/// <summary>
/// Initializes the EmergencyContext object and stores it in HttpContext.Items bag.
/// </summary>
public static EmergencyContext CreateContext()
{
EmergencyContext eContext = null;
//make sure one does not exist first
HttpContext current = HttpContext.Current;
if (current != null)
{
if (current.Items[_itemsKey] != null)
{
throw new Exception(_itemsKey + " Already Exists");
}
else
{
eContext = new EmergencyContext();
current.Items.Add(_itemsKey, eContext);
}
}
else
{
throw new Exception("HttpContext.Current does not exist");
}
return(eContext);
}
void context_BeginRequest(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
HttpContext currContext = app.Context;
//Since we only want to do this for .aspx files to cutdown on DB requests,
//we need to check the extension.
string currPath = currContext.Request.Path;
if (!string.IsNullOrEmpty(currPath))
{
string ext = VirtualPathUtility.GetExtension(currPath); //.aspx
ext = ext.ToLower();
if (ext != ".aspx")
{
return;
}
}
//First see if there is an emergency and store it in the HttpContext. (So we do not have
//to keep going back to the db.
EmergencyContext context = EmergencyContext.CreateContext();
if (context == null)
{
//Log error
}
else
{
//Secondly if we need to redirect ALL requests to the emergency page then we should
//redirect.
if (context.RedirectAllPages)
{
//check to see if this is the emergency url. Note since the emergency page is a flat
//aspx, it will not be a prettyURL and therefore not rewritten.
if (currContext.Request.RawUrl.ToLower() != context.EmergencyUrl.ToLower())
{
currContext.Response.Redirect(context.EmergencyUrl, true);
}
}
}
}
protected override void OnInit(EventArgs e)
{
this.Visible = false;
this.eContext = EmergencyContext.Current;
//We should not show this on the print version.
bool isPrint = Strings.ToBoolean(Page.Request.Params["print"]);
if (this.eContext != null)
{
if (!isPrint && this.eContext.InEmergency && !string.IsNullOrEmpty(this.eContext.BannerText) && !IsEmergencyPage())
{
//Should not show this if it is the emergency page also...
//Turn on only in an emergency && only if there is some text for the banner.
this.Visible = true;
}
}
this.CssClass = "EmergencyAlertBanner";
}
protected override void RenderContents(HtmlTextWriter output)
{
EmergencyContext ctx = EmergencyContext.Current;
if (ctx == null || !ctx.InEmergency)
{
output.RenderBeginTag(HtmlTextWriterTag.H1);
output.Write("There is currently no emergency.");
output.RenderEndTag();
}
else
{
output.RenderBeginTag(HtmlTextWriterTag.H1);
output.Write(ctx.Title);
output.RenderEndTag();
output.AddAttribute(HtmlTextWriterAttribute.Class, "message");
output.RenderBeginTag(HtmlTextWriterTag.Div);
output.Write(ctx.Information);
output.RenderEndTag();
}
}
