1 | define(['dojo/main', 'dojo/io/iframe', 'dojox/data/dom', 'dojo/_base/xhr', 'dojo/_base/url'], function(dojo, iframe, dom){ |
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2 | dojo.getObject("io.proxy.xip", true, dojox); |
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3 | |
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4 | dojox.io.proxy.xip = { |
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5 | // summary: |
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6 | // Object that implements the iframe handling for XMLHttpRequest |
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7 | // IFrame Proxying. |
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8 | // |
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9 | // Do not use this object directly. See the Dojo Book page |
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10 | // on XMLHttpRequest IFrame Proxying: |
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11 | // http://dojotoolkit.org/book/dojo-book-0-4/part-5-connecting-pieces/i-o/cross-domain-xmlhttprequest-using-iframe-proxy |
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12 | // Usage of XHR IFrame Proxying does not work from local disk in Safari. |
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13 | |
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14 | /* |
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15 | This code is really focused on just sending one complete request to the server, and |
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16 | receiving one complete response per iframe. The code does not expect to reuse iframes for multiple XHR request/response |
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17 | sequences. This might be reworked later if performance indicates a need for it. |
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18 | |
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19 | xip fragment identifier/hash values have the form: |
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20 | #id:cmd:realEncodedMessage |
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21 | |
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22 | id: some ID that should be unique among message fragments. No inherent meaning, |
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23 | just something to make sure the hash value is unique so the message |
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24 | receiver knows a new message is available. |
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25 | |
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26 | cmd: command to the receiver. Valid values are: |
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27 | - init: message used to init the frame. Sent as the first URL when loading |
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28 | the page. Contains some config parameters. |
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29 | - loaded: the remote frame is loaded. Only sent from xip_client.html to this module. |
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30 | - ok: the message that this page sent was received OK. The next message may |
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31 | now be sent. |
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32 | - start: the start message of a block of messages (a complete message may |
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33 | need to be segmented into many messages to get around the limitiations |
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34 | of the size of an URL that a browser accepts. |
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35 | - part: indicates this is a part of a message. |
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36 | - end: the end message of a block of messages. The message can now be acted upon. |
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37 | If the message is small enough that it doesn't need to be segmented, then |
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38 | just one hash value message can be sent with "end" as the command. |
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39 | |
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40 | To reassemble a segmented message, the realEncodedMessage parts just have to be concatenated |
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41 | together. |
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42 | */ |
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43 | |
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44 | xipClientUrl: ((dojo.config || djConfig)["xipClientUrl"]) || dojo.moduleUrl("dojox.io.proxy", "xip_client.html").toString(), |
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45 | |
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46 | |
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47 | //MSIE has the lowest limit for URLs with fragment identifiers, |
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48 | //at around 4K. Choosing a slightly smaller number for good measure. |
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49 | urlLimit: 4000, |
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50 | |
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51 | _callbackName: (dojox._scopeName || "dojox") + ".io.proxy.xip.fragmentReceived", |
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52 | _state: {}, |
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53 | _stateIdCounter: 0, |
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54 | _isWebKit: navigator.userAgent.indexOf("WebKit") != -1, |
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55 | |
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56 | |
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57 | send: function(/*Object*/facade){ |
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58 | // summary: |
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59 | // starts the xdomain request using the provided facade. |
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60 | // This method first does some init work, then delegates to _realSend. |
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61 | |
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62 | var url = this.xipClientUrl; |
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63 | //Make sure we are not dealing with javascript urls, just to be safe. |
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64 | if(url.split(":")[0].match(/javascript/i) || facade._ifpServerUrl.split(":")[0].match(/javascript/i)){ |
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65 | return null; |
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66 | } |
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67 | |
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68 | //Make xip_client a full URL. |
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69 | var colonIndex = url.indexOf(":"); |
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70 | var slashIndex = url.indexOf("/"); |
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71 | if(colonIndex == -1 || slashIndex < colonIndex){ |
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72 | //No colon or we are starting with a / before a colon, so we need to make a full URL. |
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73 | var loc = window.location.href; |
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74 | if(slashIndex == 0){ |
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75 | //Have a full path, just need the domain. |
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76 | url = loc.substring(0, loc.indexOf("/", 9)) + url; //Using 9 to get past http(s):// |
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77 | }else{ |
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78 | url = loc.substring(0, (loc.lastIndexOf("/") + 1)) + url; |
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79 | } |
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80 | } |
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81 | this.fullXipClientUrl = url; |
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82 | |
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83 | //Set up an HTML5 messaging listener if postMessage exists. |
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84 | //As of this writing, this is only useful to get Opera 9.25+ to work. |
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85 | if(typeof document.postMessage != "undefined"){ |
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86 | document.addEventListener("message", dojo.hitch(this, this.fragmentReceivedEvent), false); |
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87 | } |
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88 | |
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89 | //Now that we did first time init, always use the realSend method. |
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90 | this.send = this._realSend; |
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91 | return this._realSend(facade); //Object |
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92 | }, |
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93 | |
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94 | _realSend: function(facade){ |
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95 | // summary: |
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96 | // starts the actual xdomain request using the provided facade. |
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97 | var stateId = "XhrIframeProxy" + (this._stateIdCounter++); |
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98 | facade._stateId = stateId; |
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99 | |
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100 | var frameUrl = facade._ifpServerUrl + "#0:init:id=" + stateId + "&client=" |
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101 | + encodeURIComponent(this.fullXipClientUrl) + "&callback=" + encodeURIComponent(this._callbackName); |
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102 | |
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103 | this._state[stateId] = { |
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104 | facade: facade, |
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105 | stateId: stateId, |
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106 | clientFrame: iframe.create(stateId, "", frameUrl), |
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107 | isSending: false, |
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108 | serverUrl: facade._ifpServerUrl, |
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109 | requestData: null, |
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110 | responseMessage: "", |
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111 | requestParts: [], |
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112 | idCounter: 1, |
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113 | partIndex: 0, |
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114 | serverWindow: null |
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115 | }; |
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116 | |
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117 | return stateId; //Object |
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118 | }, |
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119 | |
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120 | receive: function(/*String*/stateId, /*String*/urlEncodedData){ |
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121 | /* urlEncodedData should have the following params: |
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122 | - responseHeaders |
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123 | - status |
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124 | - statusText |
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125 | - responseText |
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126 | */ |
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127 | //Decode response data. |
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128 | var response = {}; |
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129 | var nvPairs = urlEncodedData.split("&"); |
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130 | for(var i = 0; i < nvPairs.length; i++){ |
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131 | if(nvPairs[i]){ |
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132 | var nameValue = nvPairs[i].split("="); |
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133 | response[decodeURIComponent(nameValue[0])] = decodeURIComponent(nameValue[1]); |
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134 | } |
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135 | } |
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136 | |
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137 | //Set data on facade object. |
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138 | var state = this._state[stateId]; |
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139 | var facade = state.facade; |
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140 | |
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141 | facade._setResponseHeaders(response.responseHeaders); |
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142 | if(response.status == 0 || response.status){ |
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143 | facade.status = parseInt(response.status, 10); |
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144 | } |
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145 | if(response.statusText){ |
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146 | facade.statusText = response.statusText; |
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147 | } |
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148 | if(response.responseText){ |
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149 | facade.responseText = response.responseText; |
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150 | |
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151 | //Fix responseXML. |
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152 | var contentType = facade.getResponseHeader("Content-Type"); |
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153 | if(contentType){ |
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154 | var mimeType = contentType.split(";")[0]; |
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155 | if(mimeType.indexOf("application/xml") == 0 || mimeType.indexOf("text/xml") == 0){ |
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156 | facade.responseXML = dom.createDocument(response.responseText, contentType); |
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157 | } |
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158 | } |
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159 | } |
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160 | facade.readyState = 4; |
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161 | |
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162 | this.destroyState(stateId); |
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163 | }, |
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164 | |
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165 | frameLoaded: function(/*String*/stateId){ |
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166 | var state = this._state[stateId]; |
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167 | var facade = state.facade; |
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168 | |
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169 | var reqHeaders = []; |
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170 | for(var param in facade._requestHeaders){ |
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171 | reqHeaders.push(param + ": " + facade._requestHeaders[param]); |
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172 | } |
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173 | |
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174 | var requestData = { |
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175 | uri: facade._uri |
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176 | }; |
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177 | if(reqHeaders.length > 0){ |
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178 | requestData.requestHeaders = reqHeaders.join("\r\n"); |
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179 | } |
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180 | if(facade._method){ |
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181 | requestData.method = facade._method; |
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182 | } |
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183 | if(facade._bodyData){ |
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184 | requestData.data = facade._bodyData; |
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185 | } |
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186 | |
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187 | this.sendRequest(stateId, dojo.objectToQuery(requestData)); |
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188 | }, |
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189 | |
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190 | destroyState: function(/*String*/stateId){ |
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191 | var state = this._state[stateId]; |
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192 | if(state){ |
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193 | delete this._state[stateId]; |
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194 | var parentNode = state.clientFrame.parentNode; |
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195 | parentNode.removeChild(state.clientFrame); |
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196 | state.clientFrame = null; |
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197 | state = null; |
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198 | } |
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199 | }, |
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200 | |
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201 | createFacade: function(){ |
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202 | if(arguments && arguments[0] && arguments[0].iframeProxyUrl){ |
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203 | return new dojox.io.proxy.xip.XhrIframeFacade(arguments[0].iframeProxyUrl); |
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204 | }else{ |
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205 | return dojox.io.proxy.xip._xhrObjOld.apply(dojo, arguments); |
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206 | } |
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207 | }, |
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208 | |
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209 | //**** State-bound methods **** |
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210 | sendRequest: function(stateId, encodedData){ |
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211 | var state = this._state[stateId]; |
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212 | if(!state.isSending){ |
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213 | state.isSending = true; |
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214 | |
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215 | state.requestData = encodedData || ""; |
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216 | |
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217 | //Get a handle to the server iframe. |
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218 | state.serverWindow = frames[state.stateId]; |
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219 | if (!state.serverWindow){ |
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220 | state.serverWindow = document.getElementById(state.stateId).contentWindow; |
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221 | } |
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222 | |
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223 | //Make sure we have contentWindow, but only do this for non-postMessage |
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224 | //browsers (right now just opera is postMessage). |
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225 | if(typeof document.postMessage == "undefined"){ |
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226 | if(state.serverWindow.contentWindow){ |
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227 | state.serverWindow = state.serverWindow.contentWindow; |
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228 | } |
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229 | } |
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230 | |
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231 | this.sendRequestStart(stateId); |
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232 | } |
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233 | }, |
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234 | |
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235 | sendRequestStart: function(stateId){ |
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236 | //Break the message into parts, if necessary. |
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237 | var state = this._state[stateId]; |
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238 | state.requestParts = []; |
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239 | var reqData = state.requestData; |
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240 | var urlLength = state.serverUrl.length; |
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241 | var partLength = this.urlLimit - urlLength; |
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242 | var reqIndex = 0; |
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243 | |
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244 | while((reqData.length - reqIndex) + urlLength > this.urlLimit){ |
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245 | var part = reqData.substring(reqIndex, reqIndex + partLength); |
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246 | //Safari will do some extra hex escaping unless we keep the original hex |
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247 | //escaping complete. |
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248 | var percentIndex = part.lastIndexOf("%"); |
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249 | if(percentIndex == part.length - 1 || percentIndex == part.length - 2){ |
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250 | part = part.substring(0, percentIndex); |
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251 | } |
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252 | state.requestParts.push(part); |
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253 | reqIndex += part.length; |
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254 | } |
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255 | state.requestParts.push(reqData.substring(reqIndex, reqData.length)); |
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256 | |
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257 | state.partIndex = 0; |
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258 | this.sendRequestPart(stateId); |
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259 | |
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260 | }, |
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261 | |
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262 | sendRequestPart: function(stateId){ |
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263 | var state = this._state[stateId]; |
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264 | |
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265 | if(state.partIndex < state.requestParts.length){ |
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266 | //Get the message part. |
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267 | var partData = state.requestParts[state.partIndex]; |
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268 | |
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269 | //Get the command. |
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270 | var cmd = "part"; |
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271 | if(state.partIndex + 1 == state.requestParts.length){ |
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272 | cmd = "end"; |
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273 | }else if (state.partIndex == 0){ |
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274 | cmd = "start"; |
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275 | } |
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276 | |
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277 | this.setServerUrl(stateId, cmd, partData); |
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278 | state.partIndex++; |
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279 | } |
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280 | }, |
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281 | |
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282 | setServerUrl: function(stateId, cmd, message){ |
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283 | var serverUrl = this.makeServerUrl(stateId, cmd, message); |
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284 | var state = this._state[stateId]; |
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285 | |
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286 | //Safari won't let us replace across domains. |
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287 | if(this._isWebKit){ |
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288 | state.serverWindow.location = serverUrl; |
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289 | }else{ |
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290 | state.serverWindow.location.replace(serverUrl); |
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291 | } |
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292 | }, |
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293 | |
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294 | makeServerUrl: function(stateId, cmd, message){ |
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295 | var state = this._state[stateId]; |
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296 | var serverUrl = state.serverUrl + "#" + (state.idCounter++) + ":" + cmd; |
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297 | if(message){ |
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298 | serverUrl += ":" + message; |
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299 | } |
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300 | return serverUrl; |
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301 | }, |
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302 | |
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303 | fragmentReceivedEvent: function(evt){ |
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304 | // summary: |
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305 | // HTML5 document messaging endpoint. Unpack the event to see if we want to use it. |
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306 | if(evt.uri.split("#")[0] == this.fullXipClientUrl){ |
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307 | this.fragmentReceived(evt.data); |
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308 | } |
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309 | }, |
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310 | |
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311 | fragmentReceived: function(frag){ |
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312 | var index = frag.indexOf("#"); |
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313 | var stateId = frag.substring(0, index); |
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314 | var encodedData = frag.substring(index + 1, frag.length); |
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315 | |
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316 | var msg = this.unpackMessage(encodedData); |
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317 | var state = this._state[stateId]; |
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318 | |
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319 | switch(msg.command){ |
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320 | case "loaded": |
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321 | this.frameLoaded(stateId); |
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322 | break; |
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323 | case "ok": |
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324 | this.sendRequestPart(stateId); |
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325 | break; |
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326 | case "start": |
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327 | state.responseMessage = "" + msg.message; |
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328 | this.setServerUrl(stateId, "ok"); |
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329 | break; |
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330 | case "part": |
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331 | state.responseMessage += msg.message; |
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332 | this.setServerUrl(stateId, "ok"); |
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333 | break; |
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334 | case "end": |
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335 | this.setServerUrl(stateId, "ok"); |
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336 | state.responseMessage += msg.message; |
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337 | this.receive(stateId, state.responseMessage); |
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338 | break; |
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339 | } |
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340 | }, |
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341 | |
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342 | unpackMessage: function(encodedMessage){ |
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343 | var parts = encodedMessage.split(":"); |
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344 | var command = parts[1]; |
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345 | encodedMessage = parts[2] || ""; |
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346 | |
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347 | var config = null; |
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348 | if(command == "init"){ |
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349 | var configParts = encodedMessage.split("&"); |
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350 | config = {}; |
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351 | for(var i = 0; i < configParts.length; i++){ |
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352 | var nameValue = configParts[i].split("="); |
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353 | config[decodeURIComponent(nameValue[0])] = decodeURIComponent(nameValue[1]); |
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354 | } |
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355 | } |
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356 | return {command: command, message: encodedMessage, config: config}; |
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357 | } |
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358 | } |
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359 | |
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360 | //Replace the normal XHR factory with the proxy one. |
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361 | dojox.io.proxy.xip._xhrObjOld = dojo._xhrObj; |
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362 | dojo._xhrObj = dojox.io.proxy.xip.createFacade; |
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363 | |
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364 | /** |
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365 | Using this a reference: http://www.w3.org/TR/XMLHttpRequest/ |
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366 | |
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367 | Does not implement the onreadystate callback since dojo.xhr* does |
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368 | not use it. |
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369 | */ |
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370 | dojox.io.proxy.xip.XhrIframeFacade = function(ifpServerUrl){ |
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371 | // summary: |
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372 | // XMLHttpRequest facade object used by dojox.io.proxy.xip. |
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373 | // |
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374 | // Do not use this object directly. See the Dojo Book page |
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375 | // on XMLHttpRequest IFrame Proxying: |
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376 | // http://dojotoolkit.org/book/dojo-book-0-4/part-5-connecting-pieces/i-o/cross-domain-xmlhttprequest-using-iframe-proxy |
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377 | this._requestHeaders = {}; |
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378 | this._allResponseHeaders = null; |
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379 | this._responseHeaders = {}; |
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380 | this._method = null; |
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381 | this._uri = null; |
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382 | this._bodyData = null; |
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383 | this.responseText = null; |
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384 | this.responseXML = null; |
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385 | this.status = null; |
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386 | this.statusText = null; |
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387 | this.readyState = 0; |
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388 | |
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389 | this._ifpServerUrl = ifpServerUrl; |
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390 | this._stateId = null; |
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391 | } |
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392 | |
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393 | dojo.extend(dojox.io.proxy.xip.XhrIframeFacade, { |
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394 | //The open method does not properly reset since Dojo does not reuse XHR objects. |
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395 | open: function(/*String*/method, /*String*/uri){ |
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396 | this._method = method; |
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397 | this._uri = uri; |
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398 | |
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399 | this.readyState = 1; |
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400 | }, |
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401 | |
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402 | setRequestHeader: function(/*String*/header, /*String*/value){ |
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403 | this._requestHeaders[header] = value; |
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404 | }, |
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405 | |
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406 | send: function(/*String*/stringData){ |
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407 | this._bodyData = stringData; |
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408 | |
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409 | this._stateId = dojox.io.proxy.xip.send(this); |
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410 | |
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411 | this.readyState = 2; |
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412 | }, |
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413 | abort: function(){ |
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414 | dojox.io.proxy.xip.destroyState(this._stateId); |
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415 | }, |
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416 | |
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417 | getAllResponseHeaders: function(){ |
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418 | return this._allResponseHeaders; //String |
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419 | }, |
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420 | |
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421 | getResponseHeader: function(/*String*/header){ |
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422 | return this._responseHeaders[header]; //String |
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423 | }, |
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424 | |
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425 | _setResponseHeaders: function(/*String*/allHeaders){ |
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426 | if(allHeaders){ |
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427 | this._allResponseHeaders = allHeaders; |
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428 | |
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429 | //Make sure ther are now CR characters in the headers. |
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430 | allHeaders = allHeaders.replace(/\r/g, ""); |
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431 | var nvPairs = allHeaders.split("\n"); |
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432 | for(var i = 0; i < nvPairs.length; i++){ |
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433 | if(nvPairs[i]){ |
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434 | var nameValue = nvPairs[i].split(": "); |
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435 | this._responseHeaders[nameValue[0]] = nameValue[1]; |
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436 | } |
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437 | } |
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438 | } |
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439 | } |
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440 | }); |
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441 | |
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442 | return dojox.io.proxy.xip; |
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443 | |
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444 | }); |
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