[Files] Support retrieve file content

Author: qianmoQ

docs/docs/reference/openai/files.md

@@ -114,3 +114,16 @@ Returns:
   "purpose": "fine-tune"
 }
 ```
+
+### Retrieve file content
+
+---
+
+Returns information about a specific file.
+
+```java
+String id = "file-XjGxS3KTG0uNmNOK362iJua3";
+this.client.retrieveFileContent(entity.getId());
+```
+
+Returns the original content of the uploaded file.

docs/docs/reference/openai/files.zh.md

@@ -114,3 +114,16 @@ this.client.retrieveFile(entity.getId());
   "purpose": "fine-tune"
 }
 ```
+
+### Retrieve file content
+
+---
+
+返回有关特定文件的信息。
+
+```java
+String id = "file-XjGxS3KTG0uNmNOK362iJua3";
+this.client.retrieveFileContent(entity.getId());
+```
+
+返回上传文件的原始内容。

src/main/java/org/devlive/sdk/openai/DefaultApi.java

@@ -165,4 +165,11 @@ Single<FileEntity> fetchUploadFile(@Url String url,
      */
     @GET
     Single<FileEntity> fetchRetrieveFile(@Url String url);
+
+    /**
+     * Returns the contents of the specified file
+     * 返回指定文件的内容
+     */
+    @GET
+    Single<Object> fetchRetrieveFileContent(@Url String url);
 }

src/main/java/org/devlive/sdk/openai/DefaultClient.java

@@ -161,6 +161,13 @@ public FileEntity retrieveFile(String id)
                 .blockingGet();
     }
 
+    public Object retrieveFileContent(String id)
+    {
+        String url = String.join("/", ProviderUtils.getUrl(provider, UrlModel.FETCH_FILES), id, "content");
+        return this.api.fetchRetrieveFileContent(url)
+                .blockingGet();
+    }
+
     public void close()
     {
         if (ObjectUtils.isNotEmpty(this.client)) {

src/test/java/org/devlive/sdk/openai/FileClientTest.java

@@ -50,4 +50,17 @@ public void testRetrieveFile()
 
         Assert.assertNotNull(this.client.retrieveFile(entity.getId()));
     }
+
+    @Test
+    public void testRetrieveFileContent()
+            throws InterruptedException
+    {
+        String file = this.getClass().getResource("/test.jsonl").getFile();
+        FileEntity entity = this.client.uploadFile(FileEntity.builder()
+                .file(new File(file))
+                .build());
+        Thread.sleep(3000);
+
+        Assert.assertNotNull(this.client.retrieveFileContent(entity.getId()));
+    }
 }