Allow to override File API URL (#143)

Author: vitalyster

library/src/main/java/com/pengrad/telegrambot/TelegramBot.java

@@ -75,12 +75,13 @@ public static final class Builder {
         static final String API_URL = "https://api.telegram.org/bot";
 
         private final String botToken;
-        private final FileApi fileApi;
+        private FileApi fileApi;
         private TelegramBotClient api;
         private UpdatesHandler updatesHandler;
 
         private OkHttpClient okHttpClient;
         private String apiUrl;
+        private String fileApiUrl;
 
         public Builder(String botToken) {
             this.botToken = botToken;
@@ -104,6 +105,11 @@ public Builder apiUrl(String apiUrl) {
             return this;
         }
 
+        public Builder fileApiUrl(String fileApiUrl) {
+            this.fileApiUrl = fileApiUrl;
+            return this;
+        }
+
         public Builder updateListenerSleep(long millis) {
             updatesHandler = new UpdatesHandler(millis);
             return this;
@@ -115,6 +121,9 @@ public TelegramBot build() {
                 String baseUrl = apiUrl(apiUrl != null ? apiUrl : API_URL, botToken);
                 api = new TelegramBotClient(client, gson(), baseUrl);
             }
+            if (fileApiUrl != null) {
+                fileApi = new FileApi(fileApiUrl, botToken);
+            }
             return new TelegramBot(this);
         }
 

library/src/main/java/com/pengrad/telegrambot/impl/FileApi.java

@@ -17,6 +17,10 @@ public FileApi(String token) {
         this.apiUrl = FILE_API + token + "/";
     }
 
+    public FileApi(String apiUrl, String token) {
+        this.apiUrl = apiUrl + token + "/";
+    }
+
     public String getFullFilePath(String filePath) {
         int slash = filePath.lastIndexOf('/') + 1;
         String path = filePath.substring(0, slash);