fix: Add fallback for createContentDigest (gatsbyjs#13584)

src/create-file-node.js

@@ -5,7 +5,7 @@ const mime = require(`mime`)
 const prettyBytes = require(`pretty-bytes`)
 
 const md5File = require(`bluebird`).promisify(require(`md5-file`))
-const crypto = require(`crypto`)
+const { createContentDigest } = require(`./fallback`)
 
 exports.createFileNode = async (
   pathToFile,
@@ -27,12 +27,10 @@ exports.createFileNode = async (
   const stats = await fs.stat(slashedFile.absolutePath)
   let internal
   if (stats.isDirectory()) {
-    const contentDigest = crypto
-      .createHash(`md5`)
-      .update(
-        JSON.stringify({ stats: stats, absolutePath: slashedFile.absolutePath })
-      )
-      .digest(`hex`)
+    const contentDigest = createContentDigest({
+      stats: stats,
+      absolutePath: slashedFile.absolutePath,
+    })
     internal = {
       contentDigest,
       type: `Directory`,

src/create-remote-file-node.js

@@ -1,6 +1,6 @@
 const fs = require(`fs-extra`)
 const got = require(`got`)
-const crypto = require(`crypto`)
+const { createContentDigest } = require(`./fallback`)
 const path = require(`path`)
 const { isWebUri } = require(`valid-url`)
 const Queue = require(`better-queue`)
@@ -53,24 +53,6 @@ const bar = new ProgressBar(
  * @param  {Auth} [options.auth]
  */
 
-/*********
- * utils *
- *********/
-
-/**
- * createHash
- * --
- *
- * Create an md5 hash of the given str
- * @param  {Stringq} str
- * @return {String}
- */
-const createHash = str =>
-  crypto
-    .createHash(`md5`)
-    .update(str)
-    .digest(`hex`)
-
 const CACHE_DIR = `.cache`
 const FS_PLUGIN_DIR = `gatsby-source-filesystem`
 
@@ -215,7 +197,7 @@ async function processRemoteNode({
   }
 
   // Create the temp and permanent file names for the url.
-  const digest = createHash(url)
+  const digest = createContentDigest(url)
   if (!name) {
     name = getRemoteFileName(url)
   }

src/fallback.js

@@ -0,0 +1,15 @@
+// TODO: remove in gatsby v3
+exports.createContentDigest = input => {
+  try {
+    const { createContentDigest } = require(`gatsby/utils`)
+
+    return createContentDigest(input)
+  } catch (e) {
+    const content = typeof input !== `string` ? JSON.stringify(input) : input
+
+    return require(`crypto`)
+      .createHash(`md5`)
+      .update(content)
+      .digest(`hex`)
+  }
+}