Fix

datocms · Dec 22, 2023 · 556cfad · 556cfad
1 parent ee56d97
commit 556cfad
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Showing 2 changed files with 28 additions and 3 deletions.
diff --git a/src/hooks/sourceNodes/createTypes/utils/getBase64.js b/src/hooks/sourceNodes/createTypes/utils/getBase64.js
@@ -4,14 +4,27 @@ const resizeUrl = require('./resizeUrl');
 const queryString = require('query-string');
 const { fetchRemoteFile } = require('gatsby-core-utils');
 
+var magicNumbersToMimeType = {
+  ffd8ffe0: 'image/jpeg',
+  '89504e47': 'image/png',
+  '47494638': 'image/gif',
+  '52494646': 'image/webp',
+};
+
 async function download(url, cache) {
   const absolutePath = await fetchRemoteFile({ url, cache });
-  const base64 = (await fs.readFile(absolutePath)).toString(`base64`);
+  const fileBody = await fs.readFile(absolutePath);
+  const base64 = fileBody.toString(`base64`);
+  const magicNumber = fileBody.toString('hex', 0, 4);
+
   const extension = path
     .extname(absolutePath)
     .split('.')
     .pop();
-  return `data:image/${extension};base64,${base64}`;
+
+  const mimeType = magicNumbersToMimeType[magicNumber] || `image/${extension}`;
+
+  return `data:${mimeType};base64,${base64}`;
 }
 
 module.exports = async (

diff --git a/test/__snapshots__/graphql.test.js.snap b/test/__snapshots__/graphql.test.js.snap
@@ -2585,7 +2585,19 @@ https://www.datocms-assets.com/34723/1620629638-plant.jpeg?auto=format&dpr=0.6&f
             "appeareance": Object {
               "addons": Array [],
               "editor": "seo",
-              "parameters": Object {},
+              "parameters": Object {
+                "fields": Array [
+                  "title",
+                  "description",
+                  "image",
+                  "twitter_card",
+                ],
+                "previews": Array [
+                  "google",
+                  "twitter",
+                  "facebook",
+                ],
+              },
             },
             "fieldType": "seo",
             "id": "DatoCmsField-1400203",