preview view model

2020-11-27 21:28:54 +01:00
parent 7a6efbcf90
commit ead94695f1
7 changed files with 107 additions and 16 deletions
@@ -0,0 +1,76 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export async function resolveServer(request, baseURL) {
+	if (!baseURL.startsWith("http://") && !baseURL.startsWith("https://")) {
+		baseURL = `https://${baseURL}`;
+	}
+	{
+		const {status, body} = await request(`${baseURL}/.well-known/matrix/client`, {method: "GET"}).response();
+		if (status === 200) {
+			const proposedBaseURL = body?.['m.homeserver']?.base_url;
+			if (typeof proposedBaseURL === "string") {
+				baseURL = proposedBaseURL;
+			}
+		}
+	}
+	{
+		const {status} = await request(`${baseURL}/_matrix/client/versions`, {method: "GET"}).response();
+		if (status !== 200) {
+			throw new Error(`Invalid versions response from ${baseURL}`);
+		}
+	}
+	return new HomeServer(request, baseURL);
+}
+
+export class HomeServer {
+	constructor(request, baseURL) {
+		this._request = request;
+		this.baseURL = baseURL;
+	}
+
+	async getUserProfile(userId) {
+		const {body} = await this._request(`${this.baseURL}/_matrix/client/r0/profile/${userId}`, {method: "GET"}).response();
+		return body;
+	}
+
+	getGroupProfile(groupId) {
+		//`/_matrix/client/r0/groups/${groupId}/profile`
+	}
+
+	getPublicRooms() {
+
+	}
+
+	mxcUrlThumbnail(url, width, height, method) {
+        const parts = parseMxcUrl(url);
+        if (parts) {
+            const [serverName, mediaId] = parts;
+            const httpUrl = `${this.baseURL}/_matrix/media/r0/thumbnail/${encodeURIComponent(serverName)}/${encodeURIComponent(mediaId)}`;
+            return httpUrl + `?width=${width}&height=${height}&method=${method}`;
+        }
+        return null;
+    }
+}
+
+function parseMxcUrl(url) {
+    const prefix = "mxc://";
+    if (url.startsWith(prefix)) {
+        return url.substr(prefix.length).split("/", 2);
+    } else {
+        return null;
+    }
+}
@@ -0,0 +1,58 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {LinkKind} from "../Link.js";
+import {ViewModel} from "../ViewModel.js";
+import {resolveServer} from "./HomeServer.js";
+
+export class PreviewViewModel extends ViewModel {
+	constructor(request, link) {
+		super();
+		this._link = link;
+		this._request = request;
+		this.loading = false;
+		this.name = null;
+		this.avatarURL = null;
+	}
+
+	async load() {
+		this.loading = true;
+		this.emitChange();
+		for (const server of this._link.servers) {
+			try {
+				const homeserver = await resolveServer(this._request, server);
+				switch (this._link.kind) {
+					case LinkKind.User:
+						await this._loadUserPreview(homeserver, this._link.identifier);
+				}
+				// assume we're done if nothing threw
+				break;
+			} catch (err) {
+				continue;
+			}
+		}
+		this.loading = false;
+		this.emitChange();
+	}
+
+	async _loadUserPreview(homeserver, userId) {
+		const profile = await homeserver.getUserProfile(userId);
+		this.name = profile.displayname || userId;
+		this.avatarURL = profile.avatar_url ?
+			homeserver.mxcUrlThumbnail(profile.avatar_url, 64, 64, "crop") :
+			null;
+	}
+}