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462 lines
21 KiB
462 lines
21 KiB
// Copyright (c) 2015 Sandstorm Development Group, Inc. and contributors
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// Licensed under the MIT License:
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef CAPNP_COMPAT_JSON_H_
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#define CAPNP_COMPAT_JSON_H_
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#include <capnp/schema.h>
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#include <capnp/dynamic.h>
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#include <capnp/compat/json.capnp.h>
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namespace capnp {
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class JsonCodec {
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// Flexible class for encoding Cap'n Proto types as JSON, and decoding JSON back to Cap'n Proto.
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//
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// Typical usage:
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//
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// JsonCodec json;
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//
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// // encode
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// kj::String encoded = json.encode(someStructReader);
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//
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// // decode
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// json.decode(encoded, someStructBuilder);
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//
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// Advanced users can do fancy things like override the way certain types or fields are
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// represented in JSON by registering handlers. See the unit test for an example.
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//
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// Notes:
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// - When encoding, all primitive fields are always encoded, even if default-valued. Pointer
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// fields are only encoded if they are non-null.
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// - 64-bit integers are encoded as strings, since JSON "numbers" are double-precision floating
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// points which cannot store a 64-bit integer without losing data.
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// - NaNs and infinite floating point numbers are not allowed by the JSON spec, and so are encoded
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// as null. This matches the behavior of `JSON.stringify` in at least Firefox and Chrome.
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// - Data is encoded as an array of numbers in the range [0,255]. You probably want to register
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// a handler that does something better, like maybe base64 encoding, but there are a zillion
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// different ways people do this.
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// - Encoding/decoding capabilities and AnyPointers requires registering a Handler, since there's
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// no obvious default behavior.
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// - When decoding, unrecognized field names are ignored. Note: This means that JSON is NOT a
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// good format for receiving input from a human. Consider `capnp eval` or the SchemaParser
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// library for human input.
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public:
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JsonCodec();
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~JsonCodec() noexcept(false);
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// ---------------------------------------------------------------------------
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// standard API
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void setPrettyPrint(bool enabled);
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// Enable to insert newlines, indentation, and other extra spacing into the output. The default
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// is to use minimal whitespace.
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void setMaxNestingDepth(size_t maxNestingDepth);
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// Set maximum nesting depth when decoding JSON to prevent highly nested input from overflowing
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// the call stack. The default is 64.
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template <typename T>
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kj::String encode(T&& value);
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// Encode any Cap'n Proto value to JSON, including primitives and
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// Dynamic{Enum,Struct,List,Capability}, but not DynamicValue (see below).
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kj::String encode(DynamicValue::Reader value, Type type) const;
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// Encode a DynamicValue to JSON. `type` is needed because `DynamicValue` itself does
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// not distinguish between e.g. int32 and int64, which in JSON are handled differently. Most
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// of the time, though, you can use the single-argument templated version of `encode()` instead.
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void decode(kj::ArrayPtr<const char> input, DynamicStruct::Builder output) const;
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// Decode JSON text directly into a struct builder. This only works for structs since lists
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// need to be allocated with the correct size in advance.
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//
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// (Remember that any Cap'n Proto struct reader type can be implicitly cast to
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// DynamicStruct::Reader.)
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template <typename T>
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Orphan<T> decode(kj::ArrayPtr<const char> input, Orphanage orphanage) const;
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// Decode JSON text to any Cap'n Proto object (pointer value), allocated using the given
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// orphanage. T must be specified explicitly and cannot be dynamic, e.g.:
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//
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// Orphan<MyType> orphan = json.decode<MyType>(text, orphanage);
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template <typename T>
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ReaderFor<T> decode(kj::ArrayPtr<const char> input) const;
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// Decode JSON text into a primitive or capability value. T must be specified explicitly and
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// cannot be dynamic, e.g.:
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//
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// uint32_t n = json.decode<uint32_t>(text);
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Orphan<DynamicValue> decode(kj::ArrayPtr<const char> input, Type type, Orphanage orphanage) const;
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Orphan<DynamicList> decode(
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kj::ArrayPtr<const char> input, ListSchema type, Orphanage orphanage) const;
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Orphan<DynamicStruct> decode(
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kj::ArrayPtr<const char> input, StructSchema type, Orphanage orphanage) const;
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DynamicCapability::Client decode(kj::ArrayPtr<const char> input, InterfaceSchema type) const;
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DynamicEnum decode(kj::ArrayPtr<const char> input, EnumSchema type) const;
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// Decode to a dynamic value, specifying the type schema.
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// ---------------------------------------------------------------------------
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// layered API
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//
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// You can separate text <-> JsonValue from JsonValue <-> T. These are particularly useful
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// for calling from Handler implementations.
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kj::String encodeRaw(JsonValue::Reader value) const;
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void decodeRaw(kj::ArrayPtr<const char> input, JsonValue::Builder output) const;
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// Translate JsonValue <-> text.
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template <typename T>
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void encode(T&& value, JsonValue::Builder output);
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void encode(DynamicValue::Reader input, Type type, JsonValue::Builder output) const;
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void decode(JsonValue::Reader input, DynamicStruct::Builder output) const;
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template <typename T>
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Orphan<T> decode(JsonValue::Reader input, Orphanage orphanage) const;
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template <typename T>
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ReaderFor<T> decode(JsonValue::Reader input) const;
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Orphan<DynamicValue> decode(JsonValue::Reader input, Type type, Orphanage orphanage) const;
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Orphan<DynamicList> decode(JsonValue::Reader input, ListSchema type, Orphanage orphanage) const;
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Orphan<DynamicStruct> decode(
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JsonValue::Reader input, StructSchema type, Orphanage orphanage) const;
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DynamicCapability::Client decode(JsonValue::Reader input, InterfaceSchema type) const;
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DynamicEnum decode(JsonValue::Reader input, EnumSchema type) const;
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// ---------------------------------------------------------------------------
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// specializing particular types
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template <typename T, Style s = style<T>()>
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class Handler;
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// Implement this interface to specify a special encoding for a particular type or field.
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//
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// The templates are a bit ugly, but subclasses of this type essentially implement two methods,
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// one to encode values of this type and one to decode values of this type. `encode()` is simple:
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//
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// void encode(const JsonCodec& codec, ReaderFor<T> input, JsonValue::Builder output) const;
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//
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// `decode()` is a bit trickier. When T is a struct (including DynamicStruct), it is:
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//
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// void decode(const JsonCodec& codec, JsonValue::Reader input, BuilderFor<T> output) const;
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//
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// However, when T is a primitive, decode() is:
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//
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// T decode(const JsonCodec& codec, JsonValue::Reader input) const;
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//
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// Or when T is any non-struct object (list, blob), decode() is:
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//
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// Orphan<T> decode(const JsonCodec& codec, JsonValue::Reader input, Orphanage orphanage) const;
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//
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// Or when T is an interface:
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//
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// T::Client decode(const JsonCodec& codec, JsonValue::Reader input) const;
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//
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// Additionally, when T is a struct you can *optionally* also implement the orphan-returning form
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// of decode(), but it will only be called when the struct would be allocated as an individual
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// object, not as part of a list. This allows you to return "nullptr" in these cases to say that
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// the pointer value should be null. This does not apply to list elements because struct list
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// elements cannot ever be null (since Cap'n Proto encodes struct lists as a flat list rather
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// than list-of-pointers).
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template <typename T>
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void addTypeHandler(Handler<T>& handler);
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void addTypeHandler(Type type, Handler<DynamicValue>& handler);
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void addTypeHandler(EnumSchema type, Handler<DynamicEnum>& handler);
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void addTypeHandler(StructSchema type, Handler<DynamicStruct>& handler);
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void addTypeHandler(ListSchema type, Handler<DynamicList>& handler);
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void addTypeHandler(InterfaceSchema type, Handler<DynamicCapability>& handler);
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// Arrange that whenever the type T appears in the message, your handler will be used to
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// encode/decode it.
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//
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// Note that if you register a handler for a capability type, it will also apply to subtypes.
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// Thus Handler<Capability> handles all capabilities.
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template <typename T>
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void addFieldHandler(StructSchema::Field field, Handler<T>& handler);
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// Matches only the specific field. T can be a dynamic type. T must match the field's type.
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private:
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class HandlerBase;
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struct Impl;
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kj::Own<Impl> impl;
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void encodeField(StructSchema::Field field, DynamicValue::Reader input,
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JsonValue::Builder output) const;
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void decodeArray(List<JsonValue>::Reader input, DynamicList::Builder output) const;
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void decodeObject(List<JsonValue::Field>::Reader input, DynamicStruct::Builder output) const;
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void addTypeHandlerImpl(Type type, HandlerBase& handler);
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void addFieldHandlerImpl(StructSchema::Field field, Type type, HandlerBase& handler);
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};
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// =======================================================================================
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// inline implementation details
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template <typename T>
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kj::String JsonCodec::encode(T&& value) {
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typedef FromAny<kj::Decay<T>> Base;
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return encode(DynamicValue::Reader(ReaderFor<Base>(kj::fwd<T>(value))), Type::from<Base>());
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}
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template <typename T>
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inline Orphan<T> JsonCodec::decode(kj::ArrayPtr<const char> input, Orphanage orphanage) const {
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return decode(input, Type::from<T>(), orphanage).template releaseAs<T>();
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}
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template <typename T>
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inline ReaderFor<T> JsonCodec::decode(kj::ArrayPtr<const char> input) const {
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static_assert(style<T>() == Style::PRIMITIVE || style<T>() == Style::CAPABILITY,
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"must specify an orphanage to decode an object type");
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return decode(input, Type::from<T>(), Orphanage()).getReader().template as<T>();
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}
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inline Orphan<DynamicList> JsonCodec::decode(
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kj::ArrayPtr<const char> input, ListSchema type, Orphanage orphanage) const {
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return decode(input, Type(type), orphanage).releaseAs<DynamicList>();
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}
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inline Orphan<DynamicStruct> JsonCodec::decode(
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kj::ArrayPtr<const char> input, StructSchema type, Orphanage orphanage) const {
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return decode(input, Type(type), orphanage).releaseAs<DynamicStruct>();
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}
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inline DynamicCapability::Client JsonCodec::decode(
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kj::ArrayPtr<const char> input, InterfaceSchema type) const {
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return decode(input, Type(type), Orphanage()).getReader().as<DynamicCapability>();
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}
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inline DynamicEnum JsonCodec::decode(kj::ArrayPtr<const char> input, EnumSchema type) const {
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return decode(input, Type(type), Orphanage()).getReader().as<DynamicEnum>();
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}
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// -----------------------------------------------------------------------------
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template <typename T>
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void JsonCodec::encode(T&& value, JsonValue::Builder output) {
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typedef FromAny<kj::Decay<T>> Base;
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encode(DynamicValue::Reader(ReaderFor<Base>(kj::fwd<T>(value))), Type::from<Base>(), output);
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}
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template <typename T>
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inline Orphan<T> JsonCodec::decode(JsonValue::Reader input, Orphanage orphanage) const {
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return decode(input, Type::from<T>(), orphanage).template releaseAs<T>();
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}
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template <typename T>
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inline ReaderFor<T> JsonCodec::decode(JsonValue::Reader input) const {
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static_assert(style<T>() == Style::PRIMITIVE || style<T>() == Style::CAPABILITY,
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"must specify an orphanage to decode an object type");
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return decode(input, Type::from<T>(), Orphanage()).getReader().template as<T>();
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}
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inline Orphan<DynamicList> JsonCodec::decode(
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JsonValue::Reader input, ListSchema type, Orphanage orphanage) const {
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return decode(input, Type(type), orphanage).releaseAs<DynamicList>();
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}
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inline Orphan<DynamicStruct> JsonCodec::decode(
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JsonValue::Reader input, StructSchema type, Orphanage orphanage) const {
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return decode(input, Type(type), orphanage).releaseAs<DynamicStruct>();
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}
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inline DynamicCapability::Client JsonCodec::decode(
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JsonValue::Reader input, InterfaceSchema type) const {
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return decode(input, Type(type), Orphanage()).getReader().as<DynamicCapability>();
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}
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inline DynamicEnum JsonCodec::decode(JsonValue::Reader input, EnumSchema type) const {
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return decode(input, Type(type), Orphanage()).getReader().as<DynamicEnum>();
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}
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// -----------------------------------------------------------------------------
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class JsonCodec::HandlerBase {
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// Internal helper; ignore.
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public:
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virtual void encodeBase(const JsonCodec& codec, DynamicValue::Reader input,
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JsonValue::Builder output) const = 0;
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virtual Orphan<DynamicValue> decodeBase(const JsonCodec& codec, JsonValue::Reader input,
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Type type, Orphanage orphanage) const;
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virtual void decodeStructBase(const JsonCodec& codec, JsonValue::Reader input,
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DynamicStruct::Builder output) const;
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};
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template <typename T>
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class JsonCodec::Handler<T, Style::POINTER>: private JsonCodec::HandlerBase {
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public:
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virtual void encode(const JsonCodec& codec, ReaderFor<T> input,
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JsonValue::Builder output) const = 0;
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virtual Orphan<T> decode(const JsonCodec& codec, JsonValue::Reader input,
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Orphanage orphanage) const = 0;
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private:
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void encodeBase(const JsonCodec& codec, DynamicValue::Reader input,
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JsonValue::Builder output) const override final {
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encode(codec, input.as<T>(), output);
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}
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Orphan<DynamicValue> decodeBase(const JsonCodec& codec, JsonValue::Reader input,
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Type type, Orphanage orphanage) const override final {
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return decode(codec, input, orphanage);
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}
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friend class JsonCodec;
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};
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template <typename T>
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class JsonCodec::Handler<T, Style::STRUCT>: private JsonCodec::HandlerBase {
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public:
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virtual void encode(const JsonCodec& codec, ReaderFor<T> input,
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JsonValue::Builder output) const = 0;
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virtual void decode(const JsonCodec& codec, JsonValue::Reader input,
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BuilderFor<T> output) const = 0;
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virtual Orphan<T> decode(const JsonCodec& codec, JsonValue::Reader input,
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Orphanage orphanage) const {
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// If subclass does not override, fall back to regular version.
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auto result = orphanage.newOrphan<T>();
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decode(codec, input, result.get());
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return result;
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}
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private:
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void encodeBase(const JsonCodec& codec, DynamicValue::Reader input,
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JsonValue::Builder output) const override final {
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encode(codec, input.as<T>(), output);
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}
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Orphan<DynamicValue> decodeBase(const JsonCodec& codec, JsonValue::Reader input,
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Type type, Orphanage orphanage) const override final {
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return decode(codec, input, orphanage);
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}
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void decodeStructBase(const JsonCodec& codec, JsonValue::Reader input,
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DynamicStruct::Builder output) const override final {
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decode(codec, input, output.as<T>());
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}
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friend class JsonCodec;
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};
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template <>
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class JsonCodec::Handler<DynamicStruct>: private JsonCodec::HandlerBase {
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// Almost identical to Style::STRUCT except that we pass the struct type to decode().
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public:
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virtual void encode(const JsonCodec& codec, DynamicStruct::Reader input,
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JsonValue::Builder output) const = 0;
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virtual void decode(const JsonCodec& codec, JsonValue::Reader input,
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DynamicStruct::Builder output) const = 0;
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virtual Orphan<DynamicStruct> decode(const JsonCodec& codec, JsonValue::Reader input,
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StructSchema type, Orphanage orphanage) const {
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// If subclass does not override, fall back to regular version.
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auto result = orphanage.newOrphan(type);
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decode(codec, input, result.get());
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return result;
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}
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private:
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void encodeBase(const JsonCodec& codec, DynamicValue::Reader input,
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JsonValue::Builder output) const override final {
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encode(codec, input.as<DynamicStruct>(), output);
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}
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Orphan<DynamicValue> decodeBase(const JsonCodec& codec, JsonValue::Reader input,
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Type type, Orphanage orphanage) const override final {
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return decode(codec, input, type.asStruct(), orphanage);
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}
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void decodeStructBase(const JsonCodec& codec, JsonValue::Reader input,
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DynamicStruct::Builder output) const override final {
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decode(codec, input, output.as<DynamicStruct>());
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}
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friend class JsonCodec;
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};
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template <typename T>
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class JsonCodec::Handler<T, Style::PRIMITIVE>: private JsonCodec::HandlerBase {
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public:
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virtual void encode(const JsonCodec& codec, T input, JsonValue::Builder output) const = 0;
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virtual T decode(const JsonCodec& codec, JsonValue::Reader input) const = 0;
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private:
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void encodeBase(const JsonCodec& codec, DynamicValue::Reader input,
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JsonValue::Builder output) const override final {
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encode(codec, input.as<T>(), output);
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}
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Orphan<DynamicValue> decodeBase(const JsonCodec& codec, JsonValue::Reader input,
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Type type, Orphanage orphanage) const override final {
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return decode(codec, input);
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}
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friend class JsonCodec;
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};
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template <typename T>
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class JsonCodec::Handler<T, Style::CAPABILITY>: private JsonCodec::HandlerBase {
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public:
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virtual void encode(const JsonCodec& codec, typename T::Client input,
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JsonValue::Builder output) const = 0;
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virtual typename T::Client decode(const JsonCodec& codec, JsonValue::Reader input) const = 0;
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private:
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void encodeBase(const JsonCodec& codec, DynamicValue::Reader input,
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JsonValue::Builder output) const override final {
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encode(codec, input.as<T>(), output);
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}
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Orphan<DynamicValue> decodeBase(const JsonCodec& codec, JsonValue::Reader input,
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Type type, Orphanage orphanage) const override final {
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return orphanage.newOrphanCopy(decode(codec, input));
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}
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friend class JsonCodec;
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};
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template <typename T>
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inline void JsonCodec::addTypeHandler(Handler<T>& handler) {
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addTypeHandlerImpl(Type::from<T>(), handler);
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}
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inline void JsonCodec::addTypeHandler(Type type, Handler<DynamicValue>& handler) {
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addTypeHandlerImpl(type, handler);
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}
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inline void JsonCodec::addTypeHandler(EnumSchema type, Handler<DynamicEnum>& handler) {
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addTypeHandlerImpl(type, handler);
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}
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inline void JsonCodec::addTypeHandler(StructSchema type, Handler<DynamicStruct>& handler) {
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addTypeHandlerImpl(type, handler);
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}
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inline void JsonCodec::addTypeHandler(ListSchema type, Handler<DynamicList>& handler) {
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addTypeHandlerImpl(type, handler);
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}
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inline void JsonCodec::addTypeHandler(InterfaceSchema type, Handler<DynamicCapability>& handler) {
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addTypeHandlerImpl(type, handler);
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}
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template <typename T>
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inline void JsonCodec::addFieldHandler(StructSchema::Field field, Handler<T>& handler) {
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addFieldHandlerImpl(field, Type::from<T>(), handler);
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}
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template <> void JsonCodec::addTypeHandler(Handler<DynamicValue>& handler)
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KJ_UNAVAILABLE("JSON handlers for type sets (e.g. all structs, all lists) not implemented; "
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"try specifying a specific type schema as the first parameter");
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template <> void JsonCodec::addTypeHandler(Handler<DynamicEnum>& handler)
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KJ_UNAVAILABLE("JSON handlers for type sets (e.g. all structs, all lists) not implemented; "
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"try specifying a specific type schema as the first parameter");
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template <> void JsonCodec::addTypeHandler(Handler<DynamicStruct>& handler)
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KJ_UNAVAILABLE("JSON handlers for type sets (e.g. all structs, all lists) not implemented; "
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"try specifying a specific type schema as the first parameter");
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template <> void JsonCodec::addTypeHandler(Handler<DynamicList>& handler)
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KJ_UNAVAILABLE("JSON handlers for type sets (e.g. all structs, all lists) not implemented; "
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"try specifying a specific type schema as the first parameter");
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template <> void JsonCodec::addTypeHandler(Handler<DynamicCapability>& handler)
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KJ_UNAVAILABLE("JSON handlers for type sets (e.g. all structs, all lists) not implemented; "
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"try specifying a specific type schema as the first parameter");
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// TODO(someday): Implement support for registering handlers that cover thinsg like "all structs"
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// or "all lists". Currently you can only target a specific struct or list type.
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} // namespace capnp
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#endif // CAPNP_COMPAT_JSON_H_
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