1 files changed, 35 insertions, 0 deletions
diff --git a/activestorage/app/javascript/activestorage/blob_upload.js b/activestorage/app/javascript/activestorage/blob_upload.js
new file mode 100644
index 0000000000..277cc8ff8e
--- /dev/null
+++ b/activestorage/app/javascript/activestorage/blob_upload.js
@@ -0,0 +1,35 @@
+export class BlobUpload {
+  constructor(blob) {
+    this.blob = blob
+    this.file = blob.file
+
+    const { url, headers } = blob.directUploadData
+
+    this.xhr = new XMLHttpRequest
+    this.xhr.open("PUT", url, true)
+    this.xhr.responseType = "text"
+    for (const key in headers) {
+      this.xhr.setRequestHeader(key, headers[key])
+    }
+    this.xhr.addEventListener("load", event => this.requestDidLoad(event))
+    this.xhr.addEventListener("error", event => this.requestDidError(event))
+  }
+
+  create(callback) {
+    this.callback = callback
+    this.xhr.send(this.file.slice())
+  }
+
+  requestDidLoad(event) {
+    const { status, response } = this.xhr
+    if (status >= 200 && status < 300) {
+      this.callback(null, response)
+    } else {
+      this.requestDidError(event)
+    }
+  }
+
+  requestDidError(event) {
+    this.callback(`Error storing "${this.file.name}". Status: ${this.xhr.status}`)
+  }
+}