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#include "../include/GoogleCaptcha.hpp"
#include "../include/StringUtils.hpp"
#include "../include/DownloadUtils.hpp"
namespace QuickMedia {
static bool google_captcha_response_extract_id(const std::string& html, std::string& result)
{
size_t value_index = html.find("value=\"");
if(value_index == std::string::npos)
return false;
size_t value_begin = value_index + 7;
size_t value_end = html.find('"', value_begin);
if(value_end == std::string::npos)
return false;
size_t value_length = value_end - value_begin;
// The id is also only valid if it's in base64, but it might be overkill to verify if it's base64 here
if(value_length < 300)
return false;
result = html.substr(value_begin, value_length);
return true;
}
static bool google_captcha_response_extract_goal_description(const std::string& html, std::string& result)
{
size_t goal_description_begin = html.find("rc-imageselect-desc-no-canonical");
if(goal_description_begin == std::string::npos) {
goal_description_begin = html.find("rc-imageselect-desc");
if(goal_description_begin == std::string::npos)
return false;
}
goal_description_begin = html.find('>', goal_description_begin);
if(goal_description_begin == std::string::npos)
return false;
goal_description_begin += 1;
size_t goal_description_end = html.find("</div", goal_description_begin);
if(goal_description_end == std::string::npos)
return false;
// The goal description with google captcha right now is "Select all images with <strong>subject</strong>".
// TODO: Should the subject be extracted, so bold styling can be applied to it?
result = html.substr(goal_description_begin, goal_description_end - goal_description_begin);
string_replace_all(result, "<strong>", "");
string_replace_all(result, "</strong>", "");
return true;
}
static std::optional<GoogleCaptchaChallengeInfo> google_captcha_parse_request_challenge_response(const std::string& api_key, const std::string& html_source)
{
GoogleCaptchaChallengeInfo result;
if(!google_captcha_response_extract_id(html_source, result.id))
return std::nullopt;
result.payload_url = "https://www.google.com/recaptcha/api2/payload?c=" + result.id + "&k=" + api_key;
if(!google_captcha_response_extract_goal_description(html_source, result.description))
return std::nullopt;
return result;
}
// Note: This assumes strings (quoted data) in html tags dont contain '<' or '>'
static std::string strip_html_tags(const std::string& text)
{
std::string result;
size_t index = 0;
while(true)
{
size_t tag_start_index = text.find('<', index);
if(tag_start_index == std::string::npos)
{
result.append(text.begin() + index, text.end());
break;
}
result.append(text.begin() + index, text.begin() + tag_start_index);
size_t tag_end_index = text.find('>', tag_start_index + 1);
if(tag_end_index == std::string::npos)
break;
index = tag_end_index + 1;
}
return result;
}
static std::optional<std::string> google_captcha_parse_submit_solution_response(const std::string& html_source)
{
size_t start_index = html_source.find("\"fbc-verification-token\">");
if(start_index == std::string::npos)
return std::nullopt;
start_index += 25;
size_t end_index = html_source.find("</", start_index);
if(end_index == std::string::npos)
return std::nullopt;
return strip_html_tags(html_source.substr(start_index, end_index - start_index));
}
std::future<bool> google_captcha_request_challenge(const std::string &api_key, const std::string &referer, RequestChallengeResponse challenge_response_callback) {
return std::async(std::launch::async, [challenge_response_callback, api_key, referer]() {
std::string captcha_url = "https://www.google.com/recaptcha/api/fallback?k=" + api_key;
std::string response;
std::vector<CommandArg> additional_args = {
CommandArg{"-H", "Referer: " + referer}
};
DownloadResult download_result = download_to_string(captcha_url, response, additional_args);
if(download_result == DownloadResult::OK) {
//fprintf(stderr, "Failed to get captcha, response: %s\n", response.c_str());
challenge_response_callback(google_captcha_parse_request_challenge_response(api_key, response));
return true;
} else {
fprintf(stderr, "Failed to get captcha, response: %s\n", response.c_str());
challenge_response_callback(std::nullopt);
return false;
}
});
}
static std::string build_post_solution_response(std::array<bool, 9> selected_images) {
std::string result;
for(size_t i = 0; i < selected_images.size(); ++i) {
if(selected_images[i]) {
if(!result.empty())
result += "&";
result += "response=" + std::to_string(i);
}
}
return result;
}
std::future<bool> google_captcha_post_solution(const std::string &api_key, const std::string &captcha_id, std::array<bool, 9> selected_images, PostSolutionResponse solution_response_callback) {
return std::async(std::launch::async, [solution_response_callback, api_key, captcha_id, selected_images]() {
std::string captcha_url = "https://www.google.com/recaptcha/api/fallback?k=" + api_key;
std::string response;
std::vector<CommandArg> additional_args = {
CommandArg{"-H", "Referer: " + captcha_url},
CommandArg{"--data", "c=" + captcha_id + "&" + build_post_solution_response(selected_images)}
};
DownloadResult post_result = download_to_string(captcha_url, response, additional_args);
if(post_result == DownloadResult::OK) {
//fprintf(stderr, "Failed to post captcha solution, response: %s\n", response.c_str());
std::optional<std::string> captcha_post_id = google_captcha_parse_submit_solution_response(response);
if(captcha_post_id) {
solution_response_callback(std::move(captcha_post_id), std::nullopt);
} else {
std::optional<GoogleCaptchaChallengeInfo> challenge_info = google_captcha_parse_request_challenge_response(api_key, response);
solution_response_callback(std::nullopt, std::move(challenge_info));
}
return true;
} else {
fprintf(stderr, "Failed to post captcha solution, response: %s\n", response.c_str());
solution_response_callback(std::nullopt, std::nullopt);
return false;
}
});
}
}
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