get.sh

go get github.com/bitly/oauth2_proxy
htpasswd -c -b -s htpasswd bla blabla

oauthproxy.cfg

## OAuth2 Proxy Config File
## https://github.com/bitly/oauth2_proxy

## <addr>:<port> to listen on for HTTP/HTTPS clients
# http_address = "127.0.0.1:4180"
# https_address = ":443"

## TLS Settings
# tls_cert_file = ""
# tls_key_file = ""

## the OAuth Redirect URL.
# defaults to the "https://" + requested host header + "/oauth2/callback"
# redirect_url = "https://internalapp.yourcompany.com/oauth2/callback"

## the http url(s) of the upstream endpoint. If multiple, routing is based on path
upstreams = [
     "https://www.imim.cat"
]

## Log requests to stdout
# request_logging = true

## pass HTTP Basic Auth, X-Forwarded-User and X-Forwarded-Email information to upstream
# pass_basic_auth = true
pass_user_headers = true
## pass the request Host Header to upstream
## when disabled the upstream Host is used as the Host Header
pass_host_header = false 

## Email Domains to allow authentication for (this authorizes any email on this domain)
## for more granular authorization use `authenticated_emails_file`
## To authorize any email addresses use "*"
email_domains = [
     "yourcompany.com"
]

## The OAuth Client ID, Secret
client_id = "123456.apps.googleusercontent.com"
client_secret = "AAA"

## Pass OAuth Access token to upstream via "X-Forwarded-Access-Token"
# pass_access_token = false

## Authenticated Email Addresses File (one email per line)
authenticated_emails_file = "emails.txt"

## Htpasswd File (optional)
## Additionally authenticate against a htpasswd file. Entries must be created with "htpasswd -s" for SHA encryption
## enabling exposes a username/login signin form
htpasswd_file = "htpasswd"

## Templates
## optional directory with custom sign_in.html and error.html
# custom_templates_dir = ""

## skip SSL checking for HTTPS requests
# ssl_insecure_skip_verify = false


## Cookie Settings
## Name     - the cookie name
## Secret   - the seed string for secure cookies; should be 16, 24, or 32 bytes
##            for use with an AES cipher when cookie_refresh or pass_access_token
##            is set
## Domain   - (optional) cookie domain to force cookies to (ie: .yourcompany.com)
## Expire   - (duration) expire timeframe for cookie
## Refresh  - (duration) refresh the cookie when duration has elapsed after cookie was initially set.
##            Should be less than cookie_expire; set to 0 to disable.
##            On refresh, OAuth token is re-validated. 
##            (ie: 1h means tokens are refreshed on request 1hr+ after it was set)
## Secure   - secure cookies are only sent by the browser of a HTTPS connection (recommended)
## HttpOnly - httponly cookies are not readable by javascript (recommended)
cookie_name = "_oauth2_proxy"
cookie_secret = "AAAAAAAAAAAAAAAA"
# cookie_domain = "localhost"
# cookie_expire = "168h"
# cookie_refresh = ""
# cookie_secure = true
cookie_secure = false 
# cookie_httponly = true

start.sh

./oauth2_proxy -config oauth2.cfg