traefik/web.go

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package main
import (
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"encoding/json"
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"fmt"
"io/ioutil"
"net/http"
log "github.com/Sirupsen/logrus"
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"github.com/elazarl/go-bindata-assetfs"
"github.com/emilevauge/traefik/autogen"
"github.com/emilevauge/traefik/types"
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"github.com/gorilla/mux"
"github.com/unrolled/render"
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)
// WebProvider is a provider.Provider implementation that provides the UI.
// FIXME to be handled another way.
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type WebProvider struct {
Address string
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CertFile, KeyFile string
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ReadOnly bool
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}
var (
templatesRenderer = render.New(render.Options{
Directory: "nowhere",
})
)
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *WebProvider) Provide(configurationChan chan<- types.ConfigMessage) error {
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systemRouter := mux.NewRouter()
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// health route
systemRouter.Methods("GET").Path("/health").HandlerFunc(getHealthHandler)
// API routes
systemRouter.Methods("GET").Path("/api").HandlerFunc(getConfigHandler)
systemRouter.Methods("GET").Path("/api/providers").HandlerFunc(getConfigHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}").HandlerFunc(getProviderHandler)
systemRouter.Methods("PUT").Path("/api/providers/{provider}").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
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if provider.ReadOnly {
response.WriteHeader(http.StatusForbidden)
fmt.Fprintf(response, "REST API is in read-only mode")
return
}
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vars := mux.Vars(request)
if vars["provider"] != "web" {
response.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(response, "Only 'web' provider can be updated through the REST API")
return
}
configuration := new(types.Configuration)
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body, _ := ioutil.ReadAll(request.Body)
err := json.Unmarshal(body, configuration)
if err == nil {
configurationChan <- types.ConfigMessage{"web", configuration}
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getConfigHandler(response, request)
} else {
log.Errorf("Error parsing configuration %+v", err)
http.Error(response, fmt.Sprintf("%+v", err), http.StatusBadRequest)
}
})
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends").HandlerFunc(getBackendsHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends/{backend}").HandlerFunc(getBackendHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends/{backend}/servers").HandlerFunc(getServersHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends/{backend}/servers/{server}").HandlerFunc(getServerHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends").HandlerFunc(getFrontendsHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends/{frontend}").HandlerFunc(getFrontendHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends/{frontend}/routes").HandlerFunc(getRoutesHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends/{frontend}/routes/{route}").HandlerFunc(getRouteHandler)
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// Expose dashboard
systemRouter.Methods("GET").Path("/").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
http.Redirect(response, request, "/dashboard/", 302)
})
systemRouter.Methods("GET").PathPrefix("/dashboard/").Handler(http.StripPrefix("/dashboard/", http.FileServer(&assetfs.AssetFS{Asset: autogen.Asset, AssetDir: autogen.AssetDir, Prefix: "static"})))
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go func() {
if len(provider.CertFile) > 0 && len(provider.KeyFile) > 0 {
err := http.ListenAndServeTLS(provider.Address, provider.CertFile, provider.KeyFile, systemRouter)
if err != nil {
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log.Fatal("Error creating server: ", err)
}
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} else {
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err := http.ListenAndServe(provider.Address, systemRouter)
if err != nil {
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log.Fatal("Error creating server: ", err)
}
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}
}()
return nil
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}
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func getHealthHandler(response http.ResponseWriter, request *http.Request) {
templatesRenderer.JSON(response, http.StatusOK, metrics.Data())
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}
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func getConfigHandler(response http.ResponseWriter, request *http.Request) {
templatesRenderer.JSON(response, http.StatusOK, currentConfigurations)
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}
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func getProviderHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
if provider, ok := currentConfigurations[providerID]; ok {
templatesRenderer.JSON(response, http.StatusOK, provider)
} else {
http.NotFound(response, request)
}
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}
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func getBackendsHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
if provider, ok := currentConfigurations[providerID]; ok {
templatesRenderer.JSON(response, http.StatusOK, provider.Backends)
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} else {
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http.NotFound(response, request)
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}
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}
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func getBackendHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
backendID := vars["backend"]
if provider, ok := currentConfigurations[providerID]; ok {
if backend, ok := provider.Backends[backendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, backend)
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return
}
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}
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http.NotFound(response, request)
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}
func getServersHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
backendID := vars["backend"]
if provider, ok := currentConfigurations[providerID]; ok {
if backend, ok := provider.Backends[backendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, backend.Servers)
return
}
}
http.NotFound(response, request)
}
func getServerHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
backendID := vars["backend"]
serverID := vars["server"]
if provider, ok := currentConfigurations[providerID]; ok {
if backend, ok := provider.Backends[backendID]; ok {
if server, ok := backend.Servers[serverID]; ok {
templatesRenderer.JSON(response, http.StatusOK, server)
return
}
}
}
http.NotFound(response, request)
}
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func getFrontendsHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
if provider, ok := currentConfigurations[providerID]; ok {
templatesRenderer.JSON(response, http.StatusOK, provider.Frontends)
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} else {
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http.NotFound(response, request)
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}
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}
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func getFrontendHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
frontendID := vars["frontend"]
if provider, ok := currentConfigurations[providerID]; ok {
if frontend, ok := provider.Frontends[frontendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, frontend)
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return
}
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}
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http.NotFound(response, request)
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}
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func getRoutesHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
providerID := vars["provider"]
frontendID := vars["frontend"]
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if provider, ok := currentConfigurations[providerID]; ok {
if frontend, ok := provider.Frontends[frontendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, frontend.Routes)
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return
}
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}
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http.NotFound(response, request)
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}
func getRouteHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
providerID := vars["provider"]
frontendID := vars["frontend"]
routeID := vars["route"]
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if provider, ok := currentConfigurations[providerID]; ok {
if frontend, ok := provider.Frontends[frontendID]; ok {
if route, ok := frontend.Routes[routeID]; ok {
templatesRenderer.JSON(response, http.StatusOK, route)
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return
}
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}
}
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http.NotFound(response, request)
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}