oauth2-proxy/oauth2-proxy

package providers

import (
    "context"
    "net/http"
    "net/url"

    "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
    "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests"
)

// stripToken is a helper function to obfuscate "access_token"
// query parameters
func stripToken(endpoint string) string {
    return stripParam("access_token", endpoint)
}

// stripParam generalizes the obfuscation of a particular
// query parameter - typically 'access_token' or 'client_secret'
// The parameter's second half is replaced by '...' and returned
// as part of the encoded query parameters.
// If the target parameter isn't found, the endpoint is returned
// unmodified.
func stripParam(param, endpoint string) string {
    u, err := url.Parse(endpoint)
    if err != nil {
        logger.Errorf("error attempting to strip %s: %s", param, err)
        return endpoint
    }

    if u.RawQuery != "" {
        values, err := url.ParseQuery(u.RawQuery)
        if err != nil {
            logger.Errorf("error attempting to strip %s: %s", param, err)
            return u.String()
        }

        if val := values.Get(param); val != "" {
            values.Set(param, val[:(len(val)/2)]+"...")
            u.RawQuery = values.Encode()
            return u.String()
        }
    }

    return endpoint
}

// validateToken returns true if token is valid
func validateToken(ctx context.Context, p Provider, accessToken string, header http.Header) bool {
    if accessToken == "" || p.Data().ValidateURL == nil || p.Data().ValidateURL.String() == "" {
        return false
    }
    endpoint := p.Data().ValidateURL.String()
    if len(header) == 0 {
        params := url.Values{"access_token": {accessToken}}
        if hasQueryParams(endpoint) {
            endpoint = endpoint + "&" + params.Encode()
        } else {
            endpoint = endpoint + "?" + params.Encode()
        }
    }

    result := requests.New(endpoint).
        WithContext(ctx).
        WithHeaders(header).
        Do()
    if result.Error() != nil {
        logger.Errorf("GET %s", stripToken(endpoint))
        logger.Errorf("token validation request failed: %s", result.Error())
        return false
    }

    logger.Printf("%d GET %s %s", result.StatusCode(), stripToken(endpoint), result.Body())

    if result.StatusCode() == 200 {
        return true
    }
    logger.Errorf("token validation request failed: status %d - %s", result.StatusCode(), result.Body())
    return false
}

// hasQueryParams check if URL has query parameters
func hasQueryParams(endpoint string) bool {
    endpointURL, err := url.Parse(endpoint)
    if err != nil {
        return false
    }

    return len(endpointURL.RawQuery) != 0
}