battleNetApi/include/hearthstoneTokenBuilder.hpp


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#include <chrono>
#include <cstdint>
#include <nlohmann/json.hpp>
#include <string>
#include <token.hpp>
#include <tokenBuilder.hpp>
#include <vector>

using nlohmann::json;

static constexpr std::uint64_t kTOKEN_CONTENT_MIN_LENGTH{10};

class HearthstoneTokenBuilder : TokenBuilder {
  private:
    std::shared_ptr<Token> mCurrentToken;
    bool mUpdateSourceFile{false};
    std::vector<std::string> _credentialJsonPaths;
    [[nodiscard]]
    bool isUpdateSourceFileAllowed() const;
    [[nodiscard]]
    const bool hasExpired(json iTokenJson) const;
    static size_t curlCallbackStringOutput(void *iPtr, size_t iSize, size_t iNmemb,
                                           std::string *iUserData);
    [[nodiscard]]
    std::chrono::seconds getCurrentTime() const;
    [[nodiscard]]
    std::pair<std::string, std::uint64_t>
    getTokenWithApi(const std::string &iAgentJsonFilePath) const;
    [[nodiscard]]
    std::string getTokenFromLocalFile() const;
    void writeTokenToLocalFile(const std::pair<std::string, std::uint64_t> &iToken) const;

  public:
    HearthstoneTokenBuilder(const std::span<std::string> &iJsonPaths);
    template <typename... CredentialJsonPaths>
    HearthstoneTokenBuilder(CredentialJsonPaths... iCredentialJsonPaths) {
        (_credentialJsonPaths.push_back(iCredentialJsonPaths), ...);
    }
    template <typename... CredentialJsonPaths>
    HearthstoneTokenBuilder &addCredentialJsonFiles(CredentialJsonPaths... iCredentialJsonPaths) {
        (_credentialJsonPaths.push_back(iCredentialJsonPaths), ...);
    }
    HearthstoneTokenBuilder &allowUpdateSourceFile();
    /**
     * @return Create an access token to perform API requests.
     * First, the cache files are checked. (Which ones?)
     * A new token is computed if the token lifetimes expired,
     * or if there is no token at all.
     */
    HearthstoneTokenBuilder &buildToken() override;
    [[nodiscard]]
    std::shared_ptr<Token> getToken() override;
};