mirror of
https://github.com/MontFerret/ferret.git
synced 2024-12-23 01:24:30 +02:00
306 lines
7.8 KiB
Go
306 lines
7.8 KiB
Go
package html
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import (
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"context"
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"fmt"
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"regexp"
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"github.com/MontFerret/ferret/pkg/drivers"
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"github.com/MontFerret/ferret/pkg/runtime/core"
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"github.com/MontFerret/ferret/pkg/runtime/values"
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"github.com/MontFerret/ferret/pkg/runtime/values/types"
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)
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func ValidatePageRanges(pageRanges string) (bool, error) {
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match, err := regexp.Match(`^(([1-9][0-9]*|[1-9][0-9]*)(\s*-\s*|\s*,\s*|))*$`, []byte(pageRanges))
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if err != nil {
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return false, err
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}
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return match, nil
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}
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// PDF print a PDF of the current page.
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// @param target (HTMLPage|String) - Target page or url.
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// @param params (Object) - Optional, An object containing the following properties :
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// Landscape (Bool) - Paper orientation. Defaults to false.
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// DisplayHeaderFooter (Bool) - Display header and footer. Defaults to false.
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// PrintBackground (Bool) - Print background graphics. Defaults to false.
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// Scale (Float64) - Scale of the webpage rendering. Defaults to 1.
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// PaperWidth (Float64) - Paper width in inches. Defaults to 8.5 inches.
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// PaperHeight (Float64) - Paper height in inches. Defaults to 11 inches.
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// MarginTop (Float64) - Top margin in inches. Defaults to 1cm (~0.4 inches).
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// MarginBottom (Float64) - Bottom margin in inches. Defaults to 1cm (~0.4 inches).
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// MarginLeft (Float64) - Left margin in inches. Defaults to 1cm (~0.4 inches).
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// MarginRight (Float64) - Right margin in inches. Defaults to 1cm (~0.4 inches).
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// PageRanges (String) - Paper ranges to print, e.g., '1-5, 8, 11-13'. Defaults to the empty string, which means print all pages.
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// IgnoreInvalidPageRanges (Bool) - to silently ignore invalid but successfully parsed page ranges, such as '3-2'. Defaults to false.
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// HeaderTemplate (String) - HTML template for the print header. Should be valid HTML markup with following classes used to inject printing values into them: - `date`: formatted print date - `title`: document title - `url`: document location - `pageNumber`: current page number - `totalPages`: total pages in the document For example, `<span class=title></span>` would generate span containing the title.
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// FooterTemplate (String) - HTML template for the print footer. Should use the same format as the `headerTemplate`.
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// PreferCSSPageSize (Bool) - Whether or not to prefer page size as defined by css. Defaults to false, in which case the content will be scaled to fit the paper size. *
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// @returns data (Binary) - Returns a base64 encoded string in binary format.
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func PDF(ctx context.Context, args ...core.Value) (core.Value, error) {
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err := core.ValidateArgs(args, 1, 2)
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if err != nil {
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return values.None, err
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}
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arg1 := args[0]
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page, closeAfter, err := OpenOrCastPage(ctx, arg1)
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if err != nil {
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return values.None, err
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}
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defer func() {
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if closeAfter {
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page.Close()
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}
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}()
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pdfParams := drivers.PDFParams{}
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if len(args) == 2 {
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arg2 := args[1]
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err = core.ValidateType(arg2, types.Object)
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if err != nil {
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return values.None, err
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}
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params, ok := arg2.(*values.Object)
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if !ok {
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return values.None, core.Error(core.ErrInvalidType, "expected object")
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}
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landscape, found := params.Get("landscape")
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if found {
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err = core.ValidateType(landscape, types.Boolean)
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if err != nil {
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return values.None, err
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}
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pdfParams.Landscape = landscape.(values.Boolean)
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}
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displayHeaderFooter, found := params.Get("displayHeaderFooter")
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if found {
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err = core.ValidateType(displayHeaderFooter, types.Boolean)
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if err != nil {
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return values.None, err
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}
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pdfParams.DisplayHeaderFooter = displayHeaderFooter.(values.Boolean)
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}
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printBackground, found := params.Get("printBackground")
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if found {
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err = core.ValidateType(printBackground, types.Boolean)
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if err != nil {
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return values.None, err
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}
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pdfParams.PrintBackground = printBackground.(values.Boolean)
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}
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scale, found := params.Get("scale")
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if found {
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err = core.ValidateType(scale, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if scale.Type() == types.Int {
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pdfParams.Scale = values.Float(scale.(values.Int))
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} else {
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pdfParams.Scale = scale.(values.Float)
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}
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}
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paperWidth, found := params.Get("paperWidth")
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if found {
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err = core.ValidateType(paperWidth, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if paperWidth.Type() == types.Int {
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pdfParams.PaperWidth = values.Float(paperWidth.(values.Int))
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} else {
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pdfParams.PaperWidth = paperWidth.(values.Float)
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}
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}
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paperHeight, found := params.Get("paperHeight")
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if found {
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err = core.ValidateType(paperHeight, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if paperHeight.Type() == types.Int {
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pdfParams.PaperHeight = values.Float(paperHeight.(values.Int))
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} else {
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pdfParams.PaperHeight = paperHeight.(values.Float)
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}
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}
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marginTop, found := params.Get("marginTop")
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if found {
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err = core.ValidateType(marginTop, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if marginTop.Type() == types.Int {
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pdfParams.MarginTop = values.Float(marginTop.(values.Int))
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} else {
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pdfParams.MarginTop = marginTop.(values.Float)
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}
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}
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marginBottom, found := params.Get("marginBottom")
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if found {
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err = core.ValidateType(marginBottom, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if marginBottom.Type() == types.Int {
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pdfParams.MarginBottom = values.Float(marginBottom.(values.Int))
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} else {
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pdfParams.MarginBottom = marginBottom.(values.Float)
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}
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}
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marginLeft, found := params.Get("marginLeft")
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if found {
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err = core.ValidateType(marginLeft, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if marginLeft.Type() == types.Int {
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pdfParams.MarginLeft = values.Float(marginLeft.(values.Int))
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} else {
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pdfParams.MarginLeft = marginLeft.(values.Float)
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}
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}
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marginRight, found := params.Get("marginRight")
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if found {
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err = core.ValidateType(marginRight, types.Float, types.Int)
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if err != nil {
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return values.None, err
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}
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if marginRight.Type() == types.Int {
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pdfParams.MarginRight = values.Float(marginRight.(values.Int))
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} else {
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pdfParams.MarginRight = marginRight.(values.Float)
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}
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}
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pageRanges, found := params.Get("pageRanges")
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if found {
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err = core.ValidateType(pageRanges, types.String)
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if err != nil {
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return values.None, err
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}
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validate, err := ValidatePageRanges(pageRanges.String())
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if err != nil {
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return values.None, err
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}
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if !validate {
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return values.None, core.Error(core.ErrInvalidArgument, fmt.Sprintf(`page ranges "%s", not valid`, pageRanges.String()))
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}
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pdfParams.PageRanges = pageRanges.(values.String)
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}
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ignoreInvalidPageRanges, found := params.Get("ignoreInvalidPageRanges")
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if found {
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err = core.ValidateType(ignoreInvalidPageRanges, types.Boolean)
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if err != nil {
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return values.None, err
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}
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pdfParams.IgnoreInvalidPageRanges = ignoreInvalidPageRanges.(values.Boolean)
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}
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headerTemplate, found := params.Get("headerTemplate")
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if found {
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err = core.ValidateType(headerTemplate, types.String)
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if err != nil {
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return values.None, err
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}
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pdfParams.HeaderTemplate = headerTemplate.(values.String)
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}
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footerTemplate, found := params.Get("footerTemplate")
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if found {
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err = core.ValidateType(footerTemplate, types.String)
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if err != nil {
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return values.None, err
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}
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pdfParams.FooterTemplate = footerTemplate.(values.String)
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}
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preferCSSPageSize, found := params.Get("preferCSSPageSize")
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if found {
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err = core.ValidateType(preferCSSPageSize, types.Boolean)
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if err != nil {
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return values.None, err
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}
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pdfParams.PreferCSSPageSize = preferCSSPageSize.(values.Boolean)
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}
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}
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pdf, err := page.PrintToPDF(ctx, pdfParams)
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if err != nil {
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return values.None, err
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}
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return pdf, nil
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}
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