retoor
3c4334cec9
Full C++23 framework tree: runtime, observability, security, data, app, realtime, supervisor, clients, CLI, example plus enterprise tenancy, audit, operability, governance, supplychain. Postgres via docker compose for tests.
71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
#include "Negotiate.hpp"
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#include <cctype>
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namespace molo::example::fw {
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namespace {
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std::string trim(std::string s) {
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while (!s.empty() && (s.front() == ' ' || s.front() == '\t')) s.erase(s.begin());
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while (!s.empty() && (s.back() == ' ' || s.back() == '\t')) s.pop_back();
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return s;
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}
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} // namespace
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std::string negotiate(const std::string& accept,
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const std::vector<std::string>& available) {
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if (available.empty()) throw HttpError(500, "no_offers", "no offers");
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if (accept.empty()) return available.front();
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struct Range {
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std::string type;
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double q = 1.0;
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};
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std::vector<Range> ranges;
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std::size_t start = 0;
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while (start < accept.size()) {
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std::size_t comma = accept.find(',', start);
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if (comma == std::string::npos) comma = accept.size();
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std::string part = trim(accept.substr(start, comma - start));
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std::size_t semi = part.find(';');
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Range r{trim(part.substr(0, semi)), 1.0};
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if (semi != std::string::npos) {
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std::string params = part.substr(semi + 1);
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std::size_t q = params.find("q=");
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if (q != std::string::npos) {
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try {
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r.q = std::stod(params.substr(q + 2));
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} catch (...) {
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r.q = 1.0;
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}
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}
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}
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ranges.push_back(r);
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start = comma + 1;
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}
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std::string best;
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double best_q = -1.0;
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for (const auto& a : available) {
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for (const auto& r : ranges) {
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bool hit = r.type == "*/*" || r.type == a;
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if (!hit) {
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std::size_t slash = a.find('/');
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std::string wild = slash == std::string::npos
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? "*/*"
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: a.substr(0, slash) + "/*";
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hit = r.type == wild;
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}
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if (hit && r.q > best_q) {
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best_q = r.q;
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best = a;
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}
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}
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}
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if (best.empty() || best_q <= 0.0)
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throw HttpError(406, "not_acceptable", "no acceptable format");
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return best;
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}
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} // namespace molo::example::fw
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