static CC *ed25519FromJSON(const cJSON *params, char *err) {
size_t binsz;
cJSON *pk_item = cJSON_GetObjectItem(params, "publicKey");
if (!cJSON_IsString(pk_item)) {
strcpy(err, "publicKey must be a string");
return NULL;
}
unsigned char *pk = base64_decode(pk_item->valuestring, &binsz);
if (32 != binsz) {
strcpy(err, "publicKey has incorrect length");
free(pk);
return NULL;
}
cJSON *signature_item = cJSON_GetObjectItem(params, "signature");
unsigned char *sig = NULL;
if (signature_item && !cJSON_IsNull(signature_item)) {
if (!cJSON_IsString(signature_item)) {
strcpy(err, "signature must be null or a string");
return NULL;
}
sig = base64_decode(signature_item->valuestring, &binsz);
if (64 != binsz) {
strcpy(err, "signature has incorrect length");
free(sig);
return NULL;
}
}
CC *cond = cc_new(CC_Ed25519);
cond->publicKey = pk;
cond->signature = sig;
return cond;
}
static enum patch_operation decode_patch_operation(const cJSON * const patch, const cJSON_bool case_sensitive)
{
cJSON *operation = get_object_item(patch, "op", case_sensitive);
if (!cJSON_IsString(operation))
{
return INVALID;
}
if (strcmp(operation->valuestring, "add") == 0)
{
return ADD;
}
if (strcmp(operation->valuestring, "remove") == 0)
{
return REMOVE;
}
if (strcmp(operation->valuestring, "replace") == 0)
{
return REPLACE;
}
if (strcmp(operation->valuestring, "move") == 0)
{
return MOVE;
}
if (strcmp(operation->valuestring, "copy") == 0)
{
return COPY;
}
if (strcmp(operation->valuestring, "test") == 0)
{
return TEST;
}
return INVALID;
}
static int apply_patch(cJSON *object, const cJSON *patch, const cJSON_bool case_sensitive)
{
cJSON *path = NULL;
cJSON *value = NULL;
cJSON *parent = NULL;
enum patch_operation opcode = INVALID;
unsigned char *parent_pointer = NULL;
unsigned char *child_pointer = NULL;
int status = 0;
path = get_object_item(patch, "path", case_sensitive);
if (!cJSON_IsString(path))
{
/* malformed patch. */
status = 2;
goto cleanup;
}
opcode = decode_patch_operation(patch, case_sensitive);
if (opcode == INVALID)
{
status = 3;
goto cleanup;
}
else if (opcode == TEST)
{
/* compare value: {...} with the given path */
status = !compare_json(get_item_from_pointer(object, path->valuestring, case_sensitive), get_object_item(patch, "value", case_sensitive), case_sensitive);
goto cleanup;
}
/* special case for replacing the root */
if (path->valuestring[0] == '\0')
{
if (opcode == REMOVE)
{
static const cJSON invalid = { NULL, NULL, NULL, cJSON_Invalid, NULL, 0, 0, NULL};
overwrite_item(object, invalid);
status = 0;
goto cleanup;
}
if ((opcode == REPLACE) || (opcode == ADD))
{
value = get_object_item(patch, "value", case_sensitive);
if (value == NULL)
{
/* missing "value" for add/replace. */
status = 7;
goto cleanup;
}
value = cJSON_Duplicate(value, 1);
if (value == NULL)
{
/* out of memory for add/replace. */
status = 8;
goto cleanup;
}
overwrite_item(object, *value);
/* delete the duplicated value */
cJSON_free(value);
value = NULL;
/* the string "value" isn't needed */
if (object->string != NULL)
{
cJSON_free(object->string);
object->string = NULL;
}
status = 0;
goto cleanup;
}
}
if ((opcode == REMOVE) || (opcode == REPLACE))
{
/* Get rid of old. */
cJSON *old_item = detach_path(object, (unsigned char*)path->valuestring, case_sensitive);
if (old_item == NULL)
{
status = 13;
goto cleanup;
}
cJSON_Delete(old_item);
if (opcode == REMOVE)
{
/* For Remove, this job is done. */
status = 0;
goto cleanup;
}
}
/* Copy/Move uses "from". */
if ((opcode == MOVE) || (opcode == COPY))
{
cJSON *from = get_object_item(patch, "from", case_sensitive);
if (from == NULL)
{
/* missing "from" for copy/move. */
status = 4;
goto cleanup;
}
if (opcode == MOVE)
{
value = detach_path(object, (unsigned char*)from->valuestring, case_sensitive);
}
if (opcode == COPY)
{
value = get_item_from_pointer(object, from->valuestring, case_sensitive);
}
if (value == NULL)
{
/* missing "from" for copy/move. */
status = 5;
goto cleanup;
}
if (opcode == COPY)
{
value = cJSON_Duplicate(value, 1);
}
if (value == NULL)
{
/* out of memory for copy/move. */
status = 6;
goto cleanup;
}
}
else /* Add/Replace uses "value". */
{
value = get_object_item(patch, "value", case_sensitive);
if (value == NULL)
{
/* missing "value" for add/replace. */
status = 7;
goto cleanup;
}
value = cJSON_Duplicate(value, 1);
if (value == NULL)
{
/* out of memory for add/replace. */
status = 8;
goto cleanup;
}
}
/* Now, just add "value" to "path". */
/* split pointer in parent and child */
parent_pointer = cJSONUtils_strdup((unsigned char*)path->valuestring);
child_pointer = (unsigned char*)strrchr((char*)parent_pointer, '/');
if (child_pointer != NULL)
{
child_pointer[0] = '\0';
child_pointer++;
}
parent = get_item_from_pointer(object, (char*)parent_pointer, case_sensitive);
decode_pointer_inplace(child_pointer);
/* add, remove, replace, move, copy, test. */
if ((parent == NULL) || (child_pointer == NULL))
{
/* Couldn't find object to add to. */
status = 9;
goto cleanup;
}
else if (cJSON_IsArray(parent))
{
if (strcmp((char*)child_pointer, "-") == 0)
{
cJSON_AddItemToArray(parent, value);
value = NULL;
}
else
{
size_t index = 0;
if (!decode_array_index_from_pointer(child_pointer, &index))
{
status = 11;
goto cleanup;
}
if (!insert_item_in_array(parent, index, value))
{
status = 10;
goto cleanup;
}
value = NULL;
}
}
else if (cJSON_IsObject(parent))
{
cJSON_DeleteItemFromObject(parent, (char*)child_pointer);
cJSON_AddItemToObject(parent, (char*)child_pointer, value);
value = NULL;
}
cleanup:
if (value != NULL)
{
cJSON_Delete(value);
}
if (parent_pointer != NULL)
{
cJSON_free(parent_pointer);
}
return status;
}
