@metamask/snaps-utils
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A collection of utilities for MetaMask Snaps
1 lines • 28.8 kB
Source Map (JSON)
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type { CaipAccountId, Component } from '@metamask/snaps-sdk';\nimport { NodeType } from '@metamask/snaps-sdk';\nimport type {\n BoldChildren,\n GenericSnapElement,\n ItalicChildren,\n JSXElement,\n LinkElement,\n Nestable,\n RowChildren,\n SnapNode,\n StandardFormattingElement,\n TextChildren,\n} from '@metamask/snaps-sdk/jsx';\nimport {\n Italic,\n Link,\n Bold,\n Row,\n Text,\n Field,\n Image,\n Input,\n Heading,\n Form,\n Divider,\n Spinner,\n Copyable,\n Box,\n Button,\n Address,\n} from '@metamask/snaps-sdk/jsx';\nimport {\n assert,\n assertExhaustive,\n hasProperty,\n isPlainObject,\n} from '@metamask/utils';\nimport { lexer, walkTokens } from 'marked';\nimport type { Token, Tokens } from 'marked';\n\nimport type { InternalAccount } from './account';\nimport type { Snap } from './snaps';\nimport { parseMetaMaskUrl } from './url';\n\nconst MAX_TEXT_LENGTH = 50_000; // 50 kb\nconst ALLOWED_PROTOCOLS = ['https:', 'mailto:', 'metamask:'];\n\n/**\n * Get the button variant from a legacy button component variant.\n *\n * @param variant - The legacy button component variant.\n * @returns The button variant.\n */\nfunction getButtonVariant(variant?: 'primary' | 'secondary' | undefined) {\n switch (variant) {\n case 'primary':\n return 'primary';\n case 'secondary':\n return 'destructive';\n default:\n return undefined;\n }\n}\n\n/**\n * Get the children of a JSX element. If there is only one child, the child is\n * returned directly. Otherwise, the children are returned as an array.\n *\n * @param elements - The JSX elements.\n * @returns The child or children.\n */\nfunction getChildren<Type>(elements: Type[]) {\n if (elements.length === 1) {\n return elements[0];\n }\n\n return elements;\n}\n\n/**\n * Get the text of a link token.\n *\n * @param token - The link token.\n * @returns The text of the link token.\n */\nfunction getLinkText(token: Tokens.Link | Tokens.Generic) {\n if (token.tokens && token.tokens.length > 0) {\n return getChildren(token.tokens.flatMap(getTextChildFromToken));\n }\n\n return token.href;\n}\n\n/**\n * Get the text child from a list of markdown tokens.\n *\n * @param tokens - The markdown tokens.\n * @returns The text child.\n */\nfunction getTextChildFromTokens(tokens: Token[]) {\n return getChildren(tokens.flatMap(getTextChildFromToken));\n}\n\n/**\n * Get the text child from a markdown token.\n *\n * @param token - The markdown token.\n * @returns The text child.\n */\nfunction getTextChildFromToken(token: Token): TextChildren {\n switch (token.type) {\n case 'link': {\n return <Link href={token.href} children={getLinkText(token)} />;\n }\n\n case 'text':\n return token.text;\n\n case 'strong':\n return (\n <Bold>\n {\n getTextChildFromTokens(\n // Due to the way `marked` is typed, `token.tokens` can be\n // `undefined`, but it's a required field of `Tokens.Bold`, so we\n // can safely cast it to `Token[]`.\n token.tokens as Token[],\n ) as BoldChildren\n }\n </Bold>\n );\n\n case 'em':\n return (\n <Italic>\n {\n getTextChildFromTokens(\n // Due to the way `marked` is typed, `token.tokens` can be\n // `undefined`, but it's a required field of `Tokens.Bold`, so we\n // can safely cast it to `Token[]`.\n token.tokens as Token[],\n ) as ItalicChildren\n }\n </Italic>\n );\n\n default:\n return null;\n }\n}\n\n/**\n * Get all text children from a markdown string.\n *\n * @param value - The markdown string.\n * @returns The text children.\n */\nexport function getTextChildren(\n value: string,\n): (string | StandardFormattingElement | LinkElement)[] {\n const rootTokens = lexer(value, { gfm: false });\n const children: (string | StandardFormattingElement | LinkElement | null)[] =\n [];\n\n // TODO: Either fix this lint violation or explain why it's necessary to\n // ignore.\n // eslint-disable-next-line @typescript-eslint/no-floating-promises\n walkTokens(rootTokens, (token) => {\n if (token.type === 'paragraph') {\n if (children.length > 0) {\n children.push('\\n\\n');\n }\n\n const { tokens } = token as Tokens.Paragraph;\n // We do not need to consider nesting deeper than 1 level here and we can therefore cast.\n children.push(\n ...(tokens.flatMap(getTextChildFromToken) as (\n | string\n | StandardFormattingElement\n | LinkElement\n | null\n )[]),\n );\n }\n });\n\n return children.filter((child) => child !== null) as (\n | string\n | StandardFormattingElement\n | LinkElement\n )[];\n}\n\n/**\n * Validate the text size of a component. The text size is the total length of\n * all text in the component.\n *\n * @param component - The component to validate.\n * @throws An error if the text size exceeds the maximum allowed size.\n */\nfunction validateComponentTextSize(component: Component) {\n const textSize = getTotalTextLength(component);\n assert(\n textSize <= MAX_TEXT_LENGTH,\n `The text in a Snap UI may not be larger than ${\n MAX_TEXT_LENGTH / 1000\n } kB.`,\n );\n}\n\n/**\n * Get a JSX element from a legacy UI component. This supports all legacy UI\n * components, and maps them to their JSX equivalents where possible.\n *\n * This function validates the text size of the component, but does not validate\n * the total size. The total size of the component should be validated before\n * calling this function.\n *\n * @param legacyComponent - The legacy UI component.\n * @returns The JSX element.\n */\nexport function getJsxElementFromComponent(\n legacyComponent: Component,\n): JSXElement {\n validateComponentTextSize(legacyComponent);\n\n /**\n * Get the JSX element for a component. This function is recursive and will\n * call itself for child components.\n *\n * @param component - The component to convert to a JSX element.\n * @returns The JSX element.\n */\n function getElement(component: Component) {\n switch (component.type) {\n case NodeType.Address:\n return <Address address={component.value} />;\n\n case NodeType.Button:\n return (\n <Button\n name={component.name}\n variant={getButtonVariant(component.variant)}\n type={component.buttonType}\n >\n {component.value}\n </Button>\n );\n\n case NodeType.Copyable:\n return (\n <Copyable value={component.value} sensitive={component.sensitive} />\n );\n\n case NodeType.Divider:\n return <Divider />;\n\n case NodeType.Form:\n return (\n <Form name={component.name}>\n {getChildren(component.children.map(getElement))}\n </Form>\n );\n\n case NodeType.Heading:\n return <Heading children={component.value} />;\n\n case NodeType.Image:\n // `Image` supports `alt`, but the legacy `Image` component does not.\n return <Image src={component.value} />;\n\n case NodeType.Input:\n return (\n <Field label={component.label} error={component.error}>\n <Input\n name={component.name}\n type={component.inputType}\n value={component.value}\n placeholder={component.placeholder}\n />\n </Field>\n );\n\n case NodeType.Panel:\n // `Panel` is renamed to `Box` in JSX.\n return (\n <Box children={getChildren(component.children.map(getElement))} />\n );\n\n case NodeType.Row:\n return (\n <Row label={component.label} variant={component.variant}>\n {getElement(component.value) as RowChildren}\n </Row>\n );\n\n case NodeType.Spinner:\n return <Spinner />;\n\n case NodeType.Text:\n return <Text>{getChildren(getTextChildren(component.value))}</Text>;\n\n /* istanbul ignore next 2 */\n default:\n return assertExhaustive(component);\n }\n }\n\n return getElement(legacyComponent);\n}\n\n/**\n * Extract all links from a Markdown text string using the `marked` lexer.\n *\n * @param text - The markdown text string.\n * @returns A list of URLs linked to in the string.\n */\nfunction getMarkdownLinks(text: string) {\n const tokens = lexer(text, { gfm: false });\n const links: Tokens.Link[] = [];\n\n // Walk the lexed tokens and collect all link tokens\n // TODO: Either fix this lint violation or explain why it's necessary to\n // ignore.\n // eslint-disable-next-line @typescript-eslint/no-floating-promises\n walkTokens(tokens, (token) => {\n if (token.type === 'link') {\n links.push(token as Tokens.Link);\n }\n });\n\n return links;\n}\n\n/**\n * Validate a link against the phishing list.\n *\n * @param link - The link to validate.\n * @param isOnPhishingList - The function that checks the link against the\n * phishing list.\n * @param getSnap - The function that returns a snap if installed, undefined otherwise.\n * @throws If the link is invalid.\n */\nexport function validateLink(\n link: string,\n isOnPhishingList: (url: string) => boolean,\n getSnap: (id: string) => Snap | undefined,\n) {\n try {\n const url = new URL(link);\n assert(\n ALLOWED_PROTOCOLS.includes(url.protocol),\n `Protocol must be one of: ${ALLOWED_PROTOCOLS.join(', ')}.`,\n );\n\n if (url.protocol === 'metamask:') {\n const linkData = parseMetaMaskUrl(link);\n if (linkData.snapId) {\n assert(\n getSnap(linkData.snapId),\n 'The Snap being navigated to is not installed.',\n );\n }\n } else if (url.protocol === 'mailto:') {\n const emails = url.pathname.split(',');\n for (const email of emails) {\n const hostname = email.split('@')[1];\n assert(!hostname.includes(':'));\n const href = `https://${hostname}`;\n assert(!isOnPhishingList(href), 'The specified URL is not allowed.');\n }\n\n return;\n }\n\n assert(!isOnPhishingList(url.href), 'The specified URL is not allowed.');\n } catch (error) {\n throw new Error(\n `Invalid URL: ${\n error?.code === 'ERR_ASSERTION' ? error.message : 'Unable to parse URL.'\n }`,\n );\n }\n}\n\n/**\n * Search for Markdown links in a string and checks them against the phishing\n * list.\n *\n * @param text - The text to verify.\n * @param isOnPhishingList - The function that checks the link against the\n * phishing list.\n * @param getSnap - The function that returns a snap if installed, undefined otherwise.\n * @throws If the text contains a link that is not allowed.\n */\nexport function validateTextLinks(\n text: string,\n isOnPhishingList: (url: string) => boolean,\n getSnap: (id: string) => Snap | undefined,\n) {\n const links = getMarkdownLinks(text);\n\n for (const link of links) {\n validateLink(link.href, isOnPhishingList, getSnap);\n }\n}\n\n/**\n * Validate the asset selector component.\n *\n * @param address - The address of the account to pull the assets from.\n * @param getAccountByAddress - A function to get an account by its address.\n *\n * @throws If the asset selector is invalid.\n */\nexport function validateAssetSelector(\n address: CaipAccountId,\n getAccountByAddress: (address: CaipAccountId) => InternalAccount | undefined,\n) {\n const account = getAccountByAddress(address);\n\n assert(account, `Could not find account for address: ${address}`);\n}\n\n/**\n * Walk a JSX tree and validate elements.\n * This function validates Links and AssetSelectors.\n *\n * @param node - The JSX node to walk.\n * @param hooks - The hooks to use for validation.\n * @param hooks.isOnPhishingList - The function that checks the link against the\n * phishing list.\n * @param hooks.getSnap - The function that returns a snap if installed, undefined otherwise.\n * @param hooks.getAccountByAddress - The function that returns an account by address.\n */\nexport function validateJsxElements(\n node: JSXElement,\n {\n isOnPhishingList,\n getSnap,\n getAccountByAddress,\n }: {\n isOnPhishingList: (url: string) => boolean;\n getSnap: (id: string) => Snap | undefined;\n getAccountByAddress: (\n address: CaipAccountId,\n ) => InternalAccount | undefined;\n },\n) {\n walkJsx(node, (childNode) => {\n switch (childNode.type) {\n case 'Link':\n validateLink(childNode.props.href, isOnPhishingList, getSnap);\n break;\n case 'AssetSelector':\n validateAssetSelector(\n // We assume that the address part of the CAIP-10 account ID are the same, as\n // that is already validated in the struct.\n childNode.props.addresses[0],\n getAccountByAddress,\n );\n break;\n default:\n break;\n }\n });\n}\n\n/**\n * Calculate the total length of all text in the component.\n *\n * @param component - A custom UI component.\n * @returns The total length of all text components in the component.\n */\nexport function getTotalTextLength(component: Component): number {\n const { type } = component;\n\n switch (type) {\n case NodeType.Panel:\n return component.children.reduce<number>(\n (sum, node) => sum + getTotalTextLength(node),\n 0,\n );\n\n case NodeType.Row:\n return getTotalTextLength(component.value);\n\n case NodeType.Text:\n return component.value.length;\n\n default:\n return 0;\n }\n}\n\n/**\n * Check if a JSX element has children.\n *\n * @param element - A JSX element.\n * @returns `true` if the element has children, `false` otherwise.\n */\nexport function hasChildren<Element extends JSXElement>(\n element: Element,\n): element is Element & {\n props: { children: Nestable<JSXElement | string> };\n} {\n return hasProperty(element.props, 'children');\n}\n\n/**\n * Filter a JSX child to remove `null`, `undefined`, plain booleans, and empty\n * strings.\n *\n * @param child - The JSX child to filter.\n * @returns `true` if the child is not `null`, `undefined`, a plain boolean, or\n * an empty string, `false` otherwise.\n */\nfunction filterJsxChild(child: JSXElement | string | boolean | null): boolean {\n return Boolean(child) && child !== true;\n}\n\n/**\n * Get the children of a JSX element as an array. If the element has only one\n * child, the child is returned as an array.\n *\n * @param element - A JSX element.\n * @returns The children of the element.\n */\nexport function getJsxChildren(element: JSXElement): (JSXElement | string)[] {\n if (hasChildren(element)) {\n if (Array.isArray(element.props.children)) {\n // @ts-expect-error - Each member of the union type has signatures, but\n // none of those signatures are compatible with each other.\n return element.props.children.filter(filterJsxChild).flat(Infinity);\n }\n\n if (element.props.children) {\n return [element.props.children];\n }\n }\n\n return [];\n}\n\n/**\n * Walk a JSX tree and call a callback on each node.\n *\n * @param node - The JSX node to walk.\n * @param callback - The callback to call on each node.\n * @param depth - The current depth in the JSX tree for a walk.\n * @returns The result of the callback, if any.\n */\nexport function walkJsx<Value>(\n node: JSXElement | JSXElement[],\n callback: (node: JSXElement, depth: number) => Value | undefined,\n depth = 0,\n): Value | undefined {\n if (Array.isArray(node)) {\n for (const child of node) {\n const childResult = walkJsx(child, callback, depth);\n if (childResult !== undefined) {\n return childResult;\n }\n }\n\n return undefined;\n }\n\n const result = callback(node, depth);\n if (result !== undefined) {\n return result;\n }\n\n if (\n hasProperty(node, 'props') &&\n isPlainObject(node.props) &&\n hasProperty(node.props, 'children')\n ) {\n const children = getJsxChildren(node);\n for (const child of children) {\n if (isPlainObject(child)) {\n const childResult = walkJsx(child, callback, depth + 1);\n if (childResult !== undefined) {\n return childResult;\n }\n }\n }\n }\n\n return undefined;\n}\n\n/**\n * Serialise a JSX prop to a string.\n *\n * @param prop - The JSX prop.\n * @returns The serialised JSX prop.\n */\nfunction serialiseProp(prop: unknown): string {\n if (typeof prop === 'string') {\n return `\"${prop}\"`;\n }\n\n return `{${JSON.stringify(prop)}}`;\n}\n\n/**\n * Serialise JSX props to a string.\n *\n * @param props - The JSX props.\n * @returns The serialised JSX props.\n */\nfunction serialiseProps(props: Record<string, unknown>): string {\n return Object.entries(props)\n .filter(([key]) => key !== 'children')\n .sort(([a], [b]) => a.localeCompare(b))\n .map(([key, value]) => ` ${key}=${serialiseProp(value)}`)\n .join('');\n}\n\n/**\n * Serialise a JSX node to a string.\n *\n * @param node - The JSX node.\n * @param indentation - The indentation level. Defaults to `0`. This should not\n * be set by the caller, as it is used for recursion.\n * @returns The serialised JSX node.\n */\nexport function serialiseJsx(node: SnapNode, indentation = 0): string {\n if (Array.isArray(node)) {\n return node.map((child) => serialiseJsx(child, indentation)).join('');\n }\n\n const indent = ' '.repeat(indentation);\n if (typeof node === 'string') {\n return `${indent}${node}\\n`;\n }\n\n if (!node) {\n return '';\n }\n\n const { type, props } = node as GenericSnapElement;\n const trailingNewline = indentation > 0 ? '\\n' : '';\n\n if (hasProperty(props, 'children')) {\n const children = serialiseJsx(props.children as SnapNode, indentation + 1);\n return `${indent}<${type}${serialiseProps(\n props,\n )}>\\n${children}${indent}</${type}>${trailingNewline}`;\n }\n\n return `${indent}<${type}${serialiseProps(props)} />${trailingNewline}`;\n}\n"]}