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[#376] Fall back to provided content on IPFS hash mismatch #377

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Merged
realproject7 merged 1 commit into from
Mar 20, 2026
Merged

[#376] Fall back to provided content on IPFS hash mismatch #377

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25 changes: 16 additions & 9 deletions src/app/api/index/plot/route.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -74,24 +74,31 @@ export async function POST(req: Request) {
decoded.args;

// 4. Fetch content from IPFS (with fallback)
let content: string;
let content: string | null = null;
try {
const ipfsRes = await fetch(`${IPFS_GATEWAY}${contentCID}`, {
signal: AbortSignal.timeout(IPFS_TIMEOUT_MS),
});
if (!ipfsRes.ok) throw new Error(`IPFS status ${ipfsRes.status}`);
content = await ipfsRes.text();
const ipfsContent = await ipfsRes.text();
// Verify IPFS content hash matches on-chain hash
if (hashContent(ipfsContent) === contentHash) {
content = ipfsContent;
}
// If hash mismatches, fall through to fallback content below
} catch {
if (!fallbackContent) {
return error("IPFS fetch failed and no fallback content provided", 502);
// IPFS fetch failed — fall through to fallback content below
}

// 5. Try fallback content if IPFS content was unavailable or hash-mismatched
if (!content && fallbackContent) {
if (hashContent(fallbackContent) === contentHash) {
content = fallbackContent;
}
content = fallbackContent;
}

// 5. Verify content hash
const computedHash = hashContent(content);
if (computedHash !== contentHash) {
return error("Content hash mismatch");
if (!content) {
return error("Content hash mismatch (IPFS and fallback both failed)");
}

// 6. Get block timestamp
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28 changes: 16 additions & 12 deletions src/app/api/index/storyline/route.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -100,27 +100,31 @@ export async function POST(req: Request) {
const writerType = await detectWriterType(writer);

// 6. Fetch genesis plot content from IPFS (with fallback)
let genesisContent: string;
let genesisContent: string | null = null;
try {
const ipfsRes = await fetch(`${IPFS_GATEWAY}${openingCID}`, {
signal: AbortSignal.timeout(IPFS_TIMEOUT_MS),
});
if (!ipfsRes.ok) throw new Error(`IPFS status ${ipfsRes.status}`);
genesisContent = await ipfsRes.text();
const ipfsContent = await ipfsRes.text();
// Verify IPFS content hash matches on-chain hash
if (hashContent(ipfsContent) === openingHash) {
genesisContent = ipfsContent;
}
// If hash mismatches, fall through to fallback content below
} catch {
if (!fallbackContent) {
return error(
"IPFS fetch failed and no fallback content provided",
502
);
// IPFS fetch failed — fall through to fallback content below
}

// 7. Try fallback content if IPFS content was unavailable or hash-mismatched
if (!genesisContent && fallbackContent) {
if (hashContent(fallbackContent) === openingHash) {
genesisContent = fallbackContent;
}
genesisContent = fallbackContent;
}

// 7. Verify genesis content hash
const computedHash = hashContent(genesisContent);
if (computedHash !== openingHash) {
return error("Genesis content hash mismatch");
if (!genesisContent) {
return error("Genesis content hash mismatch (IPFS and fallback both failed)");
}

// 8. Upsert storyline to Supabase
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