fix(geo): import and export shp file

packages/geo/src/lib/import-export/shared/export.service.ts

@@ -16,6 +16,8 @@ import {
 } from './export.errors';
 import { EncodingFormat, ExportFormat } from './export.type';
 
+const SHAPEFILE_FIELD_MAX_LENGHT = 255;
+
 @Injectable({
   providedIn: 'root'
 })
@@ -78,9 +80,16 @@ export class ExportService {
     }
 
     return olFeatures.map((olFeature: OlFeature<OlGeometry>) => {
-      const keys = olFeature
+      let keys = olFeature
         .getKeys()
         .filter((key: string) => !key.startsWith(excludePrefix));
+
+      if (format === ExportFormat.Shapefile && olFeature.get('_style')) {
+        const style = JSON.stringify(olFeature.get('_style'));
+        if (style.length > SHAPEFILE_FIELD_MAX_LENGHT)
+          keys = keys.filter((key) => key !== '_style');
+      }
+
       const properties = keys.reduce(
         (acc: object, key: string) => {
           acc[key] = olFeature.get(key);

packages/geo/src/lib/style/shared/feature/feature-style.ts

@@ -1,3 +1,5 @@
+import { isValidJSON } from '@igo2/utils';
+
 import olFeature from 'ol/Feature';
 import * as olGeom from 'ol/geom';
 import type { default as OlGeometry } from 'ol/geom/Geometry';
@@ -21,7 +23,7 @@ export function featureRandomStyleFunction(): (
   });
   return (olFeature: olFeature<OlGeometry>, resolution: number) => {
     const customStyle = olFeature.get('_style');
-    if (customStyle) {
+    if (customStyle && isValidJSON(customStyle)) {
       if (
         customStyle.circle &&
         olFeature.get('rad') &&

packages/utils/src/lib/file.ts

@@ -32,3 +32,16 @@ export function downloadFromUri(uri: string, fileName: string) {
 
   document.body.removeChild(element);
 }
+
+/**
+ * Validate if string is valid json object
+ * @param jsonString
+ * @return boolean
+ */
+export function isValidJSON(jsonString: string): boolean {
+  try {
+    return JSON.parse(jsonString) && !!jsonString;
+  } catch (e) {
+    return false;
+  }
+}