feat(wopi): change doc preview config based on WOPI discovery results

pkg/wopi/wopi.go

@@ -6,6 +6,7 @@ import (
 	model "github.com/cloudreve/Cloudreve/v3/models"
 	"github.com/cloudreve/Cloudreve/v3/pkg/cache"
 	"github.com/cloudreve/Cloudreve/v3/pkg/request"
+	"github.com/cloudreve/Cloudreve/v3/pkg/util"
 	"net/url"
 	"path"
 	"strings"
@@ -13,11 +14,18 @@ import (
 )
 
 type Client interface {
+	// NewSession creates a new document session with access token.
+	NewSession(user *model.User, file *model.File, action ActonType) (*Session, error)
+	// AvailableExts returns a list of file extensions that are supported by WOPI.
+	AvailableExts() []string
 }
 
 var (
 	ErrActionNotSupported = errors.New("action not supported by current wopi endpoint")
 
+	Default   Client
+	DefaultMu sync.Mutex
+
 	queryPlaceholders = map[string]string{
 		"BUSINESS_USER":           "",
 		"DC_LLCC":                 "lng",
@@ -38,6 +46,24 @@ const (
 	wopiSrcPlaceholder = "WOPI_SOURCE"
 )
 
+// Init initializes a new global WOPI client.
+func Init() {
+	settings := model.GetSettingByNames("wopi_endpoint", "wopi_enabled")
+	if !model.IsTrueVal(settings["wopi_enabled"]) {
+		return
+	}
+
+	wopiClient, err := NewClient(settings["wopi_endpoint"], cache.Store, request.NewClient())
+	if err != nil {
+		util.Log().Error("Failed to initialize WOPI client: %s", err)
+		return
+	}
+
+	DefaultMu.Lock()
+	Default = wopiClient
+	DefaultMu.Unlock()
+}
+
 type client struct {
 	cache cache.Driver
 	http  request.Client
@@ -53,6 +79,21 @@ type config struct {
 	discoveryEndpoint *url.URL
 }
 
+func NewClient(endpoint string, cache cache.Driver, http request.Client) (Client, error) {
+	endpointUrl, err := url.Parse(endpoint)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse WOPI endpoint: %s", err)
+	}
+
+	return &client{
+		cache: cache,
+		http:  http,
+		config: config{
+			discoveryEndpoint: endpointUrl,
+		},
+	}, nil
+}
+
 func (c *client) NewSession(user *model.User, file *model.File, action ActonType) (*Session, error) {
 	if err := c.checkDiscovery(); err != nil {
 		return nil, err
@@ -79,6 +120,8 @@ func (c *client) NewSession(user *model.User, file *model.File, action ActonType
 	return nil, nil
 }
 
+// Replace query parameters in action URL template. Some placeholders need to be replaced
+// at the frontend, e.g. `THEME_ID`.
 func generateActionUrl(src string, fileSrc string) (*url.URL, error) {
 	src = strings.ReplaceAll(src, "<", "")
 	src = strings.ReplaceAll(src, ">", "")