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(Tcl) Get an Azure AD Access Token

Demonstrates how to obtain an Azure AD access token for authentication using a client ID, client secret, and tenant ID.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set socket [new_CkSocket]

# Make a TLS connection to login.microsoftonline.com, waiting at most 5000 milliseconds.
set success [CkSocket_Connect $socket "login.microsoftonline.com" 443 1 5000]
if {$success != 1} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

# Create an Azure AD auth object, and provide the required information for authorization.
set azureAD [new_CkAuthAzureAD]

CkAuthAzureAD_put_ClientId $azureAD "AZURE_AD_CLIENT_ID"
CkAuthAzureAD_put_ClientSecret $azureAD "AZURE_AD_CLIENT_SECRET"
CkAuthAzureAD_put_TenantId $azureAD "AZURE_TENANT_ID"

CkAuthAzureAD_put_Resource $azureAD "https://outlook.office365.com/"

# Retrieve the access token using the TLS connection to login.microsoftonline.com
set success [CkAuthAzureAD_ObtainAccessToken $azureAD $socket]
if {$success != 1} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    delete_CkAuthAzureAD $azureAD
    exit
}

# Show the access token, and then save it to a JSON file
# for future use (such as with a REST method call).
puts "Azure AD Access Token = [CkAuthAzureAD_accessToken $azureAD]"

set json [new_CkJsonObject]

CkJsonObject_AppendString $json "accessToken" [CkAuthAzureAD_accessToken $azureAD]

# Save our access token to a file.  It will be used in subsequent REST API calls.
set fac [new_CkFileAccess]

CkFileAccess_WriteEntireTextFile $fac "qa_data/tokens/azureAD_office365.json" [CkJsonObject_emit $json] "utf-8" 0

# Let's get the id information out of the access token.
# Our JSON looks like this:
# {"accessToken":"eyJ0eXAiO---TdjT3RjIn0.eyJhdWQiOiJo---jEuMCJ9.CIx0sUT8s---KvzKKUw"}

# I used "---" instead of "..." to indicate a large quantity of omitted chars.
# The accessToken is a long string composed of 3 base64 strings concatenated with "." chars.
# The 1st part is the JOSE header.  If you decode from base64, you'll get the JSON JOSE header.
# The 2nd part is the id token.  When decoded this is the JSON that contains information about the authenticated application.
# The 3rd part is binary and does not decode to JSON.

# Let's get the information from the 2nd part (the id token)
set sa [new_CkStringArray]

CkStringArray_SplitAndAppend $sa [CkJsonObject_stringOf $json "accessToken"] "."

set sbIdToken [new_CkStringBuilder]

# The 2nd string is at index 1.
CkStringBuilder_Append $sbIdToken [CkStringArray_getString $sa 1]
CkStringBuilder_Decode $sbIdToken "base64" "utf-8"

set jsonIdToken [new_CkJsonObject]

CkJsonObject_LoadSb $jsonIdToken $sbIdToken
CkJsonObject_put_EmitCompact $jsonIdToken 0
puts [CkJsonObject_emit $jsonIdToken]

# We have something like this:
# {
#   "aud": "https://outlook.office365.com/",
#   "iss": "https://sts.windows.net/6e8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/",
#   "iat": 1586350465,
#   "nbf": 1586350465,
#   "exp": 1586354365,
#   "aio": "42dgYNjyOtX8ZZB7JLfMFJGeKUmvAA==",
#   "app_displayname": "ChilkatTest",
#   "appid": "f125d695-c50e-456e-a578-a486f06d1213",
#   "appidacr": "1",
#   "idp": "https://sts.windows.net/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/",
#   "oid": "7545a2fd-3f0d-48a4-9c58-a1a5700a24b1",
#   "sid": "ab981252-9378-4d0c-964b-eb2e1451138f",
#   "sub": "7546a2fc-3f0d-48a4-9c58-a1a5700a24b1",
#   "tid": "6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd",
#   "uti": "huIJBAa1tvGpczwV5S1BAA",
#   "ver": "1.0"
# }

# Get the desired information from the JSON:
set aud [CkJsonObject_stringOf $jsonIdToken "aud"]
set iss [CkJsonObject_stringOf $jsonIdToken "iss"]
set iat [CkJsonObject_IntOf $jsonIdToken "iat"]
set nbf [CkJsonObject_IntOf $jsonIdToken "nbf"]
set exp [CkJsonObject_IntOf $jsonIdToken "exp"]
set aio [CkJsonObject_stringOf $jsonIdToken "aio"]
set app_displayname [CkJsonObject_stringOf $jsonIdToken "app_displayname"]
set appid [CkJsonObject_stringOf $jsonIdToken "appid"]
set appidacr [CkJsonObject_stringOf $jsonIdToken "appidacr"]
set idp [CkJsonObject_stringOf $jsonIdToken "idp"]
set oid [CkJsonObject_stringOf $jsonIdToken "oid"]
set sid [CkJsonObject_stringOf $jsonIdToken "sid"]
set s_sub [CkJsonObject_stringOf $jsonIdToken "sub"]
set tid [CkJsonObject_stringOf $jsonIdToken "tid"]
set uti [CkJsonObject_stringOf $jsonIdToken "uti"]
set ver [CkJsonObject_stringOf $jsonIdToken "ver"]

delete_CkSocket $socket
delete_CkAuthAzureAD $azureAD
delete_CkJsonObject $json
delete_CkFileAccess $fac
delete_CkStringArray $sa
delete_CkStringBuilder $sbIdToken
delete_CkJsonObject $jsonIdToken

 

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