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#ifndef DISFLUID_ACTIVITY_OBJECT_INCLUDED
# define DISFLUID_ACTIVITY_OBJECT_INCLUDED
# include <config.h>
# include "string-desc.h"
# include <jansson.h>
MAYBE_UNUSED static int
activity_object_context_prefix (json_t * object,
string_desc_t * context_prefix);
# include "disfluid-append-only-file.h"
# include "safe-alloc.h"
static bool
activity_object_is_as (json_t * value, bool with_hash)
{
static const char *as = "https://www.w3.org/ns/activitystreams#";
const size_t as_len_h = strlen (as);
const size_t as_len_s = as_len_h - 1;
size_t as_len = as_len_s;
if (with_hash)
{
as_len = as_len_h;
}
return (json_is_string (value)
&& json_string_length (value) == as_len
&& strncmp (json_string_value (value), as, as_len) == 0);
}
static int
activity_object_context_prefix (json_t * object,
string_desc_t * context_prefix)
{
context_prefix->_nbytes = 0;
context_prefix->_data = NULL;
if (!json_is_object (object))
{
return -1;
}
json_t *context = json_object_get (object, "@context");
if (activity_object_is_as (context, false))
{
/* This is the only context. */
context_prefix->_nbytes = 0;
context_prefix->_data = NULL;
return 0;
}
else if (json_is_object (context))
{
json_t *vocab = json_object_get (context, "@vocab");
if (activity_object_is_as (vocab, true))
{
/* Also not prefixed. */
context_prefix->_nbytes = 0;
context_prefix->_data = NULL;
return 0;
}
/* Maybe it is a value of the context object. */
const char *key;
json_t *value;
context_prefix->_nbytes = 0;
context_prefix->_data = NULL;
json_object_foreach (context, key, value)
{
if (key[0] != '@' && activity_object_is_as (value, true))
{
FREE (context_prefix->_data);
context_prefix->_nbytes = strlen (key) + 1; /* for the final : */
if (ALLOC_N (context_prefix->_data, context_prefix->_nbytes) < 0)
{
return -2;
}
memcpy (context_prefix->_data, key, context_prefix->_nbytes - 1);
context_prefix->_data[context_prefix->_nbytes - 1] = ':';
}
}
if (context_prefix->_data != NULL)
{
return 0;
}
}
else if (json_is_array (context))
{
size_t n = json_array_size (context);
for (size_t i = 0; i < n; i++)
{
json_t *value = json_array_get (context, i);
if (activity_object_is_as (value, false))
{
context_prefix->_nbytes = 0;
context_prefix->_data = NULL;
return 0;
}
}
}
return -1;
}
#endif /* not DISFLUID_ACTIVITY_OBJECT_INCLUDED */
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