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216 lines
4.8 KiB
216 lines
4.8 KiB
/*
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Part of the API MODULE
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Copyright (C) 2020 by Maxim Prokhorov <prokhorov dot max at outlook dot com>
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*/
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#pragma once
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#include <Arduino.h>
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#include <ESPAsyncWebServer.h>
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#include <algorithm>
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#include <memory>
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#include <vector>
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// -----------------------------------------------------------------------------
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struct PathPart {
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enum class Type {
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Unknown,
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Value,
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SingleWildcard,
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MultiWildcard
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};
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Type type;
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size_t offset;
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size_t length;
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};
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struct PathParts {
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using Parts = std::vector<PathPart>;
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PathParts() = delete;
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PathParts(const PathParts&) = default;
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PathParts(PathParts&&) noexcept = default;
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explicit PathParts(const String& path);
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explicit operator bool() const {
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return _ok;
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}
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void clear() {
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_parts.clear();
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}
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void reserve(size_t size) {
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_parts.reserve(size);
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}
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String operator[](size_t index) const {
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auto& part = _parts[index];
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return _path.substring(part.offset, part.offset + part.length);
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}
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const String& path() const {
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return _path;
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}
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const Parts& parts() const {
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return _parts;
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}
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size_t size() const {
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return _parts.size();
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}
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Parts::const_iterator begin() const {
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return _parts.begin();
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}
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Parts::const_iterator end() const {
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return _parts.end();
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}
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bool match(const PathParts& path) const;
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bool match(const String& path) const {
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return match(PathParts(path));
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}
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private:
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PathPart& emplace_back(PathPart::Type type, size_t offset, size_t length) {
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PathPart part { type, offset, length };
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_parts.push_back(std::move(part));
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return _parts.back();
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}
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const String& _path;
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Parts _parts;
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bool _ok { false };
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};
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// this is a purely temporary object, which we can only create while doing the API dispatch
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struct ApiRequest {
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ApiRequest() = delete;
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ApiRequest(const ApiRequest&) = default;
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ApiRequest(ApiRequest&&) noexcept = default;
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explicit ApiRequest(AsyncWebServerRequest& request, const PathParts& pattern, const PathParts& parts) :
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_request(request),
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_pattern(pattern),
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_parts(parts)
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{}
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template <typename T>
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void handle(T&& handler) {
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if (_done) return;
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_done = true;
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handler(&_request);
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}
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template <typename T>
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void param_foreach(T&& handler) {
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const size_t params { _request.params() };
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for (size_t current = 0; current < params; ++current) {
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auto* param = _request.getParam(current);
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handler(param->name(), param->value());
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}
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}
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template <typename T>
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void param_foreach(const String& name, T&& handler) {
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param_foreach([&](const String& param_name, const String& param_value) {
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if (param_name == name) {
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handler(param_value);
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}
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});
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}
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const String& param(const String& name) {
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auto* result = _request.getParam(name, HTTP_PUT == _request.method());
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if (result) {
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return result->value();
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}
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return _empty_string();
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}
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void send(const String& payload) {
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if (_done) return;
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_done = true;
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if (payload.length()) {
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_request.send(200, "text/plain", payload);
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} else {
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_request.send(204);
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}
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}
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bool done() const {
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return _done;
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}
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const PathParts& parts() const {
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return _parts;
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}
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String part(size_t index) const {
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return _parts[index];
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}
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// Only works when pattern cointains '+', retrieving the part at the same index from the real path
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// e.g. for the pair of `some/+/path` and `some/data/path`, calling `wildcard(0)` will return `data`
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String wildcard(int index) const;
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size_t wildcards() const;
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private:
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const String& _empty_string() const {
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static const String string;
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return string;
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}
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bool _done { false };
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AsyncWebServerRequest& _request;
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const PathParts& _pattern;
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const PathParts& _parts;
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};
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struct ApiRequestHelper {
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ApiRequestHelper(const ApiRequestHelper&) = delete;
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ApiRequestHelper(ApiRequestHelper&&) noexcept = default;
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// &path is expected to be request->url(), which is valid throughout the request's lifetime
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explicit ApiRequestHelper(AsyncWebServerRequest& request, const PathParts& pattern) :
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_request(request),
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_pattern(pattern),
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_path(request.url()),
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_match(_pattern.match(_path))
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{}
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ApiRequest request() const {
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return ApiRequest(_request, _pattern, _path);
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}
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const PathParts& parts() const {
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return _path;
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}
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bool match() const {
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return _match;
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}
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private:
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AsyncWebServerRequest& _request;
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const PathParts& _pattern;
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PathParts _path;
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bool _match;
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};
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