add option to pass API basepath

Author: Zdravko Bozakov

README.md

@@ -27,6 +27,7 @@ or when [running the docker image](#using-the-ready-made-docker-image) or when c
 | MATTERMOST_URL       | yes      | `https://mattermost.server`  | The URL to the server. This is used for connecting the bot to the Mattermost API                                                                                                                   |
 | MATTERMOST_TOKEN     | yes      | `abababacdcdcd`              | The authentication token from the logged in mattermost bot                                                                                                                                         |
 | OPENAI_API_KEY       | yes      | `sk-234234234234234234`      | The OpenAI API key to authenticate with OpenAI                                                                                                                                                     |
+| OPENAI_API_BASE      | no       | `http://example.com:8080/v1` | The address of an OpenAI compatible API. Overrides the default base path (`https://api.openai.com`)          |
 | OPENAI_MODEL_NAME    | no       | `gpt-3.5-turbo`              | The OpenAI language model to use, defaults to `gpt-3.5-turbo`                                                                                                                                      |
 | OPENAI_MAX_TOKENS    | no       | `2000`                       | The maximum number of tokens to pass to the OpenAI API, defaults to 2000                                                                                                                           |
 | OPENAI_TEMPERATURE   | no       | `0.2`                        | The sampling temperature to use, between 0 and 2, defaults to 1. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic. |

src/openai-wrapper.ts

@@ -11,9 +11,10 @@ import {PluginBase} from "./plugins/PluginBase";
 import {AiResponse, MessageData} from "./types";
 
 const apiKey = process.env['OPENAI_API_KEY'];
-log.trace({apiKey})
+const basePath = process.env['OPENAI_API_BASE'];
+log.trace({apiKey, basePath})
 
-const configuration = new Configuration({ apiKey })
+const configuration = new Configuration({ apiKey, basePath })
 
 const openai = new OpenAIApi(configuration)