Function rest_headers

src/rest.cpp:187–275

}

static bool rest_headers(const std::any& context,
                         HTTPRequest* req,
                         const std::string& strURIPart)
{
    if (!CheckWarmup(req))
        return false;
    std::string param;
    const RetFormat rf = ParseDataFormat(param, strURIPart);
    std::vector<std::string> path;
    boost::split(path, param, boost::is_any_of("/"));

    if (path.size() != 2)
        return RESTERR(req, HTTP_BAD_REQUEST, "No header count specified. Use /rest/headers/<count>/<hash>.<ext>.");

    const auto parsed_count{ToIntegral<size_t>(path[0])};
    if (!parsed_count.has_value() || *parsed_count < 1 || *parsed_count > MAX_REST_HEADERS_RESULTS) {
        return RESTERR(req, HTTP_BAD_REQUEST, strprintf("Header count is invalid or out of acceptable range (1-%u): %s", MAX_REST_HEADERS_RESULTS, path[0]));
    }

    std::string hashStr = path[1];
    uint256 hash;
    if (!ParseHashStr(hashStr, hash))
        return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);

    const CBlockIndex* tip = nullptr;
    std::vector<const CBlockIndex*> headers;
    headers.reserve(*parsed_count);
    {
        ChainstateManager* maybe_chainman = GetChainman(context, req);
        if (!maybe_chainman) return false;
        ChainstateManager& chainman = *maybe_chainman;
        LOCK(cs_main);
        CChain& active_chain = chainman.ActiveChain();
        tip = active_chain.Tip();
        const CBlockIndex* pindex = chainman.m_blockman.LookupBlockIndex(hash);
        while (pindex != nullptr && active_chain.Contains(pindex)) {
            headers.push_back(pindex);
            if (headers.size() == *parsed_count) {
                break;
            }
            pindex = active_chain.Next(pindex);
        }
    }

    switch (rf) {
    case RetFormat::BINARY: {
        CDataStream ssHeader(SER_NETWORK, PROTOCOL_VERSION);
        for (const CBlockIndex *pindex : headers) {
            LOCK(cs_main);
            CBlockIndex tmpBlockIndexFull;
            const CBlockIndex* pindexfull=pindex->untrim_to(&tmpBlockIndexFull);
            ssHeader << pindexfull->GetBlockHeader();
        }

        std::string binaryHeader = ssHeader.str();
        req->WriteHeader("Content-Type", "application/octet-stream");
        req->WriteReply(HTTP_OK, binaryHeader);
        return true;