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63 lines
1.2 KiB
TypeScript
63 lines
1.2 KiB
TypeScript
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// Loaded from https://deno.land/x/segno@v1.1.0/lib/validations/isDataURI.ts
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// @ts-ignore allowing typedoc to build
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import { assertString } from '../helpers/assertString.ts';
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/**
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* @ignore
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*/
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const validMediaType = /^[a-z]+\/[a-z0-9\-\+]+$/i;
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/**
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* @ignore
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*/
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const validAttribute = /^[a-z\-]+=[a-z0-9\-]+$/i;
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/**
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* @ignore
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*/
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const validData = /^[a-z0-9!\$&'\(\)\*\+,;=\-\._~:@\/\?%\s]*$/i;
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export const isDataURI = (str: string) => {
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assertString(str);
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let data = str.split(',');
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if (data.length < 2) {
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return false;
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}
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const attributes = (data.shift() as string).trim().split(';');
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const schemeAndMediaType = attributes.shift() as string;
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if (schemeAndMediaType.substr(0, 5) !== 'data:') {
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return false;
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}
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const mediaType = schemeAndMediaType.substr(5);
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if (mediaType !== '' && !validMediaType.test(mediaType)) {
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return false;
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}
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for (let i = 0; i < attributes.length; i++) {
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if (
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i === attributes.length - 1 &&
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attributes[i].toLowerCase() === 'base64'
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) {
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// ok
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} else if (!validAttribute.test(attributes[i])) {
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return false;
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}
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}
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for (let i = 0; i < data.length; i++) {
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if (!validData.test(data[i])) {
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return false;
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}
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}
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return true;
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};
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