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utils.js
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utils.js
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/**
* Checks if we're running in a browser environment.
*/
export const isBrowser = typeof window !== 'undefined';
/**
* Checks whether we're running from a local file system.
*/
export const isLocalFileSystem = isBrowser && window.location.protocol === 'file:';
/**
* Checks whether we're running on a production build or not.
*/
export const isProduction = process.env.NODE_ENV === 'production';
/**
* Checks whether a variable is defined.
*
* @param {*} variable Variable to check
*/
export const isDefined = variable => typeof variable !== 'undefined';
/**
* Checks whether a variable is defined and not null.
*
* @param {*} variable Variable to check
*/
export const isProvided = variable => isDefined(variable) && variable !== null;
/**
* Checkes whether a variable provided is a string.
*
* @param {*} variable Variable to check
*/
export const isString = variable => typeof variable === 'string';
/**
* Checks whether a variable provided is an ArrayBuffer.
*
* @param {*} variable Variable to check
*/
export const isArrayBuffer = variable => variable instanceof ArrayBuffer;
/**
* Checkes whether a variable provided is a Blob.
*
* @param {*} variable Variable to check
*/
export const isBlob = (variable) => {
if (!isBrowser) {
throw new Error('Attempted to check if a variable is a Blob on a non-browser environment.');
}
return variable instanceof Blob;
};
/**
* Checkes whether a variable provided is a File.
*
* @param {*} variable Variable to check
*/
export const isFile = (variable) => {
if (!isBrowser) {
throw new Error('Attempted to check if a variable is a File on a non-browser environment.');
}
return variable instanceof File;
};
/**
* Checks whether a string provided is a data URI.
*
* @param {String} str String to check
*/
export const isDataURI = str => isString(str) && /^data:/.test(str);
export const dataURItoUint8Array = (dataURI) => {
if (!isDataURI(dataURI)) {
throw new Error('dataURItoUint8Array was provided with an argument which is not a valid data URI.');
}
let byteString;
if (dataURI.split(',')[0].indexOf('base64') >= 0) {
byteString = atob(dataURI.split(',')[1]);
} else {
byteString = unescape(dataURI.split(',')[1]);
}
const ia = new Uint8Array(byteString.length);
for (let i = 0; i < byteString.length; i += 1) {
ia[i] = byteString.charCodeAt(i);
}
return ia;
};
export const getPixelRatio = () => (isBrowser && window.devicePixelRatio) || 1;
const consoleOnDev = (method, ...message) => {
if (!isProduction) {
// eslint-disable-next-line no-console
console[method](...message);
}
};
export const warnOnDev = (...message) => consoleOnDev('warn', ...message);
export const errorOnDev = (...message) => consoleOnDev('error', ...message);
export const displayCORSWarning = () => {
if (isLocalFileSystem) {
warnOnDev('Loading PDF as base64 strings/URLs might not work on protocols other than HTTP/HTTPS. On Google Chrome, you can use --allow-file-access-from-files flag for debugging purposes.');
}
};
export const cancelRunningTask = (runningTask) => {
if (runningTask && runningTask.cancel) runningTask.cancel();
};
export const makePageCallback = (page, scale) => {
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;
};
export const isCancelException = error => error.name === 'RenderingCancelledException';
export const loadFromFile = file => new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = () => resolve(new Uint8Array(reader.result));
reader.onerror = (event) => {
switch (event.target.error.code) {
case event.target.error.NOT_FOUND_ERR:
return reject(new Error('Error while reading a file: File not found.'));
case event.target.error.NOT_READABLE_ERR:
return reject(new Error('Error while reading a file: File not readable.'));
case event.target.error.SECURITY_ERR:
return reject(new Error('Error while reading a file: Security error.'));
case event.target.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);
return null;
});