Prompt ChatGPT ports

dart/prompt_chatgpt/.gitignore

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+# See https://www.dartlang.org/guides/libraries/private-files
+
+# Files and directories created by pub
+.dart_tool/
+.packages
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/
+
+# dotenv environment variables file
+.env*
+
+# Avoid committing generated Javascript files:
+*.dart.js
+*.info.json      # Produced by the --dump-info flag.
+*.js             # When generated by dart2js. Don't specify *.js if your
+                 # project includes source files written in JavaScript.
+*.js_
+*.js.deps
+*.js.map
+
+.flutter-plugins
+.flutter-plugins-dependencies

dart/prompt_chatgpt/README.md

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+# 🤖 Dart Prompt ChatGPT Function
+
+Ask question, and let OpenAI GPT-3.5-turbo answer.
+
+## 🧰 Usage
+
+### `GET`
+
+HTML form for interacting with the function.
+
+### `POST`
+
+Query the model for a completion.
+
+**Parameters**
+
+| Name         | Description                          | Location | Type               | Sample Value                  |
+| ------------ | ------------------------------------ | -------- | ------------------ | ----------------------------- |
+| Content-Type | The content type of the request body | Header   | `application/json` | N/A                           |
+| prompt       | Text to prompt the model             | Body     | String             | `Write a haiku about Mondays` |
+
+Sample `200` Response:
+
+Response from the model.
+
+```json
+{
+  "ok": true,
+  "completion": "Monday's heavy weight, Dawning with a sigh of grey, Hopeful hearts await."
+}
+```
+
+Sample `400` Response:
+
+Response when the request body is missing.
+
+```json
+{
+  "ok": false,
+  "error": "Missing body with a prompt."
+}
+```
+
+Sample `500` Response:
+
+Response when the model fails to respond.
+
+```json
+{
+  "ok": false,
+  "error": "Failed to query model."
+}
+```
+
+## ⚙️ Configuration
+
+| Setting           | Value           |
+| ----------------- | --------------- |
+| Runtime           | Dart (2.17)     |
+| Entrypoint        | `lib/main.dart` |
+| Build Commands    | `dart pub get`  |
+| Permissions       | `any`           |
+| Timeout (Seconds) | 15              |
+
+## 🔒 Environment Variables
+
+### OPENAI_API_KEY
+
+A unique key used to authenticate with the OpenAI API. Please note that this is a paid service and you will be charged for each request made to the API. For more information, see the [OpenAI pricing page](https://openai.com/pricing/).
+
+| Question      | Answer                                                                      |
+| ------------- | --------------------------------------------------------------------------- |
+| Required      | Yes                                                                         |
+| Sample Value  | `sk-wzG...vcy`                                                              |
+| Documentation | [OpenAI Docs](https://platform.openai.com/docs/quickstart/add-your-api-key) |
+
+### OPENAI_MAX_TOKENS
+
+The maximum number of tokens that the OpenAI response should contain. Be aware that OpenAI models read and write a maximum number of tokens per API call, which varies depending on the model. For GPT-3.5-turbo, the limit is 4096 tokens.
+
+| Question      | Answer                                                                                                        |
+| ------------- | ------------------------------------------------------------------------------------------------------------- |
+| Required      | No                                                                                                            |
+| Sample Value  | `512`                                                                                                         |
+| Documentation | [OpenAI: What are tokens?](https://help.openai.com/en/articles/4936856-what-are-tokens-and-how-to-count-them) |

dart/prompt_chatgpt/analysis_options.yaml

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+include: package:lints/recommended.yaml

dart/prompt_chatgpt/lib/main.dart

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+import 'dart:io';
+import 'dart:async';
+import 'package:dart_openai/dart_openai.dart';
+import 'utils.dart';
+
+Future<dynamic> main(final context) async {
+  throwIfMissing(Platform.environment, ['OPENAI_API_KEY']);
+
+  if (context.req.method == 'GET') {
+    return context.res.send(getStaticFile('index.html'), 200,
+        {'Content-Type': 'text/html; charset=utf-8'});
+  }
+
+  try {
+    throwIfMissing(context.req.body, ['prompt']);
+  } catch (err) {
+    return context.res.json({'ok': false, 'error': err.toString()});
+  }
+
+  OpenAI.apiKey = Platform.environment['OPENAI_API_KEY']!;
+
+  try {
+    final response = await OpenAI.instance.chat.create(
+      model: 'gpt-3.5-turbo',
+      maxTokens: int.parse(Platform.environment['OPENAI_MAX_TOKENS'] ?? '512'),
+      messages: [
+        OpenAIChatCompletionChoiceMessageModel(
+            content: context.req.body['prompt'],
+            role: OpenAIChatMessageRole.user)
+      ],
+    );
+
+    final completion = response.choices[0].message.content;
+
+    return context.res.json({'ok': true, 'completion': completion}, 200);
+  } on RequestFailedException {
+    return context.res
+        .json({'ok': false, 'error': 'Failed to query model.'}, 500);
+  }
+}

dart/prompt_chatgpt/lib/utils.dart

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+import 'dart:io';
+
+/// Throws an error if any of the keys are missing from the object
+/// @param obj - The object to check
+/// @param keys - The list of keys to check for
+/// @throws Exception
+void throwIfMissing(Map<String, dynamic> obj, List<String> keys) {
+  final missing = <String>[];
+  for (var key in keys) {
+    if (!obj.containsKey(key) || obj[key] == null) {
+      missing.add(key);
+    }
+  }
+  if (missing.isNotEmpty) {
+    throw Exception('Missing required fields: ${missing.join(', ')}');
+  }
+}
+
+final String _dirname = Platform.script.toFilePath();
+final String staticFolder = '${Uri.file(_dirname).resolve('../static')}';
+
+/// Returns the contents of a file in the static folder
+/// @param fileName - The name of the file to read
+/// @returns Contents of static/{fileName}
+String getStaticFile(String fileName) {
+  return File('${staticFolder}/$fileName').readAsStringSync();
+}

dart/prompt_chatgpt/pubspec.yaml

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+name: prompt_chatgpt
+version: 1.0.0
+
+environment:
+  sdk: ^2.17.0
+
+dependencies:
+  dart_openai: ^3.0.0
+
+dev_dependencies:
+  lints: ^2.0.0