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|
package authenticatedwrapper
import (
"strings"
"github.com/docker/swarmkit/protobuf/plugin"
"github.com/gogo/protobuf/proto"
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"github.com/gogo/protobuf/protoc-gen-gogo/generator"
)
type authenticatedWrapperGen struct {
gen *generator.Generator
}
func init() {
generator.RegisterPlugin(new(authenticatedWrapperGen))
}
func (g *authenticatedWrapperGen) Init(gen *generator.Generator) {
g.gen = gen
}
func (g *authenticatedWrapperGen) Name() string {
return "authenticatedwrapper"
}
func (g *authenticatedWrapperGen) genAuthenticatedStruct(s *descriptor.ServiceDescriptorProto) {
g.gen.P("type " + serviceTypeName(s) + " struct {")
g.gen.P(" local " + s.GetName() + "Server")
g.gen.P(" authorize func(context.Context, []string) error")
g.gen.P("}")
}
func (g *authenticatedWrapperGen) genAuthenticatedConstructor(s *descriptor.ServiceDescriptorProto) {
g.gen.P("func NewAuthenticatedWrapper" + s.GetName() + "Server(local " + s.GetName() + "Server, authorize func(context.Context, []string) error)" + s.GetName() + "Server {")
g.gen.P("return &" + serviceTypeName(s) + `{
local: local,
authorize: authorize,
}`)
g.gen.P("}")
}
func getInputTypeName(m *descriptor.MethodDescriptorProto) string {
parts := strings.Split(m.GetInputType(), ".")
return parts[len(parts)-1]
}
func getOutputTypeName(m *descriptor.MethodDescriptorProto) string {
parts := strings.Split(m.GetOutputType(), ".")
return parts[len(parts)-1]
}
func serviceTypeName(s *descriptor.ServiceDescriptorProto) string {
return "authenticatedWrapper" + s.GetName() + "Server"
}
func sigPrefix(s *descriptor.ServiceDescriptorProto, m *descriptor.MethodDescriptorProto) string {
return "func (p *" + serviceTypeName(s) + ") " + m.GetName() + "("
}
func genRoles(auth *plugin.TLSAuthorization) string {
rolesSlice := "[]string{"
first := true
for _, role := range auth.Roles {
if !first {
rolesSlice += ","
}
first = false
rolesSlice += `"` + role + `"`
}
rolesSlice += "}"
return rolesSlice
}
func (g *authenticatedWrapperGen) genServerStreamingMethod(s *descriptor.ServiceDescriptorProto, m *descriptor.MethodDescriptorProto) {
g.gen.P(sigPrefix(s, m) + "r *" + getInputTypeName(m) + ", stream " + s.GetName() + "_" + m.GetName() + "Server) error {")
authIntf, err := proto.GetExtension(m.Options, plugin.E_TlsAuthorization)
if err != nil {
g.gen.P(`
panic("no authorization information in protobuf")`)
g.gen.P(`}`)
return
}
auth := authIntf.(*plugin.TLSAuthorization)
if auth.Insecure != nil && *auth.Insecure {
if len(auth.Roles) != 0 {
panic("Roles and Insecure cannot both be specified")
}
g.gen.P(`
return p.local.` + m.GetName() + `(r, stream)`)
g.gen.P(`}`)
return
}
g.gen.P(`
if err := p.authorize(stream.Context(),` + genRoles(auth) + `); err != nil {
return err
}
return p.local.` + m.GetName() + `(r, stream)`)
g.gen.P("}")
}
func (g *authenticatedWrapperGen) genClientServerStreamingMethod(s *descriptor.ServiceDescriptorProto, m *descriptor.MethodDescriptorProto) {
g.gen.P(sigPrefix(s, m) + "stream " + s.GetName() + "_" + m.GetName() + "Server) error {")
authIntf, err := proto.GetExtension(m.Options, plugin.E_TlsAuthorization)
if err != nil {
g.gen.P(`
panic("no authorization information in protobuf")`)
g.gen.P(`}`)
return
}
auth := authIntf.(*plugin.TLSAuthorization)
if auth.Insecure != nil && *auth.Insecure {
if len(auth.Roles) != 0 {
panic("Roles and Insecure cannot both be specified")
}
g.gen.P(`
return p.local.` + m.GetName() + `(stream)`)
g.gen.P(`}`)
return
}
g.gen.P(`
if err := p.authorize(stream.Context(), ` + genRoles(auth) + `); err != nil {
return err
}
return p.local.` + m.GetName() + `(stream)`)
g.gen.P("}")
}
func (g *authenticatedWrapperGen) genSimpleMethod(s *descriptor.ServiceDescriptorProto, m *descriptor.MethodDescriptorProto) {
g.gen.P(sigPrefix(s, m) + "ctx context.Context, r *" + getInputTypeName(m) + ") (*" + getOutputTypeName(m) + ", error) {")
authIntf, err := proto.GetExtension(m.Options, plugin.E_TlsAuthorization)
if err != nil {
g.gen.P(`
panic("no authorization information in protobuf")`)
g.gen.P(`}`)
return
}
auth := authIntf.(*plugin.TLSAuthorization)
if auth.Insecure != nil && *auth.Insecure {
if len(auth.Roles) != 0 {
panic("Roles and Insecure cannot both be specified")
}
g.gen.P(`
return p.local.` + m.GetName() + `(ctx, r)`)
g.gen.P(`}`)
return
}
g.gen.P(`
if err := p.authorize(ctx, ` + genRoles(auth) + `); err != nil {
return nil, err
}
return p.local.` + m.GetName() + `(ctx, r)`)
g.gen.P("}")
}
func (g *authenticatedWrapperGen) genAuthenticatedMethod(s *descriptor.ServiceDescriptorProto, m *descriptor.MethodDescriptorProto) {
g.gen.P()
switch {
case m.GetClientStreaming():
g.genClientServerStreamingMethod(s, m)
case m.GetServerStreaming():
g.genServerStreamingMethod(s, m)
default:
g.genSimpleMethod(s, m)
}
g.gen.P()
}
func (g *authenticatedWrapperGen) Generate(file *generator.FileDescriptor) {
g.gen.P()
for _, s := range file.Service {
g.genAuthenticatedStruct(s)
g.genAuthenticatedConstructor(s)
for _, m := range s.Method {
g.genAuthenticatedMethod(s, m)
}
}
g.gen.P()
}
func (g *authenticatedWrapperGen) GenerateImports(file *generator.FileDescriptor) {
}
|
