Begin implementing SFTP server code

api/api.go

@@ -24,6 +24,12 @@ type PanelRequest struct {
 	Response *http.Response
 }
 
+func IsRequestError (err error) bool {
+	_, ok := err.(*PanelRequest)
+
+	return ok
+}
+
 // Builds the base request instance that can be used with the HTTP client.
 func (r *PanelRequest) GetClient() *http.Client {
 	return &http.Client{Timeout: time.Second * 30}
@@ -60,6 +66,21 @@ func (r *PanelRequest) Get(url string) (*http.Response, error) {
 	return c.Do(req)
 }
 
+func (r *PanelRequest) Post(url string, data []byte) (*http.Response, error) {
+	c := r.GetClient()
+
+	req, err := http.NewRequest(http.MethodPost, r.GetEndpoint(url), bytes.NewBuffer(data))
+	req = r.SetHeaders(req)
+
+	if err != nil {
+		return nil, err
+	}
+
+	zap.S().Debugw("POST request to endpoint", zap.String("endpoint", r.GetEndpoint(url)), zap.Any("headers", req.Header))
+
+	return c.Do(req)
+}
+
 // Determines if the API call encountered an error. If no request has been made
 // the response will be false.
 func (r *PanelRequest) HasError() bool {
@@ -67,7 +88,7 @@ func (r *PanelRequest) HasError() bool {
 		return false
 	}
 
-	return r.Response.StatusCode >= 300 || r.Response.StatusCode < 200;
+	return r.Response.StatusCode >= 300 || r.Response.StatusCode < 200
 }
 
 // Reads the body from the response and returns it, then replaces it on the response
@@ -86,29 +107,38 @@ func (r *PanelRequest) ReadBody() ([]byte, error) {
 
 	return b, nil
 }
+
+func (r *PanelRequest) HttpResponseCode() int {
+	if r.Response == nil {
+		return 0
+	}
+
+	return r.Response.StatusCode
+}
+
 // Returns the error message from the API call as a string. The error message will be formatted
 // similar to the below example:
 //
 // HttpNotFoundException: The requested resource does not exist. (HTTP/404)
-func (r *PanelRequest) Error() (string, error) {
+func (r *PanelRequest) Error() string {
 	body, err := r.ReadBody()
 	if err != nil {
-		return "", err
+		return err.Error()
 	}
 
 	zap.S().Debugw("got body", zap.ByteString("b", body))
 	_, valueType, _, err := jsonparser.Get(body, "errors")
 	if err != nil {
-		return "", err
+		return err.Error()
 	}
 
 	if valueType != jsonparser.Object {
-		return "no error object present on response", nil
+		return "no error object present on response"
 	}
 
 	code, _ := jsonparser.GetString(body, "errors.0.code")
 	status, _ := jsonparser.GetString(body, "errors.0.status")
 	detail, _ := jsonparser.GetString(body, "errors.0.detail")
 
-	return fmt.Sprintf("%s: %s (HTTP/%s)", code, detail, status), nil
+	return fmt.Sprintf("%s: %s (HTTP/%s)", code, detail, status)
 }

api/server_endpoints.go

@@ -3,6 +3,7 @@ package api
 import (
 	"encoding/json"
 	"fmt"
+	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/parser"
 	"go.uber.org/zap"
 )
@@ -39,10 +40,9 @@ func (r *PanelRequest) GetServerConfiguration(uuid string) (*ServerConfiguration
 	r.Response = resp
 
 	if r.HasError() {
-		e, err := r.Error()
-		zap.S().Warnw("got error", zap.String("message", e), zap.Error(err))
+		zap.S().Warnw("got error", zap.String("message", r.Error()))
 
-		return nil, err
+		return nil, errors.WithStack(errors.New(r.Error()))
 	}
 
 	res := &ServerConfiguration{}

api/sftp_endpoints.go

@@ -0,0 +1,39 @@
+package api
+
+import (
+	"encoding/json"
+	"github.com/pkg/errors"
+	"github.com/pterodactyl/sftp-server"
+)
+
+func (r *PanelRequest) ValidateSftpCredentials(request sftp_server.AuthenticationRequest) (*sftp_server.AuthenticationResponse, error) {
+	b, err := json.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := r.Post("/sftp/auth/login", b)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	r.Response = resp
+
+	if r.HasError() {
+		if r.HttpResponseCode() == 403 {
+			return nil, sftp_server.InvalidCredentialsError{}
+		}
+
+		return nil, errors.WithStack(errors.New(r.Error()))
+	}
+
+	response := new(sftp_server.AuthenticationResponse)
+	body, _ := r.ReadBody()
+
+	if err := json.Unmarshal(body, response); err != nil {
+		return nil, err
+	}
+
+	return response, nil
+}