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(Tcl) How to Generate an Azure Service Bus Shared Access Signature (SAS)

Demonstrates generating and using an Azure Service Bus Shared Access Signature (SAS).

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  Note: Requires Chilkat v9.5.0.65 or greater.

#  This requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  -------------------------------------------------------------------
#  Create a Shared Access Signature (SAS) token for Azure Service Bus.
#  -------------------------------------------------------------------

set authSas [new_CkAuthAzureSAS]

CkAuthAzureSAS_put_AccessKey $authSas "AzureServiceBus_PrimaryKey"

#  The SAS token for Service Bus will look like this:
#  (The order of params will be different.  The order does not matter.)
#  sig=<signature-string>&se=<expiry>&skn=<keyName>&sr=<URL-encoded-resourceURI>

#  Specify the format of the string to sign.
CkAuthAzureSAS_put_StringToSign $authSas "resourceURI,expiry"

#  Create an expiry to 30 days in the future.
set dtExpiry [new_CkDateTime]

CkDateTime_SetFromCurrentSystemTime $dtExpiry
CkDateTime_AddDays $dtExpiry 30
CkAuthAzureSAS_SetTokenParam $authSas "expiry" "se" [CkDateTime_getAsUnixTimeStr $dtExpiry 1]

#  Set the skn (keyname)
#  This example uses the key "RootManageSharedAccessKey".  This give full access.
#  In a typical scenario, you would create a new Azure key (for the service bus)
#  in the Azure portal, such that the key has limited permissions.  This would
#  allow you to give the SAS token to others for specific access for some period of time.
CkAuthAzureSAS_SetTokenParam $authSas "keyName" "skn" "RootManageSharedAccessKey"

#  Set the URL-encoded-resourceURI
set sbResourceUri [new_CkStringBuilder]

CkStringBuilder_Append $sbResourceUri "https://<yournamespace>.servicebus.windows.net/"
CkStringBuilder_Encode $sbResourceUri "url" "utf-8"
CkAuthAzureSAS_SetTokenParam $authSas "resourceURI" "sr" [CkStringBuilder_getAsString $sbResourceUri]

#  Generate the SAS token.
set sasToken [CkAuthAzureSAS_generateToken $authSas]
if {[expr [CkAuthAzureSAS_get_LastMethodSuccess $authSas] != 1]} then {
    puts [CkAuthAzureSAS_lastErrorText $authSas]
    delete_CkAuthAzureSAS $authSas
    delete_CkDateTime $dtExpiry
    delete_CkStringBuilder $sbResourceUri
    exit
}

puts "SAS token: $sasToken"

#  Save the SAS token to a file.
#  We can then use this pre-generated token for future Service Bus operations.
set fac [new_CkFileAccess]

CkFileAccess_WriteEntireTextFile $fac "qa_data/tokens/serviceBusSas.txt" $sasToken "utf-8" 0

delete_CkAuthAzureSAS $authSas
delete_CkDateTime $dtExpiry
delete_CkStringBuilder $sbResourceUri
delete_CkFileAccess $fac

 

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