add d1kt SSO integration: OAuth2 login via WebView + phone binding

android/oral-trainer-sdk/src/main/java/cn/learningpad/oraltrainer/sdk/UserApi.kt

@@ -109,6 +109,24 @@ class UserApi internal constructor(
         onComplete: (Result<AuthSession>) -> Unit,
     ): CancellableRequest = submit(onComplete) { requestBlocking("api/v1/auth/login", username, password, auth = false) }
 
+    fun ssoExchange(
+        accessToken: String,
+        onComplete: (Result<SsoExchangeResult>) -> Unit,
+    ): CancellableRequest = submit(onComplete) {
+        val root = JSONObject().put("access_token", accessToken)
+        val response = request("api/v1/auth/sso/exchange", body = root.toString(), method = "POST")
+        parseSsoExchangeResult(JSONObject(response))
+    }
+
+    fun ssoBindPhone(
+        token: String,
+        phone: String,
+        onComplete: (Result<Unit>) -> Unit,
+    ): CancellableRequest = submitUnit(onComplete, token) {
+        val root = JSONObject().put("phone", phone)
+        request("api/v1/auth/sso/bind-phone", token = token, body = root.toString(), method = "POST")
+    }
+
     fun courses(
         token: String,
         onComplete: (Result<List<Course>>) -> Unit,
@@ -279,4 +297,25 @@ class UserApi internal constructor(
             ),
         )
     }
+
+    private fun parseSsoExchangeResult(root: JSONObject): SsoExchangeResult {
+        val user = root.getJSONObject("user")
+        return SsoExchangeResult(
+            token = root.getString("token"),
+            user = AuthUser(
+                id = user.getString("id"),
+                username = user.getString("username"),
+                nickname = user.getString("nickname"),
+            ),
+            phoneBound = root.optBoolean("phone_bound", false),
+            isNewUser = root.optBoolean("is_new_user", false),
+        )
+    }
 }
+
+data class SsoExchangeResult(
+    val token: String,
+    val user: AuthUser,
+    val phoneBound: Boolean,
+    val isNewUser: Boolean,
+)