From 41cc031088fca436f644181227a5b8eb76f30875 Mon Sep 17 00:00:00 2001
From: Ryan Brooks <ryanjeffrey.brooks112@gmail.com>
Date: Tue, 7 Dec 2021 21:34:48 -0800
Subject: [PATCH] Update to pass baseSha to upload enpoint. Update version in
 readme

---
 README.md     |  4 ++--
 src/inputs.ts | 25 ++++++++++++++++++++-----
 src/types.ts  |  1 +
 src/upload.ts |  1 +
 4 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index a6dec80..6847cb9 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Add the API key to your secrets in your repository. **Do not leave this key in p
 ### Incorporate in your workflow
 
 Build your artifact in a step before the Emerge upload action. Pass the generated artifact's path as the `artifact_path`
-argument, and your Emerge API key secret as the `emerge_api_key` argument 
+argument, and your Emerge API key secret as the `emerge_api_key` argument:
 
 ```yaml
 name: Your workflow
@@ -45,7 +45,7 @@ jobs:
       - name: Generate Android release bundle
         run: ./gradlew bundleRelease
       - name: Upload artifact to Emerge
-        uses: EmergeTools/emerge-upload-action@v1.0.0
+        uses: EmergeTools/emerge-upload-action@v1.0.1
         with:
           artifact_path: ./app/build/outputs/bundle/release/app-release.aab
           emerge_api_key: ${{ secrets.EMERGE_API_KEY }}
diff --git a/src/inputs.ts b/src/inputs.ts
index b7bbdc5..b9fb526 100644
--- a/src/inputs.ts
+++ b/src/inputs.ts
@@ -6,6 +6,10 @@ import { getPRNumber, getAbsoluteArtifactPath } from './utils';
 const core = require('@actions/core');
 const github = require('@actions/github');
 
+// The sha set for `before` on push events if the first push to a commit. This should not ever be the case if
+// pushing to main unless it's the initial commit.
+const DEFAULT_PUSH_BEFORE_SHA = '0000000000000000000000000000000000000000';
+
 function getInputs(): UploadInputs {
   core.info('Parsing inputs...');
 
@@ -23,21 +27,31 @@ function getInputs(): UploadInputs {
   // of the commit that triggered this action.
   // Therefore, on a PR we need to explicitly get the head sha
   let sha;
+  let baseSha;
   let branchName;
+  const eventFile = fs.readFileSync(process.env.GITHUB_EVENT_PATH ?? '', {
+    encoding: 'utf8',
+  });
+  const eventFileJson = JSON.parse(eventFile);
   if (process.env.GITHUB_EVENT_NAME === 'pull_request') {
-    const eventFile = fs.readFileSync(process.env.GITHUB_EVENT_PATH ?? '', {
-      encoding: 'utf8',
-    });
-    const eventFileJson = JSON.parse(eventFile);
     sha = eventFileJson?.pull_request?.head?.sha ?? process.env.GITHUB_SHA ?? '';
+    baseSha = eventFileJson?.pull_request?.base?.sha ?? '';
     branchName = process.env.GITHUB_HEAD_REF ?? '';
-  } else {
+  } else if (process.env.GITHUB_EVENT_NAME === 'push') {
     sha = process.env.GITHUB_SHA ?? '';
+    // Get the SHA of the previous commit, which will be the baseSha in the case of a push event.
+    baseSha = eventFileJson?.before ?? '';
+    if (eventFileJson?.baseRef === null || baseSha === DEFAULT_PUSH_BEFORE_SHA) {
+      baseSha = '';
+    }
+
     const ref = process.env.GITHUB_REF ?? '';
     if (ref !== '') {
       const refSplits = ref.split('/');
       branchName = refSplits[refSplits.length - 1];
     }
+  } else {
+    core.setFailed(`Unsupported action trigger: ${process.env.GITHUB_EVENT_NAME}`);
   }
 
   if (sha === '') {
@@ -78,6 +92,7 @@ function getInputs(): UploadInputs {
     filename,
     emergeApiKey,
     sha,
+    baseSha,
     repoName,
     prNumber,
     buildType,
diff --git a/src/types.ts b/src/types.ts
index 0088e78..84b8a86 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -5,6 +5,7 @@ export type UploadInputs = {
   filename: string
   emergeApiKey: string
   sha: string
+  baseSha: string
   repoName: string
 
   // Required for PRs
diff --git a/src/upload.ts b/src/upload.ts
index 2344e88..4c27210 100644
--- a/src/upload.ts
+++ b/src/upload.ts
@@ -12,6 +12,7 @@ async function run(): Promise<void> {
     prNumber: inputs.prNumber,
     branch: inputs.branchName,
     sha: inputs.sha,
+    baseSha: inputs.baseSha,
     repoName: inputs.repoName,
     buildType: inputs.buildType,
   };