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feat: implement read-only mode for sealed letters and handle error boundaries

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This commit is contained in:
ramvignesh-b
2026-04-15 17:07:35 +05:30
parent fd64578a17
commit 75dd187442
5 changed files with 493 additions and 169 deletions
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frontend/src/utils/letterLogic.ts
+46 -26
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@@ -18,33 +18,47 @@ export async function decryptCanvasImages(
masterKey: CryptoKey,
cryptoUtils: CryptoUtils,
includeRawFile = false,
) {
if (!canvasData?.objects) return;
): Promise<{ isDecryptionPartialFailure: boolean; error: string }> {
if (!canvasData?.objects)
return { isDecryptionPartialFailure: false, error: "" };
let isDecryptionPartialFailure = false;
let error = "";
const imageMap = new Map(
remoteImages.map((img) => [img.file_name, img.file]),
);
for (const obj of canvasData.objects) {
if (obj.type !== "Image") continue;
const decryptionPromises = canvasData.objects.map(async (obj, index) => {
if (obj.type !== "Image") return;
const imgObj = obj as FabricImageJSON;
const originalSrc = imgObj.src;
const remoteUrl = imageMap.get(originalSrc);
if (!remoteUrl) continue;
const remoteUrl = imageMap.get(imgObj.src);
if (!remoteUrl) return;
const res = await api.get(remoteUrl, { responseType: "blob" });
const blobUrl = await cryptoUtils.decryptImage(
res.data,
encrypted_dek,
masterKey,
);
try {
const res = await api.get(remoteUrl, { responseType: "blob" });
const originalSrc = imgObj.src;
imgObj.src = blobUrl;
const blobUrl = await cryptoUtils.decryptImage(
res.data,
encrypted_dek,
masterKey,
);
if (includeRawFile) {
imgObj._customRawFile = await blobUrlToFile(blobUrl, originalSrc);
imgObj.src = blobUrl;
if (includeRawFile) {
imgObj._customRawFile = await blobUrlToFile(blobUrl, originalSrc);
}
} catch (_error) {
delete canvasData.objects[index];
isDecryptionPartialFailure = true;
error = _error instanceof Error ? _error.message : "Unknown error";
}
}
});
await Promise.all(decryptionPromises);
canvasData.objects = canvasData.objects.filter(Boolean);
return { isDecryptionPartialFailure, error };
}
export async function decryptCanvasImagesWithSharingKey(
@@ -59,19 +73,25 @@ export async function decryptCanvasImagesWithSharingKey(
remoteImages.map((img) => [img.file_name, img.file]),
);
for (const obj of canvasData.objects) {
if (obj.type !== "Image") continue;
const decryptionPromises = canvasData.objects.map(async (obj) => {
if (obj.type !== "Image") return;
const imgObj = obj as FabricImageJSON;
const remoteUrl = imageMap.get(imgObj.src);
if (!remoteUrl) continue;
if (!remoteUrl) return;
const res = await api.get(remoteUrl, { responseType: "blob" });
imgObj.src = await cryptoUtils.decryptImageWithSharingKey(
res.data,
sharingKey,
);
}
try {
const res = await api.get(remoteUrl, { responseType: "blob" });
imgObj.src = await cryptoUtils.decryptImageWithSharingKey(
res.data,
sharingKey,
);
} catch (_error) {
// Keep original or handle failure
}
});
await Promise.all(decryptionPromises);
}
export async function encryptCanvasImages(