Configuration :: Server Trust Level And Twitter Application Interface - Error "System.Security.Permissions.SecurityPermission, Mscorlib"
Oct 14, 2010
There seems to be an issue with the "Trust" level when executing within a "Cloud" environment. In order for the following app to work it needs a trust level of at least "Medium." This web app is developed using VB.NET 3.5, and Visual Studio 2008. The app works perfectly on my local sever but when deployed/published to the "Cloud" it returns the error: System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. I have added all 4 required values, ConsumerKey, ConsumerSecret, OAuthToken, and OAuthTokenSecret to the web.config file in the "appSettings" section of the "configuration"
[Code]....
If found that by going to [URL] and signing into the account that is using the application, then go to the "Settings" page, go to the bottom of the page and click on the "API" menu option. Once the API page appears you will clik on the button "2", Register An App. On the right side on the new page, you will see a button "View Your Applications." If you have previously registered your app, click this button, If not fill out the appliction for a new app. Now at the View your Applications page, select the app you want to get the authorization keys for where is says "Edit Details". Now click on the button to the right that says, "Application Detail." Here you will find your Consumer Key and your Consumer Secret Key. On the right side of this page you will see the menu option "My Access Token", click it and you will find your oauth_token and your oauth_token_secret keys! Not that you have all the keys, put them in the "appSettings" section of the web.config file. Add "Dim twConn As New TwitterVB2.TwitterAPI" at the top of the page.
I then created a subroutine where I pass in the Tweet:
[Code]....
This code works great in an enviornment that allows at least a "Medium" trust level. However it appears that many of the "new" hosting envrionments such as "Cloud Hosting" and others do not allow this trust level automatically!However if the trust level is less than "Medium" on your host you will likely receive the error message: "Twitter Returned: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed." If anyone has found a fix for this "Trust Level"
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[Code]....
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Exception Details: System.Security.Security
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System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark stackMark) +64
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Version Information: Microsoft .NET Framework Version:2.0.50727.4952; ASP.NET Version:2.0.50727.4955
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AspNetHostingPermissionLevel GetCurrentTrustLevel() {
foreach (AspNetHostingPermissionLevel trustLevel in
new AspNetHostingPermissionLevel [] {
AspNetHostingPermissionLevel.Unrestricted,
AspNetHostingPermissionLevel.High,
AspNetHostingPermissionLevel.Medium,
AspNetHostingPermissionLevel.Low,
AspNetHostingPermissionLevel.Minimal
} ) {
try {
new AspNetHostingPermission(trustLevel).Demand();
}
catch (System.Security.SecurityException ) {
continue;
}
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}
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}
Get current ASP.NET Trust Level programmatically):
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I tried myself and got the following VB.NET code but it generates an error inside my VWD:
Private Function GetCurrentTrustLevel() As AspNetHostingPermissionLevel
For Each trustLevel As AspNetHostingPermissionLevel In New _
AspNetHostingPermissionLevel() {AspNetHostingPermissionLevel.Unrestricted, _
AspNetHostingPermissionLevel.High, AspNetHostingPermissionLevel.Medium, _
AspNetHostingPermissionLevel.Low, AspNetHostingPermissionLevel.Minimal}
Try
New AspNetHostingPermission(trustLevel).Demand()
Catch generatedExceptionName As System.Security.SecurityException
Continue Try
End Try
Return trustLevel
Next
Return AspNetHostingPermissionLevel.None
End Function
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New AspNetHostingPermission(trustLevel).Demand()
and
Continue Try
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[Code]....
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