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Feat/image loading errors #858

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Feat/image loading errors #858

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bd6b1e7
fix(cors): 400 res on missing url
bitbeckers Jun 20, 2023
ee89e21
feat(canvas): error handling and toast
bitbeckers Jun 20, 2023
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5 changes: 4 additions & 1 deletion cors-proxy/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -64,7 +64,10 @@ export default {
const apiUrl = url.searchParams.get(QUERYSTRING_KEY);

if (apiUrl == null) {
return new Response(`Missing GET parameter: ${QUERYSTRING_KEY}`);
return new Response(`Missing GET parameter: ${QUERYSTRING_KEY}`, {
status: 400,
statusText: `Bad Request: ${QUERYSTRING_KEY} param undefined`,
});
}

// Rewrite request to point to API URL. This also makes the request mutable
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17 changes: 17 additions & 0 deletions frontend/components/hypercert-create.tsx
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Expand Up @@ -379,6 +379,12 @@ export function HypercertCreateForm(props: HypercertCreateFormProps) {
}

const image = await exportAsImage(IMAGE_SELECTOR);

if (!image) {
setSubmitting(false);
return;
}

const metaData = formatValuesToMetaData(
values,
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
Expand Down Expand Up @@ -516,7 +522,18 @@ const exportAsImage = async (id: string) => {
//useCORS: true,
proxy: "https://cors-proxy.hypercerts.workers.dev/",
imageTimeout: 0,
}).catch((e) => {
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Are we sure that html2canvas will throw an error if fetching the image fails? Worth some testing either manually or via unit/integration tests.

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Actually now that I think about it, I don't think this solves the issue, because without the catch any thrown errors should stop everything. Instead the behavior we see is that the hypercert mints anyway with the broken images.

So catching is insufficient....

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Yep found the same during testing rn. I'm going to think about an alternative route. Because it's not like the canvas will be empty (that'd be easy to check), it's missing one specific layer

toast("Error loading hypercert image . Please contact the team.", {
type: "error",
});
console.error("Error exporting image: ", e);
return undefined;
});

if (!canvas) {
return undefined;
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Probably should show an error message?

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+1

}

const image = canvas.toDataURL("image/png", 1.0);
return image;
};