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gke_capabilities.go
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/
gke_capabilities.go
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package capabilities
import (
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strings"
"github.com/rancher/kontainer-engine/drivers/gke"
"github.com/sirupsen/logrus"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/compute/v1"
"google.golang.org/api/container/v1"
"google.golang.org/api/iam/v1"
)
type capabilitiesRequestBody struct {
Credentials string `json:"credentials,omitempty"`
ProjectID string `json:"projectId,omitempty"`
Zone string `json:"zone,omitempty"`
Region string `json:"region,omitempty"`
}
func validateCapabilitiesRequestBody(writer http.ResponseWriter, body *capabilitiesRequestBody) error {
credentials := body.Credentials
projectID := body.ProjectID
if projectID == "" {
writer.WriteHeader(http.StatusBadRequest)
return fmt.Errorf("invalid projectId")
}
if credentials == "" {
writer.WriteHeader(http.StatusBadRequest)
return fmt.Errorf("invalid credentials")
}
return nil
}
func getOAuthClient(ctx context.Context, credentialContent string) (*http.Client, error) {
// The google SDK has no sane way to pass in a TokenSource give all the different types (user, service account, etc)
// So we actually set an environment variable and then unset it
gke.EnvMutex.Lock()
locked := true
setEnv := false
cleanup := func() {
if setEnv {
os.Unsetenv(defaultCredentialEnv)
}
if locked {
gke.EnvMutex.Unlock()
locked = false
}
}
defer cleanup()
file, err := ioutil.TempFile("", "credential-file")
if err != nil {
return nil, err
}
defer os.Remove(file.Name())
defer file.Close()
if _, err := io.Copy(file, strings.NewReader(credentialContent)); err != nil {
return nil, err
}
setEnv = true
os.Setenv(defaultCredentialEnv, file.Name())
ts, err := google.DefaultTokenSource(ctx, container.CloudPlatformScope)
if err != nil {
return nil, err
}
// Unlocks
cleanup()
return oauth2.NewClient(ctx, ts), nil
}
func handleErr(writer http.ResponseWriter, originalErr error) {
resp := errorResponse{originalErr.Error()}
asJSON, err := json.Marshal(resp)
if err != nil {
logrus.Error("error while marshalling error message '" + originalErr.Error() + "' error was '" + err.Error() + "'")
writer.Write([]byte(err.Error()))
return
}
writer.Write([]byte(asJSON))
}
func preCheck(writer http.ResponseWriter, req *http.Request) *capabilitiesRequestBody {
if req.Method != http.MethodPost {
writer.WriteHeader(http.StatusMethodNotAllowed)
return nil
}
writer.Header().Set("Content-Type", "application/json")
var body capabilitiesRequestBody
err := extractRequestBody(writer, req, &body)
if err != nil {
handleErr(writer, err)
return nil
}
err = validateCapabilitiesRequestBody(writer, &body)
if err != nil {
handleErr(writer, err)
return nil
}
return &body
}
func postCheck(writer http.ResponseWriter, result interface{}, err error) {
if err != nil {
writer.WriteHeader(http.StatusInternalServerError)
handleErr(writer, err)
return
}
serialized, err := json.Marshal(&result)
if err != nil {
writer.WriteHeader(http.StatusInternalServerError)
handleErr(writer, err)
return
}
writer.Write(serialized)
}
func getComputeServiceClient(ctx context.Context, credentialContent string) (*compute.Service, error) {
client, err := getOAuthClient(ctx, credentialContent)
if err != nil {
return nil, err
}
service, err := compute.New(client)
if err != nil {
return nil, err
}
return service, nil
}
func getIamServiceClient(ctx context.Context, credentialContent string) (*iam.Service, error) {
client, err := getOAuthClient(ctx, credentialContent)
if err != nil {
return nil, err
}
service, err := iam.New(client)
if err != nil {
return nil, err
}
return service, nil
}
func getContainerServiceClient(ctx context.Context, credentialContent string) (*container.Service, error) {
client, err := getOAuthClient(ctx, credentialContent)
if err != nil {
return nil, err
}
service, err := container.New(client)
if err != nil {
return nil, err
}
return service, nil
}