feat: backend core - auth, user, role, permission, device, webhook, monitoring, cache, repository, service, middleware, API handlers

internal/auth/providers/http.go

@@ -0,0 +1,43 @@
+package providers
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+const maxOAuthResponseBodyBytes = 1 << 20
+
+func postFormWithContext(ctx context.Context, client *http.Client, endpoint string, data url.Values) (*http.Response, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, strings.NewReader(data.Encode()))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	return client.Do(req)
+}
+
+func readOAuthResponseBody(resp *http.Response) ([]byte, error) {
+	limited := io.LimitReader(resp.Body, maxOAuthResponseBodyBytes+1)
+	body, err := io.ReadAll(limited)
+	if err != nil {
+		return nil, err
+	}
+	if len(body) > maxOAuthResponseBodyBytes {
+		return nil, fmt.Errorf("oauth response body exceeded %d bytes", maxOAuthResponseBodyBytes)
+	}
+	if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+		snippet := strings.TrimSpace(string(body))
+		if len(snippet) > 256 {
+			snippet = snippet[:256]
+		}
+		if snippet == "" {
+			return nil, fmt.Errorf("oauth request failed with status %d", resp.StatusCode)
+		}
+		return nil, fmt.Errorf("oauth request failed with status %d: %s", resp.StatusCode, snippet)
+	}
+	return body, nil
+}