PyObject *
CCNObject_New(enum _pyccn_capsules type, void *pointer)
{
PyObject *capsule;
int r;
assert(pointer);
capsule = PyCapsule_New(pointer, type2name(type), pyccn_Capsule_Destructor);
if (!capsule)
return NULL;
switch (type) {
case CONTENT_OBJECT:
{
struct content_object_data *context;
context = calloc(1, sizeof(*context));
JUMP_IF_NULL_MEM(context, error);
r = PyCapsule_SetContext(capsule, context);
if (r < 0) {
free(context);
goto error;
}
break;
}
case INTEREST:
{
struct interest_data *context;
context = calloc(1, sizeof(*context));
JUMP_IF_NULL_MEM(context, error);
r = PyCapsule_SetContext(capsule, context);
if (r < 0) {
free(context);
goto error;
}
break;
}
default:
break;
}
return capsule;
error:
Py_XDECREF(capsule);
return NULL;
}
struct ccn_parsed_interest *
_pyccn_interest_get_pi(PyObject *py_interest)
{
struct interest_data *context;
struct ccn_charbuf *interest;
int r;
assert(CCNObject_IsValid(INTEREST, py_interest));
context = PyCapsule_GetContext(py_interest);
assert(context);
if (context->pi)
return context->pi;
interest = CCNObject_Get(INTEREST, py_interest);
context->pi = calloc(1, sizeof(struct ccn_parsed_interest));
JUMP_IF_NULL_MEM(context->pi, error);
/* TODO: we should also use the comps argument */
r = ccn_parse_interest(interest->buf, interest->length, context->pi, NULL);
if (r < 0) {
PyErr_SetString(g_PyExc_CCNInterestError, "Unable to parse the"
" Interest");
goto error;
}
assert(context->pi);
return context->pi;
error:
return NULL;
}
static int
parse_ContentObject(PyObject *py_content_object)
{
struct content_object_data *context;
struct ccn_charbuf *content_object;
int r;
assert(CCNObject_IsValid(CONTENT_OBJECT, py_content_object));
context = PyCapsule_GetContext(py_content_object);
assert(context);
if (context->pco)
free(context->pco);
ccn_indexbuf_destroy(&context->comps);
/*
* no error happens between deallocation and following line, so I'm not
* setting context->pco to NULL
*/
context->pco = calloc(1, sizeof(struct ccn_parsed_ContentObject));
JUMP_IF_NULL_MEM(context->pco, error);
context->comps = ccn_indexbuf_create();
JUMP_IF_NULL_MEM(context->comps, error);
content_object = CCNObject_Get(CONTENT_OBJECT, py_content_object);
r = ccn_parse_ContentObject(content_object->buf, content_object->length,
context->pco, context->comps);
if (r < 0) {
PyErr_SetString(g_PyExc_CCNContentObjectError, "Unable to parse the"
" ContentObject");
goto error;
}
return 0;
error:
if (context->pco) {
free(context->pco);
context->pco = NULL;
}
ccn_indexbuf_destroy(&context->comps);
return -1;
}
PyObject *
_pyndn_cmd_KeyLocator_to_ndn(PyObject *UNUSED(self), PyObject *args,
PyObject *kwds)
{
static char *kwlist[] = {"name", "digest", "key", "cert", NULL};
PyObject *py_name = Py_None, *py_digest = Py_None, *py_key = Py_None,
*py_cert = Py_None;
struct ndn_charbuf *keylocator;
int r;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OOOO", kwlist, &py_name,
&py_digest, &py_key, &py_cert))
return NULL;
keylocator = ndn_charbuf_create();
JUMP_IF_NULL_MEM(keylocator, error);
r = ndn_charbuf_append_tt(keylocator, NDN_DTAG_KeyLocator, NDN_DTAG);
JUMP_IF_NEG_MEM(r, error);
if (py_name != Py_None) {
//TODO: add digest as well
r = KeyLocator_name_to_ndn(keylocator, py_name);
JUMP_IF_NEG(r, error);
} else if (py_key != Py_None) {
r = KeyLocator_key_to_ndn(keylocator, py_key);
JUMP_IF_NEG(r, error);
} else if (py_cert != Py_None) {
#if 0
ndn_charbuf_append_tt(keylocator, NDN_DTAG_Certificate, NDN_DTAG);
// TODO: How to handle certificate? ** Not supported here
ndn_charbuf_append_closer(keylocator); /* </Certificate> */
#endif
PyErr_SetString(PyExc_NotImplementedError, "Certificate key locator is"
" not implemented");
goto error;
}
r = ndn_charbuf_append_closer(keylocator); /* </KeyLocator> */
JUMP_IF_NEG_MEM(r, error);
return NDNObject_New(KEY_LOCATOR, keylocator);
error:
ndn_charbuf_destroy(&keylocator);
return NULL;
}
PyObject *
_pyccn_cmd_encode_ContentObject(PyObject *UNUSED(self), PyObject *args)
{
PyObject *py_content_object, *py_name, *py_content, *py_signed_info,
*py_key;
PyObject *py_o = NULL, *ret = NULL;
struct ccn_charbuf *name, *signed_info, *content_object = NULL;
struct ccn_pkey *private_key;
const char *digest_alg = NULL;
char *content;
Py_ssize_t content_len;
int r;
if (!PyArg_ParseTuple(args, "OOOOO", &py_content_object, &py_name,
&py_content, &py_signed_info, &py_key))
return NULL;
if (strcmp(py_content_object->ob_type->tp_name, "ContentObject")) {
PyErr_SetString(PyExc_TypeError, "Must pass a ContentObject as arg 1");
return NULL;
}
if (!CCNObject_IsValid(NAME, py_name)) {
PyErr_SetString(PyExc_TypeError, "Must pass a CCN Name as arg 2");
return NULL;
} else
name = CCNObject_Get(NAME, py_name);
if (py_content != Py_None && !PyBytes_Check(py_content)) {
PyErr_SetString(PyExc_TypeError, "Must pass a Bytes as arg 3");
return NULL;
} else if (py_content == Py_None) {
content = NULL;
content_len = 0;
} else {
r = PyBytes_AsStringAndSize(py_content, &content, &content_len);
if (r < 0)
return NULL;
}
if (!CCNObject_IsValid(SIGNED_INFO, py_signed_info)) {
PyErr_SetString(PyExc_TypeError, "Must pass a CCN SignedInfo as arg 4");
return NULL;
} else
signed_info = CCNObject_Get(SIGNED_INFO, py_signed_info);
if (strcmp(py_key->ob_type->tp_name, "Key")) {
PyErr_SetString(PyExc_TypeError, "Must pass a Key as arg 4");
return NULL;
}
// DigestAlgorithm
py_o = PyObject_GetAttrString(py_content_object, "digestAlgorithm");
if (py_o != Py_None) {
PyErr_SetString(PyExc_NotImplementedError, "non-default digest"
" algorithm not yet supported");
goto error;
}
Py_CLEAR(py_o);
// Key
private_key = Key_to_ccn_private(py_key);
// Note that we don't load this key into the keystore hashtable in the library
// because it makes this method require access to a ccn handle, and in fact,
// ccn_sign_content just uses what's in signedinfo (after an error check by
// chk_signing_params and then calls ccn_encode_ContentObject anyway
//
// Encode the content object
// Build the ContentObject here.
content_object = ccn_charbuf_create();
JUMP_IF_NULL_MEM(content_object, error);
r = ccn_encode_ContentObject(content_object, name, signed_info, content,
content_len, digest_alg, private_key);
debug("ccn_encode_ContentObject res=%d\n", r);
if (r < 0) {
ccn_charbuf_destroy(&content_object);
PyErr_SetString(g_PyExc_CCNError, "Unable to encode ContentObject");
goto error;
}
ret = CCNObject_New(CONTENT_OBJECT, content_object);
error:
Py_XDECREF(py_o);
return ret;
}
PyObject *
_pyccn_cmd_SignedInfo_to_ccn(PyObject *UNUSED(self), PyObject *args,
PyObject *kwds)
{
static char *kwlist[] = {"pubkey_digest", "type", "timestamp",
"freshness", "final_block_id", "key_locator", NULL};
PyObject *py_pubkey_digest, *py_timestamp = Py_None,
*py_final_block = Py_None, *py_key_locator = Py_None;
struct ccn_charbuf *si;
PyObject *py_si;
int r;
size_t publisher_key_id_size;
const void *publisher_key_id;
int type, freshness = -1;
struct ccn_charbuf *timestamp = NULL, *finalblockid = NULL,
*key_locator = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "Oi|OiOO", kwlist,
&py_pubkey_digest, &type, &py_timestamp, &freshness,
&py_final_block, &py_key_locator))
return NULL;
if (!PyBytes_Check(py_pubkey_digest)) {
PyErr_SetString(PyExc_TypeError, "Must pass a Bytes as pubkey_digest");
return NULL;
} else {
publisher_key_id_size = PyBytes_GET_SIZE(py_pubkey_digest);
publisher_key_id = PyBytes_AS_STRING(py_pubkey_digest);
}
if (py_timestamp != Py_None) {
PyErr_SetString(PyExc_NotImplementedError, "Timestamp is not implemented yet");
return NULL;
} else
timestamp = NULL;
if (py_final_block != Py_None) {
char *s;
Py_ssize_t len;
if (!PyBytes_Check(py_final_block)) {
PyErr_SetString(PyExc_TypeError, "Must pass a bytes as final block");
return NULL;
}
finalblockid = ccn_charbuf_create();
JUMP_IF_NULL_MEM(finalblockid, error);
s = PyBytes_AS_STRING(py_final_block);
len = PyBytes_GET_SIZE(py_final_block);
r = ccn_charbuf_append_tt(finalblockid, len, CCN_BLOB);
JUMP_IF_NEG_MEM(r, error);
r = ccn_charbuf_append(finalblockid, s, len);
JUMP_IF_NEG_MEM(r, error);
} else
finalblockid = NULL;
if (py_key_locator == Py_None)
key_locator = NULL;
else if (CCNObject_IsValid(KEY_LOCATOR, py_key_locator))
key_locator = CCNObject_Get(KEY_LOCATOR, py_key_locator);
else {
PyErr_SetString(PyExc_TypeError, "key_locator needs to be a CCN KeyLocator object");
return NULL;
}
py_si = CCNObject_New_charbuf(SIGNED_INFO, &si);
JUMP_IF_NULL(py_si, error);
r = ccn_signed_info_create(si, publisher_key_id, publisher_key_id_size,
timestamp, type, freshness, finalblockid, key_locator);
ccn_charbuf_destroy(&finalblockid);
if (r < 0) {
Py_DECREF(py_si);
PyErr_SetString(g_PyExc_CCNError, "Error while creating SignedInfo");
return NULL;
}
return py_si;
error:
ccn_charbuf_destroy(&finalblockid);
return NULL;
}
