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feat(pdfengines): optimize PDF images to reduce file size (#359)

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Julien Neuhart
2026-08-13 19:39:09 +02:00
parent 7a730cfdc2
commit 1ac1d9887e
29 changed files with 776 additions and 5 deletions
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test/integration/features/pdfengines_optimize.feature Normal file
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@pdfengines
@pdfengines-optimize
@optimize
Feature: /forms/pdfengines/optimize
# image-heavy.pdf is a ~710 KB PDF whose single image Chromium embedded
# losslessly (FlateDecode). Re-encoding it to JPEG shrinks the file well
# below this threshold while leaving the structure intact.
# See https://github.com/gotenberg/gotenberg/issues/359.
Scenario: POST /forms/pdfengines/optimize (Image-heavy PDF)
Given I have a default Gotenberg container
When I make a "POST" request to Gotenberg at the "/forms/pdfengines/optimize" endpoint with the following form data and header(s):
| files | testdata/image-heavy.pdf | file |
| Gotenberg-Output-Filename | foo | header |
Then the response status code should be 200
Then the response header "Content-Type" should be "application/pdf"
Then there should be 1 PDF(s) in the response
Then the "foo.pdf" file size should be less than 300 KB
Scenario: POST /forms/pdfengines/optimize (Custom Image Quality)
Given I have a default Gotenberg container
When I make a "POST" request to Gotenberg at the "/forms/pdfengines/optimize" endpoint with the following form data and header(s):
| files | testdata/image-heavy.pdf | file |
| imageQuality | 40 | field |
| Gotenberg-Output-Filename | foo | header |
Then the response status code should be 200
Then the "foo.pdf" file size should be less than 300 KB
Scenario: POST /forms/pdfengines/optimize (PDF Without Images)
Given I have a default Gotenberg container
When I make a "POST" request to Gotenberg at the "/forms/pdfengines/optimize" endpoint with the following form data and header(s):
| files | testdata/page_1.pdf | file |
Then the response status code should be 200
Then the response header "Content-Type" should be "application/pdf"
Then there should be 1 PDF(s) in the response
Scenario: POST /forms/pdfengines/optimize (Invalid Image Quality)
Given I have a default Gotenberg container
When I make a "POST" request to Gotenberg at the "/forms/pdfengines/optimize" endpoint with the following form data and header(s):
| files | testdata/image-heavy.pdf | file |
| imageQuality | 200 | field |
Then the response status code should be 400
Then the response header "Content-Type" should be "text/plain; charset=UTF-8"
Scenario: POST /forms/pdfengines/optimize (Bad Request)
Given I have a default Gotenberg container
When I make a "POST" request to Gotenberg at the "/forms/pdfengines/optimize" endpoint with the following form data and header(s):
| Gotenberg-Output-Filename | foo | header |
Then the response status code should be 400
Then the response header "Content-Type" should be "text/plain; charset=UTF-8"
Then the response body should match string:
"""
Invalid form data: no form file found for extensions: [.pdf]
"""
Scenario: POST /forms/pdfengines/optimize (Routes Disabled)
Given I have a Gotenberg container with the following environment variable(s):
| PDFENGINES_DISABLE_ROUTES | true |
When I make a "POST" request to Gotenberg at the "/forms/pdfengines/optimize" endpoint with the following form data and header(s):
| files | testdata/image-heavy.pdf | file |
Then the response status code should be 404