traefik/pkg/provider/rest/rest.go

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package rest
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/log"
"github.com/containous/traefik/v2/pkg/provider"
"github.com/containous/traefik/v2/pkg/safe"
"github.com/gorilla/mux"
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"github.com/unrolled/render"
)
var _ provider.Provider = (*Provider)(nil)
// Provider is a provider.Provider implementation that provides a Rest API.
type Provider struct {
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Insecure bool `description:"Activate REST Provider directly on the entryPoint named traefik." json:"insecure,omitempty" toml:"insecure,omitempty" yaml:"insecure,omitempty" export:"true"`
configurationChan chan<- dynamic.Message
}
// SetDefaults sets the default values.
func (p *Provider) SetDefaults() {
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}
var templatesRenderer = render.New(render.Options{Directory: "nowhere"})
// Init the provider.
func (p *Provider) Init() error {
return nil
}
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// Handler creates an http.Handler for the Rest API
func (p *Provider) Handler() http.Handler {
router := mux.NewRouter()
p.Append(router)
return router
}
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// Append add rest provider routes on a router.
func (p *Provider) Append(systemRouter *mux.Router) {
systemRouter.
Methods(http.MethodPut).
Path("/api/providers/{provider}").
HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
if vars["provider"] != "rest" {
response.WriteHeader(http.StatusBadRequest)
fmt.Fprint(response, "Only 'rest' provider can be updated through the REST API")
return
}
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configuration := new(dynamic.Configuration)
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body, _ := ioutil.ReadAll(request.Body)
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if err := json.Unmarshal(body, configuration); err != nil {
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log.WithoutContext().Errorf("Error parsing configuration %+v", err)
http.Error(response, fmt.Sprintf("%+v", err), http.StatusBadRequest)
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return
}
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p.configurationChan <- dynamic.Message{ProviderName: "rest", Configuration: configuration}
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if err := templatesRenderer.JSON(response, http.StatusOK, configuration); err != nil {
log.WithoutContext().Error(err)
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}
})
}
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
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p.configurationChan = configurationChan
return nil
}