feat(backend): Override the file URL rendering in AP

.config/docker_example.yml

@@ -178,6 +178,9 @@ id: 'aidx'
 # IP address family used for outgoing request (ipv4, ipv6 or dual)
 #outgoingAddressFamily: ipv4
 
+# Override the file URL rendering in ActivityPub (Object Storage file only)
+#apFileBaseUrl: https://example.com/
+
 # Proxy for HTTP/HTTPS
 #proxy: http://127.0.0.1:3128
 

.config/example.yml

@@ -251,6 +251,9 @@ id: 'aidx'
 # IP address family used for outgoing request (ipv4, ipv6 or dual)
 #outgoingAddressFamily: ipv4
 
+# Override the file URL rendering in ActivityPub (Object Storage file only)
+#apFileBaseUrl: https://example.com/
+
 # Proxy for HTTP/HTTPS
 #proxy: http://127.0.0.1:3128
 

.devcontainer/devcontainer.yml

@@ -171,6 +171,9 @@ id: 'aidx'
 # IP address family used for outgoing request (ipv4, ipv6 or dual)
 #outgoingAddressFamily: ipv4
 
+# Override the file URL rendering in ActivityPub (Object Storage file only)
+#apFileBaseUrl: https://example.com/
+
 # Proxy for HTTP/HTTPS
 #proxy: http://127.0.0.1:3128
 

chart/files/default.yml

@@ -192,6 +192,9 @@ id: "aidx"
 # IP address family used for outgoing request (ipv4, ipv6 or dual)
 #outgoingAddressFamily: ipv4
 
+# Override the file URL rendering in ActivityPub (Object Storage file only)
+#apFileBaseUrl: https://example.com/
+
 # Proxy for HTTP/HTTPS
 #proxy: http://127.0.0.1:3128
 

packages/backend/src/config.ts

@@ -62,6 +62,8 @@ type Source = {
 
 	publishTarballInsteadOfProvideRepositoryUrl?: boolean;
 
+	apFileBaseUrl?: string;
+
 	proxy?: string;
 	proxySmtp?: string;
 	proxyBypassHosts?: string[];
@@ -129,6 +131,7 @@ export type Config = {
 		index: string;
 		scope?: 'local' | 'global' | string[];
 	} | undefined;
+	apFileBaseUrl: string | undefined;
 	proxy: string | undefined;
 	proxySmtp: string | undefined;
 	proxyBypassHosts: string[] | undefined;
@@ -246,6 +249,7 @@ export function loadConfig(): Config {
 		sentryForBackend: config.sentryForBackend,
 		sentryForFrontend: config.sentryForFrontend,
 		id: config.id,
+		apFileBaseUrl: config.apFileBaseUrl,
 		proxy: config.proxy,
 		proxySmtp: config.proxySmtp,
 		proxyBypassHosts: config.proxyBypassHosts,

packages/backend/src/core/activitypub/ApRendererService.ts

@@ -164,7 +164,7 @@ export class ApRendererService {
 		return {
 			type: 'Document',
 			mediaType: file.webpublicType ?? file.type,
-			url: this.driveFileEntityService.getPublicUrl(file),
+			url: this.driveFileEntityService.getPublicUrl(file, undefined, true),
 			name: file.comment,
 			sensitive: file.isSensitive,
 		};
@@ -244,7 +244,7 @@ export class ApRendererService {
 	public renderImage(file: MiDriveFile): IApImage {
 		return {
 			type: 'Image',
-			url: this.driveFileEntityService.getPublicUrl(file),
+			url: this.driveFileEntityService.getPublicUrl(file, undefined, true),
 			sensitive: file.isSensitive,
 			name: file.comment,
 		};

packages/backend/src/core/activitypub/models/ApPersonService.ts

@@ -256,12 +256,12 @@ export class ApPersonService implements OnModuleInit {
 		return {
 			...( avatar ? {
 				avatarId: avatar.id,
-				avatarUrl: avatar.url ? this.driveFileEntityService.getPublicUrl(avatar, 'avatar') : null,
+				avatarUrl: avatar.url ? this.driveFileEntityService.getPublicUrl(avatar, 'avatar', true) : null,
 				avatarBlurhash: avatar.blurhash,
 			} : {}),
 			...( banner ? {
 				bannerId: banner.id,
-				bannerUrl: banner.url ? this.driveFileEntityService.getPublicUrl(banner) : null,
+				bannerUrl: banner.url ? this.driveFileEntityService.getPublicUrl(banner, undefined, true) : null,
 				bannerBlurhash: banner.blurhash,
 			} : {}),
 		};

packages/backend/src/core/entities/DriveFileEntityService.ts

@@ -108,7 +108,7 @@ export class DriveFileEntityService {
 	}
 
 	@bindThis
-	public getPublicUrl(file: MiDriveFile, mode?: 'avatar'): string { // static = thumbnail
+	public getPublicUrl(file: MiDriveFile, mode?: 'avatar', ap?: boolean): string { // static = thumbnail
 		// リモートかつメディアプロキシ
 		if (file.uri != null && file.userHost != null && this.config.externalMediaProxyEnabled) {
 			return this.getProxiedUrl(file.uri, mode);
@@ -130,6 +130,16 @@ export class DriveFileEntityService {
 		if (mode === 'avatar') {
 			return this.getProxiedUrl(url, 'avatar');
 		}
+
+		if (ap && this.config.apFileBaseUrl) {
+			const baseUrl = this.config.apFileBaseUrl;
+			const isValidBaseUrl = /^https?:\/\/[\w.-]+\.[a-zA-Z]{2,}(\/.*)?$/i.test(baseUrl);
+			if (isValidBaseUrl) {
+				const trimmedBaseUrl = baseUrl.replace(/\/$/, '');
+				return url.replace(/^https?:\/\/[\w.-]+\.[a-zA-Z]{2,}/, trimmedBaseUrl);
+			}
+		}
+
 		return url;
 	}