[MM-53968] Includes mattermost-plugin-api into the mono repo (#24235)

Include https://github.com/mattermost/mattermost-plugin-api into the mono repo

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: Michael Kochell <mjkochell@gmail.com>
Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>
Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Alex Dovenmuehle <alex.dovenmuehle@mattermost.com>
Co-authored-by: Michael Kochell <6913320+mickmister@users.noreply.github.com>
Co-authored-by: Christopher Poile <cpoile@gmail.com>
Co-authored-by: İlker Göktuğ Öztürk <ilkergoktugozturk@gmail.com>
Co-authored-by: Shota Gvinepadze <wineson@gmail.com>
Co-authored-by: Ali Farooq <ali.farooq0@pm.me>
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
Co-authored-by: Daniel Espino García <larkox@gmail.com>
Co-authored-by: Christopher Speller <crspeller@gmail.com>
Co-authored-by: Alex Dovenmuehle <adovenmuehle@gmail.com>
Co-authored-by: Szymon Gibała <szymongib@gmail.com>
Co-authored-by: Lev <1187448+levb@users.noreply.github.com>
Co-authored-by: Jason Frerich <jason.frerich@mattermost.com>
Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>
Co-authored-by: Artur M. Wolff <artur.m.wolff@gmail.com>
Co-authored-by: Madhav Hugar <16546715+madhavhugar@users.noreply.github.com>
Co-authored-by: Joe <security.joe@pm.me>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
Co-authored-by: José Peso <trilopin@users.noreply.github.com>

server/public/pluginapi/experimental/command/command.go

@@ -0,0 +1,31 @@
+package command
+
+import (
+	"encoding/base64"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+// PluginAPI is the plugin API interface required to manage slash commands.
+type PluginAPI interface {
+	GetBundlePath() (string, error)
+}
+
+// GetIconData returns the base64 encoding of a icon for a given path.
+// The data returned may be used for slash command autocomplete.
+func GetIconData(api PluginAPI, iconPath string) (string, error) {
+	bundlePath, err := api.GetBundlePath()
+	if err != nil {
+		return "", errors.Wrap(err, "couldn't get bundle path")
+	}
+
+	icon, err := os.ReadFile(filepath.Join(bundlePath, iconPath))
+	if err != nil {
+		return "", errors.Wrap(err, "failed to open icon")
+	}
+
+	return fmt.Sprintf("data:image/svg+xml;base64,%s", base64.StdEncoding.EncodeToString(icon)), nil
+}

server/public/pluginapi/experimental/command/info.go

@@ -0,0 +1,74 @@
+package command
+
+import (
+	"fmt"
+	"regexp"
+	"runtime/debug"
+	"strings"
+	"time"
+
+	"github.com/pkg/errors"
+
+	"github.com/mattermost/mattermost/server/public/model"
+)
+
+var versionRegexp = regexp.MustCompile(`/v\d$`)
+
+func BuildInfoAutocomplete(cmd string) *model.AutocompleteData {
+	return model.NewAutocompleteData(cmd, "", "Display build info")
+}
+
+func BuildInfo(manifest model.Manifest) (string, error) {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "", errors.New("failed to read build info")
+	}
+
+	var (
+		revision      string
+		revisionShort string
+		buildTime     time.Time
+		dirty         bool
+	)
+	for _, s := range info.Settings {
+		switch s.Key {
+		case "vcs.revision":
+			revision = s.Value
+			revisionShort = revision[0:7]
+		case "vcs.time":
+			var err error
+			buildTime, err = time.Parse(time.RFC3339, s.Value)
+
+			if err != nil {
+				return "", err
+			}
+		case "vcs.modified":
+			if s.Value == "true" {
+				dirty = true
+			}
+		}
+	}
+
+	path := info.Main.Path
+
+	matches := versionRegexp.FindAllString(path, -1)
+	if len(matches) > 0 {
+		path = strings.TrimSuffix(path, matches[len(matches)-1])
+	}
+
+	dirtyText := ""
+	if dirty {
+		dirtyText = " (dirty)"
+	}
+
+	commit := fmt.Sprintf("[%s](https://%s/commit/%s)", revisionShort, path, revision)
+
+	return fmt.Sprintf("%s version: %s, %s%s, built %s with %s\n",
+			manifest.Name,
+			manifest.Version,
+			commit,
+			dirtyText,
+			buildTime.Format(time.RFC1123),
+			info.GoVersion),
+		nil
+}