Move provider initialisation into providers package

docs/docs/configuration/alpha_config.md

@@ -305,7 +305,7 @@ Provider holds all configuration for a single provider
 | `oidcConfig` | _[OIDCOptions](#oidcoptions)_ | OIDCConfig holds all configurations for OIDC provider<br/>or providers utilize OIDC configurations. |
 | `loginGovConfig` | _[LoginGovOptions](#logingovoptions)_ | LoginGovConfig holds all configurations for LoginGov provider. |
 | `id` | _string_ | ID should be a unique identifier for the provider.<br/>This value is required for all providers. |
-| `provider` | _string_ | Type is the OAuth provider<br/>must be set from the supported providers group,<br/>otherwise 'Google' is set as default |
+| `provider` | _[ProviderType](#providertype)_ | Type is the OAuth provider<br/>must be set from the supported providers group,<br/>otherwise 'Google' is set as default |
 | `name` | _string_ | Name is the providers display name<br/>if set, it will be shown to the users in the login page. |
 | `caFiles` | _[]string_ | CAFiles is a list of paths to CA certificates that should be used when connecting to the provider.<br/>If not specified, the default Go trust sources are used instead |
 | `loginURL` | _string_ | LoginURL is the authentication endpoint |
@@ -319,6 +319,17 @@ Provider holds all configuration for a single provider
 | `allowedGroups` | _[]string_ | AllowedGroups is a list of restrict logins to members of this group |
 | `acrValues` | _string_ | AcrValues is a string of acr values |
 
+### ProviderType
+#### (`string` alias)
+
+(**Appears on:** [Provider](#provider))
+
+ProviderType is used to enumerate the different provider type options
+Valid options are: adfs, azure, bitbucket, digitalocean facebook, github,
+gitlab, google, keycloak, keycloak-oidc, linkedin, login.gov, nextcloud
+and oidc.
+
+
 ### Providers
 
 #### ([[]Provider](#provider) alias)

pkg/apis/options/legacy_options.go

@@ -624,7 +624,7 @@ func (l *LegacyProvider) convert() (Providers, error) {
 		ClientID:          l.ClientID,
 		ClientSecret:      l.ClientSecret,
 		ClientSecretFile:  l.ClientSecretFile,
-		Type:              l.ProviderType,
+		Type:              ProviderType(l.ProviderType),
 		CAFiles:           l.ProviderCAFiles,
 		LoginURL:          l.LoginURL,
 		RedeemURL:         l.RedeemURL,

pkg/apis/options/providers.go

@@ -52,7 +52,7 @@ type Provider struct {
 	// Type is the OAuth provider
 	// must be set from the supported providers group,
 	// otherwise 'Google' is set as default
-	Type string `json:"provider,omitempty"`
+	Type ProviderType `json:"provider,omitempty"`
 	// Name is the providers display name
 	// if set, it will be shown to the users in the login page.
 	Name string `json:"name,omitempty"`
@@ -84,6 +84,56 @@ type Provider struct {
 	AcrValues string `json:"acrValues,omitempty"`
 }
 
+// ProviderType is used to enumerate the different provider type options
+// Valid options are: adfs, azure, bitbucket, digitalocean facebook, github,
+// gitlab, google, keycloak, keycloak-oidc, linkedin, login.gov, nextcloud
+// and oidc.
+type ProviderType string
+
+const (
+	// ADFSProvider is the provider type for ADFS
+	ADFSProvider ProviderType = "adfs"
+
+	// AzureProvider is the provider type for Azure
+	AzureProvider ProviderType = "azure"
+
+	// BitbucketProvider is the provider type for Bitbucket
+	BitbucketProvider ProviderType = "bitbucket"
+
+	// DigitalOceanProvider is the provider type for DigitalOcean
+	DigitalOceanProvider ProviderType = "digitalocean"
+
+	// FacebookProvider is the provider type for Facebook
+	FacebookProvider ProviderType = "facebook"
+
+	// GitHubProvider is the provider type for GitHub
+	GitHubProvider ProviderType = "github"
+
+	// GitLabProvider is the provider type for GitLab
+	GitLabProvider ProviderType = "gitlab"
+
+	// GoogleProvider is the provider type for GoogleProvider
+	GoogleProvider ProviderType = "google"
+
+	// KeycloakProvider is the provider type for Keycloak
+	KeycloakProvider ProviderType = "keycloak"
+
+	// KeycloakOIDCProvider is the provider type for Keycloak OIDC
+	KeycloakOIDCProvider ProviderType = "keycloak-oidc"
+
+	// LinkedInProvider is the provider type for LinkedIn
+	LinkedInProvider ProviderType = "linkedin"
+
+	// LoginGovProvider is the provider type for LoginGov
+	LoginGovProvider ProviderType = "login.gov"
+
+	// NextCloudProvider is the provider type for NextCloud
+	NextCloudProvider ProviderType = "nextcloud"
+
+	// OIDCProvider is the provider type for OIDC
+	OIDCProvider ProviderType = "oidc"
+)
+
 type KeycloakOptions struct {
 	// Group enables to restrict login to members of indicated group
 	Groups []string `json:"groups,omitempty"`

providers/adfs.go

@@ -6,6 +6,7 @@ import (
 	"net/url"
 	"strings"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 )
 
@@ -24,12 +25,11 @@ var _ Provider = (*ADFSProvider)(nil)
 const (
 	adfsProviderName = "ADFS"
 	adfsDefaultScope = "openid email profile"
-	adfsSkipScope    = false
 	adfsUPNClaim     = "upn"
 )
 
 // NewADFSProvider initiates a new ADFSProvider
-func NewADFSProvider(p *ProviderData) *ADFSProvider {
+func NewADFSProvider(p *ProviderData, opts options.ADFSOptions) *ADFSProvider {
 	p.setProviderDefaults(providerDefaults{
 		name:  adfsProviderName,
 		scope: adfsDefaultScope,
@@ -53,17 +53,12 @@ func NewADFSProvider(p *ProviderData) *ADFSProvider {
 
 	return &ADFSProvider{
 		OIDCProvider:    oidcProvider,
-		skipScope:       adfsSkipScope,
+		skipScope:       opts.SkipScope,
 		oidcEnrichFunc:  oidcProvider.EnrichSession,
 		oidcRefreshFunc: oidcProvider.RefreshSession,
 	}
 }
 
-// Configure defaults the ADFSProvider configuration options
-func (p *ADFSProvider) Configure(skipScope bool) {
-	p.skipScope = skipScope
-}
-
 // GetLoginURL Override to double encode the state parameter. If not query params are lost
 // More info here: https://docs.microsoft.com/en-us/powerapps/maker/portals/configure/configure-saml2-settings
 func (p *ADFSProvider) GetLoginURL(redirectURI, state, nonce string) string {

providers/adfs_test.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/coreos/go-oidc/v3/oidc"
 	"github.com/golang-jwt/jwt"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	internaloidc "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/oidc"
 	. "github.com/onsi/ginkgo"
@@ -61,8 +62,8 @@ func testADFSProvider(hostname string) *ADFSProvider {
 		ValidateURL:  &url.URL{},
 		Scope:        "",
 		Verifier:     o,
-		EmailClaim:   OIDCEmailClaim,
-	})
+		EmailClaim:   options.OIDCEmailClaim,
+	}, options.ADFSOptions{})
 
 	if hostname != "" {
 		updateURL(p.Data().LoginURL, hostname)
@@ -133,7 +134,7 @@ var _ = Describe("ADFS Provider Tests", func() {
 
 	Context("New Provider Init", func() {
 		It("uses defaults", func() {
-			providerData := NewADFSProvider(&ProviderData{}).Data()
+			providerData := NewADFSProvider(&ProviderData{}, options.ADFSOptions{}).Data()
 			Expect(providerData.ProviderName).To(Equal("ADFS"))
 			Expect(providerData.Scope).To(Equal("openid email profile"))
 		})
@@ -165,8 +166,7 @@ var _ = Describe("ADFS Provider Tests", func() {
 			p := NewADFSProvider(&ProviderData{
 				ProtectedResource: resource,
 				Scope:             "",
-			})
-			p.skipScope = true
+			}, options.ADFSOptions{SkipScope: true})
 
 			result := p.GetLoginURL("https://example.com/adfs/oauth2/", "", "")
 			Expect(result).NotTo(ContainSubstring("scope="))
@@ -186,7 +186,7 @@ var _ = Describe("ADFS Provider Tests", func() {
 				p := NewADFSProvider(&ProviderData{
 					ProtectedResource: resource,
 					Scope:             in.scope,
-				})
+				}, options.ADFSOptions{})
 
 				Expect(p.Data().Scope).To(Equal(in.expectedScope))
 				result := p.GetLoginURL("https://example.com/adfs/oauth2/", "", "")

providers/azure.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/bitly/go-simplejson"
+	"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"
@@ -62,7 +63,7 @@ var (
 )
 
 // NewAzureProvider initiates a new AzureProvider
-func NewAzureProvider(p *ProviderData) *AzureProvider {
+func NewAzureProvider(p *ProviderData, opts options.AzureOptions) *AzureProvider {
 	p.setProviderDefaults(providerDefaults{
 		name:        azureProviderName,
 		loginURL:    azureDefaultLoginURL,
@@ -80,25 +81,19 @@ func NewAzureProvider(p *ProviderData) *AzureProvider {
 	}
 	p.getAuthorizationHeaderFunc = makeAzureHeader
 
+	tenant := "common"
+	if opts.Tenant != "" {
+		tenant = opts.Tenant
+		overrideTenantURL(p.LoginURL, azureDefaultLoginURL, tenant, "authorize")
+		overrideTenantURL(p.RedeemURL, azureDefaultRedeemURL, tenant, "token")
+	}
+
 	return &AzureProvider{
 		ProviderData: p,
-		Tenant:       "common",
+		Tenant:       tenant,
 	}
 }
 
-// Configure defaults the AzureProvider configuration options
-func (p *AzureProvider) Configure(tenant string) {
-	if tenant == "" || tenant == "common" {
-		// tenant is empty or default, remain on the default "common" tenant
-		return
-	}
-
-	// Specific tennant specified, override the Login and RedeemURLs
-	p.Tenant = tenant
-	overrideTenantURL(p.LoginURL, azureDefaultLoginURL, tenant, "authorize")
-	overrideTenantURL(p.RedeemURL, azureDefaultRedeemURL, tenant, "token")
-}
-
 func overrideTenantURL(current, defaultURL *url.URL, tenant, path string) {
 	if current == nil || current.String() == "" || current.String() == defaultURL.String() {
 		*current = url.URL{

providers/azure_test.go

@@ -15,6 +15,7 @@ import (
 
 	"github.com/coreos/go-oidc/v3/oidc"
 	"github.com/golang-jwt/jwt"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	internaloidc "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/oidc"
 
@@ -39,7 +40,7 @@ type azureOAuthPayload struct {
 	IDToken      string `json:"id_token,omitempty"`
 }
 
-func testAzureProvider(hostname string) *AzureProvider {
+func testAzureProvider(hostname string, opts options.AzureOptions) *AzureProvider {
 	verificationOptions := &internaloidc.IDTokenVerificationOptions{
 		AudienceClaims: []string{"aud"},
 		ClientID:       "cd6d4fae-f6a6-4a34-8454-2c6b598e9532",
@@ -64,7 +65,7 @@ func testAzureProvider(hostname string) *AzureProvider {
 					SkipExpiryCheck:   true,
 				},
 			), verificationOptions),
-		})
+		}, opts)
 
 	if hostname != "" {
 		updateURL(p.Data().LoginURL, hostname)
@@ -80,7 +81,7 @@ func TestNewAzureProvider(t *testing.T) {
 	g := NewWithT(t)
 
 	// Test that defaults are set when calling for a new provider with nothing set
-	providerData := NewAzureProvider(&ProviderData{}).Data()
+	providerData := NewAzureProvider(&ProviderData{}, options.AzureOptions{}).Data()
 	g.Expect(providerData.ProviderName).To(Equal("Azure"))
 	g.Expect(providerData.LoginURL.String()).To(Equal("https://login.microsoftonline.com/common/oauth2/authorize"))
 	g.Expect(providerData.RedeemURL.String()).To(Equal("https://login.microsoftonline.com/common/oauth2/token"))
@@ -111,7 +112,8 @@ func TestAzureProviderOverrides(t *testing.T) {
 			ProtectedResource: &url.URL{
 				Scheme: "https",
 				Host:   "example.com"},
-			Scope: "profile"})
+			Scope: "profile"},
+		options.AzureOptions{})
 	assert.NotEqual(t, nil, p)
 	assert.Equal(t, "Azure", p.Data().ProviderName)
 	assert.Equal(t, "https://example.com/oauth/auth",
@@ -128,8 +130,7 @@ func TestAzureProviderOverrides(t *testing.T) {
 }
 
 func TestAzureSetTenant(t *testing.T) {
-	p := testAzureProvider("")
-	p.Configure("example")
+	p := testAzureProvider("", options.AzureOptions{Tenant: "example"})
 	assert.Equal(t, "Azure", p.Data().ProviderName)
 	assert.Equal(t, "example", p.Tenant)
 	assert.Equal(t, "https://login.microsoftonline.com/example/oauth2/authorize",
@@ -230,7 +231,7 @@ func TestAzureProviderEnrichSession(t *testing.T) {
 				bURL, _ := url.Parse(b.URL)
 				host = bURL.Host
 			}
-			p := testAzureProvider(host)
+			p := testAzureProvider(host, options.AzureOptions{})
 			session := CreateAuthorizedSession()
 			session.Email = testCase.Email
 			err := p.EnrichSession(context.Background(), session)
@@ -323,7 +324,7 @@ func TestAzureProviderRedeem(t *testing.T) {
 			defer b.Close()
 
 			bURL, _ := url.Parse(b.URL)
-			p := testAzureProvider(bURL.Host)
+			p := testAzureProvider(bURL.Host, options.AzureOptions{})
 			p.Data().RedeemURL.Path = "/common/oauth2/token"
 			s, err := p.Redeem(context.Background(), "https://localhost", "1234")
 			if testCase.InjectRedeemURLError {
@@ -345,7 +346,7 @@ func TestAzureProviderRedeem(t *testing.T) {
 }
 
 func TestAzureProviderProtectedResourceConfigured(t *testing.T) {
-	p := testAzureProvider("")
+	p := testAzureProvider("", options.AzureOptions{})
 	p.ProtectedResource, _ = url.Parse("http://my.resource.test")
 	result := p.GetLoginURL("https://my.test.app/oauth", "", "")
 	assert.Contains(t, result, "resource="+url.QueryEscape("http://my.resource.test"))
@@ -381,7 +382,7 @@ func TestAzureProviderRefresh(t *testing.T) {
 	b := testAzureBackend(string(payloadBytes), newAccessToken, refreshToken)
 	defer b.Close()
 	bURL, _ := url.Parse(b.URL)
-	p := testAzureProvider(bURL.Host)
+	p := testAzureProvider(bURL.Host, options.AzureOptions{})
 
 	expires := time.Now().Add(time.Duration(-1) * time.Hour)
 	session := &sessions.SessionState{AccessToken: "some_access_token", RefreshToken: refreshToken, IDToken: "some_id_token", ExpiresOn: &expires}

providers/bitbucket.go

@@ -5,6 +5,7 @@ import (
 	"net/url"
 	"strings"
 
+	"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"
@@ -53,7 +54,7 @@ var (
 )
 
 // NewBitbucketProvider initiates a new BitbucketProvider
-func NewBitbucketProvider(p *ProviderData) *BitbucketProvider {
+func NewBitbucketProvider(p *ProviderData, opts options.BitbucketOptions) *BitbucketProvider {
 	p.setProviderDefaults(providerDefaults{
 		name:        bitbucketProviderName,
 		loginURL:    bitbucketDefaultLoginURL,
@@ -62,19 +63,28 @@ func NewBitbucketProvider(p *ProviderData) *BitbucketProvider {
 		validateURL: bitbucketDefaultValidateURL,
 		scope:       bitbucketDefaultScope,
 	})
-	return &BitbucketProvider{ProviderData: p}
+
+	provider := &BitbucketProvider{ProviderData: p}
+
+	if opts.Team != "" {
+		provider.setTeam(opts.Team)
+	}
+	if opts.Repository != "" {
+		provider.setRepository(opts.Repository)
+	}
+	return provider
 }
 
-// SetTeam defines the Bitbucket team the user must be part of
-func (p *BitbucketProvider) SetTeam(team string) {
+// setTeam defines the Bitbucket team the user must be part of
+func (p *BitbucketProvider) setTeam(team string) {
 	p.Team = team
 	if !strings.Contains(p.Scope, "team") {
 		p.Scope += " team"
 	}
 }
 
-// SetRepository defines the repository the user must have access to
-func (p *BitbucketProvider) SetRepository(repository string) {
+// setRepository defines the repository the user must have access to
+func (p *BitbucketProvider) setRepository(repository string) {
 	p.Repository = repository
 	if !strings.Contains(p.Scope, "repository") {
 		p.Scope += " repository"

providers/bitbucket_test.go

@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"testing"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	. "github.com/onsi/gomega"
 	"github.com/stretchr/testify/assert"
@@ -21,15 +22,12 @@ func testBitbucketProvider(hostname, team string, repository string) *BitbucketP
 			RedeemURL:    &url.URL{},
 			ProfileURL:   &url.URL{},
 			ValidateURL:  &url.URL{},
-			Scope:        ""})
-
-	if team != "" {
-		p.SetTeam(team)
-	}
-
-	if repository != "" {
-		p.SetRepository(repository)
-	}
+			Scope:        ""},
+		options.BitbucketOptions{
+			Team:       team,
+			Repository: repository,
+		},
+	)
 
 	if hostname != "" {
 		updateURL(p.Data().LoginURL, hostname)
@@ -65,7 +63,7 @@ func TestNewBitbucketProvider(t *testing.T) {
 	g := NewWithT(t)
 
 	// Test that defaults are set when calling for a new provider with nothing set
-	providerData := NewBitbucketProvider(&ProviderData{}).Data()
+	providerData := NewBitbucketProvider(&ProviderData{}, options.BitbucketOptions{}).Data()
 	g.Expect(providerData.ProviderName).To(Equal("Bitbucket"))
 	g.Expect(providerData.LoginURL.String()).To(Equal("https://bitbucket.org/site/oauth2/authorize"))
 	g.Expect(providerData.RedeemURL.String()).To(Equal("https://bitbucket.org/site/oauth2/access_token"))
@@ -101,7 +99,8 @@ func TestBitbucketProviderOverrides(t *testing.T) {
 				Scheme: "https",
 				Host:   "example.com",
 				Path:   "/api/v3/user"},
-			Scope: "profile"})
+			Scope: "profile"},
+		options.BitbucketOptions{})
 	assert.NotEqual(t, nil, p)
 	assert.Equal(t, "Bitbucket", p.Data().ProviderName)
 	assert.Equal(t, "https://example.com/oauth/auth",

providers/github.go

@@ -11,6 +11,7 @@ import (
 	"strconv"
 	"strings"
 
+	"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"
@@ -62,7 +63,7 @@ var (
 )
 
 // NewGitHubProvider initiates a new GitHubProvider
-func NewGitHubProvider(p *ProviderData) *GitHubProvider {
+func NewGitHubProvider(p *ProviderData, opts options.GitHubOptions) *GitHubProvider {
 	p.setProviderDefaults(providerDefaults{
 		name:        githubProviderName,
 		loginURL:    githubDefaultLoginURL,
@@ -71,7 +72,13 @@ func NewGitHubProvider(p *ProviderData) *GitHubProvider {
 		validateURL: githubDefaultValidateURL,
 		scope:       githubDefaultScope,
 	})
-	return &GitHubProvider{ProviderData: p}
+
+	provider := &GitHubProvider{ProviderData: p}
+
+	provider.setOrgTeam(opts.Org, opts.Team)
+	provider.setRepo(opts.Repo, opts.Token)
+	provider.setUsers(opts.Users)
+	return provider
 }
 
 func makeGitHubHeader(accessToken string) http.Header {
@@ -82,8 +89,8 @@ func makeGitHubHeader(accessToken string) http.Header {
 	return makeAuthorizationHeader(tokenTypeToken, accessToken, extraHeaders)
 }
 
-// SetOrgTeam adds GitHub org reading parameters to the OAuth2 scope
-func (p *GitHubProvider) SetOrgTeam(org, team string) {
+// setOrgTeam adds GitHub org reading parameters to the OAuth2 scope
+func (p *GitHubProvider) setOrgTeam(org, team string) {
 	p.Org = org
 	p.Team = team
 	if org != "" || team != "" {
@@ -91,14 +98,14 @@ func (p *GitHubProvider) SetOrgTeam(org, team string) {
 	}
 }
 
-// SetRepo configures the target repository and optional token to use
-func (p *GitHubProvider) SetRepo(repo, token string) {
+// setRepo configures the target repository and optional token to use
+func (p *GitHubProvider) setRepo(repo, token string) {
 	p.Repo = repo
 	p.Token = token
 }
 
-// SetUsers configures allowed usernames
-func (p *GitHubProvider) SetUsers(users []string) {
+// setUsers configures allowed usernames
+func (p *GitHubProvider) setUsers(users []string) {
 	p.Users = users
 }
 

providers/github_test.go

@@ -7,12 +7,13 @@ import (
 	"net/url"
 	"testing"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	. "github.com/onsi/gomega"
 	"github.com/stretchr/testify/assert"
 )
 
-func testGitHubProvider(hostname string) *GitHubProvider {
+func testGitHubProvider(hostname string, opts options.GitHubOptions) *GitHubProvider {
 	p := NewGitHubProvider(
 		&ProviderData{
 			ProviderName: "",
@@ -20,7 +21,8 @@ func testGitHubProvider(hostname string) *GitHubProvider {
 			RedeemURL:    &url.URL{},
 			ProfileURL:   &url.URL{},
 			ValidateURL:  &url.URL{},
-			Scope:        ""})
+			Scope:        ""},
+		opts)
 	if hostname != "" {
 		updateURL(p.Data().LoginURL, hostname)
 		updateURL(p.Data().RedeemURL, hostname)
@@ -71,7 +73,7 @@ func TestNewGitHubProvider(t *testing.T) {
 	g := NewWithT(t)
 
 	// Test that defaults are set when calling for a new provider with nothing set
-	providerData := NewGitHubProvider(&ProviderData{}).Data()
+	providerData := NewGitHubProvider(&ProviderData{}, options.GitHubOptions{}).Data()
 	g.Expect(providerData.ProviderName).To(Equal("GitHub"))
 	g.Expect(providerData.LoginURL.String()).To(Equal("https://github.com/login/oauth/authorize"))
 	g.Expect(providerData.RedeemURL.String()).To(Equal("https://github.com/login/oauth/access_token"))
@@ -95,7 +97,8 @@ func TestGitHubProviderOverrides(t *testing.T) {
 				Scheme: "https",
 				Host:   "api.example.com",
 				Path:   "/"},
-			Scope: "profile"})
+			Scope: "profile"},
+		options.GitHubOptions{})
 	assert.NotEqual(t, nil, p)
 	assert.Equal(t, "GitHub", p.Data().ProviderName)
 	assert.Equal(t, "https://example.com/login/oauth/authorize",
@@ -114,7 +117,7 @@ func TestGitHubProvider_getEmail(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
+	p := testGitHubProvider(bURL.Host, options.GitHubOptions{})
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -129,7 +132,7 @@ func TestGitHubProvider_getEmailNotVerified(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
+	p := testGitHubProvider(bURL.Host, options.GitHubOptions{})
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -149,8 +152,11 @@ func TestGitHubProvider_getEmailWithOrg(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.Org = "testorg1"
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Org: "testorg1",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -166,8 +172,12 @@ func TestGitHubProvider_getEmailWithWriteAccessToPublicRepo(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -183,8 +193,12 @@ func TestGitHubProvider_getEmailWithReadOnlyAccessToPrivateRepo(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -200,8 +214,12 @@ func TestGitHubProvider_getEmailWithWriteAccessToPrivateRepo(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -216,8 +234,11 @@ func TestGitHubProvider_getEmailWithNoAccessToPrivateRepo(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo: "oauth2-proxy/oauth2-proxy",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -232,8 +253,12 @@ func TestGitHubProvider_getEmailWithToken(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "token")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -248,7 +273,7 @@ func TestGitHubProvider_getEmailFailedRequest(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
+	p := testGitHubProvider(bURL.Host, options.GitHubOptions{})
 
 	// We'll trigger a request failure by using an unexpected access
 	// token. Alternatively, we could allow the parsing of the payload as
@@ -266,7 +291,7 @@ func TestGitHubProvider_getEmailNotPresentInPayload(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
+	p := testGitHubProvider(bURL.Host, options.GitHubOptions{})
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -281,7 +306,7 @@ func TestGitHubProvider_getUser(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
+	p := testGitHubProvider(bURL.Host, options.GitHubOptions{})
 
 	session := CreateAuthorizedSession()
 	err := p.getUser(context.Background(), session)
@@ -297,8 +322,12 @@ func TestGitHubProvider_getUserWithRepoAndToken(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "token")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getUser(context.Background(), session)
@@ -311,8 +340,12 @@ func TestGitHubProvider_getUserWithRepoAndTokenWithoutPushAccess(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "token")
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getUser(context.Background(), session)
@@ -328,8 +361,11 @@ func TestGitHubProvider_getEmailWithUsername(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetUsers([]string{"mbland", "octocat"})
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Users: []string{"mbland", "octocat"},
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -345,8 +381,11 @@ func TestGitHubProvider_getEmailWithNotAllowedUsername(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetUsers([]string{"octocat"})
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Users: []string{"octocat"},
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -366,9 +405,12 @@ func TestGitHubProvider_getEmailWithUsernameAndNotBelongToOrg(t *testing.T) {
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetOrgTeam("not_belong_to", "")
-	p.SetUsers([]string{"mbland"})
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Org:   "not_belog_to",
+			Users: []string{"mbland"},
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)
@@ -385,9 +427,13 @@ func TestGitHubProvider_getEmailWithUsernameAndNoAccessToPrivateRepo(t *testing.
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
-	p := testGitHubProvider(bURL.Host)
-	p.SetRepo("oauth2-proxy/oauth2-proxy", "")
-	p.SetUsers([]string{"mbland"})
+	p := testGitHubProvider(bURL.Host,
+		options.GitHubOptions{
+			Repo:  "oauth2-proxy/oauth2-proxy",
+			Token: "token",
+			Users: []string{"mbland"},
+		},
+	)
 
 	session := CreateAuthorizedSession()
 	err := p.getEmail(context.Background(), session)

providers/gitlab.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"
 
+	"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"
@@ -30,7 +31,7 @@ type GitLabProvider struct {
 var _ Provider = (*GitLabProvider)(nil)
 
 // NewGitLabProvider initiates a new GitLabProvider
-func NewGitLabProvider(p *ProviderData) *GitLabProvider {
+func NewGitLabProvider(p *ProviderData, opts options.GitLabOptions) (*GitLabProvider, error) {
 	p.ProviderName = gitlabProviderName
 	if p.Scope == "" {
 		p.Scope = gitlabDefaultScope
@@ -41,15 +42,22 @@ func NewGitLabProvider(p *ProviderData) *GitLabProvider {
 		SkipNonce:    false,
 	}
 
-	return &GitLabProvider{
+	provider := &GitLabProvider{
 		OIDCProvider:    oidcProvider,
 		oidcRefreshFunc: oidcProvider.RefreshSession,
 	}
+	provider.setAllowedGroups(opts.Group)
+
+	if err := provider.setAllowedProjects(opts.Projects); err != nil {
+		return nil, fmt.Errorf("could not configure allowed projects: %v", err)
+	}
+
+	return provider, nil
 }
 
-// SetAllowedProjects adds Gitlab projects to the AllowedGroups list
+// setAllowedProjects adds Gitlab projects to the AllowedGroups list
 // and tracks them to do a project API lookup during `EnrichSession`.
-func (p *GitLabProvider) SetAllowedProjects(projects []string) error {
+func (p *GitLabProvider) setAllowedProjects(projects []string) error {
 	for _, project := range projects {
 		gp, err := newGitlabProject(project)
 		if err != nil {

providers/gitlab_test.go

@@ -7,21 +7,26 @@ import (
 	"net/http/httptest"
 	"net/url"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"
 	. "github.com/onsi/gomega"
 )
 
-func testGitLabProvider(hostname string) *GitLabProvider {
-	p := NewGitLabProvider(
+func testGitLabProvider(hostname, scope string, opts options.GitLabOptions) (*GitLabProvider, error) {
+	p, err := NewGitLabProvider(
 		&ProviderData{
 			ProviderName: "",
 			LoginURL:     &url.URL{},
 			RedeemURL:    &url.URL{},
 			ProfileURL:   &url.URL{},
 			ValidateURL:  &url.URL{},
-			Scope:        ""})
+			Scope:        scope},
+		opts)
+	if err != nil {
+		return nil, err
+	}
 	if hostname != "" {
 		updateURL(p.Data().LoginURL, hostname)
 		updateURL(p.Data().RedeemURL, hostname)
@@ -29,7 +34,7 @@ func testGitLabProvider(hostname string) *GitLabProvider {
 		updateURL(p.Data().ValidateURL, hostname)
 	}
 
-	return p
+	return p, err
 }
 
 func testGitLabBackend() *httptest.Server {
@@ -157,7 +162,8 @@ var _ = Describe("Gitlab Provider Tests", func() {
 		bURL, err := url.Parse(b.URL)
 		Expect(err).To(BeNil())
 
-		p = testGitLabProvider(bURL.Host)
+		p, err = testGitLabProvider(bURL.Host, "", options.GitLabOptions{})
+		Expect(err).ToNot(HaveOccurred())
 	})
 
 	AfterEach(func() {
@@ -219,21 +225,23 @@ var _ = Describe("Gitlab Provider Tests", func() {
 
 		DescribeTable("should return expected results",
 			func(in entitiesTableInput) {
-				p.AllowUnverifiedEmail = true
-				if in.scope != "" {
-					p.Scope = in.scope
-				}
-				session := &sessions.SessionState{AccessToken: "gitlab_access_token"}
+				bURL, err := url.Parse(b.URL)
+				Expect(err).To(BeNil())
 
-				p.SetAllowedGroups(in.allowedGroups)
-
-				err := p.SetAllowedProjects(in.allowedProjects)
+				p, err := testGitLabProvider(bURL.Host, in.scope, options.GitLabOptions{
+					Group:    in.allowedGroups,
+					Projects: in.allowedProjects,
+				})
 				if in.expectedError == nil {
 					Expect(err).To(BeNil())
 				} else {
 					Expect(err).To(MatchError(in.expectedError))
 					return
 				}
+
+				p.AllowUnverifiedEmail = true
+				session := &sessions.SessionState{AccessToken: "gitlab_access_token"}
+
 				Expect(p.Scope).To(Equal(in.expectedScope))
 
 				err = p.EnrichSession(context.Background(), session)
@@ -302,7 +310,7 @@ var _ = Describe("Gitlab Provider Tests", func() {
 			}),
 			Entry("invalid project format", entitiesTableInput{
 				allowedProjects: []string{"my_group/my_invalid_project=123"},
-				expectedError:   errors.New("invalid gitlab project access level specified (my_group/my_invalid_project)"),
+				expectedError:   errors.New("could not configure allowed projects: invalid gitlab project access level specified (my_group/my_invalid_project)"),
 				expectedScope:   "openid email read_api",
 			}),
 		)

providers/google.go

@@ -10,9 +10,11 @@ import (
 	"io"
 	"io/ioutil"
 	"net/url"
+	"os"
 	"strings"
 	"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"
@@ -79,7 +81,7 @@ var (
 )
 
 // NewGoogleProvider initiates a new GoogleProvider
-func NewGoogleProvider(p *ProviderData) *GoogleProvider {
+func NewGoogleProvider(p *ProviderData, opts options.GoogleOptions) (*GoogleProvider, error) {
 	p.setProviderDefaults(providerDefaults{
 		name:        googleProviderName,
 		loginURL:    googleDefaultLoginURL,
@@ -88,7 +90,7 @@ func NewGoogleProvider(p *ProviderData) *GoogleProvider {
 		validateURL: googleDefaultValidateURL,
 		scope:       googleDefaultScope,
 	})
-	return &GoogleProvider{
+	provider := &GoogleProvider{
 		ProviderData: p,
 		// Set a default groupValidator to just always return valid (true), it will
 		// be overwritten if we configured a Google group restriction.
@@ -96,6 +98,21 @@ func NewGoogleProvider(p *ProviderData) *GoogleProvider {
 			return true
 		},
 	}
+
+	if opts.ServiceAccountJSON != "" {
+		file, err := os.Open(opts.ServiceAccountJSON)
+		if err != nil {
+			return nil, fmt.Errorf("invalid Google credentials file: %s", opts.ServiceAccountJSON)
+		}
+
+		// Backwards compatibility with `--google-group` option
+		if len(opts.Groups) > 0 {
+			provider.setAllowedGroups(opts.Groups)
+		}
+		provider.setGroupRestriction(opts.Groups, opts.AdminEmail, file)
+	}
+
+	return provider, nil
 }
 
 func claimsFromIDToken(idToken string) (*claims, error) {
@@ -195,7 +212,7 @@ func (p *GoogleProvider) EnrichSession(_ context.Context, s *sessions.SessionSta
 // account credentials.
 //
 // TODO (@NickMeves) - Unit Test this OR refactor away from groupValidator func
-func (p *GoogleProvider) SetGroupRestriction(groups []string, adminEmail string, credentialsReader io.Reader) {
+func (p *GoogleProvider) setGroupRestriction(groups []string, adminEmail string, credentialsReader io.Reader) {
 	adminService := getAdminService(adminEmail, credentialsReader)
 	p.groupValidator = func(s *sessions.SessionState) bool {
 		// Reset our saved Groups in case membership changed

providers/google_test.go

@@ -10,6 +10,7 @@ import (
 	"net/url"
 	"testing"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	. "github.com/onsi/gomega"
 	"github.com/stretchr/testify/assert"
@@ -25,22 +26,29 @@ func newRedeemServer(body []byte) (*url.URL, *httptest.Server) {
 	return u, s
 }
 
-func newGoogleProvider() *GoogleProvider {
-	return NewGoogleProvider(
+func newGoogleProvider(t *testing.T) *GoogleProvider {
+	g := NewWithT(t)
+	p, err := NewGoogleProvider(
 		&ProviderData{
 			ProviderName: "",
 			LoginURL:     &url.URL{},
 			RedeemURL:    &url.URL{},
 			ProfileURL:   &url.URL{},
 			ValidateURL:  &url.URL{},
-			Scope:        ""})
+			Scope:        ""},
+		options.GoogleOptions{})
+	g.Expect(err).ToNot(HaveOccurred())
+	return p
 }
 
 func TestNewGoogleProvider(t *testing.T) {
 	g := NewWithT(t)
 
 	// Test that defaults are set when calling for a new provider with nothing set
-	providerData := NewGoogleProvider(&ProviderData{}).Data()
+	provider, err := NewGoogleProvider(&ProviderData{}, options.GoogleOptions{})
+	g.Expect(err).ToNot(HaveOccurred())
+	providerData := provider.Data()
+
 	g.Expect(providerData.ProviderName).To(Equal("Google"))
 	g.Expect(providerData.LoginURL.String()).To(Equal("https://accounts.google.com/o/oauth2/auth?access_type=offline"))
 	g.Expect(providerData.RedeemURL.String()).To(Equal("https://www.googleapis.com/oauth2/v3/token"))
@@ -50,7 +58,7 @@ func TestNewGoogleProvider(t *testing.T) {
 }
 
 func TestGoogleProviderOverrides(t *testing.T) {
-	p := NewGoogleProvider(
+	p, err := NewGoogleProvider(
 		&ProviderData{
 			LoginURL: &url.URL{
 				Scheme: "https",
@@ -68,7 +76,9 @@ func TestGoogleProviderOverrides(t *testing.T) {
 				Scheme: "https",
 				Host:   "example.com",
 				Path:   "/oauth/tokeninfo"},
-			Scope: "profile"})
+			Scope: "profile"},
+		options.GoogleOptions{})
+	assert.NoError(t, err)
 	assert.NotEqual(t, nil, p)
 	assert.Equal(t, "Google", p.Data().ProviderName)
 	assert.Equal(t, "https://example.com/oauth/auth",
@@ -90,7 +100,7 @@ type redeemResponse struct {
 }
 
 func TestGoogleProviderGetEmailAddress(t *testing.T) {
-	p := newGoogleProvider()
+	p := newGoogleProvider(t)
 	body, err := json.Marshal(redeemResponse{
 		AccessToken:  "a1234",
 		ExpiresIn:    10,
@@ -147,7 +157,7 @@ func TestGoogleProviderGroupValidator(t *testing.T) {
 	for name, tc := range testCases {
 		t.Run(name, func(t *testing.T) {
 			g := NewWithT(t)
-			p := newGoogleProvider()
+			p := newGoogleProvider(t)
 			if tc.validatorFunc != nil {
 				p.groupValidator = tc.validatorFunc
 			}
@@ -158,7 +168,7 @@ func TestGoogleProviderGroupValidator(t *testing.T) {
 
 //
 func TestGoogleProviderGetEmailAddressInvalidEncoding(t *testing.T) {
-	p := newGoogleProvider()
+	p := newGoogleProvider(t)
 	body, err := json.Marshal(redeemResponse{
 		AccessToken: "a1234",
 		IDToken:     "ignored prefix." + `{"email": "michael.bland@gsa.gov"}`,
@@ -176,7 +186,7 @@ func TestGoogleProviderGetEmailAddressInvalidEncoding(t *testing.T) {
 }
 
 func TestGoogleProviderRedeemFailsNoCLientSecret(t *testing.T) {
-	p := newGoogleProvider()
+	p := newGoogleProvider(t)
 	p.ProviderData.ClientSecretFile = "srvnoerre"
 
 	session, err := p.Redeem(context.Background(), "http://redirect/", "code1234")
@@ -188,7 +198,7 @@ func TestGoogleProviderRedeemFailsNoCLientSecret(t *testing.T) {
 }
 
 func TestGoogleProviderGetEmailAddressInvalidJson(t *testing.T) {
-	p := newGoogleProvider()
+	p := newGoogleProvider(t)
 
 	body, err := json.Marshal(redeemResponse{
 		AccessToken: "a1234",
@@ -208,7 +218,7 @@ func TestGoogleProviderGetEmailAddressInvalidJson(t *testing.T) {
 }
 
 func TestGoogleProviderGetEmailAddressEmailMissing(t *testing.T) {
-	p := newGoogleProvider()
+	p := newGoogleProvider(t)
 	body, err := json.Marshal(redeemResponse{
 		AccessToken: "a1234",
 		IDToken:     "ignored prefix." + base64.URLEncoding.EncodeToString([]byte(`{"not_email": "missing"}`)),

providers/keycloak.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/url"
 
+	"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"
@@ -48,7 +49,7 @@ var (
 )
 
 // NewKeycloakProvider creates a KeyCloakProvider using the passed ProviderData
-func NewKeycloakProvider(p *ProviderData) *KeycloakProvider {
+func NewKeycloakProvider(p *ProviderData, opts options.KeycloakOptions) *KeycloakProvider {
 	p.setProviderDefaults(providerDefaults{
 		name:        keycloakProviderName,
 		loginURL:    keycloakDefaultLoginURL,
@@ -57,7 +58,10 @@ func NewKeycloakProvider(p *ProviderData) *KeycloakProvider {
 		validateURL: keycloakDefaultValidateURL,
 		scope:       keycloakDefaultScope,
 	})
-	return &KeycloakProvider{ProviderData: p}
+
+	provider := &KeycloakProvider{ProviderData: p}
+	provider.setAllowedGroups(opts.Groups)
+	return provider
 }
 
 // EnrichSession uses the Keycloak userinfo endpoint to populate the session's

providers/keycloak_oidc.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 )
 
@@ -15,21 +16,25 @@ type KeycloakOIDCProvider struct {
 }
 
 // NewKeycloakOIDCProvider makes a KeycloakOIDCProvider using the ProviderData
-func NewKeycloakOIDCProvider(p *ProviderData) *KeycloakOIDCProvider {
+func NewKeycloakOIDCProvider(p *ProviderData, opts options.KeycloakOptions) *KeycloakOIDCProvider {
 	p.ProviderName = keycloakOIDCProviderName
-	return &KeycloakOIDCProvider{
+
+	provider := &KeycloakOIDCProvider{
 		OIDCProvider: &OIDCProvider{
 			ProviderData: p,
 		},
 	}
+
+	provider.addAllowedRoles(opts.Roles)
+	return provider
 }
 
 var _ Provider = (*KeycloakOIDCProvider)(nil)
 
-// AddAllowedRoles sets Keycloak roles that are authorized.
+// addAllowedRoles sets Keycloak roles that are authorized.
 // Assumes `SetAllowedGroups` is already called on groups and appends to that
 // with `role:` prefixed roles.
-func (p *KeycloakOIDCProvider) AddAllowedRoles(roles []string) {
+func (p *KeycloakOIDCProvider) addAllowedRoles(roles []string) {
 	if p.AllowedGroups == nil {
 		p.AllowedGroups = make(map[string]struct{})
 	}

providers/keycloak_oidc_test.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/coreos/go-oidc/v3/oidc"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -39,11 +40,11 @@ func getAccessToken() string {
 
 func newTestKeycloakOIDCSetup() (*httptest.Server, *KeycloakOIDCProvider) {
 	redeemURL, server := newOIDCServer([]byte(fmt.Sprintf(`{"email": "new@thing.com", "expires_in": 300, "access_token": "%v"}`, getAccessToken())))
-	provider := newKeycloakOIDCProvider(redeemURL)
+	provider := newKeycloakOIDCProvider(redeemURL, options.KeycloakOptions{})
 	return server, provider
 }
 
-func newKeycloakOIDCProvider(serverURL *url.URL) *KeycloakOIDCProvider {
+func newKeycloakOIDCProvider(serverURL *url.URL, opts options.KeycloakOptions) *KeycloakOIDCProvider {
 	verificationOptions := &internaloidc.IDTokenVerificationOptions{
 		AudienceClaims: []string{defaultAudienceClaim},
 		ClientID:       mockClientID,
@@ -66,7 +67,8 @@ func newKeycloakOIDCProvider(serverURL *url.URL) *KeycloakOIDCProvider {
 				Scheme: "https",
 				Host:   "keycloak-oidc.com",
 				Path:   "/api/v3/user"},
-			Scope: "openid email profile"})
+			Scope: "openid email profile"},
+		opts)
 
 	if serverURL != nil {
 		p.RedeemURL.Scheme = serverURL.Scheme
@@ -88,7 +90,7 @@ func newKeycloakOIDCProvider(serverURL *url.URL) *KeycloakOIDCProvider {
 var _ = Describe("Keycloak OIDC Provider Tests", func() {
 	Context("New Provider Init", func() {
 		It("creates new keycloak oidc provider with expected defaults", func() {
-			p := newKeycloakOIDCProvider(nil)
+			p := newKeycloakOIDCProvider(nil, options.KeycloakOptions{})
 			providerData := p.Data()
 			Expect(providerData.ProviderName).To(Equal(keycloakOIDCProviderName))
 			Expect(providerData.LoginURL.String()).To(Equal("https://keycloak-oidc.com/oauth/auth"))
@@ -101,8 +103,9 @@ var _ = Describe("Keycloak OIDC Provider Tests", func() {
 
 	Context("Allowed Roles", func() {
 		It("should prefix allowed roles and add them to groups", func() {
-			p := newKeycloakOIDCProvider(nil)
-			p.AddAllowedRoles([]string{"admin", "editor"})
+			p := newKeycloakOIDCProvider(nil, options.KeycloakOptions{
+				Roles: []string{"admin", "editor"},
+			})
 			Expect(p.AllowedGroups).To(HaveKey("role:admin"))
 			Expect(p.AllowedGroups).To(HaveKey("role:editor"))
 		})

providers/keycloak_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http/httptest"
 	"net/url"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"
@@ -27,7 +28,8 @@ func testKeycloakProvider(backend *httptest.Server) (*KeycloakProvider, error) {
 			RedeemURL:    &url.URL{},
 			ProfileURL:   &url.URL{},
 			ValidateURL:  &url.URL{},
-			Scope:        ""})
+			Scope:        ""},
+		options.KeycloakOptions{})
 
 	if backend != nil {
 		bURL, err := url.Parse(backend.URL)
@@ -48,7 +50,7 @@ func testKeycloakProvider(backend *httptest.Server) (*KeycloakProvider, error) {
 var _ = Describe("Keycloak Provider Tests", func() {
 	Context("New Provider Init", func() {
 		It("uses defaults", func() {
-			providerData := NewKeycloakProvider(&ProviderData{}).Data()
+			providerData := NewKeycloakProvider(&ProviderData{}, options.KeycloakOptions{}).Data()
 			Expect(providerData.ProviderName).To(Equal("Keycloak"))
 			Expect(providerData.LoginURL.String()).To(Equal("https://keycloak.org/oauth/authorize"))
 			Expect(providerData.RedeemURL.String()).To(Equal("https://keycloak.org/oauth/token"))
@@ -76,7 +78,8 @@ var _ = Describe("Keycloak Provider Tests", func() {
 						Scheme: "https",
 						Host:   "example.com",
 						Path:   "/api/v3/user"},
-					Scope: "profile"})
+					Scope: "profile"},
+				options.KeycloakOptions{})
 			providerData := p.Data()
 
 			Expect(providerData.ProviderName).To(Equal("Keycloak"))

providers/logingov.go

@@ -5,12 +5,15 @@ import (
 	"context"
 	"crypto/rand"
 	"crypto/rsa"
+	"errors"
 	"fmt"
+	"io/ioutil"
 	"math/big"
 	"net/url"
 	"time"
 
 	"github.com/golang-jwt/jwt"
+	"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/requests"
 	"gopkg.in/square/go-jose.v2"
@@ -78,7 +81,7 @@ var (
 )
 
 // NewLoginGovProvider initiates a new LoginGovProvider
-func NewLoginGovProvider(p *ProviderData) *LoginGovProvider {
+func NewLoginGovProvider(p *ProviderData, opts options.LoginGovOptions) (*LoginGovProvider, error) {
 	p.setProviderDefaults(providerDefaults{
 		name:        loginGovProviderName,
 		loginURL:    loginGovDefaultLoginURL,
@@ -87,10 +90,50 @@ func NewLoginGovProvider(p *ProviderData) *LoginGovProvider {
 		validateURL: loginGovDefaultProfileURL,
 		scope:       loginGovDefaultScope,
 	})
-	return &LoginGovProvider{
+	provider := &LoginGovProvider{
 		ProviderData: p,
 		Nonce:        randSeq(32),
 	}
+
+	if err := provider.configure(opts); err != nil {
+		return nil, fmt.Errorf("could not configure login.gov provider: %v", err)
+	}
+	return provider, nil
+}
+
+func (p *LoginGovProvider) configure(opts options.LoginGovOptions) error {
+	pubJWKURL, err := url.Parse(opts.PubJWKURL)
+	if err != nil {
+		return fmt.Errorf("could not parse Public JWK URL: %v", err)
+	}
+	p.PubJWKURL = pubJWKURL
+
+	// JWT key can be supplied via env variable or file in the filesystem, but not both.
+	switch {
+	case opts.JWTKey != "" && opts.JWTKeyFile != "":
+		return errors.New("cannot set both jwt-key and jwt-key-file options")
+	case opts.JWTKey == "" && opts.JWTKeyFile == "":
+		return errors.New("login.gov provider requires a private key for signing JWTs")
+	case opts.JWTKey != "":
+		// The JWT Key is in the commandline argument
+		signKey, err := jwt.ParseRSAPrivateKeyFromPEM([]byte(opts.JWTKey))
+		if err != nil {
+			return fmt.Errorf("could not parse RSA Private Key PEM: %v", err)
+		}
+		p.JWTKey = signKey
+	case opts.JWTKeyFile != "":
+		// The JWT key is in the filesystem
+		keyData, err := ioutil.ReadFile(opts.JWTKeyFile)
+		if err != nil {
+			return fmt.Errorf("could not read key file: %v", opts.JWTKeyFile)
+		}
+		signKey, err := jwt.ParseRSAPrivateKeyFromPEM(keyData)
+		if err != nil {
+			return fmt.Errorf("could not parse private key from PEM file: %v", opts.JWTKeyFile)
+		}
+		p.JWTKey = signKey
+	}
+	return nil
 }
 
 type loginGovCustomClaims struct {

providers/logingov_test.go

@@ -1,11 +1,14 @@
 package providers
 
 import (
+	"bytes"
 	"context"
 	"crypto"
 	"crypto/rand"
 	"crypto/rsa"
+	"crypto/x509"
 	"encoding/json"
+	"encoding/pem"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -13,6 +16,7 @@ import (
 	"time"
 
 	"github.com/golang-jwt/jwt"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
 	. "github.com/onsi/gomega"
 	"github.com/stretchr/testify/assert"
 	"gopkg.in/square/go-jose.v2"
@@ -32,12 +36,35 @@ func newLoginGovServer(body []byte) (*url.URL, *httptest.Server) {
 	return u, s
 }
 
-func newLoginGovProvider() (l *LoginGovProvider, serverKey *MyKeyData, err error) {
+func newPrivateKeyBytes() ([]byte, error) {
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		return nil, err
+	}
+
+	keyBytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
+	if err != nil {
+		return nil, err
+	}
+
+	privateKeyBlock := &pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: keyBytes,
+	}
+	b := &bytes.Buffer{}
+	if err := pem.Encode(b, privateKeyBlock); err != nil {
+		return nil, err
+	}
+
+	return b.Bytes(), nil
+}
+
+func newLoginGovProvider() (*LoginGovProvider, *MyKeyData, error) {
 	key, err := rsa.GenerateKey(rand.Reader, 2048)
 	if err != nil {
-		return
+		return nil, nil, err
 	}
-	serverKey = &MyKeyData{
+	serverKey := &MyKeyData{
 		PubKey:  key.Public(),
 		PrivKey: key,
 		PubJWK: jose.JSONWebKey{
@@ -48,29 +75,40 @@ func newLoginGovProvider() (l *LoginGovProvider, serverKey *MyKeyData, err error
 		},
 	}
 
-	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	privKey, err := newPrivateKeyBytes()
 	if err != nil {
-		return
+		return nil, nil, err
 	}
 
-	l = NewLoginGovProvider(
+	l, err := NewLoginGovProvider(
 		&ProviderData{
 			ProviderName: "",
 			LoginURL:     &url.URL{},
 			RedeemURL:    &url.URL{},
 			ProfileURL:   &url.URL{},
 			ValidateURL:  &url.URL{},
-			Scope:        ""})
-	l.JWTKey = privateKey
+			Scope:        ""},
+		options.LoginGovOptions{
+			JWTKey: string(privKey),
+		},
+	)
 	l.Nonce = "fakenonce"
-	return
+	return l, serverKey, err
 }
 
 func TestNewLoginGovProvider(t *testing.T) {
 	g := NewWithT(t)
 
+	privKey, err := newPrivateKeyBytes()
+	g.Expect(err).ToNot(HaveOccurred())
+
 	// Test that defaults are set when calling for a new provider with nothing set
-	providerData := NewLoginGovProvider(&ProviderData{}).Data()
+	provider, err := NewLoginGovProvider(&ProviderData{}, options.LoginGovOptions{
+		JWTKey: string(privKey),
+	})
+	g.Expect(err).ToNot(HaveOccurred())
+
+	providerData := provider.Data()
 	g.Expect(providerData.ProviderName).To(Equal("login.gov"))
 	g.Expect(providerData.LoginURL.String()).To(Equal("https://secure.login.gov/openid_connect/authorize"))
 	g.Expect(providerData.RedeemURL.String()).To(Equal("https://secure.login.gov/api/openid_connect/token"))
@@ -80,7 +118,10 @@ func TestNewLoginGovProvider(t *testing.T) {
 }
 
 func TestLoginGovProviderOverrides(t *testing.T) {
-	p := NewLoginGovProvider(
+	privKey, err := newPrivateKeyBytes()
+	assert.NoError(t, err)
+
+	p, err := NewLoginGovProvider(
 		&ProviderData{
 			LoginURL: &url.URL{
 				Scheme: "https",
@@ -94,7 +135,11 @@ func TestLoginGovProviderOverrides(t *testing.T) {
 				Scheme: "https",
 				Host:   "example.com",
 				Path:   "/oauth/profile"},
-			Scope: "profile"})
+			Scope: "profile"},
+		options.LoginGovOptions{
+			JWTKey: string(privKey),
+		})
+	assert.NoError(t, err)
 	assert.NotEqual(t, nil, p)
 	assert.Equal(t, "login.gov", p.Data().ProviderName)
 	assert.Equal(t, "https://example.com/oauth/auth",

providers/nextcloud.go

@@ -1,5 +1,7 @@
 package providers
 
+import "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
+
 // NextcloudProvider represents an Nextcloud based Identity Provider
 type NextcloudProvider struct {
 	*ProviderData
@@ -13,7 +15,7 @@ const nextCloudProviderName = "Nextcloud"
 func NewNextcloudProvider(p *ProviderData) *NextcloudProvider {
 	p.ProviderName = nextCloudProviderName
 	p.getAuthorizationHeaderFunc = makeOIDCHeader
-	if p.EmailClaim == OIDCEmailClaim {
+	if p.EmailClaim == options.OIDCEmailClaim {
 		// This implies the email claim has not been overridden, we should set a default
 		// for this provider
 		p.EmailClaim = "ocs.data.email"

providers/oidc.go

@@ -7,6 +7,7 @@ import (
 	"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"
 	"golang.org/x/oauth2"
@@ -20,13 +21,13 @@ type OIDCProvider struct {
 }
 
 // NewOIDCProvider initiates a new OIDCProvider
-func NewOIDCProvider(p *ProviderData) *OIDCProvider {
+func NewOIDCProvider(p *ProviderData, opts options.OIDCOptions) *OIDCProvider {
 	p.ProviderName = "OpenID Connect"
 	p.getAuthorizationHeaderFunc = makeOIDCHeader
 
 	return &OIDCProvider{
 		ProviderData: p,
-		SkipNonce:    true,
+		SkipNonce:    opts.InsecureSkipNonce,
 	}
 }
 

providers/oidc_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"github.com/coreos/go-oidc/v3/oidc"
+	"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/encryption"
 	internaloidc "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/oidc"
@@ -25,7 +26,7 @@ type redeemTokenResponse struct {
 	IDToken      string `json:"id_token,omitempty"`
 }
 
-func newOIDCProvider(serverURL *url.URL) *OIDCProvider {
+func newOIDCProvider(serverURL *url.URL, skipNonce bool) *OIDCProvider {
 	verificationOptions := &internaloidc.IDTokenVerificationOptions{
 		AudienceClaims: []string{"aud"},
 		ClientID:       "https://test.myapp.com",
@@ -61,7 +62,9 @@ func newOIDCProvider(serverURL *url.URL) *OIDCProvider {
 		), verificationOptions),
 	}
 
-	p := NewOIDCProvider(providerData)
+	p := NewOIDCProvider(providerData, options.OIDCOptions{
+		InsecureSkipNonce: skipNonce,
+	})
 
 	return p
 }
@@ -77,7 +80,7 @@ func newOIDCServer(body []byte) (*url.URL, *httptest.Server) {
 
 func newTestOIDCSetup(body []byte) (*httptest.Server, *OIDCProvider) {
 	redeemURL, server := newOIDCServer(body)
-	provider := newOIDCProvider(redeemURL)
+	provider := newOIDCProvider(redeemURL, false)
 	return server, provider
 }
 
@@ -86,7 +89,7 @@ func TestOIDCProviderGetLoginURL(t *testing.T) {
 		Scheme: "https",
 		Host:   "oauth2proxy.oidctest",
 	}
-	provider := newOIDCProvider(serverURL)
+	provider := newOIDCProvider(serverURL, true)
 
 	n, err := encryption.Nonce()
 	assert.NoError(t, err)

providers/provider_data.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"github.com/coreos/go-oidc/v3/oidc"
+	"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"
 	internaloidc "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/oidc"
@@ -18,14 +19,10 @@ import (
 )
 
 const (
-	OIDCEmailClaim  = "email"
-	OIDCGroupsClaim = "groups"
 	// This is not exported as it's not currently user configurable
 	oidcUserClaim = "sub"
 )
 
-var OIDCAudienceClaims = []string{"aud"}
-
 // ProviderData contains information required to configure all implementations
 // of OAuth2 providers
 type ProviderData struct {
@@ -76,9 +73,9 @@ func (p *ProviderData) GetClientSecret() (clientSecret string, err error) {
 	return string(fileClientSecret), nil
 }
 
-// SetAllowedGroups organizes a group list into the AllowedGroups map
+// setAllowedGroups organizes a group list into the AllowedGroups map
 // to be consumed by Authorize implementations
-func (p *ProviderData) SetAllowedGroups(groups []string) {
+func (p *ProviderData) setAllowedGroups(groups []string) {
 	p.AllowedGroups = make(map[string]struct{}, len(groups))
 	for _, group := range groups {
 		p.AllowedGroups[group] = struct{}{}
@@ -172,7 +169,7 @@ func (p *ProviderData) buildSessionFromClaims(rawIDToken, accessToken string) (*
 
 	// `email_verified` must be present and explicitly set to `false` to be
 	// considered unverified.
-	verifyEmail := (p.EmailClaim == OIDCEmailClaim) && !p.AllowUnverifiedEmail
+	verifyEmail := (p.EmailClaim == options.OIDCEmailClaim) && !p.AllowUnverifiedEmail
 
 	var verified bool
 	exists, err := extractor.GetClaimInto("email_verified", &verified)

providers/provider_default_test.go

@@ -107,7 +107,7 @@ func TestProviderDataAuthorize(t *testing.T) {
 				Groups: tc.groups,
 			}
 			p := &ProviderData{}
-			p.SetAllowedGroups(tc.allowedGroups)
+			p.setAllowedGroups(tc.allowedGroups)
 
 			authorized, err := p.Authorize(context.Background(), session)
 			g.Expect(err).ToNot(HaveOccurred())

providers/providers.go

@@ -2,8 +2,18 @@ package providers
 
 import (
 	"context"
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
 
+	"github.com/coreos/go-oidc/v3/oidc"
+	"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"
+	internaloidc "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/oidc"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests"
+	k8serrors "k8s.io/apimachinery/pkg/util/errors"
 )
 
 // Provider represents an upstream identity provider implementation
@@ -20,38 +30,247 @@ type Provider interface {
 	CreateSessionFromToken(ctx context.Context, token string) (*sessions.SessionState, error)
 }
 
-// New provides a new Provider based on the configured provider string
-func New(provider string, p *ProviderData) Provider {
-	switch provider {
-	case "linkedin":
-		return NewLinkedInProvider(p)
-	case "facebook":
-		return NewFacebookProvider(p)
-	case "github":
-		return NewGitHubProvider(p)
-	case "keycloak":
-		return NewKeycloakProvider(p)
-	case "keycloak-oidc":
-		return NewKeycloakOIDCProvider(p)
-	case "azure":
-		return NewAzureProvider(p)
-	case "adfs":
-		return NewADFSProvider(p)
-	case "gitlab":
-		return NewGitLabProvider(p)
-	case "oidc":
-		return NewOIDCProvider(p)
-	case "login.gov":
-		return NewLoginGovProvider(p)
-	case "bitbucket":
-		return NewBitbucketProvider(p)
-	case "nextcloud":
-		return NewNextcloudProvider(p)
-	case "digitalocean":
-		return NewDigitalOceanProvider(p)
-	case "google":
-		return NewGoogleProvider(p)
+func NewProvider(providerConfig options.Provider) (Provider, error) {
+	providerData, err := newProviderDataFromConfig(providerConfig)
+	if err != nil {
+		return nil, fmt.Errorf("could not create provider data: %v", err)
+	}
+	switch providerConfig.Type {
+	case options.ADFSProvider:
+		return NewADFSProvider(providerData, providerConfig.ADFSConfig), nil
+	case options.AzureProvider:
+		return NewAzureProvider(providerData, providerConfig.AzureConfig), nil
+	case options.BitbucketProvider:
+		return NewBitbucketProvider(providerData, providerConfig.BitbucketConfig), nil
+	case options.DigitalOceanProvider:
+		return NewDigitalOceanProvider(providerData), nil
+	case options.FacebookProvider:
+		return NewFacebookProvider(providerData), nil
+	case options.GitHubProvider:
+		return NewGitHubProvider(providerData, providerConfig.GitHubConfig), nil
+	case options.GitLabProvider:
+		return NewGitLabProvider(providerData, providerConfig.GitLabConfig)
+	case options.GoogleProvider:
+		return NewGoogleProvider(providerData, providerConfig.GoogleConfig)
+	case options.KeycloakProvider:
+		return NewKeycloakProvider(providerData, providerConfig.KeycloakConfig), nil
+	case options.KeycloakOIDCProvider:
+		return NewKeycloakOIDCProvider(providerData, providerConfig.KeycloakConfig), nil
+	case options.LinkedInProvider:
+		return NewLinkedInProvider(providerData), nil
+	case options.LoginGovProvider:
+		return NewLoginGovProvider(providerData, providerConfig.LoginGovConfig)
+	case options.NextCloudProvider:
+		return NewNextcloudProvider(providerData), nil
+	case options.OIDCProvider:
+		return NewOIDCProvider(providerData, providerConfig.OIDCConfig), nil
 	default:
-		return nil
+		return nil, fmt.Errorf("unknown provider type %q", providerConfig.Type)
 	}
 }
+
+func newProviderDataFromConfig(providerConfig options.Provider) (*ProviderData, error) {
+	p := &ProviderData{
+		Scope:            providerConfig.Scope,
+		ClientID:         providerConfig.ClientID,
+		ClientSecret:     providerConfig.ClientSecret,
+		ClientSecretFile: providerConfig.ClientSecretFile,
+		Prompt:           providerConfig.Prompt,
+		ApprovalPrompt:   providerConfig.ApprovalPrompt,
+		AcrValues:        providerConfig.AcrValues,
+	}
+
+	needsVerifier, err := providerRequiresOIDCProviderVerifier(providerConfig.Type)
+	if err != nil {
+		return nil, err
+	}
+
+	if needsVerifier {
+		oidcProvider, verifier, err := newOIDCProviderVerifier(providerConfig)
+		if err != nil {
+			return nil, fmt.Errorf("error setting OIDC configuration: %v", err)
+		}
+
+		p.Verifier = verifier
+		if oidcProvider != nil {
+			// Use the discovered values rather than any specified values
+			providerConfig.LoginURL = oidcProvider.Endpoint().AuthURL
+			providerConfig.RedeemURL = oidcProvider.Endpoint().TokenURL
+		}
+	}
+
+	errs := []error{}
+	for name, u := range map[string]struct {
+		dst *url.URL
+		raw string
+	}{
+		"login":    {dst: p.LoginURL, raw: providerConfig.LoginURL},
+		"redeem":   {dst: p.RedeemURL, raw: providerConfig.RedeemURL},
+		"profile":  {dst: p.ProfileURL, raw: providerConfig.ProfileURL},
+		"validate": {dst: p.ValidateURL, raw: providerConfig.ValidateURL},
+		"resource": {dst: p.ProtectedResource, raw: providerConfig.ProtectedResource},
+	} {
+		var err error
+		u.dst, err = url.Parse(u.raw)
+		if err != nil {
+			errs = append(errs, fmt.Errorf("could not parse %s URL: %v", name, err))
+		}
+	}
+	if len(errs) > 0 {
+		return nil, k8serrors.NewAggregate(errs)
+	}
+
+	// Make the OIDC options available to all providers that support it
+	p.AllowUnverifiedEmail = providerConfig.OIDCConfig.InsecureAllowUnverifiedEmail
+	p.EmailClaim = providerConfig.OIDCConfig.EmailClaim
+	p.GroupsClaim = providerConfig.OIDCConfig.GroupsClaim
+
+	// TODO (@NickMeves) - Remove This
+	// Backwards Compatibility for Deprecated UserIDClaim option
+	if providerConfig.OIDCConfig.EmailClaim == options.OIDCEmailClaim &&
+		providerConfig.OIDCConfig.UserIDClaim != options.OIDCEmailClaim {
+		p.EmailClaim = providerConfig.OIDCConfig.UserIDClaim
+	}
+
+	if providerConfig.Scope == "" {
+		providerConfig.Scope = "openid email profile"
+
+		if len(providerConfig.AllowedGroups) > 0 {
+			providerConfig.Scope += " groups"
+		}
+	}
+	if providerConfig.OIDCConfig.UserIDClaim == "" {
+		providerConfig.OIDCConfig.UserIDClaim = "email"
+	}
+
+	p.setAllowedGroups(providerConfig.AllowedGroups)
+
+	return p, nil
+}
+
+func providerRequiresOIDCProviderVerifier(providerType options.ProviderType) (bool, error) {
+	switch providerType {
+	case options.BitbucketProvider, options.DigitalOceanProvider, options.FacebookProvider, options.GitHubProvider,
+		options.GoogleProvider, options.KeycloakProvider, options.LinkedInProvider, options.LoginGovProvider, options.NextCloudProvider:
+		return false, nil
+	case options.ADFSProvider, options.AzureProvider, options.GitLabProvider, options.KeycloakOIDCProvider, options.OIDCProvider:
+		return true, nil
+	default:
+		return false, fmt.Errorf("unknown provider type: %s", providerType)
+	}
+}
+
+func newOIDCProviderVerifier(providerConfig options.Provider) (*oidc.Provider, *internaloidc.IDTokenVerifier, error) {
+	// If the issuer isn't set, default it for platforms where it makes sense
+	if providerConfig.OIDCConfig.IssuerURL == "" {
+		switch providerConfig.Type {
+		case "gitlab":
+			providerConfig.OIDCConfig.IssuerURL = "https://gitlab.com"
+		case "oidc":
+			return nil, nil, errors.New("missing required setting: OIDC Issuer URL cannot be empty")
+		}
+	}
+
+	switch {
+	case providerConfig.OIDCConfig.InsecureSkipIssuerVerification && !providerConfig.OIDCConfig.SkipDiscovery:
+		verifier, err := newInsecureSkipIssuerVerificationOIDCVerifier(providerConfig)
+		return nil, verifier, err
+	case providerConfig.OIDCConfig.SkipDiscovery:
+		verifier, err := newSkipDiscoveryOIDCVerifier(providerConfig)
+		return nil, verifier, err
+	default:
+		return newDiscoveryOIDCProviderVerifier(providerConfig)
+	}
+}
+
+func newDiscoveryOIDCProviderVerifier(providerConfig options.Provider) (*oidc.Provider, *internaloidc.IDTokenVerifier, error) {
+	// Configure discoverable provider data.
+	provider, err := oidc.NewProvider(context.TODO(), providerConfig.OIDCConfig.IssuerURL)
+	if err != nil {
+		return nil, nil, err
+	}
+	verificationOptions := &internaloidc.IDTokenVerificationOptions{
+		AudienceClaims: providerConfig.OIDCConfig.AudienceClaims,
+		ClientID:       providerConfig.ClientID,
+		ExtraAudiences: providerConfig.OIDCConfig.ExtraAudiences,
+	}
+	verifier := internaloidc.NewVerifier(provider.Verifier(&oidc.Config{
+		ClientID:          providerConfig.ClientID,
+		SkipIssuerCheck:   providerConfig.OIDCConfig.InsecureSkipIssuerVerification,
+		SkipClientIDCheck: true, // client id check is done within oauth2-proxy: IDTokenVerifier.Verify
+	}), verificationOptions)
+
+	return provider, verifier, nil
+}
+
+func newInsecureSkipIssuerVerificationOIDCVerifier(providerConfig options.Provider) (*internaloidc.IDTokenVerifier, error) {
+	// go-oidc doesn't let us pass bypass the issuer check this in the oidc.NewProvider call
+	// (which uses discovery to get the URLs), so we'll do a quick check ourselves and if
+	// we get the URLs, we'll just use the non-discovery path.
+
+	logger.Printf("Performing OIDC Discovery...")
+
+	requestURL := strings.TrimSuffix(providerConfig.OIDCConfig.IssuerURL, "/") + "/.well-known/openid-configuration"
+	body, err := requests.New(requestURL).
+		Do().
+		UnmarshalJSON()
+	if err != nil {
+		return nil, fmt.Errorf("failed to discover OIDC configuration: %v", err)
+	}
+
+	// Prefer manually configured URLs. It's a bit unclear
+	// why you'd be doing discovery and also providing the URLs
+	// explicitly though...
+	if providerConfig.LoginURL == "" {
+		providerConfig.LoginURL = body.Get("authorization_endpoint").MustString()
+	}
+
+	if providerConfig.RedeemURL == "" {
+		providerConfig.RedeemURL = body.Get("token_endpoint").MustString()
+	}
+
+	if providerConfig.OIDCConfig.JwksURL == "" {
+		providerConfig.OIDCConfig.JwksURL = body.Get("jwks_uri").MustString()
+	}
+
+	if providerConfig.ProfileURL == "" {
+		providerConfig.ProfileURL = body.Get("userinfo_endpoint").MustString()
+	}
+
+	// Now we have performed the discovery, construct the verifier manually
+	return newSkipDiscoveryOIDCVerifier(providerConfig)
+}
+
+func newSkipDiscoveryOIDCVerifier(providerConfig options.Provider) (*internaloidc.IDTokenVerifier, error) {
+	var errs []error
+
+	// Construct a manual IDTokenVerifier from issuer URL & JWKS URI
+	// instead of metadata discovery if we enable -skip-oidc-discovery.
+	// In this case we need to make sure the required endpoints for
+	// the provider are configured.
+	if providerConfig.LoginURL == "" {
+		errs = append(errs, errors.New("missing required setting: login-url"))
+	}
+	if providerConfig.RedeemURL == "" {
+		errs = append(errs, errors.New("missing required setting: redeem-url"))
+	}
+	if providerConfig.OIDCConfig.JwksURL == "" {
+		errs = append(errs, errors.New("missing required setting: oidc-jwks-url"))
+	}
+	if len(errs) > 0 {
+		return nil, k8serrors.NewAggregate(errs)
+	}
+
+	keySet := oidc.NewRemoteKeySet(context.TODO(), providerConfig.OIDCConfig.JwksURL)
+	verificationOptions := &internaloidc.IDTokenVerificationOptions{
+		AudienceClaims: providerConfig.OIDCConfig.AudienceClaims,
+		ClientID:       providerConfig.ClientID,
+		ExtraAudiences: providerConfig.OIDCConfig.ExtraAudiences,
+	}
+	verifier := internaloidc.NewVerifier(oidc.NewVerifier(providerConfig.OIDCConfig.IssuerURL, keySet, &oidc.Config{
+		ClientID:          providerConfig.ClientID,
+		SkipIssuerCheck:   providerConfig.OIDCConfig.InsecureSkipIssuerVerification,
+		SkipClientIDCheck: true, // client id check is done within oauth2-proxy: IDTokenVerifier.Verify
+	}), verificationOptions)
+	return verifier, nil
+}

providers/providers_test.go

@@ -0,0 +1,93 @@
+package providers
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
+	. "github.com/onsi/gomega"
+)
+
+const (
+	clientID     = "bazquux"
+	clientSecret = "xyzzyplugh"
+	providerID   = "providerID"
+)
+
+func TestClientSecretFileOptionFails(t *testing.T) {
+	g := NewWithT(t)
+
+	providerConfig := options.Provider{
+		ID:               providerID,
+		Type:             "google",
+		ClientID:         clientID,
+		ClientSecretFile: clientSecret,
+	}
+
+	p, err := newProviderDataFromConfig(providerConfig)
+	g.Expect(err).ToNot(HaveOccurred())
+	g.Expect(p.ClientSecretFile).To(Equal(clientSecret))
+	g.Expect(p.ClientSecret).To(BeEmpty())
+
+	s, err := p.GetClientSecret()
+	g.Expect(err).To(HaveOccurred())
+	g.Expect(s).To(BeEmpty())
+}
+
+func TestClientSecretFileOption(t *testing.T) {
+	g := NewWithT(t)
+
+	f, err := ioutil.TempFile("", "client_secret_temp_file_")
+	g.Expect(err).ToNot(HaveOccurred())
+
+	clientSecretFileName := f.Name()
+
+	defer func() {
+		g.Expect(f.Close()).To(Succeed())
+		g.Expect(os.Remove(clientSecretFileName)).To(Succeed())
+	}()
+
+	_, err = f.WriteString("testcase")
+	g.Expect(err).ToNot(HaveOccurred())
+
+	providerConfig := options.Provider{
+		ID:               providerID,
+		Type:             "google",
+		ClientID:         clientID,
+		ClientSecretFile: clientSecretFileName,
+	}
+
+	p, err := newProviderDataFromConfig(providerConfig)
+	g.Expect(err).ToNot(HaveOccurred())
+	g.Expect(p.ClientSecretFile).To(Equal(clientSecretFileName))
+	g.Expect(p.ClientSecret).To(BeEmpty())
+
+	s, err := p.GetClientSecret()
+	g.Expect(err).ToNot(HaveOccurred())
+	g.Expect(s).To(Equal("testcase"))
+}
+
+func TestSkipOIDCDiscovery(t *testing.T) {
+	g := NewWithT(t)
+	providerConfig := options.Provider{
+		ID:               providerID,
+		Type:             "oidc",
+		ClientID:         clientID,
+		ClientSecretFile: clientSecret,
+		OIDCConfig: options.OIDCOptions{
+			IssuerURL:     "https://login.microsoftonline.com/fabrikamb2c.onmicrosoft.com/v2.0/",
+			SkipDiscovery: true,
+		},
+	}
+
+	_, err := newProviderDataFromConfig(providerConfig)
+	g.Expect(err).To(MatchError("error setting OIDC configuration: [missing required setting: login-url, missing required setting: redeem-url, missing required setting: oidc-jwks-url]"))
+
+	providerConfig.LoginURL = "https://login.microsoftonline.com/fabrikamb2c.onmicrosoft.com/oauth2/v2.0/authorize?p=b2c_1_sign_in"
+	providerConfig.RedeemURL = "https://login.microsoftonline.com/fabrikamb2c.onmicrosoft.com/oauth2/v2.0/token?p=b2c_1_sign_in"
+	providerConfig.OIDCConfig.JwksURL = "https://login.microsoftonline.com/fabrikamb2c.onmicrosoft.com/discovery/v2.0/keys"
+
+	_, err = newProviderDataFromConfig(providerConfig)
+	g.Expect(err).ToNot(HaveOccurred())
+}