mirror of
https://github.com/scratchfoundation/scratch-www.git
synced 2024-11-27 01:25:52 -05:00
107 lines
3.8 KiB
JavaScript
107 lines
3.8 KiB
JavaScript
var glob = require('glob');
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var path = require('path');
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var FastlyConfigMethods = {
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/*
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* Given the relative path to the static directory, return an array of
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* patterns matching the files and directories there.
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*/
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getStaticPaths: function (rootDir, pathToStatic) {
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var staticPaths = glob.sync(path.resolve(rootDir, pathToStatic));
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return staticPaths.filter(function (pathName) {
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// Exclude view html, resolve everything else in the build
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return path.extname(pathName) !== '.html';
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}).map(function (pathName) {
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// Reduce absolute path to relative paths like '/js'
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var base = path.dirname(path.resolve(rootDir, pathToStatic));
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return pathName.replace(base, '') + (path.extname(pathName) ? '' : '/');
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});
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},
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/*
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* Given a list of express routes, return a list of patterns to match
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* the express route and a static view file associated with the route
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*/
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getViewPaths: function (routes) {
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return routes.reduce(function (paths, route) {
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var path = route.routeAlias || route.pattern;
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if (paths.indexOf(path) === -1) {
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paths.push(path);
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}
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return paths;
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}, []);
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},
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/*
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* Translate an express-style pattern to regex one in two ways:
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*
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* 1. /path/:arg/ – all :arg's become .+?
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* 2. /path/:arg([regex]) – :arg is removed, leaving just /path/([regex])
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*/
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expressPatternToRegex: function (pattern) {
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pattern = pattern.replace(/(:\w+)(\([^\)]+\))/gi, '$2');
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return pattern.replace(/(:\w+)/gi, '.+?');
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},
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/*
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* Given a list of patterns for paths, OR all of them together into one
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* string suitable for a Fastly condition
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*/
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pathsToCondition: function (paths) {
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return 'req.url~"^(' + paths.reduce(function (conditionString, pattern) {
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return conditionString + (conditionString ? '|' : '') + pattern;
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}, '') + ')"';
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},
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/*
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* Helper method to NOT a condition statement
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*/
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negateConditionStatement: function (statement) {
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return '!(' + statement + ')';
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},
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/*
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* Combine static paths, routes, and any additional paths to a single
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* fastly condition to match req.url
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*/
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getAppRouteCondition: function (pathToStatic, routes, additionalPaths, rootDir) {
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var staticPaths = FastlyConfigMethods.getStaticPaths(rootDir, pathToStatic);
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var viewPaths = FastlyConfigMethods.getViewPaths(routes);
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var allPaths = [].concat(staticPaths, viewPaths, additionalPaths);
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return FastlyConfigMethods.pathsToCondition(allPaths);
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},
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getConditionNameForRoute: function (route, type) {
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return 'routes/' + route.pattern + ' (' + type + ')';
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},
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getHeaderNameForRoute: function (route) {
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if (route.name) return 'rewrites/' + route.name;
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if (route.redirect) return 'redirects/' + route.pattern;
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},
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getResponseNameForRoute: function (route) {
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return 'redirects/' + route.pattern;
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},
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/**
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* Returns custom vcl configuration as a string that sets the varnish
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* Time to Live (TTL) for responses that come from s3.
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*
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* @param {string} condition condition under which the response should be set
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*/
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setResponseTTL: function (condition) {
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return '' +
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'if (' + condition + ') {\n' +
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' if (req.url ~ "^/projects/" && !req.http.Cookie:scratchsessionid) {\n' +
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' set beresp.http.Vary = "Accept-Encoding, Accept-Language";\n' +
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' } else {\n' +
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' set beresp.ttl = 0s;\n' +
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' set beresp.grace = 0s;\n' +
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' return(pass);\n' +
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' }\n' +
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'}\n';
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}
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};
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module.exports = FastlyConfigMethods;
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