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#define DC_LOGIN_FORMAT "{\"login\":\"%s\",\"password\":\"%s\",\"undelete\":false,\"captcha_key\":null,\"login_source\":null,\"gift_code_sku_id\":null}"
#define DC_USER_AGENT "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36"
#define DC_SERVER_ADDRESS "discord.com"
#define DC_SERVER_PORT 443
#define DC_SERVER_SSL 1
#define DC_SERVER_ORIGIN "https://discord.com"
#define DC_API_PREFIX "/api/v9/"
#define DC_LWS_ABLE_TO_PARSE_HEADERS 1
/* libwebsockets information: libwebsockets works with event loops and discord.c primary targets debian for building (it must work on debian), but debian does not ship libwebsockets with glib or libevent event loop support, so loops are implemented in the classic poll() style. this reduces performance probably. if you use discord.c API with support for a platform specific event loop, you may rewrite LWS to do things differently. currently calls into API (dc_api_i and dc_api_o) will both do LWS stuff. */
void dc_api_stack (struct dc_api_io i) { /* stack output struct to be delivered via dc_api_o 2usr */
DC_MR(i.program->api_ios);
i.program->api_ios[i.program->api_ios_length] = malloc(sizeof(i));
*(i.program->api_ios[i.program->api_ios_length++]) = i;
return;
}
static int dc_lws_cb (struct lws * wsi, enum lws_callback_reasons rs, void * us, void * in, size_t len) {
struct dc_lws_pass * pass = (struct dc_lws_pass *) us;
switch (rs) {
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR: /* TODO: handle and report somehow */
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n", in ? (char *) in : "(null)");
break;
case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER: /* lws gives us len space after *in */
;
unsigned char ** p = (unsigned char **) in, * end = (*p)+len;
for (int i = 0; i < DC_LWS_HEADERS_LENGTH; i++)
if (pass->headers[i][0])
if (lws_add_http_header_by_name(wsi, (const unsigned char *) dc_lws_headers[i], (const unsigned char *) pass->headers[i], strlen(pass->headers[i]), p, end))
return -1;
char slen[32];
snprintf(slen, 32, "%u", pass->body_length);
if (lws_add_http_header_by_name(wsi, (const unsigned char *) "Content-Length:", (const unsigned char *) slen, strlen(slen), p, end))
return -1;
if (!lws_http_is_redirected_to_get(wsi)) {
lwsl_user("doing POST flow\n");
lws_client_http_body_pending(wsi, 1);
lws_callback_on_writable(wsi);
} else
lwsl_user("doing GET flow, got redirected - this is a bug, report!\n");
break;
case LWS_CALLBACK_CLIENT_HTTP_WRITEABLE: /* see minimal post example on how to send */
if (lws_http_is_redirected_to_get(wsi)) {
fprintf(stderr, "http is redirected to get\n");
break; /* for setting avatar pictures or uploading files. Yecch */
}
fprintf(stderr, "LWS_CALLBACK_CLIENT_HTTP_WRITABLE, %d\n", pass->api_io.status);
if (lws_write(wsi, (unsigned char *) pass->body, pass->body_length, LWS_WRITE_HTTP_FINAL) != (int) pass->body_length) { /* TODO: fix to allow sending large bodies */
fprintf(stderr, "lws_write can't write that much!\n");
return 1;
}
lws_client_http_body_pending(wsi, 0);
if (pass->api_io.status & DC_MUST_FREE)
free(pass->body);
pass->body = NULL;
pass->body_length = 0;
break;
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
pass->status = lws_http_client_http_response(wsi); /* 200 OK, 404 Not Found,...*/
fprintf(stderr, "Connected with server response: %d\n", pass->status);
#ifdef DC_LWS_ABLE_TO_PARSE_HEADERS
/* how to query custom headers (http 1.x only at the moment) */
for (int i = 0; i < DC_LWS_HEADERS_LENGTH; i++) {
pass->headers[i][0] = '\0'; /* to clear any headers we requested with */
int n = lws_hdr_custom_length(wsi, dc_lws_headers[i], strlen(dc_lws_headers[i]));
if (n < -1)
lwsl_notice("Error with header %s.\n", dc_lws_headers[i]);
else
if (lws_hdr_custom_copy(wsi, pass->headers[i], DC_LWS_MAX_HEADER_LENGTH, dc_lws_headers[i], strlen(dc_lws_headers[i])) < 0)
lwsl_notice("Header %s too long or non existent.\n", dc_lws_headers[i]);
else
lwsl_notice("%s %s\n", dc_lws_headers[i], pass->headers[i]);
}
#endif
break;
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ: /* chunked body, without headers */
fprintf(stderr, "RECEIVE_CLIENT_HTTP_READ: read %d\n", len);
lwsl_hexdump_notice(in, len); /* for debugging purposes, kek */
if (!(pass->api_io.status & DC_MUST_FREE)) { /* we start filling the ->body */
pass->api_io.status |= DC_MUST_FREE; /* buffer, on end of wsi session */
pass->body = NULL; /* dc_api_i is called from DC_CALLBACK_WSI_DESTROY */
} /* if ->body from input was not freed and it should be, res body is appended */
pass->body_length += len; /* if ->body was static, pointer is changed to NULL */
pass->body = realloc(pass->body, pass->body_length + 1); /* normally - no edge */
memcpy(pass->body+pass->body_length-len, in, len); /* case - resp body will be */
pass->body[pass->body_length] = '\0'; /* on heap and freed on _DESTROY. */
return 0; /* don't pass to lws_callback_http_dummy */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP: /* uninterpreted http content */
fprintf(stderr, "LCRCH\n");
char buffer[DC_LWS_BUF + LWS_PRE];
char * ptr = buffer + LWS_PRE; /* see, BEFORE the pointer - lower addr */
int len2 /* DC_LWS_BUF again */ = sizeof(buffer) - LWS_PRE;
if (lws_http_client_read(wsi, &ptr, &len2) < 0) {
fprintf(stderr, "lws_http_client_read -1\n");
return -1;
}
return 0; /* don't pass to lws_callback_http_dummy */
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
break;
case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
lwsl_user("LWS_CALLBACK_CLOSED_CLIENT_HTTP\n");
break;
case LWS_CALLBACK_WSI_DESTROY: /* if I understand the docs correctly, this is allways */
if (pass->api_io.pass != pass)
fprintf(stderr, "[!!!] REPORT THIS BUG: pass->api_io.pass != pass\n");
pass->api_io.status |= DC_FROM_LWS;
dc_api_i(pass->api_io);
pass->api_io.status &= ~DC_FROM_LWS;
fprintf(stderr, "pass before freed is %p\n", (void *) pass);
if (pass->api_io.status & DC_MUST_FREE) /* we still do this check in case */
free(pass->body); /* _READ was not called and pointer was static */
free(pass); /* called at the final moment when user pointer and wsi is still */
break; /* accessible - we can free the struct that was passed in as a heap ptr */
default:
break;
}
return lws_callback_http_dummy(wsi, rs, us, in, len);
}
void dc_api_i (struct dc_api_io i) { /* this function does not call attached functions, only output does that */
if (!i.program)
return;
if (i.program->lws_context && !(i.status & DC_FROM_LWS))
lws_service(i.program->lws_context, 0); /* DO NOT CALL THIS FROM _cb! */
switch (i.type) {
case DC_API_MESSAGE:
break;
case DC_API_CHANNEL:
break;
case DC_API_GUILD:
break;
case DC_API_LOGIN: /* library currently only works for a single client */
if (!i.program->clients_length) /* already attempted login */
DC_MR(i.program->clients);
i.program->clients[0] = i.client;
struct lws_client_connect_info info;
memset(&info, 0, sizeof(info));
info.context = i.program->lws_context;
#if DC_SERVER_SSL
info.ssl_connection = LCCSCF_USE_SSL;
#endif
info.port = DC_SERVER_PORT;
info.address = DC_SERVER_ADDRESS;
info.path = DC_API_PREFIX "auth/login";
info.host = info.address;
/* info.origin = DC_SERVER_ORIGIN; */ /* just don't send it */
info.method = "POST";
struct dc_lws_pass * pass = calloc(1, sizeof(struct dc_lws_pass)); /* cb frees */
fprintf(stderr, "allocated pass at %p\n", (void *) pass);
i.status |= DC_MUST_FREE;
pass->body_length = smprintf(&pass->body, DC_LOGIN_FORMAT, i.client->email, i.client->password);
fprintf(stderr, "length: %u string: %s\n", pass->body_length, pass->body);
i.type = DC_API_LOGIN_CB;
memcpy(&pass->api_io, &i, sizeof(i));
pass->api_io.pass = pass;
strcpy(pass->headers[DC_LWS_CONTENT_TYPE], "application/json");
info.userdata = pass;
#if DC_LWS_ABLE_TO_PARSE_HEADERS
info.alpn = "http/1.1";
#endif
info.protocol = dc_lws_protocols[0].name;
if (i.client->authorization) /* attempt cookie login without user/pass */
strcpy(pass->headers[DC_LWS_AUTHORIZATION], i.client->authorization);
lws_client_connect_via_info(&info);
break;
case DC_API_LOGIN_CB:
#define DC_STACK_RETURN(x) do { i.status = x; dc_api_stack(i); return; } while (0)
i.type = DC_API_LOGIN;
if (!i.pass->body) {
i.status |= DC_REQUEST_FAILED;
i.status &= ~(DC_OK);
dc_api_stack(i);
break;
}
fprintf(stderr, "DEBUG: %s\n", i.pass->body);
if (strstr(i.pass->body, "INVALID_LOGIN"))
DC_STACK_ERROR(DC_BAD_LOGIN);
if (strstr(i.pass->body, "captcha-required"))
DC_STACK_ERROR(DC_CAPTCHA_NEEDED);
if (strstr(i.pass->body, "ACCOUNT_LOGIN_VERIFICATION_EMAIL"))
DC_STACK_ERROR(DC_VERIFICATION_NEEDED);
char * cp, c2;
if (!(cp = strstr(i.pass->body, "\"token\": \"")) || !(c2 = strchr(cp+strlen("\"token\": \""), '"')))
DC_STACK_ERROR(DC_ERROR);
c2[0] = '\0'; /* body is on heap, we can edit it */
free(i.client->authorization); /* in case we set it previously */
i.client->authorization = strdup(cp);
fprintf(stderr, "got token %s\n", i.client->authorization);
DC_STACK_RETURN(DC_OK | DC_INCOMPLETE /* we now have to request properties */);
break;
case DC_API_REGISTER:
break;
case DC_API_STATUS:
break;
case DC_API_USER:
break;
case DC_API_ROLE:
break;
case DC_API_NONE:
break;
case DC_API_ATTACH:
if (i.attached_function->type == DC_API_NONE)
break;
DC_MR(i.program->attached_functions); /* makes room for at least one */
break;
}
}
struct dc_api_io dc_api_o (struct dc_api_io i /* for ->program */) {
if (i.program->lws_context)
lws_service(i.program->lws_context, 0);
struct dc_api_io o = {
.type = DC_API_NONE,
.program = i.program
};
/* dc_api_stack pop: */
if (i.program->api_ios_length) {
memcpy(&o, (i.program->api_ios[--i.program->api_ios_length]), sizeof(o));
dc_api_io_free(i.program->api_ios[i.program->api_ios_length]);
}
for (size_t j = 0; j < i.program->attached_functions_length; j++) { /* call attached functions */
if (i.program->attached_functions[j]->type == o.type) /* wow, it's possible to attach to NONE */
i.program->attached_functions[j]->function(o, i.program->attached_functions[j]->user_data);
}
return o;
}
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