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* 5N Loop Wallet adapter implementation\n *\n * Uses the official @fivenorth/loop-sdk NPM package which communicates\n * with Loop wallet via QR code / popup flow over WebSocket.\n *\n * Reference: https://github.com/fivenorth-io/loop-sdk\n * Wallet Integration Guide: https://docs.digitalasset.com/integrate/devnet/index.html\n */\n\nimport type {\n WalletAdapter,\n AdapterContext,\n AdapterDetectResult,\n AdapterConnectResult,\n SignMessageParams,\n SignTransactionParams,\n SubmitTransactionParams,\n SignedMessage,\n SignedTransaction,\n TxReceipt,\n LedgerApiParams,\n LedgerApiResult,\n Session,\n PersistedSession,\n CapabilityKey,\n PartyId,\n} from '@partylayer/core';\nimport {\n toWalletId,\n toPartyId,\n toTransactionHash,\n toSignature,\n PartyLayerError,\n WalletNotInstalledError,\n CapabilityNotSupportedError,\n mapUnknownErrorToPartyLayerError,\n ledgerApiBodyToString,\n} from '@partylayer/core';\nimport type { ErrorCode } from '@partylayer/core';\nimport {\n loop,\n RequestTimeoutError,\n UnauthorizedError,\n PaymentRequiredError,\n RejectRequestError,\n PopupClosedError,\n} from '@fivenorth/loop-sdk';\n\n// The SDK does not re-export its `Provider` type by name from the package root,\n// so derive it from `loop.init`'s `onAccept` parameter. This is the REAL 0.13.x\n// provider (with getAccount, signMessage, submitTransaction, getActiveContracts).\ntype LoopProvider = Parameters[0]['onAccept']>>[0];\ntype LoopSubmitPayload = Parameters[0];\n\n/**\n * Map a Loop SDK 0.13 structured error onto the PartyLayer error taxonomy so a\n * consumer can distinguish auth from rate-limit from timeout from a user\n * rejection by a stable `code` (plus `details.status` where the SDK reports one),\n * rather than parsing a message string. Returns `null` when `err` is not one of\n * the SDK's structured errors, so callers keep their existing descriptive\n * wrapping for everything else. The original error is always preserved as `cause`.\n */\nfunction mapLoopStructuredError(\n err: unknown,\n context: { operation: string; hint?: string },\n): PartyLayerError | null {\n const suffix = context.hint ? ` ${context.hint}` : '';\n const make = (message: string, code: ErrorCode, details?: Record) =>\n new PartyLayerError(message, code, { cause: err, details: { operation: context.operation, ...details } });\n\n if (err instanceof RequestTimeoutError) {\n return make(`Loop ${context.operation} timed out. ${err.message}${suffix}`, 'TIMEOUT');\n }\n if (err instanceof UnauthorizedError) {\n // A 401 from Loop means the auth token is no longer valid; the user must reconnect.\n return make(\n `Loop rejected ${context.operation}: unauthorized. Reconnect your Loop wallet.${suffix}`,\n 'SESSION_EXPIRED',\n { status: 401, loopCode: err.code },\n );\n }\n if (err instanceof PaymentRequiredError) {\n // 402/limit-class: the traffic allowance is exhausted (payment/gas required or a\n // request limit was hit). This is the one real traffic signal reaching the kit.\n return make(\n `Loop ${context.operation} needs payment or gas, or hit a request limit. ${err.message}${suffix}`,\n 'INSUFFICIENT_TRAFFIC',\n { status: 402, loopCode: err.code, gasAmount: err.gasAmount, trackingId: err.trackingId, loopStatus: err.status },\n );\n }\n if (err instanceof RejectRequestError || err instanceof PopupClosedError) {\n return make(`User rejected Loop ${context.operation}. ${err.message}`, 'USER_REJECTED', {\n loopCode: err instanceof RejectRequestError ? err.code : undefined,\n });\n }\n return null;\n}\n\n/**\n * Loop Wallet adapter\n *\n * Implements WalletAdapter interface for 5N Loop Wallet using the official\n * Loop SDK. The SDK handles QR code display, WebSocket communication, and\n * popup/tab-based signing flows.\n *\n * Note: Loop sessions use WebSocket + localStorage for persistence.\n * The SDK's autoConnect() can restore sessions if the auth token is still valid.\n */\nexport class LoopAdapter implements WalletAdapter {\n readonly walletId = toWalletId('loop');\n readonly name = '5N Loop';\n\n private currentProvider: LoopProvider | null = null;\n\n getCapabilities(): CapabilityKey[] {\n return [\n 'connect',\n 'disconnect',\n 'restore',\n 'signMessage',\n 'submitTransaction',\n 'ledgerApi',\n 'events',\n 'popup',\n ];\n }\n\n /**\n * Detect if Loop SDK is available.\n *\n * Loop uses QR code / popup flow — no browser extension needed.\n * Always returns true in browser environments since the SDK is\n * bundled as a dependency.\n */\n async detectInstalled(): Promise {\n if (typeof window === 'undefined') {\n return {\n installed: false,\n reason: 'Browser environment required',\n };\n }\n\n return {\n installed: true,\n reason: 'Loop Wallet available via QR code scan or popup.',\n };\n }\n\n /**\n * Connect to Loop Wallet.\n *\n * Flow:\n * 1. Initialize Loop SDK with app name and network\n * 2. Call connect() which first tries autoConnect (session restore)\n * 3. If no cached session, opens QR code overlay for user to scan\n * 4. User scans QR with Loop mobile app or approves in popup\n * 5. onAccept callback receives provider with party_id\n */\n async connect(\n ctx: AdapterContext,\n opts?: {\n timeoutMs?: number;\n partyId?: PartyId;\n },\n ): Promise {\n try {\n if (typeof window === 'undefined') {\n throw new WalletNotInstalledError(\n this.walletId,\n 'Browser environment required',\n );\n }\n\n ctx.logger.debug('Connecting to Loop Wallet', {\n appName: ctx.appName,\n origin: ctx.origin,\n network: ctx.network,\n });\n\n // Map network to Loop format\n const loopNetwork = this.mapNetworkToLoop(ctx.network);\n\n return new Promise((resolve, reject) => {\n let resolved = false;\n const timeout = opts?.timeoutMs || 300000; // 5 min default for QR scan\n\n const timeoutId = setTimeout(() => {\n if (!resolved) {\n resolved = true;\n reject(\n new Error(\n 'Connection timeout — user did not complete QR scan',\n ),\n );\n }\n }, timeout);\n\n // Initialize and connect via the official SDK\n loop.init({\n appName: ctx.appName,\n network: loopNetwork,\n onTransactionUpdate: (payload) => {\n ctx.logger.debug('Loop transaction update', payload);\n },\n options: {\n openMode: 'popup',\n requestSigningMode: 'popup',\n },\n onAccept: async (provider: LoopProvider) => {\n if (resolved) return;\n resolved = true;\n clearTimeout(timeoutId);\n\n this.currentProvider = provider;\n const partyId = toPartyId(provider.party_id);\n\n ctx.logger.info('Connected to Loop Wallet', {\n partyId: provider.party_id,\n });\n\n // Fund-safety passthrough: read the wallet's payout-preapproval signal\n // so consumers can tell whether a payout to this party lands directly\n // or may strand as an unaccepted offer. Best-effort: getAccount()\n // failing must NOT break connect; proceed with the fields absent.\n const preapproval = await this.readPreapproval(provider, ctx);\n\n resolve({\n partyId,\n session: {\n walletId: this.walletId,\n // Loop's connect callback does not report the connected network\n // → not wallet-reported, so network-mismatch detection is\n // limited for this adapter (echoes the requested ctx.network).\n network: ctx.network,\n createdAt: Date.now(),\n ...preapproval,\n },\n capabilities: this.getCapabilities(),\n });\n },\n onReject: () => {\n if (resolved) return;\n resolved = true;\n clearTimeout(timeoutId);\n reject(new Error('User rejected connection'));\n },\n });\n\n // Initiate connection (opens QR code overlay or auto-connects)\n loop.connect().catch((err) => {\n if (resolved) return;\n resolved = true;\n clearTimeout(timeoutId);\n reject(err);\n });\n });\n } catch (err) {\n throw mapUnknownErrorToPartyLayerError(err, {\n walletId: this.walletId,\n phase: 'connect',\n transport: 'popup',\n details: {\n origin: ctx.origin,\n network: ctx.network,\n },\n });\n }\n }\n\n /**\n * Read the wallet's payout-preapproval signal via the SDK's getAccount(),\n * mapping the SDK's snake_case fields to our camelCase session fields. Purely\n * a passthrough of what the wallet reports; nothing is inferred. Best-effort:\n * any failure is logged and yields an empty object so connect still succeeds.\n */\n private async readPreapproval(\n provider: LoopProvider,\n ctx: AdapterContext,\n ): Promise> {\n try {\n const account = await provider.getAccount();\n return {\n hasPreapproval: account.has_preapproval,\n utilityPreapprovalAdmins: account.utility_preapproval_admins,\n };\n } catch (err) {\n ctx.logger.debug('Loop getAccount() failed; preapproval signal unavailable', {\n error: (err as Error)?.message,\n });\n return {};\n }\n }\n\n /**\n * Disconnect from Loop Wallet.\n *\n * Calls the SDK's logout() which clears the session, closes\n * the WebSocket, and removes the QR overlay if visible.\n */\n async disconnect(_ctx: AdapterContext, _session: Session): Promise {\n try {\n loop.logout();\n } catch {\n // Ignore logout errors\n }\n this.currentProvider = null;\n }\n\n /**\n * Restore session.\n *\n * Loop SDK persists sessions in localStorage. We can attempt\n * autoConnect() to restore a valid session without showing the QR code.\n */\n async restore(\n ctx: AdapterContext,\n persisted: PersistedSession,\n ): Promise {\n try {\n if (typeof window === 'undefined') return null;\n\n if (persisted.expiresAt && Date.now() >= persisted.expiresAt) {\n return null;\n }\n\n // Try auto-connect — the SDK checks localStorage for a valid auth token\n const loopNetwork = this.mapNetworkToLoop(persisted.network || ctx.network);\n\n return new Promise((resolve) => {\n let resolved = false;\n\n // 5 second timeout for auto-connect\n const timeoutId = setTimeout(() => {\n if (!resolved) {\n resolved = true;\n ctx.logger.debug(\n 'Loop Wallet auto-connect timed out, session not restorable',\n );\n resolve(null);\n }\n }, 5000);\n\n loop.init({\n appName: ctx.appName,\n network: loopNetwork,\n onAccept: (provider: LoopProvider) => {\n if (resolved) return;\n resolved = true;\n clearTimeout(timeoutId);\n\n this.currentProvider = provider;\n ctx.logger.debug('Restored Loop Wallet session via auto-connect', {\n partyId: provider.party_id,\n });\n\n resolve({ ...persisted, walletId: this.walletId });\n },\n onReject: () => {\n if (resolved) return;\n resolved = true;\n clearTimeout(timeoutId);\n resolve(null);\n },\n });\n\n // autoConnect checks localStorage and reconnects if valid\n loop.autoConnect().catch(() => {\n if (!resolved) {\n resolved = true;\n clearTimeout(timeoutId);\n resolve(null);\n }\n });\n });\n } catch (err) {\n ctx.logger.warn('Failed to restore Loop Wallet session', err);\n return null;\n }\n }\n\n /**\n * Sign a message.\n */\n async signMessage(\n ctx: AdapterContext,\n session: Session,\n params: SignMessageParams,\n ): Promise {\n try {\n if (!this.currentProvider) {\n throw new Error('Not connected to Loop Wallet');\n }\n\n ctx.logger.debug('Signing message with Loop Wallet', {\n sessionId: session.sessionId,\n messageLength: params.message.length,\n });\n\n const signature = await this.currentProvider.signMessage(params.message);\n\n return {\n signature: toSignature(signature),\n partyId: session.partyId,\n message: params.message,\n nonce: params.nonce,\n domain: params.domain,\n };\n } catch (err) {\n throw mapUnknownErrorToPartyLayerError(err, {\n walletId: this.walletId,\n phase: 'signMessage',\n transport: 'popup',\n details: {\n sessionId: session.sessionId,\n },\n });\n }\n }\n\n /**\n * Sign a transaction.\n *\n * Loop SDK combines signing and submission. For sign-only,\n * throw CapabilityNotSupportedError.\n */\n async signTransaction(\n _ctx: AdapterContext,\n _session: Session,\n _params: SignTransactionParams,\n ): Promise {\n throw new CapabilityNotSupportedError(\n this.walletId,\n 'signTransaction — Loop SDK combines signing and submission. Use submitTransaction instead.',\n );\n }\n\n /**\n * Submit a transaction.\n *\n * Loop SDK's submitTransaction signs and submits the DAML command.\n * Returns command_id and submission_id.\n */\n async submitTransaction(\n ctx: AdapterContext,\n session: Session,\n params: SubmitTransactionParams,\n ): Promise {\n try {\n if (!this.currentProvider) {\n throw new Error('Not connected to Loop Wallet');\n }\n\n ctx.logger.debug('Submitting transaction with Loop Wallet', {\n sessionId: session.sessionId,\n });\n\n const result = await this.currentProvider.submitTransaction(\n // Passthrough: signedTx is opaque, the caller owns its shape.\n params.signedTx as unknown as LoopSubmitPayload,\n {\n message: 'Submit transaction via PartyLayer',\n },\n );\n\n // Loop SDK resolves with whatever the wallet server sent back in\n // the response payload. On success it's `{ command_id, submission_id }`,\n // but empty or rejected responses can come through as undefined / {}.\n // Guard before dereferencing so consumers don't see an opaque\n // \"Cannot read properties of undefined\" or \"Unexpected end of JSON\n // input\" — give them an actionable error instead.\n const r = result as { command_id?: string; submission_id?: string } | null | undefined;\n if (!r || typeof r.command_id !== 'string') {\n // Do not use words like \"rejected\"/\"denied\"/\"cancelled\" here — the\n // core error mapper auto-classifies those as UserRejectedError and\n // replaces the message, which would hide the actionable hint below.\n throw new Error(\n `Loop Wallet submitTransaction returned an unexpected response shape. `\n + `Expected { command_id, submission_id } but received ${safePreview(r)}. `\n + `Likely the popup closed before confirmation or the wallet server returned an error payload. `\n + `Ensure the Daml template ID uses the fully-qualified package-prefixed form `\n + `(e.g. '#splice-amulet:Splice.Amulet:Amulet') — Loop does not accept the short Canton form.`,\n );\n }\n\n return {\n transactionHash: toTransactionHash(r.command_id),\n submittedAt: Date.now(),\n commandId: r.command_id,\n updateId: r.submission_id ?? r.command_id,\n };\n } catch (err) {\n throw mapUnknownErrorToPartyLayerError(err, {\n walletId: this.walletId,\n phase: 'submitTransaction',\n transport: 'popup',\n details: {\n sessionId: session.sessionId,\n },\n });\n }\n }\n\n /**\n * Ledger API endpoints that Loop SDK can fulfill via native methods.\n *\n * Loop SDK does not expose a generic Ledger API proxy. Instead, it\n * provides purpose-built methods (getActiveContracts, getHolding,\n * submitTransaction, etc.) that we map to Canton Ledger API endpoints.\n *\n * Supported endpoints:\n * - POST /v2/state/acs — via getActiveContracts()\n * - POST /v2/state/active-contracts — alias for /v2/state/acs\n * - GET /v2/state/acs/active-contracts — unfiltered, via getActiveContracts()\n * - POST /v2/commands/submit — via submitTransaction()\n * - POST /v2/commands/submit-and-wait — via submitAndWaitForTransaction()\n * - POST /v2/commands/submit-and-wait-for-transaction — alias\n *\n * Unsupported endpoints throw CapabilityNotSupportedError with a\n * message listing the supported routes.\n */\n async ledgerApi(\n ctx: AdapterContext,\n session: Session,\n params: LedgerApiParams,\n ): Promise {\n try {\n if (!this.currentProvider) {\n throw new Error('Not connected to Loop Wallet');\n }\n\n const { requestMethod, resource } = params;\n // Loop's SDK handlers parse a JSON string body; the SDK boundary now also\n // accepts an object, so coerce to the string form Loop expects.\n const body = ledgerApiBodyToString(params.body);\n const route = `${requestMethod.toUpperCase()} ${resource}`;\n\n ctx.logger.debug('Loop ledgerApi request', {\n sessionId: session.sessionId,\n route,\n });\n\n // Route to the appropriate Loop SDK method\n if (this.isAcsRoute(requestMethod, resource)) {\n return this.handleAcsQuery(body);\n }\n\n if (this.isSubmitRoute(requestMethod, resource)) {\n return this.handleSubmitCommand(resource, body);\n }\n\n // Unsupported endpoint\n throw new CapabilityNotSupportedError(\n this.walletId,\n `ledgerApi endpoint \"${route}\" is not supported by Loop wallet. ` +\n 'Supported: POST /v2/state/acs, GET /v2/state/acs/active-contracts, ' +\n 'POST /v2/commands/submit, POST /v2/commands/submit-and-wait. ' +\n 'For full Ledger API access, use Console or Nightly wallet.',\n );\n } catch (err) {\n throw mapUnknownErrorToPartyLayerError(err, {\n walletId: this.walletId,\n phase: 'ledgerApi',\n transport: 'popup',\n details: { sessionId: session.sessionId },\n });\n }\n }\n\n /** Check if the request targets the ACS query endpoint */\n private isAcsRoute(method: string, resource: string): boolean {\n const m = method.toUpperCase();\n const normalized = resource.replace(/\\/+$/, '');\n // POST /v2/state/acs — filtered query (Canton Ledger API standard)\n // POST /v2/state/active-contracts — alias\n // GET /v2/state/acs/active-contracts — unfiltered fetch of all contracts\n if (m === 'POST') {\n return normalized === '/v2/state/acs'\n || normalized === '/v2/state/active-contracts';\n }\n if (m === 'GET') {\n return normalized === '/v2/state/acs/active-contracts';\n }\n return false;\n }\n\n /** Check if the request targets a command submission endpoint */\n private isSubmitRoute(method: string, resource: string): boolean {\n if (method.toUpperCase() !== 'POST') return false;\n const normalized = resource.replace(/\\/+$/, '');\n return normalized === '/v2/commands/submit'\n || normalized === '/v2/commands/submit-and-wait'\n || normalized === '/v2/commands/submit-and-wait-for-transaction';\n }\n\n /**\n * Handle POST /v2/state/acs via Loop SDK's getActiveContracts().\n *\n * The Canton Ledger API ACS request body contains a filter with template IDs.\n * We extract the first templateId from the filter and pass it to the Loop SDK.\n * The response is wrapped to match the Canton Ledger API shape.\n *\n * Important: Loop SDK expects fully-qualified Daml template IDs that include\n * the package name prefix (e.g., '#splice-amulet:Splice.Amulet:Amulet'),\n * not the short Canton Ledger API format ('Splice.Amulet:Amulet').\n */\n private async handleAcsQuery(body?: string): Promise {\n const provider = this.currentProvider!;\n\n // Parse the request body to extract template filter\n let templateId: string | undefined;\n let interfaceId: string | undefined;\n\n if (body) {\n try {\n const parsed = JSON.parse(body) as {\n filter?: {\n filtersByParty?: Record;\n };\n }>;\n };\n templateId?: string;\n interfaceId?: string;\n };\n\n // Extract from Canton Ledger API filter format\n if (parsed.filter?.filtersByParty) {\n const partyFilters = Object.values(parsed.filter.filtersByParty);\n for (const pf of partyFilters) {\n const templates = pf.inclusive?.templateFilters;\n if (templates && templates.length > 0) {\n templateId = templates[0].templateId;\n interfaceId = templates[0].interfaceId;\n break;\n }\n }\n }\n\n // Also accept direct templateId/interfaceId (simplified format)\n if (!templateId && parsed.templateId) {\n templateId = parsed.templateId;\n }\n if (!interfaceId && parsed.interfaceId) {\n interfaceId = parsed.interfaceId;\n }\n } catch {\n // If body is not valid JSON, call without filters\n }\n }\n\n // Call Loop SDK's getActiveContracts() with descriptive error context\n let result: unknown;\n try {\n result = await provider.getActiveContracts({\n templateId,\n interfaceId,\n });\n } catch (err) {\n const filterDesc = templateId\n ? `templateId=\"${templateId}\"`\n : interfaceId\n ? `interfaceId=\"${interfaceId}\"`\n : 'no filter (unfiltered query)';\n const hint = !templateId && !interfaceId\n ? ' Loop wallet may not support unfiltered ACS queries — try providing a templateId or interfaceId.'\n : templateId && !templateId.startsWith('#')\n ? ` Loop wallet expects fully-qualified Daml template IDs with a package name prefix`\n + ` (e.g., '#splice-amulet:Splice.Amulet:Amulet'), not the short Canton format`\n + ` ('Splice.Amulet:Amulet').`\n : '';\n // Structured Loop errors (timeout/auth/limit) get a stable code; everything\n // else keeps the descriptive query context. Original error preserved as cause.\n const structured = mapLoopStructuredError(err, { operation: `getActiveContracts (${filterDesc})` });\n if (structured) throw structured;\n throw new Error(\n `Loop getActiveContracts() failed for ${filterDesc}.${hint}`\n + ` Original error: ${err instanceof Error ? err.message : String(err)}`,\n { cause: err as Error },\n );\n }\n\n // Normalize the Loop SDK response — it may be a plain array or an\n // object with a known contracts key.\n const contracts = extractContracts(result);\n const acsResponse = {\n activeContracts: contracts,\n workflowId: '',\n };\n\n return { response: JSON.stringify(acsResponse) };\n }\n\n /**\n * Handle POST /v2/commands/submit[-and-wait] via Loop SDK's\n * submitTransaction() or submitAndWaitForTransaction().\n */\n private async handleSubmitCommand(resource: string, body?: string): Promise {\n const provider = this.currentProvider!;\n\n // Validate body. Empty or whitespace-only body used to hit JSON.parse\n // directly and produce \"Unexpected end of JSON input\" with no context.\n if (!body || body.trim().length === 0) {\n throw new Error(\n `Command submission requires a request body with at least a 'commands' field. `\n + `Example: { commands: [...], commandId, actAs, readAs }.`,\n );\n }\n\n let payload: Record;\n try {\n payload = JSON.parse(body) as Record;\n } catch (err) {\n const preview = body.length > 120 ? body.slice(0, 120) + '...' : body;\n throw new Error(\n `Command submission body is not valid JSON: ${(err as Error).message}. `\n + `Received body (first 120 chars): ${JSON.stringify(preview)}. `\n + `Use JSON.stringify(payload) when calling ledgerApi.`,\n );\n }\n\n const normalized = resource.replace(/\\/+$/, '');\n const waitForResult = normalized.includes('wait');\n\n // The adapter is a passthrough: `payload` is opaque JSON whose shape is the\n // caller's responsibility, so cast to the SDK's payload type at the boundary.\n const submitPayload = payload as unknown as LoopSubmitPayload;\n let result: unknown;\n try {\n result = waitForResult\n ? await provider.submitAndWaitForTransaction(submitPayload)\n : await provider.submitTransaction(submitPayload);\n } catch (err) {\n const op = waitForResult ? 'submitAndWaitForTransaction' : 'submitTransaction';\n const hint = this.templateIdHint(payload);\n // Structured Loop errors (timeout/auth/limit/reject) get a stable code so a\n // consumer can react (retry vs reconnect vs top-up); everything else keeps\n // the descriptive message. Original error preserved as cause in both paths.\n const structured = mapLoopStructuredError(err, { operation: `Loop Wallet ${op}`, hint });\n if (structured) throw structured;\n const message = (err as Error)?.message || 'Loop SDK submission failed without an error message';\n throw new Error(\n `Loop Wallet ${op} failed: ${message}.${hint} `\n + `Original error preserved as cause.`,\n { cause: err as Error },\n );\n }\n\n // Loop resolves sendRequest with response.payload — which can be\n // undefined / null when the wallet sends a malformed or empty\n // TRANSACTION_COMPLETED frame. JSON.stringify(undefined) returns the\n // VALUE undefined (not \"undefined\"), so a naive `response: JSON.stringify(result)`\n // leaves the response key missing from the returned object. Downstream\n // consumers then do JSON.parse(result.response) which blows up with\n // \"Unexpected token u\" / \"Unexpected end of JSON input\". Normalize.\n if (result === undefined || result === null) {\n const hint = this.templateIdHint(payload);\n // Avoid \"rejected\"/\"denied\"/\"cancelled\" here so the core error\n // mapper doesn't classify this as UserRejectedError and drop the hint.\n throw new Error(\n `Loop Wallet ${waitForResult ? 'submitAndWaitForTransaction' : 'submitTransaction'} `\n + `resolved with an empty response. The popup may have closed before confirmation, or the wallet server `\n + `returned an unexpected frame.${hint}`,\n );\n }\n\n return { response: JSON.stringify(result) };\n }\n\n /**\n * Build a hint string if the developer passed a short-form Canton\n * template ID OR used the legacy pre-Token-Standard Amulet_Transfer\n * choice. Both patterns produce \"Execute Unknown on Unknown\" in Loop's\n * UI because Canton moved transfers to CIP-56 TransferFactory in 2025/2026.\n */\n private templateIdHint(payload: Record): string {\n try {\n const commands = payload.commands;\n if (!Array.isArray(commands)) return '';\n for (const cmd of commands as Array>) {\n // v2 JSON Ledger API uses PascalCase ExerciseCommand; legacy shape used lowercase.\n // Interface exercises still go through ExerciseCommand with the interfaceId\n // in the templateId field — we don't need to distinguish, just inspect.\n const exercise = ((cmd?.ExerciseCommand || cmd?.exerciseCommand || cmd?.exercise) as\n | Record\n | undefined);\n const create = ((cmd?.CreateCommand || cmd?.createCommand || cmd?.create) as\n | Record\n | undefined);\n const raw = (exercise?.templateId ?? create?.templateId) as string | undefined;\n const choice = exercise?.choice as string | undefined;\n\n // CIP-56 migration hint: Amulet_Transfer exercised directly on the\n // Amulet template is the legacy path and is rejected by Canton today.\n if (\n choice === 'Amulet_Transfer'\n && typeof raw === 'string'\n && raw.includes('Splice.Amulet:Amulet')\n ) {\n return (\n ` The command exercises 'Amulet_Transfer' directly on the Amulet template — that's the `\n + `legacy (pre-CIP-56) path and Canton no longer accepts it, which is why Loop's UI shows `\n + `\"Execute Unknown on Unknown\". Use the Token Standard flow: exercise `\n + `'TransferFactory_Transfer' by interface on a TransferFactory contract `\n + `(interfaceId '#splice-api-token-transfer-instruction-v1:Splice.Api.Token.TransferInstructionV1:TransferFactory'). `\n + `See https://partylayer.xyz/docs/token-transfers for the canonical flow.`\n );\n }\n\n if (typeof raw === 'string' && raw.length > 0 && !raw.startsWith('#')) {\n return (\n ` The command uses templateId=\"${raw}\" which is the short Canton form; Loop requires `\n + `the fully-qualified Daml form (e.g. '#splice-amulet:Splice.Amulet:Amulet').`\n );\n }\n }\n } catch {\n // best-effort; never throw from a hint helper\n }\n return '';\n }\n\n /**\n * Map a PartyLayer network ID to the Loop SDK network format.\n *\n * Loop serves only local / devnet / mainnet. Unsupported networks (e.g.\n * testnet — Loop has none) throw a clear error at connect (via the adapter's\n * existing error path) instead of being silently substituted to the wrong\n * network.\n */\n private mapNetworkToLoop(network: string): 'local' | 'devnet' | 'mainnet' {\n if (network === 'local') return 'local';\n if (network === 'devnet') return 'devnet';\n if (network === 'mainnet') return 'mainnet';\n throw new Error(\n `Loop wallet does not support the \"${network}\" network (supported: local, devnet, mainnet).`,\n );\n }\n}\n\n/**\n * Extract a contracts array from the Loop SDK response.\n *\n * The SDK's getActiveContracts() may return:\n * - A plain array of contract objects (most common)\n * - An object with a known key containing the array\n *\n * This helper normalizes all shapes to a flat array.\n */\n/**\n * Format an unknown value into a short human-readable preview for\n * inclusion in error messages. Keeps output small so long payloads\n * don't flood the console.\n */\nfunction safePreview(value: unknown): string {\n if (value === undefined) return 'undefined';\n if (value === null) return 'null';\n try {\n const s = JSON.stringify(value);\n if (typeof s !== 'string') return String(value);\n return s.length > 200 ? s.slice(0, 200) + '...' : s;\n } catch {\n return String(value);\n }\n}\n\nfunction extractContracts(result: unknown): unknown[] {\n if (Array.isArray(result)) {\n return result;\n }\n if (result && typeof result === 'object') {\n const obj = result as Record;\n // Try common response wrapper keys\n for (const key of ['active_contracts', 'activeContracts', 'contracts', 'result']) {\n if (Array.isArray(obj[key])) {\n return obj[key] as unknown[];\n }\n }\n }\n return [];\n}\n"]}