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/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2022 grunfink - MIT license */
#include "xs.h"
#include "xs_encdec.h"
#include "xs_json.h"
#include "xs_curl.h"
#include "snac.h"
const char *public_address = "https:/" "/www.w3.org/ns/activitystreams#Public";
int activitypub_request(snac *snac, char *url, d_char **data)
/* request an object */
{
int status;
xs *response = NULL;
xs *payload = NULL;
int p_size;
char *ctype;
/* check if it's an url for this same site */
/* ... */
/* get from the net */
response = http_signed_request(snac, "GET", url,
NULL, NULL, 0, &status, &payload, &p_size);
if (valid_status(status)) {
if (dbglevel >= 3) {
xs *j = xs_json_dumps_pp(response, 4);
fprintf(stderr, "%s\n", j);
}
/* ensure it's ActivityPub data */
ctype = xs_dict_get(response, "content-type");
if (xs_str_in(ctype, "application/activity+json") != -1)
*data = xs_json_loads(payload);
else
status = 500;
}
if (!valid_status(status))
*data = NULL;
return status;
}
int actor_request(snac *snac, char *actor, d_char **data)
/* request an actor */
{
int status, status2;
xs *payload = NULL;
/* get from disk first */
status = actor_get(snac, actor, data);
if (status == 200)
return status;
/* actor data non-existent or stale: get from the net */
status2 = activitypub_request(snac, actor, &payload);
if (valid_status(status2)) {
/* renew data */
status = actor_add(snac, actor, payload);
*data = payload;
payload = NULL;
}
return status;
}
int send_to_inbox(snac *snac, char *inbox, char *msg, d_char **payload, int *p_size)
/* sends a message to an Inbox */
{
int status;
d_char *response;
xs *j_msg = xs_json_dumps_pp(msg, 4);
response = http_signed_request(snac, "POST", inbox,
NULL, j_msg, strlen(j_msg), &status, payload, p_size);
free(response);
return status;
}
int send_to_actor(snac *snac, char *actor, char *msg, d_char **payload, int *p_size)
/* sends a message to an actor */
{
int status;
xs *data = NULL;
/* resolve the actor first */
status = actor_request(snac, actor, &data);
if (valid_status(status)) {
char *inbox = xs_dict_get(data, "inbox");
if (inbox != NULL)
status = send_to_inbox(snac, inbox, msg, payload, p_size);
else
status = 400;
}
snac_log(snac, xs_fmt("send_to_actor %s %d", actor, status));
return status;
}
void process_queue(snac *snac)
/* processes the queue */
{
xs *list;
char *p, *fn;
int queue_retry_max = xs_number_get(xs_dict_get(srv_config, "queue_retry_max"));
list = queue(snac);
p = list;
while (xs_list_iter(&p, &fn)) {
xs *q_item = dequeue(snac, fn);
char *type;
if ((type = xs_dict_get(q_item, "type")) == NULL)
type = "output";
if (strcmp(type, "output") == 0) {
int status;
char *actor = xs_dict_get(q_item, "actor");
char *msg = xs_dict_get(q_item, "object");
int retries = xs_number_get(xs_dict_get(q_item, "retries"));
/* deliver */
status = send_to_actor(snac, actor, msg, NULL, 0);
if (!valid_status(status)) {
/* error sending; reenqueue? */
if (retries > queue_retry_max)
snac_log(snac, xs_fmt("process_queue giving up %s %d", actor, status));
else {
/* reenqueue */
enqueue_output(snac, actor, msg, retries + 1);
snac_log(snac, xs_fmt("process_queue requeue %s %d", actor, retries + 1));
}
}
}
}
}
int activitypub_post_handler(d_char *req, char *q_path,
d_char *payload, int p_size,
char **body, int *b_size, char **ctype)
/* processes an input message */
{
int status = 200;
char *i_ctype = xs_dict_get(req, "content-type");
snac snac;
if (xs_str_in(i_ctype, "application/activity+json") == -1 &&
xs_str_in(i_ctype, "application/ld+json") == -1)
return 0;
xs *l = xs_split_n(q_path, "/", 2);
char *uid;
if (xs_list_len(l) != 3 || strcmp(xs_list_get(l, 2), "inbox") != 0) {
/* strange q_path */
srv_log(xs_fmt("activitypub_post_handler unsupported path %s", q_path));
return 404;
}
uid = xs_list_get(l, 1);
if (!user_open(&snac, uid)) {
/* invalid user */
srv_log(xs_fmt("activitypub_post_handler bad user %s", uid));
return 404;
}
user_free(&snac);
return status;
}
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