Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

VB.NET Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Code Signing
Compression
DKIM / DomainKey
DNS
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
Misc
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(VB.NET) Get E-way Bill System Access Token

Sends a request to get an E-way bill system access token.

Chilkat .NET Downloads

Chilkat .NET Assemblies

Chilkat for .NET Core

Chilkat for Mono

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


'  First load the public key provided by the E-way bill System
Dim pubkey As New Chilkat.PublicKey
Dim success As Boolean = pubkey.LoadFromFile("qa_data/pem/eway_publickey.pem")
If (success <> True) Then
    Debug.WriteLine(pubkey.LastErrorText)
    Exit Sub
End If


'  Encrypt the password using the RSA public key provided by eway..
Dim password As String = "my_wepgst_password"
Dim rsa As New Chilkat.Rsa
rsa.Charset = "utf-8"
rsa.EncodingMode = "base64"

success = rsa.ImportPublicKeyObj(pubkey)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


'  Returns the encrypted password as base64 (because the EncodingMode = "base64")
Dim encPassword As String = rsa.EncryptStringENC(password,False)
If (rsa.LastMethodSuccess <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


'  Generate a random app_key.  This should be 32 bytes (us-ascii chars)
'  We need 32 bytes because we'll be doing 256-bit AES ECB encryption, and 32 bytes = 256 bits.
Dim prng As New Chilkat.Prng
'  Generate a random string containing some numbers, uppercase, and lowercase.
Dim app_key As String = prng.RandomString(32,True,True,True)

Debug.WriteLine("app_key = " & app_key)

'  RSA encrypt the app_key.
Dim encAppKey As String = rsa.EncryptStringENC(app_key,False)
If (rsa.LastMethodSuccess <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


'  Prepare the JSON body for the HTTP POST that gets the access token.
Dim jsonBody As New Chilkat.JsonObject
jsonBody.UpdateString("action","ACCESSTOKEN")
'  Use your username instead of "09ABDC24212B1FK".
jsonBody.UpdateString("username","09ABDC24212B1FK")
jsonBody.UpdateString("password",encPassword)
jsonBody.UpdateString("app_key",encAppKey)

Dim http As New Chilkat.Http

'  Add required headers.
'  Use your ewb-user-id instead of "03AEXPR16A9M010"
http.SetRequestHeader("ewb-user-id","03AEXPR16A9M010")
'  The Gstin should be the same as the username in the jsonBody above.
http.SetRequestHeader("Gstin","09ABDC24212B1FK")
http.Accept = "application/json"

'  POST the JSON...
Dim resp As Chilkat.HttpResponse = http.PostJson2("http://ewb.wepgst.com/api/Authenticate","application/json",jsonBody.Emit())
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim respStatusCode As Integer = resp.StatusCode
Debug.WriteLine("response status code =" & respStatusCode)
Debug.WriteLine("response body:")
Debug.WriteLine(resp.BodyStr)

If (respStatusCode <> 200) Then

    Debug.WriteLine("Failed in some unknown way.")
    Exit Sub
End If


'  When the response status code = 200, we'll have either
'  success response like this:
'   {"status":"1","authtoken":"...","sek":"..."}
' 
'  or a failed response like this:
' 
'  {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}

'  Load the response body into a JSON object.
Dim json As New Chilkat.JsonObject
json.Load(resp.BodyStr)


Dim status As Integer = json.IntOf("status")
Debug.WriteLine("status = " & status)

If (status <> 1) Then
    '  Failed.  Base64 decode the error
    ' {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
    '  For an invalid password, the error is: {"errorCodes":"108"}
    Dim sbError As New Chilkat.StringBuilder
    json.StringOfSb("error",sbError)
    sbError.Decode("base64","utf-8")
    Debug.WriteLine("error: " & sbError.GetAsString())
    Exit Sub
End If


'  At this point, we know the request was entirely successful.
Dim authToken As String = json.StringOf("authtoken")

'  Decrypt the sek key using our app_key.
Dim crypt As New Chilkat.Crypt2
crypt.CryptAlgorithm = "aes"
crypt.CipherMode = "ecb"
crypt.KeyLength = 256
crypt.SetEncodedKey(app_key,"us-ascii")
crypt.EncodingMode = "base64"

Dim bdSek As New Chilkat.BinData
bdSek.AppendEncoded(json.StringOf("sek"),"base64")
crypt.DecryptBd(bdSek)

'  bdSek now contains the decrypted symmetric encryption key...
'  We'll use it to encrypt the JSON payloads we send.

'  Let's persist our authtoken and decrypted sek (symmetric encryption key).
'  To send EWAY requests (such as to create an e-way bill), we'll just load
'  and use these pre-obtained credentials.
Dim jsonEwayAuth As New Chilkat.JsonObject
jsonEwayAuth.UpdateString("authToken",authToken)
jsonEwayAuth.UpdateString("decryptedSek",bdSek.GetEncoded("base64"))
jsonEwayAuth.EmitCompact = False

Dim fac As New Chilkat.FileAccess
fac.WriteEntireTextFile("qa_data/tokens/ewayAuth.json",jsonEwayAuth.Emit(),"utf-8",False)

Debug.WriteLine("Saved:")
Debug.WriteLine(jsonEwayAuth.Emit())

'  Sample output:
'  {
'    "authToken": "IBTeFtxNfVurg71LTzZ2r0xK7",
'    "decryptedSek": "5g1TyTie7yoslU3DrbYATa7mWyPazlODE7cEh5Vy4Ho="
'  }

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.