From c471503ede9aad91193ff6f93966196e6aff15d6 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Wed, 4 Jan 2023 03:38:19 +0300
Subject: OAuth authentication for Mastodon and ActivityPub C2S

---
 src/main/java/com/juick/www/api/Mastodon.java | 118 ++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 src/main/java/com/juick/www/api/Mastodon.java

(limited to 'src/main/java/com/juick/www/api/Mastodon.java')

diff --git a/src/main/java/com/juick/www/api/Mastodon.java b/src/main/java/com/juick/www/api/Mastodon.java
new file mode 100644
index 00000000..69f0f4f6
--- /dev/null
+++ b/src/main/java/com/juick/www/api/Mastodon.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2008-2023, Juick
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.juick.www.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.juick.model.User;
+import com.juick.service.UserService;
+import com.juick.www.WebApp;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.MediaType;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
+import org.springframework.security.oauth2.server.authorization.client.RegisteredClient;
+import org.springframework.security.oauth2.server.authorization.client.RegisteredClientRepository;
+import org.springframework.security.oauth2.server.authorization.settings.ClientSettings;
+import org.springframework.web.bind.annotation.*;
+
+import javax.inject.Inject;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.UUID;
+
+@RestController
+public class Mastodon {
+    @Value("${web_domain:localhost}")
+    private String domain;
+    @Inject
+    WebApp webApp;
+    @Inject
+    UserService userService;
+    @Inject
+    RegisteredClientRepository registeredClientRepository;
+
+    public record ApplicationRequest(@JsonProperty("client_name") String clientName,
+                                     @JsonProperty("redirect_uris") String redirectUris,
+                                     @JsonProperty("scopes") String scopes) {
+    }
+
+    public record ApplicationResponse(String id,
+                                      @JsonProperty("client_name") String name,
+                                      @JsonProperty("redirect_uri") String redirectUri,
+                                      @JsonProperty("client_id") String clientId,
+                                      @JsonProperty("client_secret") String clientSecret) {
+    }
+
+    public record CredentialAccount(String id, String username, String acct,
+                                    @JsonProperty("display_name") String displayName,
+                                    @JsonProperty("followers_count") Integer followersCount,
+                                    @JsonProperty("following_count") Integer followingCount,
+                                    String avatar) {
+
+    }
+    private Collection<String> parseScopes(String s) {
+        return s != null ? Arrays.asList(s.split(" ")) : Collections.emptyList();
+    }
+
+    @PostMapping(value = "/api/v1/apps", consumes = { MediaType.APPLICATION_JSON_VALUE })
+    public ApplicationResponse apps(@RequestBody ApplicationRequest application) {
+        return apps(application.clientName(), application.redirectUris(), application.scopes());
+    }
+
+    @PostMapping(value = "/api/v1/apps", consumes = { MediaType.APPLICATION_FORM_URLENCODED_VALUE, MediaType.MULTIPART_FORM_DATA_VALUE })
+    public ApplicationResponse apps(@RequestParam("client_name") String clientName,
+                                    @RequestParam("redirect_uris") String redirectUris,
+                                    @RequestParam("scopes") String scopes) {
+        var secret = UUID.randomUUID().toString();
+        RegisteredClient registeredClient = RegisteredClient.withId(UUID.randomUUID().toString())
+                .clientId(UUID.randomUUID().toString())
+                .clientSecret("{noop}" + secret)
+                .clientName(clientName)
+                .clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_POST)
+                .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
+                .redirectUri(redirectUris)
+                .scopes((coll) -> coll.addAll(parseScopes(scopes)))
+                .clientSettings(ClientSettings.builder().requireAuthorizationConsent(true).build()).build();
+        registeredClientRepository.save(registeredClient);
+        return new ApplicationResponse(
+                registeredClient.getId(),
+                registeredClient.getClientName(),
+                String.join(",", registeredClient.getRedirectUris()),
+                registeredClient.getClientId(),
+                secret
+        );
+    }
+    public record Instance(String domain) {}
+    @GetMapping("/api/v1/instance")
+    public Instance getInstance() {
+        return new Instance(domain);
+    }
+    @GetMapping("/api/v1/accounts/verify_credentials")
+    public CredentialAccount account(@ModelAttribute User visitor) {
+        return new CredentialAccount(
+                String.valueOf(visitor.getUid()),
+                visitor.getName(),
+                visitor.getName(),
+                visitor.getFullName(),
+                userService.getUserReaders(visitor.getUid()).size(),
+                userService.getUserFriends(visitor.getUid()).size(),
+                webApp.getAvatarUrl(visitor)
+        );
+    }
+}
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