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motion ballot pdf creation

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This commit is contained in:
Maximilian Krambach 2019-01-22 15:24:02 +01:00
parent b9f5e6768b
commit 461b29688e
4 changed files with 446 additions and 51 deletions
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191
client/src/app/core/services/pdf-document.service.ts
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@ -9,8 +9,15 @@ import { ConfigService } from './config.service';
import { HttpService } from './http.service';
/**
* TODO: Images and fonts
*
* An interface for the mapping of image placeholder name to the url of the
* image
*/
export interface ImagePlaceHolder {
placeholder: string;
url: string;
}
/**
* Provides the general document structure for PDF documents, such as page margins, header, footer and styles.
* Also provides general purpose open and download functions.
*
@ -43,9 +50,11 @@ export class PdfDocumentService {
/**
* Define the pdfmake virtual file system for fonts
*
* @param images an optional mapping of images urls to be fetched and inserted
* into placeholders
* @returns the vfs-object
*/
private async getVfs(): Promise<object> {
private async initVfs(images?: ImagePlaceHolder[]): Promise<object> {
const fontPathList: string[] = Array.from(
// create a list without redundancies
new Set(
@ -59,45 +68,52 @@ export class PdfDocumentService {
const promises = fontPathList.map(fontPath => {
return this.convertUrlToBase64(fontPath).then(base64 => {
return {
[fontPath.split('/').pop()]: base64.split(',')[1]
[fontPath.split('/').pop()]: base64
};
});
});
const fontDataUrls = await Promise.all(promises);
let imagePromises = [];
if (images && images.length) {
imagePromises = images.map(image => {
return this.convertUrlToBase64(image.url).then(base64 => {
return {
[image.placeholder]: base64
};
});
});
}
const binaryDataUrls = await Promise.all(promises.concat(imagePromises));
let vfs = {};
fontDataUrls.map(entry => {
binaryDataUrls.map(entry => {
vfs = {
...vfs,
...entry
};
});
return vfs;
}
/**
* Converts a given blob to base64
* Retrieves a binary file from the url and returns a base64 value
*
* @param file File as blob
* @returns a promise to the base64 as string
* @param url file url
* @returns a promise with a base64 string
*/
private async convertUrlToBase64(url: string): Promise<string> {
const headers = new HttpHeaders();
const file = await this.httpService.get<ArrayBuffer>(url, {}, {}, headers, 'arraybuffer');
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(new Blob([file]));
reader.onload = () => {
const resultStr: string = reader.result as string;
resolve(resultStr);
};
reader.onerror = error => {
reject(error);
};
}) as Promise<string>;
public async convertUrlToBase64(url: string): Promise<string> {
return new Promise<string>((resolve, reject) => {
const headers = new HttpHeaders();
this.httpService.get<Blob>(url, {}, {}, headers, 'blob').then(file => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => {
const resultStr: string = reader.result as string;
resolve(resultStr.split(',')[1]);
};
reader.onerror = error => {
reject(error);
};
});
});
}
/**
@ -116,21 +132,17 @@ export class PdfDocumentService {
* Overall document definition and styles for the most PDF documents
*
* @param documentContent the content of the pdf as object
* @param metadata
* @param images Array of optional images (url, placeholder) to be inserted
* @returns the pdf document definition ready to export
*/
private async getStandardPaper(documentContent: object, metadata?: object): Promise<object> {
// define the fonts
pdfMake.fonts = {
PdfFont: {
normal: this.getFontName('font_regular'),
bold: this.getFontName('font_bold'),
italics: this.getFontName('font_italic'),
bolditalics: this.getFontName('font_bold_italic')
}
};
pdfMake.vfs = await this.getVfs();
private async getStandardPaper(
documentContent: object,
metadata?: object,
images?: ImagePlaceHolder[]
): Promise<object> {
this.initFonts();
pdfMake.vfs = await this.initVfs(images);
return {
pageSize: 'A4',
pageMargins: [75, 90, 75, 75],
@ -150,6 +162,44 @@ export class PdfDocumentService {
};
}
/**
* Overall document definition and styles for blank PDF documents
* (e.g. ballots)
*
* @param documentContent the content of the pdf as object
* @param image an optional image to insert into the ballot
* @returns the pdf document definition ready to export
*/
private async getBallotPaper(documentContentObject: object, image?: ImagePlaceHolder): Promise<object> {
const images = image ? [image] : null;
this.initFonts();
pdfMake.vfs = await this.initVfs(images);
return {
pageSize: 'A4',
pageMargins: [0, 0, 0, 0],
defaultStyle: {
font: 'PdfFont',
fontSize: 10
},
content: documentContentObject,
styles: this.getBlankPaperStyles()
};
}
/**
* Define fonts
*/
private initFonts(): void {
pdfMake.fonts = {
PdfFont: {
normal: this.getFontName('font_regular'),
bold: this.getFontName('font_bold'),
italics: this.getFontName('font_italic'),
bolditalics: this.getFontName('font_bold_italic')
}
};
}
/**
* Creates the header doc definition for normal PDF documents
*
@ -308,18 +358,41 @@ export class PdfDocumentService {
}
/**
* Downloads a pdf.
* Downloads a pdf with the standard page definitions.
*
* @param docDefinition the structure of the PDF document
* @param filename the name of the file to use
* @param metadata
*/
public async download(docDefinition: object, filename: string, metadata?: object): Promise<void> {
const doc = await this.getStandardPaper(docDefinition, metadata);
await new Promise<void>(resolve => {
const pdf = pdfMake.createPdf(doc);
pdf.getBlob(blob => {
saveAs(blob, `${filename}.pdf`, { autoBOM: true });
resolve();
});
public download(docDefinition: object, filename: string, metadata?: object): void {
this.getStandardPaper(docDefinition, metadata).then(doc => {
this.createPdf(doc, filename);
});
}
/**
* Downloads a pdf with the ballot papet page definitions.
*
* @param docDefinition the structure of the PDF document
* @param filename the name of the file to use
* @param logo (optional) url of a logo to be placed as ballot logo
*/
public downloadWithBallotPaper(docDefinition: object, filename: string, logo?: string): void {
const images: ImagePlaceHolder = logo ? { placeholder: 'ballot-logo', url: logo } : null;
this.getBallotPaper(docDefinition, images).then(doc => {
this.createPdf(doc, filename);
});
}
/**
* Triggers the actual page creation and saving.
*
* @param doc the finished layout
* @param filename the filename (without extension) to save as
*/
private createPdf(doc: object, filename: string): void {
pdfMake.createPdf(doc).getBlob(blob => {
saveAs(blob, `${filename}.pdf`, { autoBOM: true });
});
}
@ -400,4 +473,24 @@ export class PdfDocumentService {
}
};
}
/**
* Definition of styles for ballot papers
*
* @returns an object that contains a limited set of pdf styles
* used for ballots
*/
private getBlankPaperStyles(): object {
return {
title: {
fontSize: 14,
bold: true,
margin: [30, 30, 0, 0]
},
description: {
fontSize: 11,
margin: [30, 0, 0, 0]
}
};
}
}

6
client/src/app/site/motions/components/motion-poll/motion-poll.component.ts
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@ -10,6 +10,7 @@ import { MotionPollService } from '../../services/motion-poll.service';
import { MotionPollDialogComponent } from './motion-poll-dialog.component';
import { MotionRepositoryService } from '../../services/motion-repository.service';
import { PromptService } from 'app/core/services/prompt.service';
import { MotionPollPdfService } from '../../services/motion-poll-pdf.service';
/**
* A component used to display and edit polls of a motion.
@ -89,7 +90,8 @@ export class MotionPollComponent implements OnInit {
private constants: ConstantsService,
private translate: TranslateService,
private promptService: PromptService,
public perms: LocalPermissionsService
public perms: LocalPermissionsService,
private pdfService: MotionPollPdfService
) {
this.pollValues = this.pollService.pollValues;
this.majorityChoice = this.pollService.defaultMajorityMethod;
@ -190,7 +192,7 @@ export class MotionPollComponent implements OnInit {
* TODO: not implemented. Print the buttons
*/
public printBallots(): void {
this.pollService.printBallots();
this.pdfService.printBallots(this.poll);
}
/**

17
client/src/app/site/motions/services/motion-poll-pdf.service.spec.ts Normal file
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@ -0,0 +1,17 @@
import { TestBed } from '@angular/core/testing';
import { MotionPollPdfService } from './motion-poll-pdf.service';
import { E2EImportsModule } from 'e2e-imports.module';
describe('MotionPdfService', () => {
beforeEach(() =>
TestBed.configureTestingModule({
imports: [E2EImportsModule]
})
);
it('should be created', () => {
const service: MotionPollPdfService = TestBed.get(MotionPollPdfService);
expect(service).toBeTruthy();
});
});

283
client/src/app/site/motions/services/motion-poll-pdf.service.ts Normal file
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@ -0,0 +1,283 @@
import { Injectable } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
import { ConfigService } from 'app/core/services/config.service';
import { MotionPoll } from 'app/shared/models/motions/motion-poll';
import { MotionRepositoryService } from './motion-repository.service';
import { PdfDocumentService } from 'app/core/services/pdf-document.service';
import { UserRepositoryService } from 'app/site/users/services/user-repository.service';
/**
* Creates a pdf for a motion poll. Takes as input any motionPoll
* Provides the public method `printBallots(motionPoll)` which should be convenient to use.
*
* @example
* ```ts
* this.MotionPollPdfService.printBallos(this.poll);
* ```
*/
@Injectable({
providedIn: 'root'
})
export class MotionPollPdfService {
/**
* The method to determine the number of ballots to print. Value is
* decided in configuration service as `motions_pdf_ballot_papers_selection`.
* Options are:
*
* - NUMBER_OF_DELEGATES Amount of users belonging to the predefined 'delegates' group (group id 2)
* - NUMBER_OF_ALL_PARTICIPANTS The amount of all registered users
* - CUSTOM_NUMBER a given number of ballots (see {@link ballotCustomCount})
*/
private ballotCountSelection: 'NUMBER_OF_DELEGATES' | 'NUMBER_OF_ALL_PARTICIPANTS' | 'CUSTOM_NUMBER';
/**
* An arbitrary number of ballots to print, if {@link ballotCountSection} is set
* to CUSTOM_NUMBER. Value is fetched from the configuration value `motions_pdf_ballot_papers_number`
*/
private ballotCustomCount: number;
/**
* The event name (as set in config `general_event_name`)
*/
private eventName: string;
/**
* The url of the logo to be printed (as set in config `logo_pdf_ballot_paper`)
*/
private logo: string;
/**
* Constructor. Subscribes to configuration values
*
* @param translate handle translations
* @param motionRepo get parent motions
* @param configService Read config variables
* @param userRepo User repository for counting amount of ballots needed
* @param pdfService the pdf document creation service
*/
public constructor(
private translate: TranslateService,
private motionRepo: MotionRepositoryService,
private configService: ConfigService,
private userRepo: UserRepositoryService,
private pdfService: PdfDocumentService
) {
this.configService.get('motions_pdf_ballot_papers_number').subscribe(count => (this.ballotCustomCount = count));
this.configService
.get('motions_pdf_ballot_papers_selection')
.subscribe(selection => (this.ballotCountSelection = selection));
this.configService.get('general_event_name').subscribe(name => (this.eventName = name));
this.configService.get('logo_pdf_ballot_paper').subscribe(url => {
if (url && url.path) {
this.logo = url.path;
}
});
}
/**
* Triggers a pdf creation for this poll's ballots.
* There will be 8 ballots per page.
* Each ballot will contain:
* - the event name and logo
* - a first, bold line with a title. Defaults to the label Motion, the identifier,
* and the current number of polls for this motion (if more than one)
* - a subtitle. A second, short (two lines, 90 characters) clarification for
* the ballot. Defaults to the beginning of the motion's title
* - the options 'yes', 'no', 'abstain' translated to the client's language.
*
* @param motionPoll: The poll this ballot refers to
* @param title (optional) a different title
* @param subtitle (optional) a different subtitle
*/
public printBallots(motionPoll: MotionPoll, title?: string, subtitle?: string): void {
const motion = this.motionRepo.getViewModel(motionPoll.motion_id);
const fileName = `${this.translate.instant('Motion')} - ${motion.identifier} - ${this.translate.instant(
'ballot-paper'
)}`;
if (!title) {
title = `${this.translate.instant('Motion')} - ${motion.identifier}`;
if (motion.motion.polls.length > 1) {
title += ` (${this.translate.instant('Vote')} ${motion.motion.polls.length})`;
}
}
if (!subtitle) {
subtitle = motion.title;
}
if (subtitle.length > 90) {
subtitle = subtitle.substring(0, 90) + '...';
}
this.pdfService.downloadWithBallotPaper(this.getContent(title, subtitle), fileName, this.logo);
}
/**
* @returns the amount of ballots that are to be printed, depending n the
* config settings
*/
private getBallotCount(): number {
switch (this.ballotCountSelection) {
case 'NUMBER_OF_ALL_PARTICIPANTS':
return this.userRepo.getViewModelList().length;
case 'NUMBER_OF_DELEGATES':
return this.userRepo.getViewModelList().filter(user => user.groups_id && user.groups_id.includes(2))
.length;
case 'CUSTOM_NUMBER':
return this.ballotCustomCount;
}
}
/**
* Creates an entry for an option (a label with a circle)
*
* @returns pdfMake definitions
*/
private createBallotOption(decision: string): object {
const BallotCircleDimensions = { yDistance: 6, size: 8 };
return {
margin: [40 + BallotCircleDimensions.size, 10, 0, 0],
columns: [
{
width: 15,
canvas: this.drawCircle(BallotCircleDimensions.yDistance, BallotCircleDimensions.size)
},
{
width: 'auto',
text: decision
}
]
};
}
/**
* Create a createPdf definition for the correct amount of ballots
* with 8 ballots per page
*
* @param title: first, bold line for the ballot.
* @param subtitle: second line for the ballot.
* @returns an array of content objects defining pdfMake instructions
*/
private getContent(title: string, subtitle: string): Array<object> {
const content = [];
const amount = this.getBallotCount();
const fullpages = Math.floor(amount / 8);
let partialpageEntries = amount % 8;
for (let i = 0; i < fullpages; i++) {
content.push({
table: {
headerRows: 1,
widths: ['*', '*'],
body: [
[this.createBallot(title, subtitle), this.createBallot(title, subtitle)],
[this.createBallot(title, subtitle), this.createBallot(title, subtitle)],
[this.createBallot(title, subtitle), this.createBallot(title, subtitle)],
[this.createBallot(title, subtitle), this.createBallot(title, subtitle)]
],
pageBreak: 'after'
},
// layout: '{{ballot-placeholder-to-insert-functions-here}}',
rowsperpage: 4
});
}
if (partialpageEntries) {
const partialPageBody = [];
while (partialpageEntries > 1) {
partialPageBody.push([this.createBallot(title, subtitle), this.createBallot(title, subtitle)]);
partialpageEntries -= 2;
}
if (partialpageEntries === 1) {
partialPageBody.push([this.createBallot(title, subtitle), '']);
}
content.push({
table: {
headerRows: 1,
widths: ['50%', '50%'],
body: partialPageBody
},
// layout: '{{ballot-placeholder-to-insert-functions-here}}',
rowsperpage: 4
});
}
return content;
}
/**
* get a pdfMake header definition with the event name and an optional logo
*
* @returns pdfMake definitions
*/
private getHeader(): object {
const columns: object[] = [];
columns.push({
text: this.eventName,
fontSize: 8,
alignment: 'left',
width: '60%'
});
if (this.logo) {
columns.push({
image: 'ballot-logo', // fixed dummy name not used outside ballot creation
fit: [90, 25],
alignment: 'right',
width: '40%'
});
}
return {
color: '#555',
fontSize: 10,
margin: [30, 10, 10, -10], // [left, top, right, bottom]
columns: columns,
columnGap: 5
};
}
/**
* Creates one ballot in it's position on the page. Note that creating once
* and then pasting the result several times does not work
*
* @param title The identifier of the motion
* @param subtitle The actual motion title
*/
private createBallot(title: string, subtitle: string): any {
const sheetend = 40;
return {
stack: [
this.getHeader(),
{
text: title,
style: 'title'
},
{
text: subtitle,
style: 'description'
},
this.createBallotOption(this.translate.instant('Yes')),
this.createBallotOption(this.translate.instant('No')),
this.createBallotOption(this.translate.instant('Abstain'))
],
margin: [0, 0, 0, sheetend]
};
}
/**
* Helper to draw a circle on its position on the ballot paper
*
* @param y vertical offset
* @param size the size of the circle
* @returns an array containing one circle definition for pdfMake
*/
private drawCircle(y: number, size: number): Array<object> {
return [
{
type: 'ellipse',
x: 0,
y: y,
lineColor: 'black',
r1: size,
r2: size
}
];
}
}