Add a test plugin for Matrix Federation

plugins/.gitignore

@@ -0,0 +1 @@
+*.so

plugins/matrix/Makefile

@@ -0,0 +1,7 @@
+PLUGIN_NAME=matrix
+TARGET=../happydomain-plugin-test-$(PLUGIN_NAME).so
+
+all: $(TARGET)
+
+$(TARGET): *.go
+	go build -buildmode=plugin -o $@ git.happydns.org/happyDomain/plugins/$(PLUGIN_NAME)

plugins/matrix/main.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"git.happydns.org/happyDomain/model"
+)
+
+func NewTestPlugin() (happydns.TestPlugin, error) {
+	return &MatrixTester{
+		TesterURI: "https://federationtester.matrix.org/api/report?server_name=%s",
+	}, nil
+}

plugins/matrix/test.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"strings"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+type MatrixTester struct {
+	TesterURI string
+}
+
+func (p *MatrixTester) PluginEnvName() []string {
+	return []string{
+		"matrixim",
+	}
+}
+
+func (p *MatrixTester) Version() happydns.PluginVersionInfo {
+	return happydns.PluginVersionInfo{
+		Name:    "Matrix Federation Tester",
+		Version: "0.1",
+		AvailableOn: happydns.PluginAvailability{
+			ApplyToService:  true,
+			LimitToServices: []string{"abstract.MatrixIM"},
+		},
+	}
+}
+
+type FederationTesterResponse struct {
+	WellKnownResult struct {
+		Server string `json:"m.server"`
+		Result string `json:"result"`
+	}
+	DNSResult struct {
+		SRVError *struct {
+			Message string
+		}
+	}
+	ConnectionReports map[string]struct {
+		Errors []string
+	}
+	ConnectionErrors map[string]struct {
+		Message string
+	}
+	Version struct {
+		Name    string `json:"name"`
+		Version string `json:"version"`
+	}
+	FederationOK bool `json:"FederationOK"`
+}
+
+func (p *MatrixTester) RunTest(options map[string]interface{}, meta map[string]string) (*happydns.PluginResult, error) {
+	var domain string
+
+	if dn, ok := options["domain"]; ok {
+		domain, _ = dn.(string)
+	} else if origin, ok := options["origin"]; ok {
+		domain, _ = origin.(string)
+	}
+
+	if domain == "" {
+		return nil, fmt.Errorf("domain not defined")
+	}
+
+	domain = strings.TrimSuffix(domain, ".")
+
+	resp, err := http.Get(fmt.Sprintf(p.TesterURI, domain))
+	if err != nil {
+		return nil, fmt.Errorf("unable to perform the test: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 300 {
+		return nil, fmt.Errorf("Sorry, the federation tester is broken. Check on https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
+	}
+
+	var status happydns.PluginResultStatus
+	var statusLine string
+	var federationTest FederationTesterResponse
+
+	err = json.NewDecoder(resp.Body).Decode(&federationTest)
+	if err != nil {
+		log.Printf("Error in check_matrix_federation, when decoding json: %s", err.Error())
+		return nil, fmt.Errorf("sorry, the federation tester is broken. Check on https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
+	}
+
+	if federationTest.FederationOK {
+		status = happydns.PluginResultStatusOK
+		statusLine = "Running " + federationTest.Version.Name + " " + federationTest.Version.Version
+	} else {
+		status = happydns.PluginResultStatusKO
+
+		if federationTest.DNSResult.SRVError != nil && federationTest.WellKnownResult.Result != "" {
+			statusLine = fmt.Sprintf("%s OR %s", federationTest.DNSResult.SRVError.Message, federationTest.WellKnownResult.Result)
+		} else if len(federationTest.ConnectionErrors) > 0 {
+			var msg strings.Builder
+			for srv, cerr := range federationTest.ConnectionErrors {
+				if msg.Len() > 0 {
+					msg.WriteString("; ")
+				}
+				msg.WriteString(srv)
+				msg.WriteString(": ")
+				msg.WriteString(cerr.Message)
+			}
+			statusLine = fmt.Sprintf("Connection errors: %s", msg.String())
+		} else if federationTest.WellKnownResult.Server != strings.TrimSuffix(domain, ".") {
+			statusLine = fmt.Sprintf("Bad homeserver_name: got %s, expected %s.", federationTest.WellKnownResult.Server, strings.TrimSuffix(domain, "."))
+		} else {
+			statusLine = fmt.Sprintf("An unimplemented error occurs. Please report this to happydomain team. But know that federation seems to be broken. Check https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
+		}
+	}
+
+	return &happydns.PluginResult{
+		Status:     status,
+		StatusLine: statusLine,
+		Report:     federationTest,
+	}, nil
+}