michael@0: (function(global) {
michael@0:   "use strict";
michael@0: 
michael@0:   function IDPJS() {
michael@0:     this.domain = window.location.host;
michael@0:     var p = window.location.pathname;
michael@0:     this.protocol = p.substring(p.lastIndexOf('/') + 1) + window.location.hash;
michael@0:     this.username = "someone@" + this.domain;
michael@0:     // so rather than create a million different IdP configurations and litter
michael@0:     // the world with files all containing near-identical code, let's use the
michael@0:     // hash/URL fragment as a way of generating instructions for the IdP
michael@0:     this.instructions = window.location.hash.replace("#", "").split(":");
michael@0:     this.port = window.rtcwebIdentityPort;
michael@0:     this.port.onmessage = this.receiveMessage.bind(this);
michael@0:     this.sendResponse({
michael@0:       type : "READY"
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   IDPJS.prototype.getDelay = function() {
michael@0:     // instructions in the form "delay123" have that many milliseconds
michael@0:     // added before sending the response
michael@0:     var delay = 0;
michael@0:     function addDelay(instruction) {
michael@0:       var m = instruction.match(/^delay(\d+)$/);
michael@0:       if (m) {
michael@0:         delay += parseInt(m[1], 10);
michael@0:       }
michael@0:     }
michael@0:     this.instructions.forEach(addDelay);
michael@0:     return delay;
michael@0:   };
michael@0: 
michael@0:   function is(target) {
michael@0:     return function(instruction) {
michael@0:       return instruction === target;
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   IDPJS.prototype.sendResponse = function(response) {
michael@0:     // we don't touch the READY message unless told to
michael@0:     if (response.type === "READY" && !this.instructions.some(is("ready"))) {
michael@0:       this.port.postMessage(response);
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     // if any instruction is "error", return an error.
michael@0:     if (this.instructions.some(is("error"))) {
michael@0:       response.type = "ERROR";
michael@0:     }
michael@0: 
michael@0:     window.setTimeout(function() {
michael@0:       this.port.postMessage(response);
michael@0:     }.bind(this), this.getDelay());
michael@0:   };
michael@0: 
michael@0:   IDPJS.prototype.receiveMessage = function(ev) {
michael@0:     var message = ev.data;
michael@0:     switch (message.type) {
michael@0:     case "SIGN":
michael@0:       if (message.username) {
michael@0:         var at = message.username.indexOf("@");
michael@0:         if (at < 0) {
michael@0:           this.username = message.username + "@" + this.domain;
michael@0:         } else if (message.username.substring(at + 1) === this.domain) {
michael@0:           this.username = message.username;
michael@0:         }
michael@0:       }
michael@0:       this.sendResponse({
michael@0:         type : "SUCCESS",
michael@0:         id : message.id,
michael@0:         message : {
michael@0:           idp : {
michael@0:             domain : this.domain,
michael@0:             protocol : this.protocol
michael@0:           },
michael@0:           assertion : JSON.stringify({
michael@0:             username : this.username,
michael@0:             contents : message.message
michael@0:           })
michael@0:         }
michael@0:       });
michael@0:       break;
michael@0: 
michael@0:     case "VERIFY":
michael@0:       var payload = JSON.parse(message.message);
michael@0:       var contents = payload.contents;
michael@0:       if (this.instructions.some(is("bad"))) {
michael@0:         contents = {};
michael@0:       }
michael@0:       this.sendResponse({
michael@0:         type : "SUCCESS",
michael@0:         id : message.id,
michael@0:         message : {
michael@0:           identity : payload.username,
michael@0:           contents : contents
michael@0:         }
michael@0:       });
michael@0:       break;
michael@0: 
michael@0:     default:
michael@0:       this.sendResponse({
michael@0:         type : "ERROR",
michael@0:         id : message.id,
michael@0:         error : JSON.stringify(message)
michael@0:       });
michael@0:       break;
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   global.idp = new IDPJS();
michael@0: }(this));