add create problem api

problem/serializers.py

@@ -1,6 +1,67 @@
 from django import forms
 
+from judge.languages import language_names, spj_language_names
+from utils.api import DateTimeTZField, UsernameSerializer, serializers
+
+from .models import Problem, ProblemRuleType, ProblemTag
+
 
 class TestCaseUploadForm(forms.Form):
     spj = forms.CharField(max_length=12)
     file = forms.FileField()
+
+
+class CreateSampleSerializer(serializers.Serializer):
+    input = serializers.CharField()
+    output = serializers.CharField()
+
+
+class CreateTestCaseScoreSerializer(serializers.Serializer):
+    input_name = serializers.CharField(max_length=32)
+    score = serializers.IntegerField(min_value=0)
+
+
+class Difficulty(object):
+    LOW = "Low"
+    MID = "Mid"
+    HIGH = "High"
+
+
+class CreateProblemSerializer(serializers.Serializer):
+    title = serializers.CharField(max_length=128)
+    description = serializers.CharField()
+    input_description = serializers.CharField()
+    output_description = serializers.CharField()
+    samples = serializers.ListField(child=CreateSampleSerializer())
+    test_case_id = serializers.CharField(max_length=32)
+    test_case_score = serializers.ListField(child=CreateTestCaseScoreSerializer())
+    hint = serializers.CharField(allow_blank=True)
+    time_limit = serializers.IntegerField(min_value=1, max_value=1000 * 60)
+    memory_limit = serializers.IntegerField(min_value=1, max_value=1024)
+    languages = serializers.ListField(child=serializers.ChoiceField(choices=language_names))
+    rule_type = serializers.ChoiceField(choices=[ProblemRuleType.ACM, ProblemRuleType.OI])
+    spj = serializers.BooleanField()
+    spj_language = serializers.ChoiceField(choices=spj_language_names, allow_blank=True)
+    spj_code = serializers.CharField(allow_blank=True)
+    visible = serializers.BooleanField()
+    difficulty = serializers.ChoiceField(choices=[Difficulty.LOW, Difficulty.MID, Difficulty.HIGH])
+    tags = serializers.ListField(child=serializers.CharField(max_length=32))
+    source = serializers.CharField(max_length=256, allow_blank=True)
+
+
+class TagSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = ProblemTag
+
+
+class ProblemSerializer(serializers.ModelSerializer):
+    samples = serializers.JSONField()
+    test_case_score = serializers.JSONField()
+    languages = serializers.JSONField()
+    tags = TagSerializer(many=True)
+    create_time = DateTimeTZField()
+    last_update_time = DateTimeTZField()
+    created_by = UsernameSerializer()
+
+    class Meta:
+        model = Problem