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// Licensed under the Apache-2.0 license. See README.md for details.
#include "Json.h"
#include <QFile>
#include <QSaveFile>
#include "FileSystem.h"
#include <math.h>
namespace Json
{
void write(const QJsonDocument &doc, const QString &filename)
{
FS::write(filename, doc.toJson());
}
void write(const QJsonObject &object, const QString &filename)
{
write(QJsonDocument(object), filename);
}
void write(const QJsonArray &array, const QString &filename)
{
write(QJsonDocument(array), filename);
}
QByteArray toBinary(const QJsonObject &obj)
{
return QJsonDocument(obj).toBinaryData();
}
QByteArray toBinary(const QJsonArray &array)
{
return QJsonDocument(array).toBinaryData();
}
QByteArray toText(const QJsonObject &obj)
{
return QJsonDocument(obj).toJson(QJsonDocument::Compact);
}
QByteArray toText(const QJsonArray &array)
{
return QJsonDocument(array).toJson(QJsonDocument::Compact);
}
static bool isBinaryJson(const QByteArray &data)
{
decltype(QJsonDocument::BinaryFormatTag) tag = QJsonDocument::BinaryFormatTag;
return memcmp(data.constData(), &tag, sizeof(QJsonDocument::BinaryFormatTag)) == 0;
}
QJsonDocument ensureDocument(const QByteArray &data, const QString &what)
{
if (isBinaryJson(data))
{
QJsonDocument doc = QJsonDocument::fromBinaryData(data);
if (doc.isNull())
{
throw JsonException(what + ": Invalid JSON (binary JSON detected)");
}
return doc;
}
else
{
QJsonParseError error;
QJsonDocument doc = QJsonDocument::fromJson(data, &error);
if (error.error != QJsonParseError::NoError)
{
throw JsonException(what + ": Error parsing JSON: " + error.errorString());
}
return doc;
}
}
QJsonDocument ensureDocument(const QString &filename, const QString &what)
{
return ensureDocument(FS::read(filename), what);
}
QJsonObject ensureObject(const QJsonDocument &doc, const QString &what)
{
if (!doc.isObject())
{
throw JsonException(what + " is not an object");
}
return doc.object();
}
QJsonArray ensureArray(const QJsonDocument &doc, const QString &what)
{
if (!doc.isArray())
{
throw JsonException(what + " is not an array");
}
return doc.array();
}
void writeString(QJsonObject &to, const QString &key, const QString &value)
{
if (!value.isEmpty())
{
to.insert(key, value);
}
}
void writeStringList(QJsonObject &to, const QString &key, const QStringList &values)
{
if (!values.isEmpty())
{
QJsonArray array;
for(auto value: values)
{
array.append(value);
}
to.insert(key, array);
}
}
template<>
QJsonValue toJson<QUrl>(const QUrl &url)
{
return QJsonValue(url.toString(QUrl::FullyEncoded));
}
template<>
QJsonValue toJson<QByteArray>(const QByteArray &data)
{
return QJsonValue(QString::fromLatin1(data.toHex()));
}
template<>
QJsonValue toJson<QDateTime>(const QDateTime &datetime)
{
return QJsonValue(datetime.toString(Qt::ISODate));
}
template<>
QJsonValue toJson<QDir>(const QDir &dir)
{
return QDir::current().relativeFilePath(dir.absolutePath());
}
template<>
QJsonValue toJson<QUuid>(const QUuid &uuid)
{
return uuid.toString();
}
template<>
QJsonValue toJson<QVariant>(const QVariant &variant)
{
return QJsonValue::fromVariant(variant);
}
template<> QByteArray ensureIsType<QByteArray>(const QJsonValue &value, const Requirement,
const QString &what)
{
const QString string = ensureIsType<QString>(value, Required, what);
// ensure that the string can be safely cast to Latin1
if (string != QString::fromLatin1(string.toLatin1()))
{
throw JsonException(what + " is not encodable as Latin1");
}
return QByteArray::fromHex(string.toLatin1());
}
template<> QJsonArray ensureIsType<QJsonArray>(const QJsonValue &value, const Requirement, const QString &what)
{
if (!value.isArray())
{
throw JsonException(what + " is not an array");
}
return value.toArray();
}
template<> QString ensureIsType<QString>(const QJsonValue &value, const Requirement, const QString &what)
{
if (!value.isString())
{
throw JsonException(what + " is not a string");
}
return value.toString();
}
template<> bool ensureIsType<bool>(const QJsonValue &value, const Requirement,
const QString &what)
{
if (!value.isBool())
{
throw JsonException(what + " is not a bool");
}
return value.toBool();
}
template<> double ensureIsType<double>(const QJsonValue &value, const Requirement,
const QString &what)
{
if (!value.isDouble())
{
throw JsonException(what + " is not a double");
}
return value.toDouble();
}
template<> int ensureIsType<int>(const QJsonValue &value, const Requirement,
const QString &what)
{
const double doubl = ensureIsType<double>(value, Required, what);
if (fmod(doubl, 1) != 0)
{
throw JsonException(what + " is not an integer");
}
return int(doubl);
}
template<> QDateTime ensureIsType<QDateTime>(const QJsonValue &value, const Requirement,
const QString &what)
{
const QString string = ensureIsType<QString>(value, Required, what);
const QDateTime datetime = QDateTime::fromString(string, Qt::ISODate);
if (!datetime.isValid())
{
throw JsonException(what + " is not a ISO formatted date/time value");
}
return datetime;
}
template<> QUrl ensureIsType<QUrl>(const QJsonValue &value, const Requirement,
const QString &what)
{
const QString string = ensureIsType<QString>(value, Required, what);
if (string.isEmpty())
{
return QUrl();
}
const QUrl url = QUrl(string, QUrl::StrictMode);
if (!url.isValid())
{
throw JsonException(what + " is not a correctly formatted URL");
}
return url;
}
template<> QDir ensureIsType<QDir>(const QJsonValue &value, const Requirement, const QString &what)
{
const QString string = ensureIsType<QString>(value, Required, what);
return QDir::current().absoluteFilePath(string);
}
template<> QUuid ensureIsType<QUuid>(const QJsonValue &value, const Requirement, const QString &what)
{
const QString string = ensureIsType<QString>(value, Required, what);
const QUuid uuid = QUuid(string);
if (uuid.toString() != string) // converts back => valid
{
throw JsonException(what + " is not a valid UUID");
}
return uuid;
}
template<> QJsonObject ensureIsType<QJsonObject>(const QJsonValue &value, const Requirement, const QString &what)
{
if (!value.isObject())
{
throw JsonException(what + " is not an object");
}
return value.toObject();
}
template<> QVariant ensureIsType<QVariant>(const QJsonValue &value, const Requirement, const QString &what)
{
if (value.isNull() || value.isUndefined())
{
throw JsonException(what + " is null or undefined");
}
return value.toVariant();
}
template<> QJsonValue ensureIsType<QJsonValue>(const QJsonValue &value, const Requirement, const QString &what)
{
if (value.isNull() || value.isUndefined())
{
throw JsonException(what + " is null or undefined");
}
return value;
}
}
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