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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/printing/browser/print_to_pdf/pdf_print_utils.h"
#include <string_view>
#include <variant>
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "components/printing/browser/print_manager_utils.h"
#include "components/printing/common/print_params.h"
#include "printing/print_settings.h"
#include "printing/units.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/size_f.h"
#include "url/url_canon.h"
namespace print_to_pdf {
namespace {
// The max and min value should match the ones in scaling_settings.html.
// Update both files at the same time.
static constexpr double kScaleMaxVal = 200;
static constexpr double kScaleMinVal = 10;
// Set default margin to 1.0cm = ~2/5 of an inch.
static constexpr double kDefaultMarginInMM = 10.0;
static constexpr double kMMPerInch = printing::kMicronsPerMil;
static constexpr double kDefaultMarginInInches =
kDefaultMarginInMM / kMMPerInch;
} // namespace
std::variant<printing::PageRanges, PdfPrintResult> TextPageRangesToPageRanges(
std::string_view page_range_text) {
printing::PageRanges page_ranges;
for (const auto& range_string :
base::SplitStringPiece(page_range_text, ",", base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY)) {
printing::PageRange range;
if (range_string.find("-") == std::string_view::npos) {
if (!base::StringToUint(range_string, &range.from))
return PdfPrintResult::kPageRangeSyntaxError;
range.to = range.from;
} else if (range_string == "-") {
range.from = 1;
// Set last page to max value so it gets capped with actual
// page count once it becomes known in renderer during printing.
static_assert(printing::PageRange::kMaxPage <
std::numeric_limits<uint32_t>::max());
range.to = printing::PageRange::kMaxPage + 1;
} else if (base::StartsWith(range_string, "-")) {
range.from = 1;
if (!base::StringToUint(range_string.substr(1), &range.to))
return PdfPrintResult::kPageRangeSyntaxError;
} else if (base::EndsWith(range_string, "-")) {
// See comment regarding kMaxPage above.
range.to = printing::PageRange::kMaxPage + 1;
if (!base::StringToUint(range_string.substr(0, range_string.length() - 1),
&range.from)) {
return PdfPrintResult::kPageRangeSyntaxError;
}
} else {
auto tokens = base::SplitStringPiece(
range_string, "-", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
if (tokens.size() != 2 || !base::StringToUint(tokens[0], &range.from) ||
!base::StringToUint(tokens[1], &range.to)) {
return PdfPrintResult::kPageRangeSyntaxError;
}
}
if (range.from < 1 || range.from > range.to)
return PdfPrintResult::kPageRangeInvalidRange;
// Page numbers are 1-based in the dictionary.
// Page numbers are 0-based for the print settings.
page_ranges.push_back({range.from - 1, range.to - 1});
}
return page_ranges;
}
std::variant<printing::mojom::PrintPagesParamsPtr, std::string>
GetPrintPagesParams(const GURL& page_url,
std::optional<bool> landscape,
std::optional<bool> display_header_footer,
std::optional<bool> print_background,
std::optional<double> scale,
std::optional<double> paper_width,
std::optional<double> paper_height,
std::optional<double> margin_top,
std::optional<double> margin_bottom,
std::optional<double> margin_left,
std::optional<double> margin_right,
std::optional<std::string> header_template,
std::optional<std::string> footer_template,
std::optional<bool> prefer_css_page_size,
std::optional<bool> generate_tagged_pdf,
std::optional<bool> generate_document_outline) {
printing::PrintSettings print_settings;
print_settings.set_dpi(printing::kPointsPerInch);
print_settings.SetOrientation(landscape.value_or(false));
print_settings.set_should_print_backgrounds(print_background.value_or(false));
print_settings.set_display_header_footer(
display_header_footer.value_or(false));
if (print_settings.display_header_footer()) {
GURL::Replacements url_sanitizer;
url_sanitizer.ClearUsername();
url_sanitizer.ClearPassword();
std::string url = page_url.ReplaceComponents(url_sanitizer).spec();
print_settings.set_url(base::UTF8ToUTF16(url));
}
print_settings.set_scale_factor(scale.value_or(1.0));
if (print_settings.scale_factor() > kScaleMaxVal / 100 ||
print_settings.scale_factor() < kScaleMinVal / 100) {
return "scale is outside of [0.1 - 2] range";
}
double margin_left_in_inches = margin_left.value_or(kDefaultMarginInInches);
double margin_right_in_inches = margin_right.value_or(kDefaultMarginInInches);
double margin_top_in_inches = margin_top.value_or(kDefaultMarginInInches);
double margin_bottom_in_inches =
margin_bottom.value_or(kDefaultMarginInInches);
if (margin_left_in_inches < 0)
return "left margin is negative";
if (margin_right_in_inches < 0)
return "right margin is negative";
if (margin_top_in_inches < 0)
return "top margin is negative";
if (margin_bottom_in_inches < 0)
return "bottom margin is negative";
printing::PageMargins margins_in_microns;
margins_in_microns.left = printing::ConvertUnit(
base::ClampFloor(margin_left_in_inches * printing::kPointsPerInch),
printing::kPointsPerInch, printing::kMicronsPerInch);
margins_in_microns.right = printing::ConvertUnit(
base::ClampFloor(margin_right_in_inches * printing::kPointsPerInch),
printing::kPointsPerInch, printing::kMicronsPerInch);
margins_in_microns.top = printing::ConvertUnit(
base::ClampFloor(margin_top_in_inches * printing::kPointsPerInch),
printing::kPointsPerInch, printing::kMicronsPerInch);
margins_in_microns.bottom = printing::ConvertUnit(
base::ClampFloor(margin_bottom_in_inches * printing::kPointsPerInch),
printing::kPointsPerInch, printing::kMicronsPerInch);
print_settings.SetCustomMargins(margins_in_microns);
double paper_width_in_inches =
paper_width.value_or(printing::kLetterWidthInch);
double paper_height_in_inches =
paper_height.value_or(printing::kLetterHeightInch);
if (paper_width_in_inches <= 0)
return "paper width is zero or negative";
if (paper_height_in_inches <= 0)
return "paper height is zero or negative";
gfx::Size paper_size_in_points = gfx::ToCeiledSize(
gfx::SizeF(paper_width_in_inches * printing::kPointsPerInch,
paper_height_in_inches * printing::kPointsPerInch));
gfx::Rect printable_area_device_units(paper_size_in_points);
print_settings.SetPrinterPrintableArea(paper_size_in_points,
printable_area_device_units, true);
auto print_pages_params = printing::mojom::PrintPagesParams::New();
print_pages_params->params = printing::mojom::PrintParams::New();
printing::RenderParamsFromPrintSettings(print_settings,
print_pages_params->params.get());
print_pages_params->params->print_to_pdf = true;
print_pages_params->params->document_cookie =
printing::PrintSettings::NewCookie();
print_pages_params->params->header_template =
base::UTF8ToUTF16(header_template.value_or(""));
print_pages_params->params->footer_template =
base::UTF8ToUTF16(footer_template.value_or(""));
print_pages_params->params->prefer_css_page_size =
prefer_css_page_size.value_or(false);
print_pages_params->params->generate_tagged_pdf = generate_tagged_pdf;
using GenerateDocumentOutline = printing::mojom::GenerateDocumentOutline;
print_pages_params->params->generate_document_outline =
generate_document_outline.value_or(false)
? GenerateDocumentOutline::kFromAccessibilityTreeHeaders
: GenerateDocumentOutline::kNone;
CHECK(!print_pages_params->params->page_size.IsEmpty())
<< print_pages_params->params->page_size.ToString();
if (print_pages_params->params->printable_area.IsEmpty()) {
return "invalid print parameters: printable area is empty";
}
if (print_pages_params->params->content_size.IsEmpty()) {
return "invalid print parameters: content area is empty";
}
if (!printing::PrintMsgPrintParamsIsValid(*print_pages_params->params)) {
return "invalid print parameters";
}
return print_pages_params;
}
} // namespace print_to_pdf
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