Migrate currency converter endpoints (#524)

We are migrating the REST endpoint that Currency Converter uses. The REST endpoint is not licensed for your use. To continue to enable community participation in the development of the feature, developer builds will use an alternate REST endpoint that serves mock data (clearly identifiable as it references planets instead of countries).

.gitignore

@@ -290,6 +290,7 @@ __pycache__/
 # Calculator specific
 Generated Files/
 src/GraphControl/GraphingImplOverrides.props
+src/CalcViewModel/DataLoaders/DataLoaderConstants.h
 !/build/config/TRexDefs/**
 !src/Calculator/TemporaryKey.pfx
 !src/CalculatorUnitTests/CalculatorUnitTests_TemporaryKey.pfx

README.md

@@ -54,6 +54,12 @@ Read our [privacy statement](https://go.microsoft.com/fwlink/?LinkId=521839) to
 Telemetry is disabled in development builds by default, and can be enabled with the `SEND_TELEMETRY`
 build flag.
 
+## Currency Converter
+Windows Calculator includes a currency converter feature that uses mock data in developer builds. The data that 
+Microsoft uses for the currency converter feature (e.g., in the retail version of the application) is not licensed 
+for your use. The mock data will be clearly identifiable as it references planets instead of countries, 
+and remains static regardless of selected inputs.
+
 ## Reporting Security Issues
 Security issues and bugs should be reported privately, via email, to the
 Microsoft Security Response Center (MSRC) at <[secure@microsoft.com](mailto:secure@microsoft.com)>.

src/CalcViewModel/CalcViewModel.vcxproj

@@ -408,6 +408,23 @@
       <Project>{311e866d-8b93-4609-a691-265941fee101}</Project>
     </ProjectReference>
   </ItemGroup>
+  <ItemDefinitionGroup Condition="!Exists('DataLoaders\DataLoaderConstants.h')">
+    <ClCompile>
+      <AdditionalOptions>/DUSE_MOCK_DATA %(AdditionalOptions)</AdditionalOptions>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <Choose>
+	<When Condition="Exists('DataLoaders\DataLoaderConstants.h')">
+	  <ItemGroup>
+		<ClInclude Include="DataLoaders\DataLoaderConstants.h" />
+	  </ItemGroup>
+	</When>
+	<Otherwise>
+	  <ItemGroup>
+		<ClInclude Include="DataLoaders\DataLoaderMockConstants.h" />
+	  </ItemGroup>
+	</Otherwise>
+  </Choose>
   <ItemGroup>
     <None Include="DataLoaders\DefaultFromToCurrency.json" />
     <None Include="packages.config" />

src/CalcViewModel/CalcViewModel.vcxproj.filters

@@ -213,6 +213,12 @@
     <ClInclude Include="Common\TraceActivity.h">
       <Filter>Common</Filter>
     </ClInclude>
+    <ClInclude Include="DataLoaders\DataLoaderMockConstants.h">
+      <Filter>DataLoaders</Filter>
+    </ClInclude>
+    <ClInclude Include="DataLoaders\DataLoaderConstants.h">
+      <Filter>DataLoaders</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="DataLoaders\DefaultFromToCurrency.json">

src/CalcViewModel/DataLoaders/CurrencyDataLoader.cpp

@@ -644,6 +644,23 @@ void CurrencyDataLoader::GuaranteeSelectedUnits()
             isConversionTargetSet = true;
         }
     }
+
+    // If still not set for either source or target, just select the first currency in the list
+
+    if (!m_currencyUnits.empty())
+    {
+        if (!isConversionSourceSet)
+        {
+            m_currencyUnits[0].isConversionSource = true;
+            isConversionSourceSet = true;
+        }
+
+        if (!isConversionTargetSet)
+        {
+            m_currencyUnits[0].isConversionTarget = true;
+            isConversionTargetSet = true;
+        }
+    }
 }
 
 void CurrencyDataLoader::NotifyDataLoadFinished(bool didLoad)

src/CalcViewModel/DataLoaders/CurrencyHttpClient.cpp

@@ -1,18 +1,21 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 #include "pch.h"
 #include "CurrencyHttpClient.h"
 
+#ifdef USE_MOCK_DATA
+#include "DataLoaderMockConstants.h"
+#else
+#include "DataLoaderConstants.h"
+#endif
+
 using namespace CalculatorApp::DataLoaders;
 using namespace Platform;
 using namespace std;
 using namespace Windows::Foundation;
 using namespace Windows::Web::Http;
 
-static constexpr auto sc_MetadataUriLocalizeFor = L"https://go.microsoft.com/fwlink/?linkid=2041093&localizeFor=";
-static constexpr auto sc_RatiosUriRelativeTo = L"https://go.microsoft.com/fwlink/?linkid=2041339&localCurrency=";
-
 CurrencyHttpClient::CurrencyHttpClient()
     : m_client(ref new HttpClient())
     , m_responseLanguage(L"en-US")

src/CalcViewModel/DataLoaders/DataLoaderMockConstants.h

@@ -0,0 +1,13 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#pragma once
+
+namespace CalculatorApp
+{
+    namespace DataLoaders
+    {
+        static constexpr auto sc_MetadataUriLocalizeFor = L"https://go.microsoft.com/fwlink/?linkid=2091028&localizeFor=";
+        static constexpr auto sc_RatiosUriRelativeTo = L"https://go.microsoft.com/fwlink/?linkid=2091307&localCurrency=";
+    }
+}