1 files changed, 25 insertions, 13 deletions
diff --git a/app/assets/javascripts/ide/components/new_dropdown/upload.vue b/app/assets/javascripts/ide/components/new_dropdown/upload.vue
index e2be805ed22..ec759043efc 100644
--- a/app/assets/javascripts/ide/components/new_dropdown/upload.vue
+++ b/app/assets/javascripts/ide/components/new_dropdown/upload.vue
@@ -25,14 +25,32 @@ export default {
     },
   },
   methods: {
-    createFile(target, file, isText) {
+    isText(content, fileType) {
+      const knownBinaryFileTypes = ['image/'];
+      const knownTextFileTypes = ['text/'];
+      const isKnownBinaryFileType = knownBinaryFileTypes.find(type => fileType.includes(type));
+      const isKnownTextFileType = knownTextFileTypes.find(type => fileType.includes(type));
+      const asciiRegex = /^[ -~\t\n\r]+$/; // tests whether a string contains ascii characters only (ranges from space to tilde, tabs and new lines)
+
+      if (isKnownBinaryFileType) {
+        return false;
+      }
+
+      if (isKnownTextFileType) {
+        return true;
+      }
+
+      // if it's not a known file type, determine the type by evaluating the file contents
+      return asciiRegex.test(content);
+    },
+    createFile(target, file) {
       const { name } = file;
       let { result } = target;
+      const encodedContent = result.split('base64,')[1];
+      const rawContent = encodedContent ? atob(encodedContent) : '';
+      const isText = this.isText(rawContent, file.type);
 
-      if (!isText) {
-        // eslint-disable-next-line prefer-destructuring
-        result = result.split('base64,')[1];
-      }
+      result = isText ? rawContent : encodedContent;
 
       this.$emit('create', {
         name: `${this.path ? `${this.path}/` : ''}${name}`,
@@ -43,15 +61,9 @@ export default {
     },
     readFile(file) {
       const reader = new FileReader();
-      const isText = file.type.match(/text.*/) !== null;
 
-      reader.addEventListener('load', e => this.createFile(e.target, file, isText), { once: true });
-
-      if (isText) {
-        reader.readAsText(file);
-      } else {
-        reader.readAsDataURL(file);
-      }
+      reader.addEventListener('load', e => this.createFile(e.target, file), { once: true });
+      reader.readAsDataURL(file);
     },
     openFile() {
       Array.from(this.$refs.fileUpload.files).forEach(file => this.readFile(file));