http/routing.hpp - openbmc/bmcweb - Gitiles

 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: Copyright OpenBMC Authors
 #pragma once

 #include "async_resp.hpp"
 #include "dbus_privileges.hpp"
 #include "http_request.hpp"
 #include "http_response.hpp"
 #include "logging.hpp"
 #include "routing/baserule.hpp"
 #include "routing/dynamicrule.hpp"
 #include "routing/taggedrule.hpp"
 #include "routing/trie.hpp"
 #include "verb.hpp"

 #include <boost/beast/http/field.hpp>
 #include <boost/beast/http/status.hpp>

 #include <algorithm>
 #include <array>
 #include <cerrno>
 #include <cstdint>
 #include <cstdlib>
 #include <format>
 #include <functional>
 #include <memory>
 #include <optional>
 #include <stdexcept>
 #include <string>
 #include <string_view>
 #include <tuple>
 #include <utility>
 #include <vector>

 namespace crow
 {

 class Router
 {
   public:
     Router() = default;

     DynamicRule& newRuleDynamic(const std::string& rule)
     {
         std::unique_ptr<DynamicRule> ruleObject =
             std::make_unique<DynamicRule>(rule);
         DynamicRule* ptr = ruleObject.get();
         allRules.emplace_back(std::move(ruleObject));

         return *ptr;
     }

     template <uint64_t NumArgs>
     auto& newRuleTagged(const std::string& rule)
     {
         if constexpr (NumArgs == 0)
         {
             using RuleT = TaggedRule<>;
             std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
             RuleT* ptr = ruleObject.get();
             allRules.emplace_back(std::move(ruleObject));
             return *ptr;
         }
         else if constexpr (NumArgs == 1)
         {
             using RuleT = TaggedRule<std::string>;
             std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
             RuleT* ptr = ruleObject.get();
             allRules.emplace_back(std::move(ruleObject));
             return *ptr;
         }
         else if constexpr (NumArgs == 2)
         {
             using RuleT = TaggedRule<std::string, std::string>;
             std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
             RuleT* ptr = ruleObject.get();
             allRules.emplace_back(std::move(ruleObject));
             return *ptr;
         }
         else if constexpr (NumArgs == 3)
         {
             using RuleT = TaggedRule<std::string, std::string, std::string>;
             std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
             RuleT* ptr = ruleObject.get();
             allRules.emplace_back(std::move(ruleObject));
             return *ptr;
         }
         else if constexpr (NumArgs == 4)
         {
             using RuleT =
                 TaggedRule<std::string, std::string, std::string, std::string>;
             std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
             RuleT* ptr = ruleObject.get();
             allRules.emplace_back(std::move(ruleObject));
             return *ptr;
         }
         else
         {
             using RuleT = TaggedRule<std::string, std::string, std::string,
                                      std::string, std::string>;
             std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
             RuleT* ptr = ruleObject.get();
             allRules.emplace_back(std::move(ruleObject));
             return *ptr;
         }
         static_assert(NumArgs <= 5, "Max number of args supported is 5");
     }

     struct PerMethod
     {
         std::vector<BaseRule*> rules;
         Trie<crow::Node> trie;
         // rule index 0 has special meaning; preallocate it to avoid
         // duplication.
         PerMethod() : rules(1) {}

         void internalAdd(std::string_view rule, BaseRule* ruleObject)
         {
             rules.emplace_back(ruleObject);
             trie.add(rule, static_cast<unsigned>(rules.size() - 1U));
             // directory case:
             //   request to `/about' url matches `/about/' rule
             if (rule.size() > 2 && rule.back() == '/')
             {
                 trie.add(rule.substr(0, rule.size() - 1),
                          static_cast<unsigned>(rules.size() - 1));
             }
         }
     };

     void internalAddRuleObject(const std::string& rule, BaseRule* ruleObject)
     {
         if (ruleObject == nullptr)
         {
             return;
         }
         for (size_t method = 0; method <= maxVerbIndex; method++)
         {
             size_t methodBit = 1 << method;
             if ((ruleObject->methodsBitfield & methodBit) > 0U)
             {
                 perMethods[method].internalAdd(rule, ruleObject);
             }
         }

         if (ruleObject->isNotFound)
         {
             notFoundRoutes.internalAdd(rule, ruleObject);
         }

         if (ruleObject->isMethodNotAllowed)
         {
             methodNotAllowedRoutes.internalAdd(rule, ruleObject);
         }

         if (ruleObject->isUpgrade)
         {
             upgradeRoutes.internalAdd(rule, ruleObject);
         }
     }

     void validate()
     {
         for (std::unique_ptr<BaseRule>& rule : allRules)
         {
             if (rule)
             {
                 std::unique_ptr<BaseRule> upgraded = rule->upgrade();
                 if (upgraded)
                 {
                     rule = std::move(upgraded);
                 }
                 rule->validate();
                 internalAddRuleObject(rule->rule, rule.get());
             }
         }
         for (PerMethod& perMethod : perMethods)
         {
             perMethod.trie.validate();
         }
     }

     struct FindRoute
     {
         BaseRule* rule = nullptr;
         std::vector<std::string> params;
     };

     struct FindRouteResponse
     {
         std::string allowHeader;
         FindRoute route;
     };

     static FindRoute findRouteByPerMethod(std::string_view url,
                                           const PerMethod& perMethod)
     {
         FindRoute route;

         Trie<crow::Node>::FindResult found = perMethod.trie.find(url);
         if (found.ruleIndex >= perMethod.rules.size())
         {
             throw std::runtime_error("Trie internal structure corrupted!");
         }
         // Found a 404 route, switch that in
         if (found.ruleIndex != 0U)
         {
             route.rule = perMethod.rules[found.ruleIndex];
             route.params = std::move(found.params);
         }
         return route;
     }

     FindRouteResponse findRoute(const Request& req) const
     {
         FindRouteResponse findRoute;

         // Check to see if this url exists at any verb
         for (size_t perMethodIndex = 0; perMethodIndex <= maxVerbIndex;
              perMethodIndex++)
         {
             // Make sure it's safe to deference the array at that index
             static_assert(
                 maxVerbIndex < std::tuple_size_v<decltype(perMethods)>);
             FindRoute route = findRouteByPerMethod(req.url().encoded_path(),
                                                    perMethods[perMethodIndex]);
             if (route.rule == nullptr)
             {
                 continue;
             }
             if (!findRoute.allowHeader.empty())
             {
                 findRoute.allowHeader += ", ";
             }
             HttpVerb thisVerb = static_cast<HttpVerb>(perMethodIndex);
             findRoute.allowHeader += httpVerbToString(thisVerb);
         }

         std::optional<HttpVerb> verb = httpVerbFromBoost(req.method());
         if (!verb)
         {
             return findRoute;
         }
         size_t reqMethodIndex = static_cast<size_t>(*verb);
         if (reqMethodIndex >= perMethods.size())
         {
             return findRoute;
         }

         FindRoute route = findRouteByPerMethod(req.url().encoded_path(),
                                                perMethods[reqMethodIndex]);
         if (route.rule != nullptr)
         {
             findRoute.route = route;
         }

         return findRoute;
     }

     template <typename Adaptor>
     void handleUpgrade(const std::shared_ptr<Request>& req,
                        const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
                        Adaptor&& adaptor)
     {
         PerMethod& perMethod = upgradeRoutes;
         Trie<crow::Node>& trie = perMethod.trie;
         std::vector<BaseRule*>& rules = perMethod.rules;

         Trie<crow::Node>::FindResult found =
             trie.find(req->url().encoded_path());
         unsigned ruleIndex = found.ruleIndex;
         if (ruleIndex == 0U)
         {
             BMCWEB_LOG_DEBUG("Cannot match rules {}",
                              req->url().encoded_path());
             asyncResp->res.result(boost::beast::http::status::not_found);
             return;
         }

         if (ruleIndex >= rules.size())
         {
             throw std::runtime_error("Trie internal structure corrupted!");
         }

         BaseRule& rule = *rules[ruleIndex];

         BMCWEB_LOG_DEBUG("Matched rule (upgrade) '{}'", rule.rule);

         // TODO(ed) This should be able to use std::bind_front, but it doesn't
         // appear to work with the std::move on adaptor.
         validatePrivilege(
             req, asyncResp, rule,
             [req, &rule, asyncResp,
              adaptor = std::forward<Adaptor>(adaptor)]() mutable {
                 rule.handleUpgrade(*req, asyncResp, std::move(adaptor));
             });
     }

     void handle(const std::shared_ptr<Request>& req,
                 const std::shared_ptr<bmcweb::AsyncResp>& asyncResp)
     {
         FindRouteResponse foundRoute = findRoute(*req);

         if (foundRoute.route.rule == nullptr)
         {
             // Couldn't find a normal route with any verb, try looking for a 404
             // route
             if (foundRoute.allowHeader.empty())
             {
                 foundRoute.route = findRouteByPerMethod(
                     req->url().encoded_path(), notFoundRoutes);
             }
             else
             {
                 // See if we have a method not allowed (405) handler
                 foundRoute.route = findRouteByPerMethod(
                     req->url().encoded_path(), methodNotAllowedRoutes);
             }
         }

         // Fill in the allow header if it's valid
         if (!foundRoute.allowHeader.empty())
         {
             asyncResp->res.addHeader(boost::beast::http::field::allow,
                                      foundRoute.allowHeader);
         }

         // If we couldn't find a real route or a 404 route, return a generic
         // response
         if (foundRoute.route.rule == nullptr)
         {
             if (foundRoute.allowHeader.empty())
             {
                 asyncResp->res.result(boost::beast::http::status::not_found);
             }
             else
             {
                 asyncResp->res.result(
                     boost::beast::http::status::method_not_allowed);
             }
             return;
         }

         BaseRule& rule = *foundRoute.route.rule;
         std::vector<std::string> params = std::move(foundRoute.route.params);

         BMCWEB_LOG_DEBUG("Matched rule '{}' {} / {}", rule.rule,
                          req->methodString(), rule.getMethods());

         if (req->session == nullptr)
         {
             rule.handle(*req, asyncResp, params);
             return;
         }
         validatePrivilege(
             req, asyncResp, rule,
             [req, asyncResp, &rule, params = std::move(params)]() {
                 rule.handle(*req, asyncResp, params);
             });
     }

     void debugPrint()
     {
         for (size_t i = 0; i < perMethods.size(); i++)
         {
             BMCWEB_LOG_DEBUG("{}", httpVerbToString(static_cast<HttpVerb>(i)));
             perMethods[i].trie.debugPrint();
         }
     }

     std::vector<const std::string*> getRoutes(const std::string& parent)
     {
         std::vector<const std::string*> ret;

         for (const PerMethod& pm : perMethods)
         {
             std::vector<unsigned> x;
             pm.trie.findRouteIndexes(parent, x);
             for (unsigned index : x)
             {
                 ret.push_back(&pm.rules[index]->rule);
             }
         }
         return ret;
     }

   private:
     std::array<PerMethod, static_cast<size_t>(HttpVerb::Max)> perMethods;

     PerMethod notFoundRoutes;
     PerMethod upgradeRoutes;
     PerMethod methodNotAllowedRoutes;

     std::vector<std::unique_ptr<BaseRule>> allRules;
 };
 } // namespace crow
	// SPDX-License-Identifier: Apache-2.0
	// SPDX-FileCopyrightText: Copyright OpenBMC Authors
	#pragma once

	#include "async_resp.hpp"
	#include "dbus_privileges.hpp"
	#include "http_request.hpp"
	#include "http_response.hpp"
	#include "logging.hpp"
	#include "routing/baserule.hpp"
	#include "routing/dynamicrule.hpp"
	#include "routing/taggedrule.hpp"
	#include "routing/trie.hpp"
	#include "verb.hpp"

	#include <boost/beast/http/field.hpp>
	#include <boost/beast/http/status.hpp>

	#include <algorithm>
	#include <array>
	#include <cerrno>
	#include <cstdint>
	#include <cstdlib>
	#include <format>
	#include <functional>
	#include <memory>
	#include <optional>
	#include <stdexcept>
	#include <string>
	#include <string_view>
	#include <tuple>
	#include <utility>
	#include <vector>

	namespace crow
	{

	class Router
	{
	public:
	Router() = default;

	DynamicRule& newRuleDynamic(const std::string& rule)
	{
	std::unique_ptr<DynamicRule> ruleObject =
	std::make_unique<DynamicRule>(rule);
	DynamicRule* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));

	return *ptr;
	}

	template <uint64_t NumArgs>
	auto& newRuleTagged(const std::string& rule)
	{
	if constexpr (NumArgs == 0)
	{
	using RuleT = TaggedRule<>;
	std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
	RuleT* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));
	return *ptr;
	}
	else if constexpr (NumArgs == 1)
	{
	using RuleT = TaggedRule<std::string>;
	std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
	RuleT* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));
	return *ptr;
	}
	else if constexpr (NumArgs == 2)
	{
	using RuleT = TaggedRule<std::string, std::string>;
	std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
	RuleT* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));
	return *ptr;
	}
	else if constexpr (NumArgs == 3)
	{
	using RuleT = TaggedRule<std::string, std::string, std::string>;
	std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
	RuleT* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));
	return *ptr;
	}
	else if constexpr (NumArgs == 4)
	{
	using RuleT =
	TaggedRule<std::string, std::string, std::string, std::string>;
	std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
	RuleT* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));
	return *ptr;
	}
	else
	{
	using RuleT = TaggedRule<std::string, std::string, std::string,
	std::string, std::string>;
	std::unique_ptr<RuleT> ruleObject = std::make_unique<RuleT>(rule);
	RuleT* ptr = ruleObject.get();
	allRules.emplace_back(std::move(ruleObject));
	return *ptr;
	}
	static_assert(NumArgs <= 5, "Max number of args supported is 5");
	}

	struct PerMethod
	{
	std::vector<BaseRule*> rules;
	Trie<crow::Node> trie;
	// rule index 0 has special meaning; preallocate it to avoid
	// duplication.
	PerMethod() : rules(1) {}

	void internalAdd(std::string_view rule, BaseRule* ruleObject)
	{
	rules.emplace_back(ruleObject);
	trie.add(rule, static_cast<unsigned>(rules.size() - 1U));
	// directory case:
	// request to `/about' url matches `/about/' rule
	if (rule.size() > 2 && rule.back() == '/')
	{
	trie.add(rule.substr(0, rule.size() - 1),
	static_cast<unsigned>(rules.size() - 1));
	}
	}
	};

	void internalAddRuleObject(const std::string& rule, BaseRule* ruleObject)
	{
	if (ruleObject == nullptr)
	{
	return;
	}
	for (size_t method = 0; method <= maxVerbIndex; method++)
	{
	size_t methodBit = 1 << method;
	if ((ruleObject->methodsBitfield & methodBit) > 0U)
	{
	perMethods[method].internalAdd(rule, ruleObject);
	}
	}

	if (ruleObject->isNotFound)
	{
	notFoundRoutes.internalAdd(rule, ruleObject);
	}

	if (ruleObject->isMethodNotAllowed)
	{
	methodNotAllowedRoutes.internalAdd(rule, ruleObject);
	}

	if (ruleObject->isUpgrade)
	{
	upgradeRoutes.internalAdd(rule, ruleObject);
	}
	}

	void validate()
	{
	for (std::unique_ptr<BaseRule>& rule : allRules)
	{
	if (rule)
	{
	std::unique_ptr<BaseRule> upgraded = rule->upgrade();
	if (upgraded)
	{
	rule = std::move(upgraded);
	}
	rule->validate();
	internalAddRuleObject(rule->rule, rule.get());
	}
	}
	for (PerMethod& perMethod : perMethods)
	{
	perMethod.trie.validate();
	}
	}

	struct FindRoute
	{
	BaseRule* rule = nullptr;
	std::vector<std::string> params;
	};

	struct FindRouteResponse
	{
	std::string allowHeader;
	FindRoute route;
	};

	static FindRoute findRouteByPerMethod(std::string_view url,
	const PerMethod& perMethod)
	{
	FindRoute route;

	Trie<crow::Node>::FindResult found = perMethod.trie.find(url);
	if (found.ruleIndex >= perMethod.rules.size())
	{
	throw std::runtime_error("Trie internal structure corrupted!");
	}
	// Found a 404 route, switch that in
	if (found.ruleIndex != 0U)
	{
	route.rule = perMethod.rules[found.ruleIndex];
	route.params = std::move(found.params);
	}
	return route;
	}

	FindRouteResponse findRoute(const Request& req) const
	{
	FindRouteResponse findRoute;

	// Check to see if this url exists at any verb
	for (size_t perMethodIndex = 0; perMethodIndex <= maxVerbIndex;
	perMethodIndex++)
	{
	// Make sure it's safe to deference the array at that index
	static_assert(
	maxVerbIndex < std::tuple_size_v<decltype(perMethods)>);
	FindRoute route = findRouteByPerMethod(req.url().encoded_path(),
	perMethods[perMethodIndex]);
	if (route.rule == nullptr)
	{
	continue;
	}
	if (!findRoute.allowHeader.empty())
	{
	findRoute.allowHeader += ", ";
	}
	HttpVerb thisVerb = static_cast<HttpVerb>(perMethodIndex);
	findRoute.allowHeader += httpVerbToString(thisVerb);
	}

	std::optional<HttpVerb> verb = httpVerbFromBoost(req.method());
	if (!verb)
	{
	return findRoute;
	}
	size_t reqMethodIndex = static_cast<size_t>(*verb);
	if (reqMethodIndex >= perMethods.size())
	{
	return findRoute;
	}

	FindRoute route = findRouteByPerMethod(req.url().encoded_path(),
	perMethods[reqMethodIndex]);
	if (route.rule != nullptr)
	{
	findRoute.route = route;
	}

	return findRoute;
	}

	template <typename Adaptor>
	void handleUpgrade(const std::shared_ptr<Request>& req,
	const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
	Adaptor&& adaptor)
	{
	PerMethod& perMethod = upgradeRoutes;
	Trie<crow::Node>& trie = perMethod.trie;
	std::vector<BaseRule*>& rules = perMethod.rules;

	Trie<crow::Node>::FindResult found =
	trie.find(req->url().encoded_path());
	unsigned ruleIndex = found.ruleIndex;
	if (ruleIndex == 0U)
	{
	BMCWEB_LOG_DEBUG("Cannot match rules {}",
	req->url().encoded_path());
	asyncResp->res.result(boost::beast::http::status::not_found);
	return;
	}

	if (ruleIndex >= rules.size())
	{
	throw std::runtime_error("Trie internal structure corrupted!");
	}

	BaseRule& rule = *rules[ruleIndex];

	BMCWEB_LOG_DEBUG("Matched rule (upgrade) '{}'", rule.rule);

	// TODO(ed) This should be able to use std::bind_front, but it doesn't
	// appear to work with the std::move on adaptor.
	validatePrivilege(
	req, asyncResp, rule,
	[req, &rule, asyncResp,
	adaptor = std::forward<Adaptor>(adaptor)]() mutable {
	rule.handleUpgrade(*req, asyncResp, std::move(adaptor));
	});
	}

	void handle(const std::shared_ptr<Request>& req,
	const std::shared_ptr<bmcweb::AsyncResp>& asyncResp)
	{
	FindRouteResponse foundRoute = findRoute(*req);

	if (foundRoute.route.rule == nullptr)
	{
	// Couldn't find a normal route with any verb, try looking for a 404
	// route
	if (foundRoute.allowHeader.empty())
	{
	foundRoute.route = findRouteByPerMethod(
	req->url().encoded_path(), notFoundRoutes);
	}
	else
	{
	// See if we have a method not allowed (405) handler
	foundRoute.route = findRouteByPerMethod(
	req->url().encoded_path(), methodNotAllowedRoutes);
	}
	}

	// Fill in the allow header if it's valid
	if (!foundRoute.allowHeader.empty())
	{
	asyncResp->res.addHeader(boost::beast::http::field::allow,
	foundRoute.allowHeader);
	}

	// If we couldn't find a real route or a 404 route, return a generic
	// response
	if (foundRoute.route.rule == nullptr)
	{
	if (foundRoute.allowHeader.empty())
	{
	asyncResp->res.result(boost::beast::http::status::not_found);
	}
	else
	{
	asyncResp->res.result(
	boost::beast::http::status::method_not_allowed);
	}
	return;
	}

	BaseRule& rule = *foundRoute.route.rule;
	std::vector<std::string> params = std::move(foundRoute.route.params);

	BMCWEB_LOG_DEBUG("Matched rule '{}' {} / {}", rule.rule,
	req->methodString(), rule.getMethods());

	if (req->session == nullptr)
	{
	rule.handle(*req, asyncResp, params);
	return;
	}
	validatePrivilege(
	req, asyncResp, rule,
	[req, asyncResp, &rule, params = std::move(params)]() {
	rule.handle(*req, asyncResp, params);
	});
	}

	void debugPrint()
	{
	for (size_t i = 0; i < perMethods.size(); i++)
	{
	BMCWEB_LOG_DEBUG("{}", httpVerbToString(static_cast<HttpVerb>(i)));
	perMethods[i].trie.debugPrint();
	}
	}

	std::vector<const std::string*> getRoutes(const std::string& parent)
	{
	std::vector<const std::string*> ret;

	for (const PerMethod& pm : perMethods)
	{
	std::vector<unsigned> x;
	pm.trie.findRouteIndexes(parent, x);
	for (unsigned index : x)
	{
	ret.push_back(&pm.rules[index]->rule);
	}
	}
	return ret;
	}

	private:
	std::array<PerMethod, static_cast<size_t>(HttpVerb::Max)> perMethods;

	PerMethod notFoundRoutes;
	PerMethod upgradeRoutes;
	PerMethod methodNotAllowedRoutes;

	std::vector<std::unique_ptr<BaseRule>> allRules;
	};
	} // namespace crow