ngx-extended-pdf-viewer
Version:
Embedding PDF files in your Angular application. Highly configurable viewer including the toolbar, sidebar, and all the features you're used to.
83 lines • 14 kB
JavaScript
export class PdfDocumentPropertiesExtractor {
constructor() {
this.pdfDateStringRegex = new RegExp('^D:' + // Prefix (required)
'(\\d{4})' + // Year (required)
'(\\d{2})?' + // Month (optional)
'(\\d{2})?' + // Day (optional)
'(\\d{2})?' + // Hour (optional)
'(\\d{2})?' + // Minute (optional)
'(\\d{2})?' + // Second (optional)
'([Z|+|-])?' + // Universal time relation (optional)
'(\\d{2})?' + // Offset hour (optional)
// tslint:disable-next-line: quotemark
"'?" + // Splitting apostrophe (optional)
'(\\d{2})?' + // Offset minute (optional)
// tslint:disable-next-line: quotemark
"'?" // Trailing apostrophe (optional)
);
}
async getDocumentProperties() {
const PDFViewerApplication = window.PDFViewerApplication;
const pdfDocument = PDFViewerApplication.pdfDocument;
const result = {};
const md = await pdfDocument.getMetadata();
const info = md.info;
result.author = info.Author;
result.creationDate = this.toDateObject(info.CreationDate);
result.creator = info.Creator;
result.keywords = info.Keywords;
result.linearized = info.IsLinearized;
result.modificationDate = this.toDateObject(info.ModDate);
result.pdfFormatVersion = info.PDFFormatVersion;
result.producer = info.Producer;
result.subject = info.Subject;
result.title = info.Title;
if (md['contentDispositionFilename']) {
result.fileName = md['contentDispositionFilename'];
}
result.maybeFileSize = await (await pdfDocument.getDownloadInfo()).length;
return result;
}
/** shamelessly copied from pdf.js */
toDateObject(input) {
// Optional fields that don't satisfy the requirements from the regular
// expression (such as incorrect digit counts or numbers that are out of
// range) will fall back the defaults from the specification.
const matches = this.pdfDateStringRegex.exec(input);
if (!matches) {
return null;
}
// JavaScript's `Date` object expects the month to be between 0 and 11
// instead of 1 and 12, so we have to correct for that.
const year = parseInt(matches[1], 10);
let month = parseInt(matches[2], 10);
month = month >= 1 && month <= 12 ? month - 1 : 0;
let day = parseInt(matches[3], 10);
day = day >= 1 && day <= 31 ? day : 1;
let hour = parseInt(matches[4], 10);
hour = hour >= 0 && hour <= 23 ? hour : 0;
let minute = parseInt(matches[5], 10);
minute = minute >= 0 && minute <= 59 ? minute : 0;
let second = parseInt(matches[6], 10);
second = second >= 0 && second <= 59 ? second : 0;
const universalTimeRelation = matches[7] || 'Z';
let offsetHour = parseInt(matches[8], 10);
offsetHour = offsetHour >= 0 && offsetHour <= 23 ? offsetHour : 0;
let offsetMinute = parseInt(matches[9], 10) || 0;
offsetMinute = offsetMinute >= 0 && offsetMinute <= 59 ? offsetMinute : 0;
// Universal time relation 'Z' means that the local time is equal to the
// universal time, whereas the relations '+'/'-' indicate that the local
// time is later respectively earlier than the universal time. Every date
// is normalized to universal time.
if (universalTimeRelation === '-') {
hour += offsetHour;
minute += offsetMinute;
}
else if (universalTimeRelation === '+') {
hour -= offsetHour;
minute -= offsetMinute;
}
return new Date(Date.UTC(year, month, day, hour, minute, second));
}
}
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{ IPDFViewerApplication } from './options/pdf-viewer-application';\n\nexport interface PdfDocumentInfo {\n  author?: string;\n  creationDate?: Date;\n  creator?: string;\n\n  keywords?: string;\n  linearized?: boolean;\n  maybeFileSize?: string;\n  modificationDate?: Date;\n  pdfFormatVersion?: string;\n  producer?: string;\n  subject?: string;\n  title?: string;\n}\n\nexport class PdfDocumentPropertiesExtractor {\n  private pdfDateStringRegex = new RegExp(\n    '^D:' + // Prefix (required)\n      '(\\\\d{4})' + // Year (required)\n      '(\\\\d{2})?' + // Month (optional)\n      '(\\\\d{2})?' + // Day (optional)\n      '(\\\\d{2})?' + // Hour (optional)\n      '(\\\\d{2})?' + // Minute (optional)\n      '(\\\\d{2})?' + // Second (optional)\n      '([Z|+|-])?' + // Universal time relation (optional)\n      '(\\\\d{2})?' + // Offset hour (optional)\n      // tslint:disable-next-line: quotemark\n      \"'?\" + // Splitting apostrophe (optional)\n      '(\\\\d{2})?' + // Offset minute (optional)\n      // tslint:disable-next-line: quotemark\n      \"'?\" // Trailing apostrophe (optional)\n  );\n\n  public async getDocumentProperties(): Promise<any> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdfDocument = PDFViewerApplication.pdfDocument;\n\n    const result: any = {};\n    const md = await pdfDocument.getMetadata();\n    const info = md.info as unknown as any;\n\n    result.author = info.Author;\n    result.creationDate = this.toDateObject(info.CreationDate);\n    result.creator = info.Creator;\n    result.keywords = info.Keywords;\n    result.linearized = info.IsLinearized;\n    result.modificationDate = this.toDateObject(info.ModDate);\n    result.pdfFormatVersion = info.PDFFormatVersion;\n    result.producer = info.Producer;\n    result.subject = info.Subject;\n    result.title = info.Title;\n    if (md['contentDispositionFilename']) {\n      result.fileName = md['contentDispositionFilename'];\n    }\n    result.maybeFileSize = await (await pdfDocument.getDownloadInfo()).length;\n    return result;\n  }\n\n  /** shamelessly copied from pdf.js */\n  private toDateObject(input: string | any): Date | null {\n    // Optional fields that don't satisfy the requirements from the regular\n    // expression (such as incorrect digit counts or numbers that are out of\n    // range) will fall back the defaults from the specification.\n    const matches = this.pdfDateStringRegex.exec(input);\n    if (!matches) {\n      return null;\n    }\n\n    // JavaScript's `Date` object expects the month to be between 0 and 11\n    // instead of 1 and 12, so we have to correct for that.\n    const year = parseInt(matches[1], 10);\n    let month = parseInt(matches[2], 10);\n    month = month >= 1 && month <= 12 ? month - 1 : 0;\n    let day = parseInt(matches[3], 10);\n    day = day >= 1 && day <= 31 ? day : 1;\n    let hour = parseInt(matches[4], 10);\n    hour = hour >= 0 && hour <= 23 ? hour : 0;\n    let minute = parseInt(matches[5], 10);\n    minute = minute >= 0 && minute <= 59 ? minute : 0;\n    let second = parseInt(matches[6], 10);\n    second = second >= 0 && second <= 59 ? second : 0;\n    const universalTimeRelation = matches[7] || 'Z';\n    let offsetHour = parseInt(matches[8], 10);\n    offsetHour = offsetHour >= 0 && offsetHour <= 23 ? offsetHour : 0;\n    let offsetMinute = parseInt(matches[9], 10) || 0;\n    offsetMinute = offsetMinute >= 0 && offsetMinute <= 59 ? offsetMinute : 0;\n\n    // Universal time relation 'Z' means that the local time is equal to the\n    // universal time, whereas the relations '+'/'-' indicate that the local\n    // time is later respectively earlier than the universal time. Every date\n    // is normalized to universal time.\n    if (universalTimeRelation === '-') {\n      hour += offsetHour;\n      minute += offsetMinute;\n    } else if (universalTimeRelation === '+') {\n      hour -= offsetHour;\n      minute -= offsetMinute;\n    }\n\n    return new Date(Date.UTC(year, month, day, hour, minute, second));\n  }\n}\n"]}