[libcalamares] Implement Handler's synchronous query()

- Steal code from existing tests for a synchronous HTTP get,
   then hand it off to the handler.
 - Extend tests with Handler interpreting the same data.

src/libcalamares/geoip/GeoIPTests.cpp

@@ -22,6 +22,7 @@
 #ifdef QT_XML_LIB
 #include "GeoIPXML.h"
 #endif
+#include "Handler.h"
 
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
@@ -219,14 +220,18 @@ synchronous_get( const char* urlstring )
 #define CHECK_GET(t, selector, url) \
     { \
         auto tz = GeoIP##t( selector ).processReply( synchronous_get( url ) ); \
+        qDebug() << tz; \
         QCOMPARE( default_tz, tz ); \
+        auto tz2 = CalamaresUtils::GeoIP::Handler( ""#t, url, selector ).query(); \
+        qDebug() << tz2; \
+        QCOMPARE( default_tz, tz2 ); \
     }
 
 void GeoIPTests::testGet()
 {
     if ( !QProcessEnvironment::systemEnvironment().contains( QStringLiteral("TEST_HTTP_GET") ) )
     {
-        qDebug() << "Skipping HTTP GET tests";
+        qDebug() << "Skipping HTTP GET tests, set TEST_HTTP_GET environment variable to enable";
         return;
     }
 

src/libcalamares/geoip/Handler.cpp

@@ -18,23 +18,80 @@
 
 #include "Handler.h"
 
+#include "GeoIPJSON.h"
+#if defined(QT_XML_LIB)
+#include "GeoIPXML.h"
+#endif
+
+#include "utils/Logger.h"
+
+#include <QEventLoop>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+
 namespace CalamaresUtils::GeoIP
 {
 
 Handler::Handler()
+    : m_interface( nullptr )
 {
 }
 
+Handler::Handler( const QString& implementation, const QString& url, const QString& selector )
+    : m_interface( nullptr )
+    , m_url( url )
+{
+    if ( implementation.compare( "json", Qt::CaseInsensitive ) == 0 )
+    {
+        m_interface = new GeoIPJSON( selector );
+    }
+#if defined(QT_XML_LIB)
+    else if ( implementation.compare( "xml", Qt::CaseInsensitive ) == 0 )
+    {
+        m_interface = new GeoIPXML( selector );
+    }
+#endif
+    else
+    {
+        cWarning() << "GeoIP Style" << implementation << "is not recognized.";
+    }
+}
+
+Handler::~Handler()
+{
+    delete m_interface;
+}
+
 bool
 Handler::isValid() const
 {
-    return false;
+    return m_interface;
 }
 
+static QByteArray
+synchronous_get( const QString& urlstring )
+{
+    QUrl url( urlstring );
+    QNetworkAccessManager manager;
+    QEventLoop loop;
+
+    QObject::connect( &manager, &QNetworkAccessManager::finished, &loop, &QEventLoop::quit );
+
+    QNetworkRequest request( url );
+    QNetworkReply* reply = manager.get( request );
+    loop.exec();
+    reply->deleteLater();
+    return reply->readAll();
+}
+
+
 RegionZonePair
 Handler::query() const
 {
-    return RegionZonePair();
+    if ( !isValid() )
+        return RegionZonePair();
+
+    return m_interface->processReply( synchronous_get( m_url ) );
 }
 
 }  // namespace

src/libcalamares/geoip/Handler.h

@@ -21,6 +21,9 @@
 
 #include "Interface.h"
 
+#include <QString>
+#include <QVariantMap>
+
 namespace CalamaresUtils {}
 namespace CalamaresUtils::GeoIP
 {
@@ -37,10 +40,36 @@ class DLLEXPORT Handler
 public:
     /** @brief An unconfigured handler; this always returns errors. */
     Handler();
+    /** @brief A handler for a specific GeoIP source.
+     *
+     * The @p implementation name selects an implementation; currently JSON and XML
+     * are supported. The @p url is retrieved by query() and then the @p selector
+     * is used to select something from the data returned by the @url.
+     */
+    Handler( const QString& implementation, const QString& url, const QString& selector );
+    /** @brief A handler for a specific GeoIP source.
+     *
+     * This is like the 3-QString Handler constructor, except the strings
+     * are extracted from the map, which is typically part of the configuration
+     * of a Calamares module. The strings are fetched from these keys:
+     *  - implementation from "style" or "geoipStyle" (if the first does not exist)
+     *  - url from "url" or "geoipUrl" (if the first does not exist)
+     *  - selector from "selector" or "geoipSelector" (if the first does not exist)
+     * Unlike the 3-QString Handler constructor, this also understands implementations
+     * "legacy" and blank, which are interpreted as "JSON", except that the url is extended
+     * by "/json/" before fetching.
+     */
+    Handler( const QVariantMap& config );
+
+    ~Handler();
 
     RegionZonePair query() const;
 
     bool isValid() const;
+
+private:
+    Interface* m_interface;
+    const QString m_url;
 };
 
 }  // namespace