compare-pdf-plus
Version:
Standalone node module that compares PDFs
1 lines • 42.5 kB
Source Map (JSON)
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gm from \"gm\";\nimport path from \"node:path\";\nimport type { Coordinates } from \"../comparePdf\";\n\ninterface PdfDetails {\n buffer: Buffer;\n filename: string;\n}\n\ninterface Config {\n settings: {\n density: number;\n quality: number;\n };\n}\n\ninterface CropCoordinates {\n width: number;\n height: number;\n x: number;\n y: number;\n}\n\n// const imageMagick = gm.subClass({ imageMagick: true });\nconst imageMagick = gm.subClass({ imageMagick: \"7+\" });\n\nexport const pdfToPng = (\n pdfDetails: PdfDetails,\n pngFilePath: string,\n config: Config,\n): Promise<void> => {\n return new Promise((resolve, reject) => {\n const pdfBuffer = pdfDetails.buffer;\n const pdfFilename = path.parse(pdfDetails.filename).name;\n\n imageMagick(pdfBuffer, pdfFilename)\n .command(\"convert\")\n .density(config.settings.density, config.settings.density)\n .quality(config.settings.quality)\n .write(pngFilePath, (err) => {\n err ? reject(err) : resolve();\n });\n });\n};\n\nexport const applyMask = (\n pngFilePath: string,\n coordinates: Coordinates = { x0: 0, y0: 0, x1: 0, y1: 0 },\n color = \"black\",\n): Promise<void> => {\n return new Promise((resolve, reject) => {\n imageMagick(pngFilePath)\n .command(\"convert\")\n .drawRectangle(\n coordinates.x0,\n coordinates.y0,\n coordinates.x1,\n coordinates.y1,\n )\n .fill(color)\n .write(pngFilePath, (err) => {\n err ? reject(err) : resolve();\n });\n });\n};\n\nexport const applyCrop = (\n pngFilePath: string,\n coordinates: CropCoordinates = { width: 0, height: 0, x: 0, y: 0 },\n index = 0,\n): Promise<void> => {\n return new Promise((resolve, reject) => {\n imageMagick(pngFilePath)\n .command(\"convert\")\n .crop(coordinates.width, coordinates.height, coordinates.x, coordinates.y)\n .write(pngFilePath.replace(\".png\", `-${index}.png`), (err) => {\n err ? reject(err) : resolve();\n });\n });\n};\n","// For Node.js only pdf-js legacy is supported\nimport {\n getDocument,\n type PDFDocumentProxy,\n} from 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=> void;\n}\n\nexport const pdfPageToPng = async (\n pdfDocument: PDFDocumentProxy,\n pageNumber: number,\n filename: string,\n isSinglePage = false,\n): Promise<void> => {\n const page = await pdfDocument.getPage(pageNumber);\n const viewport = page.getViewport({ scale: 1.38889 });\n const canvasFactory = pdfDocument.canvasFactory as CanvasFactory;\n const canvasAndContext = canvasFactory.create(\n viewport.width,\n viewport.height,\n );\n const renderContext = {\n canvasContext: canvasAndContext.context,\n viewport: viewport,\n };\n\n await page.render(renderContext).promise;\n\n const image = canvasAndContext.canvas.toBuffer(\"image/png\");\n const pngFileName = isSinglePage\n ? filename\n : filename.replace(\".png\", `-${pageNumber - 1}.png`);\n fs.writeFileSync(pngFileName, image);\n};\n\nexport const pdfToPng = async (\n pdfDetails: PdfDetails,\n pngFilePath: string,\n config: Config,\n): Promise<void> => {\n const pdfData = new Uint8Array(pdfDetails.buffer);\n const pdfDocument = await getDocument({\n disableFontFace: config.settings?.disableFontFace ?? true,\n data: pdfData,\n cMapUrl: CMAP_URL,\n cMapPacked: CMAP_PACKED,\n standardFontDataUrl: STANDARD_FONT_DATA_URL,\n verbosity: config.settings?.verbosity ?? 0,\n }).promise;\n\n for (let index = 1; index <= pdfDocument.numPages; index++) {\n await pdfPageToPng(\n pdfDocument,\n index,\n pngFilePath,\n pdfDocument.numPages === 1,\n );\n }\n};\n\nexport const applyMask = async (\n pngFilePath: string,\n coordinates: Coordinates = { x0: 0, y0: 0, x1: 0, y1: 0 },\n color = \"black\",\n): Promise<void> => {\n return new Promise((resolve, reject) => {\n const data = fs.readFileSync(pngFilePath);\n const img = new Image();\n img.src = data;\n const canvas = createCanvas(img.width, img.height);\n const ctx = canvas.getContext(\"2d\");\n ctx.drawImage(img, 0, 0, img.width, img.height);\n ctx.beginPath();\n ctx.fillRect(\n coordinates.x0,\n coordinates.y0,\n coordinates.x1 - coordinates.x0,\n coordinates.y1 - 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path.parse(baselinePdfFilename).name;\n const actualPdfBase64 = Buffer.from(actualPdfBuffer).toString(\"base64\");\n const baselinePdfBase64 = Buffer.from(baselinePdfBuffer).toString(\"base64\");\n\n if (actualPdfBase64 !== baselinePdfBase64) {\n resolve({\n status: \"failed\",\n message: `${actualPdfBaseName}.pdf is not the same as ${baselinePdfBaseName}.pdf compared by their base64 values.`,\n });\n } else {\n resolve({ status: \"passed\" });\n }\n });\n};\n","import filter from \"lodash/filter\";\nimport fs from \"fs-extra\";\nimport path from \"node:path\";\nimport { PNG } from \"pngjs\";\nimport pixelmatch from \"pixelmatch\";\nimport { ensureAndCleanupPath } from \"./utils\";\nimport type { ComparePdfConfig } from \"./config\";\nimport type { ComparePdfOptions } from \"./comparePdf\";\n\nexport interface PdfDetails {\n filename: string;\n buffer: Buffer;\n}\n\nexport interface CompareDetails {\n actualPdfFilename: string;\n baselinePdfFilename: string;\n actualPdfBuffer: Buffer;\n baselinePdfBuffer: Buffer;\n config: ComparePdfConfig;\n opts: ComparePdfOptions;\n}\n\nexport interface ComparisonResult {\n status: \"passed\" | \"failed\";\n numDiffPixels?: number;\n diffPng?: string;\n actual?: string;\n error?: Error;\n message?: string;\n details?: ComparisonResult[];\n}\n\nexport const comparePngs = async (\n actual: string,\n baseline: string,\n diff: string,\n config: CompareDetails[\"config\"],\n): Promise<ComparisonResult> => {\n return new Promise((resolve) => {\n try {\n const actualPng = PNG.sync.read(fs.readFileSync(actual));\n const baselinePng = PNG.sync.read(fs.readFileSync(baseline));\n const { width, height } = actualPng;\n const diffPng = new PNG({ width, height });\n\n const threshold = config.settings?.threshold ?? 0.05;\n const tolerance = config.settings?.tolerance ?? 0;\n\n const numDiffPixels = pixelmatch(\n actualPng.data,\n baselinePng.data,\n diffPng.data,\n width,\n height,\n {\n threshold,\n },\n );\n\n if (numDiffPixels > tolerance) {\n fs.writeFileSync(diff, PNG.sync.write(diffPng));\n resolve({ status: \"failed\", numDiffPixels, diffPng: diff });\n } else {\n resolve({ status: \"passed\" });\n }\n } catch (error) {\n resolve({ status: \"failed\", actual, error: error as Error });\n }\n });\n};\n\nexport const comparePdfByImage = async ({\n actualPdfFilename,\n baselinePdfFilename,\n actualPdfBuffer,\n baselinePdfBuffer,\n config,\n opts,\n}: CompareDetails): Promise<ComparisonResult> => {\n // biome-ignore lint/suspicious/noAsyncPromiseExecutor: <explanation>\n return new Promise(async (resolve) => {\n try {\n const imageEngine = await import(\n config.settings.imageEngine === \"graphicsMagick\"\n ? \"./engines/graphicsMagick\"\n : \"./engines/native\"\n );\n\n const actualPdfBaseName = path.parse(actualPdfFilename).name;\n const baselinePdfBaseName = path.parse(baselinePdfFilename).name;\n\n if (\n config.paths.actualPngRootFolder &&\n config.paths.baselinePngRootFolder &&\n config.paths.diffPngRootFolder\n ) {\n const actualPngDirPath = `${config.paths.actualPngRootFolder}/${actualPdfBaseName}`;\n const baselinePngDirPath = `${config.paths.baselinePngRootFolder}/${baselinePdfBaseName}`;\n const diffPngDirPath = `${config.paths.diffPngRootFolder}/${actualPdfBaseName}`;\n\n ensureAndCleanupPath(actualPngDirPath);\n ensureAndCleanupPath(baselinePngDirPath);\n ensureAndCleanupPath(diffPngDirPath);\n\n const actualPngFilePath = `${actualPngDirPath}/${actualPdfBaseName}.png`;\n const baselinePngFilePath = `${baselinePngDirPath}/${baselinePdfBaseName}.png`;\n\n const actualPdfDetails: PdfDetails = {\n filename: actualPdfFilename,\n buffer: actualPdfBuffer,\n };\n await imageEngine.pdfToPng(actualPdfDetails, actualPngFilePath, config);\n\n const baselinePdfDetails: PdfDetails = {\n filename: baselinePdfFilename,\n buffer: baselinePdfBuffer,\n };\n await imageEngine.pdfToPng(\n baselinePdfDetails,\n baselinePngFilePath,\n config,\n );\n\n const actualPngs = fs\n .readdirSync(actualPngDirPath)\n .filter((pngFile) =>\n path.parse(pngFile).name.startsWith(actualPdfBaseName),\n );\n const baselinePngs = fs\n .readdirSync(baselinePngDirPath)\n .filter((pngFile) =>\n path.parse(pngFile).name.startsWith(baselinePdfBaseName),\n );\n\n if (config.settings.matchPageCount === true) {\n if (actualPngs.length !== baselinePngs.length) {\n resolve({\n status: \"failed\",\n message: `Actual pdf page count (${actualPngs.length}) is not the same as Baseline pdf (${baselinePngs.length}).`,\n });\n return;\n }\n }\n\n const comparisonResults: ComparisonResult[] = [];\n for (let index = 0; index < baselinePngs.length; index++) {\n let suffix = \"\";\n if (baselinePngs.length > 1) {\n suffix = `-${index}`;\n }\n\n const actualPng =\n actualPngs.length > 1\n ? `${actualPngDirPath}/${actualPdfBaseName}${suffix}.png`\n : `${actualPngDirPath}/${actualPdfBaseName}.png`;\n const baselinePng = `${baselinePngDirPath}/${baselinePdfBaseName}${suffix}.png`;\n const diffPng = `${diffPngDirPath}/${actualPdfBaseName}_diff${suffix}.png`;\n\n if (\n opts.skipPageIndexes?.length &&\n opts.skipPageIndexes.includes(index)\n ) {\n continue;\n }\n\n if (\n opts.onlyPageIndexes?.length &&\n !opts.onlyPageIndexes.includes(index)\n ) {\n continue;\n }\n\n if (opts.masks) {\n const pageMasks = filter(opts.masks, { pageIndex: index });\n if (pageMasks?.length) {\n for (const pageMask of pageMasks) {\n await imageEngine.applyMask(\n actualPng,\n pageMask.coordinates,\n pageMask.color,\n );\n await imageEngine.applyMask(\n baselinePng,\n pageMask.coordinates,\n pageMask.color,\n );\n }\n }\n }\n\n if (opts.crops?.length) {\n const pageCroppings = filter(opts.crops, { pageIndex: index });\n if (pageCroppings?.length) {\n for (\n let cropIndex = 0;\n cropIndex < pageCroppings.length;\n cropIndex++\n ) {\n await imageEngine.applyCrop(\n actualPng,\n pageCroppings[cropIndex]?.coordinates,\n cropIndex,\n );\n await imageEngine.applyCrop(\n baselinePng,\n pageCroppings[cropIndex]?.coordinates,\n cropIndex,\n );\n comparisonResults.push(\n await comparePngs(\n actualPng.replace(\".png\", `-${cropIndex}.png`),\n baselinePng.replace(\".png\", `-${cropIndex}.png`),\n diffPng,\n config,\n ),\n );\n }\n }\n } else {\n comparisonResults.push(\n await comparePngs(actualPng, baselinePng, diffPng, config),\n );\n }\n }\n\n if (config.settings.cleanPngPaths) {\n ensureAndCleanupPath(config.paths.actualPngRootFolder);\n ensureAndCleanupPath(config.paths.baselinePngRootFolder);\n }\n\n const failedResults = filter(\n comparisonResults,\n (res) => res.status === \"failed\",\n );\n if (failedResults.length > 0) {\n resolve({\n status: \"failed\",\n message: `${actualPdfBaseName}.pdf is not the same as ${baselinePdfBaseName}.pdf compared by their images.`,\n details: failedResults,\n });\n } else {\n resolve({ status: \"passed\" });\n }\n } else {\n resolve({\n status: \"failed\",\n message:\n \"PNG directory is not set. Please define correctly then try again.\",\n });\n }\n } catch (error) {\n resolve({\n status: \"failed\",\n message: `An error occurred.\\n${error}`,\n });\n }\n });\n};\n","import path from \"node:path\";\n\nexport interface ConfigPaths {\n actualPdfRootFolder: string;\n baselinePdfRootFolder: string;\n actualPngRootFolder: string;\n baselinePngRootFolder: string;\n diffPngRootFolder: string;\n}\n\nexport interface ConfigSettings {\n imageEngine: \"graphicsMagick\" | \"native\";\n density: number;\n quality: number;\n tolerance: number;\n threshold: number;\n cleanPngPaths?: boolean;\n matchPageCount?: boolean;\n disableFontFace?: boolean;\n verbosity?: number;\n}\n\nexport interface ComparePdfConfig {\n paths: ConfigPaths;\n settings: ConfigSettings;\n}\n\nconst config = {\n paths: {\n actualPdfRootFolder: path.resolve(process.cwd(), \"data/actualPdfs\"),\n baselinePdfRootFolder: path.join(process.cwd(), \"data/baselinePdfs\"),\n actualPngRootFolder: path.join(process.cwd(), \"data/actualPngs\"),\n baselinePngRootFolder: path.join(process.cwd(), \"data/baselinePngs\"),\n diffPngRootFolder: path.join(process.cwd(), \"data/diffPngs\"),\n },\n settings: {\n imageEngine: \"graphicsMagick\" as const,\n density: 100,\n quality: 70,\n tolerance: 0,\n threshold: 0.05,\n cleanPngPaths: false,\n matchPageCount: true,\n disableFontFace: true,\n verbosity: 0,\n },\n} as const satisfies ComparePdfConfig;\n\nexport default config;\n","import fs from \"fs-extra\";\nimport path from \"node:path\";\nimport { copyJsonObject, ensurePathsExist } from \"./utils\";\nimport { comparePdfByBase64 } from \"./compareData\";\nimport { comparePdfByImage, type CompareDetails } from \"./compareImages\";\nimport defaultConfig, { type ComparePdfConfig } from \"./config\";\n\nexport interface Coordinates {\n x0: number;\n y0: number;\n x1: number;\n y1: number;\n}\n\nexport interface PageMask {\n pageIndex: number;\n coordinates: Coordinates;\n color?: string;\n}\n\nexport interface Dimension {\n width: number;\n height: number;\n x: number;\n y: number;\n}\n\nexport interface PageCrop {\n pageIndex: number;\n coordinates: Dimension;\n}\n\nexport interface ComparePdfOptions {\n masks: PageMask[];\n crops: PageCrop[];\n onlyPageIndexes: number[];\n skipPageIndexes: number[];\n}\n\nexport interface Details {\n status: string;\n numDiffPixels: string;\n diffPng: string;\n}\n\nexport interface Results {\n status: string;\n message: string;\n details?: Details[];\n}\n\nexport interface CompareResult {\n status: \"not executed\" | \"failed\" | \"passed\";\n message?: string;\n details?: Array<{\n status: string;\n numDiffPixels?: number;\n diffPng?: string;\n actual?: string;\n error?: Error;\n }>;\n}\n\nexport type ComparisonType = \"byBase64\" | \"byImage\";\n\nexport class ComparePdf {\n private config: ComparePdfConfig;\n private opts: ComparePdfOptions;\n private result: CompareResult;\n private baselinePdfBufferData?: Buffer;\n private actualPdfBufferData?: Buffer;\n private baselinePdf?: string;\n private actualPdf?: string;\n\n constructor(config: ComparePdfConfig = copyJsonObject(defaultConfig)) {\n this.config = config;\n ensurePathsExist(this.config);\n\n this.opts = {\n masks: [],\n crops: [],\n onlyPageIndexes: [],\n skipPageIndexes: [],\n };\n\n this.result = {\n status: \"not executed\",\n };\n }\n\n baselinePdfBuffer(\n baselinePdfBuffer: Buffer,\n baselinePdfFilename?: string,\n ): this {\n if (baselinePdfBuffer) {\n this.baselinePdfBufferData = baselinePdfBuffer;\n if (baselinePdfFilename) {\n this.baselinePdf = baselinePdfFilename;\n }\n } else {\n this.result = {\n status: \"failed\",\n message:\n \"Baseline pdf buffer is invalid or filename is missing. Please define correctly then try again.\",\n };\n }\n return this;\n }\n\n baselinePdfFile(baselinePdf: string): this {\n if (baselinePdf) {\n const baselinePdfBaseName = path.parse(baselinePdf).name;\n if (fs.existsSync(baselinePdf)) {\n this.baselinePdf = baselinePdf;\n } else if (\n fs.existsSync(\n `${this.config.paths.baselinePdfRootFolder}/${baselinePdfBaseName}.pdf`,\n )\n ) {\n this.baselinePdf = `${this.config.paths.baselinePdfRootFolder}/${baselinePdfBaseName}.pdf`;\n } else {\n this.result = {\n status: \"failed\",\n message:\n \"Baseline pdf file path does not exists. Please define correctly then try again.\",\n };\n }\n } else {\n this.result = {\n status: \"failed\",\n message:\n \"Baseline pdf file path was not set. Please define correctly then try again.\",\n };\n }\n return this;\n }\n\n actualPdfBuffer(actualPdfBuffer: Buffer, actualPdfFilename?: string): this {\n if (actualPdfBuffer) {\n this.actualPdfBufferData = actualPdfBuffer;\n if (actualPdfFilename) {\n this.actualPdf = actualPdfFilename;\n }\n } else {\n this.result = {\n status: \"failed\",\n message:\n \"Actual pdf buffer is invalid or filename is missing. Please define correctly then try again.\",\n };\n }\n return this;\n }\n\n actualPdfFile(actualPdf: string): this {\n if (actualPdf) {\n const actualPdfBaseName = path.parse(actualPdf).name;\n if (fs.existsSync(actualPdf)) {\n this.actualPdf = actualPdf;\n } else if (\n fs.existsSync(\n `${this.config.paths.actualPdfRootFolder}/${actualPdfBaseName}.pdf`,\n )\n ) {\n this.actualPdf = `${this.config.paths.actualPdfRootFolder}/${actualPdfBaseName}.pdf`;\n } else {\n this.result = {\n status: \"failed\",\n message:\n \"Actual pdf file path does not exists. Please define correctly then try again.\",\n };\n }\n } else {\n this.result = {\n status: \"failed\",\n message:\n \"Actual pdf file path was not set. Please define correctly then try again.\",\n };\n }\n return this;\n }\n\n addMask(\n pageIndex: number,\n coordinates = { x0: 0, y0: 0, x1: 0, y1: 0 },\n color = \"black\",\n ): this {\n this.opts.masks.push({\n pageIndex,\n coordinates,\n color,\n });\n return this;\n }\n\n addMasks(masks: ComparePdfOptions[\"masks\"]): this {\n this.opts.masks = [...this.opts.masks, ...masks];\n return this;\n }\n\n onlyPageIndexes(pageIndexes: number[]): this {\n this.opts.onlyPageIndexes = [...this.opts.onlyPageIndexes, ...pageIndexes];\n return this;\n }\n\n skipPageIndexes(pageIndexes: number[]): this {\n this.opts.skipPageIndexes = [...this.opts.skipPageIndexes, ...pageIndexes];\n return this;\n }\n\n cropPage(\n pageIndex: number,\n coordinates = { width: 0, height: 0, x: 0, y: 0 },\n ): this {\n this.opts.crops.push({\n pageIndex,\n coordinates,\n });\n return this;\n }\n\n cropPages(cropPagesList: ComparePdfOptions[\"crops\"]): this {\n this.opts.crops = [...this.opts.crops, ...cropPagesList];\n return this;\n }\n\n async compare(\n comparisonType: ComparisonType = \"byImage\",\n ): Promise<CompareResult> {\n if (\n this.result.status === \"not executed\" ||\n this.result.status !== \"failed\"\n ) {\n if (!this.actualPdf || !this.baselinePdf) {\n throw new Error(\"PDF files not properly initialized\");\n }\n\n const compareDetails = {\n actualPdfFilename: this.actualPdf,\n baselinePdfFilename: this.baselinePdf,\n actualPdfBuffer:\n this.actualPdfBufferData ?? fs.readFileSync(this.actualPdf),\n baselinePdfBuffer:\n this.baselinePdfBufferData ?? fs.readFileSync(this.baselinePdf),\n config: this.config,\n opts: this.opts,\n } satisfies CompareDetails;\n\n switch (comparisonType) {\n case \"byBase64\":\n this.result = await comparePdfByBase64(compareDetails);\n break;\n default:\n this.result = await comparePdfByImage(compareDetails);\n break;\n }\n }\n return this.result;\n }\n}\n\nexport default ComparePdf;\n"]}