fix eml uploader to allow arbitrary preambles (#6565)

ampproject · Feb 1, 2023 · 08b31da · 08b31da
1 parent df1c26b
commit 08b31da
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Showing 2 changed files with 7 additions and 4 deletions.
diff --git a/gitblah-o5en b/gitblah-o5en
diff --git a/playground/src/email-loader/email-loader.js b/playground/src/email-loader/email-loader.js
@@ -104,10 +104,13 @@ class EmailLoader {
 
   parseMultipartBody(body, boundary) {
     const rawParts = body.split('--' + boundary);
-    if (
-      rawParts[0].trim() !== '' ||
-      rawParts[rawParts.length - 1].trim() !== '--'
-    ) {
+
+    // See https://bit.ly/3wHQtDw
+    // by spec, you can have anything string before the first boundary.
+    // So we just dump everything before the first CLRF
+    rawParts[0] = '';
+
+    if (rawParts[rawParts.length - 1].trim() !== '--') {
       throw new Error('Invalid multipart body');
     }
     const parts = rawParts.slice(1, -1);