Allow self-signed certificates for testing purposes #176

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When testing on my local machine passport-oauth2 against a self-signed server, I always received the following error:

Error: DEPTH_ZERO_SELF_SIGNED_CERT at OAuth2Strategy._createOAuthError (/home/ubuntu/reviewer/brivolabs-sam-cork/oauth-demo/node_modules/passport-oauth/node_modules/passport-oauth2/lib/strategy.js:340:17) 
at /home/ubuntu/reviewer/brivolabs-sam-cork/oauth-demo/node_modules/passport-oauth/node_modules/passport-oauth2/lib/strategy.js:173:43 
at /home/ubuntu/reviewer/brivolabs-sam-cork/oauth-demo/node_modules/passport-oauth/node_modules/passport-oauth2/node_modules/oauth/lib/oauth2.js:162:18 
at ClientRequest.<anonymous> (/home/ubuntu/reviewer/brivolabs-sam-cork/oauth-demo/node_modules/passport-oauth/node_modules/passport-oauth2/node_modules/oauth/lib/oauth2.js:133:5) 
at ClientRequest.EventEmitter.emit (events.js:95:17) 
at CleartextStream.socketErrorListener (http.js:1547:9) 
at CleartextStream.EventEmitter.emit (events.js:95:17) 
at SecurePair.<anonymous> (tls.js:1389:19) 
at SecurePair.EventEmitter.emit (events.js:92:17) 
at SecurePair.maybeInitFinished (tls.js:982:10)

This fix allows us to use a self-signed certificate if the env variable ALLOW_UNAUTHORIZED_CERTS is set.
I know that there is a env that some nodejs people use to avoid the issue (which is NODE_TLS_REJECT_UNAUTHORIZED set to "0"), but I thought it might be better to have it explicit on oauth.

My solution is to extend the existing class and save the passed into the constructor. Then, verify the self-signed server certificate with the provided cabundle.

OAuth2 = require('oauth').OAuth2

class OAuth2CA extends OAuth2
    constructor: (options) ->
        super(options.clientID,  options.clientSecret, options.baseSite, options.authorizationURL, options.tokenURL, options.customHeaders)
        @options = options

    _executeRequest: (http_library, options, post_body, callback) -> =
        super(http_library, options, post_body, callback)

The cabundle is created with the following loop for all pem files under /etc/ssl/certs.

fs = require 'fs'

dir = '/etc/ssl/certs'
files = fs.readdirSync(dir).filter (file) -> /.*\.pem/i.test(file)
files = (file) -> "#{dir}/#{file}"
ca = (file) -> fs.readFileSync file

For your information.

I will look into it, but for the developer certificate that we have we do not have a certificate authority :)
It was created on a different server and then distributed to us

For my case on Debian linux, put the ca certificate "ca.crt" into "/usr/local/share/ca-certificates" and run "update-ca-certificates" to put it into the "/etc/ssl/certs". The above-mentioned code "ca = ..." would loop for the directory to create the ca bundle for Oauth2CA to verify the oauth request. For your information.

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