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699 lines
18 KiB
699 lines
18 KiB
/*
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API & WEB API MODULE
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Copyright (C) 2016-2019 by Xose Pérez <xose dot perez at gmail dot com>
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Copyright (C) 2020-2021 by Maxim Prokhorov <prokhorov dot max at outlook dot com>
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*/
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#include "api.h"
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// -----------------------------------------------------------------------------
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#include "system.h"
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#include "rpc.h"
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#if WEB_SUPPORT
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#include "web.h"
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#include <ESPAsyncTCP.h>
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#include <ArduinoJson.h>
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#endif
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#include <algorithm>
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#include <memory>
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#include <cstring>
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#include <forward_list>
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#include <vector>
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// -----------------------------------------------------------------------------
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PathParts::PathParts(espurna::StringView path) :
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_path(path)
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{
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if (!_path.length()) {
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_ok = false;
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return;
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}
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PathPart::Type type { PathPart::Type::Unknown };
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size_t length { 0ul };
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size_t offset { 0ul };
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const char* p { _path.begin() };
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if (*p == '\0') {
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goto error;
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}
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_parts.reserve(std::count(_path.begin(), _path.end(), '/') + 1);
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start:
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type = PathPart::Type::Unknown;
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length = 0;
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offset = p - _path.c_str();
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switch (*p) {
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case '+':
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goto parse_single_wildcard;
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case '#':
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goto parse_multi_wildcard;
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case '/':
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default:
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goto parse_value;
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}
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parse_value:
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type = PathPart::Type::Value;
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switch (*p) {
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case '+':
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case '#':
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goto error;
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case '/':
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case '\0':
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goto push_result;
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}
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++p;
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++length;
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goto parse_value;
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parse_single_wildcard:
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type = PathPart::Type::SingleWildcard;
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++p;
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switch (*p) {
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case '/':
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++p;
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case '\0':
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goto push_result;
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}
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goto error;
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parse_multi_wildcard:
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type = PathPart::Type::MultiWildcard;
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++p;
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if (*p == '\0') {
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goto push_result;
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}
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goto error;
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push_result:
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emplace_back(type, offset, length);
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if (*p == '/') {
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++p;
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goto start;
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} else if (*p != '\0') {
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goto start;
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}
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goto success;
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error:
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_ok = false;
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_parts.clear();
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return;
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success:
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_ok = true;
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}
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// match when, for example, given the path 'topic/one/two/three' and pattern 'topic/+/two/+'
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bool PathParts::match(const PathParts& path) const {
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if (!_ok || !path) {
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return false;
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}
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auto lhs = begin();
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auto lhs_end = end();
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auto rhs = path.begin();
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auto rhs_end = path.end();
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loop:
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if (lhs == lhs_end) {
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goto check_end;
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}
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switch ((*lhs).type) {
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case PathPart::Type::Value:
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if (
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(rhs != rhs_end)
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&& ((*rhs).type == PathPart::Type::Value)
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&& ((*rhs).length == (*lhs).length)
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) {
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if (0 == std::memcmp(
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_path.c_str() + (*lhs).offset,
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path.path().c_str() + (*rhs).offset,
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(*rhs).length))
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{
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std::advance(lhs, 1);
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std::advance(rhs, 1);
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goto loop;
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}
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}
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goto error;
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case PathPart::Type::SingleWildcard:
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if (
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(rhs != rhs_end)
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&& ((*rhs).type == PathPart::Type::Value)
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) {
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std::advance(lhs, 1);
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std::advance(rhs, 1);
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goto loop;
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}
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goto error;
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case PathPart::Type::MultiWildcard:
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if (std::next(lhs) == lhs_end) {
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while (rhs != rhs_end) {
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if ((*rhs).type != PathPart::Type::Value) {
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goto error;
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}
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std::advance(rhs, 1);
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}
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lhs = lhs_end;
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break;
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}
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goto error;
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case PathPart::Type::Unknown:
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goto error;
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};
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check_end:
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if ((lhs == lhs_end) && (rhs == rhs_end)) {
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return true;
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}
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error:
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return false;
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}
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espurna::StringView PathParts::wildcard(const PathParts& pattern, const PathParts& value, int index) {
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if (index < 0) {
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index = std::abs(index + 1);
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}
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espurna::StringView out;
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if (std::abs(index) < pattern.parts().size()) {
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const auto& pattern_parts = pattern.parts();
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int counter { 0 };
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for (size_t part = 0; part < pattern.size(); ++part) {
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const auto& lhs = pattern_parts[part];
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const auto& rhs = value.parts()[part];
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const auto path = value.path();
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switch (lhs.type) {
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case PathPart::Type::Value:
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case PathPart::Type::Unknown:
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break;
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case PathPart::Type::SingleWildcard:
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if (counter == index) {
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out = espurna::StringView(
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path.begin() + rhs.offset, path.begin() + rhs.offset + rhs.length);
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return out;
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}
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++counter;
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break;
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case PathPart::Type::MultiWildcard:
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if (counter == index) {
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out = espurna::StringView(
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path.begin() + rhs.offset, path.end());
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}
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return out;
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}
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}
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}
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return out;
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}
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size_t PathParts::wildcards(const PathParts& pattern) {
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size_t out { 0 };
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for (const auto& part : pattern) {
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switch (part.type) {
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case PathPart::Type::Unknown:
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case PathPart::Type::Value:
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case PathPart::Type::MultiWildcard:
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break;
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case PathPart::Type::SingleWildcard:
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++out;
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break;
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}
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}
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return out;
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}
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#if WEB_SUPPORT
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String ApiRequest::wildcard(int index) const {
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return PathParts::wildcard(_pattern, _parts, index).toString();
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}
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size_t ApiRequest::wildcards() const {
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return PathParts::wildcards(_pattern);
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}
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#endif
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// -----------------------------------------------------------------------------
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#if API_SUPPORT
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namespace {
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bool _apiAccepts(AsyncWebServerRequest* request, const __FlashStringHelper* str) {
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auto* header = request->getHeader(F("Accept"));
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if (!header) {
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return true;
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}
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return (header->value().indexOf(F("*/*")) >= 0)
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|| (header->value().indexOf(str) >= 0);
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}
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bool _apiAcceptsText(AsyncWebServerRequest* request) {
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return _apiAccepts(request, F("text/plain"));
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}
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bool _apiAcceptsJson(AsyncWebServerRequest* request) {
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return _apiAccepts(request, F("application/json"));
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}
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bool _apiIsContentType(AsyncWebServerRequest* request, const char* value) {
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const auto& type = request->contentType();
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return strncmp_P(type.c_str(), value, type.length()) == 0;
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}
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bool _apiIsFormDataContent(AsyncWebServerRequest* request) {
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return _apiIsContentType(request, PSTR("application/x-www-form-urlencoded"));
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}
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bool _apiIsJsonContent(AsyncWebServerRequest* request) {
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return _apiIsContentType(request, PSTR("application/json"));
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}
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// Because the webserver request is split between multiple separate function invocations, we need to preserve some state.
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// TODO: in case we are dealing with multicore, perhaps enforcing static-size data structs instead of the vector would we better,
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// to avoid calling generic malloc when paths are parsed?
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//
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// Some quirks to deal with:
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// - handleBody is called before handleRequest, and there's no way to signal completion / success of both callbacks to the server
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// - Server never checks for request closing in filter or canHandle, so if we don't want to handle large content-length, it
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// will still flow through the lwip backend.
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// - `request->_tempObject` is used to keep API request state, but it's just a plain void pointer
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// - `request->send(..., payload)` creates a heap-allocated `reponse` object that will copy the payload and tracks it by a basic pointer.
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// In case we call `request->send` a 2nd time (regardless of the type of the send()), it creates a 2nd object without de-allocating the 1st one.
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// - espasyncwebserver will `free(_tempObject)` when request is disconnected, but only after this callbackhandler is done.
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// make sure it's set to nullptr via `AsyncWebServerRequest::onDisconnect`
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// - ALL headers are parsed (and we could access those during filter and canHandle callbacks), but we need to explicitly
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// request them to stay in memory so that the actual handler can work with them
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void _apiAttachHelper(AsyncWebServerRequest& request, ApiRequestHelper&& helper) {
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request._tempObject = new ApiRequestHelper(std::move(helper));
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request.onDisconnect([&]() {
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auto* ptr = reinterpret_cast<ApiRequestHelper*>(request._tempObject);
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delete ptr;
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request._tempObject = nullptr;
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});
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request.addInterestingHeader(F("Api-Key"));
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request.addInterestingHeader(F("Accept"));
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}
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class ApiBaseWebHandler : public AsyncWebHandler {
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public:
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ApiBaseWebHandler() = delete;
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ApiBaseWebHandler(const ApiBaseWebHandler&) = delete;
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ApiBaseWebHandler(ApiBaseWebHandler&&) = delete;
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// In case this needs to be copied or moved, ensure PathParts copy references the new object's string
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template <typename Pattern>
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explicit ApiBaseWebHandler(Pattern&& pattern) :
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_pattern(std::forward<Pattern>(pattern)),
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_parts(_pattern)
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{}
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const String& pattern() const {
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return _pattern;
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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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private:
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String _pattern;
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PathParts _parts;
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};
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// 'Modernized' API configuration:
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// - `Api-Key` header for both GET and PUT
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// - Parse request body as JSON object. Limited to LWIP internal buffer size, and will also break when client
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// does weird stuff and PUTs data in multiple packets b/c only the initial packet is parsed.
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// - Same as the text/plain, when ApiRequest::handle was not called it will then call GET
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//
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// TODO: bump to arduinojson v6 to handle partial / broken data payloads
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// TODO: somehow detect partial data and buffer (optionally)
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// TODO: POST instead of PUT?
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class ApiJsonWebHandler final : public ApiBaseWebHandler {
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public:
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static constexpr size_t BufferSize { API_JSON_BUFFER_SIZE };
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ApiJsonWebHandler() = delete;
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ApiJsonWebHandler(const ApiJsonWebHandler&) = delete;
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ApiJsonWebHandler(ApiJsonWebHandler&&) = delete;
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template <typename Path, typename Callback>
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ApiJsonWebHandler(Path&& path, Callback&& get, Callback&& put) :
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ApiBaseWebHandler(std::forward<Path>(path)),
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_get(std::forward<Callback>(get)),
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_put(std::forward<Callback>(put))
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{}
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bool isRequestHandlerTrivial() override {
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return true;
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}
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bool canHandle(AsyncWebServerRequest* request) override {
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if (!apiEnabled()) {
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return false;
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}
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auto helper = ApiRequestHelper(*request, parts());
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if (helper.match() && apiAuthenticate(request)) {
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switch (request->method()) {
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case HTTP_HEAD:
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return true;
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case HTTP_PUT:
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if (!_apiIsJsonContent(request)) {
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return false;
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}
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if (!_put) {
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return false;
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}
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// fallthrough!
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case HTTP_GET:
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if (!_get) {
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return false;
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}
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break;
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default:
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return false;
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}
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_apiAttachHelper(*request, std::move(helper));
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return true;
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}
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return false;
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}
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void _handleGet(AsyncWebServerRequest* request, ApiRequest& apireq) {
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DynamicJsonBuffer jsonBuffer(BufferSize);
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JsonObject& root = jsonBuffer.createObject();
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if (!_get(apireq, root)) {
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request->send(500);
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return;
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}
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if (!apireq.done()) {
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AsyncResponseStream *response = request->beginResponseStream("application/json", root.measureLength() + 1);
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root.printTo(*response);
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request->send(response);
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return;
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}
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request->send(500);
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}
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void _handlePut(AsyncWebServerRequest* request, uint8_t* data, size_t size) {
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// XXX: arduinojson v5 de-serializer will happily read garbage from raw ptr, since there's no length limit
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// this is fixed in v6 though. for now, use a wrapper, but be aware that this actually uses more mem for the jsonbuffer
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auto reader = espurna::StringView(
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reinterpret_cast<const char*>(data),
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reinterpret_cast<const char*>(data + size));
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DynamicJsonBuffer jsonBuffer(BufferSize);
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JsonObject& root = jsonBuffer.parseObject(reader);
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if (!root.success()) {
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request->send(500);
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return;
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}
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auto& helper = *reinterpret_cast<ApiRequestHelper*>(request->_tempObject);
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auto apireq = helper.request();
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if (!_put(apireq, root)) {
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request->send(500);
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return;
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}
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if (!apireq.done()) {
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_handleGet(request, apireq);
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}
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return;
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}
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void handleBody(AsyncWebServerRequest* request, uint8_t* data, size_t len, size_t, size_t total) override {
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if (total && (len == total)) {
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_handlePut(request, data, total);
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}
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}
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void handleRequest(AsyncWebServerRequest* request) override {
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if (!_apiAcceptsJson(request)) {
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request->send(406, F("text/plain"), F("application/json"));
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return;
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}
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auto& helper = *reinterpret_cast<ApiRequestHelper*>(request->_tempObject);
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switch (request->method()) {
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case HTTP_HEAD:
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request->send(204);
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return;
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case HTTP_GET: {
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auto apireq = helper.request();
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_handleGet(request, apireq);
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return;
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}
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// see handleBody()
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case HTTP_PUT:
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break;
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default:
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request->send(405);
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break;
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}
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}
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const String& pattern() const {
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return ApiBaseWebHandler::pattern();
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}
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const PathParts& parts() const {
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return ApiBaseWebHandler::parts();
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}
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private:
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ApiJsonHandler _get;
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ApiJsonHandler _put;
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};
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// ESPurna legacy API configuration
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// - ?apikey=... to authorize in GET or PUT
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// - ?anything=... for input data (common key is "value")
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// MUST correctly override isRequestHandlerTrivial() to allow auth with PUT
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// (i.e. so that ESPAsyncWebServer parses the body and adds form-data to request params list)
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class ApiBasicWebHandler final : public ApiBaseWebHandler {
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public:
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template <typename Path, typename Callback>
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ApiBasicWebHandler(Path&& path, Callback&& get, Callback&& put) :
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ApiBaseWebHandler(std::forward<Path>(path)),
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_get(std::forward<Callback>(get)),
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_put(std::forward<Callback>(put))
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{}
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bool isRequestHandlerTrivial() override {
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return false;
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}
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bool canHandle(AsyncWebServerRequest* request) override {
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if (!apiEnabled()) {
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return false;
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}
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switch (request->method()) {
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case HTTP_HEAD:
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case HTTP_GET:
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break;
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case HTTP_PUT:
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if (!_apiIsFormDataContent(request)) {
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return false;
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}
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break;
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default:
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return false;
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}
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auto helper = ApiRequestHelper(*request, parts());
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if (helper.match()) {
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_apiAttachHelper(*request, std::move(helper));
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return true;
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}
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return false;
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}
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|
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void handleRequest(AsyncWebServerRequest* request) override {
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if (!apiAuthenticate(request)) {
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request->send(403);
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return;
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}
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|
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if (!_apiAcceptsText(request)) {
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request->send(406, F("text/plain"), F("text/plain"));
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return;
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}
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auto method = request->method();
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const bool is_put = (
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(!apiRestFul()|| (HTTP_PUT == method))
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&& request->hasParam("value", HTTP_PUT == method)
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);
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switch (method) {
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case HTTP_HEAD:
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request->send(204);
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return;
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case HTTP_GET:
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case HTTP_PUT: {
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|
auto& helper = *reinterpret_cast<ApiRequestHelper*>(request->_tempObject);
|
|
|
|
auto apireq = helper.request();
|
|
if (is_put) {
|
|
if (!_put(apireq)) {
|
|
request->send(500);
|
|
return;
|
|
}
|
|
|
|
if (apireq.done()) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!_get(apireq)) {
|
|
request->send(500);
|
|
return;
|
|
}
|
|
|
|
if (!apireq.done()) {
|
|
request->send(204);
|
|
return;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
request->send(405);
|
|
break;
|
|
}
|
|
}
|
|
|
|
const ApiBasicHandler& get() const {
|
|
return _get;
|
|
}
|
|
|
|
const ApiBasicHandler& put() const {
|
|
return _put;
|
|
}
|
|
|
|
const String& pattern() const {
|
|
return ApiBaseWebHandler::pattern();
|
|
}
|
|
|
|
const PathParts& parts() const {
|
|
return ApiBaseWebHandler::parts();
|
|
}
|
|
|
|
private:
|
|
ApiBasicHandler _get;
|
|
ApiBasicHandler _put;
|
|
};
|
|
|
|
std::forward_list<ApiBaseWebHandler*> _apis;
|
|
|
|
template <typename Handler, typename Callback>
|
|
void _apiRegister(const String& path, Callback&& get, Callback&& put) {
|
|
// `String` is a given, since we *do* need to construct this dynamically in sensors
|
|
auto* ptr = new Handler(String(F(API_BASE_PATH)) + path, std::forward<Callback>(get), std::forward<Callback>(put));
|
|
webServer().addHandler(reinterpret_cast<AsyncWebHandler*>(ptr));
|
|
_apis.emplace_front(ptr);
|
|
}
|
|
|
|
} // namespace
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
void apiRegister(const String& path, ApiBasicHandler&& get, ApiBasicHandler&& put) {
|
|
_apiRegister<ApiBasicWebHandler>(path, std::move(get), std::move(put));
|
|
}
|
|
|
|
void apiRegister(const String& path, ApiJsonHandler&& get, ApiJsonHandler&& put) {
|
|
_apiRegister<ApiJsonWebHandler>(path, std::move(get), std::move(put));
|
|
}
|
|
|
|
void apiSetup() {
|
|
apiRegister(F("list"),
|
|
[](ApiRequest& request) {
|
|
String paths;
|
|
for (auto& api : _apis) {
|
|
paths += api->pattern() + "\r\n";
|
|
}
|
|
request.send(paths);
|
|
return true;
|
|
},
|
|
nullptr
|
|
);
|
|
|
|
apiRegister(F("rpc"),
|
|
nullptr,
|
|
[](ApiRequest& request) {
|
|
if (rpcHandleAction(request.param(F("action")))) {
|
|
return apiOk(request);
|
|
}
|
|
return apiError(request);
|
|
}
|
|
);
|
|
|
|
}
|
|
|
|
bool apiOk(ApiRequest& request) {
|
|
request.send(F("OK"));
|
|
return true;
|
|
}
|
|
|
|
bool apiError(ApiRequest& request) {
|
|
request.send(F("ERROR"));
|
|
return true;
|
|
}
|
|
|
|
#endif // API_SUPPORT
|