feat: openfoodfacts#158 - introduction to folksonomy

New files: * `api_folksonomy_test.dart`: Tests around folksonomy * `folksonomy.dart`: Client calls of the Folksonomy API (Open Food Facts) * `KeyStats.dart`: Folksonomy: statistics around a tag key. * `ProductList.dart`: Folksonomy: current value for a product and a tag key. * `ProductStats.dart`: Folksonomy: statistics about the tag keys on a product. * `ProductTag.dart`: Folksonomy product tag: for this barcode, that value is set for that key. Impacted files: * `HttpHelper.dart`: added "delete" and "put" requests * `JsonHelper.dart`: added a helper method around timestamps * `OpenFoodAPIConfiguration.dart`: added reference URIs for folksonomy * `openfoodfacts.dart`: exported folksonomy files * `UriHelper.dart`: added a helper method for folksonomy URIs
monsieurtanuki · Dec 19, 2021 · b5e4f2c · b5e4f2c
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diff --git a/lib/folksonomy.dart b/lib/folksonomy.dart
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+import 'dart:async';
+import 'dart:convert';
+
+import 'package:http/http.dart';
+
+import 'model/KeyStats.dart';
+import 'model/ProductList.dart';
+import 'model/ProductStats.dart';
+import 'model/ProductTag.dart';
+import 'utils/HttpHelper.dart';
+import 'utils/QueryType.dart';
+import 'utils/UriHelper.dart';
+
+/// Client calls of the Folksonomy API (Open Food Facts)
+///
+/// cf. https://api.folksonomy.openfoodfacts.org/docs
+class FolksonomyAPIClient {
+  FolksonomyAPIClient._();
+
+  /// "hello world"
+  static Future<void> hello({
+    final QueryType? queryType,
+  }) async {
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: '/',
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+  }
+
+  /// Returns all the [ProductStats] with that tag key, or with tag key == value
+  static Future<List<ProductStats>> getProductStats({
+    final String? key,
+    final String? value,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    if (key == null && value != null) {
+      throw Exception(
+          'Does a value have a meaning without its key? I don\'t think so.');
+    }
+    if (key != null) {
+      parameters['k'] = key;
+    }
+    if (value != null) {
+      parameters['v'] = value;
+    }
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'products/stats',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    final List<ProductStats> result = <ProductStats>[];
+    final List<dynamic> json = jsonDecode(response.body) as List<dynamic>;
+    for (var element in json) {
+      result.add(ProductStats.fromJson(element));
+    }
+    return result;
+  }
+
+  /// Returns all the products with that tag key.
+  ///
+  /// The key of the returned map is the barcode, the value is the tag value.
+  static Future<Map<String, String>> getProducts({
+    required final String key,
+    final String? value,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    parameters['k'] = key;
+    if (value != null) {
+      parameters['v'] = value;
+    }
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'products',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    final Map<String, String> result = <String, String>{};
+    final List<dynamic> json = jsonDecode(response.body) as List<dynamic>;
+    for (var element in json) {
+      final ProductList productList = ProductList.fromJson(element);
+      if (productList.key != key) {
+        throw Exception('Unexpected key: ${productList.key}');
+      }
+      result[productList.barcode] = productList.value;
+    }
+    return result;
+  }
+
+  /// Returns all the [ProductTag]s for this product
+  ///
+  /// The key of the returned map is the key.
+  static Future<Map<String, ProductTag>> getProductTags({
+    required final String barcode,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'product/$barcode',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    final Map<String, ProductTag> result = <String, ProductTag>{};
+    if (response.body == 'null') {
+      // not found
+      return result;
+    }
+    final List<dynamic> json = jsonDecode(response.body) as List<dynamic>;
+    for (var element in json) {
+      final ProductTag productTag = ProductTag.fromJson(element);
+      result[productTag.key] = productTag;
+    }
+    return result;
+  }
+
+  /// Returns the [ProductTag] for this product and this tag key
+  ///
+  /// Returns null if not found.
+  static Future<ProductTag?> getProductTag({
+    required final String barcode,
+    required final String key,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'product/$barcode/$key',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    if (response.body == 'null') {
+      // not found
+      return null;
+    }
+    final Map<String, dynamic> json =
+        jsonDecode(response.body) as Map<String, dynamic>;
+    return ProductTag.fromJson(json);
+  }
+
+  /// Returns all the [ProductTag]s for this product, with their subkeys.
+  ///
+  /// The key of the returned map is the key.
+  static Future<Map<String, ProductTag>> getProductTagWithSubKeys({
+    required final String barcode,
+    required final String key,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'product/$barcode/$key*', // look at the star!
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    final Map<String, ProductTag> result = <String, ProductTag>{};
+    if (response.body == 'null') {
+      // not found
+      return result;
+    }
+    final List<dynamic> json = jsonDecode(response.body) as List<dynamic>;
+    for (var element in json) {
+      final ProductTag productTag = ProductTag.fromJson(element);
+      result[productTag.key] = productTag;
+    }
+    return result;
+  }
+
+/* TODO
+Future<void> deleteProductTag({
+  required final String barcode,
+  required final String key,
+  required final int version,
+  final QueryType? queryType,
+}) async {
+  final Map<String, String> parameters = <String, String>{};
+  /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+  final Response response = await HttpHelper().doDeleteRequest(
+    UriHelper.getFolksonomyUri(
+      path: 'product/$barcode/$key',
+      queryParameters: parameters,
+      queryType: queryType,
+    ),
+    queryType: queryType,
+  );
+  _checkResponse(response);
+}
+ */
+
+  /// Folksonomy: returns the versions of [ProductTag] for this product and key.
+  static Future<List<ProductTag>> getProductTagVersions({
+    required final String barcode,
+    required final String key,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'product/$barcode/$key/versions',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    final List<ProductTag> result = <ProductTag>[];
+    if (response.body == 'null') {
+      // not found
+      return result;
+    }
+    final List<dynamic> json = jsonDecode(response.body) as List<dynamic>;
+    for (var element in json) {
+      result.add(ProductTag.fromJson(element));
+    }
+    return result;
+  }
+
+  /* TODO
+  /// productTag.version must be equal to previous version + 1
+  static Future<void> updateProductTag({
+    required final ProductTag productTag,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doPutRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'product',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      productTag.toJson().toString(),
+      userAgent: OpenFoodAPIConfiguration.userAgent,
+      queryType: queryType,
+    );
+    _checkResponse(response);
+  }
+   */
+
+  /* TODO
+  /// productTag.version must be equal to 1
+  static Future<void> addProductTag({
+    required final ProductTag productTag,
+    final User? user,
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doPostRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'product',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      {}, // TODO later productTag.toJson(),
+      user,
+      queryType: queryType,
+    );
+    _checkResponse(response);
+  }
+   */
+
+  static Future<Map<String, KeyStats>> getKeys({
+    final QueryType? queryType,
+  }) async {
+    final Map<String, String> parameters = <String, String>{};
+    /* TODO
+    if (owner != null) {
+      parameters['owner'] = owner;
+    }
+     */
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'keys',
+        queryParameters: parameters,
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+    final Map<String, KeyStats> result = <String, KeyStats>{};
+    final List<dynamic> json = jsonDecode(response.body) as List<dynamic>;
+    for (var element in json) {
+      final KeyStats item = KeyStats.fromJson(element);
+      result[item.key] = item;
+    }
+    return result;
+  }
+
+  static Future<void> ping({
+    final QueryType? queryType,
+  }) async {
+    final Response response = await HttpHelper().doGetRequest(
+      UriHelper.getFolksonomyUri(
+        path: 'ping',
+        queryType: queryType,
+      ),
+      queryType: queryType,
+    );
+    _checkResponse(response);
+  }
+
+  static void _checkResponse(final Response response) {
+    if (response.statusCode != 200) {
+      print('ERROR: ${response.body}');
+      throw Exception('Wrong status code: ${response.statusCode}');
+    }
+  }
+}