Add vk bridge (#1372)

* Add vk bridge

* Vk bridge attachments

* Vk bridge forwarded messages

* Vk bridge sample config and code cleanup

* Vk bridge add vendor

* Vk bridge message edit

* Vk bridge: fix fetching names of other bots

* Vk bridge: code cleanup

* Vk bridge: fix shadows declaration

* Vk bridge: remove UseFileURL

vendor/github.com/SevereCloud/vksdk/v2/object/docs.go

@@ -0,0 +1,117 @@
+package object // import "github.com/SevereCloud/vksdk/v2/object"
+
+import (
+	"fmt"
+)
+
+// DocsDoc struct.
+type DocsDoc struct {
+	AccessKey  string         `json:"access_key"` // Access key for the document
+	Date       int            `json:"date"`       // Date when file has been uploaded in Unixtime
+	Ext        string         `json:"ext"`        // File extension
+	ID         int            `json:"id"`         // Document ID
+	IsLicensed BaseBoolInt    `json:"is_licensed"`
+	OwnerID    int            `json:"owner_id"` // Document owner ID
+	Preview    DocsDocPreview `json:"preview"`
+	Size       int            `json:"size"`  // File size in bites
+	Title      string         `json:"title"` // Document title
+	Type       int            `json:"type"`  // Document type
+	URL        string         `json:"url"`   // File URL
+	DocsDocPreviewAudioMessage
+	DocsDocPreviewGraffiti
+}
+
+// ToAttachment return attachment format.
+func (doc DocsDoc) ToAttachment() string {
+	return fmt.Sprintf("doc%d_%d", doc.OwnerID, doc.ID)
+}
+
+// DocsDocPreview struct.
+type DocsDocPreview struct {
+	Photo        DocsDocPreviewPhoto        `json:"photo"`
+	Graffiti     DocsDocPreviewGraffiti     `json:"graffiti"`
+	Video        DocsDocPreviewVideo        `json:"video"`
+	AudioMessage DocsDocPreviewAudioMessage `json:"audio_message"`
+}
+
+// DocsDocPreviewPhoto struct.
+type DocsDocPreviewPhoto struct {
+	Sizes []DocsDocPreviewPhotoSizes `json:"sizes"`
+}
+
+// MaxSize return the largest DocsDocPreviewPhotoSizes.
+func (photo DocsDocPreviewPhoto) MaxSize() (maxPhotoSize DocsDocPreviewPhotoSizes) {
+	var max float64
+
+	for _, photoSize := range photo.Sizes {
+		size := photoSize.Height * photoSize.Width
+		if size > max {
+			max = size
+			maxPhotoSize = photoSize
+		}
+	}
+
+	return
+}
+
+// MinSize return the smallest DocsDocPreviewPhotoSizes.
+func (photo DocsDocPreviewPhoto) MinSize() (minPhotoSize DocsDocPreviewPhotoSizes) {
+	var min float64
+
+	for _, photoSize := range photo.Sizes {
+		size := photoSize.Height * photoSize.Width
+		if size < min || min == 0 {
+			min = size
+			minPhotoSize = photoSize
+		}
+	}
+
+	return
+}
+
+// DocsDocPreviewPhotoSizes struct.
+type DocsDocPreviewPhotoSizes struct {
+	// BUG(VK): json: cannot unmarshal number 162.000000 into Go struct field
+	// DocsDocPreviewPhotoSizes.doc.preview.photo.sizes.height of type Int
+	Height float64 `json:"height"` // Height in px
+	Src    string  `json:"src"`    // URL of the image
+	Type   string  `json:"type"`
+	Width  float64 `json:"width"` // Width in px
+}
+
+// DocsDocPreviewGraffiti struct.
+type DocsDocPreviewGraffiti struct {
+	Src    string `json:"src"`
+	Width  int    `json:"width"`
+	Height int    `json:"height"`
+}
+
+// DocsDocPreviewVideo struct.
+type DocsDocPreviewVideo struct {
+	FileSize int    `json:"file_size"` // Video file size in bites
+	Height   int    `json:"height"`    // Video's height in pixels
+	Src      string `json:"src"`       // Video URL
+	Width    int    `json:"width"`     // Video's width in pixels
+}
+
+// DocsDocPreviewAudioMessage struct.
+type DocsDocPreviewAudioMessage struct {
+	Duration        int    `json:"duration"`
+	Waveform        []int  `json:"waveform"`
+	LinkOgg         string `json:"link_ogg"`
+	LinkMp3         string `json:"link_mp3"`
+	Transcript      string `json:"transcript"`
+	TranscriptState string `json:"transcript_state"`
+}
+
+// DocsDocTypes struct.
+type DocsDocTypes struct {
+	Count int    `json:"count"` // Number of docs
+	ID    int    `json:"id"`    // Doc type ID
+	Name  string `json:"name"`  // Doc type Title
+}
+
+// DocsDocUploadResponse struct.
+type DocsDocUploadResponse struct {
+	File string `json:"file"` // Uploaded file data
+}