[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/cluster/mock_plugin_api_test.go

@@ -0,0 +1,150 @@
+package cluster
+
+import (
+	"bytes"
+	"sort"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/mattermost/mattermost/server/public/model"
+)
+
+type mockPluginAPI struct {
+	t *testing.T
+
+	lock              sync.Mutex
+	keyValues         map[string][]byte
+	failing           bool
+	failingWithPrefix string
+}
+
+func newMockPluginAPI(t *testing.T) *mockPluginAPI {
+	return &mockPluginAPI{
+		t:         t,
+		keyValues: make(map[string][]byte),
+	}
+}
+
+func (pluginAPI *mockPluginAPI) setFailing(failing bool) {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	pluginAPI.failing = failing
+}
+
+func (pluginAPI *mockPluginAPI) setFailingWithPrefix(prefix string) {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	pluginAPI.failingWithPrefix = prefix
+}
+
+func (pluginAPI *mockPluginAPI) clear() {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	for k := range pluginAPI.keyValues {
+		delete(pluginAPI.keyValues, k)
+	}
+}
+
+func (pluginAPI *mockPluginAPI) KVGet(key string) ([]byte, *model.AppError) {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	if pluginAPI.failing {
+		return nil, &model.AppError{Message: "fake error"}
+	}
+
+	if pluginAPI.failingWithPrefix != "" && strings.HasPrefix(key, pluginAPI.failingWithPrefix) {
+		return nil, &model.AppError{Message: "fake error for prefix " + pluginAPI.failingWithPrefix}
+	}
+
+	return pluginAPI.keyValues[key], nil
+}
+
+func (pluginAPI *mockPluginAPI) KVDelete(key string) *model.AppError {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	if pluginAPI.failing {
+		return &model.AppError{Message: "fake error"}
+	}
+
+	if pluginAPI.failingWithPrefix != "" && strings.HasPrefix(key, pluginAPI.failingWithPrefix) {
+		return &model.AppError{Message: "fake error for prefix " + pluginAPI.failingWithPrefix}
+	}
+
+	delete(pluginAPI.keyValues, key)
+
+	return nil
+}
+
+func (pluginAPI *mockPluginAPI) KVList(page, count int) ([]string, *model.AppError) {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	if pluginAPI.failing {
+		return nil, &model.AppError{Message: "fake error"}
+	}
+
+	keys := make([]string, 0, len(pluginAPI.keyValues))
+	for k := range pluginAPI.keyValues {
+		keys = append(keys, k)
+	}
+
+	// have to sort, because we're paging below
+	sort.Strings(keys)
+
+	start := min(page*count, len(keys))
+	end := min((page+1)*count, len(keys))
+	return keys[start:end], nil
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func (pluginAPI *mockPluginAPI) KVSetWithOptions(key string, value []byte, options model.PluginKVSetOptions) (bool, *model.AppError) {
+	pluginAPI.lock.Lock()
+	defer pluginAPI.lock.Unlock()
+
+	if pluginAPI.failing {
+		return false, &model.AppError{Message: "fake error"}
+	}
+
+	if pluginAPI.failingWithPrefix != "" && strings.HasPrefix(key, pluginAPI.failingWithPrefix) {
+		return false, &model.AppError{Message: "fake error for prefix " + pluginAPI.failingWithPrefix}
+	}
+
+	if options.Atomic {
+		if actualValue := pluginAPI.keyValues[key]; !bytes.Equal(actualValue, options.OldValue) {
+			return false, nil
+		}
+	}
+
+	if value == nil {
+		delete(pluginAPI.keyValues, key)
+	} else {
+		pluginAPI.keyValues[key] = value
+	}
+
+	return true, nil
+}
+
+func (pluginAPI *mockPluginAPI) LogError(msg string, keyValuePairs ...interface{}) {
+	if pluginAPI.t == nil {
+		return
+	}
+
+	pluginAPI.t.Helper()
+
+	params := []interface{}{msg}
+	params = append(params, keyValuePairs...)
+
+	pluginAPI.t.Log(params...)
+}