Use upstream slack-go/slack again (#1018)

1 files changed, 353 insertions, 0 deletions

diff --git a/vendor/github.com/slack-go/slack/block_conv.go b/vendor/github.com/slack-go/slack/block_conv.go
new file mode 100644
index 00000000..ce48ce19
--- /dev/null
+++ b/vendor/github.com/slack-go/slack/block_conv.go
@@ -0,0 +1,353 @@
+package slack
+
+import (
+	"encoding/json"
+
+	"github.com/pkg/errors"
+)
+
+type sumtype struct {
+	TypeVal string `json:"type"`
+}
+
+// MarshalJSON implements the Marshaller interface for Blocks so that any JSON
+// marshalling is delegated and proper type determination can be made before marshal
+func (b Blocks) MarshalJSON() ([]byte, error) {
+	bytes, err := json.Marshal(b.BlockSet)
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes, nil
+}
+
+// UnmarshalJSON implements the Unmarshaller interface for Blocks, so that any JSON
+// unmarshalling is delegated and proper type determination can be made before unmarshal
+func (b *Blocks) UnmarshalJSON(data []byte) error {
+	var raw []json.RawMessage
+
+	if string(data) == "{}" {
+		return nil
+	}
+
+	err := json.Unmarshal(data, &raw)
+	if err != nil {
+		return err
+	}
+
+	var blocks Blocks
+	for _, r := range raw {
+		s := sumtype{}
+		err := json.Unmarshal(r, &s)
+		if err != nil {
+			return err
+		}
+
+		var blockType string
+		if s.TypeVal != "" {
+			blockType = s.TypeVal
+		}
+
+		var block Block
+		switch blockType {
+		case "actions":
+			block = &ActionBlock{}
+		case "context":
+			block = &ContextBlock{}
+		case "divider":
+			block = &DividerBlock{}
+		case "image":
+			block = &ImageBlock{}
+		case "input":
+			block = &InputBlock{}
+		case "section":
+			block = &SectionBlock{}
+		case "rich_text":
+			// for now ignore the (complex) content of rich_text blocks until we can fully support it
+			continue
+		case "file":
+			// for now ignore the file blocks until we can fully support it
+			continue
+		default:
+			return errors.New("unsupported block type")
+		}
+
+		err = json.Unmarshal(r, block)
+		if err != nil {
+			return err
+		}
+
+		blocks.BlockSet = append(blocks.BlockSet, block)
+	}
+
+	*b = blocks
+	return nil
+}
+
+// UnmarshalJSON implements the Unmarshaller interface for InputBlock, so that any JSON
+// unmarshalling is delegated and proper type determination can be made before unmarshal
+func (b *InputBlock) UnmarshalJSON(data []byte) error {
+	type alias InputBlock
+	a := struct {
+		Element json.RawMessage `json:"element"`
+		*alias
+	}{
+		alias: (*alias)(b),
+	}
+
+	if err := json.Unmarshal(data, &a); err != nil {
+		return err
+	}
+
+	s := sumtype{}
+	if err := json.Unmarshal(a.Element, &s); err != nil {
+		return nil
+	}
+
+	var e BlockElement
+	switch s.TypeVal {
+	case "datepicker":
+		e = &DatePickerBlockElement{}
+	case "plain_text_input":
+		e = &PlainTextInputBlockElement{}
+	case "static_select", "external_select", "users_select", "conversations_select", "channels_select":
+		e = &SelectBlockElement{}
+	default:
+		return errors.New("unsupported block element type")
+	}
+
+	if err := json.Unmarshal(a.Element, e); err != nil {
+		return err
+	}
+	b.Element = e
+
+	return nil
+}
+
+// MarshalJSON implements the Marshaller interface for BlockElements so that any JSON
+// marshalling is delegated and proper type determination can be made before marshal
+func (b *BlockElements) MarshalJSON() ([]byte, error) {
+	bytes, err := json.Marshal(b.ElementSet)
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes, nil
+}
+
+// UnmarshalJSON implements the Unmarshaller interface for BlockElements, so that any JSON
+// unmarshalling is delegated and proper type determination can be made before unmarshal
+func (b *BlockElements) UnmarshalJSON(data []byte) error {
+	var raw []json.RawMessage
+
+	if string(data) == "{}" {
+		return nil
+	}
+
+	err := json.Unmarshal(data, &raw)
+	if err != nil {
+		return err
+	}
+
+	var blockElements BlockElements
+	for _, r := range raw {
+		s := sumtype{}
+		err := json.Unmarshal(r, &s)
+		if err != nil {
+			return err
+		}
+
+		var blockElementType string
+		if s.TypeVal != "" {
+			blockElementType = s.TypeVal
+		}
+
+		var blockElement BlockElement
+		switch blockElementType {
+		case "image":
+			blockElement = &ImageBlockElement{}
+		case "button":
+			blockElement = &ButtonBlockElement{}
+		case "overflow":
+			blockElement = &OverflowBlockElement{}
+		case "datepicker":
+			blockElement = &DatePickerBlockElement{}
+		case "plain_text_input":
+			blockElement = &PlainTextInputBlockElement{}
+		case "static_select", "external_select", "users_select", "conversations_select", "channels_select":
+			blockElement = &SelectBlockElement{}
+		default:
+			return errors.New("unsupported block element type")
+		}
+
+		err = json.Unmarshal(r, blockElement)
+		if err != nil {
+			return err
+		}
+
+		blockElements.ElementSet = append(blockElements.ElementSet, blockElement)
+	}
+
+	*b = blockElements
+	return nil
+}
+
+// MarshalJSON implements the Marshaller interface for Accessory so that any JSON
+// marshalling is delegated and proper type determination can be made before marshal
+func (a *Accessory) MarshalJSON() ([]byte, error) {
+	bytes, err := json.Marshal(toBlockElement(a))
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes, nil
+}
+
+// UnmarshalJSON implements the Unmarshaller interface for Accessory, so that any JSON
+// unmarshalling is delegated and proper type determination can be made before unmarshal
+func (a *Accessory) UnmarshalJSON(data []byte) error {
+	var r json.RawMessage
+
+	if string(data) == "{\"accessory\":null}" {
+		return nil
+	}
+
+	err := json.Unmarshal(data, &r)
+	if err != nil {
+		return err
+	}
+
+	s := sumtype{}
+	err = json.Unmarshal(r, &s)
+	if err != nil {
+		return err
+	}
+
+	var blockElementType string
+	if s.TypeVal != "" {
+		blockElementType = s.TypeVal
+	}
+
+	switch blockElementType {
+	case "image":
+		element, err := unmarshalBlockElement(r, &ImageBlockElement{})
+		if err != nil {
+			return err
+		}
+		a.ImageElement = element.(*ImageBlockElement)
+	case "button":
+		element, err := unmarshalBlockElement(r, &ButtonBlockElement{})
+		if err != nil {
+			return err
+		}
+		a.ButtonElement = element.(*ButtonBlockElement)
+	case "overflow":
+		element, err := unmarshalBlockElement(r, &OverflowBlockElement{})
+		if err != nil {
+			return err
+		}
+		a.OverflowElement = element.(*OverflowBlockElement)
+	case "datepicker":
+		element, err := unmarshalBlockElement(r, &DatePickerBlockElement{})
+		if err != nil {
+			return err
+		}
+		a.DatePickerElement = element.(*DatePickerBlockElement)
+	case "static_select":
+		element, err := unmarshalBlockElement(r, &SelectBlockElement{})
+		if err != nil {
+			return err
+		}
+		a.SelectElement = element.(*SelectBlockElement)
+	}
+
+	return nil
+}
+
+func unmarshalBlockElement(r json.RawMessage, element BlockElement) (BlockElement, error) {
+	err := json.Unmarshal(r, element)
+	if err != nil {
+		return nil, err
+	}
+	return element, nil
+}
+
+func toBlockElement(element *Accessory) BlockElement {
+	if element.ImageElement != nil {
+		return element.ImageElement
+	}
+	if element.ButtonElement != nil {
+		return element.ButtonElement
+	}
+	if element.OverflowElement != nil {
+		return element.OverflowElement
+	}
+	if element.DatePickerElement != nil {
+		return element.DatePickerElement
+	}
+	if element.SelectElement != nil {
+		return element.SelectElement
+	}
+
+	return nil
+}
+
+// MarshalJSON implements the Marshaller interface for ContextElements so that any JSON
+// marshalling is delegated and proper type determination can be made before marshal
+func (e *ContextElements) MarshalJSON() ([]byte, error) {
+	bytes, err := json.Marshal(e.Elements)
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes, nil
+}
+
+// UnmarshalJSON implements the Unmarshaller interface for ContextElements, so that any JSON
+// unmarshalling is delegated and proper type determination can be made before unmarshal
+func (e *ContextElements) UnmarshalJSON(data []byte) error {
+	var raw []json.RawMessage
+
+	if string(data) == "{\"elements\":null}" {
+		return nil
+	}
+
+	err := json.Unmarshal(data, &raw)
+	if err != nil {
+		return err
+	}
+
+	for _, r := range raw {
+		s := sumtype{}
+		err := json.Unmarshal(r, &s)
+		if err != nil {
+			return err
+		}
+
+		var contextElementType string
+		if s.TypeVal != "" {
+			contextElementType = s.TypeVal
+		}
+
+		switch contextElementType {
+		case PlainTextType, MarkdownType:
+			elem, err := unmarshalBlockObject(r, &TextBlockObject{})
+			if err != nil {
+				return err
+			}
+
+			e.Elements = append(e.Elements, elem.(*TextBlockObject))
+		case "image":
+			elem, err := unmarshalBlockElement(r, &ImageBlockElement{})
+			if err != nil {
+				return err
+			}
+
+			e.Elements = append(e.Elements, elem.(*ImageBlockElement))
+		default:
+			return errors.New("unsupported context element type")
+		}
+	}
+
+	return nil
+}