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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _MIMECRYP_H_
#define _MIMECRYP_H_

#include "mimecont.h"
// #include "mimeenc.h"
#include "modmimee.h"
#include "mimepbuf.h"

/* The MimeEncrypted class implements a type of MIME object where the object
   is passed to some other routine, which then returns a new MIME object.
   This is the basis of a decryption module.

   Oddly, this class behaves both as a container and as a leaf: it acts as a
   container in that it parses out data in order to eventually present a
   contained object; however, it acts as a leaf in that this container may
   itself have a Content-Transfer-Encoding applied to its body.  This violates
   the cardinal rule of MIME containers, which is that encodings don't nest,
   and therefore containers can't have encodings.  But, the fact that the
   S/MIME spec doesn't follow the groundwork laid down by previous MIME specs
   isn't something we can do anything about at this point...

   Therefore, this class duplicates some of the work done by the MimeLeaf
   class, to meet its dual goals of container-hood and leaf-hood.  (We could
   alternately have made this class be a subclass of leaf, and had it duplicate
   the effort of MimeContainer, but that seemed like the harder approach.)

   The MimeEncrypted class provides the following methods:

   void *crypto_init(MimeObject *obj,
           int (*output_fn) (const char *data, int32 data_size,
                     void *output_closure),
           void *output_closure)

     This is called with the MimeObject representing the encrypted data.
   The obj->headers should be used to initialize the decryption engine.
   NULL indicates failure; otherwise, an opaque closure object should
   be returned.

   output_fn is what the decryption module should use to write a new MIME
   object (the decrypted data.)  output_closure should be passed along to
   every call to the output routine.

   The data sent to output_fn should begin with valid MIME headers indicating
   the type of the data.  For example, if decryption resulted in a text
   document, the data fed through to the output_fn might minimally look like

        Content-Type: text/plain

        This is the decrypted data.
        It is only two lines long.

     Of course, the data may be of any MIME type, including multipart/mixed.
   Any returned MIME object will be recursively processed and presented
   appropriately.  (This also imples that encrypted objects may nest, and
   thus that the underlying decryption module must be reentrant.)

   int crypto_write (const char *data, int32 data_size, void *crypto_closure)

     This is called with the raw encrypted data.  This data might not come
   in line-based chunks: if there was a Content-Transfer-Encoding applied
   to the data (base64 or quoted-printable) then it will have been decoded
   first (handing binary data to the filter_fn.)  `crypto_closure' is the
   object that `crypto_init' returned.  This may return negative on error.

   int crypto_eof (void *crypto_closure, bool abort_p)

     This is called when no more data remains.  It may call `output_fn' again
   to flush out any buffered data.  If `abort_p' is true, then it may choose
   to discard any data rather than processing it, as we're terminating

   char * crypto_generate_html (void *crypto_closure)

     This is called after `crypto_eof' but before `crypto_free'.  The crypto
   module should return a newly-allocated string of HTML code which
   explains the status of the decryption to the user (whether the signature
   checked out, etc.)

   void crypto_free (void *crypto_closure)

     This will be called when we're all done, after `crypto_eof' and
   `crypto_emit_html'.  It is intended to free any data represented
   by the crypto_closure.  output_fn may not be called.

   int (*parse_decoded_buffer) (const char *buf, int32 size, MimeObject *obj)

     This method, of the same name as one in MimeLeaf, is a part of the
   afforementioned leaf/container hybridization.  This method is invoked
   with the content-transfer-decoded body of this part (without line
   buffering.)  The default behavior of this method is to simply invoke
   `crypto_write' on the data with which it is called.  It's unlikely that
   a subclass will need to specialize this.

typedef struct MimeEncryptedClass MimeEncryptedClass;
typedef struct MimeEncrypted      MimeEncrypted;

struct MimeEncryptedClass {
  MimeContainerClass container;

  /* Duplicated from MimeLeaf, see comments above.
     This is the callback that is handed to the decoder. */
  int (*parse_decoded_buffer) (const char *buf, int32_t size, MimeObject *obj);

  /* Callbacks used by decryption module. */
  void * (*crypto_init) (MimeObject *obj,
             int (*output_fn) (const char *data, int32_t data_size,
                       void *output_closure),
             void *output_closure);
  int (*crypto_write) (const char *data, int32_t data_size,
             void *crypto_closure);
  int (*crypto_eof) (void *crypto_closure, bool abort_p);
  char * (*crypto_generate_html) (void *crypto_closure);
  void (*crypto_free) (void *crypto_closure);

extern MimeEncryptedClass mimeEncryptedClass;

struct MimeEncrypted {
  MimeContainer container;     /* superclass variables */
  void *crypto_closure;       /* Opaque data used by decryption module. */
  MimeDecoderData *decoder_data; /* Opaque data for the Transfer-Encoding
                  decoder. */
  MimeHeaders *hdrs;       /* Headers of the enclosed object (including
                  the type of the *decrypted* data.) */
  MimePartBufferData *part_buffer;  /* The data of the decrypted enclosed
                     object (see mimepbuf.h) */

#define MimeEncryptedClassInitializer(ITYPE,CSUPER) \
  { MimeContainerClassInitializer(ITYPE,CSUPER) }

#endif /* _MIMECRYP_H_ */