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utils.ts
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utils.ts
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import invariant from 'tiny-invariant';
import warning from 'tiny-warning';
import type { PDFPageProxy } from 'pdfjs-dist';
import type { PageCallback } from './types';
/**
* Checks if we're running in a browser environment.
*/
export const isBrowser = typeof document !== 'undefined';
/**
* Checks whether we're running from a local file system.
*/
export const isLocalFileSystem = isBrowser && window.location.protocol === 'file:';
/**
* Checks whether a variable is defined.
*
* @param {*} variable Variable to check
*/
export function isDefined<T>(variable: T | undefined): variable is T {
return typeof variable !== 'undefined';
}
/**
* Checks whether a variable is defined and not null.
*
* @param {*} variable Variable to check
*/
export function isProvided<T>(variable: T | null | undefined): variable is T {
return isDefined(variable) && variable !== null;
}
/**
* Checks whether a variable provided is a string.
*
* @param {*} variable Variable to check
*/
export function isString(variable: unknown): variable is string {
return typeof variable === 'string';
}
/**
* Checks whether a variable provided is an ArrayBuffer.
*
* @param {*} variable Variable to check
*/
export function isArrayBuffer(variable: unknown): variable is ArrayBuffer {
return variable instanceof ArrayBuffer;
}
/**
* Checks whether a variable provided is a Blob.
*
* @param {*} variable Variable to check
*/
export function isBlob(variable: unknown): variable is Blob {
invariant(isBrowser, 'isBlob can only be used in a browser environment');
return variable instanceof Blob;
}
/**
* Checks whether a variable provided is a data URI.
*
* @param {*} variable String to check
*/
export function isDataURI(variable: unknown): variable is `data:${string}` {
return isString(variable) && /^data:/.test(variable);
}
export function dataURItoByteString(dataURI: unknown): string {
invariant(isDataURI(dataURI), 'Invalid data URI.');
const [headersString = '', dataString = ''] = dataURI.split(',');
const headers = headersString.split(';');
if (headers.indexOf('base64') !== -1) {
return atob(dataString);
}
return unescape(dataString);
}
export function getDevicePixelRatio() {
return (isBrowser && window.devicePixelRatio) || 1;
}
const allowFileAccessFromFilesTip =
'On Chromium based browsers, you can use --allow-file-access-from-files flag for debugging purposes.';
export function displayCORSWarning() {
warning(
!isLocalFileSystem,
`Loading PDF as base64 strings/URLs may not work on protocols other than HTTP/HTTPS. ${allowFileAccessFromFilesTip}`,
);
}
export function displayWorkerWarning() {
warning(
!isLocalFileSystem,
`Loading PDF.js worker may not work on protocols other than HTTP/HTTPS. ${allowFileAccessFromFilesTip}`,
);
}
export function cancelRunningTask(runningTask?: { cancel?: () => void } | null) {
if (runningTask && runningTask.cancel) runningTask.cancel();
}
export function makePageCallback(page: PDFPageProxy, scale: number): PageCallback {
Object.defineProperty(page, 'width', {
get() {
return this.view[2] * scale;
},
configurable: true,
});
Object.defineProperty(page, 'height', {
get() {
return this.view[3] * scale;
},
configurable: true,
});
Object.defineProperty(page, 'originalWidth', {
get() {
return this.view[2];
},
configurable: true,
});
Object.defineProperty(page, 'originalHeight', {
get() {
return this.view[3];
},
configurable: true,
});
return page as PageCallback;
}
export function isCancelException(error: Error): boolean {
return error.name === 'RenderingCancelledException';
}
export function loadFromFile(file: Blob): Promise<ArrayBuffer> {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = () => {
if (!reader.result) {
return reject(new Error('Error while reading a file.'));
}
resolve(reader.result as ArrayBuffer);
};
reader.onerror = (event) => {
if (!event.target) {
return reject(new Error('Error while reading a file.'));
}
const { error } = event.target;
if (!error) {
return reject(new Error('Error while reading a file.'));
}
switch (error.code) {
case error.NOT_FOUND_ERR:
return reject(new Error('Error while reading a file: File not found.'));
case error.SECURITY_ERR:
return reject(new Error('Error while reading a file: Security error.'));
case error.ABORT_ERR:
return reject(new Error('Error while reading a file: Aborted.'));
default:
return reject(new Error('Error while reading a file.'));
}
};
reader.readAsArrayBuffer(file);
});
}