errors.hpp

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// §2 Error taxonomy — exactly three top-level error types, exposed as an
// exception hierarchy rooted at AxiamError.
#pragma once
 
#include <optional>
#include <stdexcept>
#include <string>
 
namespace axiam {
 
class AxiamError : public std::runtime_error {
public:
    explicit AxiamError(const std::string& message) : std::runtime_error(message) {}
};
 
class AuthError : public AxiamError {
public:
    explicit AuthError(const std::string& message) : AxiamError(message) {}
};
 
class AuthzError : public AxiamError {
public:
    explicit AuthzError(const std::string& message) : AxiamError(message) {}
 
    AuthzError(const std::string& message, std::optional<std::string> action,
               std::optional<std::string> resource_id)
        : AxiamError(message),
          action_(std::move(action)),
          resource_id_(std::move(resource_id)) {}
 
    const std::optional<std::string>& action() const noexcept { return action_; }
    const std::optional<std::string>& resource_id() const noexcept { return resource_id_; }
 
private:
    std::optional<std::string> action_;
    std::optional<std::string> resource_id_;
};
 
class NetworkError : public AxiamError {
public:
    explicit NetworkError(const std::string& message)
        : AxiamError(message), cause_(message) {}
 
    NetworkError(const std::string& message, std::string cause)
        : AxiamError(message), cause_(std::move(cause)) {}
 
    const std::string& cause() const noexcept { return cause_; }
 
private:
    std::string cause_;
};
 
}  // namespace axiam