541 lines
18 KiB
C++
541 lines
18 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015-2017 Danny Robson <danny@nerdcruft.net>
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*/
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#include "schema.hpp"
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#include "tree.hpp"
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#include "except.hpp"
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#include "../debug.hpp"
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#include "../io.hpp"
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#include "../maths.hpp"
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#include <regex>
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///////////////////////////////////////////////////////////////////////////////
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struct length_error : public json::schema_error {
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length_error (const std::string &what):
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schema_error (what)
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{ ; }
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};
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//-----------------------------------------------------------------------------
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struct format_error : public json::schema_error {
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format_error (const std::string &what):
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schema_error (what)
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{ ; }
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};
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///////////////////////////////////////////////////////////////////////////////
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static void validate (json::tree::node&, const json::tree::object&);
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///////////////////////////////////////////////////////////////////////////////
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static void
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validate (json::tree::object &node,
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const json::tree::object &schema)
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{
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auto properties = schema.find ("properties");
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auto additional = schema.find ("additionalProperties");
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auto pattern = schema.find ("patternProperties");
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if (properties != schema.cend ()) {
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for (const auto &kv: properties->second->as_object ()) {
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auto p = node.find (kv.first);
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if (p != node.cend ())
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validate (*p->second, kv.second->as_object ());
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else {
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try {
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node.insert (kv.first, (*kv.second)["default"].clone ());
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validate (node[kv.first], kv.second->as_object ());
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continue;
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} catch (const json::key_error&)
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{ ; }
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if (additional != schema.cend ()) {
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if (additional->second->is_boolean () && !additional->second->as_bool ())
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throw json::schema_error ("additionalProperties");
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validate (*p->second, additional->second->as_object ());
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}
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}
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}
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}
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if (pattern != schema.cend ()) {
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for (auto &cond: pattern->second->as_object ()) {
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std::regex expr (cond.first, std::regex_constants::ECMAScript);
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for (auto &props: node) {
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if (std::regex_search (props.first, expr))
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validate (*props.second, cond.second->as_object ());
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}
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}
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}
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if (schema.has ("dependencies"))
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not_implemented ();
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// properties must be checked after the 'properties' check has a chance to
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// create the defaulted entries.
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auto maxProperties = schema.find ("maxProperties");
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if (maxProperties != schema.cend ())
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if (node.size () > maxProperties->second->as_uint ())
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throw json::schema_error ("maxProperties");
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auto minProperties = schema.find ("minProperties");
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if (minProperties != schema.cend ())
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if (node.size () < minProperties->second->as_uint ())
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throw json::schema_error ("minProperties");
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auto required = schema.find ("required");
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if (required != schema.cend ())
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for (const auto &i: required->second->as_array ())
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if (!node.has (i.as_string ()))
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throw json::schema_error ("required");
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}
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//-----------------------------------------------------------------------------
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static void
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validate (json::tree::array &node,
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const json::tree::object &schema)
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{
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// attempt to match the item and additionalItem schemas
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auto items = schema.find ("items");
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auto additional = schema.find ("additionalItems");
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if (items != schema.cend ()) {
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// items is an object, test all elements with it as a schema
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if (items->second->is_object ()) {
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for (auto &i: node)
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validate (i, items->second->as_object ());
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// items is a list of schemas, test n-elements with it as a schema
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} else if (items->second->is_array ()) {
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const auto &itemArray = items->second->as_array ();
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size_t i = 0;
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for (; i < itemArray.size () && i < node.size (); ++i)
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validate (node[i], itemArray[i].as_object ());
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// we've exhausted the schema list, use the additional schema
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if (i == itemArray.size ()) {
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if (additional->second->is_boolean ()) {
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if (!additional->second->as_boolean ())
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throw json::schema_error ("additional");
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} else if (additional->second->is_object ()) {
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for ( ; i < node.size (); ++i)
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validate (node[i], additional->second->as_object ());
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} else {
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throw json::schema_error ("items");
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}
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}
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}
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}
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auto maxItems = schema.find ("maxItems");
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if (maxItems != schema.cend ())
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if (node.size () > maxItems->second->as_uint ())
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throw json::schema_error ("maxItems");
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auto minItems = schema.find ("minItems");
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if (minItems != schema.cend ())
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if (node.size () < minItems->second->as_uint ())
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throw json::schema_error ("minItems");
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// check all element are unique
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// XXX: uses a naive n^2 brute force search on equality because it's 2am
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// and I don't want to write a type aware comparator for the sort.
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auto unique = schema.find ("uniqueItems");
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if (unique != schema.cend () && unique->second->as_boolean ())
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for (size_t a = 0; a < node.size (); ++a)
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for (size_t b = a + 1; b < node.size (); ++b)
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if (node[a] == node[b])
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throw json::schema_error ("uniqueItems");
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}
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//-----------------------------------------------------------------------------
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static void
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validate (json::tree::string &node,
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const json::tree::object &schema)
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{
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const auto &val = node.native ();
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// check length is less than a maximum
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auto maxLength = schema.find ("maxLength");
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if (maxLength != schema.cend ()) {
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auto cmp = maxLength->second->as_number ().uint ();
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if (!util::is_integer (cmp))
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throw length_error ("maxLength");
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if (val.size () > cmp)
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throw length_error ("maxLength");
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}
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// check length is greater than a maximum
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auto minLength = schema.find ("minLength");
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if (minLength != schema.cend ()) {
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auto cmp = minLength->second->as_number ().uint ();
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if (!util::is_integer (cmp))
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throw length_error ("minLength");
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if (val.size () < cmp)
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throw length_error ("minLength");
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}
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// check the string conforms to a regex
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// Note: this uses the c++11 regex engine which slightly differs from ECMA 262
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auto pattern = schema.find ("pattern");
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if (pattern != schema.cend ()) {
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std::regex r (pattern->second->as_string ().native (),
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std::regex_constants::ECMAScript);
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if (!std::regex_search (val, r))
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throw format_error ("pattern");
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}
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}
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//-----------------------------------------------------------------------------
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template <typename T>
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static void
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validate_number (T val, const json::tree::object &schema) {
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using R = json::tree::number::repr_t;
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// check strictly positive integer multiple
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auto mult = schema.find ("multipleOf");
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if (mult != schema.cend ()) {
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const auto &div = mult->second->as_number ();
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switch (div.repr ()) {
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case R::REAL: if (util::exactly_zero (std::fmod (val, div.real ()))) throw json::schema_error ("multipleOf"); break;
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case R::SINT: if (util::exactly_zero (std::fmod (val, div.sint ()))) throw json::schema_error ("multipleOf"); break;
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case R::UINT: if (util::exactly_zero (std::fmod (val, div.uint ()))) throw json::schema_error ("multipleOf"); break;
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}
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}
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// check maximum holds. exclusive requires max condition.
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auto max = schema.find ("maximum");
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auto exclusiveMax = schema.find ("exclusiveMaximum");
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if (max != schema.end ()) {
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const auto &cmp = max->second->as_number ();
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if (exclusiveMax != schema.end () && exclusiveMax->second->as_boolean ()) {
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switch (cmp.repr ()) {
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case R::REAL:
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if (T(val) >= cmp.real ())
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throw json::schema_error ("exclusiveMax");
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break;
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case R::SINT:
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if (json::tree::number::sint_t(std::numeric_limits<T>::max ()) >= cmp.sint () &&
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val >= T(cmp.sint ()))
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{
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throw json::schema_error ("exclusiveMax");
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}
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break;
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case R::UINT:
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if (json::tree::number::uint_t(std::numeric_limits<T>::max ()) >= cmp.uint () &&
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val >= T(cmp.uint ()))
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{
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throw json::schema_error ("exclusiveMax");
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}
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break;
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}
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} else {
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switch (cmp.repr ()) {
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case R::REAL:
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if (T(val) > cmp.real ())
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throw json::schema_error ("maximum");
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break;
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case R::SINT:
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if (json::tree::number::sint_t(std::numeric_limits<T>::max ()) >= cmp.sint () &&
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val >= T(cmp.sint ()))
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{
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throw json::schema_error ("maximum");
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}
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break;
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case R::UINT:
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if (json::tree::number::uint_t(std::numeric_limits<T>::max ()) >= cmp.uint () &&
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val >= T(cmp.uint ()))
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{
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throw json::schema_error ("maximum");
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}
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break;
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}
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}
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} else {
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if (exclusiveMax != schema.cend ())
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throw json::schema_error ("exclusiveMax");
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}
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// check minimum holds. exclusive requires min condition
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auto min = schema.find ("minimum");
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auto exclusiveMin = schema.find ("exclusiveMinimum");
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if (min != schema.end ()) {
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const auto &cmp = min->second->as_number ();
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if (exclusiveMin != schema.end () && exclusiveMin->second->as_boolean ()) {
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switch (cmp.repr ()) {
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case R::REAL:
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if (T(val) < cmp.real ())
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throw json::schema_error ("exclusiveMin");
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break;
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case R::SINT:
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if (cmp.sint () > json::tree::number::sint_t(std::numeric_limits<T>::min ()) &&
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val < T(cmp.sint ()))
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{
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throw json::schema_error ("exclusiveMin");
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}
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break;
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case R::UINT:
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if (cmp.uint () > json::tree::number::uint_t(std::numeric_limits<T>::min ()) &&
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val < T(cmp.uint ()))
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{
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throw json::schema_error ("exclusiveMin");
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}
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break;
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}
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} else {
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switch (cmp.repr ()) {
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case R::REAL:
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if (T(val) <= cmp.real ())
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throw json::schema_error ("minimum");
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break;
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case R::SINT:
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if (cmp.sint () >= json::tree::number::sint_t(std::numeric_limits<T>::min ()) &&
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val <= T(cmp.sint ()))
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{
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throw json::schema_error ("minimum");
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}
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break;
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case R::UINT:
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if (cmp.uint () >= json::tree::number::uint_t(std::numeric_limits<T>::min ()) &&
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val <= T(cmp.uint ()))
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{
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throw json::schema_error ("minimum");
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}
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break;
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}
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}
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} else {
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if (exclusiveMin != schema.cend ())
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throw json::schema_error ("exclusiveMin");
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}
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}
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//-----------------------------------------------------------------------------
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static void
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validate (json::tree::number &node,
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const json::tree::object &schema)
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{
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using N = json::tree::number;
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using R = N::repr_t;
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switch (node.repr ()) {
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case R::REAL: validate_number<N::real_t> (node.real (), schema); break;
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case R::SINT: validate_number<N::sint_t> (node.sint (), schema); break;
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case R::UINT: validate_number<N::uint_t> (node.uint (), schema); break;
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}
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}
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//-----------------------------------------------------------------------------
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static void
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validate (json::tree::boolean&,
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const json::tree::object&)
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{ ; }
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//-----------------------------------------------------------------------------
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static void
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validate (json::tree::null&,
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const json::tree::object&)
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{ ; }
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//-----------------------------------------------------------------------------
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static std::string
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to_string (json::tree::type_t t)
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{
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switch (t) {
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case json::tree::OBJECT: return "object";
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case json::tree::ARRAY: return "array";
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case json::tree::STRING: return "string";
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case json::tree::NUMBER: return "number";
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case json::tree::BOOLEAN: return "boolean";
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case json::tree::NONE: return "null";
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}
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unreachable ();
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}
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//-----------------------------------------------------------------------------
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static bool
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is_type_valid (const json::tree::node &node, const std::string &type)
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{
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if (type == "integer") return node.is_integer ();
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if (type == "number") return node.is_number ();
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if (type == "string") return node.is_string ();
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if (type == "object") return node.is_object ();
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if (type == "array") return node.is_array ();
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if (type == "boolean") return node.is_boolean ();
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if (type == "null") return node.is_null ();
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return false;
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}
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//-----------------------------------------------------------------------------
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static void
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validate (json::tree::node &node,
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const json::tree::object &schema)
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{
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// check the value is in the prescribed list
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auto enumPos = schema.find ("enum");
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if (enumPos != schema.cend ()) {
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auto pos = std::find (enumPos->second->as_array ().cbegin (),
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enumPos->second->as_array ().cend (),
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node);
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if (pos == enumPos->second->as_array ().cend ())
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throw json::schema_error ("enum");
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}
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// check the value is the correct type
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auto type = schema.find ("type");
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if (type != schema.cend ()) {
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// check against a single named type
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if (type->second->is_string ()) {
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if (!is_type_valid (node, type->second->as_string ()))
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throw json::schema_error ("type");
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// check against an array of types
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} else if (type->second->is_array ()) {
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auto pos = std::find_if (type->second->as_array ().begin (),
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type->second->as_array ().end (),
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[&] (const auto &i) { return i.as_string () == to_string (node.type ()); });
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if (pos == type->second->as_array ().end ())
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throw json::schema_error ("type");
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} else
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throw json::schema_error ("type");
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}
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auto allOf = schema.find ("allOf");
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if (allOf != schema.cend ()) {
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for (const auto &i: allOf->second->as_array ())
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validate (node, i.as_object ());
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}
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auto anyOf = schema.find ("anyOf");
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if (anyOf != schema.cend ()) {
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bool success = false;
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for (const auto &i: anyOf->second->as_array ()) {
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try {
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validate (node, i.as_object ());
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success = true;
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break;
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} catch (const json::schema_error&)
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{ continue; }
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}
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if (!success)
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throw json::schema_error ("anyOf");
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}
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auto oneOf = schema.find ("oneOf");
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if (oneOf != schema.cend ()) {
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unsigned count = 0;
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for (const auto &i: oneOf->second->as_array ()) {
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try {
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validate (node, i.as_object ());
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count++;
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} catch (const json::schema_error&)
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{ ; }
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if (count > 1)
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throw json::schema_error ("oneOf");
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}
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if (count != 1)
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throw json::schema_error ("oneOf");
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}
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auto notSchema = schema.find ("not");
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if (notSchema != schema.cend ()) {
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for (const auto &i: notSchema->second->as_array ()) {
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bool valid = false;
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try {
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validate (node, i.as_object ());
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valid = true;
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} catch (const json::schema_error&)
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{ ; }
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if (valid)
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throw json::schema_error ("not");
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}
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}
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switch (node.type ()) {
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case json::tree::OBJECT: validate (node.as_object (), schema); return;
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case json::tree::ARRAY: validate (node.as_array (), schema); return;
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case json::tree::STRING: validate (node.as_string (), schema); return;
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case json::tree::NUMBER: validate (node.as_number (), schema); return;
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case json::tree::BOOLEAN: validate (node.as_boolean (), schema); return;
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case json::tree::NONE: validate (node.as_null (), schema); return;
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}
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unreachable ();
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}
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//-----------------------------------------------------------------------------
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void
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json::schema::validate (json::tree::node &data,
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const json::tree::object &schema)
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{
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auto title = schema.find ("title");
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if (title != schema.cend ())
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if (!title->second->is_string ())
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throw json::schema_error ("title");
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auto description = schema.find ("description");
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if (description != schema.cend ())
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if (!description->second->is_string ())
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throw json::schema_error ("description");
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return ::validate (data, schema.as_object ());
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}
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//-----------------------------------------------------------------------------
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void
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json::schema::validate (json::tree::node &data,
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const std::experimental::filesystem::path &schema_path)
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{
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const util::mapped_file schema_data (schema_path);
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auto schema_object = json::tree::parse (util::view(schema_data).cast<const char> ());
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validate (data, schema_object->as_object ());
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}
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