121 lines
3.1 KiB
JavaScript
Executable File
121 lines
3.1 KiB
JavaScript
Executable File
'use strict';
|
|
|
|
var url = require('url');
|
|
|
|
exports = module.exports = function historyApiFallback(options) {
|
|
options = options || {};
|
|
var logger = getLogger(options);
|
|
|
|
return function(req, res, next) {
|
|
var headers = req.headers;
|
|
if (req.method !== 'GET') {
|
|
logger(
|
|
'Not rewriting',
|
|
req.method,
|
|
req.url,
|
|
'because the method is not GET.'
|
|
);
|
|
return next();
|
|
} else if (!headers || typeof headers.accept !== 'string') {
|
|
logger(
|
|
'Not rewriting',
|
|
req.method,
|
|
req.url,
|
|
'because the client did not send an HTTP accept header.'
|
|
);
|
|
return next();
|
|
} else if (headers.accept.indexOf('application/json') === 0) {
|
|
logger(
|
|
'Not rewriting',
|
|
req.method,
|
|
req.url,
|
|
'because the client prefers JSON.'
|
|
);
|
|
return next();
|
|
} else if (!acceptsHtml(headers.accept, options)) {
|
|
logger(
|
|
'Not rewriting',
|
|
req.method,
|
|
req.url,
|
|
'because the client does not accept HTML.'
|
|
);
|
|
return next();
|
|
}
|
|
|
|
var parsedUrl = url.parse(req.url);
|
|
var rewriteTarget;
|
|
options.rewrites = options.rewrites || [];
|
|
for (var i = 0; i < options.rewrites.length; i++) {
|
|
var rewrite = options.rewrites[i];
|
|
var match = parsedUrl.pathname.match(rewrite.from);
|
|
if (match !== null) {
|
|
rewriteTarget = evaluateRewriteRule(parsedUrl, match, rewrite.to, req);
|
|
|
|
if(rewriteTarget.charAt(0) !== '/') {
|
|
logger(
|
|
'We recommend using an absolute path for the rewrite target.',
|
|
'Received a non-absolute rewrite target',
|
|
rewriteTarget,
|
|
'for URL',
|
|
req.url
|
|
);
|
|
}
|
|
|
|
logger('Rewriting', req.method, req.url, 'to', rewriteTarget);
|
|
req.url = rewriteTarget;
|
|
return next();
|
|
}
|
|
}
|
|
|
|
var pathname = parsedUrl.pathname;
|
|
if (pathname.lastIndexOf('.') > pathname.lastIndexOf('/') &&
|
|
options.disableDotRule !== true) {
|
|
logger(
|
|
'Not rewriting',
|
|
req.method,
|
|
req.url,
|
|
'because the path includes a dot (.) character.'
|
|
);
|
|
return next();
|
|
}
|
|
|
|
rewriteTarget = options.index || '/index.html';
|
|
logger('Rewriting', req.method, req.url, 'to', rewriteTarget);
|
|
req.url = rewriteTarget;
|
|
next();
|
|
};
|
|
};
|
|
|
|
function evaluateRewriteRule(parsedUrl, match, rule, req) {
|
|
if (typeof rule === 'string') {
|
|
return rule;
|
|
} else if (typeof rule !== 'function') {
|
|
throw new Error('Rewrite rule can only be of type string or function.');
|
|
}
|
|
|
|
return rule({
|
|
parsedUrl: parsedUrl,
|
|
match: match,
|
|
request: req
|
|
});
|
|
}
|
|
|
|
function acceptsHtml(header, options) {
|
|
options.htmlAcceptHeaders = options.htmlAcceptHeaders || ['text/html', '*/*'];
|
|
for (var i = 0; i < options.htmlAcceptHeaders.length; i++) {
|
|
if (header.indexOf(options.htmlAcceptHeaders[i]) !== -1) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function getLogger(options) {
|
|
if (options && options.logger) {
|
|
return options.logger;
|
|
} else if (options && options.verbose) {
|
|
return console.log.bind(console);
|
|
}
|
|
return function(){};
|
|
}
|