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// Utility to parse the value of
// https://w3c.github.io/webappsec-subresource-integrity/#the-integrity-attribute
const {
ArrayPrototype,
ObjectDefineProperty,
ObjectFreeze,
ObjectSeal,
ObjectSetPrototypeOf,
RegExp,
RegExpPrototypeExec,
StringPrototypeSlice,
} = primordials;
const {
ERR_SRI_PARSE
} = require('internal/errors').codes;
const kWSP = '[\\x20\\x09]';
const kVCHAR = '[\\x21-\\x7E]';
const kHASH_ALGO = 'sha(?:256|384|512)';
// Base64
const kHASH_VALUE = '[A-Za-z0-9+/]+[=]{0,2}';
const kHASH_EXPRESSION = `(${kHASH_ALGO})-(${kHASH_VALUE})`;
// Ungrouped since unused
const kOPTION_EXPRESSION = `(?:${kVCHAR}*)`;
const kHASH_WITH_OPTIONS = `${kHASH_EXPRESSION}(?:[?](${kOPTION_EXPRESSION}))?`;
const kSRIPattern = RegExp(`(${kWSP}*)(?:${kHASH_WITH_OPTIONS})`, 'g');
ObjectSeal(kSRIPattern);
const kAllWSP = RegExp(`^${kWSP}*$`);
ObjectSeal(kAllWSP);
const BufferFrom = require('buffer').Buffer.from;
// Returns {algorithm, value (in base64 string), options,}[]
const parse = (str) => {
let prevIndex = 0;
let match;
const entries = [];
while ((match = RegExpPrototypeExec(kSRIPattern, str)) !== null) {
if (match.index !== prevIndex) {
throw new ERR_SRI_PARSE(str, str[prevIndex], prevIndex);
}
if (entries.length > 0 && match[1] === '') {
throw new ERR_SRI_PARSE(str, str[prevIndex], prevIndex);
}
// Avoid setters being fired
ObjectDefineProperty(entries, entries.length, {
__proto__: null,
enumerable: true,
configurable: true,
value: ObjectFreeze({
__proto__: null,
algorithm: match[2],
value: BufferFrom(match[3], 'base64'),
options: match[4] === undefined ? null : match[4],
})
});
prevIndex += match[0].length;
}
if (prevIndex !== str.length) {
if (RegExpPrototypeExec(kAllWSP, StringPrototypeSlice(str, prevIndex)) === null) {
throw new ERR_SRI_PARSE(str, str[prevIndex], prevIndex);
}
}
return ObjectSetPrototypeOf(entries, ArrayPrototype);
};
module.exports = {
parse,
};
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