chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
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+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+using System.Collections.Generic;
+
+namespace QuantConnect.Interfaces
+{
+    /// <summary>
+    /// Wrapper on the API for downloading data for an algorithm.
+    /// </summary>
+    public interface IDownloadProvider
+    {
+        /// <summary>
+        /// Method for downloading data for an algorithm
+        /// </summary>
+        /// <param name="address">Source URL to download from</param>
+        /// <param name="headers">Headers to pass to the site</param>
+        /// <param name="userName">Username for basic authentication</param>
+        /// <param name="password">Password for basic authentication</param>
+        /// <returns>String contents of file</returns>
+        string Download(string address, IEnumerable<KeyValuePair<string, string>> headers, string userName, string password);
+
+        /// <summary>
+        /// Method for downloading data for an algorithm that can be read from a stream
+        /// </summary>
+        /// <param name="address">Source URL to download from</param>
+        /// <param name="headers">Headers to pass to the site</param>
+        /// <param name="userName">Username for basic authentication</param>
+        /// <param name="password">Password for basic authentication</param>
+        /// <returns>String contents of file</returns>
+        byte[] DownloadBytes(string address, IEnumerable<KeyValuePair<string, string>> headers, string userName, string password);
+    }
+}