path-rewriter.js
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var _ = require('lodash')
var logger = require('./logger').getInstance()
var ERRORS = require('./errors')
module.exports = {
create: createPathRewriter
}
/**
* Create rewrite function, to cache parsed rewrite rules.
*
* @param {Object} rewriteConfig
* @return {Function} Function to rewrite paths; This function should accept `path` (request.url) as parameter
*/
function createPathRewriter (rewriteConfig) {
var rulesCache
if (!isValidRewriteConfig(rewriteConfig)) {
return
}
if (_.isFunction(rewriteConfig)) {
var customRewriteFn = rewriteConfig
return customRewriteFn
} else {
rulesCache = parsePathRewriteRules(rewriteConfig)
return rewritePath
}
function rewritePath (path) {
var result = path
_.forEach(rulesCache, function (rule) {
if (rule.regex.test(path)) {
result = result.replace(rule.regex, rule.value)
logger.debug('[HPM] Rewriting path from "%s" to "%s"', path, result)
return false
}
})
return result
}
}
function isValidRewriteConfig (rewriteConfig) {
if (_.isFunction(rewriteConfig)) {
return true
} else if (!_.isEmpty(rewriteConfig) && _.isPlainObject(rewriteConfig)) {
return true
} else if (_.isUndefined(rewriteConfig) ||
_.isNull(rewriteConfig) ||
_.isEqual(rewriteConfig, {})) {
return false
} else {
throw new Error(ERRORS.ERR_PATH_REWRITER_CONFIG)
}
}
function parsePathRewriteRules (rewriteConfig) {
var rules = []
if (_.isPlainObject(rewriteConfig)) {
_.forIn(rewriteConfig, function (value, key) {
rules.push({
regex: new RegExp(key),
value: rewriteConfig[key]
})
logger.info('[HPM] Proxy rewrite rule created: "%s" ~> "%s"', key, rewriteConfig[key])
})
}
return rules
}