254 lines
7.1 KiB
Go
254 lines
7.1 KiB
Go
package wrapper
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import (
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"context"
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"strings"
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"time"
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"github.com/micro/go-micro/v2/auth"
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"github.com/micro/go-micro/v2/client"
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"github.com/micro/go-micro/v2/debug/stats"
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"github.com/micro/go-micro/v2/debug/trace"
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"github.com/micro/go-micro/v2/errors"
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"github.com/micro/go-micro/v2/metadata"
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"github.com/micro/go-micro/v2/server"
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"github.com/micro/go-micro/v2/util/config"
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)
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type fromServiceWrapper struct {
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client.Client
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// headers to inject
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headers metadata.Metadata
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}
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var (
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HeaderPrefix = "Micro-"
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)
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func (f *fromServiceWrapper) setHeaders(ctx context.Context) context.Context {
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// don't overwrite keys
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return metadata.MergeContext(ctx, f.headers, false)
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}
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func (f *fromServiceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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ctx = f.setHeaders(ctx)
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return f.Client.Call(ctx, req, rsp, opts...)
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}
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func (f *fromServiceWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
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ctx = f.setHeaders(ctx)
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return f.Client.Stream(ctx, req, opts...)
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}
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func (f *fromServiceWrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
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ctx = f.setHeaders(ctx)
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return f.Client.Publish(ctx, p, opts...)
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}
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// FromService wraps a client to inject service and auth metadata
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func FromService(name string, c client.Client) client.Client {
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return &fromServiceWrapper{
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c,
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metadata.Metadata{
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HeaderPrefix + "From-Service": name,
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},
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}
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}
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// HandlerStats wraps a server handler to generate request/error stats
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func HandlerStats(stats stats.Stats) server.HandlerWrapper {
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// return a handler wrapper
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return func(h server.HandlerFunc) server.HandlerFunc {
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// return a function that returns a function
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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// execute the handler
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err := h(ctx, req, rsp)
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// record the stats
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stats.Record(err)
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// return the error
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return err
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}
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}
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}
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type traceWrapper struct {
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client.Client
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name string
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trace trace.Tracer
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}
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func (c *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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newCtx, s := c.trace.Start(ctx, req.Service()+"."+req.Endpoint())
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s.Type = trace.SpanTypeRequestOutbound
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err := c.Client.Call(newCtx, req, rsp, opts...)
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if err != nil {
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s.Metadata["error"] = err.Error()
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}
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// finish the trace
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c.trace.Finish(s)
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return err
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}
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// TraceCall is a call tracing wrapper
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func TraceCall(name string, t trace.Tracer, c client.Client) client.Client {
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return &traceWrapper{
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name: name,
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trace: t,
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Client: c,
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}
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}
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// TraceHandler wraps a server handler to perform tracing
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func TraceHandler(t trace.Tracer) server.HandlerWrapper {
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// return a handler wrapper
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return func(h server.HandlerFunc) server.HandlerFunc {
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// return a function that returns a function
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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// don't store traces for debug
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if strings.HasPrefix(req.Endpoint(), "Debug.") {
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return h(ctx, req, rsp)
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}
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// get the span
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newCtx, s := t.Start(ctx, req.Service()+"."+req.Endpoint())
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s.Type = trace.SpanTypeRequestInbound
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err := h(newCtx, req, rsp)
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if err != nil {
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s.Metadata["error"] = err.Error()
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}
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// finish
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t.Finish(s)
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return err
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}
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}
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}
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type authWrapper struct {
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client.Client
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name string
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id string
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auth func() auth.Auth
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}
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func (a *authWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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// parse the options
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var options client.CallOptions
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for _, o := range opts {
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o(&options)
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}
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// check to see if the authorization header has already been set.
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// We dont't override the header unless the ServiceToken option has
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// been specified or the header wasn't provided
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if _, ok := metadata.Get(ctx, "Authorization"); ok && !options.ServiceToken {
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return a.Client.Call(ctx, req, rsp, opts...)
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}
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// if auth is nil we won't be able to get an access token, so we execute
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// the request without one.
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aa := a.auth()
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if a == nil {
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return a.Client.Call(ctx, req, rsp, opts...)
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}
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// performs the call with the authorization token provided
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callWithToken := func(token string) error {
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ctx := metadata.Set(ctx, "Authorization", auth.BearerScheme+token)
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return a.Client.Call(ctx, req, rsp, opts...)
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}
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// check to see if we have a valid access token
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aaOpts := aa.Options()
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if aaOpts.Token != nil && aaOpts.Token.Expiry.Unix() > time.Now().Unix() {
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return callWithToken(aaOpts.Token.AccessToken)
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}
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// if we have a refresh token we can use this to generate another access token
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if aaOpts.Token != nil {
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tok, err := aa.Token(auth.WithToken(aaOpts.Token.RefreshToken))
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if err != nil {
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return err
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}
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aa.Init(auth.ClientToken(tok))
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return callWithToken(tok.AccessToken)
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}
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// check to see if a token was provided in config, this is normally used for
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// setting the token when calling via the cli
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if token, err := config.Get("micro", "auth", "token"); err == nil && len(token) > 0 {
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return callWithToken(token)
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}
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// call without an auth token
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return a.Client.Call(ctx, req, rsp, opts...)
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}
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// AuthClient wraps requests with the auth header
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func AuthClient(name string, id string, auth func() auth.Auth, c client.Client) client.Client {
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return &authWrapper{c, name, id, auth}
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}
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// AuthHandler wraps a server handler to perform auth
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func AuthHandler(fn func() auth.Auth) server.HandlerWrapper {
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return func(h server.HandlerFunc) server.HandlerFunc {
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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// get the auth.Auth interface
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a := fn()
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// Check for debug endpoints which should be excluded from auth
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if strings.HasPrefix(req.Endpoint(), "Debug.") {
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return h(ctx, req, rsp)
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}
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// Extract the token if present. Note: if noop is being used
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// then the token can be blank without erroring
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var token string
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if header, ok := metadata.Get(ctx, "Authorization"); ok {
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// Ensure the correct scheme is being used
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if !strings.HasPrefix(header, auth.BearerScheme) {
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return errors.Unauthorized(req.Service(), "invalid authorization header. expected Bearer schema")
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}
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token = header[len(auth.BearerScheme):]
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}
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// Inspect the token and get the account
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account, err := a.Inspect(token)
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if err != nil {
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account = &auth.Account{Namespace: a.Options().Namespace}
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}
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// construct the resource
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res := &auth.Resource{
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Type: "service",
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Name: req.Service(),
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Endpoint: req.Endpoint(),
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}
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// Verify the caller has access to the resource
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err = a.Verify(account, res)
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if err != nil && len(account.ID) > 0 {
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return errors.Forbidden(req.Service(), "Forbidden call made to %v:%v by %v", req.Service(), req.Endpoint(), account.ID)
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} else if err != nil {
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return errors.Unauthorized(req.Service(), "Unauthorised call made to %v:%v", req.Service(), req.Endpoint())
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}
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// There is an account, set it in the context
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if len(account.ID) > 0 {
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ctx = auth.ContextWithAccount(ctx, account)
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}
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// The user is authorised, allow the call
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return h(ctx, req, rsp)
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}
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}
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}
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