feat(app): implement Google Play App Licensing

Signed-off-by: YuutaW <17158086+Trumeet@users.noreply.github.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/app/src/main/java/moe/yuuta/gplicense/Policy.java b/app/src/main/java/moe/yuuta/gplicense/Policy.java
new file mode 100644
index 0000000..c261d82
--- /dev/null
+++ b/app/src/main/java/moe/yuuta/gplicense/Policy.java
@@ -0,0 +1,49 @@
+package moe.yuuta.gplicense;
+
+/**
+ * Policy used by {@link LicenseChecker} to determine whether a user should have
+ * access to the application.
+ */
+public interface Policy {
+
+    /**
+     * Change these values to make it more difficult for tools to automatically
+     * strip LVL protection from your APK.
+     */
+
+    /**
+     * LICENSED means that the server returned back a valid license response
+     */
+    int LICENSED = 0x0100;
+    /**
+     * NOT_LICENSED means that the server returned back a valid license response
+     * that indicated that the user definitively is not licensed
+     */
+    int NOT_LICENSED = 0x0231;
+    /**
+     * RETRY means that the license response was unable to be determined ---
+     * perhaps as a result of faulty networking
+     */
+    int RETRY = 0x0123;
+
+    /**
+     * Provide results from contact with the license server. Retry counts are
+     * incremented if the current value of response is RETRY. Results will be
+     * used for any future policy decisions.
+     *
+     * @param response the result from validating the server response
+     * @param rawData the raw server response data, can be null for RETRY
+     */
+    void processServerResponse(int response, ResponseData rawData);
+
+    /**
+     * Check if the user should be allowed access to the application.
+     */
+    boolean allowAccess();
+
+    /**
+     * Gets the licensing URL returned by the server that can enable access for unlicensed apps (e.g.
+     * buy app on the Play Store).
+     */
+    String getLicensingUrl();
+}
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