Refactor and update RocketChat bridge

* Add support for editing/deleting messages
* Add support for uploading files
* Add support for avatars
* Use the Rocket.Chat.Go.SDK
* Use the rest and streaming api

vendor/github.com/gopackage/ddp/ddp_ejson.go

@@ -0,0 +1,217 @@
+package ddp
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"io"
+	"strings"
+	"time"
+)
+
+// ----------------------------------------------------------------------
+// EJSON document interface
+// ----------------------------------------------------------------------
+// https://github.com/meteor/meteor/blob/devel/packages/ddp/DDP.md#appendix-ejson
+
+// Doc provides hides the complexity of ejson documents.
+type Doc struct {
+	root interface{}
+}
+
+// NewDoc creates a new document from a generic json parsed document.
+func NewDoc(in interface{}) *Doc {
+	doc := &Doc{in}
+	return doc
+}
+
+// Map locates a map[string]interface{} - json object - at a path
+// or returns nil if not found.
+func (d *Doc) Map(path string) map[string]interface{} {
+	item := d.Item(path)
+	if item != nil {
+		switch m := item.(type) {
+		case map[string]interface{}:
+			return m
+		default:
+			return nil
+		}
+	}
+	return nil
+}
+
+// Array locates an []interface{} - json array - at a path
+// or returns nil if not found.
+func (d *Doc) Array(path string) []interface{} {
+	item := d.Item(path)
+	if item != nil {
+		switch m := item.(type) {
+		case []interface{}:
+			return m
+		default:
+			return nil
+		}
+	}
+	return nil
+}
+
+// StringArray locates an []string - json array of strings - at a path
+// or returns nil if not found. The string array will contain all string values
+// in the array and skip any non-string entries.
+func (d *Doc) StringArray(path string) []string {
+	item := d.Item(path)
+	if item != nil {
+		switch m := item.(type) {
+		case []interface{}:
+			items := []string{}
+			for _, item := range m {
+				switch val := item.(type) {
+				case string:
+					items = append(items, val)
+				}
+			}
+			return items
+		case []string:
+			return m
+		default:
+			return nil
+		}
+	}
+	return nil
+}
+
+// String returns a string value located at the path or an empty string if not found.
+func (d *Doc) String(path string) string {
+	item := d.Item(path)
+	if item != nil {
+		switch m := item.(type) {
+		case string:
+			return m
+		default:
+			return ""
+		}
+	}
+	return ""
+}
+
+// Bool returns a boolean value located at the path or false if not found.
+func (d *Doc) Bool(path string) bool {
+	item := d.Item(path)
+	if item != nil {
+		switch m := item.(type) {
+		case bool:
+			return m
+		default:
+			return false
+		}
+	}
+	return false
+}
+
+// Float returns a float64 value located at the path or zero if not found.
+func (d *Doc) Float(path string) float64 {
+	item := d.Item(path)
+	if item != nil {
+		switch m := item.(type) {
+		case float64:
+			return m
+		default:
+			return 0
+		}
+	}
+	return 0
+}
+
+// Time returns a time value located at the path or nil if not found.
+func (d *Doc) Time(path string) time.Time {
+	ticks := d.Float(path + ".$date")
+	var t time.Time
+	if ticks > 0 {
+		sec := int64(ticks / 1000)
+		t = time.Unix(int64(sec), 0)
+	}
+	return t
+}
+
+// Item locates a "raw" item at the provided path, returning
+// the item found or nil if not found.
+func (d *Doc) Item(path string) interface{} {
+	item := d.root
+	steps := strings.Split(path, ".")
+	for _, step := range steps {
+		// This is an intermediate step - we must be in a map
+		switch m := item.(type) {
+		case map[string]interface{}:
+			item = m[step]
+		case Update:
+			item = m[step]
+		default:
+			return nil
+		}
+	}
+	return item
+}
+
+// Set a value for a path. Intermediate items are created as necessary.
+func (d *Doc) Set(path string, value interface{}) {
+	item := d.root
+	steps := strings.Split(path, ".")
+	last := steps[len(steps)-1]
+	steps = steps[:len(steps)-1]
+	for _, step := range steps {
+		// This is an intermediate step - we must be in a map
+		switch m := item.(type) {
+		case map[string]interface{}:
+			item = m[step]
+			if item == nil {
+				item = map[string]interface{}{}
+				m[step] = item
+			}
+		default:
+			return
+		}
+	}
+	// Item is now the last map so we just set the value
+	switch m := item.(type) {
+	case map[string]interface{}:
+		m[last] = value
+	}
+}
+
+// Accounts password login support
+type Login struct {
+	User     *User     `json:"user"`
+	Password *Password `json:"password"`
+}
+
+func NewEmailLogin(email, pass string) *Login {
+	return &Login{User: &User{Email: email}, Password: NewPassword(pass)}
+}
+
+func NewUsernameLogin(user, pass string) *Login {
+	return &Login{User: &User{Username: user}, Password: NewPassword(pass)}
+}
+
+type LoginResume struct {
+	Token string `json:"resume"`
+}
+
+func NewLoginResume(token string) *LoginResume {
+	return &LoginResume{Token: token}
+}
+
+type User struct {
+	Email    string `json:"email,omitempty"`
+	Username string `json:"username,omitempty"`
+}
+
+type Password struct {
+	Digest    string `json:"digest"`
+	Algorithm string `json:"algorithm"`
+}
+
+func NewPassword(pass string) *Password {
+	sha := sha256.New()
+	io.WriteString(sha, pass)
+	digest := sha.Sum(nil)
+	return &Password{Digest: hex.EncodeToString(digest), Algorithm: "sha-256"}
+}