Moved to google.golang.org/genproto/googleapis/api/annotations

Fixes #52

vendor/github.com/go-kit/kit/auth/jwt/README.md

@@ -0,0 +1,122 @@
+# package auth/jwt
+
+`package auth/jwt` provides a set of interfaces for service authorization
+through [JSON Web Tokens](https://jwt.io/).
+
+## Usage
+
+NewParser takes a key function and an expected signing method and returns an
+`endpoint.Middleware`. The middleware will parse a token passed into the
+context via the `jwt.JWTTokenContextKey`. If the token is valid, any claims
+will be added to the context via the `jwt.JWTClaimsContextKey`.
+
+```go
+import (
+	stdjwt "github.com/dgrijalva/jwt-go"
+	
+	"github.com/go-kit/kit/auth/jwt"
+	"github.com/go-kit/kit/endpoint"
+)
+
+func main() {
+	var exampleEndpoint endpoint.Endpoint
+	{
+		kf := func(token *stdjwt.Token) (interface{}, error) { return []byte("SigningString"), nil }
+		exampleEndpoint = MakeExampleEndpoint(service)
+		exampleEndpoint = jwt.NewParser(kf, stdjwt.SigningMethodHS256)(exampleEndpoint)
+	}
+}
+```
+
+NewSigner takes a JWT key ID header, the signing key, signing method, and a
+claims object. It returns an `endpoint.Middleware`. The middleware will build
+the token string and add it to the context via the `jwt.JWTTokenContextKey`.
+
+```go
+import (
+	stdjwt "github.com/dgrijalva/jwt-go"
+	
+	"github.com/go-kit/kit/auth/jwt"
+	"github.com/go-kit/kit/endpoint"
+)
+
+func main() {
+	var exampleEndpoint endpoint.Endpoint
+	{
+		exampleEndpoint = grpctransport.NewClient(...).Endpoint()
+		exampleEndpoint = jwt.NewSigner(
+			"kid-header", 
+			[]byte("SigningString"), 
+			stdjwt.SigningMethodHS256, 
+			jwt.Claims{},
+		)(exampleEndpoint)
+	}
+}
+```
+
+In order for the parser and the signer to work, the authorization headers need
+to be passed between the request and the context. `ToHTTPContext()`,
+`FromHTTPContext()`, `ToGRPCContext()`, and `FromGRPCContext()` are given as
+helpers to do this. These functions implement the correlating transport's
+RequestFunc interface and can be passed as ClientBefore or ServerBefore
+options.
+
+Example of use in a client:
+
+```go
+import (
+	stdjwt "github.com/dgrijalva/jwt-go"
+
+	grpctransport "github.com/go-kit/kit/transport/grpc"	
+	"github.com/go-kit/kit/auth/jwt"
+	"github.com/go-kit/kit/endpoint"
+)
+
+func main() {
+
+	options := []httptransport.ClientOption{}
+	var exampleEndpoint endpoint.Endpoint
+	{
+		exampleEndpoint = grpctransport.NewClient(..., grpctransport.ClientBefore(jwt.FromGRPCContext())).Endpoint()
+		exampleEndpoint = jwt.NewSigner(
+			"kid-header",
+			[]byte("SigningString"),
+			stdjwt.SigningMethodHS256,
+			jwt.Claims{},
+		)(exampleEndpoint)
+	}
+}
+```
+
+Example of use in a server:
+
+```go
+import (
+	"context"
+
+	"github.com/go-kit/kit/auth/jwt"
+	"github.com/go-kit/kit/log"
+	grpctransport "github.com/go-kit/kit/transport/grpc"
+)
+
+func MakeGRPCServer(ctx context.Context, endpoints Endpoints, logger log.Logger) pb.ExampleServer {
+	options := []grpctransport.ServerOption{grpctransport.ServerErrorLogger(logger)}
+
+	return &grpcServer{
+		createUser: grpctransport.NewServer(
+			ctx,
+			endpoints.CreateUserEndpoint,
+			DecodeGRPCCreateUserRequest,
+			EncodeGRPCCreateUserResponse,
+			append(options, grpctransport.ServerBefore(jwt.ToGRPCContext()))...,
+		),
+		getUser: grpctransport.NewServer(
+			ctx,
+			endpoints.GetUserEndpoint,
+			DecodeGRPCGetUserRequest,
+			EncodeGRPCGetUserResponse,
+			options...,
+		),
+	}
+}
+```