7 files changed, 194 insertions, 40 deletions

diff --git a/src/web_service/CMakeLists.txt b/src/web_service/CMakeLists.txt
index 334d82a8a..c93811892 100644
--- a/src/web_service/CMakeLists.txt
+++ b/src/web_service/CMakeLists.txt
@@ -1,10 +1,12 @@
 set(SRCS
             telemetry_json.cpp
+            verify_login.cpp
             web_backend.cpp
             )
 
 set(HEADERS
             telemetry_json.h
+            verify_login.h
             web_backend.h
             )
 
diff --git a/src/web_service/telemetry_json.cpp b/src/web_service/telemetry_json.cpp
index a2d007e77..6ad2ffcd4 100644
--- a/src/web_service/telemetry_json.cpp
+++ b/src/web_service/telemetry_json.cpp
@@ -3,7 +3,6 @@
 // Refer to the license.txt file included.
 
 #include "common/assert.h"
-#include "core/settings.h"
 #include "web_service/telemetry_json.h"
 #include "web_service/web_backend.h"
 
@@ -81,7 +80,7 @@ void TelemetryJson::Complete() {
     SerializeSection(Telemetry::FieldType::UserFeedback, "UserFeedback");
     SerializeSection(Telemetry::FieldType::UserConfig, "UserConfig");
     SerializeSection(Telemetry::FieldType::UserSystem, "UserSystem");
-    PostJson(Settings::values.telemetry_endpoint_url, TopSection().dump());
+    PostJson(endpoint_url, TopSection().dump(), true, username, token);
 }
 
 } // namespace WebService
diff --git a/src/web_service/telemetry_json.h b/src/web_service/telemetry_json.h
index 39038b4f9..9e78c6803 100644
--- a/src/web_service/telemetry_json.h
+++ b/src/web_service/telemetry_json.h
@@ -17,7 +17,9 @@ namespace WebService {
  */
 class TelemetryJson : public Telemetry::VisitorInterface {
 public:
-    TelemetryJson() = default;
+    TelemetryJson(const std::string& endpoint_url, const std::string& username,
+                  const std::string& token)
+        : endpoint_url(endpoint_url), username(username), token(token) {}
     ~TelemetryJson() = default;
 
     void Visit(const Telemetry::Field<bool>& field) override;
@@ -49,6 +51,9 @@ private:
 
     nlohmann::json output;
     std::array<nlohmann::json, 7> sections;
+    std::string endpoint_url;
+    std::string username;
+    std::string token;
 };
 
 } // namespace WebService
diff --git a/src/web_service/verify_login.cpp b/src/web_service/verify_login.cpp
new file mode 100644
index 000000000..1bc3b5afe
--- /dev/null
+++ b/src/web_service/verify_login.cpp
@@ -0,0 +1,28 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <json.hpp>
+#include "web_service/verify_login.h"
+#include "web_service/web_backend.h"
+
+namespace WebService {
+
+std::future<bool> VerifyLogin(std::string& username, std::string& token,
+                              const std::string& endpoint_url, std::function<void()> func) {
+    auto get_func = [func, username](const std::string& reply) -> bool {
+        func();
+        if (reply.empty())
+            return false;
+        nlohmann::json json = nlohmann::json::parse(reply);
+        std::string result;
+        try {
+            result = json["username"];
+        } catch (const nlohmann::detail::out_of_range&) {
+        }
+        return result == username;
+    };
+    return GetJson<bool>(get_func, endpoint_url, false, username, token);
+}
+
+} // namespace WebService
diff --git a/src/web_service/verify_login.h b/src/web_service/verify_login.h
new file mode 100644
index 000000000..303f5dbbc
--- /dev/null
+++ b/src/web_service/verify_login.h
@@ -0,0 +1,24 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <future>
+#include <string>
+
+namespace WebService {
+
+/**
+ * Checks if username and token is valid
+ * @param username Citra username to use for authentication.
+ * @param token Citra token to use for authentication.
+ * @param endpoint_url URL of the services.citra-emu.org endpoint.
+ * @param func A function that gets exectued when the verification is finished
+ * @returns Future with bool indicating whether the verification succeeded
+ */
+std::future<bool> VerifyLogin(std::string& username, std::string& token,
+                              const std::string& endpoint_url, std::function<void()> func);
+
+} // namespace WebService
diff --git a/src/web_service/web_backend.cpp b/src/web_service/web_backend.cpp
index 13e4555ac..b17d82f9c 100644
--- a/src/web_service/web_backend.cpp
+++ b/src/web_service/web_backend.cpp
@@ -2,51 +2,139 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#ifdef _WIN32
+#include <winsock.h>
+#endif
+
+#include <cstdlib>
+#include <thread>
 #include <cpr/cpr.h>
-#include <stdlib.h>
 #include "common/logging/log.h"
 #include "web_service/web_backend.h"
 
 namespace WebService {
 
 static constexpr char API_VERSION[]{"1"};
-static constexpr char ENV_VAR_USERNAME[]{"CITRA_WEB_SERVICES_USERNAME"};
-static constexpr char ENV_VAR_TOKEN[]{"CITRA_WEB_SERVICES_TOKEN"};
 
-static std::string GetEnvironmentVariable(const char* name) {
-    const char* value{getenv(name)};
-    if (value) {
-        return value;
+static std::unique_ptr<cpr::Session> g_session;
+
+void Win32WSAStartup() {
+#ifdef _WIN32
+    // On Windows, CPR/libcurl does not properly initialize Winsock. The below code is used to
+    // initialize Winsock globally, which fixes this problem. Without this, only the first CPR
+    // session will properly be created, and subsequent ones will fail.
+    WSADATA wsa_data;
+    const int wsa_result{WSAStartup(MAKEWORD(2, 2), &wsa_data)};
+    if (wsa_result) {
+        LOG_CRITICAL(WebService, "WSAStartup failed: %d", wsa_result);
     }
-    return {};
+#endif
 }
 
-const std::string& GetUsername() {
-    static const std::string username{GetEnvironmentVariable(ENV_VAR_USERNAME)};
-    return username;
-}
+void PostJson(const std::string& url, const std::string& data, bool allow_anonymous,
+              const std::string& username, const std::string& token) {
+    if (url.empty()) {
+        LOG_ERROR(WebService, "URL is invalid");
+        return;
+    }
+
+    const bool are_credentials_provided{!token.empty() && !username.empty()};
+    if (!allow_anonymous && !are_credentials_provided) {
+        LOG_ERROR(WebService, "Credentials must be provided for authenticated requests");
+        return;
+    }
 
-const std::string& GetToken() {
-    static const std::string token{GetEnvironmentVariable(ENV_VAR_TOKEN)};
-    return token;
+    Win32WSAStartup();
+
+    // Built request header
+    cpr::Header header;
+    if (are_credentials_provided) {
+        // Authenticated request if credentials are provided
+        header = {{"Content-Type", "application/json"},
+                  {"x-username", username.c_str()},
+                  {"x-token", token.c_str()},
+                  {"api-version", API_VERSION}};
+    } else {
+        // Otherwise, anonymous request
+        header = cpr::Header{{"Content-Type", "application/json"}, {"api-version", API_VERSION}};
+    }
+
+    // Post JSON asynchronously
+    static std::future<void> future;
+    future = cpr::PostCallback(
+        [](cpr::Response r) {
+            if (r.error) {
+                LOG_ERROR(WebService, "POST returned cpr error: %u:%s",
+                          static_cast<u32>(r.error.code), r.error.message.c_str());
+                return;
+            }
+            if (r.status_code >= 400) {
+                LOG_ERROR(WebService, "POST returned error status code: %u", r.status_code);
+                return;
+            }
+            if (r.header["content-type"].find("application/json") == std::string::npos) {
+                LOG_ERROR(WebService, "POST returned wrong content: %s",
+                          r.header["content-type"].c_str());
+                return;
+            }
+        },
+        cpr::Url{url}, cpr::Body{data}, header);
 }
 
-void PostJson(const std::string& url, const std::string& data) {
+template <typename T>
+std::future<T> GetJson(std::function<T(const std::string&)> func, const std::string& url,
+                       bool allow_anonymous, const std::string& username,
+                       const std::string& token) {
     if (url.empty()) {
         LOG_ERROR(WebService, "URL is invalid");
-        return;
+        return std::async(std::launch::async, [func{std::move(func)}]() { return func(""); });
     }
 
-    if (GetUsername().empty() || GetToken().empty()) {
-        LOG_ERROR(WebService, "Environment variables %s and %s must be set to POST JSON",
-                  ENV_VAR_USERNAME, ENV_VAR_TOKEN);
-        return;
+    const bool are_credentials_provided{!token.empty() && !username.empty()};
+    if (!allow_anonymous && !are_credentials_provided) {
+        LOG_ERROR(WebService, "Credentials must be provided for authenticated requests");
+        return std::async(std::launch::async, [func{std::move(func)}]() { return func(""); });
     }
 
-    cpr::PostAsync(cpr::Url{url}, cpr::Body{data}, cpr::Header{{"Content-Type", "application/json"},
-                                                               {"x-username", GetUsername()},
-                                                               {"x-token", GetToken()},
-                                                               {"api-version", API_VERSION}});
+    Win32WSAStartup();
+
+    // Built request header
+    cpr::Header header;
+    if (are_credentials_provided) {
+        // Authenticated request if credentials are provided
+        header = {{"Content-Type", "application/json"},
+                  {"x-username", username.c_str()},
+                  {"x-token", token.c_str()},
+                  {"api-version", API_VERSION}};
+    } else {
+        // Otherwise, anonymous request
+        header = cpr::Header{{"Content-Type", "application/json"}, {"api-version", API_VERSION}};
+    }
+
+    // Get JSON asynchronously
+    return cpr::GetCallback(
+        [func{std::move(func)}](cpr::Response r) {
+            if (r.error) {
+                LOG_ERROR(WebService, "GET returned cpr error: %u:%s",
+                          static_cast<u32>(r.error.code), r.error.message.c_str());
+                return func("");
+            }
+            if (r.status_code >= 400) {
+                LOG_ERROR(WebService, "GET returned error code: %u", r.status_code);
+                return func("");
+            }
+            if (r.header["content-type"].find("application/json") == std::string::npos) {
+                LOG_ERROR(WebService, "GET returned wrong content: %s",
+                          r.header["content-type"].c_str());
+                return func("");
+            }
+            return func(r.text);
+        },
+        cpr::Url{url}, header);
 }
 
+template std::future<bool> GetJson(std::function<bool(const std::string&)> func,
+                                   const std::string& url, bool allow_anonymous,
+                                   const std::string& username, const std::string& token);
+
 } // namespace WebService
diff --git a/src/web_service/web_backend.h b/src/web_service/web_backend.h
index 2753d3b68..a63c75d13 100644
--- a/src/web_service/web_backend.h
+++ b/src/web_service/web_backend.h
@@ -4,28 +4,36 @@
 
 #pragma once
 
+#include <functional>
+#include <future>
 #include <string>
 #include "common/common_types.h"
 
 namespace WebService {
 
 /**
- * Gets the current username for accessing services.citra-emu.org.
- * @returns Username as a string, empty if not set.
- */
-const std::string& GetUsername();
-
-/**
- * Gets the current token for accessing services.citra-emu.org.
- * @returns Token as a string, empty if not set.
+ * Posts JSON to services.citra-emu.org.
+ * @param url URL of the services.citra-emu.org endpoint to post data to.
+ * @param data String of JSON data to use for the body of the POST request.
+ * @param allow_anonymous If true, allow anonymous unauthenticated requests.
+ * @param username Citra username to use for authentication.
+ * @param token Citra token to use for authentication.
  */
-const std::string& GetToken();
+void PostJson(const std::string& url, const std::string& data, bool allow_anonymous,
+              const std::string& username = {}, const std::string& token = {});
 
 /**
- * Posts JSON to services.citra-emu.org.
+ * Gets JSON from services.citra-emu.org.
+ * @param func A function that gets exectued when the json as a string is received
  * @param url URL of the services.citra-emu.org endpoint to post data to.
- * @param data String of JSON data to use for the body of the POST request.
+ * @param allow_anonymous If true, allow anonymous unauthenticated requests.
+ * @param username Citra username to use for authentication.
+ * @param token Citra token to use for authentication.
+ * @return future that holds the return value T of the func
  */
-void PostJson(const std::string& url, const std::string& data);
+template <typename T>
+std::future<T> GetJson(std::function<T(const std::string&)> func, const std::string& url,
+                       bool allow_anonymous, const std::string& username = {},
+                       const std::string& token = {});
 
 } // namespace WebService