[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/logrus_test.go

@@ -0,0 +1,85 @@
+package pluginapi_test
+
+import (
+	"testing"
+
+	"github.com/mattermost/mattermost/server/public/plugin/plugintest"
+	"github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+
+	"github.com/mattermost/mattermost/server/public/pluginapi"
+)
+
+func TestLogrus(t *testing.T) {
+	testCases := []struct {
+		Level   logrus.Level
+		APICall string
+	}{
+		{logrus.PanicLevel, "LogError"},
+		{logrus.FatalLevel, "LogError"},
+		{logrus.ErrorLevel, "LogError"},
+		{logrus.WarnLevel, "LogWarn"},
+		{logrus.InfoLevel, "LogInfo"},
+		{logrus.DebugLevel, "LogDebug"},
+		{logrus.TraceLevel, "LogDebug"},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.Level.String(), func(t *testing.T) {
+			logger := logrus.New()
+			logger.SetLevel(logrus.TraceLevel) // not testing logrus filtering
+			logger.ReportCaller = true
+
+			api := &plugintest.API{}
+			defer api.AssertExpectations(t)
+			client := pluginapi.NewClient(api, &plugintest.Driver{})
+
+			pluginapi.ConfigureLogrus(logger, client)
+
+			// Parameter order of map is non-deterministic, so expect either.
+			api.On(testCase.APICall, mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything)
+
+			entry := logger.WithFields(logrus.Fields{
+				"a": "a",
+				"b": 1,
+			})
+
+			if testCase.Level == logrus.PanicLevel {
+				done := make(chan bool)
+				go func() {
+					defer func() {
+						r := recover()
+						assert.NotNil(t, r, "expected panic")
+						close(done)
+					}()
+
+					entry.Panic("message")
+				}()
+				<-done
+			} else {
+				entry.Log(testCase.Level, "message")
+			}
+
+			// Assert the required API call was executed at most once.
+			if api.AssertNumberOfCalls(t, testCase.APICall, 1) {
+				call := api.Calls[0]
+				for i := 1; i < len(call.Arguments)-1; i += 2 {
+					argument := call.Arguments[i]
+					value := call.Arguments[i+1]
+
+					switch argument {
+					case "a":
+						assert.Equal(t, "a", value, "unexpected value for a")
+					case "b":
+						assert.Equal(t, "1", value, "unexpected value for b")
+					case "plugin_caller":
+						assert.IsType(t, "string", value)
+					default:
+						assert.Fail(t, "unexpected argument and value", "%v: %v", argument, value)
+					}
+				}
+			}
+		})
+	}
+}