Call EWS from SharePoint 2013 SharePoint Hosted App (JavaScript) in Office 365

Question

I am trying to call the exchange web service (EWS) of an exchange online server from a SharePoint hosted app. I am limited thus to the use of Javascript. During my call i am always getting an access denied error.
The body of the SOAP request is good since I have tested it using a client application, but I am not being able to get it to work via a jquery ajax call. I am sure that this is an authentification issue and I have no problem sending the credentials during
the call. I have added them in the header. This is what I have ended up doing but still no luck.
functionGetUnReadEmailCount() {
varsoapPacket = "<?xml version='1.0' encoding='utf-8'?>"+
"<soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'xmlns:t='http://schemas.microsoft.com/exchange/services/2006/types'>"+
'<soap:Header>'+
'<wsse:Security>'+
'<wsse:UsernameToken>'+
'<wsse:Username>******</wsse:Username>'+
'<wsse:Password>******</wsse:Password>'+
'</wsse:UsernameToken>'+
'</wsse:Security>'+
'</soap:Header>'+
"<soap:Body>"+
"<FindItem xmlns='http://schemas.microsoft.com/exchange/services/2006/messages' xmlns:t='http://schemas.microsoft.com/exchange/services/2006/types'Traversal='Shallow'>"+
"<ItemShape>"+
"<t:BaseShape>IdOnly</t:BaseShape>"+
"</ItemShape>"+
"<IndexedPageItemView MaxEntriesReturned='50' Offset='0' BasePoint='Beginning' />"+
"<Restriction>"+
"<t:IsEqualTo>"+
"<t:FieldURI FieldURI='message:IsRead' />"+
"<t:FieldURIOrConstant>"+
"<t:Constant Value='false' />"+
"</t:FieldURIOrConstant>"+
"</t:IsEqualTo>"+
"</Restriction>"+
"<ParentFolderIds>"+
"<t:DistinguishedFolderId Id='inbox' />"+
"</ParentFolderIds>"+
"</FindItem>"+
"</soap:Body>"+
"</soap:Envelope>";
$.support.cors = true;
$.ajax({
        url: "https://outlook.office365.com/EWS/Exchange.asmx",
        type: "POST",
        dataType: "xml",
        data: soapPacket,
        complete: processResult,
        error: OnError,
        contentType: "text/xml; charset=\"utf-8\""
Any help is highly appreciated.
Thanks.
Elie

Answer 1

Hi Elie,
Since this forum is discussing about Developing Apps for Office 2013, and your issue is more related about Exchange development. I will move this thread to the more related forum.
Reference:
https://social.msdn.microsoft.com/Forums/en-US/home?forum=exchangesvrdevelopment
Thanks for your understanding.
Best Regards,
Edward
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.