |
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289 | if {![info exists urlTypes($proto)]} { |
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290 | unset $token |
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291 | return -code error "Unsupported URL type \"$proto\"" |
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292 | } |
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293 | set defport [lindex $urlTypes($proto) 0] |
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294 | set defcmd [lindex $urlTypes($proto) 1] |
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295 | |
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296 | if {[string length $port] == 0} { |
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297 | set port $defport |
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298 | } |
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299 | if {[string length $srvurl] == 0} { |
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300 | set srvurl / |
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301 | } |
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302 | if {[string length $proto] == 0} { |
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303 | set url http://$url |
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304 | } |
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305 | set state(url) $url |
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306 | if {![catch {$http(-proxyfilter) $host} proxy]} { |
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307 | set phost [lindex $proxy 0] |
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308 | set pport [lindex $proxy 1] |
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309 | } |
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310 | |
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311 | # If a timeout is specified we set up the after event |
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312 | # and arrange for an asynchronous socket connection. |
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313 | |
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314 | if {$state(-timeout) > 0} { |
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315 | set state(after) [after $state(-timeout) \ |
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316 | [list http::reset $token timeout]] |
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317 | set async -async |
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318 | } else { |
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319 | set async "" |
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320 | } |
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321 | |
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322 | # If we are using the proxy, we must pass in the full URL that |
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323 | # includes the server name. |
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324 | |
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325 | if {[info exists phost] && [string length $phost]} { |
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326 | set srvurl $url |
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327 | set conStat [catch {eval $defcmd $async {$phost $pport}} s] |
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328 | } else { |
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329 | set conStat [catch {eval $defcmd $async {$host $port}} s] |
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330 | } |
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331 | if {$conStat} { |
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332 | |
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333 | # something went wrong while trying to establish the connection |
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334 | # Clean up after events and such, but DON'T call the command callback |
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335 | # (if available) because we're going to throw an exception from here |
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336 | # instead. |
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337 | Finish $token "" 1 |
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338 | cleanup $token |
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339 | return -code error $s |
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340 | } |
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341 | set state(sock) $s |
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342 | |
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343 | # Wait for the connection to complete |
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344 | |
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345 | if {$state(-timeout) > 0} { |
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346 | fileevent $s writable [list http::Connect $token] |
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347 | http::wait $token |
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348 | |
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349 | if {[string equal $state(status) "error"]} { |
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350 | # something went wrong while trying to establish the connection |
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351 | # Clean up after events and such, but DON'T call the command |
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352 | # callback (if available) because we're going to throw an |
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353 | # exception from here instead. |
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354 | set err [lindex $state(error) 0] |
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355 | cleanup $token |
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356 | return -code error $err |
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357 | } elseif {![string equal $state(status) "connect"]} { |
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358 | # Likely to be connection timeout |
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359 | return $token |
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360 | } |
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361 | set state(status) "" |
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362 | } |
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363 | |
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364 | # Send data in cr-lf format, but accept any line terminators |
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365 | |
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366 | fconfigure $s -translation {auto crlf} -buffersize $state(-blocksize) |
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367 | |
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368 | # The following is disallowed in safe interpreters, but the socket |
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369 | # is already in non-blocking mode in that case. |
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370 | |
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371 | catch {fconfigure $s -blocking off} |
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372 | set how GET |
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373 | if {$isQuery} { |
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374 | set state(querylength) [string length $state(-query)] |
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375 | if {$state(querylength) > 0} { |
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376 | set how POST |
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377 | set contDone 0 |
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378 | } else { |
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379 | # there's no query data |
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380 | unset state(-query) |
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381 | set isQuery 0 |
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382 | } |
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383 | } elseif {$state(-validate)} { |
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384 | set how HEAD |
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385 | } elseif {$isQueryChannel} { |
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386 | set how POST |
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387 | # The query channel must be blocking for the async Write to |
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388 | # work properly. |
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389 | fconfigure $state(-querychannel) -blocking 1 -translation binary |
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390 | set contDone 0 |
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391 | } |
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392 | |
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393 | if {[catch { |
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394 | puts $s "$how $srvurl HTTP/1.0" |
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395 | puts $s "Accept: $http(-accept)" |
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396 | puts $s "Host: $host" |
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397 | puts $s "User-Agent: $http(-useragent)" |
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398 | foreach {key value} $state(-headers) { |
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399 | regsub -all \[\n\r\] $value {} value |
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400 | set key [string trim $key] |
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401 | if {[string equal $key "Content-Length"]} { |
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402 | set contDone 1 |
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403 | set state(querylength) $value |
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404 | } |
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405 | if {[string length $key]} { |
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406 | puts $s "$key: $value" |
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407 | } |
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408 | } |
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409 | if {$isQueryChannel && $state(querylength) == 0} { |
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410 | # Try to determine size of data in channel |
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411 | # If we cannot seek, the surrounding catch will trap us |
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412 | |
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413 | set start [tell $state(-querychannel)] |
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414 | seek $state(-querychannel) 0 end |
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415 | set state(querylength) \ |
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416 | [expr {[tell $state(-querychannel)] - $start}] |
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417 | seek $state(-querychannel) $start |
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418 | } |
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419 | |
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420 | # Flush the request header and set up the fileevent that will |
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421 | # either push the POST data or read the response. |
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422 | # |
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423 | # fileevent note: |
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424 | # |
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425 | # It is possible to have both the read and write fileevents active |
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426 | # at this point. The only scenario it seems to affect is a server |
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427 | # that closes the connection without reading the POST data. |
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428 | # (e.g., early versions TclHttpd in various error cases). |
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429 | # Depending on the platform, the client may or may not be able to |
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430 | # get the response from the server because of the error it will |
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431 | # get trying to write the post data. Having both fileevents active |
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432 | # changes the timing and the behavior, but no two platforms |
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433 | # (among Solaris, Linux, and NT) behave the same, and none |
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434 | # behave all that well in any case. Servers should always read thier |
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435 | # POST data if they expect the client to read their response. |
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436 | |
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437 | if {$isQuery || $isQueryChannel} { |
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438 | puts $s "Content-Type: $state(-type)" |
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439 | if {!$contDone} { |
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440 | puts $s "Content-Length: $state(querylength)" |
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441 | } |
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442 | puts $s "" |
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443 | fconfigure $s -translation {auto binary} |
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444 | fileevent $s writable [list http::Write $token] |
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445 | } else { |
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446 | puts $s "" |
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447 | flush $s |
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448 | fileevent $s readable [list http::Event $token] |
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449 | } |
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450 | |
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451 | if {! [info exists state(-command)]} { |
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452 | |
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453 | # geturl does EVERYTHING asynchronously, so if the user |
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454 | # calls it synchronously, we just do a wait here. |
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455 | |
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456 | wait $token |
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457 | if {[string equal $state(status) "error"]} { |
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458 | # Something went wrong, so throw the exception, and the |
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459 | # enclosing catch will do cleanup. |
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460 | return -code error [lindex $state(error) 0] |
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461 | } |
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462 | } |
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463 | } err]} { |
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464 | # The socket probably was never connected, |
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465 | # or the connection dropped later. |
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466 | |
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467 | # Clean up after events and such, but DON'T call the command callback |
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468 | # (if available) because we're going to throw an exception from here |
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469 | # instead. |
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470 | |
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471 | # if state(status) is error, it means someone's already called Finish |
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472 | # to do the above-described clean up. |
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473 | if {[string equal $state(status) "error"]} { |
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474 | Finish $token $err 1 |
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475 | } |
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476 | cleanup $token |
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477 | return -code error $err |
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478 | } |
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479 | |
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480 | return $token |
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481 | } |
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482 | |
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483 | # Data access functions: |
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484 | # Data - the URL data |
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485 | # Status - the transaction status: ok, reset, eof, timeout |
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486 | # Code - the HTTP transaction code, e.g., 200 |
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487 | # Size - the size of the URL data |
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488 | |
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489 | proc http::data {token} { |
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490 | variable $token |
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491 | upvar 0 $token state |
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492 | return $state(body) |
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493 | } |
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494 | proc http::status {token} { |
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495 | variable $token |
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496 | upvar 0 $token state |
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497 | return $state(status) |
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498 | } |
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499 | proc http::code {token} { |
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500 | variable $token |
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501 | upvar 0 $token state |
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502 | return $state(http) |
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503 | } |
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504 | proc http::ncode {token} { |
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505 | variable $token |
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506 | upvar 0 $token state |
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507 | if {[regexp {[0-9]{3}} $state(http) numeric_code]} { |
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508 | return $numeric_code |
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509 | } else { |
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510 | return $state(http) |
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511 | } |
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512 | } |
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513 | proc http::size {token} { |
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514 | variable $token |
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515 | upvar 0 $token state |
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516 | return $state(currentsize) |
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517 | } |
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518 | |
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519 | proc http::error {token} { |
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520 | variable $token |
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521 | upvar 0 $token state |
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522 | if {[info exists state(error)]} { |
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523 | return $state(error) |
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524 | } |
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525 | return "" |
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526 | } |
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527 | |
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528 | # http::cleanup |
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529 | # |
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530 | # Garbage collect the state associated with a transaction |
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531 | # |
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532 | # Arguments |
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533 | # token The token returned from http::geturl |
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534 | # |
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535 | # Side Effects |
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536 | # unsets the state array |
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537 | |
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538 | proc http::cleanup {token} { |
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539 | variable $token |
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540 | upvar 0 $token state |
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541 | if {[info exist state]} { |
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542 | unset state |
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543 | } |
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544 | } |
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545 | |
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546 | # http::Connect |
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547 | # |
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548 | # This callback is made when an asyncronous connection completes. |
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549 | # |
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550 | # Arguments |
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551 | # token The token returned from http::geturl |
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552 | # |
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553 | # Side Effects |
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554 | # Sets the status of the connection, which unblocks |
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555 | # the waiting geturl call |
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556 | |
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557 | proc http::Connect {token} { |
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558 | variable $token |
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559 | upvar 0 $token state |
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560 | global errorInfo errorCode |
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561 | if {[eof $state(sock)] || |
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562 | [string length [fconfigure $state(sock) -error]]} { |
---|
563 | Finish $token "connect failed [fconfigure $state(sock) -error]" 1 |
---|
564 | } else { |
---|
565 | set state(status) connect |
---|
566 | fileevent $state(sock) writable {} |
---|
567 | } |
---|
568 | return |
---|
569 | } |
---|
570 | |
---|
571 | # http::Write |
---|
572 | # |
---|
573 | # Write POST query data to the socket |
---|
574 | # |
---|
575 | # Arguments |
---|
576 | # token The token for the connection |
---|
577 | # |
---|
578 | # Side Effects |
---|
579 | # Write the socket and handle callbacks. |
---|
580 | |
---|
581 | proc http::Write {token} { |
---|
582 | variable $token |
---|
583 | upvar 0 $token state |
---|
584 | set s $state(sock) |
---|
585 | |
---|
586 | # Output a block. Tcl will buffer this if the socket blocks |
---|
587 | |
---|
588 | set done 0 |
---|
589 | if {[catch { |
---|
590 | |
---|
591 | # Catch I/O errors on dead sockets |
---|
592 | |
---|
593 | if {[info exists state(-query)]} { |
---|
594 | |
---|
595 | # Chop up large query strings so queryprogress callback |
---|
596 | # can give smooth feedback |
---|
597 | |
---|
598 | puts -nonewline $s \ |
---|
599 | [string range $state(-query) $state(queryoffset) \ |
---|
600 | [expr {$state(queryoffset) + $state(-queryblocksize) - 1}]] |
---|
601 | incr state(queryoffset) $state(-queryblocksize) |
---|
602 | if {$state(queryoffset) >= $state(querylength)} { |
---|
603 | set state(queryoffset) $state(querylength) |
---|
604 | set done 1 |
---|
605 | } |
---|
606 | } else { |
---|
607 | |
---|
608 | # Copy blocks from the query channel |
---|
609 | |
---|
610 | set outStr [read $state(-querychannel) $state(-queryblocksize)] |
---|
611 | puts -nonewline $s $outStr |
---|
612 | incr state(queryoffset) [string length $outStr] |
---|
613 | if {[eof $state(-querychannel)]} { |
---|
614 | set done 1 |
---|
615 | } |
---|
616 | } |
---|
617 | } err]} { |
---|
618 | # Do not call Finish here, but instead let the read half of |
---|
619 | # the socket process whatever server reply there is to get. |
---|
620 | |
---|
621 | set state(posterror) $err |
---|
622 | set done 1 |
---|
623 | } |
---|
624 | if {$done} { |
---|
625 | catch {flush $s} |
---|
626 | fileevent $s writable {} |
---|
627 | fileevent $s readable [list http::Event $token] |
---|
628 | } |
---|
629 | |
---|
630 | # Callback to the client after we've completely handled everything |
---|
631 | |
---|
632 | if {[string length $state(-queryprogress)]} { |
---|
633 | eval $state(-queryprogress) [list $token $state(querylength)\ |
---|
634 | $state(queryoffset)] |
---|
635 | } |
---|
636 | } |
---|
637 | |
---|
638 | # http::Event |
---|
639 | # |
---|
640 | # Handle input on the socket |
---|
641 | # |
---|
642 | # Arguments |
---|
643 | # token The token returned from http::geturl |
---|
644 | # |
---|
645 | # Side Effects |
---|
646 | # Read the socket and handle callbacks. |
---|
647 | |
---|
648 | proc http::Event {token} { |
---|
649 | variable $token |
---|
650 | upvar 0 $token state |
---|
651 | set s $state(sock) |
---|
652 | |
---|
653 | if {[eof $s]} { |
---|
654 | Eof $token |
---|
655 | return |
---|
656 | } |
---|
657 | if {[string equal $state(state) "header"]} { |
---|
658 | if {[catch {gets $s line} n]} { |
---|
659 | Finish $token $n |
---|
660 | } elseif {$n == 0} { |
---|
661 | set state(state) body |
---|
662 | if {![regexp -nocase ^text $state(type)]} { |
---|
663 | # Turn off conversions for non-text data |
---|
664 | fconfigure $s -translation binary |
---|
665 | if {[info exists state(-channel)]} { |
---|
666 | fconfigure $state(-channel) -translation binary |
---|
667 | } |
---|
668 | } |
---|
669 | if {[info exists state(-channel)] && |
---|
670 | ![info exists state(-handler)]} { |
---|
671 | # Initiate a sequence of background fcopies |
---|
672 | fileevent $s readable {} |
---|
673 | CopyStart $s $token |
---|
674 | } |
---|
675 | } elseif {$n > 0} { |
---|
676 | if {[regexp -nocase {^content-type:(.+)$} $line x type]} { |
---|
677 | set state(type) [string trim $type] |
---|
678 | } |
---|
679 | if {[regexp -nocase {^content-length:(.+)$} $line x length]} { |
---|
680 | set state(totalsize) [string trim $length] |
---|
681 | } |
---|
682 | if {[regexp -nocase {^([^:]+):(.+)$} $line x key value]} { |
---|
683 | lappend state(meta) $key [string trim $value] |
---|
684 | } elseif {[regexp ^HTTP $line]} { |
---|
685 | set state(http) $line |
---|
686 | } |
---|
687 | } |
---|
688 | } else { |
---|
689 | if {[catch { |
---|
690 | if {[info exists state(-handler)]} { |
---|
691 | set n [eval $state(-handler) {$s $token}] |
---|
692 | } else { |
---|
693 | set block [read $s $state(-blocksize)] |
---|
694 | set n [string length $block] |
---|
695 | if {$n >= 0} { |
---|
696 | append state(body) $block |
---|
697 | } |
---|
698 | } |
---|
699 | if {$n >= 0} { |
---|
700 | incr state(currentsize) $n |
---|
701 | } |
---|
702 | } err]} { |
---|
703 | Finish $token $err |
---|
704 | } else { |
---|
705 | if {[info exists state(-progress)]} { |
---|
706 | eval $state(-progress) {$token $state(totalsize) $state(currentsize)} |
---|
707 | } |
---|
708 | } |
---|
709 | } |
---|
710 | } |
---|
711 | |
---|
712 | # http::CopyStart |
---|
713 | # |
---|
714 | # Error handling wrapper around fcopy |
---|
715 | # |
---|
716 | # Arguments |
---|
717 | # s The socket to copy from |
---|
718 | # token The token returned from http::geturl |
---|
719 | # |
---|
720 | # Side Effects |
---|
721 | # This closes the connection upon error |
---|
722 | |
---|
723 | proc http::CopyStart {s token} { |
---|
724 | variable $token |
---|
725 | upvar 0 $token state |
---|
726 | if {[catch { |
---|
727 | fcopy $s $state(-channel) -size $state(-blocksize) -command \ |
---|
728 | [list http::CopyDone $token] |
---|
729 | } err]} { |
---|
730 | Finish $token $err |
---|
731 | } |
---|
732 | } |
---|
733 | |
---|
734 | # http::CopyDone |
---|
735 | # |
---|
736 | # fcopy completion callback |
---|
737 | # |
---|
738 | # Arguments |
---|
739 | # token The token returned from http::geturl |
---|
740 | # count The amount transfered |
---|
741 | # |
---|
742 | # Side Effects |
---|
743 | # Invokes callbacks |
---|
744 | |
---|
745 | proc http::CopyDone {token count {error {}}} { |
---|
746 | variable $token |
---|
747 | upvar 0 $token state |
---|
748 | set s $state(sock) |
---|
749 | incr state(currentsize) $count |
---|
750 | if {[info exists state(-progress)]} { |
---|
751 | eval $state(-progress) {$token $state(totalsize) $state(currentsize)} |
---|
752 | } |
---|
753 | # At this point the token may have been reset |
---|
754 | if {[string length $error]} { |
---|
755 | Finish $token $error |
---|
756 | } elseif {[catch {eof $s} iseof] || $iseof} { |
---|
757 | Eof $token |
---|
758 | } else { |
---|
759 | CopyStart $s $token |
---|
760 | } |
---|
761 | } |
---|
762 | |
---|
763 | # http::Eof |
---|
764 | # |
---|
765 | # Handle eof on the socket |
---|
766 | # |
---|
767 | # Arguments |
---|
768 | # token The token returned from http::geturl |
---|
769 | # |
---|
770 | # Side Effects |
---|
771 | # Clean up the socket |
---|
772 | |
---|
773 | proc http::Eof {token} { |
---|
774 | variable $token |
---|
775 | upvar 0 $token state |
---|
776 | if {[string equal $state(state) "header"]} { |
---|
777 | # Premature eof |
---|
778 | set state(status) eof |
---|
779 | } else { |
---|
780 | set state(status) ok |
---|
781 | } |
---|
782 | set state(state) eof |
---|
783 | Finish $token |
---|
784 | } |
---|
785 | |
---|
786 | # http::wait -- |
---|
787 | # |
---|
788 | # See documentaion for details. |
---|
789 | # |
---|
790 | # Arguments: |
---|
791 | # token Connection token. |
---|
792 | # |
---|
793 | # Results: |
---|
794 | # The status after the wait. |
---|
795 | |
---|
796 | proc http::wait {token} { |
---|
797 | variable $token |
---|
798 | upvar 0 $token state |
---|
799 | |
---|
800 | if {![info exists state(status)] || [string length $state(status)] == 0} { |
---|
801 | # We must wait on the original variable name, not the upvar alias |
---|
802 | vwait $token\(status) |
---|
803 | } |
---|
804 | |
---|
805 | return $state(status) |
---|
806 | } |
---|
807 | |
---|
808 | # http::formatQuery -- |
---|
809 | # |
---|
810 | # See documentaion for details. |
---|
811 | # Call http::formatQuery with an even number of arguments, where |
---|
812 | # the first is a name, the second is a value, the third is another |
---|
813 | # name, and so on. |
---|
814 | # |
---|
815 | # Arguments: |
---|
816 | # args A list of name-value pairs. |
---|
817 | # |
---|
818 | # Results: |
---|
819 | # TODO |
---|
820 | |
---|
821 | proc http::formatQuery {args} { |
---|
822 | set result "" |
---|
823 | set sep "" |
---|
824 | foreach i $args { |
---|
825 | append result $sep [mapReply $i] |
---|
826 | if {[string compare $sep "="]} { |
---|
827 | set sep = |
---|
828 | } else { |
---|
829 | set sep & |
---|
830 | } |
---|
831 | } |
---|
832 | return $result |
---|
833 | } |
---|
834 | |
---|
835 | # http::mapReply -- |
---|
836 | # |
---|
837 | # Do x-www-urlencoded character mapping |
---|
838 | # |
---|
839 | # Arguments: |
---|
840 | # string The string the needs to be encoded |
---|
841 | # |
---|
842 | # Results: |
---|
843 | # The encoded string |
---|
844 | |
---|
845 | proc http::mapReply {string} { |
---|
846 | variable formMap |
---|
847 | |
---|
848 | # The spec says: "non-alphanumeric characters are replaced by '%HH'" |
---|
849 | # 1 leave alphanumerics characters alone |
---|
850 | # 2 Convert every other character to an array lookup |
---|
851 | # 3 Escape constructs that are "special" to the tcl parser |
---|
852 | # 4 "subst" the result, doing all the array substitutions |
---|
853 | |
---|
854 | set alphanumeric a-zA-Z0-9 |
---|
855 | regsub -all \[^$alphanumeric\] $string {$formMap(&)} string |
---|
856 | regsub -all \n $string {\\n} string |
---|
857 | regsub -all \t $string {\\t} string |
---|
858 | regsub -all {[][{})\\]\)} $string {\\&} string |
---|
859 | return [subst $string] |
---|
860 | } |
---|
861 | |
---|
862 | # http::ProxyRequired -- |
---|
863 | # Default proxy filter. |
---|
864 | # |
---|
865 | # Arguments: |
---|
866 | # host The destination host |
---|
867 | # |
---|
868 | # Results: |
---|
869 | # The current proxy settings |
---|
870 | |
---|
871 | proc http::ProxyRequired {host} { |
---|
872 | variable http |
---|
873 | if {[info exists http(-proxyhost)] && [string length $http(-proxyhost)]} { |
---|
874 | if {![info exists http(-proxyport)] || ![string length $http(-proxyport)]} { |
---|
875 | set http(-proxyport) 8080 |
---|
876 | } |
---|
877 | return [list $http(-proxyhost) $http(-proxyport)] |
---|
878 | } else { |
---|
879 | return {} |
---|
880 | } |
---|
881 | } |
---|