113 lines
3.2 KiB
Go
113 lines
3.2 KiB
Go
package header
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import (
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"encoding/base64"
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"fmt"
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"net/http"
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"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
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"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options/util"
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sessionsapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
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)
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type Injector interface {
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Inject(http.Header, *sessionsapi.SessionState)
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}
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type injector struct {
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valueInjectors []valueInjector
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}
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func (i injector) Inject(header http.Header, session *sessionsapi.SessionState) {
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for _, injector := range i.valueInjectors {
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injector.inject(header, session)
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}
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}
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func NewInjector(headers []options.Header) (Injector, error) {
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injectors := []valueInjector{}
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for _, header := range headers {
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for _, value := range header.Values {
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injector, err := newValueinjector(header.Name, value)
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if err != nil {
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return nil, fmt.Errorf("error building injector for header %q: %v", header.Name, err)
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}
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injectors = append(injectors, injector)
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}
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}
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return &injector{valueInjectors: injectors}, nil
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}
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type valueInjector interface {
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inject(http.Header, *sessionsapi.SessionState)
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}
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func newValueinjector(name string, value options.HeaderValue) (valueInjector, error) {
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switch {
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case value.SecretSource != nil && value.ClaimSource == nil:
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return newSecretInjector(name, value.SecretSource)
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case value.SecretSource == nil && value.ClaimSource != nil:
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return newClaimInjector(name, value.ClaimSource)
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default:
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return nil, fmt.Errorf("header %q value has multiple entries: only one entry per value is allowed", name)
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}
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}
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type injectorFunc struct {
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injectFunc func(http.Header, *sessionsapi.SessionState)
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}
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func (i *injectorFunc) inject(header http.Header, session *sessionsapi.SessionState) {
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i.injectFunc(header, session)
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}
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func newInjectorFunc(injectFunc func(header http.Header, session *sessionsapi.SessionState)) valueInjector {
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return &injectorFunc{injectFunc: injectFunc}
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}
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func newSecretInjector(name string, source *options.SecretSource) (valueInjector, error) {
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value, err := util.GetSecretValue(source)
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if err != nil {
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return nil, fmt.Errorf("error getting secret value: %v", err)
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}
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return newInjectorFunc(func(header http.Header, session *sessionsapi.SessionState) {
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header.Add(name, string(value))
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}), nil
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}
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func newClaimInjector(name string, source *options.ClaimSource) (valueInjector, error) {
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switch {
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case source.BasicAuthPassword != nil:
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password, err := util.GetSecretValue(source.BasicAuthPassword)
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if err != nil {
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return nil, fmt.Errorf("error loading basicAuthPassword: %v", err)
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}
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return newInjectorFunc(func(header http.Header, session *sessionsapi.SessionState) {
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claim := session.GetClaim(source.Claim)
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if claim == "" {
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return
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}
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auth := claim + ":" + string(password)
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header.Add(name, "Basic "+base64.StdEncoding.EncodeToString([]byte(auth)))
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}), nil
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case source.Prefix != "":
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return newInjectorFunc(func(header http.Header, session *sessionsapi.SessionState) {
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claim := session.GetClaim(source.Claim)
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if claim == "" {
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return
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}
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header.Add(name, source.Prefix+claim)
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}), nil
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default:
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return newInjectorFunc(func(header http.Header, session *sessionsapi.SessionState) {
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claim := session.GetClaim(source.Claim)
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if claim == "" {
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return
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}
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header.Add(name, claim)
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}), nil
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}
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}
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