feat: implemented link previews (server files) (#3073)

* feat: implmented link previews (server files)

* chore: updated variable name

* chore: renamed service file from `metadata_service.go` to `link_service.go`

* fix: passing errors

* fix: fixed linter warnong about `ctx`

server/route/api/v2/apidocs.swagger.yaml

@@ -7,6 +7,7 @@ tags:
   - name: UserService
   - name: AuthService
   - name: InboxService
+  - name: LinkService
   - name: ResourceService
   - name: MemoService
   - name: TagService
@@ -171,16 +172,12 @@ paths:
           type: integer
           format: int32
         - name: pageToken
-          description: |-
-            A page token, received from a previous `ListMemos` call.
-            Provide this to retrieve the subsequent page.
+          description: "A page token, received from a previous `ListMemos` call.\r\nProvide this to retrieve the subsequent page."
           in: query
           required: false
           type: string
         - name: filter
-          description: |-
-            Filter is used to filter memos returned in the list.
-            Format: "creator == users/{username} && visibilities == ['PUBLIC', 'PROTECTED']"
+          description: "Filter is used to filter memos returned in the list.\r\nFormat: \"creator == users/{username} && visibilities == ['PUBLIC', 'PROTECTED']\""
           in: query
           required: false
           type: string
@@ -241,17 +238,12 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            name is the name of the user to get stats for.
-            Format: users/{username}
+          description: "name is the name of the user to get stats for.\r\nFormat: users/{username}"
           in: query
           required: false
           type: string
         - name: timezone
-          description: |-
-            timezone location
-            Format: uses tz identifier
-            https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+          description: "timezone location\r\nFormat: uses tz identifier\r\nhttps://en.wikipedia.org/wiki/List_of_tz_database_time_zones"
           in: query
           required: false
           type: string
@@ -583,9 +575,7 @@ paths:
                 $ref: '#/definitions/apiv2RowStatus'
               creator:
                 type: string
-                title: |-
-                  The name of the creator.
-                  Format: users/{username}
+                title: "The name of the creator.\r\nFormat: users/{username}"
               creatorId:
                 type: integer
                 format: int32
@@ -649,6 +639,25 @@ paths:
           type: string
       tags:
         - MemoService
+  /api/v2/metadata:
+    get:
+      operationId: LinkService_GetLinkMetadata
+      responses:
+        "200":
+          description: A successful response.
+          schema:
+            $ref: '#/definitions/v2GetLinkMetadataResponse'
+        default:
+          description: An unexpected error response.
+          schema:
+            $ref: '#/definitions/googlerpcStatus'
+      parameters:
+        - name: url
+          in: query
+          required: false
+          type: string
+      tags:
+        - LinkService
   /api/v2/resources:
     get:
       summary: ListResources lists all resources.
@@ -818,9 +827,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: user
-          description: |-
-            The creator of tags.
-            Format: users/{username}
+          description: "The creator of tags.\r\nFormat: users/{username}"
           in: query
           required: false
           type: string
@@ -844,9 +851,7 @@ paths:
           required: false
           type: string
         - name: tag.creator
-          description: |-
-            The creator of tags.
-            Format: users/{username}
+          description: "The creator of tags.\r\nFormat: users/{username}"
           in: query
           required: false
           type: string
@@ -886,9 +891,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: user
-          description: |-
-            The creator of tags.
-            Format: users/{username}
+          description: "The creator of tags.\r\nFormat: users/{username}"
           in: query
           required: false
           type: string
@@ -911,9 +914,7 @@ paths:
         - TagService
   /api/v2/tags:rename:
     patch:
-      summary: |-
-        RenameTag renames a tag.
-        All related memos will be updated.
+      summary: "RenameTag renames a tag.\r\nAll related memos will be updated."
       operationId: TagService_RenameTag
       responses:
         "200":
@@ -926,9 +927,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: user
-          description: |-
-            The creator of tags.
-            Format: users/{username}
+          description: "The creator of tags.\r\nFormat: users/{username}"
           in: query
           required: false
           type: string
@@ -1131,9 +1130,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The resource name of the workspace setting.
-            Format: settings/{setting}
+          description: "The resource name of the workspace setting.\r\nFormat: settings/{setting}"
           in: path
           required: true
           type: string
@@ -1155,9 +1152,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: setting.name
-          description: |-
-            name is the name of the setting.
-            Format: settings/{setting}
+          description: "name is the name of the setting.\r\nFormat: settings/{setting}"
           in: path
           required: true
           type: string
@@ -1190,9 +1185,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: inbox.name
-          description: |-
-            The name of the inbox.
-            Format: inboxes/{uid}
+          description: "The name of the inbox.\r\nFormat: inboxes/{uid}"
           in: path
           required: true
           type: string
@@ -1236,9 +1229,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name_1
-          description: |-
-            The name of the inbox to delete.
-            Format: inboxes/{uid}
+          description: "The name of the inbox to delete.\r\nFormat: inboxes/{uid}"
           in: path
           required: true
           type: string
@@ -1260,9 +1251,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1283,9 +1272,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1307,9 +1294,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1330,9 +1315,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1359,9 +1342,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1388,9 +1369,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1412,9 +1391,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: setting.name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1454,9 +1431,7 @@ paths:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
         - name: user.name
-          description: |-
-            The name of the user.
-            Format: users/{username}
+          description: "The name of the user.\r\nFormat: users/{username}"
           in: path
           required: true
           type: string
@@ -1608,9 +1583,7 @@ definitions:
     properties:
       name:
         type: string
-        title: |-
-          The name of the user.
-          Format: users/{username}
+        title: "The name of the user.\r\nFormat: users/{username}"
       locale:
         type: string
         description: The preferred locale of the user.
@@ -1667,9 +1640,7 @@ definitions:
     properties:
       name:
         type: string
-        title: |-
-          name is the name of the setting.
-          Format: settings/{setting}
+        title: "name is the name of the setting.\r\nFormat: settings/{setting}"
       generalSetting:
         $ref: '#/definitions/apiv2WorkspaceGeneralSetting'
         description: general_setting is the general setting of workspace.
@@ -1788,6 +1759,11 @@ definitions:
     properties:
       user:
         $ref: '#/definitions/v2User'
+  v2GetLinkMetadataResponse:
+    type: object
+    properties:
+      metadata:
+        $ref: '#/definitions/v2Metadata'
   v2GetMemoByNameResponse:
     type: object
     properties:
@@ -1823,9 +1799,7 @@ definitions:
         additionalProperties:
           type: integer
           format: int32
-        description: |-
-          stats is the stats of memo creating/updating activities.
-          key is the year-month-day string. e.g. "2020-01-01".
+        description: "stats is the stats of memo creating/updating activities.\r\nkey is the year-month-day string. e.g. \"2020-01-01\"."
   v2GetUserResponse:
     type: object
     properties:
@@ -1856,9 +1830,7 @@ definitions:
     properties:
       name:
         type: string
-        title: |-
-          The name of the inbox.
-          Format: inboxes/{uid}
+        title: "The name of the inbox.\r\nFormat: inboxes/{uid}"
       sender:
         type: string
         title: 'Format: users/{username}'
@@ -1939,9 +1911,7 @@ definitions:
           $ref: '#/definitions/v2Memo'
       nextPageToken:
         type: string
-        description: |-
-          A token, which can be sent as `page_token` to retrieve the next page.
-          If this field is omitted, there are no subsequent pages.
+        description: "A token, which can be sent as `page_token` to retrieve the next page.\r\nIf this field is omitted, there are no subsequent pages."
   v2ListResourcesResponse:
     type: object
     properties:
@@ -1996,9 +1966,7 @@ definitions:
         $ref: '#/definitions/apiv2RowStatus'
       creator:
         type: string
-        title: |-
-          The name of the creator.
-          Format: users/{username}
+        title: "The name of the creator.\r\nFormat: users/{username}"
       creatorId:
         type: integer
         format: int32
@@ -2057,6 +2025,16 @@ definitions:
       - REFERENCE
       - COMMENT
     default: TYPE_UNSPECIFIED
+  v2Metadata:
+    type: object
+    properties:
+      title:
+        type: string
+      description:
+        type: string
+      image:
+        type: string
+    title: Metadata message
   v2RenameTagResponse:
     type: object
     properties:
@@ -2120,9 +2098,7 @@ definitions:
         type: string
       creator:
         type: string
-        title: |-
-          The creator of tags.
-          Format: users/{username}
+        title: "The creator of tags.\r\nFormat: users/{username}"
   v2UpdateInboxResponse:
     type: object
     properties:
@@ -2173,9 +2149,7 @@ definitions:
     properties:
       name:
         type: string
-        title: |-
-          The name of the user.
-          Format: users/{username}
+        title: "The name of the user.\r\nFormat: users/{username}"
       id:
         type: integer
         format: int32

server/route/api/v2/link_service.go

@@ -0,0 +1,25 @@
+package v2
+
+import (
+	"context"
+
+	getter "github.com/usememos/memos/plugin/http-getter"
+	apiv2pb "github.com/usememos/memos/proto/gen/api/v2"
+)
+
+func (*APIV2Service) GetMetadata(_ context.Context, request *apiv2pb.GetLinkMetadataRequest) (*apiv2pb.GetLinkMetadataResponse, error) {
+	urlStr := request.Url
+
+	htmlMeta, err := getter.GetHTMLMeta(urlStr)
+	if err != nil {
+		return nil, err
+	}
+
+	return &apiv2pb.GetLinkMetadataResponse{
+		Metadata: &apiv2pb.Metadata{
+			Title:       htmlMeta.Title,
+			Description: htmlMeta.Description,
+			Image:       htmlMeta.Image,
+		},
+	}, nil
+}

server/route/api/v2/v2.go

@@ -30,6 +30,7 @@ type APIV2Service struct {
 	apiv2pb.UnimplementedInboxServiceServer
 	apiv2pb.UnimplementedActivityServiceServer
 	apiv2pb.UnimplementedWebhookServiceServer
+	apiv2pb.UnimplementedLinkServiceServer
 
 	Secret  string
 	Profile *profile.Profile
@@ -66,6 +67,7 @@ func NewAPIV2Service(secret string, profile *profile.Profile, store *store.Store
 	apiv2pb.RegisterInboxServiceServer(grpcServer, apiv2Service)
 	apiv2pb.RegisterActivityServiceServer(grpcServer, apiv2Service)
 	apiv2pb.RegisterWebhookServiceServer(grpcServer, apiv2Service)
+	apiv2pb.RegisterLinkServiceServer(grpcServer, apiv2Service)
 	reflection.Register(grpcServer)
 
 	return apiv2Service
@@ -119,6 +121,9 @@ func (s *APIV2Service) RegisterGateway(ctx context.Context, e *echo.Echo) error
 	if err := apiv2pb.RegisterWebhookServiceHandler(context.Background(), gwMux, conn); err != nil {
 		return err
 	}
+	if err := apiv2pb.RegisterLinkServiceHandler(context.Background(), gwMux, conn); err != nil {
+		return err
+	}
 	e.Any("/api/v2/*", echo.WrapHandler(gwMux))
 
 	// GRPC web proxy.