Headers-impl.js
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"use strict";
const {
isForbidden,
isForbiddenResponse,
isPrivilegedNoCORSRequest,
isNoCORSSafelistedRequest,
isCORSWhitelisted
} = require("./header-types");
const HeaderList = require("./header-list");
function assertName(name) {
if (!name.match(/^[!#$%&'*+\-.^`|~\w]+$/)) {
throw new TypeError("name is invalid");
}
}
function assertValue(value) {
if (value.match(/[\0\r\n]/)) {
throw new TypeError("value is invalid");
}
}
class HeadersImpl {
constructor(globalObject, args) {
this.guard = "none";
this.headersList = new HeaderList();
if (args[0]) {
this._fill(args[0]);
}
}
_fill(init) {
if (Array.isArray(init)) {
for (const header of init) {
if (header.length !== 2) {
throw new TypeError("init is invalid");
}
this.append(header[0], header[1]);
}
} else {
for (const key of Object.keys(init)) {
this.append(key, init[key]);
}
}
}
has(name) {
assertName(name);
return this.headersList.contains(name);
}
get(name) {
assertName(name);
return this.headersList.get(name);
}
_removePrivilegedNoCORSHeaders() {
this.headersList.delete("range");
}
append(name, value) {
value = value.trim();
assertName(name);
assertValue(value);
switch (this.guard) {
case "immutable":
throw new TypeError("Headers is immutable");
case "request":
if (isForbidden(name)) {
return;
}
break;
case "request-no-cors": {
let temporaryValue = this.get(name);
if (temporaryValue === null) {
temporaryValue = value;
} else {
temporaryValue += `, ${value}`;
}
if (!isCORSWhitelisted(name, value)) {
return;
}
break;
}
case "response":
if (isForbiddenResponse(name)) {
return;
}
break;
}
this.headersList.append(name, value);
this._removePrivilegedNoCORSHeaders();
}
set(name, value) {
value = value.trim();
assertName(name);
assertValue(value);
switch (this.guard) {
case "immutable":
throw new TypeError("Headers is immutable");
case "request":
if (isForbidden(name)) {
return;
}
break;
case "request-no-cors": {
if (!isCORSWhitelisted(name, value)) {
return;
}
break;
}
case "response":
if (isForbiddenResponse(name)) {
return;
}
break;
}
this.headersList.set(name, value);
this._removePrivilegedNoCORSHeaders();
}
delete(name) {
assertName(name);
switch (this.guard) {
case "immutable":
throw new TypeError("Headers is immutable");
case "request":
if (isForbidden(name)) {
return;
}
break;
case "request-no-cors": {
if (
!isNoCORSSafelistedRequest(name) &&
!isPrivilegedNoCORSRequest(name)
) {
return;
}
break;
}
case "response":
if (isForbiddenResponse(name)) {
return;
}
break;
}
this.headersList.delete(name);
this._removePrivilegedNoCORSHeaders();
}
* [Symbol.iterator]() {
for (const header of this.headersList.sortAndCombine()) {
yield header;
}
}
}
exports.implementation = HeadersImpl;