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fix: refactored scraping components

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This commit is contained in:
frosty
2026-03-17 13:51:12 -04:00
parent 8c6632502f
commit c7b95d0571
8 changed files with 816 additions and 700 deletions
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7
src/Config.h
View File

@@ -23,6 +23,13 @@
#define INFOBOX_FIELD_COUNT 4
#define MAX_RESULTS_PER_ENGINE 10
#define CURL_TIMEOUT_SECS 15L
#define CURL_DNS_TIMEOUT_SECS 300L
#define BING_IMAGE_URL "https://www.bing.com/images/search"
#define IMAGE_RESULTS_PER_PAGE 32
#define IMAGE_RESULT_FIELDS 4
typedef struct {
char host[256];
int port;

245
src/Routes/Images.c
View File

@@ -1,15 +1,7 @@
#include "Images.h"
#include "../Scraping/Scraping.h"
#include "../Utility/HttpClient.h"
#include "../Scraping/ImageScraping.h"
#include "../Utility/Unescape.h"
#include "../Utility/XmlHelper.h"
#include <curl/curl.h>
#include <libxml/HTMLparser.h>
#include <libxml/xpath.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Config.h"
int images_handler(UrlParams *params) {
TemplateContext ctx = new_context();
@@ -28,12 +20,12 @@ int images_handler(UrlParams *params) {
}
}
context_set(&ctx, "query", raw_query);
char page_str[16], prev_str[16], next_str[16];
snprintf(page_str, sizeof(page_str), "%d", page);
snprintf(prev_str, sizeof(prev_str), "%d", page > 1 ? page - 1 : 0);
snprintf(next_str, sizeof(next_str), "%d", page + 1);
context_set(&ctx, "query", raw_query);
context_set(&ctx, "page", page_str);
context_set(&ctx, "prev_page", prev_str);
context_set(&ctx, "next_page", next_str);
@@ -49,208 +41,41 @@ int images_handler(UrlParams *params) {
return -1;
}
CURL *tmp = curl_easy_init();
if (!tmp) {
send_response("<h1>Error initializing curl</h1>");
if (display_query)
free(display_query);
free_context(&ctx);
return -1;
}
char *encoded_query = curl_easy_escape(tmp, raw_query, 0);
curl_easy_cleanup(tmp);
ImageResult *results = NULL;
int result_count = 0;
if (!encoded_query) {
send_response("<h1>Error encoding query</h1>");
if (display_query)
free(display_query);
free_context(&ctx);
return -1;
}
char url[1024];
int first = (page - 1) * 32 + 1;
snprintf(url, sizeof(url), "https://www.bing.com/images/search?q=%s&first=%d",
encoded_query, first);
HttpResponse resp = http_get(
url,
"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko");
if (!resp.memory) {
if (scrape_images(raw_query, page, &results, &result_count) != 0 ||
!results) {
send_response("<h1>Error fetching images</h1>");
free(encoded_query);
free(display_query);
free_context(&ctx);
return -1;
}
htmlDocPtr doc = htmlReadMemory(resp.memory, resp.size, NULL, NULL,
HTML_PARSE_RECOVER | HTML_PARSE_NOERROR);
if (!doc) {
http_response_free(&resp);
free(encoded_query);
free(display_query);
free_context(&ctx);
return -1;
}
char ***image_matrix = malloc(sizeof(char **) * result_count);
int *inner_counts = malloc(sizeof(int) * result_count);
xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
if (!xpathCtx) {
xmlFreeDoc(doc);
http_response_free(&resp);
free(encoded_query);
free(display_query);
free_context(&ctx);
return -1;
}
xmlXPathObjectPtr xpathObj =
xmlXPathEvalExpression((const xmlChar *)"//div[@class='item']", xpathCtx);
int image_count = 0;
char ***image_matrix = NULL;
int *inner_counts = NULL;
if (xpathObj && xpathObj->nodesetval) {
int nodes = xpathObj->nodesetval->nodeNr;
int max_images = (nodes < 32) ? nodes : 32;
image_matrix = malloc(sizeof(char **) * max_images);
inner_counts = malloc(sizeof(int) * max_images);
if (!image_matrix || !inner_counts) {
if (image_matrix) free(image_matrix);
if (inner_counts) free(inner_counts);
image_matrix = NULL;
inner_counts = NULL;
if (image_matrix)
free(image_matrix);
if (inner_counts)
free(inner_counts);
free_image_results(results, result_count);
free(display_query);
free_context(&ctx);
return -1;
}
for (int i = 0; i < nodes; i++) {
if (image_count >= 32)
break;
xmlNodePtr node = xpathObj->nodesetval->nodeTab[i];
xmlNodePtr img_node = NULL;
xmlNodePtr tit_node = NULL;
xmlNodePtr des_node = NULL;
xmlNodePtr thumb_link = NULL;
for (xmlNodePtr child = node->children; child; child = child->next) {
if (child->type != XML_ELEMENT_NODE)
continue;
if (xmlStrcmp(child->name, (const xmlChar *)"a") == 0) {
xmlChar *class = xmlGetProp(child, (const xmlChar *)"class");
if (class) {
if (xmlStrstr(class, (const xmlChar *)"thumb") != NULL) {
thumb_link = child;
for (xmlNodePtr thumb_child = child->children; thumb_child;
thumb_child = thumb_child->next) {
if (xmlStrcmp(thumb_child->name, (const xmlChar *)"div") == 0) {
xmlChar *div_class =
xmlGetProp(thumb_child, (const xmlChar *)"class");
if (div_class &&
xmlStrcmp(div_class, (const xmlChar *)"cico") == 0) {
for (xmlNodePtr cico_child = thumb_child->children;
cico_child; cico_child = cico_child->next) {
if (xmlStrcmp(cico_child->name, (const xmlChar *)"img") ==
0) {
img_node = cico_child;
break;
}
}
}
if (div_class)
xmlFree(div_class);
}
}
} else if (xmlStrstr(class, (const xmlChar *)"tit") != NULL) {
tit_node = child;
}
xmlFree(class);
}
} else if (xmlStrcmp(child->name, (const xmlChar *)"div") == 0) {
xmlChar *class = xmlGetProp(child, (const xmlChar *)"class");
if (class && xmlStrcmp(class, (const xmlChar *)"meta") == 0) {
for (xmlNodePtr meta_child = child->children; meta_child;
meta_child = meta_child->next) {
if (xmlStrcmp(meta_child->name, (const xmlChar *)"div") == 0) {
xmlChar *div_class =
xmlGetProp(meta_child, (const xmlChar *)"class");
if (div_class) {
if (xmlStrcmp(div_class, (const xmlChar *)"des") == 0) {
des_node = meta_child;
}
xmlFree(div_class);
}
} else if (xmlStrcmp(meta_child->name, (const xmlChar *)"a") ==
0) {
xmlChar *a_class =
xmlGetProp(meta_child, (const xmlChar *)"class");
if (a_class &&
xmlStrstr(a_class, (const xmlChar *)"tit") != NULL) {
tit_node = meta_child;
}
if (a_class)
xmlFree(a_class);
}
}
}
if (class)
xmlFree(class);
}
for (int i = 0; i < result_count; i++) {
image_matrix[i] = malloc(sizeof(char *) * IMAGE_RESULT_FIELDS);
image_matrix[i][0] = strdup(results[i].thumbnail_url);
image_matrix[i][1] = strdup(results[i].title);
image_matrix[i][2] = strdup(results[i].page_url);
image_matrix[i][3] = strdup(results[i].full_url);
inner_counts[i] = IMAGE_RESULT_FIELDS;
}
xmlChar *iurl =
img_node ? xmlGetProp(img_node, (const xmlChar *)"src") : NULL;
xmlChar *full_url =
thumb_link ? xmlGetProp(thumb_link, (const xmlChar *)"href") : NULL;
xmlChar *title = des_node
? xmlNodeGetContent(des_node)
: (tit_node ? xmlNodeGetContent(tit_node) : NULL);
xmlChar *rurl =
tit_node ? xmlGetProp(tit_node, (const xmlChar *)"href") : NULL;
if (iurl && strlen((char *)iurl) > 0) {
char *proxy_url = NULL;
CURL *esc_curl = curl_easy_init();
if (esc_curl) {
char *encoded = curl_easy_escape(esc_curl, (char *)iurl, 0);
if (encoded) {
size_t proxy_len = strlen("/proxy?url=") + strlen(encoded) + 1;
proxy_url = malloc(proxy_len);
if (proxy_url) {
snprintf(proxy_url, proxy_len, "/proxy?url=%s", encoded);
}
curl_free(encoded);
}
curl_easy_cleanup(esc_curl);
}
image_matrix[image_count] = malloc(sizeof(char *) * 4);
image_matrix[image_count][0] =
proxy_url ? strdup(proxy_url) : strdup((char *)iurl);
free(proxy_url);
image_matrix[image_count][1] = strdup(title ? (char *)title : "Image");
image_matrix[image_count][2] = strdup(rurl ? (char *)rurl : "#");
image_matrix[image_count][3] =
strdup(full_url ? (char *)full_url : "#");
inner_counts[image_count] = 4;
image_count++;
}
if (iurl)
xmlFree(iurl);
if (title)
xmlFree(title);
if (rurl)
xmlFree(rurl);
if (full_url)
xmlFree(full_url);
}
}
context_set_array_of_arrays(&ctx, "images", image_matrix, image_count,
context_set_array_of_arrays(&ctx, "images", image_matrix, result_count,
inner_counts);
char *rendered = render_template("images.html", &ctx);
@@ -261,27 +86,15 @@ int images_handler(UrlParams *params) {
send_response("<h1>Error rendering image results</h1>");
}
if (image_matrix) {
for (int i = 0; i < image_count; i++) {
for (int j = 0; j < 4; j++) {
for (int i = 0; i < result_count; i++) {
for (int j = 0; j < IMAGE_RESULT_FIELDS; j++)
free(image_matrix[i][j]);
}
free(image_matrix[i]);
}
free(image_matrix);
}
if (inner_counts) {
free(inner_counts);
}
if (xpathObj)
xmlXPathFreeObject(xpathObj);
if (xpathCtx)
xmlXPathFreeContext(xpathCtx);
if (doc)
xmlFreeDoc(doc);
http_response_free(&resp);
curl_free(encoded_query);
free_image_results(results, result_count);
free(display_query);
free_context(&ctx);

239
src/Scraping/ImageScraping.c Normal file
View File

@@ -0,0 +1,239 @@
#include "ImageScraping.h"
#include "../Utility/HttpClient.h"
#include "Config.h"
#include <libxml/HTMLparser.h>
#include <libxml/xpath.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static char *build_proxy_url(const char *image_url) {
if (!image_url)
return NULL;
char *proxy_url = NULL;
CURL *curl = curl_easy_init();
if (curl) {
char *encoded = curl_easy_escape(curl, (char *)image_url, 0);
if (encoded) {
size_t len = strlen("/proxy?url=") + strlen(encoded) + 1;
proxy_url = malloc(len);
if (proxy_url)
snprintf(proxy_url, len, "/proxy?url=%s", encoded);
curl_free(encoded);
}
curl_easy_cleanup(curl);
}
return proxy_url;
}
static int parse_image_node(xmlNodePtr node, ImageResult *result) {
xmlNodePtr img_node = NULL;
xmlNodePtr tit_node = NULL;
xmlNodePtr des_node = NULL;
xmlNodePtr thumb_link = NULL;
for (xmlNodePtr child = node->children; child; child = child->next) {
if (child->type != XML_ELEMENT_NODE)
continue;
if (xmlStrcmp(child->name, (const xmlChar *)"a") == 0) {
xmlChar *class = xmlGetProp(child, (const xmlChar *)"class");
if (class) {
if (xmlStrstr(class, (const xmlChar *)"thumb") != NULL) {
thumb_link = child;
for (xmlNodePtr thumb_child = child->children; thumb_child;
thumb_child = thumb_child->next) {
if (xmlStrcmp(thumb_child->name, (const xmlChar *)"div") == 0) {
xmlChar *div_class =
xmlGetProp(thumb_child, (const xmlChar *)"class");
if (div_class &&
xmlStrcmp(div_class, (const xmlChar *)"cico") == 0) {
for (xmlNodePtr cico_child = thumb_child->children; cico_child;
cico_child = cico_child->next) {
if (xmlStrcmp(cico_child->name, (const xmlChar *)"img") ==
0) {
img_node = cico_child;
break;
}
}
}
if (div_class)
xmlFree(div_class);
}
}
} else if (xmlStrstr(class, (const xmlChar *)"tit") != NULL) {
tit_node = child;
}
xmlFree(class);
}
} else if (xmlStrcmp(child->name, (const xmlChar *)"div") == 0) {
xmlChar *class = xmlGetProp(child, (const xmlChar *)"class");
if (class && xmlStrcmp(class, (const xmlChar *)"meta") == 0) {
for (xmlNodePtr meta_child = child->children; meta_child;
meta_child = meta_child->next) {
if (xmlStrcmp(meta_child->name, (const xmlChar *)"div") == 0) {
xmlChar *div_class =
xmlGetProp(meta_child, (const xmlChar *)"class");
if (div_class) {
if (xmlStrcmp(div_class, (const xmlChar *)"des") == 0) {
des_node = meta_child;
}
xmlFree(div_class);
}
} else if (xmlStrcmp(meta_child->name, (const xmlChar *)"a") == 0) {
xmlChar *a_class = xmlGetProp(meta_child, (const xmlChar *)"class");
if (a_class && xmlStrstr(a_class, (const xmlChar *)"tit") != NULL) {
tit_node = meta_child;
}
if (a_class)
xmlFree(a_class);
}
}
}
if (class)
xmlFree(class);
}
}
xmlChar *iurl =
img_node ? xmlGetProp(img_node, (const xmlChar *)"src") : NULL;
xmlChar *full_url =
thumb_link ? xmlGetProp(thumb_link, (const xmlChar *)"href") : NULL;
xmlChar *title = des_node ? xmlNodeGetContent(des_node)
: (tit_node ? xmlNodeGetContent(tit_node) : NULL);
xmlChar *rurl =
tit_node ? xmlGetProp(tit_node, (const xmlChar *)"href") : NULL;
if (!iurl || strlen((char *)iurl) == 0) {
if (iurl)
xmlFree(iurl);
if (title)
xmlFree(title);
if (rurl)
xmlFree(rurl);
if (full_url)
xmlFree(full_url);
return 0;
}
char *proxy_url = build_proxy_url((char *)iurl);
result->thumbnail_url = proxy_url ? strdup(proxy_url) : strdup((char *)iurl);
free(proxy_url);
result->title = strdup(title ? (char *)title : "Image");
result->page_url = strdup(rurl ? (char *)rurl : "#");
result->full_url = strdup(full_url ? (char *)full_url : "#");
if (iurl)
xmlFree(iurl);
if (title)
xmlFree(title);
if (rurl)
xmlFree(rurl);
if (full_url)
xmlFree(full_url);
return 1;
}
int scrape_images(const char *query, int page, ImageResult **out_results,
int *out_count) {
*out_results = NULL;
*out_count = 0;
if (!query || strlen(query) == 0)
return -1;
CURL *tmp = curl_easy_init();
if (!tmp)
return -1;
char *encoded_query = curl_easy_escape(tmp, query, 0);
curl_easy_cleanup(tmp);
if (!encoded_query)
return -1;
char url[BUFFER_SIZE_LARGE];
int first = (page - 1) * IMAGE_RESULTS_PER_PAGE + 1;
snprintf(url, sizeof(url), "%s?q=%s&first=%d", BING_IMAGE_URL, encoded_query,
first);
free(encoded_query);
HttpResponse resp = http_get(
url,
"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko");
if (!resp.memory) {
return -1;
}
htmlDocPtr doc = htmlReadMemory(resp.memory, resp.size, NULL, NULL,
HTML_PARSE_RECOVER | HTML_PARSE_NOERROR);
if (!doc) {
http_response_free(&resp);
return -1;
}
xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
if (!xpathCtx) {
xmlFreeDoc(doc);
http_response_free(&resp);
return -1;
}
xmlXPathObjectPtr xpathObj =
xmlXPathEvalExpression((const xmlChar *)"//div[@class='item']", xpathCtx);
if (!xpathObj || !xpathObj->nodesetval) {
if (xpathObj)
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
xmlFreeDoc(doc);
http_response_free(&resp);
return 0;
}
int nodes = xpathObj->nodesetval->nodeNr;
int max_images =
(nodes < IMAGE_RESULTS_PER_PAGE) ? nodes : IMAGE_RESULTS_PER_PAGE;
ImageResult *results = malloc(sizeof(ImageResult) * max_images);
if (!results) {
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
xmlFreeDoc(doc);
http_response_free(&resp);
return -1;
}
int count = 0;
for (int i = 0; i < nodes && count < IMAGE_RESULTS_PER_PAGE; i++) {
xmlNodePtr node = xpathObj->nodesetval->nodeTab[i];
if (parse_image_node(node, &results[count])) {
count++;
}
}
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
xmlFreeDoc(doc);
http_response_free(&resp);
*out_results = results;
*out_count = count;
return 0;
}
void free_image_results(ImageResult *results, int count) {
if (!results)
return;
for (int i = 0; i < count; i++) {
free(results[i].thumbnail_url);
free(results[i].title);
free(results[i].page_url);
free(results[i].full_url);
}
free(results);
}

18
src/Scraping/ImageScraping.h Normal file
View File

@@ -0,0 +1,18 @@
#ifndef IMAGESCRAPING_H
#define IMAGESCRAPING_H
#include <curl/curl.h>
#include <libxml/HTMLparser.h>
typedef struct {
char *thumbnail_url;
char *title;
char *page_url;
char *full_url;
} ImageResult;
int scrape_images(const char *query, int page, ImageResult **out_results,
int *out_count);
void free_image_results(ImageResult *results, int count);
#endif

527
src/Scraping/Scraping.c
View File

@@ -1,395 +1,20 @@
#include "Scraping.h"
#include "../Cache/Cache.h"
#include "../Proxy/Proxy.h"
#include "../Utility/Unescape.h"
#include "../Utility/XmlHelper.h"
#include "Config.h"
#include <curl/curl.h>
#include <libxml/HTMLparser.h>
#include <libxml/xpath.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb,
void *userp) {
size_t realsize = size * nmemb;
MemoryBuffer *mem = (MemoryBuffer *)userp;
if (mem->size + realsize + 1 > mem->capacity) {
size_t new_cap =
mem->capacity == 0 ? INITIAL_BUFFER_SIZE : mem->capacity * 2;
while (new_cap < mem->size + realsize + 1)
new_cap *= 2;
char *ptr = (char *)realloc(mem->memory, new_cap);
if (!ptr) {
int check_cache_for_job(ScrapeJob *job) {
if (get_cache_ttl_search() <= 0)
return 0;
}
mem->memory = ptr;
mem->capacity = new_cap;
}
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
static const char *get_random_user_agent(void) {
static const char *agents[] = {
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, "
"like Gecko) Chrome/120.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 "
"(KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like "
"Gecko) "
"Chrome/120.0.0.0` Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 "
"Firefox/121.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 "
"(KHTML, like Gecko) Version/17.2 Safari/605.1.15"};
return agents[rand() % 5];
}
static int parse_ddg_lite(const char *engine_name, xmlDocPtr doc,
SearchResult **out_results, int max_results) {
(void)engine_name;
int found_count = 0;
xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
if (!xpathCtx) {
return 0;
}
xmlXPathObjectPtr xpathObj = xml_xpath_eval(
xpathCtx, "//tr[not(contains(@class, "
"'result-sponsored'))]//a[@class='result-link']");
if (!xpathObj || !xpathObj->nodesetval || xpathObj->nodesetval->nodeNr == 0) {
if (xpathObj)
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
int num_links = xpathObj->nodesetval->nodeNr;
*out_results = xml_result_alloc(num_links, max_results);
if (!*out_results) {
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
for (int i = 0; i < num_links && found_count < max_results; i++) {
xmlNodePtr linkNode = xpathObj->nodesetval->nodeTab[i];
char *title = xml_node_content(linkNode);
char *url = (char *)xmlGetProp(linkNode, (xmlChar *)"href");
char *snippet_text = NULL;
xmlNodePtr current = linkNode->parent;
while (current && xmlStrcasecmp(current->name, (const xmlChar *)"tr") != 0)
current = current->parent;
if (current && current->next) {
xmlNodePtr snippetRow = current->next;
while (snippetRow &&
xmlStrcasecmp(snippetRow->name, (const xmlChar *)"tr") != 0)
snippetRow = snippetRow->next;
if (snippetRow) {
xpathCtx->node = snippetRow;
xmlXPathObjectPtr sObj =
xml_xpath_eval(xpathCtx, ".//td[@class='result-snippet']");
if (sObj && sObj->nodesetval && sObj->nodesetval->nodeNr > 0) {
snippet_text = xml_node_content(sObj->nodesetval->nodeTab[0]);
}
if (sObj)
xmlXPathFreeObject(sObj);
xpathCtx->node = NULL;
}
}
(*out_results)[found_count].url = unescape_search_url(url);
(*out_results)[found_count].title = strdup(title ? title : "No Title");
(*out_results)[found_count].snippet =
strdup(snippet_text ? snippet_text : "");
found_count++;
if (title)
xmlFree(title);
if (url)
xmlFree(url);
if (snippet_text)
xmlFree(snippet_text);
}
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return found_count;
}
static int parse_startpage(const char *engine_name, xmlDocPtr doc,
SearchResult **out_results, int max_results) {
(void)engine_name;
int found_count = 0;
xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
if (!xpathCtx) {
return 0;
}
xmlXPathObjectPtr xpathObj =
xml_xpath_eval(xpathCtx, "//div[contains(@class, 'result')]");
if (!xpathObj || !xpathObj->nodesetval || xpathObj->nodesetval->nodeNr == 0) {
if (xpathObj)
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
int num_results = xpathObj->nodesetval->nodeNr;
*out_results = xml_result_alloc(num_results, max_results);
if (!*out_results) {
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
for (int i = 0; i < num_results && found_count < max_results; i++) {
xmlNodePtr resultNode = xpathObj->nodesetval->nodeTab[i];
xpathCtx->node = resultNode;
xmlXPathObjectPtr linkObj =
xml_xpath_eval(xpathCtx, ".//a[contains(@class, 'result-link')]");
char *url =
(linkObj && linkObj->nodesetval && linkObj->nodesetval->nodeNr > 0)
? (char *)xmlGetProp(linkObj->nodesetval->nodeTab[0],
(xmlChar *)"href")
: NULL;
xmlXPathObjectPtr titleObj =
xml_xpath_eval(xpathCtx, ".//h2[contains(@class, 'wgl-title')]");
char *title =
(titleObj && titleObj->nodesetval && titleObj->nodesetval->nodeNr > 0)
? xml_node_content(titleObj->nodesetval->nodeTab[0])
: NULL;
xmlXPathObjectPtr snippetObj =
xml_xpath_eval(xpathCtx, ".//p[contains(@class, 'description')]");
char *snippet_text =
(snippetObj && snippetObj->nodesetval &&
snippetObj->nodesetval->nodeNr > 0)
? xml_node_content(snippetObj->nodesetval->nodeTab[0])
: NULL;
if (url && title) {
(*out_results)[found_count].url = strdup(url);
(*out_results)[found_count].title = strdup(title);
(*out_results)[found_count].snippet =
strdup(snippet_text ? snippet_text : "");
found_count++;
}
if (title)
xmlFree(title);
if (url)
xmlFree(url);
if (snippet_text)
xmlFree(snippet_text);
if (linkObj)
xmlXPathFreeObject(linkObj);
if (titleObj)
xmlXPathFreeObject(titleObj);
if (snippetObj)
xmlXPathFreeObject(snippetObj);
}
xpathCtx->node = NULL;
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return found_count;
}
static int parse_yahoo(const char *engine_name, xmlDocPtr doc,
SearchResult **out_results, int max_results) {
(void)engine_name;
int found_count = 0;
xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
if (!xpathCtx) {
return 0;
}
xmlXPathObjectPtr xpathObj =
xml_xpath_eval(xpathCtx, "//div[contains(@class, 'algo-sr')]");
if (!xpathObj || !xpathObj->nodesetval || xpathObj->nodesetval->nodeNr == 0) {
if (xpathObj)
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
int num_results = xpathObj->nodesetval->nodeNr;
*out_results = xml_result_alloc(num_results, max_results);
if (!*out_results) {
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
for (int i = 0; i < num_results && found_count < max_results; i++) {
xmlNodePtr resultNode = xpathObj->nodesetval->nodeTab[i];
xpathCtx->node = resultNode;
xmlXPathObjectPtr linkObj = xml_xpath_eval(
xpathCtx, ".//div[contains(@class, 'compTitle')]//a[@target='_blank']");
char *url =
(linkObj && linkObj->nodesetval && linkObj->nodesetval->nodeNr > 0)
? (char *)xmlGetProp(linkObj->nodesetval->nodeTab[0],
(xmlChar *)"href")
: NULL;
xmlXPathObjectPtr titleObj =
xml_xpath_eval(xpathCtx, ".//h3[contains(@class, 'title')]");
char *title =
(titleObj && titleObj->nodesetval && titleObj->nodesetval->nodeNr > 0)
? xml_node_content(titleObj->nodesetval->nodeTab[0])
: NULL;
xmlXPathObjectPtr snippetObj =
xml_xpath_eval(xpathCtx, ".//div[contains(@class, 'compText')]//p");
char *snippet_text =
(snippetObj && snippetObj->nodesetval &&
snippetObj->nodesetval->nodeNr > 0)
? xml_node_content(snippetObj->nodesetval->nodeTab[0])
: NULL;
if (url && title) {
(*out_results)[found_count].url = unescape_search_url(url);
(*out_results)[found_count].title = strdup(title);
(*out_results)[found_count].snippet =
strdup(snippet_text ? snippet_text : "");
found_count++;
}
if (title)
xmlFree(title);
if (url)
xmlFree(url);
if (snippet_text)
xmlFree(snippet_text);
if (linkObj)
xmlXPathFreeObject(linkObj);
if (titleObj)
xmlXPathFreeObject(titleObj);
if (snippetObj)
xmlXPathFreeObject(snippetObj);
}
xpathCtx->node = NULL;
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return found_count;
}
const SearchEngine ENGINE_REGISTRY[] = {
{.name = "DuckDuckGo Lite",
.base_url = "https://lite.duckduckgo.com/lite/?q=",
.host_header = "lite.duckduckgo.com",
.referer = "https://lite.duckduckgo.com/",
.page_param = "s",
.page_multiplier = 30,
.page_base = 0,
.parser = parse_ddg_lite},
{.name = "Startpage",
.base_url = "https://www.startpage.com/sp/search?q=",
.host_header = "www.startpage.com",
.referer = "https://www.startpage.com/",
.page_param = "page",
.page_multiplier = 1,
.page_base = 1,
.parser = parse_startpage},
{.name = "Yahoo",
.base_url = "https://search.yahoo.com/search?p=",
.host_header = "search.yahoo.com",
.referer = "https://search.yahoo.com/",
.page_param = "b",
.page_multiplier = 10,
.page_base = 1,
.parser = parse_yahoo}};
const int ENGINE_COUNT = sizeof(ENGINE_REGISTRY) / sizeof(SearchEngine);
#define CURL_TIMEOUT 15L
#define CURL_DNS_TIMEOUT 300L
static void configure_curl_handle(CURL *curl, const char *full_url,
MemoryBuffer *chunk,
struct curl_slist *headers) {
curl_easy_setopt(curl, CURLOPT_URL, full_url);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)chunk);
curl_easy_setopt(curl, CURLOPT_USERAGENT, get_random_user_agent());
curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
curl_easy_setopt(curl, CURLOPT_DNS_CACHE_TIMEOUT, CURL_DNS_TIMEOUT);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, CURL_TIMEOUT);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "");
apply_proxy_settings(curl);
}
static char *build_search_url(const char *base_url, const char *page_param,
int page_multiplier, int page_base,
const char *encoded_query, int page) {
int page_value = (page < 1 ? 1 : page - 1) * page_multiplier + page_base;
char *url = malloc(BUFFER_SIZE_LARGE);
if (!url) {
return NULL;
}
snprintf(url, BUFFER_SIZE_LARGE, "%s%s&%s=%d", base_url, encoded_query,
page_param, page_value);
return url;
}
static struct curl_slist *build_request_headers(const char *host_header,
const char *referer) {
struct curl_slist *headers = NULL;
char host_buf[BUFFER_SIZE_MEDIUM], ref_buf[BUFFER_SIZE_MEDIUM];
snprintf(host_buf, sizeof(host_buf), "Host: %s", host_header);
snprintf(ref_buf, sizeof(ref_buf), "Referer: %s", referer);
headers = curl_slist_append(headers, host_buf);
headers = curl_slist_append(headers, ref_buf);
headers = curl_slist_append(
headers,
"Accept: "
"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
headers = curl_slist_append(headers, "Accept-Language: en-US,en;q=0.5");
headers = curl_slist_append(headers, "DNT: 1");
return headers;
}
static int check_cache_for_job(ScrapeJob *job) {
if (get_cache_ttl_search() <= 0) {
return 0;
}
char *key = cache_compute_key(job->query, job->page, job->engine->name);
if (!key) {
if (!key)
return 0;
}
char *cached_data = NULL;
size_t cached_size = 0;
@@ -414,13 +39,16 @@ static int check_cache_for_job(ScrapeJob *job) {
return 0;
}
static void process_job_response(ScrapeJob *job, CURL *handle, CURLMsg *msg) {
if (msg->data.result == CURLE_OK && job->response.size > 0) {
void parse_and_cache_response(ScrapeJob *job) {
if (job->response.size == 0) {
job->results_count = 0;
return;
}
char *key = cache_compute_key(job->query, job->page, job->engine->name);
if (key && get_cache_ttl_search() > 0) {
if (key && get_cache_ttl_search() > 0)
cache_set(key, job->response.memory, job->response.size);
free(key);
}
xmlDocPtr doc = htmlReadMemory(
job->response.memory, job->response.size, NULL, NULL,
@@ -430,11 +58,12 @@ static void process_job_response(ScrapeJob *job, CURL *handle, CURLMsg *msg) {
job->results_count = job->engine->parser(
job->engine->name, doc, job->out_results, job->max_results);
xmlFreeDoc(doc);
}
} else {
job->results_count = 0;
}
}
void cleanup_job_handle(ScrapeJob *job, CURL *handle) {
struct curl_slist *headers = NULL;
curl_easy_getinfo(handle, CURLINFO_PRIVATE, &headers);
if (headers)
@@ -444,35 +73,29 @@ static void process_job_response(ScrapeJob *job, CURL *handle, CURLMsg *msg) {
job->response.memory = NULL;
}
int scrape_engines_parallel(ScrapeJob *jobs, int num_jobs) {
int retries = 0;
void process_response(ScrapeJob *job, CURL *handle, CURLMsg *msg) {
if (msg->data.result == CURLE_OK)
parse_and_cache_response(job);
else
job->results_count = 0;
retry:
CURLM *multi_handle = curl_multi_init();
if (!multi_handle) {
return -1;
}
cleanup_job_handle(job, handle);
}
for (int i = 0; i < num_jobs; i++) {
ScrapeJob *job = &jobs[i];
if (job->handle) {
int setup_job(ScrapeJob *job, CURLM *multi_handle) {
if (job->handle)
curl_easy_cleanup(job->handle);
job->handle = NULL;
}
if (job->response.memory) {
if (job->response.memory)
free(job->response.memory);
}
if (check_cache_for_job(job)) {
job->results_count = job->results_count > 0 ? job->results_count : 0;
continue;
return 0;
}
char *encoded_query = curl_easy_escape(NULL, job->query, 0);
if (!encoded_query) {
continue;
}
if (!encoded_query)
return -1;
char *full_url =
build_search_url(job->engine->base_url, job->engine->page_param,
@@ -480,14 +103,13 @@ retry:
encoded_query, job->page);
free(encoded_query);
if (!full_url) {
continue;
}
if (!full_url)
return -1;
job->handle = curl_easy_init();
if (!job->handle) {
free(full_url);
continue;
return -1;
}
job->response.memory = (char *)malloc(INITIAL_BUFFER_SIZE);
@@ -502,9 +124,61 @@ retry:
free(full_url);
curl_multi_add_handle(multi_handle, job->handle);
return 0;
}
int handle_responses(CURLM *multi_handle, ScrapeJob *jobs, int num_jobs) {
CURLMsg *msg;
int msgs_left;
while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
if (msg->msg != CURLMSG_DONE)
continue;
CURL *handle = msg->easy_handle;
for (int i = 0; i < num_jobs; i++) {
if (jobs[i].handle && jobs[i].handle == handle) {
process_response(&jobs[i], handle, msg);
curl_multi_remove_handle(multi_handle, handle);
curl_easy_cleanup(handle);
jobs[i].handle = NULL;
break;
}
}
}
usleep(100000 + (rand() % 100000));
return 0;
}
int should_retry(ScrapeJob *jobs, int num_jobs) {
if (proxy_count <= 0)
return 0;
for (int i = 0; i < num_jobs; i++) {
if (jobs[i].results_count == 0 && jobs[i].response.size == 0)
return 1;
}
return 0;
}
int scrape_engines_parallel(ScrapeJob *jobs, int num_jobs) {
int retries = 0;
retry:
CURLM *multi_handle = curl_multi_init();
if (!multi_handle)
return -1;
for (int i = 0; i < num_jobs; i++) {
if (setup_job(&jobs[i], multi_handle) != 0 && jobs[i].handle) {
curl_multi_remove_handle(multi_handle, jobs[i].handle);
curl_easy_cleanup(jobs[i].handle);
jobs[i].handle = NULL;
}
}
http_delay();
int still_running = 0;
curl_multi_perform(multi_handle, &still_running);
@@ -512,51 +186,18 @@ retry:
do {
int numfds = 0;
CURLMcode mc = curl_multi_wait(multi_handle, NULL, 0, 1000, &numfds);
if (mc != CURLM_OK) {
if (mc != CURLM_OK)
break;
}
curl_multi_perform(multi_handle, &still_running);
} while (still_running);
CURLMsg *msg;
int msgs_left;
while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
if (msg->msg == CURLMSG_DONE) {
CURL *handle = msg->easy_handle;
for (int i = 0; i < num_jobs; i++) {
if (jobs[i].handle && jobs[i].handle == handle) {
ScrapeJob *job = &jobs[i];
process_job_response(job, handle, msg);
curl_multi_remove_handle(multi_handle, handle);
if (handle)
curl_easy_cleanup(handle);
job->handle = NULL;
break;
}
}
}
}
handle_responses(multi_handle, jobs, num_jobs);
curl_multi_cleanup(multi_handle);
if (retries < max_proxy_retries && proxy_count > 0) {
int any_failed = 0;
for (int i = 0; i < num_jobs; i++) {
if (jobs[i].results_count == 0 && jobs[i].response.size == 0) {
any_failed = 1;
break;
}
}
if (any_failed) {
if (retries < max_proxy_retries && should_retry(jobs, num_jobs)) {
retries++;
goto retry;
}
}
return 0;
}

20
src/Scraping/Scraping.h
View File

@@ -3,6 +3,7 @@
#include <curl/curl.h>
#include <libxml/HTMLparser.h>
#include <libxml/xpath.h>
typedef struct {
char *url;
@@ -45,6 +46,25 @@ typedef struct {
extern const SearchEngine ENGINE_REGISTRY[];
extern const int ENGINE_COUNT;
size_t write_memory_callback(void *contents, size_t size, size_t nmemb,
void *userp);
const char *get_random_user_agent(void);
void configure_curl_handle(CURL *curl, const char *full_url,
MemoryBuffer *chunk, struct curl_slist *headers);
char *build_search_url(const char *base_url, const char *page_param,
int page_multiplier, int page_base,
const char *encoded_query, int page);
struct curl_slist *build_request_headers(const char *host_header,
const char *referer);
void http_delay(void);
xmlXPathContextPtr create_xpath_context(xmlDocPtr doc);
void free_xpath_objects(xmlXPathContextPtr ctx, xmlXPathObjectPtr obj);
SearchResult *alloc_results_array(int capacity, int max_results);
void assign_result(SearchResult *result, char *url, char *title, char *snippet,
int unescape);
void free_xml_node_list(char *title, char *url, char *snippet);
int scrape_engine(const SearchEngine *engine, const char *query,
SearchResult **out_results, int max_results);

109
src/Scraping/ScrapingHttp.c Normal file
View File

@@ -0,0 +1,109 @@
#include "../Proxy/Proxy.h"
#include "Config.h"
#include "Scraping.h"
#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define HTTP_DELAY_MIN_US 100000
#define HTTP_DELAY_RANGE_US 100000
static const char *USER_AGENTS[] = {
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, "
"like Gecko) Chrome/120.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 "
"(KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like "
"Gecko) Chrome/120.0.0.0 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 "
"Firefox/121.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 "
"(KHTML, like Gecko) Version/17.2 Safari/605.1.15"};
#define USER_AGENT_COUNT (sizeof(USER_AGENTS) / sizeof(USER_AGENTS[0]))
size_t write_memory_callback(void *contents, size_t size, size_t nmemb,
void *userp) {
size_t realsize = size * nmemb;
MemoryBuffer *mem = (MemoryBuffer *)userp;
if (mem->size + realsize + 1 > mem->capacity) {
size_t new_cap =
mem->capacity == 0 ? INITIAL_BUFFER_SIZE : mem->capacity * 2;
while (new_cap < mem->size + realsize + 1)
new_cap *= 2;
char *ptr = (char *)realloc(mem->memory, new_cap);
if (!ptr)
return 0;
mem->memory = ptr;
mem->capacity = new_cap;
}
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
const char *get_random_user_agent(void) {
return USER_AGENTS[rand() % USER_AGENT_COUNT];
}
void configure_curl_handle(CURL *curl, const char *full_url,
MemoryBuffer *chunk, struct curl_slist *headers) {
curl_easy_setopt(curl, CURLOPT_URL, full_url);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_memory_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)chunk);
curl_easy_setopt(curl, CURLOPT_USERAGENT, get_random_user_agent());
curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
curl_easy_setopt(curl, CURLOPT_DNS_CACHE_TIMEOUT, CURL_DNS_TIMEOUT_SECS);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, CURL_TIMEOUT_SECS);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "");
apply_proxy_settings(curl);
}
char *build_search_url(const char *base_url, const char *page_param,
int page_multiplier, int page_base,
const char *encoded_query, int page) {
int page_value = (page < 1 ? 1 : page - 1) * page_multiplier + page_base;
char *url = malloc(BUFFER_SIZE_LARGE);
if (!url)
return NULL;
snprintf(url, BUFFER_SIZE_LARGE, "%s%s&%s=%d", base_url, encoded_query,
page_param, page_value);
return url;
}
struct curl_slist *build_request_headers(const char *host_header,
const char *referer) {
struct curl_slist *headers = NULL;
char host_buf[BUFFER_SIZE_MEDIUM], ref_buf[BUFFER_SIZE_MEDIUM];
snprintf(host_buf, sizeof(host_buf), "Host: %s", host_header);
snprintf(ref_buf, sizeof(ref_buf), "Referer: %s", referer);
headers = curl_slist_append(headers, host_buf);
headers = curl_slist_append(headers, ref_buf);
headers = curl_slist_append(
headers,
"Accept: "
"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
headers = curl_slist_append(headers, "Accept-Language: en-US,en;q=0.5");
headers = curl_slist_append(headers, "DNT: 1");
return headers;
}
void http_delay(void) {
usleep(HTTP_DELAY_MIN_US + (rand() % HTTP_DELAY_RANGE_US));
}

269
src/Scraping/ScrapingParsers.c Normal file
View File

@@ -0,0 +1,269 @@
#include "../Utility/Unescape.h"
#include "../Utility/XmlHelper.h"
#include "Config.h"
#include "Scraping.h"
#include <libxml/HTMLparser.h>
#include <libxml/xpath.h>
#include <stdlib.h>
#include <string.h>
xmlXPathContextPtr create_xpath_context(xmlDocPtr doc) {
return xmlXPathNewContext(doc);
}
void free_xpath_objects(xmlXPathContextPtr ctx, xmlXPathObjectPtr obj) {
if (obj)
xmlXPathFreeObject(obj);
if (ctx)
xmlXPathFreeContext(ctx);
}
SearchResult *alloc_results_array(int capacity, int max_results) {
int count = capacity < max_results ? capacity : max_results;
return xml_result_alloc(capacity, count);
}
void assign_result(SearchResult *result, char *url, char *title, char *snippet,
int unescape) {
result->url = unescape ? unescape_search_url(url) : strdup(url ? url : "");
result->title = strdup(title ? title : "No Title");
result->snippet = strdup(snippet ? snippet : "");
}
void free_xml_node_list(char *title, char *url, char *snippet) {
if (title)
xmlFree(title);
if (url)
xmlFree(url);
if (snippet)
xmlFree(snippet);
}
static int parse_ddg_lite(const char *engine_name, xmlDocPtr doc,
SearchResult **out_results, int max_results) {
(void)engine_name;
int found_count = 0;
xmlXPathContextPtr ctx = create_xpath_context(doc);
if (!ctx)
return 0;
xmlXPathObjectPtr obj =
xml_xpath_eval(ctx, "//tr[not(contains(@class, "
"'result-sponsored'))]//a[@class='result-link']");
if (!obj || !obj->nodesetval || obj->nodesetval->nodeNr == 0) {
free_xpath_objects(ctx, obj);
return 0;
}
int num_links = obj->nodesetval->nodeNr;
*out_results = alloc_results_array(num_links, max_results);
if (!*out_results) {
free_xpath_objects(ctx, obj);
return 0;
}
for (int i = 0; i < num_links && found_count < max_results; i++) {
xmlNodePtr link_node = obj->nodesetval->nodeTab[i];
char *title = xml_node_content(link_node);
char *url = (char *)xmlGetProp(link_node, (xmlChar *)"href");
char *snippet_text = NULL;
xmlNodePtr current = link_node->parent;
while (current && xmlStrcasecmp(current->name, (const xmlChar *)"tr") != 0)
current = current->parent;
if (current && current->next) {
xmlNodePtr snippet_row = current->next;
while (snippet_row &&
xmlStrcasecmp(snippet_row->name, (const xmlChar *)"tr") != 0)
snippet_row = snippet_row->next;
if (snippet_row) {
ctx->node = snippet_row;
xmlXPathObjectPtr s_obj =
xml_xpath_eval(ctx, ".//td[@class='result-snippet']");
if (s_obj && s_obj->nodesetval && s_obj->nodesetval->nodeNr > 0)
snippet_text = xml_node_content(s_obj->nodesetval->nodeTab[0]);
if (s_obj)
xmlXPathFreeObject(s_obj);
ctx->node = NULL;
}
}
assign_result(&(*out_results)[found_count], url, title, snippet_text, 1);
free_xml_node_list(title, url, snippet_text);
found_count++;
}
free_xpath_objects(ctx, obj);
return found_count;
}
static int parse_startpage(const char *engine_name, xmlDocPtr doc,
SearchResult **out_results, int max_results) {
(void)engine_name;
int found_count = 0;
xmlXPathContextPtr ctx = create_xpath_context(doc);
if (!ctx)
return 0;
xmlXPathObjectPtr obj =
xml_xpath_eval(ctx, "//div[contains(@class, 'result')]");
if (!obj || !obj->nodesetval || obj->nodesetval->nodeNr == 0) {
free_xpath_objects(ctx, obj);
return 0;
}
int num_results = obj->nodesetval->nodeNr;
*out_results = alloc_results_array(num_results, max_results);
if (!*out_results) {
free_xpath_objects(ctx, obj);
return 0;
}
for (int i = 0; i < num_results && found_count < max_results; i++) {
xmlNodePtr result_node = obj->nodesetval->nodeTab[i];
ctx->node = result_node;
xmlXPathObjectPtr link_obj =
xml_xpath_eval(ctx, ".//a[contains(@class, 'result-link')]");
char *url =
(link_obj && link_obj->nodesetval && link_obj->nodesetval->nodeNr > 0)
? (char *)xmlGetProp(link_obj->nodesetval->nodeTab[0],
(xmlChar *)"href")
: NULL;
xmlXPathObjectPtr title_obj =
xml_xpath_eval(ctx, ".//h2[contains(@class, 'wgl-title')]");
char *title = (title_obj && title_obj->nodesetval &&
title_obj->nodesetval->nodeNr > 0)
? xml_node_content(title_obj->nodesetval->nodeTab[0])
: NULL;
xmlXPathObjectPtr snippet_obj =
xml_xpath_eval(ctx, ".//p[contains(@class, 'description')]");
char *snippet_text =
(snippet_obj && snippet_obj->nodesetval &&
snippet_obj->nodesetval->nodeNr > 0)
? xml_node_content(snippet_obj->nodesetval->nodeTab[0])
: NULL;
if (url && title) {
assign_result(&(*out_results)[found_count], url, title, snippet_text, 0);
found_count++;
}
free_xml_node_list(title, url, snippet_text);
if (link_obj)
xmlXPathFreeObject(link_obj);
if (title_obj)
xmlXPathFreeObject(title_obj);
if (snippet_obj)
xmlXPathFreeObject(snippet_obj);
}
ctx->node = NULL;
free_xpath_objects(ctx, obj);
return found_count;
}
static int parse_yahoo(const char *engine_name, xmlDocPtr doc,
SearchResult **out_results, int max_results) {
(void)engine_name;
int found_count = 0;
xmlXPathContextPtr ctx = create_xpath_context(doc);
if (!ctx)
return 0;
xmlXPathObjectPtr obj =
xml_xpath_eval(ctx, "//div[contains(@class, 'algo-sr')]");
if (!obj || !obj->nodesetval || obj->nodesetval->nodeNr == 0) {
free_xpath_objects(ctx, obj);
return 0;
}
int num_results = obj->nodesetval->nodeNr;
*out_results = alloc_results_array(num_results, max_results);
if (!*out_results) {
free_xpath_objects(ctx, obj);
return 0;
}
for (int i = 0; i < num_results && found_count < max_results; i++) {
xmlNodePtr result_node = obj->nodesetval->nodeTab[i];
ctx->node = result_node;
xmlXPathObjectPtr link_obj = xml_xpath_eval(
ctx, ".//div[contains(@class, 'compTitle')]//a[@target='_blank']");
char *url =
(link_obj && link_obj->nodesetval && link_obj->nodesetval->nodeNr > 0)
? (char *)xmlGetProp(link_obj->nodesetval->nodeTab[0],
(xmlChar *)"href")
: NULL;
xmlXPathObjectPtr title_obj =
xml_xpath_eval(ctx, ".//h3[contains(@class, 'title')]");
char *title = (title_obj && title_obj->nodesetval &&
title_obj->nodesetval->nodeNr > 0)
? xml_node_content(title_obj->nodesetval->nodeTab[0])
: NULL;
xmlXPathObjectPtr snippet_obj =
xml_xpath_eval(ctx, ".//div[contains(@class, 'compText')]//p");
char *snippet_text =
(snippet_obj && snippet_obj->nodesetval &&
snippet_obj->nodesetval->nodeNr > 0)
? xml_node_content(snippet_obj->nodesetval->nodeTab[0])
: NULL;
if (url && title) {
assign_result(&(*out_results)[found_count], url, title, snippet_text, 1);
found_count++;
}
free_xml_node_list(title, url, snippet_text);
if (link_obj)
xmlXPathFreeObject(link_obj);
if (title_obj)
xmlXPathFreeObject(title_obj);
if (snippet_obj)
xmlXPathFreeObject(snippet_obj);
}
ctx->node = NULL;
free_xpath_objects(ctx, obj);
return found_count;
}
const SearchEngine ENGINE_REGISTRY[] = {
{.name = "DuckDuckGo Lite",
.base_url = "https://lite.duckduckgo.com/lite/?q=",
.host_header = "lite.duckduckgo.com",
.referer = "https://lite.duckduckgo.com/",
.page_param = "s",
.page_multiplier = 30,
.page_base = 0,
.parser = parse_ddg_lite},
{.name = "Startpage",
.base_url = "https://www.startpage.com/sp/search?q=",
.host_header = "www.startpage.com",
.referer = "https://www.startpage.com/",
.page_param = "page",
.page_multiplier = 1,
.page_base = 1,
.parser = parse_startpage},
{.name = "Yahoo",
.base_url = "https://search.yahoo.com/search?p=",
.host_header = "search.yahoo.com",
.referer = "https://search.yahoo.com/",
.page_param = "b",
.page_multiplier = 10,
.page_base = 1,
.parser = parse_yahoo}};
const int ENGINE_COUNT = sizeof(ENGINE_REGISTRY) / sizeof(SearchEngine);