👮feat: moderation text (#1388)

* fixed some bugs and handling errors better

* feat: plugins support

* fix: prettier error message

* moved circular-json-es6 in /api

* docs: added openai moderation text

* fix(gptPlugins): incorrect merge

* discarding changes

* removed circular-json-es6

api/server/middleware/moderateText.js

@@ -0,0 +1,39 @@
+const axios = require('axios');
+const denyRequest = require('./denyRequest');
+
+async function moderateText(req, res, next) {
+  if (process.env.OPENAI_MODERATION === 'true') {
+    try {
+      const { text } = req.body;
+
+      const response = await axios.post(
+        process.env.OPENAI_MODERATION_REVERSE_PROXY || 'https://api.openai.com/v1/moderations',
+        {
+          input: text,
+        },
+        {
+          headers: {
+            'Content-Type': 'application/json',
+            Authorization: `Bearer ${process.env.OPENAI_MODERATION_API_KEY}`,
+          },
+        },
+      );
+
+      const results = response.data.results;
+      const flagged = results.some((result) => result.flagged);
+
+      if (flagged) {
+        const type = 'moderation';
+        const errorMessage = { type };
+        return await denyRequest(req, res, errorMessage);
+      }
+    } catch (error) {
+      console.error('Error in moderateText:', error);
+      const errorMessage = 'error in moderation check';
+      return await denyRequest(req, res, errorMessage);
+    }
+  }
+  next();
+}
+
+module.exports = moderateText;