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path: root/src/httpd.c
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char * sc_queryhtml (struct sc_query * q) { /* remember to free returned string in the caller */ /* caller takes care of locking */
	size_t resultshtml_written = 0;
	size_t resultshtml_sizeof = SC_ALLOC_CHUNK;
	char * resultshtml = malloc(resultshtml_sizeof);
	resultshtml[0] = '\0';
	for (size_t i = 0; i < q->results_length; i++) {
#define SC_HRC(string, wanted) \
		if (string##_written+wanted >= string##_sizeof) { \
			string##_sizeof = (string##_written+wanted+1)*SC_REALLOC_K; \
			string = realloc(string, string##_sizeof); \
		}
#define SC_HRF "<div class=result id=result%lu><h4><a href=\"%s\" accesskey=%lu>%s</a> " \
	"<span class=breadcrumb>%s</span></h4><p>%s</p></div>"
#define SC_HRA i, safeurl, i, safetitle, safebreadcrumbs, safebody
		char * safetitle = htmlspecialchars(q->results[i]->title);
		char * safebody = htmlspecialchars(q->results[i]->desc);
		char * safeurl = htmlspecialchars(q->results[i]->url);
		char * safebreadcrumbs = htmlspecialchars(q->results[i]->breadcrumbs);
		size_t ws = snprintf(NULL, 0, SC_HRF, SC_HRA);
		SC_HRC(resultshtml, ws);
		resultshtml_written += sprintf(resultshtml+resultshtml_written, SC_HRF, SC_HRA);
		free(safebreadcrumbs);
		free(safetitle);
		free(safebody);
		free(safeurl);
	}
#define SC_HRS SC_I18N_NUMBER_OF_RESULTS ": %ld | " SC_I18N_QUERY_TIME ": %s"
	char formatted_time[128];
	struct tm tm;
	localtime_r(&q->lookup_time, &tm);
	strftime(formatted_time, 128, SC_I18N_DATETIME_FORMAT, &tm);
	char queryinfo[256];
	snprintf(queryinfo, 256, SC_HRS, q->results_length, formatted_time);
	char * safequery = htmlspecialchars(q->string);
	char * response = malloc(strlen((char *) sc_hp)+2*strlen(safequery)+strlen(queryinfo)+strlen(resultshtml));
	sprintf(response, (char *) sc_hp, safequery, safequery, queryinfo, resultshtml);
	free(safequery);
	free(resultshtml);
	return response;
}
char * sc_logshtml (struct sc_cache * c) { /* remember to free on caller, remember not to report errors here whilst locked */
	char * html = malloc(SC_ALLOC_CHUNK);
	html[0] = '\0';
	size_t html_written = 0;
	size_t html_sizeof = 0;
	pthread_rwlock_rdlock(c->logentries_lock);
	if (!c->logentries) {
		free(html);
		return NULL;
	}
	for (size_t i = 0; i < c->logentries_length; i++) {
#define SC_HLF "<div class=result id=log%lu>[<span class=%s>%s</span>] %s " \
		"<a href=\"" SC_I18N_GIT_URL "/src/branch/master/%s#L%lu\">%s()@%s:%lu</a>: %s</div>"
#define SC_HLA i, \
		sc_log_str(c->logentries[i]->type), \
		sc_log_str(c->logentries[i]->type), \
		formatted_time, \
		c->logentries[i]->file, \
		c->logentries[i]->line, \
		c->logentries[i]->function, /* compile-time burned in values are safe from xss :) */ \
		c->logentries[i]->file, \
		c->logentries[i]->line, \
		safemessage /* ... whereas this might contain < */
		struct tm tm;
		char formatted_time[128];
		localtime_r(&c->logentries[i]->time, &tm);
		strftime(formatted_time, 128, SC_I18N_DATETIME_FORMAT, &tm);
		char * safemessage = htmlspecialchars(c->logentries[i]->message);
		size_t ws = snprintf(NULL, 0, SC_HLF, SC_HLA);
		SC_HRC(html, ws);
		html_written += sprintf(html+html_written, SC_HLF, SC_HLA);
		free(safemessage);
	}
	pthread_rwlock_unlock(c->logentries_lock);
	return html;
}
int sc_httpd (void * cls,
													struct MHD_Connection * connection,
													const char * url,
													const char * method,
													const char * version,
													const char * upload_data,
													size_t * upload_data_size,
													void ** ptr) {
	struct sc_cache * c = (struct sc_cache *) cls;
	static int dummy;
	struct MHD_Response * httpd_response;
	int ret;
	if (0 != strcmp(method, "GET"))
		return MHD_NO; /* unexpected method */
	if (&dummy != *ptr) {
		/* the first time only the headers are valid, do not respond in the first round ... */
		*ptr = &dummy;
		return MHD_YES;
	}
	if (0 != *upload_data_size)
		return MHD_NO; /* upload data in a GET?! */
	*ptr = NULL; /* clear context pointer */
	char * response = NULL;
	enum MHD_ResponseMemoryMode mhdrmm = MHD_RESPMEM_MUST_FREE;
	const char * query = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "q");
	const char * host = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Host");
	char * location = "//git.sijanec.eu/sijanec/sear.c";
	char * content_type = "text/html";
	int status_code = MHD_HTTP_OK;
	if (!host)
		host = "";
	struct sc_query * q = NULL;
	if (!query) {
		if (url[0] == '/')
			switch (url[1]) {
				case 's': /* security.txt */
				case '.': /* .well-known/security.txt */
					mhdrmm = MHD_RESPMEM_PERSISTENT;
					response = sc_securitytxt;
					content_type = "text/plain";
					break;
				case 'r': /* robots.txt */
					mhdrmm = MHD_RESPMEM_PERSISTENT;
					response = sc_robotstxt;
					content_type = "text/plain";
					break;
				case 'o': /* osdd.xml - opensearch description document */
					response = malloc(strlen(sc_osdd)+strlen(host));
					sprintf(response, sc_osdd, host);
					content_type = "application/opensearchdescription+xml";
					break;
				case 'l': /* logs.html */
					{
						char * logshtml = sc_logshtml(c);
						response = malloc(strlen((char *) sc_hp)+strlen(SC_I18N_LOGS)+strlen(logshtml ? logshtml : SC_I18N_LOGS_ERROR));
						sprintf(response, (char *) sc_hp, "", "", SC_I18N_LOGS, logshtml ? logshtml : SC_I18N_LOGS_ERROR);
						free(logshtml);
					}
					break;
			}
		if (!response) {
			response = malloc(strlen((char *) sc_hp)+strlen(SC_I18N_HP_HEADING)+strlen(SC_I18N_HP_BODY));
			sprintf(response, (char *) sc_hp, "", "", SC_I18N_HP_HEADING, SC_I18N_HP_BODY);
		}
	} else {
		int already_retried = 0;
retry:
		SC_CRLE(c, c->queries_lock);
		for (size_t i = 0; i < c->queries_length; i++)
			if (!strcmp(c->queries[i]->string, query))
				q = c->queries[i];
		if (q) {
			response = sc_queryhtml(q); /* MHD_create_response_from_buffer will free response (; */
			if (MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "f") && q->results_length > 0) {
				status_code = 307;
				location = q->results[0]->url;
			}
			SC_CUE(c, c->queries_lock);
		} else {
			SC_CUE(c, c->queries_lock);
			sc_query_google(query, c, NULL);
			if (already_retried++) {
				char * safequery = htmlspecialchars(query);
				response = malloc(strlen((char*) sc_hp)+strlen(safequery)*2+strlen(SC_I18N_HP_ERROR_HEADING)+strlen(SC_I18N_HP_ERROR_BODY));
				sprintf(response, (char *) sc_hp, safequery, safequery, SC_I18N_HP_ERROR_HEADING, SC_I18N_HP_ERROR_BODY);
				free(safequery);
			} else goto retry;
		}
	}
	httpd_response = MHD_create_response_from_buffer (strlen(response), (void *) response, mhdrmm);
	MHD_add_response_header(httpd_response, "Content-Type", content_type);
	if (status_code >= 300 && status_code <= 399)
		MHD_add_response_header(httpd_response, "Location", location);
	ret = MHD_queue_response(connection, status_code, httpd_response);
	MHD_destroy_response(httpd_response);
	return ret;
}