152 lines
4.0 KiB
JavaScript
Executable File
152 lines
4.0 KiB
JavaScript
Executable File
/* classe API */
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function API(target){ this.target = target; }
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API.prototype = {
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xhr: [], // tableau d'objets pour les requêtes ajax
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buffer: null, // Contiendra le buffer pour debugger si erreur de parsage
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error: { // error constants
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'-1': 'Invalid target format: "METHOD module/method"',
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'-2': 'XHR error',
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'-3': 'Invalid JSON response',
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},
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/* transaction avec le serveur (http://{host}/api/)
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*
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* @param pTarget<String> URI cible, format "HTTP_METHOD uri/uri/uri"
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* @param pArgs<Object> Le tableu d'arguments passé en POST (attribut<->postfield) à http://{host}/api/
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* @param pHandler<Function> Fonction qui s'éxécutera lors de la réponse (1 argument -> réponse<Object>)
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* @param pToken<String> Optionnel, token d'auth pour l'api
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*
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***************************************************************************************************
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*
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* @usecase
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* 1. api.call(
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* 2. "PUT newspaper/article/4"
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* 2. { content: "New article content" },
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* 3. function(resp){
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* 4. alert(resp.error);
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* 5. }
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* 6. );
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*
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*/
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call: function(pTarget, pArgs, pHandler, pToken=null){
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/* (1) Check @pHandler (for dispatching errors)
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---------------------------------------------------------*/
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/* (1) Check if is a Function */
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if( !(pHandler instanceof Function) )
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throw new Error("3rd argument must be a function, but is of type '"+typeof(pHandler)+"' !");
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/* (2) Check @pTarget
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---------------------------------------------------------*/
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/* (1) Check format */
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if( !/^([A-Z]+) (.+)/i.test(pTarget) ){
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pHandler({ error: -1, ErrorDescription: this.error['-1'] });
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return false;
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}
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/* (2) Store locally data */
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var lHttpMethod = RegExp.$1;
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var lUri = RegExp.$2;
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/* (3) Create form data
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---------------------------------------------------------*/
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/* (1) Create virtual form */
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var lForm = new FormData();
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/* (2) Add attributes */
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for( var key in pArgs ){
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// {2.1} If a file -> send as it //
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if( pArgs[key] instanceof File )
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lForm.append(key, pArgs[key]);
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// {2.2} Else -> JSON stringify //
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else
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lForm.append(key, JSON.stringify(pArgs[key]));
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}
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/* (4) Create XHR request
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---------------------------------------------------------*/
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/* (1) Clean ended requests */
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for( var i = this.xhr.length-1 ; i >= 0 ; i-- ){
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if( this.xhr[i] != null )
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break;
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this.xhr.pop();
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}
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/* (2) Push a new entry -> fetch its index */
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i = this.xhr.push(null) - 1;
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/* (3) Create XHR object */
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this.xhr[i] = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHttpRequest');
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/* (5) Bind response event
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---------------------------------------------------------*/
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var self = this; // to access the buffer
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this.xhr[i].onreadystatechange = function(i){
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/* (1) If request over */
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if( this.xhr[i].readyState == 4 ){
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/* (2) Update buffer (for debug) */
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self.buffer = this.xhr[i].responseText;
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/* (3) If request success */
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if( [0, 200, 417].indexOf(this.xhr[i].status) > -1 ){
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/* (3.1) Create default response (if JSON error) */
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var response = {error:-3, ErrorDescription: self.error['-3']};
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/* (3.2) Try to parse JSON */
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try{ response = JSON.parse(this.xhr[i].responseText); }catch(e){}
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/* (3.3) Launch @pHandler with response */
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pHandler(response);
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/* (4) If request error */
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}else
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pHandler({ error:-2, ErrorDescription: self.error['-2'] });
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/* (5) Notify current xhr instance is done */
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this.xhr[i] = null;
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}
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}.bind(this, i);
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/* (6) Finish & send request
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---------------------------------------------------------*/
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/* (1) Open the XHR */
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this.xhr[i].open(lHttpMethod, this.target+lUri, true);
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/* (2) Manage optional token */
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if( pToken != null )
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this.xhr[i].setRequestHeader('Authorization', 'Digest '+pToken);
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/* (3) Custom header to notify we're using Ajax */
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this.xhr[i].setRequestHeader('X-Requested-With', 'XMLHttpRequest');
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/* (4) Make the call */
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this.xhr[i].send( lForm );
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return true;
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}
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}; |