Add UrlHelper.kt

app/src/main/java/chat/rocket/android/helper/UrlHelper.kt

+package chat.rocket.android.helper
+
+object UrlHelper {
+
+    /**
+     * Returns an URI whit no scheme (HTTP or HTTPS)
+     *
+     * @param uri The URI.
+     * @return The URI whit no scheme (HTTP or HTTPS)
+     */
+    fun removeUriScheme(uri: String) = uri.replace("http://", "").replace("https://", "")
+
+    /**
+     * Returns the hostname with the security protocol (scheme) HTTPS.
+     *
+     * @param hostname The hostname.
+     * @return The hostname with the security protocol (scheme) HTTPS.
+     */
+    fun getSafeHostname(hostname: String): String =
+        "https://" + hostname.replace("http://", "").replace("https://", "")
+
+    /**
+     * Returns an URL with no spaces and inverted slashes.
+     *
+     * @param url The URL.
+     * @return The URL with no spaces and inverted slashes.
+     */
+    fun getUrl(url: String) =
+            url.replace(" ", "%20").replace("\\", "")
+
+    /**
+     * Returns an URL for a file.
+     *
+     * @param path The path to the file.
+     * @param userId The user ID.
+     * @param token The token.
+     * @return The URL for a file
+     */
+    fun getUrlForFile(path: String, userId: String, token: String): String =
+            "https://" + removeUriScheme(getUrl(path)) + "?rc_uid=$userId" + "&rc_token=$token"
+}
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