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Auth Client Wrapper

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This commit is contained in:
Ben Toogood
2020-04-29 15:11:06 +01:00
parent 9d2fdb84be
commit 99f8be5b3d
5 changed files with 145 additions and 132 deletions
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175
util/wrapper/wrapper.go
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@@ -3,6 +3,7 @@ package wrapper
import (
"context"
"strings"
"time"
"github.com/micro/go-micro/v2/auth"
"github.com/micro/go-micro/v2/client"
@@ -11,68 +12,44 @@ import (
"github.com/micro/go-micro/v2/errors"
"github.com/micro/go-micro/v2/metadata"
"github.com/micro/go-micro/v2/server"
"github.com/micro/go-micro/v2/util/config"
)
type clientWrapper struct {
type fromServiceWrapper struct {
client.Client
// Auth interface
auth func() auth.Auth
// headers to inject
headers metadata.Metadata
}
type traceWrapper struct {
client.Client
name string
trace trace.Tracer
}
var (
HeaderPrefix = "Micro-"
)
func (c *clientWrapper) setHeaders(ctx context.Context) context.Context {
func (f *fromServiceWrapper) setHeaders(ctx context.Context) context.Context {
// don't overwrite keys
return metadata.MergeContext(ctx, c.headers, false)
return metadata.MergeContext(ctx, f.headers, false)
}
func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
ctx = c.setHeaders(ctx)
return c.Client.Call(ctx, req, rsp, opts...)
func (f *fromServiceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
ctx = f.setHeaders(ctx)
return f.Client.Call(ctx, req, rsp, opts...)
}
func (c *clientWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
ctx = c.setHeaders(ctx)
return c.Client.Stream(ctx, req, opts...)
func (f *fromServiceWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
ctx = f.setHeaders(ctx)
return f.Client.Stream(ctx, req, opts...)
}
func (c *clientWrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
ctx = c.setHeaders(ctx)
return c.Client.Publish(ctx, p, opts...)
}
func (c *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
newCtx, s := c.trace.Start(ctx, req.Service()+"."+req.Endpoint())
s.Type = trace.SpanTypeRequestOutbound
err := c.Client.Call(newCtx, req, rsp, opts...)
if err != nil {
s.Metadata["error"] = err.Error()
}
// finish the trace
c.trace.Finish(s)
return err
func (f *fromServiceWrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
ctx = f.setHeaders(ctx)
return f.Client.Publish(ctx, p, opts...)
}
// FromService wraps a client to inject service and auth metadata
func FromService(name string, c client.Client, fn func() auth.Auth) client.Client {
return &clientWrapper{
func FromService(name string, c client.Client) client.Client {
return &fromServiceWrapper{
c,
fn,
metadata.Metadata{
HeaderPrefix + "From-Service": name,
},
@@ -95,6 +72,28 @@ func HandlerStats(stats stats.Stats) server.HandlerWrapper {
}
}
type traceWrapper struct {
client.Client
name string
trace trace.Tracer
}
func (c *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
newCtx, s := c.trace.Start(ctx, req.Service()+"."+req.Endpoint())
s.Type = trace.SpanTypeRequestOutbound
err := c.Client.Call(newCtx, req, rsp, opts...)
if err != nil {
s.Metadata["error"] = err.Error()
}
// finish the trace
c.trace.Finish(s)
return err
}
// TraceCall is a call tracing wrapper
func TraceCall(name string, t trace.Tracer, c client.Client) client.Client {
return &traceWrapper{
@@ -132,6 +131,104 @@ func TraceHandler(t trace.Tracer) server.HandlerWrapper {
}
}
type authWrapper struct {
client.Client
name string
auth func() auth.Auth
}
func (a *authWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
// parse the options
var options client.CallOptions
for _, o := range opts {
o(&options)
}
// check to see if the authorization header has already been set.
// We dont't override the header unless the ServiceToken option has
// been specified.
if _, ok := metadata.Get(ctx, "Authorization"); ok && !options.ServiceToken {
return a.Client.Call(ctx, req, rsp, opts...)
}
// if auth is nil we won't be able to get an access token, so we execute
// the request without one.
aa := a.auth()
if a == nil {
return a.Client.Call(ctx, req, rsp, opts...)
}
// callWithToken performs the client call with the authorization header
// set to the token.
callWithToken := func(token string) error {
ctx := metadata.Set(ctx, "Authorization", auth.BearerScheme+token)
return a.Client.Call(ctx, req, rsp, opts...)
}
// check to see if we have a valid access token
aaOpts := aa.Options()
if aaOpts.Token != nil && aaOpts.Token.Expiry.Unix() > time.Now().Unix() {
return callWithToken(aaOpts.Token.AccessToken)
}
// if we have a refresh token we can use this to generate another access token
if aaOpts.Token != nil {
tok, err := aa.Token(auth.WithToken(aaOpts.Token.RefreshToken))
if err != nil {
return err
}
aa.Init(auth.ClientToken(tok))
return callWithToken(tok.AccessToken)
}
// if we have credentials we can generate a new token for the exiting auth
// account. these credential would've been set by env vars.
if len(aaOpts.ID) > 0 && len(aaOpts.Secret) > 0 {
tok, err := aa.Token(auth.WithCredentials(aaOpts.ID, aaOpts.Secret))
if err != nil {
return err
}
aa.Init(auth.ClientToken(tok))
return callWithToken(tok.AccessToken)
}
// before we generate a new auth account, check to see if a token was provided
// in config, this is normally used for setting the token when calling via the cli
if token, err := config.Get("micro", "auth", "token"); err == nil && len(token) > 0 {
return callWithToken(token)
}
// determine the type of service from the name. we do this so we can allocate
// different roles depending on the type of services. e.g. we don't want web
// services talking directly to the runtime. TODO: find a better way to determine
// the type of service
serviceType := "service"
if strings.Contains(a.name, "api") {
serviceType = "api"
} else if strings.Contains(a.name, "web") {
serviceType = "web"
}
// generate a new auth account for the service
acc, err := aa.Generate(a.name, auth.WithNamespace(aaOpts.Namespace), auth.WithRoles(serviceType))
if err != nil {
return err
}
token, err := aa.Token(auth.WithCredentials(acc.ID, acc.Secret))
if err != nil {
return err
}
aa.Init(auth.ClientToken(token))
// use the token to execute the request
return callWithToken(token.AccessToken)
}
// AuthClient wraps requests with the auth header
func AuthClient(name string, auth func() auth.Auth, c client.Client) client.Client {
return &authWrapper{c, name, auth}
}
// AuthHandler wraps a server handler to perform auth
func AuthHandler(fn func() auth.Auth) server.HandlerWrapper {
return func(h server.HandlerFunc) server.HandlerFunc {