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