(Excel) bitzlato.com whoami

Demonstrates sending a request to the bitzlato.com whoami endpoint using an ES256 JWT token for authentication.

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

'  Use the following ECC key loaded from JWK format.
Dim jwk As Chilkat.JsonObject
Set jwk = Chilkat.NewJsonObject
success = jwk.UpdateString("kty","EC")
success = jwk.UpdateString("crv","P-256")
success = jwk.UpdateString("x","...")
success = jwk.UpdateString("y","...")
success = jwk.UpdateString("d","...")

Dim eccKey As Chilkat.PrivateKey
Set eccKey = Chilkat.NewPrivateKey
success = eccKey.LoadJwk(jwk.Emit())
If (success = False) Then
    Debug.Print eccKey.LastErrorText
    Exit Sub
End If

Dim jwt As Chilkat.Jwt
Set jwt = Chilkat.NewJwt

' Build the JOSE header
Dim jose As Chilkat.JsonObject
Set jose = Chilkat.NewJsonObject
success = jose.AppendString("format","compact")
success = jose.AppendString("alg","ES256")

' Now build the JWT claims (also known as the payload)

' Our JWT claims will contain members as shown here:

' 	{
' 	  "email":"your_email@example.com",
' 	  "aud":"usr",
' 	  "iat":"1588286154",
' 	  "jti":"555D9123"
' 	}

Dim claims As Chilkat.JsonObject
Set claims = Chilkat.NewJsonObject
Dim success As Boolean
success = claims.AppendString("jti","555D9123")
success = claims.AppendString("email","your_email@example.com")

' Set the timestamp of when the JWT was created to now minus 60 seconds

curDateTime = jwt.GenNumericDate(-60)
success = claims.AddIntAt(-1,"iat",curDateTime)

' Set the "not process before" timestamp to now minus 60 seconds
success = claims.AddIntAt(-1,"nbf",curDateTime)

' Set the timestamp defining an expiration time (end time) for the token
' to be now + 1 hour (3600 seconds)
success = claims.AddIntAt(-1,"exp",curDateTime + 3600)

success = claims.AppendString("aud","usr")

' Produce the smallest possible JWT:
jwt.AutoCompact = True

' Create the JWT token.  This is where the RSA signature is created.

jwt_token = jwt.CreateJwtPk(jose.Emit(),claims.Emit(),eccKey)

Debug.Print jwt_token

' Send the HTTPS GET with the jwt_token used for Authorization.
Dim http As Chilkat.Http
Set http = Chilkat.NewHttp
http.AuthToken = jwt_token

responseStr = http.QuickGetStr("https://bitzlato.com/api/auth/whoami")
If (http.LastMethodSuccess = False) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Debug.Print "status code = "; http.LastStatus
Debug.Print responseStr