@supernaut/next-image-storyblok-loader
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Storyblok image loader for the Next.js Image component
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const IMAGE_SIZE_LIMIT = 4000 as const;\nexport const DEFAULT_HOST = \"a.storyblok.com\" as const;\n","import { DEFAULT_HOST } from \"./constants\";\n\n/**\n * Gets the host for Storyblok images. Defaults to \"a.storyblok.com\"\n * if no override is provided or STORYBLOK_IMAGE_LOADER_HOST environment\n * variable isn't set.\n * @param {string} override Manual override for the host\n * @returns\n */\nexport function getStoryblokSrcHost(override?: string): string {\n // Regex to match a hostname with an optional port\n const pattern = /^\\w+(\\.\\w+)*(:\\d+)?$/;\n\n // Return override if set and valid\n if (override && pattern.test(override)) {\n return override;\n }\n\n // Return environment variable if set and valid\n if (\n process.env.STORYBLOK_IMAGE_LOADER_HOST &&\n pattern.test(process.env.STORYBLOK_IMAGE_LOADER_HOST)\n ) {\n return process.env.STORYBLOK_IMAGE_LOADER_HOST;\n }\n\n // If no valid override or environment variable is provided, return default\n return DEFAULT_HOST;\n}\n","import type { ParsedStoryblokSrc } from \"../types/parsed-storyblok-src\";\nimport type { StoryblokImageFormat } from \"../types/storyblok-image-format\";\nimport type { StoryblokImageLoaderOptions } from \"../types/storyblok-image-loader-options\";\nimport type { StoryblokImageResize } from \"../types/storyblok-image-resize\";\n\nimport { StoryblokImageFocus } from \"../types/storyblok-image-focus\";\nimport { getStoryblokSrcHost } from \"./get-storyblok-src-host\";\n\n// Precompiled regex patterns (compiled once per module load)\nconst SIZE_PATTERN = /^(\\d+)x(\\d+)$/;\nconst FOCAL_PATTERN = /focal\\((\\d+)x(\\d+):(\\d+)x(\\d+)\\)/;\n\n// Allow only explicitly supported formats to avoid unsafe casting\nconst ALLOWED_FORMATS: readonly StoryblokImageFormat[] = [\n \"avif\",\n \"jpeg\",\n \"png\",\n \"webp\",\n];\n\ntype ParsedFilters = {\n focus?: StoryblokImageFocus;\n format?: StoryblokImageFormat;\n quality?: number;\n};\n\nexport function parseStoryblokSrc(\n src: string,\n options?: StoryblokImageLoaderOptions,\n): ParsedStoryblokSrc {\n let url: URL;\n try {\n url = new URL(src);\n } catch (error) {\n console.error(error);\n throw new TypeError(`Invalid Storyblok image URL: ${src}`);\n }\n\n // Normalize host (retain original protocol)\n url.host = getStoryblokSrcHost(options?.host);\n\n const pathSegments = url.pathname.split(\"/\").filter(Boolean); // drop empty leading segment\n const mIndex = pathSegments.indexOf(\"m\");\n\n // Base filename should point to the original asset root, i.e., everything before /m/... (if present)\n // Examples:\n // /f/123456/image.jpg -> /f/123456/image.jpg (no transformation)\n // /f/123456/m/800x600/filters:.../image.jpg -> /f/123456\n const baseSegments =\n mIndex >= 0 ? pathSegments.slice(0, mIndex) : pathSegments;\n // If we have a direct asset (no m) keep full path; if transformed, only keep first 2 segments after /f\n // Previous implementation sliced first 6 raw splits; replicating intent by reconstructing then trimming '/m'\n // Build a preliminary filename URL\n const basePath = `/${baseSegments.join(\"/\")}`;\n const filename = new URL(basePath, url).href;\n\n const result: ParsedStoryblokSrc = { filename };\n\n // Size parsing (only when 'm' segment is present and followed by \\d+x\\d+)\n if (mIndex >= 0) {\n const sizeCandidate = pathSegments[mIndex + 1];\n const sizeMatch = SIZE_PATTERN.exec(sizeCandidate || \"\");\n if (sizeMatch) {\n const width = Number.parseInt(sizeMatch[1], 10);\n const height = Number.parseInt(sizeMatch[2], 10);\n if (!Number.isNaN(width) && !Number.isNaN(height)) {\n const resize: StoryblokImageResize = { height, width };\n result.resize = resize;\n }\n }\n }\n\n // Filters parsing (look for the first segment that starts with filters:)\n const filtersSegment = pathSegments.find((segment) =>\n segment.startsWith(\"filters:\"),\n );\n const { focus, format, quality } = parseFilters(filtersSegment);\n if (typeof quality !== \"undefined\") {\n result.quality = quality;\n }\n if (typeof format !== \"undefined\") {\n result.format = format;\n }\n if (typeof focus !== \"undefined\") {\n result.focus = focus;\n }\n\n return result;\n}\n\nfunction parseFilters(segment?: string): ParsedFilters {\n if (!segment || !segment.startsWith(\"filters:\")) return {};\n // Remove the leading \"filters:\" then split into individual filters preserving order\n const rawFilters = segment\n .substring(\"filters:\".length)\n // Convert :x to __x so we can split safely while keeping order\n .replace(/:([a-z])/g, \"__$1\")\n .split(\"__\");\n\n const parsed: ParsedFilters = {};\n for (const filter of rawFilters) {\n if (filter.startsWith(\"quality\")) {\n const value = Number.parseInt(\n filter.replace(/quality\\((.+)\\)/, \"$1\"),\n 10,\n );\n if (!Number.isNaN(value) && value >= 1 && value <= 100) {\n parsed.quality = value;\n }\n } else if (filter.startsWith(\"format\")) {\n const value = filter.replace(\n /format\\((.+)\\)/,\n \"$1\",\n ) as StoryblokImageFormat;\n if (ALLOWED_FORMATS.includes(value)) {\n parsed.format = value;\n }\n } else if (filter.startsWith(\"focal\") && FOCAL_PATTERN.test(filter)) {\n parsed.focus = filter.replace(\n FOCAL_PATTERN,\n \"$1x$2:$3x$4\",\n ) as StoryblokImageFocus;\n }\n }\n return parsed;\n}\n","import type { AssetStoryblok } from \"../types/asset-storyblok\";\nimport type { StoryblokImageLoaderOptions } from \"../types/storyblok-image-loader-options\";\n\nimport { parseStoryblokSrc } from \"./parse-storyblok-src\";\n\nexport function getStoryblokImageFilename(\n image: AssetStoryblok | string | undefined,\n imageOptions?: null | StoryblokImageLoaderOptions,\n) {\n let filename = \"\";\n const options: StoryblokImageLoaderOptions = imageOptions || {};\n if (image && typeof image !== \"string\" && !!image?.focus) {\n options.focus = image?.focus;\n }\n if (typeof image === \"string\") {\n const parsed = parseStoryblokSrc(image, options);\n filename = parsed.filename;\n if (typeof parsed.focus !== \"undefined\") {\n options.focus = parsed.focus;\n }\n if (typeof parsed.format !== \"undefined\") {\n options.format = parsed.format;\n }\n if (typeof parsed.quality !== \"undefined\") {\n options.quality = parsed.quality;\n }\n if (typeof parsed.resize !== \"undefined\") {\n options.resize = parsed.resize;\n }\n }\n if (typeof image !== \"string\" && image?.filename) {\n filename = image?.filename;\n }\n\n return {\n filename,\n options,\n };\n}\n","export function getStoryblokImageQuality(input: number): string {\n const quality = Math.floor(Math.max(0, Math.min(100, input)));\n return `quality(${quality})`;\n}\n","import type { StoryblokImageLoaderOptions } from \"../types/storyblok-image-loader-options\";\n\nimport { getStoryblokImageQuality } from \"./get-storyblok-image-quality\";\n\nexport function getStoryblokImageFilters(\n options?: StoryblokImageLoaderOptions,\n): string | undefined {\n const filters: string[] = [];\n\n if (options?.format) {\n filters.push(`format(${options.format})`);\n }\n if (typeof options?.quality === \"number\") {\n filters.push(getStoryblokImageQuality(options.quality));\n }\n if (options?.resize && options?.focus) {\n filters.push(`focal(${options.focus})`);\n }\n const filtersString = filters.filter(Boolean).join(\":\");\n return filtersString ? `filters:${filtersString}` : undefined;\n}\n","export const STORYBLOK_IMAGE_SIZE_LIMIT = 4000 as const;\n","import type { StoryblokImageResize } from \"../types/storyblok-image-resize\";\n\nimport { STORYBLOK_IMAGE_SIZE_LIMIT } from \"./storyblok-image-size-limit\";\n\nexport function getStoryblokImageSize(\n resize: StoryblokImageResize,\n): string | undefined {\n if (!resize.width) {\n return;\n }\n\n let { height = 0, width } = resize;\n\n if (width > height && width > STORYBLOK_IMAGE_SIZE_LIMIT) {\n width = STORYBLOK_IMAGE_SIZE_LIMIT;\n height = resize.height\n ? Math.floor((resize.height / resize.width) * width)\n : 0;\n }\n if (resize.height && height > width && height > STORYBLOK_IMAGE_SIZE_LIMIT) {\n height = STORYBLOK_IMAGE_SIZE_LIMIT;\n width = Math.floor((resize.width / resize.height) * height);\n }\n return `${width}x${height}`;\n}\n","import { DEFAULT_HOST } from \"./constants\";\n\nexport function imgSrcIsStoryblok(\n src: string,\n host: string = DEFAULT_HOST,\n): boolean {\n const url = new URL(src);\n return url.host.includes(host);\n}\n","import type { AssetStoryblok } from \"../types/asset-storyblok\";\nimport type { StoryblokImageLoaderOptions } from \"../types/storyblok-image-loader-options\";\n\nimport { getStoryblokImageFilename } from \"./get-storyblok-image-filename\";\nimport { getStoryblokImageFilters } from \"./get-storyblok-image-filters\";\nimport { getStoryblokImageSize } from \"./get-storyblok-image-size\";\nimport { imgSrcIsStoryblok } from \"./img-src-is-storyblok\";\n\n/**\n * Get Storyblok image src URL from given asset and options\n * @param image Storyblok asset or image URL\n * @param imageOptions Options for constructing the image URL\n * @returns URL string or undefined if no URL could be constructed\n */\nexport function getStoryblokSrc(\n image: AssetStoryblok | string | undefined,\n imageOptions?: null | StoryblokImageLoaderOptions,\n): string | undefined {\n // Exit if image is a string and not a Storyblok asset URL\n if (\n typeof image === \"string\" &&\n !imgSrcIsStoryblok(image, imageOptions?.host)\n ) {\n return image;\n }\n\n // Get filename\n const { filename, options } = getStoryblokImageFilename(image, imageOptions);\n\n // Exit if no filename could be constructed\n if (!filename) {\n return;\n }\n\n // Create an array of path based options\n const parts: (string | undefined)[] = [filename, \"m\"];\n\n // Add resize options if set\n if (options?.resize) {\n parts.push(getStoryblokImageSize(options.resize));\n }\n\n // Add smart format option if not explicitly disabled\n if ((options?.resize || options?.focus) && options?.smart !== false) {\n parts.push(\"smart\");\n }\n\n // Add filters if set\n if (typeof options !== \"undefined\") {\n parts.push(getStoryblokImageFilters(options));\n }\n\n // Join parts into a path string\n const src = parts.filter(Boolean).join(\"/\");\n\n // If a prefix is set, remove host and prepend prefix\n if (imageOptions?.prefix || process.env.STORYBLOK_IMAGE_LOADER_PREFIX) {\n const prefix =\n imageOptions?.prefix || process.env.STORYBLOK_IMAGE_LOADER_PREFIX;\n const url = new URL(src);\n return `${prefix}${url.pathname}`.replace(\"//\", \"/\");\n }\n\n // Return the constructed URL\n return src;\n}\n","import type { ImageLoader } from \"next/image\";\n\nimport type { StoryblokImageLoaderOptions } from \"../types/storyblok-image-loader-options\";\n\nimport { getStoryblokSrc } from \"./get-storyblok-src\";\nimport { imgSrcIsStoryblok } from \"./img-src-is-storyblok\";\nimport { parseStoryblokSrc } from \"./parse-storyblok-src\";\n\n/**\n * Get a Storyblok image loader for Next.js Image component.\n * @param options Options for the loader\n * @returns Image loader function\n */\nexport function getStoryblokImageLoader(\n options: StoryblokImageLoaderOptions = {},\n): ImageLoader {\n return ({ quality, src, width: inputWidth }) => {\n // Check if it's a Storyblok URL first\n if (!imgSrcIsStoryblok(src, options.host)) {\n return src;\n }\n\n const url = new URL(src);\n\n const parsed = parseStoryblokSrc(src);\n\n const parts = url.pathname.split(\"/\");\n const size = parts[3]?.split(\"x\");\n\n if (!size || size.length < 2) {\n // If URL doesn't have the expected format, use getStoryblokSrc directly\n const loaderOptions: StoryblokImageLoaderOptions = {\n ...options,\n resize: { width: inputWidth },\n };\n if (typeof quality === \"number\") {\n loaderOptions.quality = quality;\n }\n return getStoryblokSrc(src, loaderOptions) || src;\n }\n\n const originalWidth = Number.parseInt(size[0], 10);\n const originalHeight = Number.parseInt(size[1], 10);\n\n const originalAspectRatio = originalWidth / originalHeight;\n let resizedAspectRatio = originalAspectRatio;\n\n if (parsed.resize?.height) {\n resizedAspectRatio = parsed.resize.width / parsed.resize.height;\n }\n\n const resize = {\n height: resizedAspectRatio\n ? Math.floor(inputWidth / resizedAspectRatio)\n : 0,\n width: inputWidth,\n };\n\n if (typeof quality !== \"undefined\") {\n options.quality = quality;\n }\n if (inputWidth !== undefined && typeof resize !== \"undefined\") {\n options.resize = resize;\n }\n\n return getStoryblokSrc(src, options) || src;\n };\n}\n","import type { ImageLoader } from \"next/image\";\n\nimport { getStoryblokImageLoader } from \"./get-storyblok-image-loader\";\n\n/**\n * Storyblok image loader for Next.js Image component with default options.\n */\nexport const storyblokImageLoader: ImageLoader = getStoryblokImageLoader();\n"]}