Angular: Using $http in a provider - angularjs

Question

I've created an angular Provider which is exposing a getSession method which I need to resolve before going into a specific route:
var serviceId = 'session';
angular.module("app").provider(serviceId, sessionProvider);
function sessionProvider() {
this.session = undefined;
this.$get = function($http) {
return {
getSession: function () {
return $http.get("/session-info")
.then(_onSuccess, _onError);
}
}
}
function _onSuccess(data) {
return data.data;
}
function _onError(data) {
return data;
}
}
I then inject it into my config and try to use it:
angular.module("app").config([
"$routeProvider", "$httpProvider", "sessionProvider", function
($routeProvider, $httpProvider, sessionProvider) {
$routeProvider.when("/", {
templateUrl: "app/home/home.html",
resolve: {
session: sessionProvider.getSession()
}
});
}
]);
But I get the following error:
Uncaught Error: [$injector:modulerr] Failed to instantiate module app due to:
TypeError: undefined is not a function
I'm not sure what I've done wrong here?
Edit
When I try #DrogoNevets answer below:
function sessionProvider() {
this.session = undefined;
this.$get = function ($http) {
return {
}
}
this.getSession = function () {
return $http.get("/session-info")
.then(_onSuccess, _onError);
}
function _onSuccess(data) {
this.session = data.data;
return data.data;
}
function _onError(data) {
return data;
}
}
I get the following error as I'm not able to inject $http into the provider itself, is that correct?
Uncaught Error: [$injector:modulerr] Failed to instantiate module app due to:
ReferenceError: $http is not defined

Answer 1

if you want to call getSession from the config part you need to assign it to this not within the $get part
try something like this:
function sessionProvider() {
var session;
this.$get = function() {
return {
getSession: this.getSession,
setSession: this.setSession
}
}
function _onSuccess(data) {
return data.data;
}
function _onError(data) {
return data;
}
this.getSession= function () {
return session
}
this.setSession= function (id) {
session = id;
}
}
here is a fiddle showing what I mean: http://jsfiddle.net/EQ86N/1/