source: Dev/trunk/src/client/dojox/io/xhrMultiPart.js @ 532

define([
        "dojo/_base/kernel",
        "dojo/_base/array",
        "dojo/_base/xhr",
         "dojo/query",
        "dojox/uuid/generateRandomUuid"
], function(dojo, array, xhr, query, generateRandomUuid){
        dojo.getObject("io.xhrMultiPart", true, dojox);

        /*=====
        var __xhrContentArgs = {
                // name: String
                //              Name of the form value.
                // content: String
                //              The contents of the value.
                // filename: String?
                //              An optional filename to pass to the server, as defined by the boundary.
                // contentType: String?
                //              An optional content-type (MIME) to pass to the server, if value is being
                //              treated as a file.
                // charset: String?
                //              Optional charset to pass, for the server to interpret the file correctly.
                // contentTransferEncoding: String?
                //              Optional transfer encoding header value.
        };
        =====*/
        function _createPart(/*__xhrContentArgs */args, /* String */boundary){
                // summary:
                //              Assemble an array of boundary parts based on the passed values in args.
                if(!args["name"] && !args["content"]){
                        throw new Error("Each part of a multi-part request requires 'name' and 'content'.");
                }

                var tmp = [];
                tmp.push(
                        "--" + boundary,
                         "Content-Disposition: form-data; name=\"" + args.name + "\"" + (args["filename"] ? "; filename=\"" + args.filename + "\"" : "")
                );

                if(args["contentType"]){
                        var ct = "Content-Type: " + args.contentType;
                        if(args["charset"]){
                                ct += "; Charset=" + args.charset;
                        }
                        tmp.push(ct);
                }

                if(args["contentTransferEncoding"]){
                        tmp.push("Content-Transfer-Encoding: " + args.contentTransferEncoding);
                }
                tmp.push("", args.content);
                return tmp;             //      Array
        }

        function _partsFromNode(/* DOMNode */node, /* String */boundary){
                // summary:
                //              Assemble an array of boundary parts based on the passed FORM node.
                var o=dojo.formToObject(node), parts=[];
                for(var p in o){
                        if(dojo.isArray(o[p])){
                                dojo.forEach(o[p], function(item){
                                        parts = parts.concat(_createPart({ name: p, content: item }, boundary));
                                });
                        } else {
                                parts = parts.concat(_createPart({ name: p, content: o[p] }, boundary));
                        }
                }
                return parts;   //      Array
        }

        /*=====
        var __xhrMultiArgs = {
                // url: String
                //              URL to server endpoint.
                // content: Object?
                //              Contains properties with string values. These
                //              properties will be serialized using multi-part
                //              boundaries.
                // file: Object?
                //              Alias for "content".  Provided for backwards compatibility.
                // timeout: Integer?
                //              Milliseconds to wait for the response. If this time
                //              passes, the then error callbacks are called.
                // form: DOMNode?
                //              DOM node for a form. Used to extract the form values
                //              and send to the server; each form value will be serialized
                //              using multi-part boundaries.
                // preventCache: Boolean?
                //              Default is false. If true, then a
                //              "dojo.preventCache" parameter is sent in the request
                //              with a value that changes with each request
                //              (timestamp). Useful only with GET-type requests.
                // handleAs: String?
                //              Acceptable values depend on the type of IO
                //              transport (see specific IO calls for more information).
                // load: Function?
                //              function(response, ioArgs){}. response is an Object, ioArgs
                //              is of type dojo.__IoCallbackArgs. The load function will be
                //              called on a successful response.
                // error: Function?
                //              function(response, ioArgs){}. response is an Object, ioArgs
                //              is of type dojo.__IoCallbackArgs. The error function will
                //              be called in an error case.
                // handle: Function?
                //              function(response, ioArgs){}. response is an Object, ioArgs
                //              is of type dojo.__IoCallbackArgs. The handle function will
                //              be called in either the successful or error case.
        };
        =====*/
        dojox.io.xhrMultiPart = function(/* __xhrMultiArgs */args){
                if(!args["file"] && !args["content"] && !args["form"]){
                        throw new Error("content, file or form must be provided to dojox.io.xhrMultiPart's arguments");
                }

                // unique guid as a boundary value for multipart posts
                var boundary=generateRandomUuid(), tmp=[], out="";
                if(args["file"] || args["content"]){
                        var v = args["file"] || args["content"];
                        dojo.forEach((dojo.isArray(v) ? v : [v]), function(item){
                                tmp = tmp.concat(_createPart(item, boundary));
                        });
                }
                else if(args["form"]){
                        if(query("input[type=file]", args["form"]).length){
                                throw new Error("dojox.io.xhrMultiPart cannot post files that are values of an INPUT TYPE=FILE.  Use dojo.io.iframe.send() instead.");
                        }
                        tmp = _partsFromNode(args["form"], boundary);
                }

                if(tmp.length){
                        tmp.push("--"+boundary+"--", "");
                        out = tmp.join("\r\n");
                }

                console.log(out);

                return dojo.rawXhrPost(dojo.mixin(args, {
                        contentType: "multipart/form-data; boundary=" + boundary,
                        postData: out
                }));    //      dojo.Deferred
        };

        return dojox.io.xhrMultiPart;
});