don't send duplicate comments to GitHub

Author: JP Driver

scripts/post-deploy.js

@@ -21,19 +21,39 @@ module.exports = function postDeploy() {
   ![QR Code](${qrUrl})
   `;
 
-  request.post(
+  request.get(
     {
       url: issueUrl,
-      headers: { 'User-Agent': 'ci' },
-      body: JSON.stringify({ body })
+      headers: { 'User-Agent': 'ci' }
     },
-    (error, response) => {
-      if (error) {
-        console.error('Failed to post comment to GitHub, an error occurred', error);
-      } else if (response.statusCode >= 400) {
-        console.error('Failed to post comment to GitHub, request failed with', response);
+    (getError, getResponse) => {
+      if (getError) {
+        console.error('Failed to check comments on GitHub, an error occurred', getError);
+      } else if (getResponse.statusCode >= 400) {
+        console.error('Failed to check comments on GitHub, request failed with', getResponse);
       } else {
-        console.log(`Posted message to GitHub PR #${config.githubPullRequestId}`);
+        const comments = JSON.parse(getResponse.body);
+        if (!comments.filter(comment => comment.body === body).length) {
+          request.post(
+            {
+              url: issueUrl,
+              headers: { 'User-Agent': 'ci' },
+              body: JSON.stringify({ body })
+            },
+            (postError, postResponse) => {
+              if (postError) {
+                console.error('Failed to post comment to GitHub, an error occurred', postError);
+              } else if (postResponse.statusCode >= 400) {
+                console.error(
+                  'Failed to post comment to GitHub, request failed with',
+                  postResponse
+                );
+              } else {
+                console.log(`Posted message to GitHub PR #${config.githubPullRequestId}`);
+              }
+            }
+          );
+        }
       }
     }
   );