1 files changed, 200 insertions, 0 deletions
diff --git a/internal/integration/matrixbot/client.go b/internal/integration/matrixbot/client.go
new file mode 100644
index 00000000..cdc28a8a
--- /dev/null
+++ b/internal/integration/matrixbot/client.go
@@ -0,0 +1,200 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package matrixbot // import "miniflux.app/v2/internal/integration/matrixbot"
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"time"
+
+	"miniflux.app/v2/internal/crypto"
+	"miniflux.app/v2/internal/version"
+)
+
+const defaultClientTimeout = 10 * time.Second
+
+type Client struct {
+	matrixBaseURL string
+}
+
+func NewClient(matrixBaseURL string) *Client {
+	return &Client{matrixBaseURL: matrixBaseURL}
+}
+
+// Specs: https://spec.matrix.org/v1.8/client-server-api/#getwell-knownmatrixclient
+func (c *Client) DiscoverEndpoints() (*DiscoveryEndpointResponse, error) {
+	endpointURL, err := url.JoinPath(c.matrixBaseURL, "/.well-known/matrix/client")
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to join base URL and path: %w", err)
+	}
+
+	request, err := http.NewRequest(http.MethodGet, endpointURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to create request: %v", err)
+	}
+
+	request.Header.Set("Accept", "application/json")
+	request.Header.Set("User-Agent", "Miniflux/"+version.Version)
+
+	httpClient := &http.Client{Timeout: defaultClientTimeout}
+	response, err := httpClient.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to send request: %v", err)
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode >= 400 {
+		return nil, fmt.Errorf("matrix: unexpected response from %s status code is %d", endpointURL, response.StatusCode)
+	}
+
+	var discoveryEndpointResponse DiscoveryEndpointResponse
+	if err := json.NewDecoder(response.Body).Decode(&discoveryEndpointResponse); err != nil {
+		return nil, fmt.Errorf("matrix: unable to decode discovery response: %w", err)
+	}
+
+	return &discoveryEndpointResponse, nil
+}
+
+// Specs https://spec.matrix.org/v1.8/client-server-api/#post_matrixclientv3login
+func (c *Client) Login(homeServerURL, matrixUsername, matrixPassword string) (*LoginResponse, error) {
+	endpointURL, err := url.JoinPath(homeServerURL, "/_matrix/client/v3/login")
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to join base URL and path: %w", err)
+	}
+
+	loginRequest := LoginRequest{
+		Type: "m.login.password",
+		Identifier: UserIdentifier{
+			Type: "m.id.user",
+			User: matrixUsername,
+		},
+		Password: matrixPassword,
+	}
+
+	requestBody, err := json.Marshal(loginRequest)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to encode request body: %v", err)
+	}
+
+	request, err := http.NewRequest(http.MethodPost, endpointURL, bytes.NewReader(requestBody))
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to create request: %v", err)
+	}
+
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Accept", "application/json")
+	request.Header.Set("User-Agent", "Miniflux/"+version.Version)
+
+	httpClient := &http.Client{Timeout: defaultClientTimeout}
+	response, err := httpClient.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to send request: %v", err)
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode >= 400 {
+		return nil, fmt.Errorf("matrix: unexpected response from %s status code is %d", endpointURL, response.StatusCode)
+	}
+
+	var loginResponse LoginResponse
+	if err := json.NewDecoder(response.Body).Decode(&loginResponse); err != nil {
+		return nil, fmt.Errorf("matrix: unable to decode login response: %w", err)
+	}
+
+	return &loginResponse, nil
+}
+
+// Specs https://spec.matrix.org/v1.8/client-server-api/#put_matrixclientv3roomsroomidsendeventtypetxnid
+func (c *Client) SendFormattedTextMessage(homeServerURL, accessToken, roomID, textMessage, formattedMessage string) (*RoomEventResponse, error) {
+	txnID := crypto.GenerateRandomStringHex(10)
+	endpointURL, err := url.JoinPath(homeServerURL, "/_matrix/client/v3/rooms/", roomID, "/send/m.room.message/", txnID)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to join base URL and path: %w", err)
+	}
+
+	messageEvent := TextMessageEventRequest{
+		MsgType:       "m.text",
+		Body:          textMessage,
+		Format:        "org.matrix.custom.html",
+		FormattedBody: formattedMessage,
+	}
+
+	requestBody, err := json.Marshal(messageEvent)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to encode request body: %v", err)
+	}
+
+	request, err := http.NewRequest(http.MethodPut, endpointURL, bytes.NewReader(requestBody))
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to create request: %v", err)
+	}
+
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Accept", "application/json")
+	request.Header.Set("User-Agent", "Miniflux/"+version.Version)
+	request.Header.Set("Authorization", "Bearer "+accessToken)
+
+	httpClient := &http.Client{Timeout: defaultClientTimeout}
+	response, err := httpClient.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("matrix: unable to send request: %v", err)
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode >= 400 {
+		return nil, fmt.Errorf("matrix: unexpected response from %s status code is %d", endpointURL, response.StatusCode)
+	}
+
+	var eventResponse RoomEventResponse
+	if err := json.NewDecoder(response.Body).Decode(&eventResponse); err != nil {
+		return nil, fmt.Errorf("matrix: unable to decode event response: %w", err)
+	}
+
+	return &eventResponse, nil
+}
+
+type HomeServerInformation struct {
+	BaseURL string `json:"base_url"`
+}
+
+type IdentityServerInformation struct {
+	BaseURL string `json:"base_url"`
+}
+
+type DiscoveryEndpointResponse struct {
+	HomeServerInformation     HomeServerInformation     `json:"m.homeserver"`
+	IdentityServerInformation IdentityServerInformation `json:"m.identity_server"`
+}
+
+type UserIdentifier struct {
+	Type string `json:"type"`
+	User string `json:"user"`
+}
+
+type LoginRequest struct {
+	Type       string         `json:"type"`
+	Identifier UserIdentifier `json:"identifier"`
+	Password   string         `json:"password"`
+}
+
+type LoginResponse struct {
+	UserID      string `json:"user_id"`
+	AccessToken string `json:"access_token"`
+	DeviceID    string `json:"device_id"`
+	HomeServer  string `json:"home_server"`
+}
+
+type TextMessageEventRequest struct {
+	MsgType       string `json:"msgtype"`
+	Body          string `json:"body"`
+	Format        string `json:"format"`
+	FormattedBody string `json:"formatted_body"`
+}
+
+type RoomEventResponse struct {
+	EventID string `json:"event_id"`
+}