(DataFlex) IMAP Download and Verify Signed MIME

Downloads the original MIME of a digitally signed email and saves the .p7s signature along with other MIME parts. It then imports the email into a Chilkat email object to unwrap the S/MIME and verify the signature, and subsequently saves the attachments if they haven't been saved already.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoImap
    Variant vSbMime
    Handle hoSbMime
    Handle hoMime
    Boolean iAlreadySavedParts
    Variant vSt
    Handle hoSt
    Integer iNumFiles
    Integer i
    Handle hoEmail
    Variant vCert
    Handle hoCert
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatImap)) To hoImap
    If (Not(IsComObjectCreated(hoImap))) Begin
        Send CreateComObject of hoImap
    End

    // Connect to an IMAP server.
    // Use TLS
    Set ComSsl Of hoImap To True
    Set ComPort Of hoImap To 993
    Get ComConnect Of hoImap "imap.example.com" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComLogin Of hoImap "myLogin" "myPassword" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Select an IMAP mailbox
    Get ComSelectMailbox Of hoImap "Inbox" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Download the 1st email (as MIME) in the Inbox by sequence number.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbMime
    If (Not(IsComObjectCreated(hoSbMime))) Begin
        Send CreateComObject of hoSbMime
    End
    Get pvComObject of hoSbMime to vSbMime
    Get ComFetchSingleAsMimeSb Of hoImap 1 False vSbMime To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Load it into a MIME object and check to see if it is signed
    Get Create (RefClass(cComChilkatMime)) To hoMime
    If (Not(IsComObjectCreated(hoMime))) Begin
        Send CreateComObject of hoMime
    End
    Get pvComObject of hoSbMime to vSbMime
    Get ComLoadMimeSb Of hoMime vSbMime To iSuccess
    Move False To iAlreadySavedParts
    Get ComContainsSignedParts Of hoMime To bTemp1
    If (bTemp1 = True) Begin

        // This will save the .p7s and other parts...
        Get Create (RefClass(cComChilkatStringTable)) To hoSt
        If (Not(IsComObjectCreated(hoSt))) Begin
            Send CreateComObject of hoSt
        End
        Get pvComObject of hoSt to vSt
        Get ComPartsToFiles Of hoMime "c:/temp/qa_output" vSt To iSuccess
        If (iSuccess = True) Begin
            Get ComCount Of hoSt To iNumFiles
            Move 0 To i
            While (i < iNumFiles)
                Get ComStringAt Of hoSt i To sTemp1
                Showln "Created: " sTemp1
                Move (i + 1) To i
            Loop

            Move True To iAlreadySavedParts
        End

    End

    // Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End
    Get pvComObject of hoSbMime to vSbMime
    Get ComSetFromMimeSb Of hoEmail vSbMime To iSuccess

    Get ComReceivedSigned Of hoEmail To bTemp1
    If (bTemp1 = True) Begin

        Showln "This email was signed."

        // Check to see if the signatures were verified.
        Get ComSignaturesValid Of hoEmail To bTemp1
        If (bTemp1 = True) Begin
            Showln "Digital signature(s) verified."

            Get ComSignedBy Of hoEmail To sTemp1
            Showln "Signer: " sTemp1

            // The certificate used for signing may be obtained
            // by calling email.GetSignedByCert.
            Get Create (RefClass(cComChilkatCert)) To hoCert
            If (Not(IsComObjectCreated(hoCert))) Begin
                Send CreateComObject of hoCert
            End
            Get pvComObject of hoCert to vCert
            Get ComLastSignerCert Of hoEmail i vCert To iSuccess
            If (iSuccess = False) Begin
                Showln "Failed to get signing certificate object."
            End
            Else Begin
                Get ComSubjectCN Of hoCert To sTemp1
                Showln "Signing cert: " sTemp1
            End

        End

    End
    Else Begin
        Showln "Digital signature verification failed."
    End

    If (iAlreadySavedParts <> True) Begin
        Get ComSaveAllAttachments Of hoEmail "c:/temp/qa_output" To iSuccess
    End



End_Procedure