feat(app): implement Google Play App Licensing

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

1 files changed, 42 insertions, 0 deletions

diff --git a/app/src/main/java/moe/yuuta/gplicense/util/URIQueryDecoder.java b/app/src/main/java/moe/yuuta/gplicense/util/URIQueryDecoder.java
new file mode 100644
index 0000000..273e85f
--- /dev/null
+++ b/app/src/main/java/moe/yuuta/gplicense/util/URIQueryDecoder.java
@@ -0,0 +1,42 @@
+package moe.yuuta.gplicense.util;
+
+import com.elvishew.xlog.XLog;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URI;
+import java.net.URLDecoder;
+import java.util.Map;
+import java.util.Scanner;
+
+public class URIQueryDecoder {
+    /**
+     * Decodes the query portion of the passed-in URI.
+     *
+     * @param encodedURI the URI containing the query to decode
+     * @param results a map containing all query parameters. Query parameters that do not have a
+     *            value will map to a null string
+     */
+    static public void DecodeQuery(URI encodedURI, Map<String, String> results) {
+        Scanner scanner = new Scanner(encodedURI.getRawQuery());
+        scanner.useDelimiter("&");
+        try {
+            while (scanner.hasNext()) {
+                String param = scanner.next();
+                String[] valuePair = param.split("=");
+                String name, value;
+                if (valuePair.length == 1) {
+                    value = null;
+                } else if (valuePair.length == 2) {
+                    value = URLDecoder.decode(valuePair[1], "UTF-8");
+                } else {
+                    throw new IllegalArgumentException("query parameter invalid");
+                }
+                name = URLDecoder.decode(valuePair[0], "UTF-8");
+                results.put(name, value);
+            }
+        } catch (UnsupportedEncodingException e) {
+            // This should never happen.
+            XLog.e("UQD", "UTF-8 Not Recognized as a charset.  Device configuration Error.");
+        }
+    }
+}