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-rw-r--r--libraries/logic/Json.cpp272
1 files changed, 272 insertions, 0 deletions
diff --git a/libraries/logic/Json.cpp b/libraries/logic/Json.cpp
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+++ b/libraries/logic/Json.cpp
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+// Licensed under the Apache-2.0 license. See README.md for details.
+
+#include "Json.h"
+
+#include <QFile>
+
+#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 requireDocument(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 requireDocument(const QString &filename, const QString &what)
+{
+ return requireDocument(FS::read(filename), what);
+}
+QJsonObject requireObject(const QJsonDocument &doc, const QString &what)
+{
+ if (!doc.isObject())
+ {
+ throw JsonException(what + " is not an object");
+ }
+ return doc.object();
+}
+QJsonArray requireArray(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 requireIsType<QByteArray>(const QJsonValue &value, const QString &what)
+{
+ const QString string = ensureIsType<QString>(value, 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 requireIsType<QJsonArray>(const QJsonValue &value, const QString &what)
+{
+ if (!value.isArray())
+ {
+ throw JsonException(what + " is not an array");
+ }
+ return value.toArray();
+}
+
+
+template<> QString requireIsType<QString>(const QJsonValue &value, const QString &what)
+{
+ if (!value.isString())
+ {
+ throw JsonException(what + " is not a string");
+ }
+ return value.toString();
+}
+
+template<> bool requireIsType<bool>(const QJsonValue &value, const QString &what)
+{
+ if (!value.isBool())
+ {
+ throw JsonException(what + " is not a bool");
+ }
+ return value.toBool();
+}
+
+template<> double requireIsType<double>(const QJsonValue &value, const QString &what)
+{
+ if (!value.isDouble())
+ {
+ throw JsonException(what + " is not a double");
+ }
+ return value.toDouble();
+}
+
+template<> int requireIsType<int>(const QJsonValue &value, const QString &what)
+{
+ const double doubl = requireIsType<double>(value, what);
+ if (fmod(doubl, 1) != 0)
+ {
+ throw JsonException(what + " is not an integer");
+ }
+ return int(doubl);
+}
+
+template<> QDateTime requireIsType<QDateTime>(const QJsonValue &value, const QString &what)
+{
+ const QString string = requireIsType<QString>(value, 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 requireIsType<QUrl>(const QJsonValue &value, const QString &what)
+{
+ const QString string = ensureIsType<QString>(value, 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 requireIsType<QDir>(const QJsonValue &value, const QString &what)
+{
+ const QString string = requireIsType<QString>(value, what);
+ // FIXME: does not handle invalid characters!
+ return QDir::current().absoluteFilePath(string);
+}
+
+template<> QUuid requireIsType<QUuid>(const QJsonValue &value, const QString &what)
+{
+ const QString string = requireIsType<QString>(value, 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 requireIsType<QJsonObject>(const QJsonValue &value, const QString &what)
+{
+ if (!value.isObject())
+ {
+ throw JsonException(what + " is not an object");
+ }
+ return value.toObject();
+}
+
+template<> QVariant requireIsType<QVariant>(const QJsonValue &value, const QString &what)
+{
+ if (value.isNull() || value.isUndefined())
+ {
+ throw JsonException(what + " is null or undefined");
+ }
+ return value.toVariant();
+}
+
+template<> QJsonValue requireIsType<QJsonValue>(const QJsonValue &value, const QString &what)
+{
+ if (value.isNull() || value.isUndefined())
+ {
+ throw JsonException(what + " is null or undefined");
+ }
+ return value;
+}
+
+}