#define SC_CAPI(c, b, h, e, ...) sc_api(c, b, h, 0##__VA_OPT__(1), e __VA_OPT__(,) __VA_ARGS__)
#define SC_CAPIX(c, b, h, e, ...) sc_capix(c, b, h, 0##__VA_OPT__(1), e __VA_OPT__(,) __VA_ARGS__)
char * sc_api (struct sc_cache * c, char * body, char * headers, int isfmt, char * endpoint, ...) {
if (!c || !endpoint)
return NULL;
size_t va_count = parse_printf_format(endpoint, 0, NULL);
char * endpoint_formatted = NULL;
long response_code = 0;
if (isfmt && va_count > 0 && endpoint_formatted == NULL) {
va_list ap, ap2;
va_start(ap, endpoint);
va_copy(ap2, ap);
size_t strlenm = vsnprintf(NULL, 0, endpoint, ap);
endpoint_formatted = malloc(sizeof(char)*strlenm+1);
vsnprintf(endpoint_formatted, strlenm+1, endpoint, ap2);
va_end(ap);
va_end(ap2);
}
if (!headers)
headers = "";
char * hedrs = malloc(sizeof(char)*strlen(headers)+strlen(SC_HTTP_HEADERS)+1);
strcpy(hedrs, SC_HTTP_HEADERS);
strcat(hedrs, headers);
char * contentType = NULL;
char * redir = NULL;
char * buf = malloc(sizeof(char)*SC_HTTP_RBUFSIZE);
size_t buf_sizeof = SC_HTTP_RBUFSIZE;
size_t buf_length = 0;
int readstatus = 0;
void * r = xmlNanoHTTPMethodRedir(
endpoint_formatted ? endpoint_formatted : endpoint,
body ? "POST" : "GET",
body,
&contentType,
&redir,
hedrs,
body ? strlen(body) : 0
);
if (!r) {
SC_LOG(SC_LOG_ERROR, c, "!r, endpoint: %s", endpoint_formatted ? endpoint_formatted : endpoint);
goto rc;
}
response_code = xmlNanoHTTPReturnCode(r);
if (!(response_code - 200 >= 0 && response_code - 200 < 100)) {
SC_LOG(SC_LOG_ERROR, c, "response_code == %ld, endpoint: %s", response_code, endpoint_formatted ? endpoint_formatted:endpoint);
}
while ((readstatus = xmlNanoHTTPRead(r, buf+buf_length, buf_sizeof-buf_length)) > 0) {
buf_length += readstatus;
if (buf_sizeof-buf_length < SC_HTTP_RBUFSIZE) {
buf_sizeof *= SC_REALLOC_K;
buf = realloc(buf, sizeof(char)*buf_sizeof); /* this IS safe, no matter how hard valgrind complains */
}
}
buf[buf_length++] = '\0';
if (readstatus == -1)
SC_LOG(SC_LOG_ERROR, c, "readstatus == -1, endpoint: %s", endpoint_formatted ? endpoint_formatted : endpoint);
xmlNanoHTTPClose(r);
SC_LOG(SC_LOG_DEBUG, c, "contentType = %s, redir = %s", contentType ? contentType : "NULL", redir ? redir : "NULL");
rc:
free(endpoint_formatted);
free(contentType);
free(redir);
free(hedrs);
return buf;
}
htmlDocPtr sc_capix (struct sc_cache * c, char * body, char * headers, int isfmt, char * endpoint, ...) {
if (!c || !endpoint)
return NULL;
size_t va_count = parse_printf_format(endpoint, 0, NULL);
char * endpoint_formatted = NULL;
if (isfmt && va_count > 0 && endpoint_formatted == NULL) {
va_list ap, ap2;
va_start(ap, endpoint);
va_copy(ap2, ap);
size_t strlenm = vsnprintf(NULL, 0, endpoint, ap);
endpoint_formatted = malloc(sizeof(char)*strlenm+1);
vsnprintf(endpoint_formatted, strlenm+1, endpoint, ap2);
va_end(ap);
va_end(ap2);
}
char * buf = sc_api(c, body, headers, 0, endpoint_formatted ? endpoint_formatted : endpoint);
htmlDocPtr htmldoc = parseHtmlDocument(buf, endpoint_formatted ? endpoint_formatted : endpoint);
free(buf);
free(endpoint_formatted);
return htmldoc;
}
char * sc_find_class (char * haystack, const char * definition) { /* you must free class after calling */
if (!haystack || !definition)
return NULL;
char * class = strstr(haystack, definition);
if (!class)
return NULL;
int found = 0;
for (; class > haystack; class--)
if (class[-1] == '.' && (found = 1))
break;
if (!found)
return NULL;
char * endofclass = class;
found = 0;
for (; *endofclass; endofclass++) /* google only has alphanumeric class names. TODO: be pedantic and conformic to w3 stds */
if (!isalnum(endofclass[0]) && (found = 1))
break;
if (!found)
return NULL;
char * toreturn = malloc(endofclass-class+1);
strncpy(toreturn, class, endofclass-class);
toreturn[endofclass-class] = '\0';
return toreturn;
}
int sc_fix_url (char ** h) { /* fixes a (result) URL in-place (removes tracking nonsense, so resulting URL is shorter or equl) */
if (!h || !*h) /* stage 0: prevent accidental death */
return -1;
if (!strncmp(*h, "/url?q=", strlen("/url?q="))) { /* stage 1: url may be tracking url by google results */
*h = *h+strlen("/url?q=");
*strchrnul(*h, '&') = '\0';
urldecode(*h, *h);
}
char * c = NULL;
if ((c = strstr(*h, "googleweblight.com/fp?u="))) { /* stage 2: url may be "light web" tracking url by google results */
*h = c+strlen("googleweblight.com/fp?u="); /* we could disable this with a cookie but meh, this is easier and _stateless_ */
*strchrnul(*h, '&') = '\0';
urldecode(*h, *h);
} /* TODO: be pedantic and remove utm_source and other tracking bullshit */
return 1;
}
struct sc_query * sc_query_google (const char * s, struct sc_cache * c, struct sc_query * q, SC_OPT_TYPE opt) { /* check4cachedB4 */
/* query is in most cases NULL. then it will be allocated and put into sc_cache. otherwise response will be put into passed q. */
/* if query is not NULL, it MUST be initialized */
/*
remarks:
* we are using wap.google.com over HTTP and with a user-agent string of a nokia mobile phone, so we get a lite website
* we determine which class holds a specific value by looking at the css definitions
- result title: the only class that has definition {color:#1967D2;font-size:14px;line-height:16px}
+ A links have this class set, but they have a child SPAN element that then holds the text of the title
+ A href points to a tracking relative link, starting with /url?q=. the q parameter contains the (obv urlencoded) link.
- result date: class has only one definition, {color:#70757a}, but same definition has the class for the settings A link.
+ extract those two classes and find the one that is only present on SPAN text elements.
- result description: once we have the result div, the description is the //table//span with the appropriate class
+ the appropriate class is the only one with {word-break:break-word}. note that this class also describes other elements.
- result div: to get the result div, we need the parent of the parent of the A link of the title.
* result dates are sometimes relative ("an hour ago") and heavily depend on the client location, based on IP.
- we won't parse those yet
* I couldn't find anything with ratings, so we won't parse thouse either yet
* captcha: google knows that this nokia phone we're pretending to be doesn't support javascript
- the request limiting captcha must work on a phone without javascript. it is probably loaded inside an iframe, but has
origin protection, so we can't just solve it client-side. we would have to proxy images and create some sort of a session
based http request-response based user interface so we can ask the user to complete the captcha. this is not yet
implemeted and will be hard work.
*/
int rs = 1;
char * xpath = NULL;
char * descclass = NULL;
char * titleclass = NULL;
char * imageclass = NULL;
htmlDocPtr xmldoc = NULL;
char * txtdoc = NULL;
if (!s || !c) {
rs = -1;
goto rc;
}
int qwasgiven = 0;
if (!q)
q = sc_query_init();
else
qwasgiven++;
char * us = malloc(sizeof(char)*strlen(s)*3+1);
urlencode(us, s);
txtdoc = SC_CAPI(c, NULL, NULL, "http://wap.google.com/search?q=%s&num=100&ie=UTF-8%s", us, (opt&SC_OPT_IMAGE) ? "&tbm=isch" : "");
// fprintf(stdout, "%s\n", txtdoc);
free(us);
if (!txtdoc) {
SC_LOG(SC_LOG_ERROR, c, "!txtdoc");
rs = -2;
goto rc;
}
/* TODO: check if response is asking for a captcha */
if (opt & SC_OPT_IMAGE) {
imageclass = sc_find_class(txtdoc, "{font-family:Roboto,Helvetica,Arial,sans-serif}");
if (!imageclass) {
SC_LOG(SC_LOG_ERROR, c, "!imageclass, txtdoc = %s", txtdoc);
rs = -3;
goto rc;
}
} else {
titleclass = sc_find_class(txtdoc, "{color:#1967D2;font-size:14px;line-height:16px}");
descclass = sc_find_class(txtdoc, "{word-break:break-word}");
if (!titleclass || !descclass) {
SC_LOG(SC_LOG_ERROR, c, "!titleclass || !descclass, txtdoc = %s", txtdoc);
rs = -4;
goto rc;
}
}
#define SC_GTXF "/html/body//a[contains(@class, '%s')]" /* result a */
#define SC_GTXD /* description */ "../..//table//span[@class='%s']"
#define SC_GTXB /* breadcrumbs */ ".//span[@class='%s']"
#define SC_GTXI "//div[@class='%s']//a"
#define SC_GTR q->results[q->results_length-1]
xpath = malloc(strlen((opt & SC_OPT_IMAGE) ? imageclass : titleclass)+strlen((opt & SC_OPT_IMAGE) ? SC_GTXI : SC_GTXF));
sprintf(xpath, (opt & SC_OPT_IMAGE) ? SC_GTXI : SC_GTXF, (opt & SC_OPT_IMAGE) ? imageclass : titleclass);
xmldoc = parseHtmlDocument(txtdoc, NULL);
if (qwasgiven) /* as you can see, when q is given, queries will be write-locked for the whole XML processing time! */
SC_CWLE(c, c->queries_lock);
q->results_length = 0;
gnu_code_start;
void sc_query_google_eachnode (xmlNodePtr node, void * data) {
if (node->type == XML_ELEMENT_NODE) {
xmlAttrPtr href = xmlHasProp(node, BAD_CAST "href");
if (href) {
char * hreflink = (char *) xmlGetProp(node, BAD_CAST "href"); /* xmlGetProp copies and allocates */
if (!hreflink) {
SC_LOG(SC_LOG_ERROR, c, "!hreflink");
rs = -5;
return;
}
if (opt & SC_OPT_IMAGE) {
char * imgurl = NULL; /* do not free those when allocated by sscanf, as they will directly go into the struct. */
char * imgrefurl = NULL; /* easy, huh? */
SC_LOG(SC_LOG_DEBUG, c, "hreflink = %s", hreflink);
sscanf(hreflink, "/imgres?imgurl=%m[^&]&imgrefurl=%m[^&]", &imgurl, &imgrefurl);
if (!imgurl && !imgrefurl) {
SC_LOG(SC_LOG_ERROR, c, "!imgurl && !imgrefurl, txtdoc = %s", txtdoc);
/* rs = -6; */ /* we continue running not fail because of a single picture */
free(imgurl);
free(imgrefurl);
return; /* check! */
}
urldecode(imgurl, imgurl);
urldecode(imgrefurl, imgrefurl);
if (q->results_sizeof <= q->results_length)
SC_BIGGER_ARRAY(q->results, sc_result, 1);
q->results_length++;
SC_GTR->query = q;
SC_GTR->title = NULL; /* can't get title from here, would have to load /imgres, which is bloat */
SC_GTR->url = imgrefurl;
SC_GTR->desc = imgurl;
SC_GTR->breadcrumbs = NULL;
} else {
char * orig_hreflink_for_free = hreflink;
sc_fix_url(&hreflink);
char * x = malloc(strlen(descclass)+strlen(SC_GTXD));
char * xbread = malloc(strlen(descclass)+strlen(SC_GTXB));
sprintf(x, SC_GTXD, descclass /* remember, kids, GNU C is fucking legendary */);
sprintf(xbread, SC_GTXB, descclass /* remember, kids, GNU C is fucking legendary */);
xmlNodePtr descnode = nthNodeXN(node, x, 0);
if (!descnode) /* description may be above, see https://support.google.com/websearch?p=featured_snippets */
descnode = nthNodeXN(node, "../../div/div", 0);
xmlNodePtr breadnode = nthNodeXN(node, xbread, 0);
free(x);
free(xbread);
if (q->results_sizeof <= q->results_length)
SC_BIGGER_ARRAY(q->results, sc_result, 1);
q->results_length++;
SC_GTR->query = q;
char * cp = (char *) xmlNodeGetContent(node->children);
if (cp) {
SC_GTR->title = malloc(strlen(cp)+1);
strcpy(SC_GTR->title, cp);
xmlFree(cp);
} else SC_GTR->title = NULL;
if (hreflink) {
SC_GTR->url = malloc(strlen(hreflink)+1);
strcpy(SC_GTR->url, hreflink);
xmlFree(orig_hreflink_for_free);
} else SC_GTR->url = NULL;
cp = (char *) xmlNodeGetContent(descnode);
if (cp) {
SC_GTR->desc = malloc(strlen(cp)+1);
strcpy(SC_GTR->desc, cp);
xmlFree(cp);
} else SC_GTR->desc = NULL;
cp = (char *) xmlNodeGetContent(breadnode);
if (cp) {
SC_GTR->breadcrumbs = malloc(strlen(cp)+1);
strcpy(SC_GTR->breadcrumbs, cp);
xmlFree(cp);
}
}
}
}
}
eachNodeX(xmldoc, xpath, sc_query_google_eachnode, NULL);
gnu_code_end;
if (rs < 0) {
SC_LOG(SC_LOG_ERROR, c, "rs < 0 (rs == %d)", rs);
if (qwasgiven)
SC_CUE(c, c->queries_lock);
goto rc;
}
q->cache = c;
q->lookup_time = time(NULL);
q->engines = SC_ENGINE_GOOGLE;
q->string = realloc(q->string, strlen(s)+1);
q->opt = opt;
strcpy(q->string, s);
if (!qwasgiven) {
SC_CWLE(c, c->queries_lock);
if (c->queries_sizeof <= c->queries_length)
SC_BIGGER_ARRAY(c->queries, sc_query, 0);
c->queries_length++;
#define SC_GTQ c->queries[c->queries_length-1]
SC_GTQ = q;
}
SC_CUE(c, c->queries_lock);
rc:
if (!qwasgiven && rs < 0)
sc_query_free(q);
xmlFreeDoc(xmldoc);
free(txtdoc);
free(titleclass);
free(descclass);
free(imageclass);
free(xpath);
return (rs < 0) ? NULL : q;
}
