Swiftpack.co - Package - MihaelIsaev/wkhtmltopdf

Mihael Isaev

MIT License Swift 4.1 Twitter


Swift lib for building pdf file data from leaf templates and/or web pages through wkhtmltopdf cli Built for Vapor 3 and uses Vapor itself (with Swift-NIO under the hood) and Leaf for templates.

Installation ⚙️

First of all install wkhtmltopdf itself.

Ubuntu

Either install it automatically

sudo apt-get update
sudo apt-get install wkhtmltopdf

or manually e.g. using deb file from latest releases

wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.xenial_amd64.deb
sudo dpkg -i wkhtmltox_0.12.5-1.xenial_amd64.deb
sudo apt-get -f install

or manually e.g. using tar.xz from latest releases

wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
tar -xvf wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
cd wkhtmltox/bin/
sudo mv wkhtmltopdf /usr/bin/wkhtmltopdf
sudo mv wkhtmltoimage /usr/bin/wkhtmltoimage
sudo chmod a+x /usr/bin/wkhtmltopdf
sudo chmod a+x /usr/bin/wkhtmltoimage

also you may need to install some additional packages

sudo apt-get install xvfb libfontconfig libxrender1

macOS

brew cask install wkhtmltopdf

Heroku

Add the WKHTMLTOPDF buildpack to your Heroku app either from the Settings tab on the Heroku dashboard or through the Heroku CLI

When initializing the WK object be sure to specify the "pathToBinary" param as /app/bin/wkhtmltopdf:

WK(pathToBinary: "/app/bin/wkhtmltopdf", .topMargin(20), ...)

Vapor Cloud

I'm not sure that wktmltopdf binary is available in Vapor Cloud, unfortunately. If you have any info regarding that please feel free to send pull request with instructions to update this readme.

Swift Package Manager

Edit your Package.swift

//add this repo to dependencies
.package(url: "https://github.com/MihaelIsaev/wkhtmltopdf.git", from: "1.1.1")
//and don't forget about targets
//"WKHTMLTOPDF"

Example 🔥

The very common usage is to generate some report on request on-the-fly and return pdf file in response

import WKHTMLTOPDF

router.get("pdf") { req throws -> EventLoopFuture<Response> in
    let wk = WK(.topMargin(20),
                .leftMargin(20),
                .rightMargin(20),
                .bottomMargin(20),
                .paperSize(.A4))
    //Also you can provide path to your `wkhtmltopdf` binary
    //while initialization because binary place may be different
    //WK(pathToBinary: "/usr/bin/wkhtmltopdf", .topMargin(20), ...)
    
    struct ReportIntro: Codable {
        var reportName = "Monthly usage"
    }
    struct ReportData: Codable {
        var records:[ReportRecord] = []
    }
    let page1 = Page(view: "report-intro", payload: ReportIntro(), params: PageParam.zoom(1.3))
    let page2 = Page(view: "report-body", payload: ReportData(), params: PageParam.zoom(1.3))
    let page3 = Page<Test>(url: "http://google.com", params: PageParam.zoom(1.3))
    return try wk.generate(container: req, pages: page1, page2, page3).map { pdfData in //Data
        let response = req.makeResponse(pdfData, as: .pdf)
        response.http.headers.add(name: HTTPHeaderName.contentDisposition, value: "attachment; filename=\"report.pdf\"")
        return response
    }
}

Looks good, right? 😃

Note about UTF-8 encoding

Please make sure that you correctly set html headers in your files and installed all necessary rendering packages in your OS.

e.g. correct html header may look like this

<html>
    <head>
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
    </head>
    <body>
    </body>
</html>

ToDo 👨🏻‍💻

  • [x] generate headers/footers from Leaf templates too (available since 1.1 🔥)

Cheatsheet 📌

Global Options

It is GeneralParam enum type.

Uses in WK object initialization.

WK(GeneralParam...)

GeneralParam | Description ------------ | ------------- .quiet | -q, --quiet Be less verbose, maintained for backwards compatibility; Same as using --log-level none .paperSize(PaperSize) | -s, --page-size Set paper size to: A4, Letter, etc. (default A4) .grayscale | -g, --grayscale PDF will be generated in grayscale .lowQuality | -l, --lowquality Generates lower quality pdf/ps. Useful to shrink the result document space .orientation(Orientation) | -O, --orientation Set orientation to Landscape or Portrait (default Portrait) .topMargin(Float) | -T, --margin-top Set the page top margin .rightMargin(Float) | -R, --margin-right Set the page right margin (default 10mm) .bottomMargin(Float) | -B, --margin-bottom Set the page bottom margin .leftMargin(Float) | -L, --margin-left Set the page left margin (default 10mm) .pageHeight(Float) | --page-height Page height .pageWidth(Float) | --page-width Page width .footerCenter(String) | --footer-center Centered footer text .footerFontName(String) | --footer-font-name Set footer font name (default Arial) .footerFontSize(Int) | --footer-font-size Set footer font size (default 12) .footerHtml(url: String) | --footer-html Adds a html footer .footerLeft(String) | --footer-left Left aligned footer text .footerLine | --footer-line Display line above the footer .noFooterLine | --no-footer-line Do not display line above the footer (default) .footerRight(String) | --footer-right Right aligned footer text .footerSpacing(Float) | --footer-spacing Spacing between footer and content in mm (default 0) .headerCenter(String) | --header-center Centered header text .headerFontName(String) | --header-font-name Set header font name (default Arial) .headerFontSize(Int) | --header-font-size Set header font size (default 12) .headerHtml(url: String) | --header-html Adds a html header .headerLeft(String) | --header-left Left aligned header text .headerLine | --header-line Display line below the header .noHeaderLine | --no-header-line Do not display line below the header (default) .headerRight(String) | --header-right Right aligned header text .headerSpacing(Float) | --header-spacing Spacing between header and content in mm (default 0) .replace(name: String, value: String) | --replace Replace [name] with value in header and footer (repeatable) .disableDottedLines | --disable-dotted-lines Do not use dotted lines in the toc .tocHeaderText(String) | --toc-header-text The header text of the toc (default Table of Contents) .tocLevelIndentation(String) | --toc-level-indentation For each level of headings in the toc indent by this length (default 1em) .disableTocLinks | --disable-toc-links Do not link from toc to sections .tocTextSizeShrink(Float) | --toc-text-size-shrink For each level of headings in the toc the font is scaled by this factor (default 0.8) .xslStyleSheet(path: String) | --xsl-style-sheet Use the supplied xsl style sheet for printing the table of content

Page Options

It is PageParam enum type.

Uses in Page object initialization.

Page(view: String, payload: Codable, PageParam...) //for generating Leaf page
//or
Page<Codable>(url: String, PageParam...) //for loading from URL

PageParam | Description ------------ | ------------- .allow(path: String) | --allow Allow the file or files from the specified folder to be loaded (repeatable) .background | --background Do print background (default) .noBackground | --no-background Do not print background .bypassProxyFor(String) | --bypass-proxy-for Bypass proxy for host (repeatable) .cacheDir(path: String) | --cache-dir Web cache directory .checkboxChecked(path: String) | --checkbox-checked-svg Use this SVG file when rendering checked checkboxes .checkboxUnchecked(path: String) | --checkbox-svg Use this SVG file when rendering unchecked checkboxes .cookie(name: String, value: String) | --cookie Set an additional cookie (repeatable), value should be url encoded. .customHeader(name: String, value: String) | --custom-header Set an additional HTTP header (repeatable) .customHeaderPropagation | --custom-header-propagation Add HTTP headers specified by .noCustomHeaderPropagation | --no-custom-header-propagation Do not add HTTP headers specified by .defaultHeader | --default-header Add a default header, with the name of the page to the left, and the page number to the right .encoding(String) | --encoding Set the default text encoding, for input .disableExternalLinks | --disable-external-links Do not make links to remote web pages .enableExternalLinks | --enable-external-links Make links to remote web pages (default) .enableForms | --enable-forms Turn HTML form fields into pdf form fields .disableForms | --disable-forms Do not turn HTML form fields into pdf form fields (default) .images | --images Do load or print images (default) .noImages | --no-images Do not load or print images .disableInternalLinks | --disable-internal-links Do not make local links .enableInternalLinks | --enable-internal-links Make local links (default) .disableJavaScript | -n, --disable-javascript Do not allow web pages to run javascript .enableJavaScript | --enable-javascript Do allow web pages to run javascript (default) .javascriptDelay(msec: Int) | --javascript-delay Wait some milliseconds for javascript finish (default 200) .keepRelativeLinks | --keep-relative-links Keep relative external links as relative external links .loadErrorHandling(Handler) | --load-error-handling Specify how to handle pages that fail to load: abort, ignore or skip (default abort) .loadMediaErrorHandling(Handler) | --load-media-error-handling Specify how to handle media files that fail to load: abort, ignore or skip (default ignore) .enableLocalFileAccess | --disable-local-file-access Do not allowed conversion of a local file to read in other local files, unless explicitly allowed with --allow .disableLocalFileAccess | --enable-local-file-access Allowed conversion of a local file to read in other local files. (default) .minimumFontSize(Int) | --minimum-font-size Minimum font size .excludeFromOutline | --exclude-from-outline Do not include the page in the table of contents and outlines .includeInOutline | --include-in-outline Include the page in the table of contents and outlines (default) .pageOffset(Int) | --page-offset Set the starting page number (default 0) .password(String) | --password HTTP Authentication password .disablePlugins | --disable-plugins Disable installed plugins (default) .enablePlugins | --enable-plugins Enable installed plugins (plugins will likely not work) .postField(name: String, value: String) | --post Add an additional post field (repeatable) .postFile(name: String, path: String) | --post-file Post an additional file (repeatable) .printMediaType | --print-media-type Use print media-type instead of screen .noPrintMediaType | --no-print-media-type Do not use print media-type instead of screen (default) .proxy(String) | -p, --proxy Use a proxy .proxyHostnameLookup | --proxy-hostname-lookup Use the proxy for resolving hostnames .radioButtonChecked(path: String) | --radiobutton-checked-svg Use this SVG file when rendering checked radiobuttons .radioButtonUnchecked(path: String) | --radiobutton-svg Use this SVG file when rendering unchecked radiobuttons .resolveRelativeLinks | --resolve-relative-links Resolve relative external links into absolute links (default) .runScript(js: String) | --run-script Run this additional javascript after the page is done loading (repeatable) .disableSmartShrinking | --disable-smart-shrinking Disable the intelligent shrinking strategy used by WebKit that makes the pixel/dpi ratio none constant .enableSmartShrinking | --enable-smart-shrinking Enable the intelligent shrinking strategy used by WebKit that makes the pixel/dpi ratio none constant (default) .sslCrtPath(path: String) | --ssl-crt-path Path to the ssl client cert public key in OpenSSL PEM format, optionally followed by intermediate ca and trusted certs .sslKeyPassword(String) | --ssl-key-password Password to ssl client cert private key .sslKeyPath(path: String) | --ssl-key-path Path to ssl client cert private key in OpenSSL PEM format .stopSlowScripts | --stop-slow-scripts Stop slow running javascripts (default) .noStopSlowScripts | --no-stop-slow-scripts Do not Stop slow running javascripts .disableTocBackLinks | --disable-toc-back-links Do not link from section header to toc (default) .enableTocBackLinks | --enable-toc-back-links Link from section header to toc .userStyleSheet(url: String) | --user-style-sheet Specify a user style sheet, to load with every page .username(String) | --username HTTP Authentication username .viewportSize(String) | --viewport-size <> Set viewport size if you have custom scrollbars or css attribute overflow to emulate window size .windowStatus(String) | --window-status Wait until window.status is equal to this string before rendering page .zoom(Float) | --zoom Use this zoom factor (default 1)

Please feel free to contribute!

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