30144aa3f5
* fix(base64): use js-base64 to handle non ascii text Use js-base64 to handle non ascii text and ignore whitespaces Fix #879 and #409 * fix(base64): use js-base64 to handle non ascii text Use js-base64 to handle non ascii text and ignore whitespaces Fix #879 and #409 * feat(base64 file converter): add a filename and extension fields Add filename and extension (auto filled if data url) to allow downloading with right extension and filename Fix #788 * feat(base64 file converter): add a preview image Fix #594. Taken from #595 (thanks @SAF2k)
64 lines
1.7 KiB
TypeScript
64 lines
1.7 KiB
TypeScript
import { Base64 } from 'js-base64';
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export { textToBase64, base64ToText, isValidBase64, removePotentialDataAndMimePrefix };
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function textToBase64(str: string, { makeUrlSafe = false }: { makeUrlSafe?: boolean } = {}) {
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const encoded = Base64.encode(str);
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return makeUrlSafe ? makeUriSafe(encoded) : encoded;
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}
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function base64ToText(str: string, { makeUrlSafe = false }: { makeUrlSafe?: boolean } = {}) {
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if (!isValidBase64(str, { makeUrlSafe })) {
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throw new Error('Incorrect base64 string');
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}
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let cleanStr = removePotentialDataAndMimePrefix(str);
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if (makeUrlSafe) {
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cleanStr = unURI(cleanStr);
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}
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try {
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return Base64.decode(cleanStr);
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}
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catch (_) {
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throw new Error('Incorrect base64 string');
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}
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}
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function removePotentialDataAndMimePrefix(str: string) {
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return str.replace(/^data:.*?;base64,/, '');
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}
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function isValidBase64(str: string, { makeUrlSafe = false }: { makeUrlSafe?: boolean } = {}) {
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let cleanStr = removePotentialDataAndMimePrefix(str);
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if (makeUrlSafe) {
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cleanStr = unURI(cleanStr);
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}
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try {
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const reEncodedBase64 = Base64.fromUint8Array(Base64.toUint8Array(cleanStr));
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if (makeUrlSafe) {
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return removePotentialPadding(reEncodedBase64) === cleanStr;
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}
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return reEncodedBase64 === cleanStr.replace(/\s/g, '');
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}
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catch (err) {
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return false;
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}
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}
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function makeUriSafe(encoded: string) {
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return encoded.replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_');
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}
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function unURI(encoded: string): string {
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return encoded
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.replace(/-/g, '+')
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.replace(/_/g, '/')
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.replace(/[^A-Za-z0-9+/]/g, '');
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}
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function removePotentialPadding(str: string) {
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return str.replace(/=/g, '');
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}
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