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/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
#include "xs.h"
#include "xs_json.h"
#include "xs_curl.h"
#include "xs_mime.h"
#include "snac.h"
int webfinger_request_signed(snac *snac, const char *qs, char **actor, char **user)
/* queries the webfinger for qs and fills the required fields */
{
int status;
xs *payload = NULL;
int p_size = 0;
xs *headers = xs_dict_new();
xs *l = NULL;
xs_str *host = NULL;
xs *resource = NULL;
if (xs_startswith(qs, "https:/" "/")) {
/* actor query: pick the host */
xs *s = xs_replace_n(qs, "https:/" "/", "", 1);
l = xs_split_n(s, "/", 1);
host = xs_list_get(l, 0);
resource = xs_dup(qs);
}
else {
/* it's a user */
xs *s = xs_strip_chars_i(xs_dup(qs), "@.");
l = xs_split_n(s, "@", 1);
if (xs_list_len(l) == 2) {
host = xs_list_get(l, 1);
resource = xs_fmt("acct:%s", s);
}
}
if (host == NULL || resource == NULL)
return 400;
headers = xs_dict_append(headers, "accept", "application/json");
headers = xs_dict_append(headers, "user-agent", USER_AGENT);
xs *obj = NULL;
xs *cached_qs = xs_fmt("webfinger:%s", qs);
/* is it cached? */
if (valid_status(status = object_get(cached_qs, &obj))) {
/* nothing more to do */
}
else
/* is it a query about one of us? */
if (strcmp(host, xs_dict_get(srv_config, "host")) == 0) {
/* route internally */
xs *req = xs_dict_new();
xs *q_vars = xs_dict_new();
char *ctype;
q_vars = xs_dict_append(q_vars, "resource", resource);
req = xs_dict_append(req, "q_vars", q_vars);
status = webfinger_get_handler(req, "/.well-known/webfinger",
&payload, &p_size, &ctype);
}
else {
xs *url = xs_fmt("https:/" "/%s/.well-known/webfinger?resource=%s", host, resource);
if (snac == NULL)
xs_http_request("GET", url, headers, NULL, 0, &status, &payload, &p_size, 0);
else
http_signed_request(snac, "GET", url, headers, NULL, 0, &status, &payload, &p_size, 0);
}
if (obj == NULL && valid_status(status) && payload) {
obj = xs_json_loads(payload);
object_add(cached_qs, obj);
}
if (obj) {
if (user != NULL) {
char *subject = xs_dict_get(obj, "subject");
if (subject)
*user = xs_replace_n(subject, "acct:", "", 1);
}
if (actor != NULL) {
char *list = xs_dict_get(obj, "links");
char *v;
while (xs_list_iter(&list, &v)) {
if (xs_type(v) == XSTYPE_DICT) {
char *type = xs_dict_get(v, "type");
if (type && (strcmp(type, "application/activity+json") == 0 ||
strcmp(type, "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") == 0)) {
*actor = xs_dup(xs_dict_get(v, "href"));
break;
}
}
}
}
}
return status;
}
int webfinger_request(const char *qs, char **actor, char **user)
/* queries the webfinger for qs and fills the required fields */
{
return webfinger_request_signed(NULL, qs, actor, user);
}
int webfinger_get_handler(xs_dict *req, char *q_path,
char **body, int *b_size, char **ctype)
/* serves webfinger queries */
{
int status;
(void)b_size;
if (strcmp(q_path, "/.well-known/webfinger") != 0)
return 0;
char *q_vars = xs_dict_get(req, "q_vars");
char *resource = xs_dict_get(q_vars, "resource");
if (resource == NULL)
return 400;
snac snac;
int found = 0;
if (xs_startswith(resource, "https:/" "/")) {
/* actor search: find a user with this actor */
xs *l = xs_split(resource, "/");
char *uid = xs_list_get(l, -1);
if (uid)
found = user_open(&snac, uid);
}
else
if (xs_startswith(resource, "acct:")) {
/* it's an account name */
xs *an = xs_replace_n(resource, "acct:", "", 1);
xs *l = NULL;
/* strip a possible leading @ */
if (xs_startswith(an, "@"))
an = xs_crop_i(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 *prof = xs_dict_new();
xs *links = xs_list_new();
xs *obj = xs_dict_new();
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);
prof = xs_dict_append(prof, "rel", "http://webfinger.net/rel/profile-page");
prof = xs_dict_append(prof, "type", "text/html";
prof = xs_dict_append(prof, "href", snac.actor);
links = xs_list_append(links, prof);
char *avatar = xs_dict_get(snac.config, "avatar");
if (!xs_is_null(avatar) && *avatar) {
xs *d = xs_dict_new();
d = xs_dict_append(d, "rel", "http:/" "/webfinger.net/rel/avatar");
d = xs_dict_append(d, "type", xs_mime_by_ext(avatar));
d = xs_dict_append(d, "href", avatar);
links = xs_list_append(links, d);
}
obj = xs_dict_append(obj, "subject", acct);
obj = xs_dict_append(obj, "links", links);
xs_str *j = xs_json_dumps(obj, 4);
user_free(&snac);
status = 200;
*body = j;
*ctype = "application/json";
}
else
status = 404;
return status;
}
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