556 lines
18 KiB
TypeScript
556 lines
18 KiB
TypeScript
import { HttpHeaders } from '@angular/common/http';
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import { Injectable } from '@angular/core';
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import { saveAs } from 'file-saver';
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import pdfMake from 'pdfmake/build/pdfmake';
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import { TranslateService } from '@ngx-translate/core';
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import { ConfigService } from './config.service';
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import { HttpService } from '../core-services/http.service';
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/**
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* Provides the general document structure for PDF documents, such as page margins, header, footer and styles.
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* Also provides general purpose open and download functions.
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*
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* Use a local pdf service (i.e. MotionPdfService) to get the document definition for the content and use this service to
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* open or download the pdf document
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*
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* @example
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* ```ts
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* const motionContent = this.motionPdfService.motionToDocDef(this.motion);
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* this.this.pdfDocumentService.open(motionContent);
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* ```
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*/
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@Injectable({
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providedIn: 'root'
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})
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export class PdfDocumentService {
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/**
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* A list of all images to add to the virtual file system.
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* May still be filling at header and footer creation
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*/
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private imageUrls: string[] = [];
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/**
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* Constructor
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*
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* @param translate translations
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* @param configService read config values
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* @param mediaManageService to read out font files as media data
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*/
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public constructor(
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private translate: TranslateService,
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private configService: ConfigService,
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private httpService: HttpService
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) {}
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/**
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* Define the pdfmake virtual file system, adding the fonts
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*
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* @returns the vfs-object
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*/
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private async initVfs(): Promise<object> {
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const fontPathList: string[] = Array.from(
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// create a list without redundancies
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new Set(
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this.configService
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.instant<string[]>('fonts_available')
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.map(available => this.configService.instant<any>(available))
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.map(font => font.path || `/${font.default}`)
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)
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);
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const promises = fontPathList.map(fontPath => {
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return this.convertUrlToBase64(fontPath).then(base64 => {
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return {
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[fontPath.split('/').pop()]: base64
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};
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});
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});
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const binaryDataUrls = await Promise.all(promises);
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let vfs = {};
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binaryDataUrls.map(entry => {
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vfs = {
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...vfs,
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...entry
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};
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});
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return vfs;
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}
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/**
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* Retrieves a binary file from the url and returns a base64 value
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*
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* @param url file url
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* @returns a promise with a base64 string
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*/
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private async convertUrlToBase64(url: string): Promise<string> {
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return new Promise<string>((resolve, reject) => {
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const headers = new HttpHeaders();
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this.httpService.get<Blob>(url, {}, {}, headers, 'blob').then(file => {
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const reader = new FileReader();
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reader.readAsDataURL(file);
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reader.onload = () => {
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const resultStr: string = reader.result as string;
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resolve(resultStr.split(',')[1]);
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};
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reader.onerror = error => {
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reject(error);
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};
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});
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});
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}
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/**
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* Returns the name of a font from the value of the given
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* config variable.
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*
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* @param fontType the config variable of the font (font_regular, font_italic)
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* @returns the name of the selected font
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*/
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private getFontName(fontType: string): string {
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const font = this.configService.instant<any>(fontType);
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return (font.path || `/${font.default}`).split('/').pop();
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}
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/**
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* Overall document definition and styles for the most PDF documents
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*
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* @param documentContent the content of the pdf as object
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* @param metadata
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* @param imageUrls Array of optional images (url, placeholder) to be inserted
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* @param customMargins optionally overrides the margins
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* @param landscape optional landscape page orientation instead of default portrait
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* @returns the pdf document definition ready to export
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*/
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private async getStandardPaper(
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documentContent: object,
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metadata?: object,
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imageUrls?: string[],
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customMargins?: [number, number, number, number],
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landscape?: boolean
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): Promise<object> {
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this.initFonts();
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this.imageUrls = imageUrls ? imageUrls : [];
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pdfMake.vfs = await this.initVfs();
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const result = {
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pageSize: 'A4',
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pageOrientation: landscape ? 'landscape' : 'portrait',
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pageMargins: customMargins || [75, 90, 75, 75],
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defaultStyle: {
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font: 'PdfFont',
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fontSize: this.configService.instant('general_export_pdf_fontsize')
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},
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header: this.getHeader(customMargins ? [customMargins[0], customMargins[2]] : null),
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// TODO: option for no footer, wherever this can be defined
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footer: (currentPage, pageCount) => {
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return this.getFooter(
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currentPage,
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pageCount,
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customMargins ? [customMargins[0], customMargins[2]] : null
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);
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},
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info: metadata,
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content: documentContent,
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styles: this.getStandardPaperStyles()
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};
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await this.loadAllImages();
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return result;
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}
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/**
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* Overall document definition and styles for blank PDF documents
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* (e.g. ballots)
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*
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* @param documentContent the content of the pdf as object
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* @param imageUrl an optional image to insert into the ballot
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* @returns the pdf document definition ready to export
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*/
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private async getBallotPaper(documentContent: object, imageUrl?: string): Promise<object> {
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this.initFonts();
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this.imageUrls = imageUrl ? [imageUrl] : [];
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pdfMake.vfs = await this.initVfs();
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const result = {
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pageSize: 'A4',
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pageMargins: [0, 0, 0, 0],
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defaultStyle: {
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font: 'PdfFont',
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fontSize: 10
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},
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content: documentContent,
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styles: this.getBlankPaperStyles()
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};
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await this.loadAllImages();
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return result;
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}
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/**
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* Define the fonts
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*/
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private initFonts(): void {
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pdfMake.fonts = {
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PdfFont: {
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normal: this.getFontName('font_regular'),
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bold: this.getFontName('font_bold'),
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italics: this.getFontName('font_italic'),
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bolditalics: this.getFontName('font_bold_italic')
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}
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};
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}
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/**
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* Creates the header doc definition for normal PDF documents
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*
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* @param lrMargin optional margin overrides
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* @returns an object that contains the necessary header definition
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*/
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private getHeader(lrMargin?: [number, number]): object {
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// check for the required logos
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let logoHeaderLeftUrl = this.configService.instant<any>('logo_pdf_header_L').path;
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let logoHeaderRightUrl = this.configService.instant<any>('logo_pdf_header_R').path;
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let text;
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const columns = [];
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// add the left logo to the header column
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if (logoHeaderLeftUrl) {
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if (logoHeaderLeftUrl.indexOf('/') === 0) {
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logoHeaderLeftUrl = logoHeaderLeftUrl.substr(1); // remove trailing /
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}
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columns.push({
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image: logoHeaderLeftUrl,
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fit: [180, 40],
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width: '20%'
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});
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this.imageUrls.push(logoHeaderLeftUrl);
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}
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// add the header text if no logo on the right was specified
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if (logoHeaderLeftUrl && logoHeaderRightUrl) {
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text = '';
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} else {
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const line1 = [
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this.translate.instant(this.configService.instant('general_event_name')),
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this.translate.instant(this.configService.instant('general_event_description'))
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]
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.filter(Boolean)
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.join(' – ');
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const line2 = [
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this.configService.instant('general_event_location'),
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this.configService.instant('general_event_date')
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]
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.filter(Boolean)
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.join(', ');
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text = [line1, line2].join('\n');
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}
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columns.push({
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text: text,
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style: 'headerText',
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alignment: logoHeaderRightUrl ? 'left' : 'right'
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});
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// add the logo to the right
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if (logoHeaderRightUrl) {
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if (logoHeaderRightUrl.indexOf('/') === 0) {
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logoHeaderRightUrl = logoHeaderRightUrl.substr(1); // remove trailing /
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}
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columns.push({
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image: logoHeaderRightUrl,
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fit: [180, 40],
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alignment: 'right',
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width: '20%'
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});
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this.imageUrls.push(logoHeaderRightUrl);
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}
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const margin = [lrMargin ? lrMargin[0] : 75, 30, lrMargin ? lrMargin[0] : 75, 10];
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// pdfmake order: [left, top, right, bottom]
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return {
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color: '#555',
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fontSize: 9,
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margin: margin,
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columns: columns,
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columnGap: 10
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};
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}
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/**
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* Creates the footer doc definition for normal PDF documents.
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* Adds page numbers into the footer
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*
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* TODO: Add footer logos.
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*
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* @param currentPage holds the number of the current page
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* @param pageCount holds the page count
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* @param lrMargin optionally overriding the margins
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* @returns the footer doc definition
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*/
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private getFooter(currentPage: number, pageCount: number, lrMargin?: [number, number]): object {
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const columns = [];
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let logoContainerWidth: string;
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let pageNumberPosition: string;
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let logoContainerSize: Array<number>;
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let logoFooterLeftUrl = this.configService.instant<any>('logo_pdf_footer_L').path;
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let logoFooterRightUrl = this.configService.instant<any>('logo_pdf_footer_R').path;
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// if there is a single logo, give it a lot of space
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if (logoFooterLeftUrl && logoFooterRightUrl) {
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logoContainerWidth = '20%';
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logoContainerSize = [180, 40];
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} else {
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logoContainerWidth = '80%';
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logoContainerSize = [400, 50];
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}
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// the position of the page number depends on the logos
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if (logoFooterLeftUrl && logoFooterRightUrl) {
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pageNumberPosition = 'center';
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} else if (logoFooterLeftUrl && !logoFooterRightUrl) {
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pageNumberPosition = 'right';
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} else if (logoFooterRightUrl && !logoFooterLeftUrl) {
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pageNumberPosition = 'left';
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} else {
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pageNumberPosition = this.configService.instant('general_export_pdf_pagenumber_alignment');
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}
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// add the left footer logo, if any
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if (logoFooterLeftUrl) {
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if (logoFooterLeftUrl.indexOf('/') === 0) {
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logoFooterLeftUrl = logoFooterLeftUrl.substr(1); // remove trailing /
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}
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columns.push({
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image: logoFooterLeftUrl,
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fit: logoContainerSize,
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width: logoContainerWidth,
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alignment: 'left'
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});
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this.imageUrls.push(logoFooterLeftUrl);
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}
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// add the page number
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columns.push({
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text: `${currentPage} / ${pageCount}`,
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style: 'footerPageNumber',
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alignment: pageNumberPosition
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});
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// add the right footer logo, if any
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if (logoFooterRightUrl) {
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if (logoFooterRightUrl.indexOf('/') === 0) {
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logoFooterRightUrl = logoFooterRightUrl.substr(1); // remove trailing /
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}
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columns.push({
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image: logoFooterRightUrl,
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fit: logoContainerSize,
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width: logoContainerWidth,
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alignment: 'right'
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});
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this.imageUrls.push(logoFooterRightUrl);
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}
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const margin = [lrMargin ? lrMargin[0] : 75, 0, lrMargin ? lrMargin[0] : 75, 10];
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return {
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margin: margin,
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columns: columns,
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columnGap: 10
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};
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}
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/**
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* opens a pdf in a new tab
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*
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* @param docDefinition the structure of the PDF document
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*/
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public open(docDefinition: object, metadata?: object): void {
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pdfMake.createPdf(this.getStandardPaper(docDefinition, metadata)).open();
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}
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/**
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* Downloads a pdf with the standard page definitions.
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*
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* @param docDefinition the structure of the PDF document
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* @param filename the name of the file to use
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* @param metadata
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*/
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public download(docDefinition: object, filename: string, metadata?: object): void {
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this.getStandardPaper(docDefinition, metadata).then(doc => {
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this.createPdf(doc, filename);
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});
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}
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/**
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* Downloads a pdf in landscape orientation
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*
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* @param docDefinition the structure of the PDF document
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* @param filename the name of the file to use
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* @param metadata
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*/
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public downloadLandscape(docDefinition: object, filename: string, metadata?: object): void {
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this.getStandardPaper(docDefinition, metadata, null, [50, 80, 50, 75], true).then(doc => {
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this.createPdf(doc, filename);
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});
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}
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/**
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* Downloads a pdf with the ballot papet page definitions.
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*
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* @param docDefinition the structure of the PDF document
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* @param filename the name of the file to use
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* @param logo (optional) url of a logo to be placed as ballot logo
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*/
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public downloadWithBallotPaper(docDefinition: object, filename: string, logo?: string): void {
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this.getBallotPaper(docDefinition, logo).then(doc => {
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this.createPdf(doc, filename);
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});
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}
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/**
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* Triggers the actual page creation and saving.
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*
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* @param doc the finished layout
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* @param filename the filename (without extension) to save as
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*/
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private createPdf(doc: object, filename: string): void {
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pdfMake.createPdf(doc).getBlob(blob => {
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saveAs(blob, `${filename}.pdf`, { autoBOM: true });
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});
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}
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/**
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* Definition of styles for standard papers
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*
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* @returns an object that contains all pdf styles
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*/
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private getStandardPaperStyles(): object {
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return {
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title: {
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fontSize: 18,
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margin: [0, 0, 0, 20],
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bold: true
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},
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subtitle: {
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fontSize: 9,
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margin: [0, -20, 0, 20],
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color: 'grey'
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},
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preamble: {
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margin: [0, 0, 0, 10]
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},
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headerText: {
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fontSize: 10,
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margin: [0, 10, 0, 0]
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},
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footerPageNumber: {
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fontSize: 9,
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margin: [0, 15, 0, 0],
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color: '#555'
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},
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boldText: {
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bold: true
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},
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smallText: {
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fontSize: 8
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},
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heading2: {
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fontSize: 14,
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margin: [0, 0, 0, 10],
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bold: true
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},
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heading3: {
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fontSize: 12,
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margin: [0, 10, 0, 0],
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bold: true
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},
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userDataHeading: {
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fontSize: 14,
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margin: [0, 10],
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bold: true
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},
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userDataTopic: {
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fontSize: 12,
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margin: [0, 5]
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},
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userDataValue: {
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fontSize: 12,
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margin: [15, 5]
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},
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tocEntry: {
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fontSize: 12,
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margin: [0, 0, 0, 0],
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bold: false
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},
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tocCategoryEntry: {
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fontSize: 12,
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margin: [10, 0, 0, 0],
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bold: false
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},
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tocCategoryTitle: {
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fontSize: 12,
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margin: [0, 0, 0, 4],
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bold: true
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},
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tocCategorySection: {
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margin: [0, 0, 0, 10]
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},
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userDataTitle: {
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fontSize: 26,
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margin: [0, 0, 0, 0],
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bold: true
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},
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tableHeader: {
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bold: true,
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fillColor: 'white'
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},
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listParent: {
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fontSize: 14,
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margin: [0, 5]
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},
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listChild: {
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fontSize: 12,
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margin: [0, 5]
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}
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};
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}
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/**
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* Definition of styles for ballot papers
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*
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* @returns an object that contains a limited set of pdf styles
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* used for ballots
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*/
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private getBlankPaperStyles(): object {
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return {
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title: {
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fontSize: 14,
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bold: true,
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margin: [30, 30, 0, 0]
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},
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description: {
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fontSize: 11,
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margin: [30, 0, 0, 0]
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}
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};
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}
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/**
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* Triggers the addition of all images found during creation(including header and footer)
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* to the vfs.
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*/
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private async loadAllImages(): Promise<void> {
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const promises = this.imageUrls.map(image => {
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return this.addImageToVfS(image);
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});
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await Promise.all(promises);
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}
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/**
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* Creates an image in the pdfMake virtual file system, if it doesn't yet exist there
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*
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* @param url
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*/
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private async addImageToVfS(url: string): Promise<void> {
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if (!pdfMake.vfs[url]) {
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const base64 = await this.convertUrlToBase64(url);
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pdfMake.vfs[url] = base64;
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}
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}
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}
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