Add findImgSrc

1 files changed, 19 insertions, 0 deletions

diff --git a/webAO/utils/findImgSrc.ts b/webAO/utils/findImgSrc.ts
new file mode 100644
index 0000000..b4db849
--- /dev/null
+++ b/webAO/utils/findImgSrc.ts
@@ -0,0 +1,19 @@
+import filesExist from "./filesExist";
+import transparentPng from '../constants/transparentPng'
+
+/**
+ * This function takes a list of urls and returns the first one that exists.
+ * If none is found, return a transparent png.
+ * The function will always return a value that is appriopriate for an img src.
+ * @param urls The list of urls to try
+ * @returns The image source of the first url that exists, or a transparent png if none exist
+ */
+export default async function findImgSrc(urls: string[]): Promise<string> {
+    return filesExist(urls).then((url) => {
+        if (url !== null) {
+            return url;
+        }
+        // If none of the images exist, return a transparent png
+        return transparentPng;
+    });
+}