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240 lines
5.6 KiB
TypeScript
240 lines
5.6 KiB
TypeScript
// Loaded from https://deno.land/x/oak/negotiation/mediaType.ts
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/*!
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* Adapted directly from negotiator at https://github.com/jshttp/negotiator/
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* which is licensed as follows:
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*
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* (The MIT License)
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*
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* Copyright (c) 2012-2014 Federico Romero
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* Copyright (c) 2012-2014 Isaac Z. Schlueter
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* Copyright (c) 2014-2015 Douglas Christopher Wilson
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* 'Software'), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import { compareSpecs, isQuality, Specificity } from "./common.ts";
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interface MediaTypeSpecificity extends Specificity {
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type: string;
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subtype: string;
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params: { [param: string]: string | undefined };
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}
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const simpleMediaTypeRegExp = /^\s*([^\s\/;]+)\/([^;\s]+)\s*(?:;(.*))?$/;
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function quoteCount(str: string): number {
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let count = 0;
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let index = 0;
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while ((index = str.indexOf(`"`, index)) !== -1) {
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count++;
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index++;
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}
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return count;
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}
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function splitMediaTypes(accept: string): string[] {
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const accepts = accept.split(",");
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let j = 0;
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for (let i = 1; i < accepts.length; i++) {
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if (quoteCount(accepts[j]) % 2 === 0) {
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accepts[++j] = accepts[i];
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} else {
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accepts[j] += `,${accepts[i]}`;
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}
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}
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accepts.length = j + 1;
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return accepts;
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}
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function splitParameters(str: string): string[] {
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const parameters = str.split(";");
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let j = 0;
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for (let i = 1; i < parameters.length; i++) {
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if (quoteCount(parameters[j]) % 2 === 0) {
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parameters[++j] = parameters[i];
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} else {
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parameters[j] += `;${parameters[i]}`;
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}
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}
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parameters.length = j + 1;
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return parameters.map((p) => p.trim());
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}
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function splitKeyValuePair(str: string): [string, string | undefined] {
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const [key, value] = str.split("=");
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return [key.toLowerCase(), value];
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}
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function parseMediaType(
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str: string,
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i: number,
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): MediaTypeSpecificity | undefined {
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const match = simpleMediaTypeRegExp.exec(str);
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if (!match) {
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return;
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}
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const params: { [param: string]: string | undefined } = Object.create(null);
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let q = 1;
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const [, type, subtype, parameters] = match;
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if (parameters) {
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const kvps = splitParameters(parameters).map(splitKeyValuePair);
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for (const [key, val] of kvps) {
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const value = val && val[0] === `"` && val[val.length - 1] === `"`
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? val.substr(1, val.length - 2)
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: val;
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if (key === "q" && value) {
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q = parseFloat(value);
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break;
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}
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params[key] = value;
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}
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}
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return { type, subtype, params, q, i };
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}
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function parseAccept(accept: string): MediaTypeSpecificity[] {
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const accepts = splitMediaTypes(accept);
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const mediaTypes: MediaTypeSpecificity[] = [];
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for (let i = 0; i < accepts.length; i++) {
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const mediaType = parseMediaType(accepts[i].trim(), i);
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if (mediaType) {
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mediaTypes.push(mediaType);
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}
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}
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return mediaTypes;
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}
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function getFullType(spec: MediaTypeSpecificity) {
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return `${spec.type}/${spec.subtype}`;
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}
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function specify(
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type: string,
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spec: MediaTypeSpecificity,
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index: number,
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): Specificity | undefined {
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const p = parseMediaType(type, index);
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if (!p) {
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return;
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}
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let s = 0;
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if (spec.type.toLowerCase() === p.type.toLowerCase()) {
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s |= 4;
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} else if (spec.type !== "*") {
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return;
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}
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if (spec.subtype.toLowerCase() === p.subtype.toLowerCase()) {
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s |= 2;
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} else if (spec.subtype !== "*") {
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return;
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}
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const keys = Object.keys(spec.params);
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if (keys.length) {
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if (
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keys.every((key) =>
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(spec.params[key] || "").toLowerCase() ===
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(p.params[key] || "").toLowerCase()
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)
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) {
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s |= 1;
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} else {
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return;
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}
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}
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return {
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i: index,
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o: spec.o,
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q: spec.q,
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s,
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};
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}
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function getMediaTypePriority(
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type: string,
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accepted: MediaTypeSpecificity[],
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index: number,
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) {
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let priority: Specificity = { o: -1, q: 0, s: 0, i: index };
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for (const accepts of accepted) {
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const spec = specify(type, accepts, index);
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if (
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spec &&
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((priority.s || 0) - (spec.s || 0) ||
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(priority.q || 0) - (spec.q || 0) ||
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(priority.o || 0) - (spec.o || 0)) < 0
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) {
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priority = spec;
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}
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}
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return priority;
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}
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export function preferredMediaTypes(
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accept?: string | null,
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provided?: string[],
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): string[] {
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const accepts = parseAccept(accept === undefined ? "*/*" : accept || "");
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if (!provided) {
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return accepts
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.filter(isQuality)
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.sort(compareSpecs)
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.map(getFullType);
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}
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const priorities = provided.map((type, index) => {
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return getMediaTypePriority(type, accepts, index);
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});
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return priorities
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.filter(isQuality)
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.sort(compareSpecs)
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.map((priority) => provided[priorities.indexOf(priority)]);
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}
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