Isolating some PICS custom changes (#57)

## Description

Isolating PICS custom changes

## Motivation and Context

It's hard to understand what are our custom changes and what is from
OAuth2-Proxy main repo

## How Has This Been Tested?

Created a local container image of the oauth-proxy from this PR and
integrated it with Reporting locally.
- run in the root of this repo
  - docker buildx build -t oauth-local .
- Updated FROM statement in pics/src/services/Oauth2Proxy/Dockerfile to 
  - FROM oauth-local

The following flows were checked:
- Login
- Audit logs
- Logout 


## Checklist:

- [x] Isolating some dunction in separated files
- [x] Creating a folder for Pics packages

oauthproxy.go

@@ -25,11 +25,11 @@ import (
 	sessionsapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/app/pagewriter"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/app/redirect"
-	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/audit"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/authentication/basic"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/cookies"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/encryption"
 	proxyhttp "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/http"
+	picsaudit "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/pics/audit"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/util"
 
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/ip"
@@ -114,7 +114,8 @@ type OAuthProxy struct {
 	appDirector       redirect.AppDirector
 
 	encodeState bool
-	AuditClient *audit.Client
+
+	picsAuditClient *picsaudit.Client
 }
 
 // NewOAuthProxy creates a new instance of OAuthProxy from the options provided
@@ -213,7 +214,7 @@ func NewOAuthProxy(opts *options.Options, validator func(string) bool) (*OAuthPr
 		Validator:   redirectValidator,
 	})
 
-	auditClient, err := audit.NewAuditClient(&audit.ClientOpts{
+	picsAuditClient, err := picsaudit.NewAuditClient(&picsaudit.ClientOpts{
 		URL:         opts.AuditURL,
 		Enabled:     opts.EnableAudit,
 		ProductName: opts.AuditProductName,
@@ -256,7 +257,7 @@ func NewOAuthProxy(opts *options.Options, validator func(string) bool) (*OAuthPr
 		redirectValidator:  redirectValidator,
 		appDirector:        appDirector,
 		encodeState:        opts.EncodeState,
-		AuditClient:        auditClient,
+		picsAuditClient:    picsAuditClient,
 	}
 	p.buildServeMux(opts.ProxyPrefix)
 
@@ -434,7 +435,7 @@ func buildSessionChain(opts *options.Options, provider providers.Provider, sessi
 		if oidcProviderSettings.CookieRefreshURL == "" {
 			oidcProviderSettings.CookieRefreshURL = fmt.Sprintf("%s/session/refresh", oidcProviderSettings.IssuerURL)
 		}
-		chain = chain.Append(middleware.NewCookieRefresh(&middleware.CookieRefreshOptions{CookieRefreshURL: oidcProviderSettings.CookieRefreshURL, CookieRefreshName: oidcProviderSettings.CookieRefreshName}))
+		chain = chain.Append(middleware.PicsNewCookieRefresh(&middleware.CookieRefreshOptions{CookieRefreshURL: oidcProviderSettings.CookieRefreshURL, CookieRefreshName: oidcProviderSettings.CookieRefreshName}))
 		logger.Printf("Enabling OIDC cookie refresh functionality for the cookie '%s' using the url '%s' because OIDCEnableCookieRefresh is enabled", oidcProviderSettings.CookieRefreshURL, oidcProviderSettings.CookieRefreshName)
 	}
 
@@ -925,7 +926,7 @@ func (p *OAuthProxy) OAuthCallback(rw http.ResponseWriter, req *http.Request) {
 	if !csrf.CheckOAuthState(nonce) {
 		errorMsg := "Invalid authentication via OAuth2: CSRF token mismatch, potential attack"
 		logger.PrintAuthf(session.Email, req, logger.AuthFailure, errorMsg)
-		p.AuditClient.CreateFailedLoginAuditEntry(session, appRedirect, req.Header.Get("edisp-org-id"), errorMsg)
+		p.picsAuditClient.CreateFailedLoginAuditEntry(session, appRedirect, req.Header.Get("edisp-org-id"), errorMsg)
 		p.ErrorPage(rw, req, http.StatusForbidden, "CSRF token mismatch, potential attack", "Login Failed: Unable to find a valid CSRF token. Please try again.")
 		return
 	}
@@ -954,7 +955,7 @@ func (p *OAuthProxy) OAuthCallback(rw http.ResponseWriter, req *http.Request) {
 			p.ErrorPage(rw, req, http.StatusInternalServerError, err.Error())
 			return
 		}
-		p.AuditClient.CreateSuccessfulLoginAuditEntry(session, appRedirect, req.Header.Get("edisp-org-id"))
+		p.picsAuditClient.CreateSuccessfulLoginAuditEntry(session, appRedirect, req.Header.Get("edisp-org-id"))
 		http.Redirect(rw, req, appRedirect, http.StatusFound)
 	} else {
 		logger.PrintAuthf(session.Email, req, logger.AuthFailure, "Invalid authentication via OAuth2: unauthorized")

pkg/apis/options/legacy_options.go

@@ -247,7 +247,7 @@ func (l *LegacyHeaders) getRequestHeaders() []Header {
 	}
 
 	if l.PassAuthorization {
-		requestHeaders = append(requestHeaders, getAuthorizationHeader()...)
+		requestHeaders = append(requestHeaders, PicsGetAuthorizationHeader()...)
 	}
 
 	for i := range requestHeaders {
@@ -272,11 +272,11 @@ func (l *LegacyHeaders) getResponseHeaders() []Header {
 	}
 
 	if l.SetAuthorization {
-		responseHeaders = append(responseHeaders, getAuthorizationHeader()...)
+		responseHeaders = append(responseHeaders, PicsGetAuthorizationHeader()...)
 	}
 
 	if l.SetIntrospectionValue {
-		responseHeaders = append(responseHeaders, getXAuthIntrospectionValueHeaders())
+		responseHeaders = append(responseHeaders, PicsGetXAuthIntrospectionValueHeaders())
 	}
 	return responseHeaders
 }
@@ -369,32 +369,20 @@ func getPassAccessTokenHeader() Header {
 	}
 }
 
-func getAuthorizationHeader() []Header {
-	headers := []Header{
-		{
-			Name: "Authorization",
-			Values: []HeaderValue{
-				{
-					ClaimSource: &ClaimSource{
-						Claim:  "id_token",
-						Prefix: "Bearer ",
-					},
-				},
-			},
-		},
-		{
-			Name: "x-auth-request-id-token",
-			Values: []HeaderValue{
-				{
-					ClaimSource: &ClaimSource{
-						Claim: "id_token",
-					},
-				},
-			},
-		},
-	}
-	return headers
-}
+// PICS: changed to PicsGetAuthorizationHeader, this one is not used anywhere
+// func getAuthorizationHeader() Header {
+// 	return Header{
+// 		Name: "Authorization",
+// 		Values: []HeaderValue{
+// 			{
+// 				ClaimSource: &ClaimSource{
+// 					Claim:  "id_token",
+// 					Prefix: "Bearer ",
+// 				},
+// 			},
+// 		},
+// 	}
+// }
 
 func getPreferredUsernameHeader() Header {
 	return Header{
@@ -469,19 +457,6 @@ func getXAuthRequestAccessTokenHeader() Header {
 	}
 }
 
-func getXAuthIntrospectionValueHeaders() Header {
-	return Header{
-		Name: "X-Auth-Introspect-Value",
-		Values: []HeaderValue{
-			{
-				ClaimSource: &ClaimSource{
-					Claim: "introspect-claims",
-				},
-			},
-		},
-	}
-}
-
 type LegacyServer struct {
 	MetricsAddress       string   `flag:"metrics-address" cfg:"metrics_address"`
 	MetricsSecureAddress string   `flag:"metrics-secure-address" cfg:"metrics_secure_address"`

pkg/apis/options/pics_legacy_options.go

@@ -0,0 +1,41 @@
+package options
+
+func PicsGetAuthorizationHeader() []Header {
+	headers := []Header{
+		{
+			Name: "Authorization",
+			Values: []HeaderValue{
+				{
+					ClaimSource: &ClaimSource{
+						Claim:  "id_token",
+						Prefix: "Bearer ",
+					},
+				},
+			},
+		},
+		{
+			Name: "x-auth-request-id-token",
+			Values: []HeaderValue{
+				{
+					ClaimSource: &ClaimSource{
+						Claim: "id_token",
+					},
+				},
+			},
+		},
+	}
+	return headers
+}
+
+func PicsGetXAuthIntrospectionValueHeaders() Header {
+	return Header{
+		Name: "X-Auth-Introspect-Value",
+		Values: []HeaderValue{
+			{
+				ClaimSource: &ClaimSource{
+					Claim: "introspect-claims",
+				},
+			},
+		},
+	}
+}

pkg/middleware/pics_cookie_refresh.go

@@ -15,7 +15,7 @@ type CookieRefreshOptions struct {
 	CookieRefreshURL  string
 }
 
-func NewCookieRefresh(opts *CookieRefreshOptions) alice.Constructor {
+func PicsNewCookieRefresh(opts *CookieRefreshOptions) alice.Constructor {
 	cr := &cookieRefresh{
 		HTTPClient:        &http.Client{},
 		CookieRefreshName: opts.CookieRefreshName,

pkg/pics/audit/audit_client.go

@@ -33,7 +33,7 @@ type Client struct {
 func NewAuditClient(opts *ClientOpts) (*Client, error) {
 	if opts.Enabled {
 		log.Print("Audit entries will be created since OAUTH2_PROXY_ENABLE_AUDIT is true")
-		err := opts.Validate()
+		err := opts.validate()
 		if err != nil {
 			return nil, err
 		}
@@ -154,7 +154,7 @@ func (c *Client) send(msg string) error {
 	return nil
 }
 
-func (c *ClientOpts) Validate() error {
+func (c *ClientOpts) validate() error {
 	err := errors.New("")
 	if strings.TrimSpace(c.URL) == "" {
 		err = errors.New("the OAUTH2_PROXY_AUDIT_URL must be set")

pkg/pics/audit/audit_event.go

@@ -81,6 +81,7 @@ type ExtensionContent struct {
 	URL         string `json:"url,omitempty"`
 	ValueString string `json:"valueString,omitempty"`
 }
+
 type Extension struct {
 	URL       string              `json:"url,omitempty"`
 	Extension []*ExtensionContent `json:"extension,omitempty"`

providers/oidc.go

@@ -1,19 +1,15 @@
 package providers
 
 import (
-	"bytes"
 	"context"
-	b64 "encoding/base64"
 	"errors"
 	"fmt"
-	"net/http"
 	"net/url"
 	"time"
 
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
-	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests"
 	"golang.org/x/oauth2"
 )
 
@@ -98,7 +94,8 @@ func (p *OIDCProvider) Redeem(ctx context.Context, redirectURL, code, codeVerifi
 // EnrichSession is called after Redeem to allow providers to enrich session fields
 // such as User, Email, Groups with provider specific API calls.
 func (p *OIDCProvider) EnrichSession(ctx context.Context, s *sessions.SessionState) error {
-	err := p.enrichFromIntrospectURL(ctx, s)
+
+	err := p.PicsEnrichFromIntrospectURL(ctx, s)
 	if err != nil {
 		logger.Errorf("Warning: Introspect URL request failed: %v", err)
 	}
@@ -130,40 +127,6 @@ func (p *OIDCProvider) ValidateSession(ctx context.Context, s *sessions.SessionS
 	return true
 }
 
-// enrichFromIntrospectURL enriches a session's claims and permissions via the JSON response of
-// an OIDC Introspection URL
-func (p *OIDCProvider) enrichFromIntrospectURL(ctx context.Context, s *sessions.SessionState) error {
-	clientSecret, err := p.GetClientSecret()
-	if err != nil {
-		return err
-	}
-	params := url.Values{}
-	params.Add("token", s.AccessToken)
-	basicAuth := b64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", p.ClientID, clientSecret)))
-	if p.IntrospectURL == nil {
-		p.IntrospectURL = &url.URL{
-			Scheme: p.RedeemURL.Scheme,
-			Host:   p.RedeemURL.Host,
-			Path:   "/authorize/oauth2/v4/introspect",
-		}
-	}
-	logger.Printf("Requesting introspect from '%s'", p.IntrospectURL)
-
-	result := requests.New(p.IntrospectURL.String()).
-		WithContext(ctx).
-		WithMethod("POST").
-		WithBody(bytes.NewBufferString(params.Encode())).
-		SetHeader("Authorization", fmt.Sprintf("Basic %s", basicAuth)).
-		SetHeader("Content-Type", "application/x-www-form-urlencoded").
-		Do()
-
-	if result.StatusCode() != http.StatusOK {
-		return fmt.Errorf("error while requesting introspect claims, status code - %d", result.StatusCode())
-	}
-	s.IntrospectClaims = b64.StdEncoding.EncodeToString(result.Body())
-	return nil
-}
-
 // RefreshSession uses the RefreshToken to fetch new Access and ID Tokens
 func (p *OIDCProvider) RefreshSession(ctx context.Context, s *sessions.SessionState) (bool, error) {
 	if s == nil || s.RefreshToken == "" {

providers/pics_oidc.go

@@ -0,0 +1,48 @@
+package providers
+
+import (
+	"bytes"
+	"context"
+	b64 "encoding/base64"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests"
+)
+
+// enrichFromIntrospectURL enriches a session's claims and permissions via the JSON response of
+// an OIDC Introspection URL
+func (p *OIDCProvider) PicsEnrichFromIntrospectURL(ctx context.Context, s *sessions.SessionState) error {
+	clientSecret, err := p.GetClientSecret()
+	if err != nil {
+		return err
+	}
+	params := url.Values{}
+	params.Add("token", s.AccessToken)
+	basicAuth := b64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", p.ClientID, clientSecret)))
+	if p.IntrospectURL == nil {
+		p.IntrospectURL = &url.URL{
+			Scheme: p.RedeemURL.Scheme,
+			Host:   p.RedeemURL.Host,
+			Path:   "/authorize/oauth2/v4/introspect",
+		}
+	}
+	logger.Printf("Requesting introspect from '%s'", p.IntrospectURL)
+
+	result := requests.New(p.IntrospectURL.String()).
+		WithContext(ctx).
+		WithMethod("POST").
+		WithBody(bytes.NewBufferString(params.Encode())).
+		SetHeader("Authorization", fmt.Sprintf("Basic %s", basicAuth)).
+		SetHeader("Content-Type", "application/x-www-form-urlencoded").
+		Do()
+
+	if result.StatusCode() != http.StatusOK {
+		return fmt.Errorf("error while requesting introspect claims, status code - %d", result.StatusCode())
+	}
+	s.IntrospectClaims = b64.StdEncoding.EncodeToString(result.Body())
+	return nil
+}