(PowerBuilder) IMAP Download and Verify Signed MIME

Downloads the unmodified MIME of a digitally signed email, saves the .p7s signature (and other MIME parts), then loads the email into a Chilkat email object (which unwraps the S/MIME and verifies the signature) and then saves attachments (if the MIME parts were not already saved).

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

integer li_rc
oleobject loo_Imap
integer li_Success
oleobject loo_SbMime
oleobject loo_Mime
integer li_AlreadySavedParts
oleobject loo_Sa
integer li_NumFiles
integer i
oleobject loo_Email
oleobject loo_Cert

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

loo_Imap = create oleobject
// Use "Chilkat_9_5_0.Imap" for versions of Chilkat < 10.0.0
li_rc = loo_Imap.ConnectToNewObject("Chilkat.Imap")
if li_rc < 0 then
    destroy loo_Imap
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Connect to an IMAP server.
// Use TLS
loo_Imap.Ssl = 1
loo_Imap.Port = 993
li_Success = loo_Imap.Connect("imap.someMailServer.com")
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

li_Success = loo_Imap.Login("myLogin","myPassword")
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Select an IMAP mailbox
li_Success = loo_Imap.SelectMailbox("Inbox")
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Download the 1st email (as MIME) in the Inbox by sequence number.
loo_SbMime = create oleobject
// Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
li_rc = loo_SbMime.ConnectToNewObject("Chilkat.StringBuilder")

li_Success = loo_Imap.FetchSingleAsMimeSb(1,0,loo_SbMime)
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    destroy loo_SbMime
    return
end if

// Load it into a MIME object and check to see if it is signed
loo_Mime = create oleobject
// Use "Chilkat_9_5_0.Mime" for versions of Chilkat < 10.0.0
li_rc = loo_Mime.ConnectToNewObject("Chilkat.Mime")

loo_Mime.LoadMimeSb(loo_SbMime)
li_AlreadySavedParts = 0
if loo_Mime.ContainsSignedParts() = 1 then

    // This will save the .p7s and other parts...
    loo_Sa = loo_Mime.ExtractPartsToFiles("qa_output")
    if loo_Mime.LastMethodSuccess = 1 then
        li_NumFiles = loo_Sa.Count
        i = 0
        do while i < li_NumFiles
            Write-Debug "Created: " + loo_Sa.GetString(i)
            i = i + 1
        loop
        destroy loo_Sa
        li_AlreadySavedParts = 1
    end if

end if

// Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
loo_Email = create oleobject
// Use "Chilkat_9_5_0.Email" for versions of Chilkat < 10.0.0
li_rc = loo_Email.ConnectToNewObject("Chilkat.Email")

loo_Email.SetFromMimeSb(loo_SbMime)

if loo_Email.ReceivedSigned = 1 then

    Write-Debug "This email was signed."

    // Check to see if the signatures were verified.
    if loo_Email.SignaturesValid = 1 then
        Write-Debug "Digital signature(s) verified."

        Write-Debug "Signer: " + loo_Email.SignedBy

        // The certificate used for signing may be obtained
        // by calling email.GetSignedByCert.
        loo_Cert = loo_Email.GetSignedByCert()
        if loo_Email.LastMethodSuccess <> 1 then
            Write-Debug "Failed to get signing certificate object."
        else
            Write-Debug "Signing cert: " + loo_Cert.SubjectCN
            destroy loo_Cert
        end if

    end if

else
    Write-Debug "Digital signature verification failed."
end if

if li_AlreadySavedParts <> 1 then
    loo_Email.SaveAllAttachments("qa_output")
end if



destroy loo_Imap
destroy loo_SbMime
destroy loo_Mime
destroy loo_Email