@metamask/snaps-utils
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A collection of utilities for MetaMask Snaps
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{ getErrorMessage } from '@metamask/snaps-sdk';\nimport type { Json } from '@metamask/utils';\nimport { assert, isPlainObject } from '@metamask/utils';\nimport { promises as fs } from 'fs';\nimport pathUtils from 'path';\n\nimport type { SnapManifest } from './validation';\nimport type { ValidatorResults } from './validator';\nimport { hasFixes, runValidators } from './validator';\nimport type { ValidatorMeta, ValidatorReport } from './validator-types';\nimport { deepClone } from '../deep-clone';\nimport { readJsonFile } from '../fs';\nimport { parseJson } from '../json';\nimport type { SnapFiles, UnvalidatedSnapFiles } from '../types';\nimport { NpmSnapFileNames } from '../types';\nimport { readVirtualFile, VirtualFile } from '../virtual-file/node';\n\nconst MANIFEST_SORT_ORDER: Record<keyof SnapManifest, number> = {\n $schema: 1,\n version: 2,\n description: 3,\n proposedName: 4,\n repository: 5,\n source: 6,\n initialConnections: 7,\n initialPermissions: 8,\n platformVersion: 9,\n manifestVersion: 10,\n};\n\nexport type CheckManifestReport = Omit<ValidatorReport, 'fix'> & {\n wasFixed?: boolean;\n};\n\n/**\n * The result from the `checkManifest` function.\n *\n * @property manifest - The fixed manifest object.\n * @property updated - Whether the manifest was written and updated.\n */\nexport type CheckManifestResult = {\n files?: SnapFiles;\n updated: boolean;\n reports: CheckManifestReport[];\n};\n\nexport type WriteFileFunction = (path: string, data: string) => Promise<void>;\n\n/**\n * Validates a snap.manifest.json file. Attempts to fix the manifest and write\n * the fixed version to disk if `writeManifest` is true. Throws if validation\n * fails.\n *\n * @param basePath - The path to the folder with the manifest files.\n * @param options - Additional options for the function.\n * @param options.sourceCode - The source code of the Snap.\n * @param options.writeFileFn - The function to use to write the manifest to disk.\n * @param options.updateAndWriteManifest - Whether to auto-magically try to fix errors and then write the manifest to disk.\n * @returns Whether the manifest was updated, and an array of warnings that\n * were encountered during processing of the manifest files.\n */\nexport async function checkManifest(\n basePath: string,\n {\n updateAndWriteManifest = true,\n sourceCode,\n writeFileFn = fs.writeFile,\n }: {\n updateAndWriteManifest?: boolean;\n sourceCode?: string;\n writeFileFn?: WriteFileFunction;\n } = {},\n): Promise<CheckManifestResult> {\n const manifestPath = pathUtils.join(basePath, NpmSnapFileNames.Manifest);\n const manifestFile = await readJsonFile(manifestPath);\n const unvalidatedManifest = manifestFile.result;\n\n const packageFile = await readJsonFile(\n pathUtils.join(basePath, NpmSnapFileNames.PackageJson),\n );\n\n const auxiliaryFilePaths = getSnapFilePaths(\n unvalidatedManifest,\n (manifest) => manifest?.source?.files,\n );\n\n const localizationFilePaths = getSnapFilePaths(\n unvalidatedManifest,\n (manifest) => manifest?.source?.locales,\n );\n const localizationFiles =\n (await getSnapFiles(basePath, localizationFilePaths)) ?? [];\n for (const localization of localizationFiles) {\n try {\n localization.result = parseJson(localization.toString());\n } catch (error) {\n assert(error instanceof SyntaxError, error);\n throw new Error(\n `Failed to parse localization file \"${localization.path}\" as JSON.`,\n );\n }\n }\n\n const snapFiles: UnvalidatedSnapFiles = {\n manifest: manifestFile,\n packageJson: packageFile,\n sourceCode: await getSnapSourceCode(\n basePath,\n unvalidatedManifest,\n sourceCode,\n ),\n svgIcon: await getSnapIcon(basePath, unvalidatedManifest),\n // Intentionally pass null as the encoding here since the files may be binary\n auxiliaryFiles:\n (await getSnapFiles(basePath, auxiliaryFilePaths, null)) ?? [],\n localizationFiles,\n };\n\n const validatorResults = await runValidators(snapFiles);\n let manifestResults: CheckManifestResult = {\n updated: false,\n files: validatorResults.files,\n reports: validatorResults.reports,\n };\n\n if (updateAndWriteManifest && hasFixes(manifestResults)) {\n const fixedResults = await runFixes(validatorResults);\n\n if (fixedResults.updated) {\n manifestResults = fixedResults;\n\n assert(manifestResults.files);\n\n try {\n await writeFileFn(\n pathUtils.join(basePath, NpmSnapFileNames.Manifest),\n manifestResults.files.manifest.toString(),\n );\n } catch (error) {\n // Note: This error isn't pushed to the errors array, because it's not an\n // error in the manifest itself.\n throw new Error(\n `Failed to update \"snap.manifest.json\": ${getErrorMessage(error)}`,\n );\n }\n }\n }\n\n return manifestResults;\n}\n\n/**\n * Run the algorithm for automatically fixing errors in manifest.\n *\n * The algorithm updates the manifest by fixing all fixable problems,\n * and then run validation again to check if the new manifest is now correct.\n * If not correct, the algorithm will use the manifest from previous iteration\n * and try again `MAX_ATTEMPTS` times to update it before bailing and\n * resulting in failure.\n *\n * @param results - Results of the initial run of validation.\n * @param rules - Optional list of rules to run the fixes with.\n * @returns The updated manifest and whether it was updated.\n */\nexport async function runFixes(\n results: ValidatorResults,\n rules?: ValidatorMeta[],\n): Promise<CheckManifestResult> {\n let shouldRunFixes = true;\n const MAX_ATTEMPTS = 10;\n\n assert(results.files);\n\n let fixResults: ValidatorResults = results;\n assert(fixResults.files);\n fixResults.files.manifest = fixResults.files.manifest.clone();\n\n for (\n let attempts = 1;\n shouldRunFixes && attempts <= MAX_ATTEMPTS;\n attempts++\n ) {\n assert(fixResults.files);\n\n let manifest = fixResults.files.manifest.result;\n\n const fixable = fixResults.reports.filter((report) => report.fix);\n for (const report of fixable) {\n assert(report.fix);\n ({ manifest } = await report.fix({ manifest }));\n }\n\n fixResults.files.manifest.value = `${JSON.stringify(\n getWritableManifest(manifest),\n null,\n 2,\n )}\\n`;\n fixResults.files.manifest.result = manifest;\n\n fixResults = await runValidators(fixResults.files, rules);\n shouldRunFixes = hasFixes(fixResults);\n }\n\n const initialReports: (CheckManifestReport & ValidatorReport)[] = deepClone(\n results.reports,\n );\n\n // Was fixed\n if (!shouldRunFixes) {\n for (const report of initialReports) {\n if (report.fix) {\n report.wasFixed = true;\n delete report.fix;\n }\n }\n\n return {\n files: fixResults.files,\n updated: true,\n reports: initialReports,\n };\n }\n\n for (const report of initialReports) {\n delete report.fix;\n }\n\n return {\n files: results.files,\n updated: false,\n reports: initialReports,\n };\n}\n\n/**\n * Given an unvalidated Snap manifest, attempts to extract the location of the\n * bundle source file location and read the file.\n *\n * @param basePath - The path to the folder with the manifest files.\n * @param manifest - The unvalidated Snap manifest file contents.\n * @param sourceCode - Override source code for plugins.\n * @returns The contents of the bundle file, if any.\n */\nexport async function getSnapSourceCode(\n basePath: string,\n manifest: Json,\n sourceCode?: string,\n): Promise<VirtualFile | undefined> {\n if (!isPlainObject(manifest)) {\n return undefined;\n }\n\n const sourceFilePath = (manifest as Partial<SnapManifest>).source?.location\n ?.npm?.filePath;\n\n if (!sourceFilePath) {\n return undefined;\n }\n\n if (sourceCode) {\n return new VirtualFile({\n path: pathUtils.join(basePath, sourceFilePath),\n value: sourceCode,\n });\n }\n\n try {\n const virtualFile = await readVirtualFile(\n pathUtils.join(basePath, sourceFilePath),\n 'utf8',\n );\n return virtualFile;\n } catch (error) {\n throw new Error(\n `Failed to read snap bundle file: ${getErrorMessage(error)}`,\n );\n }\n}\n\n/**\n * Given an unvalidated Snap manifest, attempts to extract the location of the\n * icon and read the file.\n *\n * @param basePath - The path to the folder with the manifest files.\n * @param manifest - The unvalidated Snap manifest file contents.\n * @returns The contents of the icon, if any.\n */\nexport async function getSnapIcon(\n basePath: string,\n manifest: Json,\n): Promise<VirtualFile | undefined> {\n if (!isPlainObject(manifest)) {\n return undefined;\n }\n\n const iconPath = (manifest as Partial<SnapManifest>).source?.location?.npm\n ?.iconPath;\n\n if (!iconPath) {\n return undefined;\n }\n\n try {\n const virtualFile = await readVirtualFile(\n pathUtils.join(basePath, iconPath),\n 'utf8',\n );\n return virtualFile;\n } catch (error) {\n throw new Error(`Failed to read snap icon file: ${getErrorMessage(error)}`);\n }\n}\n\n/**\n * Get an array of paths from an unvalidated Snap manifest.\n *\n * @param manifest - The unvalidated Snap manifest file contents.\n * @param selector - A function that returns the paths to the files.\n * @returns The paths to the files, if any.\n */\nexport function getSnapFilePaths(\n manifest: Json,\n selector: (manifest: Partial<SnapManifest>) => string[] | undefined,\n) {\n if (!isPlainObject(manifest)) {\n return undefined;\n }\n\n const snapManifest = manifest as Partial<SnapManifest>;\n const paths = selector(snapManifest);\n\n if (!Array.isArray(paths)) {\n return undefined;\n }\n\n return paths;\n}\n\n/**\n * Given an unvalidated Snap manifest, attempts to extract the files with the\n * given paths and read them.\n *\n * @param basePath - The path to the folder with the manifest files.\n * @param paths - The paths to the files.\n * @param encoding - An optional encoding to pass down to readVirtualFile.\n * @returns A list of auxiliary files and their contents, if any.\n */\nexport async function getSnapFiles(\n basePath: string,\n paths: string[] | undefined,\n encoding: BufferEncoding | null = 'utf8',\n): Promise<VirtualFile[] | undefined> {\n if (!paths) {\n return undefined;\n }\n\n try {\n return await Promise.all(\n paths.map(async (filePath) =>\n readVirtualFile(pathUtils.join(basePath, filePath), encoding),\n ),\n );\n } catch (error) {\n throw new Error(`Failed to read snap files: ${getErrorMessage(error)}`);\n }\n}\n\n/**\n * Sorts the given manifest in our preferred sort order and removes the\n * `repository` field if it is falsy (it may be `null`).\n *\n * @param manifest - The manifest to sort and modify.\n * @returns The disk-ready manifest.\n */\nexport function getWritableManifest(manifest: SnapManifest): SnapManifest {\n const { repository, ...remaining } = manifest;\n\n const keys = Object.keys(\n repository ? { ...remaining, repository } : remaining,\n ) as (keyof SnapManifest)[];\n\n const writableManifest = keys\n .sort((a, b) => MANIFEST_SORT_ORDER[a] - MANIFEST_SORT_ORDER[b])\n .reduce<Partial<SnapManifest>>(\n (result, key) => ({\n ...result,\n [key]: manifest[key],\n }),\n {},\n );\n\n return writableManifest as SnapManifest;\n}\n"]}