Tickets :: Comment on [#2782] S/MIME Sign using browser capabilities

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Comment	>>> Wouldn't you consider the AJAX alternative? > >> Of course, but why would the help with the splitting of message > >> building and sending? > >>> I could send you the changes so far as patched. > >> Sure, talking about some real code is always easier. > > I don't know if you are interested in code details. > > So I prepared a Brief and an Extended version, > > both for AJAX and Without AJAX. > > The extended version helps me to organize myself > > (and also document these changes). > > Here is the flow control of composing, singning and sending a message > > the way I know today. > > > > Without AJAX: > > ~~~~~~~~~~~~~ > > Brief: > > ------ > > 1) Submit the form as usual. > > 2) Build a text/plain MIME for each recipient. > > 3) Marshall return values as form hidden inputs. > > 4) Render the compose page again. > > 5) Hook on onload event to sign text/plain MIMES. > > 6) ReSubmit this form. > > 7) Unmarshall submitted form hidden inputs to carry on. > > 8) Build a multipart/signed for each pair of (text/plain, signature) > > 9) Now send all as usual. > > > > Extended: > > --------- > > 1) Send the form. > > > > The page is loaded, the compose form is fulfilled, and submitted > > with actionID="send-message'. > > > > 2) Build a text/plain MIME for each recipient. > > > > /imp/compose.php is called, the following code is executed > > > > case 'send_message': > > ... > > $imp_compose->buildAndSendMessage(...); > > > > My goal is to split this function in two, because I need to sing > > in the browser between "build" and "send". > > Right now, the patch I sent "composed" the text/plain part of the MIME > > in a Javascript function. > > I should leave that to the "build" part of this function. > > So, I need 2 new functions: > > /imp/lib/Compose.php::buildMessage() > > /imp/lib/Compose.php::sendMessage() > > The original buildAndSendMessage() is kept for backwards compatibility > > and calls these two new ones. > > I have done this refactoring and the coupling between these is strong. > > Many parameters and array of return values. > > > > function buildAndSendMessage(<original parameters>) > > { > > list($messagesToSend, $recipients, $messageToSave) = > > $this->buildMessage(<original parameters>); > > /** > > * Vars in the list() is the coupling between buildMessage() > > * and sendMessage() > > / > > $sent_saved = $this->sendMessages($messagesToSend, $recipients, > > $messageToSave, <original parameters>); > > return $sent_saved; > > } > > > > Besides, buildMessage() does some work if there are multiple recipients > > when signing, so <signing flag> so say "true": > > > > if (<signing flag>) { > > / Must encrypt & send the message one recipient at a time. / > > foreach ($recipientArray as $val) { > > $res = $this->_createMimeMessage(array($val), $body, $encrypt); > > ... > > } > > ... > > } > > > > Here, buildMessage() calls _createMimeMessage(), one for each recipient. > > _createMimeMessage() is exactly the piece of code I want to replace the > > Javascript with. However, this function also encrypts, wich I don't > need right > > now since encryption is carried out later on the browser. > > I just want it to compose the text/plain part. > > > > function _createMimeMessage($to, $body, $encrypt) > > { > > ... > > <mostly encryption code> > > ... > > / Add data to MIME_Message object. / > > $mime_message->addPart($body);\ > > ... > > return array('recipients' => $to, > > 'to' => implode(', ', $to), > > 'msg' => &$mime_message); > > } > > > > 3) Marshall return values as form hidden inputs. > > > > When all this calls return, I have to break the switch statement at > > /imp/compose.php. > > > > Right here I have an array of 3 values returned from buildMessage(); > > > > > > function buildMessage(...) > > { > > ... > > return array($messagesToSend, $recipients, $messageToSave); > > } > > > > list($messagesToSend, $recipients, $messageToSave) = buildMessage(); > > > > In the original normal flow of actionID='send_message' these 3 values > > are needed by the following lines of code of this switch case. > > But now, I must break the flow and show the compose form again > > with these 3 values rendered in the form as hidden inputs. > > This task is not pretty. For example, $messagesToSend is an array of > 3 objects, > > one of them is an IMP_MIME wich I have to transform toCanonicalString(). > > I have not completed this marshalling yet, $recipients and $messageToSave > > are missing. Here is a bit of code from /imp/compose.php: > > > > / Prepare the messages in the form to be signed in browser / > > if (isset($messagesToSend)) { > > $canonical_mimes = array(); > > foreach ($messagesToSend as $mime_message ) > > $canonical_mimes[] = $mime_message['msg']->toCanonicalString(); > > $t->set('messagesToSend', $canonical_mimes); > > } > > > > 4) Render the compose page again. > > > > This is done in /imp/templates/compose/compose.html: > > > > <!-- These are the MIMEs to be signed --> > > <loop:messagesToSend> > > <input type="hidden" name="messagesToSend" value="<tag:messagesToSend />" /> > > </loop:messagesToSend> > > > > Wich should write some hmtl code like this: > > > > <input type="hidden" name="messagesToSend" value="Content-type: > text/plain ..." /> > > <input type="hidden" name="messagesToSend" value="Content-type: > text/plain ..." /> > > <input type="hidden" name="recipients" value="..." /> > > <input type="hidden" name="messageToSave" value="..." /> > > > > I am missing all code from here. It is not in the patch I attached just now. > > 5) Hook on onload event to sign text/plain MIMES. > > > > With all of this values on the form, I have to hook page onload event > > to fire the javascript that takes the text/plain messagesToSend and > signs them. > > > > 6) ReSubmit this form. > > > > 7) Unmarshall submitted form hidden inputs to carry on. > > > > The switch structure on /imp/compose.php now looks like this: > > > > case 'send_message': > > case 'compose_mime': > > ... > > if ($actionID == 'compose_mime') { > > $marshall_all_this = $imp_compose->buildMessage(...); > > break; > > } > > > > case 'send_mime': > > > > if ($actionID == 'send_mime') { > > / We are coming from a form submit / > > $unmarshalled_values = not_implemented_yet(<Util::getFormData()>); > > $sent = $imp_compose->sendMessages($unmarshalled_values); > > } else { > > / The switch case did not break, so al usual variables are > available */ > > $sent = $imp_compose->buildAndSendMessage(<usual parameters>); > > } > > > > 8) Build a multipart/signed for each pair of (text/plain, signature) > > > > Here's another problem, since now I would need to call buildMessage() again, > > so a multipart/signed is composed with every signed text/plain. > > Remember, we already called it to compose the text/plain. > > > > 9) Now send all as usual. > > > > With the multipart/signed already composed, now I can send the messages > > calling the refactored sendMessages(). > > But before I have to re-construct the parameters we stored as hiddens > > in the form to pass them to this functions. Another not pretty task. > > > > If all this succeeds, the messages are sent as multipart/signed. > > > > The AJAX way: > > ~~~~~~~~~~~~~ > > Introduction: > > ------------- > > I have written no code at all at this time. I have little experience > > with AJAX, so maybe some of this can't be done the way I wished. > > This approach should mean very little PHP code changes, plus a better > > user experience. I am going to need much advise on how to embed Ajax > > in the PHP templates, if this strategy is finally accepted. > > > > Brief: > > ------ > > 1) Fire the javascript signing function on form submit. > > 2) Call imp/lib/Compose.php::IMP_Compose::_createMimeMessage($to, > $body, $encrypt) > > via Ajax to compose text/plain MIME(s if multiple recipients). > > 3) Sign the text/plain part returned by the Ajax call. > > 4) Set the signature(s if multiple recipients) as hidden inputs. > > 5) Submit this form with actionID='send_message'. > > > > Extended: > > --------- > > > > 1) Fire the javascript signing function on form submit. > > > > This change is already in the first patch. uniqSubmit() function > > calls signMessage() if singning has been requested by selecting it > > in the drop-down list. > > > > 2) Call imp/lib/Compose.php::IMP_Compose::_createMimeMessage($to, > $body, $encrypt) > > via Ajax to compose text/plain MIME(s if multiple recipients). > > > > To sign the message we need the message itself as a text/plain MIME. > > This is provided by the PHP server side by wrapping the call to > > class IMP_Compose. We need to expose _createMimeMessage() method to return > > one or multiple text/plain MIMEs depending on how many recipients there are. > > > > 3) Sign the text/plain part returned by the Ajax call. > > & 4) Set the signature(s if multiple recipients) as hidden inputs. > > > > I sign each text/plain part we retrieved by AJAX, storing each > > signature as a form hidden input. > > > > 5) Submit this form with actionID='send_message'. > > > > Just go on and submit the form as usual. > > Do not encrypt when buildAndSendMessage() calls _createMimeMessage(), > > just compose the multipart/signed with the signature provided. > > This change is already on the first patch (how do you reference different > > patches so not to bring confusion, do you number/timestamp them?). > > > > Feel free to correct my English. In fact, I would appreciate it. > > > > Thanks, > > > > Mariano. > >
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