@metamask/snaps-rpc-methods
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MetaMask Snaps JSON-RPC method implementations
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{"version":3,"file":"getCurrencyRate.mjs","sourceRoot":"","sources":["../../src/permitted/getCurrencyRate.ts"],"names":[],"mappings":"AAEA,OAAO,EAAE,SAAS,EAAE,6BAA6B;AAQjD,OAAO,EAAE,QAAQ,EAAsB,8BAA8B;AACrE,OAAO,EAAE,WAAW,EAAE,MAAM,EAAE,MAAM,EAAE,KAAK,EAAE,8BAA8B;AAK3E,MAAM,SAAS,GAAkD;IAC/D,eAAe,EAAE,IAAI;CACtB,CAAC;AAWF,MAAM,CAAC,MAAM,sBAAsB,GAI/B;IACF,WAAW,EAAE,CAAC,sBAAsB,CAAC;IACrC,cAAc,EAAE,gCAAgC;IAChD,SAAS;CACV,CAAC;AAEF,MAAM,+BAA+B,GAAG,MAAM,CAAC;IAC7C,QAAQ,EAAE,KAAK,CAAC,CAAC,QAAQ,CAAC,KAAK,CAAC,CAAC,CAAC;CACnC,CAAC,CAAC;AAOH;;;;;;;;;;;GAWG;AACH,SAAS,gCAAgC,CACvC,GAA8C,EAC9C,GAAkD,EAClD,KAAc,EACd,GAA6B,EAC7B,EAAE,eAAe,EAA8B;IAE/C,MAAM,EAAE,MAAM,EAAE,GAAG,GAAG,CAAC;IAEvB,IAAI,CAAC;QACH,MAAM,eAAe,GAAG,kBAAkB,CAAC,MAAM,CAAC,CAAC;QAEnD,MAAM,EAAE,QAAQ,EAAE,gBAAgB,EAAE,GAAG,eAAe,CAAC;QAEvD,GAAG,CAAC,MAAM,GAAG,eAAe,CAAC,gBAAgB,CAAC,IAAI,IAAI,CAAC;IACzD,CAAC;IAAC,OAAO,KAAK,EAAE,CAAC;QACf,OAAO,GAAG,CAAC,KAAK,CAAC,CAAC;IACpB,CAAC;IAED,OAAO,GAAG,EAAE,CAAC;AACf,CAAC;AAED;;;;;;GAMG;AACH,SAAS,kBAAkB,CAAC,MAAe;IACzC,IAAI,CAAC;QACH,OAAO,MAAM,CAAC,MAAM,EAAE,+BAA+B,CAAC,CAAC;IACzD,CAAC;IAAC,OAAO,KAAK,EAAE,CAAC;QACf,IAAI,KAAK,YAAY,WAAW,EAAE,CAAC;YACjC,MAAM,SAAS,CAAC,aAAa,CAAC;gBAC5B,OAAO,EAAE,mBAAmB,KAAK,CAAC,OAAO,GAAG;aAC7C,CAAC,CAAC;QACL,CAAC;QACD,0BAA0B;QAC1B,MAAM,SAAS,CAAC,QAAQ,EAAE,CAAC;IAC7B,CAAC;AACH,CAAC","sourcesContent":["import type { JsonRpcEngineEndCallback } from '@metamask/json-rpc-engine';\nimport type { PermittedHandlerExport } from '@metamask/permission-controller';\nimport { rpcErrors } from '@metamask/rpc-errors';\nimport type {\n AvailableCurrency,\n CurrencyRate,\n GetCurrencyRateParams,\n GetCurrencyRateResult,\n JsonRpcRequest,\n} from '@metamask/snaps-sdk';\nimport { currency, type InferMatching } from '@metamask/snaps-utils';\nimport { StructError, create, object, union } from '@metamask/superstruct';\nimport type { PendingJsonRpcResponse } from '@metamask/utils';\n\nimport type { MethodHooksObject } from '../utils';\n\nconst hookNames: MethodHooksObject<GetCurrencyRateMethodHooks> = {\n getCurrencyRate: true,\n};\n\nexport type GetCurrencyRateMethodHooks = {\n /**\n * @param currency - The currency symbol.\n * Currently only 'btc' is supported.\n * @returns The {@link CurrencyRate} object.\n */\n getCurrencyRate: (currency: AvailableCurrency) => CurrencyRate | undefined;\n};\n\nexport const getCurrencyRateHandler: PermittedHandlerExport<\n GetCurrencyRateMethodHooks,\n GetCurrencyRateParameters,\n GetCurrencyRateResult\n> = {\n methodNames: ['snap_getCurrencyRate'],\n implementation: getGetCurrencyRateImplementation,\n hookNames,\n};\n\nconst GetCurrencyRateParametersStruct = object({\n currency: union([currency('btc')]),\n});\n\nexport type GetCurrencyRateParameters = InferMatching<\n typeof GetCurrencyRateParametersStruct,\n GetCurrencyRateParams\n>;\n\n/**\n * The `snap_getCurrencyRate` method implementation.\n *\n * @param req - The JSON-RPC request object.\n * @param res - The JSON-RPC response object.\n * @param _next - The `json-rpc-engine` \"next\" callback. Not used by this\n * function.\n * @param end - The `json-rpc-engine` \"end\" callback.\n * @param hooks - The RPC method hooks.\n * @param hooks.getCurrencyRate - The function to get the rate.\n * @returns Nothing.\n */\nfunction getGetCurrencyRateImplementation(\n req: JsonRpcRequest<GetCurrencyRateParameters>,\n res: PendingJsonRpcResponse<GetCurrencyRateResult>,\n _next: unknown,\n end: JsonRpcEngineEndCallback,\n { getCurrencyRate }: GetCurrencyRateMethodHooks,\n): void {\n const { params } = req;\n\n try {\n const validatedParams = getValidatedParams(params);\n\n const { currency: selectedCurrency } = validatedParams;\n\n res.result = getCurrencyRate(selectedCurrency) ?? null;\n } catch (error) {\n return end(error);\n }\n\n return end();\n}\n\n/**\n * Validate the getCurrencyRate method `params` and returns them cast to the correct\n * type. Throws if validation fails.\n *\n * @param params - The unvalidated params object from the method request.\n * @returns The validated getCurrencyRate method parameter object.\n */\nfunction getValidatedParams(params: unknown): GetCurrencyRateParameters {\n try {\n return create(params, GetCurrencyRateParametersStruct);\n } catch (error) {\n if (error instanceof StructError) {\n throw rpcErrors.invalidParams({\n message: `Invalid params: ${error.message}.`,\n });\n }\n /* istanbul ignore next */\n throw rpcErrors.internal();\n }\n}\n"]}