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https://codeberg.org/grunfink/snac2.git
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102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/* snac - A simple, minimalistic ActivityPub instance */
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/* copyright (c) 2022 grunfink - MIT license */
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#include "xs.h"
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#include "xs_io.h"
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#include "xs_encdec.h"
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#include "xs_openssl.h"
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#include "xs_curl.h"
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#include "snac.h"
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d_char *http_signed_request(snac *snac, char *method, char *url,
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d_char *headers,
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d_char *body, int b_size,
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int *status, d_char **payload, int *p_size)
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/* does a signed HTTP request */
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{
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xs *l1;
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xs *date;
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xs *digest;
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xs *s64;
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xs *signature;
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xs *hdrs;
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char *host;
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char *target;
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char *seckey;
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char *k, *v;
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d_char *response;
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date = xs_utc_time("%a, %d %b %Y %H:%M:%S GMT");
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{
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xs *s = xs_replace(url, "https:/" "/", "");
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l1 = xs_split_n(s, "/", 1);
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}
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/* strip the url to get host and target */
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host = xs_list_get(l1, 0);
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if (xs_list_len(l1) == 2)
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target = xs_list_get(l1, 1);
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else
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target = "";
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/* digest */
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{
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xs *s;
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if (body != NULL)
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s = xs_sha256_base64(body, b_size);
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else
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s = xs_sha256_base64("", 0);
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digest = xs_fmt("SHA-256=%s", s);
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}
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seckey = xs_dict_get(snac->key, "secret");
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{
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/* build the string to be signed */
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xs *s = xs_fmt("(request-target): %s /%s\n"
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"host: %s\n"
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"digest: %s\n"
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"date: %s",
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strcmp(method, "POST") == 0 ? "post" : "get",
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target, host, digest, date);
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s64 = xs_evp_sign(seckey, s, strlen(s));
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}
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/* build now the signature header */
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signature = xs_fmt("keyId=\"%s#main-key\","
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"algorithm=\"rsa-sha256\","
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"headers=\"(request-target) host digest date\","
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"signature=\"%s\"",
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snac->actor, s64);
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/* transfer the original headers */
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hdrs = xs_dict_new();
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while (xs_dict_iter(&headers, &k, &v))
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hdrs = xs_dict_append(hdrs, k, v);
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/* add the new headers */
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if (strcmp(method, "POST") == 0)
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hdrs = xs_dict_append(hdrs, "content-type", "application/activity+json");
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else
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hdrs = xs_dict_append(hdrs, "accept", "application/activity+json");
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hdrs = xs_dict_append(hdrs, "date", date);
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hdrs = xs_dict_append(hdrs, "signature", signature);
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hdrs = xs_dict_append(hdrs, "digest", digest);
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hdrs = xs_dict_append(hdrs, "host", host);
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hdrs = xs_dict_append(hdrs, "user-agent", "snac/2.x");
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response = xs_http_request(method, url, hdrs,
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body, b_size, status, payload, p_size);
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srv_archive("SEND", hdrs, body, b_size, *status, response, *payload, *p_size);
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return response;
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}
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