initial commit

internal/permissions/client.go

@@ -0,0 +1,128 @@
+package permissions
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/labstack/echo/v4"
+	"go.uber.org/zap"
+)
+
+const defaultPermissionsURL = "https://permissions-api.hollow-a.sv15.metalkube.net"
+
+var defaultHTTPClient = &http.Client{
+	Timeout: 5 * time.Second,
+}
+
+type Client struct {
+	logger *zap.SugaredLogger
+
+	httpClient *http.Client
+	token      string
+
+	baseURL *url.URL
+
+	allowURL *url.URL
+}
+
+func (c *Client) Do(req *http.Request, out any) (*http.Response, error) {
+	if c.token != "" {
+		req.Header.Set(echo.HeaderAuthorization, "Bearer "+c.token)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	if out != nil {
+		defer resp.Body.Close()
+
+		if err := json.NewDecoder(resp.Body).Decode(out); err != nil {
+			return resp, err
+		}
+	}
+
+	return resp, nil
+}
+
+func (c *Client) DoRequest(ctx context.Context, method, path string, body io.Reader, out any) (*http.Response, error) {
+	path = strings.TrimPrefix(path, c.baseURL.Path)
+
+	pathURL, err := url.Parse(path)
+	if err != nil {
+		return nil, err
+	}
+
+	url := c.baseURL.JoinPath(pathURL.Path)
+
+	query := url.Query()
+
+	for k, v := range pathURL.Query() {
+		query[k] = v
+	}
+
+	url.RawQuery = query.Encode()
+
+	req, err := http.NewRequestWithContext(ctx, method, url.String(), body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to build request: %w", err)
+	}
+
+	resp, err := c.Do(req, out)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get response: %w", err)
+	}
+
+	if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+		return resp, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	return resp, nil
+}
+
+func encodeJSON(v any) (*bytes.Buffer, error) {
+	var buff bytes.Buffer
+
+	if err := json.NewEncoder(&buff).Encode(v); err != nil {
+		return nil, err
+	}
+
+	return &buff, nil
+}
+
+func NewClient(token string, options ...Option) (*Client, error) {
+	client := &Client{
+		logger:     zap.NewNop().Sugar(),
+		httpClient: defaultHTTPClient,
+		token:      token,
+	}
+
+	for _, opt := range options {
+		if err := opt(client); err != nil {
+			return nil, err
+		}
+	}
+
+	if client.baseURL == nil {
+		uri, err := url.Parse(defaultPermissionsURL)
+		if err != nil {
+			return nil, err
+		}
+
+		client.baseURL = uri
+	}
+
+	client.allowURL = client.baseURL.JoinPath("/api/v1/allow")
+
+	return client, nil
+}