Bound provider error response body reads

internal/llm/provider_http_error.go

@@ -81,6 +81,22 @@ func newProviderHTTPError(statusCode int, details providerErrorDetails) *Provide
 	}
 }
 
+func providerHTTPErrorFromBody(statusCode int, contentLength int64, body io.Reader) *ProviderHTTPError {
+	if contentLength > maxProviderErrorResponseBytes {
+		return newProviderHTTPError(statusCode, providerErrorDetails{})
+	}
+
+	limited := &io.LimitedReader{
+		R: body,
+		N: maxProviderErrorResponseBytes + 1,
+	}
+	contents, err := io.ReadAll(limited)
+	if err != nil || limited.N == 0 {
+		return newProviderHTTPError(statusCode, providerErrorDetails{})
+	}
+	return newProviderHTTPError(statusCode, parseProviderErrorEnvelope(contents))
+}
+
 func parseProviderErrorEnvelope(body []byte) providerErrorDetails {
 	decoder := json.NewDecoder(strings.NewReader(string(body)))
 	decoder.UseNumber()