action.yml: add support for private patches

action.yml

@@ -27,15 +27,18 @@ runs:
       uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
       if: ${{ inputs.openai_api_key != '' }}
       env:
-        OPENAI_API_KEY: ${{ inputs.openai_api_key }} 
+        OPENAI_API_KEY: ${{ inputs.openai_api_key }}
+        GITHUB_TOKEN: ${{ inputs.github_token }}
+        PRNUM: ${{ github.event.issue.number }} 
       with:
           script: |
             const { default: explainPatch } = await import('${{ github.action_path }}/src/openaiExplainPatch.js')
             console.log(process.env)
             console.log(await explainPatch({
               openaiKey: process.env.OPENAI_API_KEY,
+              githubToken: process.env.GITHUB_TOKEN,
               repo: process.env.GITHUB_ACTION_REPOSITORY,
-              prnum: process.env.GITHUB_REF_NAME.split('/')[0]}))
+              prnum: process.env.PRNUM}))
 
             console.log('rerun')
             console.log('implement me')

src/openaiExplainPatch.js

@@ -1,6 +1,7 @@
 import OpenAI from "openai";
 
-export default async function explainPatch({openaiKey, repo, prnum, 
+export default async function explainPatch({openaiKey, repo, prnum,
+  githubToken=null, 
   model="gpt-3.5-turbo-16k",
   system_prompt="Explain the patch:\n\n",
   max_tokens=256,
@@ -10,7 +11,17 @@ export default async function explainPatch({openaiKey, repo, prnum,
   presence_penalty=0}) {
   const openai = new OpenAI({apiKey: openaiKey});
 
-  const patchResponse = await fetch(`https://github.com/${repo}/pull/${prnum}.patch`);
+  const githubHeaders = {
+    Accept: 'application/vnd.github.3.patch',
+    'X-GitHub-Api-Version': '2022-11-28'
+  };
+
+  if (githubToken)
+    githubHeaders['Authorization'] = `Bearer ${githubToken}`;
+
+  const patchResponse = await fetch(`https://api.github.com/repos/${repo}/pulls/${prnum}.patch`, {
+    method: 'GET',
+    headers: githubHeaders});
   const patchBody = await patchResponse.text();
 
   return patchBody;