commit f88bdd7

Added a webmention hook.

 1@@ -868,6 +868,14 @@ xs_html *html_user_head(snac *user, const char *desc, const char *url)
 2             xs_html_attr("type", "application/activity+json"),
 3             xs_html_attr("href", url ? url : user->actor)));
 4 
 5+    /* webmention hook */
 6+    xs *wbh = xs_fmt("%s/webmention-hook", srv_baseurl);
 7+
 8+    xs_html_add(head,
 9+        xs_html_sctag("link",
10+            xs_html_attr("rel", "webmention"),
11+            xs_html_attr("href", wbh)));
12+
13     return head;
14 }
15 
16@@ -3407,13 +3415,15 @@ xs_str *html_notifications(snac *user, int skip, int show)
17 
18         const char *actor_id = xs_dict_get(noti, "actor");
19         xs *actor = NULL;
20+        xs *a_name = NULL;
21 
22-        if (!valid_status(actor_get(actor_id, &actor)))
23-            continue;
24+        if (valid_status(actor_get(actor_id, &actor)))
25+            a_name = actor_name(actor, proxy);
26+        else
27+            a_name = xs_dup(actor_id);
28 
29-        xs *a_name = actor_name(actor, proxy);
30-        xs *label_sanatized = sanitize(type);
31-        const char *label = label_sanatized;
32+        xs *label_sanitized = sanitize(type);
33+        const char *label = label_sanitized;
34 
35         if (strcmp(type, "Create") == 0)
36             label = L("Mention");

 1@@ -12,6 +12,7 @@
 2 #include "xs_openssl.h"
 3 #include "xs_fcgi.h"
 4 #include "xs_html.h"
 5+#include "xs_webmention.h"
 6 
 7 #include "snac.h"
 8 
 9@@ -373,6 +374,63 @@ int server_get_handler(xs_dict *req, const char *q_path,
10 }
11 
12 
13+int server_post_handler(const xs_dict *req, const char *q_path,
14+                      char *payload, int p_size,
15+                      char **body, int *b_size, char **ctype)
16+{
17+    int status = 0;
18+
19+    if (strcmp(q_path, "/webmention-hook") == 0) {
20+        status = HTTP_STATUS_BAD_REQUEST;
21+
22+        const xs_dict *p_vars = xs_dict_get(req, "p_vars");
23+
24+        if (!xs_is_dict(p_vars))
25+            return status;
26+
27+        const char *source = xs_dict_get(p_vars, "source");
28+        const char *target = xs_dict_get(p_vars, "target");
29+
30+        if (!xs_is_string(source) || !xs_is_string(target)) {
31+            srv_debug(1, xs_fmt("webmention-hook bad source or target"));
32+            return status;
33+        }
34+
35+        if (!xs_startswith(target, srv_baseurl)) {
36+            srv_debug(1, xs_fmt("webmention-hook unknown target %s", target));
37+            return status;
38+        }
39+
40+        if (!object_here(target)) {
41+            srv_debug(0, xs_fmt("webmention-hook target %s not / no longer here", target));
42+            return status;
43+        }
44+
45+        /* get the user */
46+        xs *s1 = xs_replace(target, srv_baseurl, "");
47+
48+        xs *l1 = xs_split(s1, "/");
49+        const char *uid = xs_list_get(l1, 1);
50+        snac user;
51+
52+        if (!xs_is_string(uid) || !user_open(&user, uid))
53+            return status;
54+
55+        int r = xs_webmention_hook(source, target, USER_AGENT);
56+
57+        if (r > 0)
58+            notify_add(&user, "Webmention", NULL, source, target, xs_stock(XSTYPE_DICT));
59+
60+        srv_log(xs_fmt("webmention-hook source=%s target=%s %d", source, target, r));
61+
62+        user_free(&user);
63+        status = HTTP_STATUS_OK;
64+    }
65+
66+    return status;
67+}
68+
69+
70 void httpd_connection(FILE *f)
71 /* the connection processor */
72 {
73@@ -444,6 +502,10 @@ void httpd_connection(FILE *f)
74     else
75     if (strcmp(method, "POST") == 0) {
76 
77+        if (status == 0)
78+            status = server_post_handler(req, q_path,
79+                        payload, p_size, &body, &b_size, &ctype);
80+
81 #ifndef NO_MASTODON_API
82         if (status == 0)
83             status = oauth_post_handler(req, q_path,

 1@@ -5,6 +5,7 @@
 2 #define _XS_WEBMENTION_H
 3 
 4 int xs_webmention_send(const char *source, const char *target, const char *user_agent);
 5+int xs_webmention_hook(const char *source, const char *target, const char *user_agent);
 6 
 7 
 8 #ifdef XS_IMPLEMENTATION
 9@@ -118,6 +119,47 @@ int xs_webmention_send(const char *source, const char *target, const char *user_
10 }
11 
12 
13+int xs_webmention_hook(const char *source, const char *target, const char *user_agent)
14+/* a Webmention has been received for a target that is ours; check if the source
15+   really contains a link to our target */
16+{
17+    int status = 0;
18+
19+    xs *ua = xs_fmt("%s (Webmention)", user_agent ? user_agent : "xs_webmention");
20+    xs *headers = xs_dict_new();
21+    headers = xs_dict_set(headers, "accept", "text/html");
22+    headers = xs_dict_set(headers, "user-agent", ua);
23+
24+    xs *g_req = NULL;
25+    xs *payload = NULL;
26+    int p_size = 0;
27+
28+    g_req = xs_http_request("GET", source, headers, NULL, 0, &status, &payload, &p_size, 0);
29+
30+    if (status < 200 || status > 299)
31+        return -1;
32+
33+    if (!xs_is_string(payload))
34+        return -2;
35+
36+    /* note: a "rogue" webmention can include a link to our target in commented-out HTML code */
37+
38+    xs *links = xs_regex_select(payload, "<(a +|link +)[^>]+>");
39+    const char *link;
40+
41+    status = 0;
42+    xs_list_foreach(links, link) {
43+        /* if the link contains our target, it's valid */
44+        if (xs_str_in(link, target) != -1) {
45+            status = 1;
46+            break;
47+        }
48+    }
49+
50+    return status;
51+}
52+
53+
54 #endif /* XS_IMPLEMENTATION */
55 
56 #endif /* _XS_WEBMENTION_H */