{"version":3,"sources":["../src/metadata-image.ts"],"sourcesContent":["import type { ImageResponseOptions } from \"@vercel/og\";\nimport type { ReactElement } from \"react\";\nimport { omitFarmResponseBody } from \"./response-body\";\nimport { matchesFarmIfNoneMatch } from \"./server-http\";\n\nconst REACT_ELEMENT_TYPE = Symbol.for(\"react.element\");\nconst REACT_TRANSITIONAL_ELEMENT_TYPE = Symbol.for(\"react.transitional.element\");\nconst REACT_FORWARD_REF_TYPE = Symbol.for(\"react.forward_ref\");\nconst REACT_MEMO_TYPE = Symbol.for(\"react.memo\");\nconst REACT_LAZY_TYPE = Symbol.for(\"react.lazy\");\n\ntype MetadataImageSize = {\n width?: number;\n height?: number;\n};\n\ntype MetadataImageFont = Omit[number], \"data\"> & {\n data: ArrayBuffer | ArrayBufferView | Promise;\n};\n\nexport type FarmMetadataImageModule = {\n size?: MetadataImageSize;\n contentType?: string;\n revalidate?: number | false;\n fonts?: MetadataImageFont[];\n emoji?: ImageResponseOptions[\"emoji\"];\n debug?: boolean;\n};\n\nexport type FarmMetadataImageResponseOptions = {\n method?: string;\n ifNoneMatch?: string | null;\n};\n\nfunction isResponse(value: unknown): value is Response {\n return (\n typeof Response !== \"undefined\" &&\n (value instanceof Response ||\n Boolean(\n value &&\n typeof value === \"object\" &&\n typeof (value as Response).arrayBuffer === \"function\" &&\n (value as Response).headers,\n ))\n );\n}\n\nfunction isThenable(value: unknown): value is PromiseLike {\n return Boolean(\n value &&\n (typeof value === \"object\" || typeof value === \"function\") &&\n typeof (value as PromiseLike).then === \"function\",\n );\n}\n\nfunction isReactElement(value: unknown): value is ReactElement> {\n if (!value || typeof value !== \"object\") return false;\n const marker = (value as { $$typeof?: symbol }).$$typeof;\n return marker === REACT_ELEMENT_TYPE || marker === REACT_TRANSITIONAL_ELEMENT_TYPE;\n}\n\nasync function prepareMetadataImageNode(node: unknown): Promise {\n if (isThenable(node)) {\n return prepareMetadataImageNode(await node);\n }\n\n if (Array.isArray(node)) {\n return Promise.all(node.map((child) => prepareMetadataImageNode(child)));\n }\n\n if (!isReactElement(node)) {\n return node;\n }\n\n const element = node;\n const type = element.type as any;\n const props = element.props || {};\n\n if (typeof type === \"function\") {\n if (type.prototype?.isReactComponent) {\n throw new Error(\n \"Metadata image components must be stateless function components; React class components are not supported.\",\n );\n }\n return prepareMetadataImageNode(await type(props));\n }\n\n if (type && typeof type === \"object\") {\n if (type.$$typeof === REACT_MEMO_TYPE) {\n const { createElement } = await import(\"react\");\n return prepareMetadataImageNode(createElement(type.type, props));\n }\n if (type.$$typeof === REACT_FORWARD_REF_TYPE) {\n return prepareMetadataImageNode(await type.render(props, null));\n }\n if (type.$$typeof === REACT_LAZY_TYPE) {\n const { createElement } = await import(\"react\");\n let resolvedType: unknown;\n try {\n resolvedType = type._init(type._payload);\n } catch (suspension) {\n if (suspension && typeof (suspension as Promise).then === \"function\") {\n await suspension;\n resolvedType = type._init(type._payload);\n } else {\n throw suspension;\n }\n }\n return prepareMetadataImageNode(createElement(resolvedType as any, props));\n }\n }\n\n const preparedChildren = await prepareMetadataImageNode(props.children);\n const preparedProps: Record = { ...props };\n\n if (typeof preparedProps.className === \"string\") {\n preparedProps.tw = [preparedProps.tw, preparedProps.className].filter(Boolean).join(\" \");\n delete preparedProps.className;\n }\n delete preparedProps.children;\n\n const { createElement } = await import(\"react\");\n return createElement(type, {\n ...preparedProps,\n key: element.key,\n children: preparedChildren,\n });\n}\n\nasync function normalizeFonts(\n fonts: MetadataImageFont[] | undefined,\n): Promise {\n if (!fonts?.length) return undefined;\n\n return Promise.all(\n fonts.map(async (font) => {\n const data = await font.data;\n const arrayBuffer = ArrayBuffer.isView(data) ? toArrayBuffer(data) : data;\n return { ...font, data: arrayBuffer } as NonNullable[number];\n }),\n );\n}\n\nfunction resolveCacheControl(revalidate: number | false | undefined): string {\n if (revalidate === false) {\n return \"public, max-age=31536000, immutable\";\n }\n if (typeof revalidate === \"number\" && Number.isFinite(revalidate) && revalidate > 0) {\n return `public, s-maxage=${Math.floor(revalidate)}, stale-while-revalidate=300`;\n }\n return \"public, max-age=0, must-revalidate\";\n}\n\nfunction toArrayBuffer(value: ArrayBuffer | ArrayBufferView): ArrayBuffer {\n if (value instanceof ArrayBuffer) return value;\n const bytes = new Uint8Array(value.byteLength);\n bytes.set(new Uint8Array(value.buffer, value.byteOffset, value.byteLength));\n return bytes.buffer;\n}\n\nasync function createEntityTag(body: ArrayBuffer): Promise {\n const digest = await globalThis.crypto.subtle.digest(\"SHA-256\", body);\n const hash = Array.from(new Uint8Array(digest), (byte) => byte.toString(16).padStart(2, \"0\"))\n .join(\"\")\n .slice(0, 32);\n return `\"${hash}\"`;\n}\n\nasync function finalizeMetadataImageResponse(\n body: ArrayBuffer,\n headers: HeadersInit,\n options: FarmMetadataImageResponseOptions,\n): Promise {\n const responseHeaders = new Headers(headers);\n const etag = await createEntityTag(body);\n responseHeaders.set(\"ETag\", etag);\n responseHeaders.set(\"Content-Length\", String(body.byteLength));\n responseHeaders.set(\"X-Content-Type-Options\", \"nosniff\");\n\n if (matchesFarmIfNoneMatch(options.ifNoneMatch, etag)) {\n return new Response(null, { status: 304, headers: responseHeaders });\n }\n\n return new Response(options.method?.toUpperCase() === \"HEAD\" ? null : body, {\n status: 200,\n headers: responseHeaders,\n });\n}\n\n/** @internal */\nexport async function createFarmMetadataImageResponse(\n value: unknown,\n imageModule: FarmMetadataImageModule,\n options: FarmMetadataImageResponseOptions = {},\n): Promise {\n const method = (options.method || \"GET\").toUpperCase();\n if (method !== \"GET\" && method !== \"HEAD\") {\n return new Response(null, { status: 405, headers: { Allow: \"GET, HEAD\" } });\n }\n\n if (isResponse(value)) {\n return method === \"HEAD\" ? omitFarmResponseBody(value) : value;\n }\n\n const cacheControl = resolveCacheControl(imageModule.revalidate);\n const explicitContentType = imageModule.contentType?.split(\";\", 1)[0]?.trim().toLowerCase();\n\n if (isReactElement(value) && explicitContentType !== \"image/svg+xml\") {\n const { ImageResponse } = await import(\"@vercel/og\");\n const element = (await prepareMetadataImageNode(value)) as ReactElement;\n const response = new ImageResponse(element, {\n width: imageModule.size?.width || 1200,\n height: imageModule.size?.height || 630,\n fonts: await normalizeFonts(imageModule.fonts),\n emoji: imageModule.emoji,\n debug: imageModule.debug,\n headers: { \"cache-control\": cacheControl },\n });\n const headers = new Headers(response.headers);\n headers.set(\"Cache-Control\", cacheControl);\n return finalizeMetadataImageResponse(await response.arrayBuffer(), headers, options);\n }\n\n let body: ArrayBuffer;\n if (typeof value === \"string\") {\n body = toArrayBuffer(new TextEncoder().encode(value));\n } else if (value instanceof ArrayBuffer || ArrayBuffer.isView(value)) {\n body = toArrayBuffer(value);\n } else if (isReactElement(value)) {\n const { renderToStaticMarkup } = await import(\"react-dom/server\");\n body = toArrayBuffer(new TextEncoder().encode(renderToStaticMarkup(value)));\n } else {\n throw new Error(\"Metadata image must return a Response, string, bytes, or React element\");\n }\n\n return finalizeMetadataImageResponse(\n body,\n {\n \"Content-Type\": imageModule.contentType || \"image/svg+xml; charset=utf-8\",\n 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