feat: validate trusted mint registry envelopes

src/lnurlcash/trustedMintMerge.ts

@@ -0,0 +1,43 @@
+// Hostile backup merge policy stays separate from live mint transitions:
+// local records win, and imported trust starts unlocked and unconfirmed.
+
+import type {TrustedMint} from './trustedMints'
+import {isJsonObject} from './jsonParsing'
+import {isValidMintPubkey, type MintTransition} from './trustedMintTransitions'
+
+export const mergeMints = (mints: TrustedMint[], incoming: unknown[]): MintTransition<number> => {
+  const knownServers = new Set(mints.map((mint) => mint.server))
+  const merged = [...mints]
+  let added = 0
+  for (const mint of incoming) {
+    if (
+      !isJsonObject(mint) ||
+      typeof mint.server !== 'string' ||
+      typeof mint.mintPubkey !== 'string' ||
+      typeof mint.addedAt !== 'number' ||
+      !isValidMintPubkey(mint.mintPubkey)
+    ) {
+      continue
+    }
+    if (knownServers.has(mint.server)) continue
+    merged.push({
+      server: mint.server,
+      mintPubkey: mint.mintPubkey.toLowerCase(),
+      addedAt: mint.addedAt,
+      locked: false,
+      unconfirmed: true,
+      nodeAlias: typeof mint.nodeAlias === 'string' ? mint.nodeAlias : undefined,
+      nodeColor: typeof mint.nodeColor === 'string' ? mint.nodeColor : undefined,
+      nodeCapacityMsat:
+        typeof mint.nodeCapacityMsat === 'number' ? mint.nodeCapacityMsat : undefined,
+      nodeNumChannels: typeof mint.nodeNumChannels === 'number' ? mint.nodeNumChannels : undefined,
+      nodeNumPeers: typeof mint.nodeNumPeers === 'number' ? mint.nodeNumPeers : undefined,
+      username: typeof mint.username === 'string' ? mint.username : undefined,
+    })
+    knownServers.add(mint.server)
+    added++
+  }
+  return added === 0
+    ? {mints, result: 0, changed: false}
+    : {mints: merged, result: added, changed: true}
+}

src/lnurlcash/trustedMintsRegistry.ts

@@ -0,0 +1,88 @@
+// Strict trusted-mint envelope parsing is shared by localStorage and the
+// durable cross-context commit mirror. Either source fails closed as a whole.
+
+import {isWalletOwnerId} from './storage/walletOwner'
+import type {TrustedMint} from './trustedMints'
+import {isValidMintPubkey} from './trustedMintTransitions'
+
+export const TRUSTED_MINTS_REGISTRY_VERSION = 1
+
+export type TrustedMintsRegistryEnvelope = {
+  readonly version: typeof TRUSTED_MINTS_REGISTRY_VERSION
+  readonly ownerId: string
+  readonly mints: TrustedMint[]
+}
+
+export type StoredTrustedMintsRegistry =
+  | {readonly kind: 'absent'}
+  | {readonly kind: 'malformed'}
+  | {readonly kind: 'valid'; readonly envelope: TrustedMintsRegistryEnvelope}
+
+const isRecord = (value: unknown): value is Record<string, unknown> =>
+  typeof value === 'object' && value !== null
+
+const isOptionalString = (value: unknown): boolean =>
+  value === undefined || typeof value === 'string'
+
+const isOptionalNumber = (value: unknown): boolean =>
+  value === undefined || typeof value === 'number'
+
+const isTrustedMint = (value: unknown): value is TrustedMint => {
+  if (!isRecord(value)) return false
+  return (
+    typeof value.server === 'string' &&
+    typeof value.mintPubkey === 'string' &&
+    isValidMintPubkey(value.mintPubkey) &&
+    typeof value.addedAt === 'number' &&
+    typeof value.locked === 'boolean' &&
+    (value.unconfirmed === undefined || typeof value.unconfirmed === 'boolean') &&
+    (value.pendingMintPubkey === undefined ||
+      (typeof value.pendingMintPubkey === 'string' &&
+        isValidMintPubkey(value.pendingMintPubkey))) &&
+    isOptionalString(value.nodeAlias) &&
+    isOptionalString(value.nodeColor) &&
+    isOptionalNumber(value.nodeCapacityMsat) &&
+    isOptionalNumber(value.nodeNumChannels) &&
+    isOptionalNumber(value.nodeNumPeers) &&
+    isOptionalString(value.username)
+  )
+}
+
+export const parseStoredTrustedMintsRegistry = (raw: string | null): StoredTrustedMintsRegistry => {
+  if (raw === null) return {kind: 'absent'}
+  try {
+    const parsed: unknown = JSON.parse(raw)
+    if (
+      !isRecord(parsed) ||
+      parsed.version !== TRUSTED_MINTS_REGISTRY_VERSION ||
+      !isWalletOwnerId(parsed.ownerId) ||
+      !Array.isArray(parsed.mints) ||
+      !parsed.mints.every(isTrustedMint)
+    ) {
+      return {kind: 'malformed'}
+    }
+    return {
+      kind: 'valid',
+      envelope: {
+        version: TRUSTED_MINTS_REGISTRY_VERSION,
+        ownerId: parsed.ownerId,
+        mints: parsed.mints,
+      },
+    }
+  } catch {
+    return {kind: 'malformed'}
+  }
+}
+
+export const parseLegacyTrustedMintsRegistry = (raw: string | null): TrustedMint[] | null => {
+  if (raw === null) return null
+  try {
+    const parsed: unknown = JSON.parse(raw)
+    return Array.isArray(parsed) && parsed.every(isTrustedMint) ? parsed : null
+  } catch {
+    return null
+  }
+}
+
+export const serializeTrustedMintsRegistry = (ownerId: string, mints: TrustedMint[]): string =>
+  JSON.stringify({version: TRUSTED_MINTS_REGISTRY_VERSION, ownerId, mints})