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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,2 @@ | ||
| export function greeting(str?: string): string { | ||
| if (str) { | ||
| return `Hello ${str}`; | ||
| } else { | ||
| throw new Error("Please provide an input"); | ||
| } | ||
| } | ||
| export { append } from "./src/append.ts"; | ||
| export { vary } from "./src/vary.ts"; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /** | ||
| * RegExp to match field-name in RFC 7230 sec 3.2 | ||
| * | ||
| * field-name = token | ||
| * token = 1*tchar | ||
| * tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" | ||
| * / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" | ||
| * / DIGIT / ALPHA | ||
| * ; any VCHAR, except delimiters | ||
| */ | ||
| const FIELD_NAME_REGEXP = /^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$/; | ||
|
|
||
| /** | ||
| * Append a field to a vary header. | ||
| * | ||
| * @param {String} header | ||
| * @param {String|Array} field | ||
| * | ||
| * @return {String} | ||
| */ | ||
| export const append = (header: string, field: string | string[]): string => { | ||
| // get fields array | ||
| const fields = !Array.isArray(field) ? parse(String(field)) : field; | ||
|
|
||
| // assert on invalid field names | ||
| for (let j = 0; j < fields.length; j++) { | ||
| if (!FIELD_NAME_REGEXP.test(fields[j])) { | ||
| throw new TypeError("field argument contains an invalid header name"); | ||
| } | ||
| } | ||
|
|
||
| // existing, unspecified vary | ||
| if (header === "*") { | ||
| return header; | ||
| } | ||
|
|
||
| // enumerate current values | ||
| let val = header; | ||
| const vals = parse(header.toLowerCase()); | ||
|
|
||
| // unspecified vary | ||
| if (fields.indexOf("*") !== -1 || vals.indexOf("*") !== -1) { | ||
| return "*"; | ||
| } | ||
|
|
||
| for (let i = 0; i < fields.length; i++) { | ||
| const fld = fields[i].toLowerCase(); | ||
|
|
||
| // append value (case-preserving) | ||
| if (vals.indexOf(fld) === -1) { | ||
| vals.push(fld); | ||
| val = val ? val + ", " + fields[i] : fields[i]; | ||
| } | ||
| } | ||
|
|
||
| return val; | ||
| }; | ||
|
|
||
| /** | ||
| * Parse a vary header into an array. | ||
| * | ||
| * @param {String} header | ||
| * | ||
| * @return {Array} | ||
| */ | ||
| const parse = (header: string): string[] => { | ||
| const list = []; | ||
| let end = 0; | ||
| let start = 0; | ||
|
|
||
| // gather tokens | ||
| for (let i = 0, len = header.length; i < len; i++) { | ||
| switch (header.charCodeAt(i)) { | ||
| case 0x20:/* */ | ||
| if (start === end) { | ||
| start = end = i + 1; | ||
| } | ||
| break; | ||
| case 0x2c:/* , */ | ||
| list.push(header.substring(start, end)); | ||
| start = end = i + 1; | ||
| break; | ||
| default: | ||
| end = i + 1; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| // final token | ||
| list.push(header.substring(start, end)); | ||
|
|
||
| return list; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| import { append } from "./append.ts"; | ||
|
|
||
| /** | ||
| * Mark that a request is varied on a header field. | ||
| * | ||
| * @param {function} responseHeadersGet | ||
| * @param {function} responseHeadersSet | ||
| * @param {String|Array} field | ||
| * @public | ||
| */ | ||
| export const vary = ( | ||
| responseHeadersGet: (header: string) => string, | ||
| responseHeadersSet: (header: string, value: string) => void, | ||
| field: string | string[], | ||
| ) => { | ||
| // get existing header | ||
| let val = responseHeadersGet("Vary"); | ||
|
|
||
| const header = Array.isArray(val) ? val.join(", ") : String(val); | ||
|
|
||
| // set new header | ||
| if ((val = append(header, field))) { | ||
| responseHeadersSet("Vary", val); | ||
| } | ||
| }; |
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