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Move string set methods out of fastly-extended

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This also moves all helper methods in `configure-fastly` into a separate utility file, and adds some additional unit tests for those utilities now that they are separated.
This commit is contained in:
Matthew Taylor 2017-04-25 13:18:13 -04:00
parent ca067fdc5e
commit d563535ba5
5 changed files with 258 additions and 192 deletions

139
bin/lib/fastly-config-methods.js Normal file
View file

@ -0,0 +1,139 @@
var glob = require('glob');
var path = require('path');
var FastlyConfigMethods = {
/*
* Given the relative path to the static directory, return an array of
* patterns matching the files and directories there.
*/
getStaticPaths: function (rootDir, pathToStatic) {
var staticPaths = glob.sync(path.resolve(rootDir, pathToStatic));
return staticPaths.filter(function (pathName) {
// Exclude view html, resolve everything else in the build
return path.extname(pathName) !== '.html';
}).map(function (pathName) {
// Reduce absolute path to relative paths like '/js'
var base = path.dirname(path.resolve(rootDir, pathToStatic));
return pathName.replace(base, '') + (path.extname(pathName) ? '' : '/');
});
},
/*
* Given a list of express routes, return a list of patterns to match
* the express route and a static view file associated with the route
*/
getViewPaths: function (routes) {
return routes.reduce(function (paths, route) {
var path = route.routeAlias || route.pattern;
if (paths.indexOf(path) === -1) {
paths.push(path);
}
return paths;
}, []);
},
/*
* Translate an express-style pattern e.g. /path/:arg/ to a regex
* all :arguments become .+?
*/
expressPatternToRegex: function (pattern) {
return pattern.replace(/(:[^/]+)/gi, '.+?');
},
/*
* Given a list of patterns for paths, OR all of them together into one
* string suitable for a Fastly condition
*/
pathsToCondition: function (paths) {
return 'req.url~"^(' + paths.reduce(function (conditionString, pattern) {
return conditionString + (conditionString ? '|' : '') + pattern;
}, '') + ')"';
},
/*
* Helper method to NOT a condition statement
*/
negateConditionStatement: function (statement) {
return '!(' + statement + ')';
},
/*
* Combine static paths, routes, and any additional paths to a single
* fastly condition to match req.url
*/
getAppRouteCondition: function (pathToStatic, routes, additionalPaths, rootDir) {
var staticPaths = FastlyConfigMethods.getStaticPaths(rootDir, pathToStatic);
var viewPaths = FastlyConfigMethods.getViewPaths(routes);
var allPaths = [].concat(staticPaths, viewPaths, additionalPaths);
return FastlyConfigMethods.pathsToCondition(allPaths);
},
getConditionNameForRoute: function (route, type) {
return 'routes/' + route.pattern + ' (' + type + ')';
},
getHeaderNameForRoute: function (route) {
if (route.name) return 'rewrites/' + route.name;
if (route.redirect) return 'redirects/' + route.pattern;
},
getResponseNameForRoute: function (route) {
return 'redirects/' + route.pattern;
},
/**
* Returns custom vcl configuration as a string for setting the backend
* of a request to the given backend/host.
*
* @param {string} backend name of the backend declared in fastly
* @param {string} host name of the s3 bucket to be set as the host
* @param {string} condition condition under which backend should be set
*/
setBackend: function (backend, host, condition) {
return '' +
'if (' + condition + ') {\n' +
' set req.backend = ' + backend + ';\n' +
' set req.http.host = \"' + host + '\";\n' +
'}\n';
},
/**
* Returns custom vcl configuration as a string for headers that
* should be added for the condition in which a request is forwarded.
*
* @param {string} condition condition under which to set pass headers
*/
setForwardHeaders: function (condition) {
return '' +
'if (' + condition + ') {\n' +
' if (!req.http.Fastly-FF) {\n' +
' if (req.http.X-Forwarded-For) {\n' +
' set req.http.Fastly-Temp-XFF = req.http.X-Forwarded-For \", \" client.ip;\n' +
' } else {\n' +
' set req.http.Fastly-Temp-XFF = client.ip;\n' +
' }\n' +
' } else {\n' +
' set req.http.Fastly-Temp-XFF = req.http.X-Forwarded-For;\n' +
' }\n' +
' set req.grace = 60s;\n' +
' return(pass);\n' +
'}\n';
},
/**
* Returns custom vcl configuration as a string that sets the varnish
* Time to Live (TTL) for responses that come from s3.
*
* @param {string} condition condition under which the response should be set
*/
setResponseTTL: function (condition) {
return '' +
'if (' + condition + ') {\n' +
' set beresp.ttl = 0s;\n' +
' set beresp.grace = 0s;\n' +
' return(pass);\n' +
'}\n';
}
};
module.exports = FastlyConfigMethods;

54
bin/lib/fastly-extended.js
View file

@ -201,59 +201,5 @@ module.exports = function (apiKey, serviceId) {
}.bind(this));
};
/**
* Returns custom vcl configuration as a string for setting the backend
* of a request to the given backend/host.
*
* @param {string} backend name of the backend declared in fastly
* @param {string} host name of the s3 bucket to be set as the host
* @param {string} condition condition under which backend should be set
*/
fastly.setBackend = function (backend, host, condition) {
return '' +
'if (' + condition + ') {\n' +
' set req.backend = ' + backend + ';\n' +
' set req.http.host = \"' + host + '\";\n' +
'}\n';
};
/**
* Returns custom vcl configuration as a string for headers that
* should be added for the condition in which a request is forwarded.
*
* @param {string} condition condition under which to set pass headers
*/
fastly.setForwardHeaders = function (condition) {
return '' +
'if (' + condition + ') {\n' +
' if (!req.http.Fastly-FF) {\n' +
' if (req.http.X-Forwarded-For) {\n' +
' set req.http.Fastly-Temp-XFF = req.http.X-Forwarded-For \", \" client.ip;\n' +
' } else {\n' +
' set req.http.Fastly-Temp-XFF = client.ip;\n' +
' }\n' +
' } else {\n' +
' set req.http.Fastly-Temp-XFF = req.http.X-Forwarded-For;\n' +
' }\n' +
' set req.grace = 60s;\n' +
' return(pass);\n' +
'}\n';
};
/**
* Returns custom vcl configuration as a string that sets the varnish
* Time to Live (TTL) for responses that come from s3.
*
* @param {string} condition condition under which the response should be set
*/
fastly.setResponseTTL = function (condition) {
return '' +
'if (' + condition + ') {\n' +
' set beresp.ttl = 0s;\n' +
' set beresp.grace = 0s;\n' +
' return(pass);\n' +
'}\n';
};
return fastly;
};