Merge pull request #80 from which-ecosystem/improved-poll-creation

Upload progress logging

1 files changed, 64 insertions, 0 deletions

diff --git a/src/hooks/useS3Preupload.tsx b/src/hooks/useS3Preupload.tsx
new file mode 100644
index 0000000..3c98e9a
--- /dev/null
+++ b/src/hooks/useS3Preupload.tsx
@@ -0,0 +1,64 @@
+import { useState, useCallback, useMemo } from 'react';
+import axios from 'axios';
+import { get } from '../requests';
+
+
+interface ProgressEvent {
+  loaded: number;
+  total: number;
+}
+
+interface Hook {
+  setValue: (value: File | string | undefined) => void;
+  isReady: boolean;
+  resolve: () => Promise<string>;
+  progress: number;
+}
+
+export default (): Hook => {
+  const [url, setUrl] = useState<string>();
+  const [file, setFile] = useState<File>();
+  const [progress, setProgress] = useState<number>(0);
+
+  const isReady = useMemo(() => Boolean(file || url), [file, url]);
+
+  const setValue: Hook['setValue'] = useCallback(value => {
+    if (value instanceof File) {
+      setFile(value);
+      setUrl(undefined);
+    } else {
+      setUrl(value);
+      setFile(undefined);
+    }
+  }, [setUrl, setFile]);
+
+  const handleUploadProgress = useCallback((progressEvent: ProgressEvent): void => {
+    setProgress(Math.round((progressEvent.loaded * 100) / progressEvent.total));
+  }, [setProgress]);
+
+  const resolve = useCallback(async (): Promise<string> => {
+    if (file) {
+      const config = {
+        headers: { 'Content-Type': 'image/png' },
+        onUploadProgress: handleUploadProgress
+      };
+
+      return get('/files')
+        .then(response => response.data)
+        .then(uploadUrl => axios.put(uploadUrl, file, config))
+        .then(response => {
+          const uri = response.config.url;
+          return uri ? uri.slice(0, uri.indexOf('?')) : '';
+        });
+    }
+    setProgress(100);
+    return url || '';
+  }, [file, handleUploadProgress, url]);
+
+  return {
+    setValue,
+    isReady,
+    resolve,
+    progress
+  };
+};