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feat: improve error reporting for bad/missing discriminator #718

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merged 1 commit into from Dec 19, 2022
Merged

feat: improve error reporting for bad/missing discriminator #718

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25 changes: 22 additions & 3 deletions openapi3/schema.go
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Expand Up @@ -922,16 +922,35 @@ func (schema *Schema) visitSetOperations(settings *schemaValidationSettings, val
if valuemap, okcheck := value.(map[string]interface{}); okcheck {
discriminatorVal, okcheck := valuemap[pn]
if !okcheck {
return errors.New("input does not contain the discriminator property")
return &SchemaError{
Schema: schema,
SchemaField: "discriminator",
Reason: fmt.Sprintf("input does not contain the discriminator property %q", pn),
}
}

discriminatorValString, okcheck := discriminatorVal.(string)
if !okcheck {
return errors.New("descriminator value is not a string")
valStr := "null"
if discriminatorVal != nil {
valStr = fmt.Sprintf("%v", discriminatorVal)
}

return &SchemaError{
Value: discriminatorVal,
Schema: schema,
SchemaField: "discriminator",
Reason: fmt.Sprintf("value of discriminator property %q is not a string: %v", pn, valStr),
}
}

if discriminatorRef, okcheck = schema.Discriminator.Mapping[discriminatorValString]; len(schema.Discriminator.Mapping) > 0 && !okcheck {
return errors.New("input does not contain a valid discriminator value")
return &SchemaError{
Value: discriminatorVal,
Schema: schema,
SchemaField: "discriminator",
Reason: fmt.Sprintf("discriminator property %q has invalid value: %q", pn, discriminatorVal),
}
}
}
}
Expand Down
8 changes: 4 additions & 4 deletions openapi3/schema_oneOf_test.go
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Expand Up @@ -86,7 +86,7 @@ func TestVisitJSON_OneOf_MissingDiscriptorProperty(t *testing.T) {
err = s.Components.Schemas["Animal"].Value.VisitJSON(map[string]interface{}{
"name": "snoopy",
})
require.EqualError(t, err, "input does not contain the discriminator property")
require.ErrorContains(t, err, "input does not contain the discriminator property \"$type\"\n")
}

func TestVisitJSON_OneOf_MissingDiscriptorValue(t *testing.T) {
Expand All @@ -96,7 +96,7 @@ func TestVisitJSON_OneOf_MissingDiscriptorValue(t *testing.T) {
"name": "snoopy",
"$type": "snake",
})
require.EqualError(t, err, "input does not contain a valid discriminator value")
require.ErrorContains(t, err, "discriminator property \"$type\" has invalid value: \"snake\"")
}

func TestVisitJSON_OneOf_MissingField(t *testing.T) {
Expand Down Expand Up @@ -126,14 +126,14 @@ func TestVisitJSON_OneOf_BadDescriminatorType(t *testing.T) {
"scratches": true,
"$type": 1,
})
require.EqualError(t, err, "descriminator value is not a string")
require.ErrorContains(t, err, "value of discriminator property \"$type\" is not a string: 1")

err = s.Components.Schemas["Animal"].Value.VisitJSON(map[string]interface{}{
"name": "snoopy",
"barks": true,
"$type": nil,
})
require.EqualError(t, err, "descriminator value is not a string")
require.ErrorContains(t, err, "value of discriminator property \"$type\" is not a string: null")
}

func TestVisitJSON_OneOf_Path(t *testing.T) {
Expand Down