mirror of
https://github.com/scratchfoundation/scratch-www.git
synced 2024-11-23 15:47:53 -05:00
280 lines
11 KiB
JavaScript
280 lines
11 KiB
JavaScript
var async = require('async');
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var defaults = require('lodash.defaults');
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var glob = require('glob');
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var path = require('path');
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var route_json = require('../src/routes.json');
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const FASTLY_SERVICE_ID = process.env.FASTLY_SERVICE_ID || '';
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const S3_BUCKET_NAME = process.env.S3_BUCKET_NAME || '';
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const PASS_REQUEST_CONDITION_NAME = 'Pass';
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const NOT_PASS_REQUEST_CONDITION_NAME = '!(Pass)';
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const PASS_CACHE_CONDITION_NAME = 'Cache Pass';
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const BUCKET_NAME_HEADER_NAME = 'Bucket name';
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var fastly = require('./lib/fastly-extended')(process.env.FASTLY_API_KEY, FASTLY_SERVICE_ID);
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var extraAppRoutes = [
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// Homepage with querystring.
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// TODO: Should this be added for every route?
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'^/\\?',
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// View html
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'^/[^\/]*\.html$'
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];
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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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var getStaticPaths = function (pathToStatic) {
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var staticPaths = glob.sync(path.resolve(__dirname, 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(__dirname, 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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var getViewPaths = function (routes) {
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return routes.map(function (route) {
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return route.pattern;
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});
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};
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/*
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* Translate an express-style pattern e.g. /path/:arg/ to a regex
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* all :arguments become .+?
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*/
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var expressPatternToRegex = function (pattern) {
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return pattern.replace(/(:[^/]+)\//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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var 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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var 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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var getAppRouteCondition = function (pathToStatic, routes, additionalPaths) {
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var staticPaths = getStaticPaths(pathToStatic);
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var viewPaths = getViewPaths(routes);
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var allPaths = [].concat(staticPaths, viewPaths, additionalPaths);
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return pathsToCondition(allPaths);
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};
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var getConditionNameForRoute = function (route, type) {
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return 'routes/' + route.pattern + ' (' + type + ')';
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};
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var 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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var getResponseNameForRoute = function (route) {
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return 'redirects/' + route.pattern;
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};
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var routes = route_json.map(function (route) {
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return defaults({}, {pattern: expressPatternToRegex(route.pattern)}, route);
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});
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async.auto({
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version: function (cb) {
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fastly.getLatestVersion(function (err, response) {
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if (err) return cb(err);
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// Validate latest version before continuing
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if (response.active || response.locked) {
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fastly.cloneVersion(response.number, function (err, response) {
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if (err) return cb('Failed to clone latest version: ' + err);
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cb(null, response.number);
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});
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} else {
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cb(null, response.number);
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}
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});
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},
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notPassRequestCondition: ['version', function (cb, results) {
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var statement = getAppRouteCondition('../build/*', routes, extraAppRoutes);
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var condition = {
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name: NOT_PASS_REQUEST_CONDITION_NAME,
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statement: statement,
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type: 'REQUEST',
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priority: 10
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};
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fastly.setCondition(results.version, condition, cb);
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}],
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setBucketNameHeader: ['version', 'notPassRequestCondition', function (cb, results) {
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var header = {
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name: BUCKET_NAME_HEADER_NAME,
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action: 'set',
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ignore_if_set: 0,
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type: 'REQUEST',
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dst: 'http.host',
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src: '"' + S3_BUCKET_NAME + '"',
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request_condition: results.notPassRequestCondition.name,
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priority: 1
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};
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fastly.setFastlyHeader(results.version, header, cb);
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}],
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passRequestCondition: ['version', 'notPassRequestCondition', function (cb, results) {
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var condition = {
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name: PASS_REQUEST_CONDITION_NAME,
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statement: negateConditionStatement(results.notPassRequestCondition.statement),
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type: 'REQUEST',
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priority: 10
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};
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fastly.setCondition(results.version, condition, cb);
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}],
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passRequestSettingsCondition: ['version', 'passRequestCondition', function (cb, results) {
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fastly.request(
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'PUT',
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fastly.getFastlyAPIPrefix(FASTLY_SERVICE_ID, results.version) + '/request_settings/Pass',
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{request_condition: results.passRequestCondition.name},
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cb
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);
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}],
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backendCondition: ['version', 'notPassRequestCondition', function (cb, results) {
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fastly.request(
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'PUT',
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fastly.getFastlyAPIPrefix(FASTLY_SERVICE_ID, results.version) + '/backend/s3',
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{request_condition: results.notPassRequestCondition.name},
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cb
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);
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}],
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passCacheCondition: ['version', 'passRequestCondition', function (cb, results) {
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var condition = {
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name: PASS_CACHE_CONDITION_NAME,
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type: 'CACHE',
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statement: results.passRequestCondition.statement,
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priority: results.passRequestCondition.priority
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};
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fastly.setCondition(results.version, condition, cb);
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}],
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passCacheSettingsCondition: ['version', 'passCacheCondition', function (cb, results) {
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fastly.request(
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'PUT',
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fastly.getFastlyAPIPrefix(FASTLY_SERVICE_ID, results.version) + '/cache_settings/Pass',
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{cache_condition: results.passCacheCondition.name},
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cb
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);
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}],
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appRouteRequestConditions: ['version', function (cb, results) {
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var conditions = {};
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async.forEachOf(routes, function (route, id, cb2) {
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var condition = {
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name: getConditionNameForRoute(route, 'request'),
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statement: 'req.url ~ "' + route.pattern + '"',
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type: 'REQUEST',
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// Priority needs to be > 1 to not interact with http->https redirect
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priority: 10 + id
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};
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fastly.setCondition(results.version, condition, function (err, response) {
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if (err) return cb2(err);
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conditions[id] = response;
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cb2(null, response);
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});
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}, function (err) {
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if (err) return cb(err);
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cb(null, conditions);
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});
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}],
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appRouteHeaders: ['version', 'appRouteRequestConditions', function (cb, results) {
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var headers = {};
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async.forEachOf(routes, function (route, id, cb2) {
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if (route.redirect) {
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async.auto({
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responseCondition: function (cb3) {
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var condition = {
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name: getConditionNameForRoute(route, 'response'),
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statement: 'req.url ~ "' + route.pattern + '"',
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type: 'RESPONSE',
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priority: id
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};
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fastly.setCondition(results.version, condition, cb3);
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},
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responseObject: function (cb3) {
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var responseObject = {
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name: getResponseNameForRoute(route),
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status: 301,
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response: 'Moved Permanently',
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request_condition: getConditionNameForRoute(route, 'request')
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};
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fastly.setResponseObject(results.version, responseObject, cb3);
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},
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redirectHeader: ['responseCondition', function (cb3, redirectResults) {
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var header = {
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name: getHeaderNameForRoute(route),
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action: 'set',
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ignore_if_set: 0,
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type: 'RESPONSE',
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dst: 'http.Location',
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src: '"' + route.redirect + '"',
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response_condition: redirectResults.responseCondition.name
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};
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fastly.setFastlyHeader(results.version, header, cb3);
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}]
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}, function (err, redirectResults) {
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if (err) return cb2(err);
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headers[id] = redirectResults.redirectHeader;
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cb2(null, redirectResults);
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});
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} else {
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var header = {
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name: getHeaderNameForRoute(route, 'request'),
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action: 'set',
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ignore_if_set: 0,
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type: 'REQUEST',
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dst: 'url',
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src: '"/' + route.name + '.html"',
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request_condition: results.appRouteRequestConditions[id].name,
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priority: 10
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};
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fastly.setFastlyHeader(results.version, header, function (err, response) {
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if (err) return cb2(err);
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headers[id] = response;
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cb2(null, response);
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});
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}
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}, function (err) {
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if (err) return cb(err);
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cb(null, headers);
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});
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}]},
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function (err, results) {
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if (err) throw new Error(err);
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if (process.env.FASTLY_ACTIVATE_CHANGES) {
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fastly.activateVersion(results.version, function (err, response) {
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if (err) throw new Error(err);
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process.stdout.write('Successfully configured and activated version ' + response.number + '\n');
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fastly.purgeAll(FASTLY_SERVICE_ID, function (err) {
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if (err) throw new Error(err);
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process.stdout.write('Purged all.\n');
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});
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});
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}
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}
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);
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