wkhtmltopdf, 0.12.6, Warning: Blocked access to file

Question

When upgrade wkhtmltopdf to 0.12.6, it came to such messages and the image did not show in the target pdf:

    Warning: Blocked access to file /path/to/bpa_product_layering.png

BTW, the same source html file works well with 0.12.5

Spinks

Answer 1

This is caused by the change of default behavior in version 0.12.6 of wkhtmltopdf. wkhtmltopdf disables local file access by default now. It could be solved by adding the command line parameter

--enable-local-file-access

or the combination

--disable-local-file-access --allow <path>

Spinks

please add an example..how can i add command line parameter? i am using phthon – Bisson

@sanjay, I ran into the same issue with Python, you can pass in options in the form of a dictionary. In this case, you could use the option "disable-local-file-access":"". – Luik

when you get this, when using pandoc then use pandoc --pdf-engine-opt=--enable-local-file-access – Peewit

i have same problem in symfphony any idea how to finx it ? snapy pdf library – Bryannabryansk

Just using --allow works for me on version 0.12.6. – Colman

This is almost right, but insufficient/incorrect - c.f. @Shrimp's answer below for the extra correction needed. – Aracelyaraceous

Can we allow multiple paths ? or with a regex ? or with something like */my/very/last/folder ? – Lucillalucille

Answer 2

For those that are using laravel-snappy, add the 'enable-local-file-access' option in the config\snappy.php:

'pdf' => [
        'enabled' => true,
        'binary'  => env('WKHTML_PDF_BINARY', '/usr/local/bin/wkhtmltopdf'),
        'timeout' => false,
        'options' => [
            'enable-local-file-access' => true,
            'orientation'   => 'landscape',
            'encoding'      => 'UTF-8'
        ],
        'env'     => [],
    ],

    'image' => [
        'enabled' => true,
        'binary'  => env('WKHTML_IMG_BINARY', '/usr/local/bin/wkhtmltoimage'),
        'timeout' => false,
        'options' => [
            'enable-local-file-access' => true,
            'orientation'   => 'landscape',
            'encoding'      => 'UTF-8'
        ],
        'env'     => [],
    ],

wkhtmltopdf disables local file access by default in the 0.12.6 version

Permalloy

Answer 3

Just bumping this thread with a correction in case you're still getting the same error in spite of using:

--enable-local-file-access

For some reason, this cmd line argument does not work when being specified after input/output files, you have to write this argument right after wkhtmltopdf.exe.

So

wkhtmltopdf.exe --enable-local-file-access input.html output.pdf

instead of other variants.

Tricuspid

Yes, the sequence matters. In 0.12.4, it was fine... – Bluepoint

Answer 4

in my case, I put "enable-local-file-access": "", in options, it worked.

Gamble

Answer 5

In Windows with Python, I came across a similar error as well when running code:

result = imgkit.from_file('postlayout.A.html', 'out.jpg', config=wkhtmltoimage_binaries)

Error:

Warning: Blocked access to file C:/XXXXXX/background.A.jpg

Error: Failed to load about:blank, with network status code 301 and http status code 0 - Protocol "about" is unknown

What I did to resolve this:

Add variable options

kitoptions = {
  "enable-local-file-access": None
}

Add options to call

FROM

result = imgkit.from_file('postlayout.A.html', 'out.jpg', config=wkhtmltoimage_binaries)

TO

result = imgkit.from_file('postlayout.A.html', 'out.jpg', config=wkhtmltoimage_binaries, options=kitoptions)

Full Source:

import imgkit

#library path to kit
path_wkthmltopdf = r'C:\Program Files\wkhtmltopdf\bin\wkhtmltoimage.exe'
wkhtmltoimage_binaries  = imgkit.config(wkhtmltoimage=path_wkthmltopdf)

#OPTIONS
kitoptions = {
  "enable-local-file-access": None
}

html_file_directory = r'C:\XXXX\template'

result = imgkit.from_file('postlayout.A.html', 'out.jpg', config=wkhtmltoimage_binaries, options=kitoptions)
if result:
    print("successful")
else:
    print("failed")

Pieria

Answer 6

For the C API, contrary to what the documentation says, it's not load.blockLocalFileAccess but loadPage.blockLocalFileAccess that you must set to "false":

wkhtmltoimage_set_global_setting(settings, "loadPage.blockLocalFileAccess", "false");

Hopefully, the documentation will be updated soon; see issue #4763.

Canonicals

Answer 7

I confirm that the problem comes from the wkhtmltopdf version. For those on Symfony (3.4), just add an option in config.yml:

knp_snappy:
    pdf:
        options:
            enable-local-file-access: true

Amaro

Answer 8

I know am a bit late in party but just wanted to write clear example with c# here so one can understand clearly.

ProcessStartInfo proc = new ProcessStartInfo();
        proc = new ProcessStartInfo();
        proc.RedirectStandardError = true;
        proc.UseShellExecute = false;
        proc.WorkingDirectory = @"" + Config.WkhtmltopdfPath;
        proc.FileName = @"" + Config.WkhtmltopdfPath + @"\wkhtmltopdf.exe";
        proc.Arguments = @"  --enable-local-file-access -T 0 -B 0 --page-width 210mm --page-height 450mm " + fileName + ".html " + fileName + ".pdf";
        Process inkscape = Process.Start(proc);

Equilateral