31 lines
982 B
JavaScript
31 lines
982 B
JavaScript
import assertString from './util/assertString';
|
|
var validMediaType = /^[a-z]+\/[a-z0-9\-\+\._]+$/i;
|
|
var validAttribute = /^[a-z\-]+=[a-z0-9\-]+$/i;
|
|
var validData = /^[a-z0-9!\$&'\(\)\*\+,;=\-\._~:@\/\?%\s]*$/i;
|
|
export default function isDataURI(str) {
|
|
assertString(str);
|
|
var data = str.split(',');
|
|
if (data.length < 2) {
|
|
return false;
|
|
}
|
|
var attributes = data.shift().trim().split(';');
|
|
var schemeAndMediaType = attributes.shift();
|
|
if (schemeAndMediaType.slice(0, 5) !== 'data:') {
|
|
return false;
|
|
}
|
|
var mediaType = schemeAndMediaType.slice(5);
|
|
if (mediaType !== '' && !validMediaType.test(mediaType)) {
|
|
return false;
|
|
}
|
|
for (var i = 0; i < attributes.length; i++) {
|
|
if (!(i === attributes.length - 1 && attributes[i].toLowerCase() === 'base64') && !validAttribute.test(attributes[i])) {
|
|
return false;
|
|
}
|
|
}
|
|
for (var _i = 0; _i < data.length; _i++) {
|
|
if (!validData.test(data[_i])) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
} |