[python] Fix date-time parsing (#6458)

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java

@@ -722,7 +722,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
         }
 
         // correct "'"s into "'"s after toString()
-        if (ModelUtils.isStringSchema(schema) && schema.getDefault() != null) {
+        if (ModelUtils.isStringSchema(schema) && schema.getDefault() != null && !ModelUtils.isDateSchema(schema) && !ModelUtils.isDateTimeSchema(schema)) {
             example = (String) schema.getDefault();
         }
 

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientExperimentalCodegen.java

@@ -38,8 +38,9 @@ import org.openapitools.codegen.meta.Stability;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.text.DateFormat;
+import java.time.OffsetDateTime;
-import java.text.SimpleDateFormat;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
 import java.io.File;
 import java.util.*;
 import java.util.regex.Pattern;
@@ -196,15 +197,15 @@ public class PythonClientExperimentalCodegen extends PythonClientCodegen {
         return "python-experimental";
     }
 
-    public String dateToString(Schema p, Date date, DateFormat dateFormatter, DateFormat dateTimeFormatter) {
+    public String dateToString(Schema p, OffsetDateTime date, DateTimeFormatter dateFormatter, DateTimeFormatter dateTimeFormatter) {
         // converts a date into a date or date-time python string
         if (!(ModelUtils.isDateSchema(p) || ModelUtils.isDateTimeSchema(p))) {
             throw new RuntimeException("passed schema must be of type Date or DateTime");
         }
         if (ModelUtils.isDateSchema(p)) {
-            return "dateutil_parser('" + dateFormatter.format(date) + "').date()";
+            return "dateutil_parser('" + date.format(dateFormatter) + "').date()";
         }
-        return "dateutil_parser('" + dateTimeFormatter.format(date) + "')";
+        return "dateutil_parser('" + date.format(dateTimeFormatter) + "')";
     }
 
     /**
@@ -228,20 +229,17 @@ public class PythonClientExperimentalCodegen extends PythonClientCodegen {
         }
 
         // convert datetime and date enums if they exist
-        DateFormat iso8601Date = new SimpleDateFormat("yyyy-MM-dd", Locale.ROOT);
+        DateTimeFormatter iso8601Date = DateTimeFormatter.ISO_DATE;
-        DateFormat iso8601DateTime = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ROOT);
+        DateTimeFormatter iso8601DateTime = DateTimeFormatter.ISO_DATE_TIME;
-        TimeZone utc = TimeZone.getTimeZone("UTC");
-        iso8601Date.setTimeZone(utc);
-        iso8601DateTime.setTimeZone(utc);
 
         if (ModelUtils.isDateSchema(p) || ModelUtils.isDateTimeSchema(p)) {
             List<Object> currentEnum = p.getEnum();
             List<String> fixedEnum = new ArrayList<String>();
             String fixedValue = null;
-            Date date = null;
+            OffsetDateTime date = null;
             if (currentEnum != null && !currentEnum.isEmpty()) {
                 for (Object enumItem : currentEnum) {
-                    date = (Date) enumItem;
+                    date = (OffsetDateTime) enumItem;
                     fixedValue = dateToString(p, date, iso8601Date, iso8601DateTime);
                     fixedEnum.add(fixedValue);
                 }
@@ -251,15 +249,21 @@ public class PythonClientExperimentalCodegen extends PythonClientCodegen {
             // convert the example if it exists
             Object currentExample = p.getExample();
             if (currentExample != null) {
-                date = (Date) currentExample;
+                try {
+                    date = (OffsetDateTime) currentExample;
+                } catch (ClassCastException e) {
+                    date = ((Date) currentExample).toInstant().atOffset(ZoneOffset.UTC);
+                    LOGGER.warn("Invalid `date-time` format for value {}", currentExample);
+                }
                 fixedValue = dateToString(p, date, iso8601Date, iso8601DateTime);
                 fixedEnum.add(fixedValue);
                 p.setExample(fixedValue);
+                LOGGER.warn(fixedValue);
             }
 
             // fix defaultObject
             if (defaultObject != null) {
-                date = (Date) defaultObject;
+                date = (OffsetDateTime) defaultObject;
                 fixedValue = dateToString(p, date, iso8601Date, iso8601DateTime);
                 p.setDefault(fixedValue);
                 defaultObject = fixedValue;
@@ -922,7 +926,6 @@ public class PythonClientExperimentalCodegen extends PythonClientCodegen {
      * @return a comma-separated string representation of the Python types
      */
     private String getTypeString(Schema p, String prefix, String suffix, List<String> referencedModelNames) {
-        // this is used to set dataType, which defines a python tuple of classes
         String fullSuffix = suffix;
         if (")".equals(suffix)) {
             fullSuffix = "," + suffix;

modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientExperimentalTest.java

@@ -21,8 +21,10 @@ import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.media.*;
 import io.swagger.v3.parser.util.SchemaTypeUtil;
+import java.time.OffsetDateTime;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.PythonClientExperimentalCodegen;
+import org.openapitools.codegen.utils.ModelUtils;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
@@ -293,4 +295,14 @@ public class PythonClientExperimentalTest {
         Assert.assertEquals(cm.imports.size(), 0);
     }
 
+    @Test(description = "parse date and date-time example value")
+    public void parseDateAndDateTimeExamplesTest() {
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/python-experimental/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml");
+        final DefaultCodegen codegen = new PythonClientExperimentalCodegen();
+
+        Schema modelSchema = ModelUtils.getSchema(openAPI, "DateTimeTest");
+        String defaultValue = codegen.toDefaultValue(modelSchema);
+        Assert.assertEquals(defaultValue, "dateutil_parser('2010-01-01T10:10:10.000111+01:00')");
+    }
+
 }

modules/openapi-generator/src/test/resources/3_0/python-experimental/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml

@@ -758,6 +758,8 @@ paths:
                   description: None
                   type: string
                   format: date-time
+                  default: '2010-02-01T10:20:10.11111+01:00'
+                  example: '2020-02-02T20:20:20.22222Z'
                 password:
                   description: None
                   type: string
@@ -1202,6 +1204,7 @@ components:
         shipDate:
           type: string
           format: date-time
+          example: '2020-02-02T20:20:20.000222Z'
         status:
           type: string
           description: Order Status
@@ -1466,9 +1469,11 @@ components:
         date:
           type: string
           format: date
+          example: '2020-02-02'
         dateTime:
           type: string
           format: date-time
+          example: '2007-12-03T10:15:30+01:00'
         uuid:
           type: string
           format: uuid
@@ -2069,3 +2074,8 @@ components:
           properties:
             name:
               type: string
+    DateTimeTest:
+      type: string
+      default: '2010-01-01T10:10:10.000111+01:00'
+      example: '2010-01-01T10:10:10.000111+01:00'
+      format: date-time

samples/openapi3/client/petstore/python-experimental/docs/InlineObject3.md

@@ -14,7 +14,7 @@ Name | Type | Description | Notes
 **string** | **str** | None | [optional] 
 **binary** | **file_type** | None | [optional] 
 **date** | **date** | None | [optional] 
-**date_time** | **datetime** | None | [optional] 
+**date_time** | **datetime** | None | [optional]  if omitted the server will use the default value of dateutil_parser('2010-02-01T10:20:10.11111+01:00')
 **password** | **str** | None | [optional] 
 **callback** | **str** | None | [optional] 
 

samples/openapi3/client/petstore/python-experimental/petstore_api/model/inline_object3.py

@@ -210,7 +210,7 @@ class InlineObject3(ModelNormal):
             string (str): None. [optional]  # noqa: E501
             binary (file_type): None. [optional]  # noqa: E501
             date (date): None. [optional]  # noqa: E501
-            date_time (datetime): None. [optional]  # noqa: E501
+            date_time (datetime): None. [optional] if omitted the server will use the default value of dateutil_parser('2010-02-01T10:20:10.11111+01:00')  # noqa: E501
             password (str): None. [optional]  # noqa: E501
             callback (str): None. [optional]  # noqa: E501
         """