Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/boards/services/auth/request_parser.go

@@ -0,0 +1,67 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package auth
+
+import (
+	"net/http"
+	"strings"
+)
+
+const (
+	HeaderToken        = "token"
+	HeaderAuth         = "Authorization"
+	HeaderBearer       = "BEARER"
+	SessionCookieToken = "FOCALBOARDAUTHTOKEN"
+)
+
+type TokenLocation int
+
+const (
+	TokenLocationNotFound TokenLocation = iota
+	TokenLocationHeader
+	TokenLocationCookie
+	TokenLocationQueryString
+)
+
+func (tl TokenLocation) String() string {
+	switch tl {
+	case TokenLocationNotFound:
+		return "Not Found"
+	case TokenLocationHeader:
+		return "Header"
+	case TokenLocationCookie:
+		return "Cookie"
+	case TokenLocationQueryString:
+		return "QueryString"
+	default:
+		return "Unknown"
+	}
+}
+
+func ParseAuthTokenFromRequest(r *http.Request) (string, TokenLocation) {
+	authHeader := r.Header.Get(HeaderAuth)
+
+	// Attempt to parse the token from the cookie
+	if cookie, err := r.Cookie(SessionCookieToken); err == nil {
+		return cookie.Value, TokenLocationCookie
+	}
+
+	// Parse the token from the header
+	if len(authHeader) > 6 && strings.ToUpper(authHeader[0:6]) == HeaderBearer {
+		// Default session token
+		return authHeader[7:], TokenLocationHeader
+	}
+
+	if len(authHeader) > 5 && strings.ToLower(authHeader[0:5]) == HeaderToken {
+		// OAuth token
+		return authHeader[6:], TokenLocationHeader
+	}
+
+	// Attempt to parse token out of the query string
+	if token := r.URL.Query().Get("access_token"); token != "" {
+		return token, TokenLocationQueryString
+	}
+
+	return "", TokenLocationNotFound
+}