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

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This commit is contained in:
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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12
pkg/modules/pdfengines/pdfengines.go
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@@ -32,6 +32,7 @@ type PdfEngines struct {
splitNames []string
flattenNames []string
convertNames []string
optimizeImagesNames []string
readMetadataNames []string
writeMetadataNames []string
encryptNames []string
@@ -57,6 +58,7 @@ func (mod *PdfEngines) Descriptor() gotenberg.ModuleDescriptor {
fs.StringSlice("pdfengines-split-engines", []string{"pdfcpu", "qpdf", "pdftk"}, "Set the PDF engines and their order for the split feature - empty means all")
fs.StringSlice("pdfengines-flatten-engines", []string{"qpdf"}, "Set the PDF engines and their order for the flatten feature - empty means all")
fs.StringSlice("pdfengines-convert-engines", []string{"libreoffice-pdfengine"}, "Set the PDF engines and their order for the convert feature - empty means all")
fs.StringSlice("pdfengines-optimize-images-engines", []string{"pdfcpu"}, "Set the PDF engines and their order for the image optimization feature - empty means all")
fs.StringSlice("pdfengines-read-metadata-engines", []string{"exiftool"}, "Set the PDF engines and their order for the read metadata feature - empty means all")
fs.StringSlice("pdfengines-write-metadata-engines", []string{"exiftool"}, "Set the PDF engines and their order for the write metadata feature - empty means all")
fs.StringSlice("pdfengines-encrypt-engines", []string{"qpdf", "pdftk", "pdfcpu"}, "Set the PDF engines and their order for the password protection feature - empty means all")
@@ -91,6 +93,7 @@ func (mod *PdfEngines) Provision(ctx *gotenberg.Context) error {
splitNames := flags.MustStringSlice("pdfengines-split-engines")
flattenNames := flags.MustStringSlice("pdfengines-flatten-engines")
convertNames := flags.MustStringSlice("pdfengines-convert-engines")
optimizeImagesNames := flags.MustStringSlice("pdfengines-optimize-images-engines")
readMetadataNames := flags.MustStringSlice("pdfengines-read-metadata-engines")
writeMetadataNames := flags.MustStringSlice("pdfengines-write-metadata-engines")
encryptNames := flags.MustStringSlice("pdfengines-encrypt-engines")
@@ -148,6 +151,11 @@ func (mod *PdfEngines) Provision(ctx *gotenberg.Context) error {
mod.convertNames = convertNames
}
mod.optimizeImagesNames = defaultNames
if len(optimizeImagesNames) > 0 {
mod.optimizeImagesNames = optimizeImagesNames
}
mod.readMetadataNames = defaultNames
if len(readMetadataNames) > 0 {
mod.readMetadataNames = readMetadataNames
@@ -247,6 +255,7 @@ func (mod *PdfEngines) Validate() error {
findNonExistingEngines(mod.mergeNames)
findNonExistingEngines(mod.splitNames)
findNonExistingEngines(mod.flattenNames)
findNonExistingEngines(mod.optimizeImagesNames)
findNonExistingEngines(mod.convertNames)
findNonExistingEngines(mod.readMetadataNames)
findNonExistingEngines(mod.writeMetadataNames)
@@ -275,6 +284,7 @@ func (mod *PdfEngines) SystemMessages() []string {
fmt.Sprintf("split engines - %s", strings.Join(mod.splitNames, " ")),
fmt.Sprintf("flatten engines - %s", strings.Join(mod.flattenNames, " ")),
fmt.Sprintf("convert engines - %s", strings.Join(mod.convertNames, " ")),
fmt.Sprintf("optimize images engines - %s", strings.Join(mod.optimizeImagesNames, " ")),
fmt.Sprintf("read metadata engines - %s", strings.Join(mod.readMetadataNames, " ")),
fmt.Sprintf("write metadata engines - %s", strings.Join(mod.writeMetadataNames, " ")),
fmt.Sprintf("encrypt engines - %s", strings.Join(mod.encryptNames, " ")),
@@ -310,6 +320,7 @@ func (mod *PdfEngines) PdfEngine() (gotenberg.PdfEngine, error) {
engines(mod.splitNames),
engines(mod.flattenNames),
engines(mod.convertNames),
engines(mod.optimizeImagesNames),
engines(mod.readMetadataNames),
engines(mod.writeMetadataNames),
engines(mod.encryptNames),
@@ -341,6 +352,7 @@ func (mod *PdfEngines) Routes() ([]api.Route, error) {
mergeRoute(engine),
splitRoute(engine),
flattenRoute(engine),
optimizeRoute(engine),
convertRoute(engine),
readMetadataRoute(engine),
writeMetadataRoute(engine),