TimerTriggered Function for monitoring Exchange ActiveSync

EASTimerTrigger.csx

#r "EAS Protocol.dll"
#r "System.Xml.Linq.dll"
using System;
using System.Net.Http.Headers;
using System.Xml.Linq;
using EAS_Protocol.WBXML;

public static void Run(TimerInfo myTimer,out string statuscode, out string responseBlob, TraceWriter log)
{
    log.Info($"C# Timer trigger function executed at: {DateTime.Now}");    
    
    string strServerAddress = "https://outlook.office365.com/Microsoft-Server-ActiveSync";
    string strDeviceId = "EASMD";
    string strDeviceType = "AzureFunction";
    string strUserAgent = "AzureFunction";
    string strASVersion = "14.1";
    string strUsername = "user@domain.com";
    string strPassword = "p@ssw0rd";
    
    string strEncCredentials = getEncCredentials(strUsername, strPassword);
    
    string uri = strServerAddress + "?Cmd=FolderSync&User=" + strUsername + "&DeviceId=" + strDeviceId +"&DeviceType=" + strDeviceType;
    log.Info($"Uri: {uri}");
    
    //We need a custom handler as we don't want to automatically follow 302s
    var handler = new HttpClientHandler() 
    {
        AllowAutoRedirect = false
    };

    var responseString = "";

    using (var client = new HttpClient(handler)) 
    { 
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/vnd.ms-sync.wbxml"));
        client.DefaultRequestHeaders.Add("MS-ASProtocolVersion", strASVersion);
        client.DefaultRequestHeaders.Add("User-Agent", strUserAgent);
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", strEncCredentials);

        //The wbxml required for initial FolderSync
        byte[] postBytes = new byte[13]{03,01,106,00,00,07,86,82,03,48,00,01,01};
        HttpContent byteContent = new ByteArrayContent(postBytes);

        HttpResponseMessage response = client.PostAsync(uri,byteContent).Result; 
        responseString = response.Content.ReadAsStringAsync().Result;   
        var status = (int)response.StatusCode;
        var guid =  Guid.NewGuid();
        
        //Output status code to queue
        statuscode = $"{guid};{status}";
        
        responseBlob = $"{guid};{responseString}";
        
        System.Text.UTF8Encoding utf8Encoding = new System.Text.UTF8Encoding();
        Byte[] byteResp = utf8Encoding.GetBytes(responseString);   
        log.Info($"Http: {status}, Content: {responseString}"); 
        
        WBXMLWriter wbxmlWriter = new WBXMLWriter(new ASCodePageProvider());
        WBXMLConverter wbxmlConverter = new WBXMLConverter(new ASCodePageProvider(), wbxmlWriter, null);                   

        XElement destXml = wbxmlConverter.Parse(byteResp);

        log.Info($"WBXML:{System.Environment.NewLine}{destXml.ToString()}");
    }  
    
}

private static string getEncCredentials(string emailadress, string password)
{
    string strEmailAddress = emailadress;
    string strPassword = password;

    string strRawCredentials = strEmailAddress + ":" + strPassword;

    //Need to base64 encode the credentials
    System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
    Byte[] byteSource = encoding.GetBytes(strRawCredentials);
    string strEncCredentials = System.Convert.ToBase64String(byteSource);

    return strEncCredentials;
}