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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"
void webfinger_request(char *qs, int *status, char **actor, char **user)
/* queries the webfinger for qs and fills the required fields */
{
xs *payload = NULL;
int p_size = 0;
xs *url = NULL;
xs *headers = xs_dict_new();
if (xs_startswith(qs, "https:/" "/")) {
/* actor query: pick the host */
xs *s = xs_replace(qs, "https:/" "/", "");
xs *l = xs_split_n(s, "/", 1);
url = xs_fmt("https:/" "/%s/.well-known/webfinger?resource=%s",
xs_list_get(l, 0), qs);
}
else {
/* it's a user */
xs *s = xs_dup(qs);
xs *l;
if (xs_startswith(s, "@"))
s = xs_crop(s, 1, 0);
l = xs_split_n(s, "@", 1);
if (xs_list_len(l) == 2) {
url = xs_fmt("https:/" "/%s/.well-known/webfinger?resource:acct:%s",
xs_list_get(l, 1), qs);
}
}
if (url == NULL) {
*status = 400;
return;
}
headers = xs_dict_append(headers, "accept", "application/json");
xs_http_request("GET", url, headers, NULL, 0, status, &payload, &p_size);
}
void webfinger_get_handler(d_char *req, char *q_path, int *status,
char **body, int *b_size, char **ctype)
/* serves webfinger queries */
{
if (strcmp(q_path, "/.well-known/webfinger") != 0)
return;
char *q_vars = xs_dict_get(req, "q_vars");
char *resource = xs_dict_get(q_vars, "resource");
if (resource == NULL) {
*status = 400;
return;
}
snac snac;
int found = 0;
if (xs_startswith(resource, "https:/" "/")) {
/* actor search: find a user with this actor */
xs *list = user_list();
char *p, *uid;
p = list;
while (xs_list_iter(&p, &uid)) {
if (user_open(&snac, uid)) {
if (strcmp(snac.actor, resource) == 0) {
found = 1;
break;
}
user_free(&snac);
}
}
}
else
if (xs_startswith(resource, "acct:")) {
/* it's an account name */
xs *an = xs_replace(resource, "acct:", "");
xs *l = NULL;
/* strip a possible leading @ */
if (xs_startswith(an, "@"))
an = xs_crop(an, 1, 0);
l = xs_split_n(an, "@", 1);
if (xs_list_len(l) == 2) {
char *uid = xs_list_get(l, 0);
char *host = xs_list_get(l, 1);
if (strcmp(host, xs_dict_get(srv_config, "host")) == 0)
found = user_open(&snac, uid);
}
}
if (found) {
/* build the object */
xs *acct;
xs *aaj = xs_dict_new();
xs *links = xs_list_new();
xs *obj = xs_dict_new();
d_char *j;
acct = xs_fmt("acct:%s@%s",
xs_dict_get(snac.config, "uid"), xs_dict_get(srv_config, "host"));
aaj = xs_dict_append(aaj, "rel", "self");
aaj = xs_dict_append(aaj, "type", "application/activity+json");
aaj = xs_dict_append(aaj, "href", snac.actor);
links = xs_list_append(links, aaj);
obj = xs_dict_append(obj, "subject", acct);
obj = xs_dict_append(obj, "links", links);
j = xs_json_dumps_pp(obj, 4);
user_free(&snac);
*status = 200;
*body = j;
*ctype = "application/json";
}
}
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