diff --git a/keyserver/src/updaters/thread-updaters.js b/keyserver/src/updaters/thread-updaters.js
index 9aded83cd..6af5a4e22 100644
--- a/keyserver/src/updaters/thread-updaters.js
+++ b/keyserver/src/updaters/thread-updaters.js
@@ -1,966 +1,968 @@
 // @flow
 
 import { getRolePermissionBlobs } from 'lib/permissions/thread-permissions.js';
 import { filteredThreadIDs } from 'lib/selectors/calendar-filter-selectors.js';
-import {
-  getPinnedContentFromMessage,
-  isInvalidPinSource,
-} from 'lib/shared/message-utils.js';
+import { getPinnedContentFromMessage } from 'lib/shared/message-utils.js';
 import {
   threadHasAdminRole,
   roleIsAdminRole,
   viewerIsMember,
   getThreadTypeParentRequirement,
 } from 'lib/shared/thread-utils.js';
 import type { Shape } from 'lib/types/core.js';
 import { messageTypes } from 'lib/types/message-types-enum.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
 import {
   type RoleChangeRequest,
   type ChangeThreadSettingsResult,
   type RemoveMembersRequest,
   type LeaveThreadRequest,
   type LeaveThreadResult,
   type UpdateThreadRequest,
   type ServerThreadJoinRequest,
   type ThreadJoinResult,
   type ToggleMessagePinRequest,
   type ToggleMessagePinResult,
 } from 'lib/types/thread-types.js';
 import { updateTypes } from 'lib/types/update-types-enum.js';
 import { ServerError } from 'lib/utils/errors.js';
 import { promiseAll } from 'lib/utils/promises.js';
 import { firstLine } from 'lib/utils/string-utils.js';
+import { canToggleMessagePin } from 'lib/utils/toggle-pin-utils.js';
 import { validChatNameRegex } from 'lib/utils/validation-utils.js';
 
 import { reportLinkUsage } from './link-updaters.js';
 import { updateRoles } from './role-updaters.js';
 import {
   changeRole,
   recalculateThreadPermissions,
   commitMembershipChangeset,
 } from './thread-permission-updaters.js';
 import createMessages from '../creators/message-creator.js';
 import { createUpdates } from '../creators/update-creator.js';
 import { dbQuery, SQL } from '../database/database.js';
 import { checkIfInviteLinkIsValid } from '../fetchers/link-fetchers.js';
 import { fetchMessageInfoByID } from '../fetchers/message-fetchers.js';
 import {
   fetchThreadInfos,
   fetchServerThreadInfos,
   determineThreadAncestry,
+  rawThreadInfosFromServerThreadInfos,
 } from '../fetchers/thread-fetchers.js';
 import {
   checkThreadPermission,
   viewerIsMember as fetchViewerIsMember,
   checkThread,
   validateCandidateMembers,
 } from '../fetchers/thread-permission-fetchers.js';
 import {
   verifyUserIDs,
   verifyUserOrCookieIDs,
 } from '../fetchers/user-fetchers.js';
 import { handleAsyncPromise } from '../responders/handlers.js';
 import type { Viewer } from '../session/viewer.js';
 import RelationshipChangeset from '../utils/relationship-changeset.js';
 
 type UpdateRoleOptions = {
   +silenceNewMessages?: boolean,
   +forcePermissionRecalculation?: boolean,
 };
 async function updateRole(
   viewer: Viewer,
   request: RoleChangeRequest,
   options?: UpdateRoleOptions,
 ): Promise<ChangeThreadSettingsResult> {
   const silenceNewMessages = options?.silenceNewMessages;
   const forcePermissionRecalculation = options?.forcePermissionRecalculation;
 
   if (!viewer.loggedIn) {
     throw new ServerError('not_logged_in');
   }
 
   const [memberIDs, hasPermission, fetchThreadResult] = await Promise.all([
     verifyUserIDs(request.memberIDs),
     checkThreadPermission(
       viewer,
       request.threadID,
       threadPermissions.CHANGE_ROLE,
     ),
     fetchThreadInfos(viewer, { threadID: request.threadID }),
   ]);
   if (memberIDs.length === 0) {
     throw new ServerError('invalid_parameters');
   }
   if (!hasPermission) {
     throw new ServerError('invalid_credentials');
   }
 
   const threadInfo = fetchThreadResult.threadInfos[request.threadID];
   if (!threadInfo) {
     throw new ServerError('invalid_parameters');
   }
 
   const adminRoleID = Object.keys(threadInfo.roles).find(
     roleID => threadInfo.roles[roleID].name === 'Admins',
   );
 
   // Ensure that there will always still be at least one admin in a community
   if (adminRoleID) {
     const memberRoles = memberIDs.map(
       memberID =>
         threadInfo.members.find(member => member.id === memberID)?.role,
     );
 
     const communityAdminsCount = threadInfo.members.filter(
       member => member.role === adminRoleID,
     ).length;
 
     const changedAdminsCount = memberRoles.filter(
       memberRole => memberRole === adminRoleID,
     ).length;
 
     if (changedAdminsCount >= communityAdminsCount) {
       throw new ServerError('invalid_parameters');
     }
   }
 
   const query = SQL`
     SELECT user, role
     FROM memberships
     WHERE user IN (${memberIDs})
       AND thread = ${request.threadID}
   `;
   const [result] = await dbQuery(query);
 
   let nonMemberUser = false;
   let numResults = 0;
   for (const row of result) {
     if (row.role <= 0) {
       nonMemberUser = true;
       break;
     }
     numResults++;
   }
   if (nonMemberUser || numResults < memberIDs.length) {
     throw new ServerError('invalid_parameters');
   }
 
   const changeset = await changeRole(
     request.threadID,
     memberIDs,
     request.role,
     {
       forcePermissionRecalculation: !!forcePermissionRecalculation,
     },
   );
 
   const { viewerUpdates } = await commitMembershipChangeset(
     viewer,
     changeset,
     forcePermissionRecalculation
       ? { changedThreadIDs: new Set([request.threadID]) }
       : undefined,
   );
 
   let newMessageInfos = [];
   if (!silenceNewMessages) {
     const messageData = {
       type: messageTypes.CHANGE_ROLE,
       threadID: request.threadID,
       creatorID: viewer.userID,
       time: Date.now(),
       userIDs: memberIDs,
       newRole: request.role,
       roleName: threadInfo.roles[request.role].name,
     };
     newMessageInfos = await createMessages(viewer, [messageData]);
   }
 
   return { updatesResult: { newUpdates: viewerUpdates }, newMessageInfos };
 }
 
 async function removeMembers(
   viewer: Viewer,
   request: RemoveMembersRequest,
 ): Promise<ChangeThreadSettingsResult> {
   const viewerID = viewer.userID;
   if (request.memberIDs.includes(viewerID)) {
     throw new ServerError('invalid_parameters');
   }
 
   const [memberIDs, hasPermission] = await Promise.all([
     verifyUserOrCookieIDs(request.memberIDs),
     checkThreadPermission(
       viewer,
       request.threadID,
       threadPermissions.REMOVE_MEMBERS,
     ),
   ]);
   if (memberIDs.length === 0) {
     throw new ServerError('invalid_parameters');
   }
   if (!hasPermission) {
     throw new ServerError('invalid_credentials');
   }
 
   const query = SQL`
     SELECT m.user, m.role, t.default_role
     FROM memberships m
     LEFT JOIN threads t ON t.id = m.thread
     WHERE m.user IN (${memberIDs})
       AND m.thread = ${request.threadID}
   `;
   const [result] = await dbQuery(query);
 
   let nonDefaultRoleUser = false;
   const actualMemberIDs = [];
   for (const row of result) {
     if (row.role <= 0) {
       continue;
     }
     actualMemberIDs.push(row.user.toString());
     if (row.role !== row.default_role) {
       nonDefaultRoleUser = true;
     }
   }
 
   if (nonDefaultRoleUser) {
     const hasChangeRolePermission = await checkThreadPermission(
       viewer,
       request.threadID,
       threadPermissions.CHANGE_ROLE,
     );
     if (!hasChangeRolePermission) {
       throw new ServerError('invalid_credentials');
     }
   }
 
   const changeset = await changeRole(request.threadID, actualMemberIDs, 0);
   const { viewerUpdates } = await commitMembershipChangeset(viewer, changeset);
 
   const newMessageInfos = await (async () => {
     if (actualMemberIDs.length === 0) {
       return [];
     }
     const messageData = {
       type: messageTypes.REMOVE_MEMBERS,
       threadID: request.threadID,
       creatorID: viewerID,
       time: Date.now(),
       removedUserIDs: actualMemberIDs,
     };
     return await createMessages(viewer, [messageData]);
   })();
 
   return { updatesResult: { newUpdates: viewerUpdates }, newMessageInfos };
 }
 
 async function leaveThread(
   viewer: Viewer,
   request: LeaveThreadRequest,
 ): Promise<LeaveThreadResult> {
   if (!viewer.loggedIn) {
     throw new ServerError('not_logged_in');
   }
 
   const [fetchThreadResult, hasPermission] = await Promise.all([
     fetchThreadInfos(viewer, { threadID: request.threadID }),
     checkThreadPermission(
       viewer,
       request.threadID,
       threadPermissions.LEAVE_THREAD,
     ),
   ]);
 
   const threadInfo = fetchThreadResult.threadInfos[request.threadID];
 
   if (!viewerIsMember(threadInfo)) {
     return {
       updatesResult: { newUpdates: [] },
     };
   }
 
   if (!hasPermission) {
     throw new ServerError('invalid_parameters');
   }
 
   const viewerID = viewer.userID;
   if (threadHasAdminRole(threadInfo)) {
     let otherUsersExist = false;
     let otherAdminsExist = false;
     for (const member of threadInfo.members) {
       const role = member.role;
       if (!role || member.id === viewerID) {
         continue;
       }
       otherUsersExist = true;
       if (roleIsAdminRole(threadInfo.roles[role])) {
         otherAdminsExist = true;
         break;
       }
     }
     if (otherUsersExist && !otherAdminsExist) {
       throw new ServerError('invalid_parameters');
     }
   }
 
   const changeset = await changeRole(request.threadID, [viewerID], 0);
   const { viewerUpdates } = await commitMembershipChangeset(viewer, changeset);
 
   const messageData = {
     type: messageTypes.LEAVE_THREAD,
     threadID: request.threadID,
     creatorID: viewerID,
     time: Date.now(),
   };
   await createMessages(viewer, [messageData]);
 
   return { updatesResult: { newUpdates: viewerUpdates } };
 }
 
 type UpdateThreadOptions = Shape<{
   +forceAddMembers: boolean,
   +forceUpdateRoot: boolean,
   +silenceMessages: boolean,
   +ignorePermissions: boolean,
 }>;
 
 async function updateThread(
   viewer: Viewer,
   request: UpdateThreadRequest,
   options?: UpdateThreadOptions,
 ): Promise<ChangeThreadSettingsResult> {
   if (!viewer.loggedIn) {
     throw new ServerError('not_logged_in');
   }
   const forceAddMembers = options?.forceAddMembers ?? false;
   const forceUpdateRoot = options?.forceUpdateRoot ?? false;
   const silenceMessages = options?.silenceMessages ?? false;
   const ignorePermissions =
     (options?.ignorePermissions && viewer.isScriptViewer) ?? false;
   const validationPromises = {};
 
   const changedFields = {};
   const sqlUpdate = {};
   const untrimmedName = request.changes.name;
   if (untrimmedName !== undefined && untrimmedName !== null) {
     const name = firstLine(untrimmedName);
     if (name.search(validChatNameRegex) === -1) {
       throw new ServerError('invalid_chat_name');
     }
     changedFields.name = name;
     sqlUpdate.name = name ?? null;
   }
   const { description } = request.changes;
   if (description !== undefined && description !== null) {
     changedFields.description = description;
     sqlUpdate.description = description ?? null;
   }
   if (request.changes.color) {
     const color = request.changes.color.toLowerCase();
     changedFields.color = color;
     sqlUpdate.color = color;
   }
   const { parentThreadID } = request.changes;
   if (parentThreadID !== undefined) {
     // TODO some sort of message when this changes
     sqlUpdate.parent_thread_id = parentThreadID;
   }
 
   const { avatar } = request.changes;
   if (avatar) {
     changedFields.avatar =
       avatar.type !== 'remove' ? JSON.stringify(avatar) : '';
     sqlUpdate.avatar = avatar.type !== 'remove' ? JSON.stringify(avatar) : null;
   }
 
   const threadType = request.changes.type;
   if (threadType !== null && threadType !== undefined) {
     changedFields.type = threadType;
     sqlUpdate.type = threadType;
   }
 
   if (
     !ignorePermissions &&
     threadType !== null &&
     threadType !== undefined &&
     threadType !== threadTypes.COMMUNITY_OPEN_SUBTHREAD &&
     threadType !== threadTypes.COMMUNITY_SECRET_SUBTHREAD
   ) {
     throw new ServerError('invalid_parameters');
   }
 
   const newMemberIDs =
     request.changes.newMemberIDs && request.changes.newMemberIDs.length > 0
       ? [...new Set(request.changes.newMemberIDs)]
       : null;
 
   if (
     Object.keys(sqlUpdate).length === 0 &&
     !newMemberIDs &&
     !forceUpdateRoot
   ) {
     throw new ServerError('invalid_parameters');
   }
 
   validationPromises.serverThreadInfos = fetchServerThreadInfos({
     threadID: request.threadID,
   });
 
   validationPromises.hasNecessaryPermissions = (async () => {
     if (ignorePermissions) {
       return;
     }
     const checks = [];
     if (sqlUpdate.name !== undefined) {
       checks.push({
         check: 'permission',
         permission: threadPermissions.EDIT_THREAD_NAME,
       });
     }
     if (sqlUpdate.description !== undefined) {
       checks.push({
         check: 'permission',
         permission: threadPermissions.EDIT_THREAD_DESCRIPTION,
       });
     }
     if (sqlUpdate.color !== undefined) {
       checks.push({
         check: 'permission',
         permission: threadPermissions.EDIT_THREAD_COLOR,
       });
     }
     if (sqlUpdate.avatar !== undefined) {
       checks.push({
         check: 'permission',
         permission: threadPermissions.EDIT_THREAD_AVATAR,
       });
     }
     if (parentThreadID !== undefined || sqlUpdate.type !== undefined) {
       checks.push({
         check: 'permission',
         permission: threadPermissions.EDIT_PERMISSIONS,
       });
     }
     if (newMemberIDs) {
       checks.push({
         check: 'permission',
         permission: threadPermissions.ADD_MEMBERS,
       });
     }
     const hasNecessaryPermissions = await checkThread(
       viewer,
       request.threadID,
       checks,
     );
     if (!hasNecessaryPermissions) {
       throw new ServerError('invalid_credentials');
     }
   })();
 
   const { serverThreadInfos } = await promiseAll(validationPromises);
 
   const serverThreadInfo = serverThreadInfos.threadInfos[request.threadID];
   if (!serverThreadInfo) {
     throw new ServerError('internal_error');
   }
 
   // Threads with source message should be visible to everyone, but we can't
   // guarantee it for COMMUNITY_SECRET_SUBTHREAD threads so we forbid it for
   // now. In the future, if we want to support this, we would need to unlink the
   // source message.
   if (
     threadType !== null &&
     threadType !== undefined &&
     threadType !== threadTypes.SIDEBAR &&
     threadType !== threadTypes.COMMUNITY_OPEN_SUBTHREAD &&
     serverThreadInfo.sourceMessageID
   ) {
     throw new ServerError('invalid_parameters');
   }
 
   // You can't change the parent thread of a current or former SIDEBAR
   if (parentThreadID !== undefined && serverThreadInfo.sourceMessageID) {
     throw new ServerError('invalid_parameters');
   }
 
   const oldThreadType = serverThreadInfo.type;
   const oldParentThreadID = serverThreadInfo.parentThreadID;
   const oldContainingThreadID = serverThreadInfo.containingThreadID;
   const oldCommunity = serverThreadInfo.community;
   const oldDepth = serverThreadInfo.depth;
 
   const nextThreadType =
     threadType !== null && threadType !== undefined
       ? threadType
       : oldThreadType;
   let nextParentThreadID =
     parentThreadID !== undefined ? parentThreadID : oldParentThreadID;
 
   // Does the new thread type preclude a parent?
   if (
     threadType !== undefined &&
     threadType !== null &&
     getThreadTypeParentRequirement(threadType) === 'disabled' &&
     nextParentThreadID !== null
   ) {
     nextParentThreadID = null;
     sqlUpdate.parent_thread_id = null;
   }
 
   // Does the new thread type require a parent?
   if (
     threadType !== undefined &&
     threadType !== null &&
     getThreadTypeParentRequirement(threadType) === 'required' &&
     nextParentThreadID === null
   ) {
     throw new ServerError('no_parent_thread_specified');
   }
 
   const determineThreadAncestryPromise = determineThreadAncestry(
     nextParentThreadID,
     nextThreadType,
   );
 
   const confirmParentPermissionPromise = (async () => {
     if (ignorePermissions || !nextParentThreadID) {
       return;
     }
     if (
       nextParentThreadID === oldParentThreadID &&
       (nextThreadType === threadTypes.SIDEBAR) ===
         (oldThreadType === threadTypes.SIDEBAR)
     ) {
       return;
     }
     const hasParentPermission = await checkThreadPermission(
       viewer,
       nextParentThreadID,
       nextThreadType === threadTypes.SIDEBAR
         ? threadPermissions.CREATE_SIDEBARS
         : threadPermissions.CREATE_SUBCHANNELS,
     );
     if (!hasParentPermission) {
       throw new ServerError('invalid_parameters');
     }
   })();
 
   const rolesNeedUpdate = forceUpdateRoot || nextThreadType !== oldThreadType;
 
   const validateNewMembersPromise = (async () => {
     if (!newMemberIDs || ignorePermissions) {
       return;
     }
 
     const defaultRolePermissionsPromise = (async () => {
       let rolePermissions;
       if (!rolesNeedUpdate) {
         const rolePermissionsQuery = SQL`
           SELECT r.permissions
           FROM threads t
           LEFT JOIN roles r ON r.id = t.default_role
           WHERE t.id = ${request.threadID}
         `;
         const [result] = await dbQuery(rolePermissionsQuery);
         if (result.length > 0) {
           rolePermissions = JSON.parse(result[0].permissions);
         }
       }
       if (!rolePermissions) {
         rolePermissions = getRolePermissionBlobs(nextThreadType).Members;
       }
       return rolePermissions;
     })();
 
     const [defaultRolePermissions, nextThreadAncestry] = await Promise.all([
       defaultRolePermissionsPromise,
       determineThreadAncestryPromise,
     ]);
 
     const { newMemberIDs: validatedIDs } = await validateCandidateMembers(
       viewer,
       { newMemberIDs },
       {
         threadType: nextThreadType,
         parentThreadID: nextParentThreadID,
         containingThreadID: nextThreadAncestry.containingThreadID,
         defaultRolePermissions,
       },
       { requireRelationship: !forceAddMembers },
     );
     if (
       validatedIDs &&
       Number(validatedIDs?.length) < Number(newMemberIDs?.length)
     ) {
       throw new ServerError('invalid_credentials');
     }
   })();
 
   const { nextThreadAncestry } = await promiseAll({
     nextThreadAncestry: determineThreadAncestryPromise,
     confirmParentPermissionPromise,
     validateNewMembersPromise,
   });
   if (nextThreadAncestry.containingThreadID !== oldContainingThreadID) {
     sqlUpdate.containing_thread_id = nextThreadAncestry.containingThreadID;
   }
   if (nextThreadAncestry.community !== oldCommunity) {
     if (!ignorePermissions) {
       throw new ServerError('invalid_parameters');
     }
     sqlUpdate.community = nextThreadAncestry.community;
   }
   if (nextThreadAncestry.depth !== oldDepth) {
     sqlUpdate.depth = nextThreadAncestry.depth;
   }
 
   const updateQueryPromise = (async () => {
     if (Object.keys(sqlUpdate).length === 0) {
       return;
     }
 
     const { avatar: avatarUpdate, ...nonAvatarUpdates } = sqlUpdate;
     const updatePromises = [];
 
     if (Object.keys(nonAvatarUpdates).length > 0) {
       const nonAvatarUpdateQuery = SQL`
         UPDATE threads
         SET ${nonAvatarUpdates}
         WHERE id = ${request.threadID}
       `;
       updatePromises.push(dbQuery(nonAvatarUpdateQuery));
     }
 
     if (avatarUpdate !== undefined) {
       const avatarUploadID =
         avatar && avatar.type === 'image' ? avatar.uploadID : null;
 
       const avatarUpdateQuery = SQL`
         START TRANSACTION;
 
         UPDATE uploads
         SET container = NULL
         WHERE container = ${request.threadID}
           AND (
             ${avatarUploadID} IS NULL
             OR EXISTS (
               SELECT 1
               FROM uploads
               WHERE id = ${avatarUploadID}
                 AND ${avatarUploadID} IS NOT NULL
                 AND uploader = ${viewer.userID}
                 AND container IS NULL
                 AND thread IS NULL
              )
           );
 
         UPDATE uploads
         SET container = ${request.threadID}
         WHERE id = ${avatarUploadID}
           AND ${avatarUploadID} IS NOT NULL
           AND uploader = ${viewer.userID}
           AND container IS NULL
           AND thread IS NULL;
 
         UPDATE threads
         SET avatar = ${avatarUpdate}
         WHERE id = ${request.threadID}
           AND (
             ${avatarUploadID} IS NULL
             OR EXISTS (
               SELECT 1
               FROM uploads
               WHERE id = ${avatarUploadID}
                 AND ${avatarUploadID} IS NOT NULL
                 AND uploader = ${viewer.userID}
                 AND container = ${request.threadID}
                 AND thread IS NULL
             )
           );
 
         COMMIT;
       `;
 
       updatePromises.push(
         dbQuery(avatarUpdateQuery, { multipleStatements: true }),
       );
     }
 
     await Promise.all(updatePromises);
   })();
 
   const updateRolesPromise = (async () => {
     if (rolesNeedUpdate) {
       await updateRoles(viewer, request.threadID, nextThreadType);
     }
   })();
 
   const intermediatePromises = {};
   intermediatePromises.updateQuery = updateQueryPromise;
   intermediatePromises.updateRoles = updateRolesPromise;
 
   if (newMemberIDs) {
     intermediatePromises.addMembersChangeset = (async () => {
       await Promise.all([updateQueryPromise, updateRolesPromise]);
       return await changeRole(request.threadID, newMemberIDs, null, {
         setNewMembersToUnread: true,
       });
     })();
   }
 
   const threadRootChanged =
     rolesNeedUpdate || nextParentThreadID !== oldParentThreadID;
   if (threadRootChanged) {
     intermediatePromises.recalculatePermissionsChangeset = (async () => {
       await Promise.all([updateQueryPromise, updateRolesPromise]);
       return await recalculateThreadPermissions(request.threadID);
     })();
   }
 
   const { addMembersChangeset, recalculatePermissionsChangeset } =
     await promiseAll(intermediatePromises);
 
   const membershipRows = [];
   const relationshipChangeset = new RelationshipChangeset();
   if (recalculatePermissionsChangeset) {
     const {
       membershipRows: recalculateMembershipRows,
       relationshipChangeset: recalculateRelationshipChangeset,
     } = recalculatePermissionsChangeset;
     membershipRows.push(...recalculateMembershipRows);
     relationshipChangeset.addAll(recalculateRelationshipChangeset);
   }
   let addedMemberIDs;
   if (addMembersChangeset) {
     const {
       membershipRows: addMembersMembershipRows,
       relationshipChangeset: addMembersRelationshipChangeset,
     } = addMembersChangeset;
     addedMemberIDs = addMembersMembershipRows
       .filter(
         row =>
           row.operation === 'save' &&
           row.threadID === request.threadID &&
           Number(row.role) > 0,
       )
       .map(row => row.userID);
     membershipRows.push(...addMembersMembershipRows);
     relationshipChangeset.addAll(addMembersRelationshipChangeset);
   }
 
   const changeset = { membershipRows, relationshipChangeset };
   const { viewerUpdates } = await commitMembershipChangeset(viewer, changeset, {
     // This forces an update for this thread,
     // regardless of whether any membership rows are changed
     changedThreadIDs:
       Object.keys(sqlUpdate).length > 0
         ? new Set([request.threadID])
         : new Set(),
     // last_message will be updated automatically if we send a message,
     // so we only need to handle it here when we silence new messages
     updateMembershipsLastMessage: silenceMessages,
   });
 
   let newMessageInfos = [];
   if (!silenceMessages) {
     const time = Date.now();
     const messageDatas = [];
     for (const fieldName in changedFields) {
       const newValue = changedFields[fieldName];
       messageDatas.push({
         type: messageTypes.CHANGE_SETTINGS,
         threadID: request.threadID,
         creatorID: viewer.userID,
         time,
         field: fieldName,
         value: newValue,
       });
     }
     if (addedMemberIDs && addedMemberIDs.length > 0) {
       messageDatas.push({
         type: messageTypes.ADD_MEMBERS,
         threadID: request.threadID,
         creatorID: viewer.userID,
         time,
         addedUserIDs: addedMemberIDs,
       });
     }
     newMessageInfos = await createMessages(viewer, messageDatas);
   }
 
   return { updatesResult: { newUpdates: viewerUpdates }, newMessageInfos };
 }
 
 async function joinThread(
   viewer: Viewer,
   request: ServerThreadJoinRequest,
 ): Promise<ThreadJoinResult> {
   if (!viewer.loggedIn) {
     throw new ServerError('not_logged_in');
   }
 
   const permissionCheck = request.inviteLinkSecret
     ? checkIfInviteLinkIsValid(request.inviteLinkSecret, request.threadID)
     : checkThreadPermission(
         viewer,
         request.threadID,
         threadPermissions.JOIN_THREAD,
       );
   const [isMember, hasPermission] = await Promise.all([
     fetchViewerIsMember(viewer, request.threadID),
     permissionCheck,
   ]);
   if (!hasPermission) {
     throw new ServerError('invalid_parameters');
   }
 
   const { calendarQuery } = request;
   if (isMember) {
     const response: ThreadJoinResult = {
       rawMessageInfos: [],
       truncationStatuses: {},
       userInfos: {},
       updatesResult: {
         newUpdates: [],
       },
     };
     return response;
   }
 
   if (calendarQuery) {
     const threadFilterIDs = filteredThreadIDs(calendarQuery.filters);
     if (
       !threadFilterIDs ||
       threadFilterIDs.size !== 1 ||
       threadFilterIDs.values().next().value !== request.threadID
     ) {
       throw new ServerError('invalid_parameters');
     }
   }
 
   const changeset = await changeRole(request.threadID, [viewer.userID], null);
 
   const membershipResult = await commitMembershipChangeset(viewer, changeset, {
     calendarQuery,
   });
 
   if (request.inviteLinkSecret) {
     handleAsyncPromise(reportLinkUsage(request.inviteLinkSecret));
   }
 
   const messageData = {
     type: messageTypes.JOIN_THREAD,
     threadID: request.threadID,
     creatorID: viewer.userID,
     time: Date.now(),
   };
   const newMessages = await createMessages(viewer, [messageData]);
 
   return {
     rawMessageInfos: newMessages,
     truncationStatuses: {},
     userInfos: membershipResult.userInfos,
     updatesResult: {
       newUpdates: membershipResult.viewerUpdates,
     },
   };
 }
 
 async function toggleMessagePinForThread(
   viewer: Viewer,
   request: ToggleMessagePinRequest,
 ): Promise<ToggleMessagePinResult> {
   const { messageID, action } = request;
 
   const targetMessage = await fetchMessageInfoByID(viewer, messageID);
-  if (!targetMessage || isInvalidPinSource(targetMessage)) {
+  if (!targetMessage) {
     throw new ServerError('invalid_parameters');
   }
 
   const { threadID } = targetMessage;
-  const hasPermission = await checkThreadPermission(
-    viewer,
+  const fetchServerThreadInfosResult = await fetchServerThreadInfos({
     threadID,
-    threadPermissions.MANAGE_PINS,
+  });
+  const { threadInfos: rawThreadInfos } = rawThreadInfosFromServerThreadInfos(
+    viewer,
+    fetchServerThreadInfosResult,
   );
-  if (!hasPermission) {
-    throw new ServerError('invalid_credentials');
+  const rawThreadInfo = rawThreadInfos[threadID];
+
+  const canTogglePin = canToggleMessagePin(targetMessage, rawThreadInfo);
+  if (!canTogglePin) {
+    throw new ServerError('invalid_parameters');
   }
 
   const pinnedValue = action === 'pin' ? 1 : 0;
   const pinTimeValue = action === 'pin' ? Date.now() : null;
   const pinnedCountValue = action === 'pin' ? 1 : -1;
 
   const query = SQL`
     UPDATE messages AS m, threads AS t
     SET m.pinned = ${pinnedValue},
       m.pin_time = ${pinTimeValue},
       t.pinned_count = t.pinned_count + ${pinnedCountValue}
     WHERE m.id = ${messageID}
       AND m.thread = ${threadID}
       AND t.id = ${threadID}
       AND m.pinned != ${pinnedValue}
   `;
 
   const [result] = await dbQuery(query);
 
   if (result.affectedRows === 0) {
     return {
       newMessageInfos: [],
       threadID,
     };
   }
 
   const createMessagesAsync = async () => {
     const messageData = {
       type: messageTypes.TOGGLE_PIN,
       threadID,
       targetMessageID: messageID,
       action,
       pinnedContent: getPinnedContentFromMessage(targetMessage),
       creatorID: viewer.userID,
       time: Date.now(),
     };
     const newMessageInfos = await createMessages(viewer, [messageData]);
     return newMessageInfos;
   };
 
   const createUpdatesAsync = async () => {
-    const { threadInfos: serverThreadInfos } = await fetchServerThreadInfos({
-      threadID,
-    });
+    const { threadInfos: serverThreadInfos } = fetchServerThreadInfosResult;
     const time = Date.now();
     const updates = [];
     for (const member of serverThreadInfos[threadID].members) {
       updates.push({
         userID: member.id,
         time,
         threadID,
         type: updateTypes.UPDATE_THREAD,
       });
     }
     await createUpdates(updates);
   };
 
   const [newMessageInfos] = await Promise.all([
     createMessagesAsync(),
     createUpdatesAsync(),
   ]);
 
   return {
     newMessageInfos,
     threadID,
   };
 }
 
 export {
   updateRole,
   removeMembers,
   leaveThread,
   updateThread,
   joinThread,
   toggleMessagePinForThread,
 };
diff --git a/lib/shared/message-utils.js b/lib/shared/message-utils.js
index c579440a8..2dcdcec4a 100644
--- a/lib/shared/message-utils.js
+++ b/lib/shared/message-utils.js
@@ -1,727 +1,727 @@
 // @flow
 
 import invariant from 'invariant';
 import _maxBy from 'lodash/fp/maxBy.js';
 import _orderBy from 'lodash/fp/orderBy.js';
 import * as React from 'react';
 
 import { codeBlockRegex, type ParserRules } from './markdown.js';
 import type { CreationSideEffectsFunc } from './messages/message-spec.js';
 import { messageSpecs } from './messages/message-specs.js';
 import { threadIsGroupChat } from './thread-utils.js';
 import { useStringForUser } from '../hooks/ens-cache.js';
 import { contentStringForMediaArray } from '../media/media-utils.js';
 import type { ChatMessageInfoItem } from '../selectors/chat-selectors.js';
 import { threadInfoSelector } from '../selectors/thread-selectors.js';
 import { userIDsToRelativeUserInfos } from '../selectors/user-selectors.js';
 import { type PlatformDetails, isWebPlatform } from '../types/device-types.js';
 import type { Media } from '../types/media-types.js';
 import { messageTypes } from '../types/message-types-enum.js';
 import {
   type MessageInfo,
   type RawMessageInfo,
   type RobotextMessageInfo,
   type RawMultimediaMessageInfo,
   type MessageData,
   type MessageTruncationStatus,
   type MultimediaMessageData,
   type MessageStore,
   type ComposableMessageInfo,
   messageTruncationStatus,
   type RawComposableMessageInfo,
   type ThreadMessageInfo,
 } from '../types/message-types.js';
 import type {
   EditMessageInfo,
   RawEditMessageInfo,
 } from '../types/messages/edit.js';
 import type { ImagesMessageData } from '../types/messages/images.js';
 import type { MediaMessageData } from '../types/messages/media.js';
 import type {
   RawReactionMessageInfo,
   ReactionMessageInfo,
 } from '../types/messages/reaction.js';
-import type { ThreadInfo } from '../types/thread-types.js';
+import type { RawThreadInfo, ThreadInfo } from '../types/thread-types.js';
 import type { UserInfos } from '../types/user-types.js';
 import {
   type EntityText,
   ET,
   useEntityTextAsString,
 } from '../utils/entity-text.js';
 import { useSelector } from '../utils/redux-utils.js';
 
 const localIDPrefix = 'local';
 
 const defaultMediaMessageOptions = Object.freeze({});
 
 // Prefers localID
 function messageKey(messageInfo: MessageInfo | RawMessageInfo): string {
   if (messageInfo.localID) {
     return messageInfo.localID;
   }
   invariant(messageInfo.id, 'localID should exist if ID does not');
   return messageInfo.id;
 }
 
 // Prefers serverID
 function messageID(messageInfo: MessageInfo | RawMessageInfo): string {
   if (messageInfo.id) {
     return messageInfo.id;
   }
   invariant(messageInfo.localID, 'localID should exist if ID does not');
   return messageInfo.localID;
 }
 
 function robotextForMessageInfo(
   messageInfo: RobotextMessageInfo,
   threadInfo: ?ThreadInfo,
   parentThreadInfo: ?ThreadInfo,
 ): EntityText {
   const messageSpec = messageSpecs[messageInfo.type];
   invariant(
     messageSpec.robotext,
     `we're not aware of messageType ${messageInfo.type}`,
   );
   return messageSpec.robotext(messageInfo, { threadInfo, parentThreadInfo });
 }
 
 function createMessageInfo(
   rawMessageInfo: RawMessageInfo,
   viewerID: ?string,
   userInfos: UserInfos,
   threadInfos: { +[id: string]: ThreadInfo },
 ): ?MessageInfo {
   const creatorInfo = userInfos[rawMessageInfo.creatorID];
   const creator = {
     id: rawMessageInfo.creatorID,
     username: creatorInfo ? creatorInfo.username : 'anonymous',
     isViewer: rawMessageInfo.creatorID === viewerID,
   };
 
   const createRelativeUserInfos = (userIDs: $ReadOnlyArray<string>) =>
     userIDsToRelativeUserInfos(userIDs, viewerID, userInfos);
   const createMessageInfoFromRaw = (rawInfo: RawMessageInfo) =>
     createMessageInfo(rawInfo, viewerID, userInfos, threadInfos);
 
   const messageSpec = messageSpecs[rawMessageInfo.type];
 
   return messageSpec.createMessageInfo(rawMessageInfo, creator, {
     threadInfos,
     createMessageInfoFromRaw,
     createRelativeUserInfos,
   });
 }
 
 type LengthResult = {
   +local: number,
   +realized: number,
 };
 function findMessageIDMaxLengths(
   messageIDs: $ReadOnlyArray<?string>,
 ): LengthResult {
   const result = {
     local: 0,
     realized: 0,
   };
   for (const id of messageIDs) {
     if (!id) {
       continue;
     }
     if (id.startsWith(localIDPrefix)) {
       result.local = Math.max(result.local, id.length - localIDPrefix.length);
     } else {
       result.realized = Math.max(result.realized, id.length);
     }
   }
   return result;
 }
 
 function extendMessageID(id: ?string, lengths: LengthResult): ?string {
   if (!id) {
     return id;
   }
   if (id.startsWith(localIDPrefix)) {
     const zeroPaddedID = id
       .substr(localIDPrefix.length)
       .padStart(lengths.local, '0');
     return `${localIDPrefix}${zeroPaddedID}`;
   }
   return id.padStart(lengths.realized, '0');
 }
 
 function sortMessageInfoList<T: MessageInfo | RawMessageInfo>(
   messageInfos: $ReadOnlyArray<T>,
 ): T[] {
   const lengths = findMessageIDMaxLengths(
     messageInfos.map(message => message?.id),
   );
   return _orderBy([
     'time',
     (message: T) => extendMessageID(message?.id, lengths),
   ])(['desc', 'desc'])(messageInfos);
 }
 
 const sortMessageIDs: (messages: { +[id: string]: RawMessageInfo }) => (
   messageIDs: $ReadOnlyArray<string>,
 ) => string[] = messages => messageIDs => {
   const lengths = findMessageIDMaxLengths(messageIDs);
   return _orderBy([
     (id: string) => messages[id].time,
     (id: string) => extendMessageID(id, lengths),
   ])(['desc', 'desc'])(messageIDs);
 };
 
 function rawMessageInfoFromMessageData(
   messageData: MessageData,
   id: ?string,
 ): RawMessageInfo {
   const messageSpec = messageSpecs[messageData.type];
   invariant(
     messageSpec.rawMessageInfoFromMessageData,
     `we're not aware of messageType ${messageData.type}`,
   );
   return messageSpec.rawMessageInfoFromMessageData(messageData, id);
 }
 
 function mostRecentMessageTimestamp(
   messageInfos: $ReadOnlyArray<RawMessageInfo>,
   previousTimestamp: number,
 ): number {
   if (messageInfos.length === 0) {
     return previousTimestamp;
   }
   return _maxBy('time')(messageInfos).time;
 }
 
 function usersInMessageInfos(
   messageInfos: $ReadOnlyArray<MessageInfo | RawMessageInfo>,
 ): string[] {
   const userIDs = new Set();
   for (const messageInfo of messageInfos) {
     if (messageInfo.creatorID) {
       userIDs.add(messageInfo.creatorID);
     } else if (messageInfo.creator) {
       userIDs.add(messageInfo.creator.id);
     }
   }
   return [...userIDs];
 }
 
 function combineTruncationStatuses(
   first: MessageTruncationStatus,
   second: ?MessageTruncationStatus,
 ): MessageTruncationStatus {
   if (
     first === messageTruncationStatus.EXHAUSTIVE ||
     second === messageTruncationStatus.EXHAUSTIVE
   ) {
     return messageTruncationStatus.EXHAUSTIVE;
   } else if (
     first === messageTruncationStatus.UNCHANGED &&
     second !== null &&
     second !== undefined
   ) {
     return second;
   } else {
     return first;
   }
 }
 
 function shimUnsupportedRawMessageInfos(
   rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   platformDetails: ?PlatformDetails,
 ): RawMessageInfo[] {
   if (platformDetails && isWebPlatform(platformDetails.platform)) {
     return [...rawMessageInfos];
   }
   return rawMessageInfos.map(rawMessageInfo => {
     const { shimUnsupportedMessageInfo } = messageSpecs[rawMessageInfo.type];
     if (shimUnsupportedMessageInfo) {
       return shimUnsupportedMessageInfo(rawMessageInfo, platformDetails);
     }
     return rawMessageInfo;
   });
 }
 
 type MediaMessageDataCreationInput = {
   +threadID: string,
   +creatorID: string,
   +media: $ReadOnlyArray<Media>,
   +localID?: ?string,
   +time?: ?number,
   +sidebarCreation?: ?boolean,
   ...
 };
 function createMediaMessageData(
   input: MediaMessageDataCreationInput,
   options: {
     +forceMultimediaMessageType?: boolean,
   } = defaultMediaMessageOptions,
 ): MultimediaMessageData {
   let allMediaArePhotos = true;
   const photoMedia = [];
   for (const singleMedia of input.media) {
     if (singleMedia.type !== 'photo') {
       allMediaArePhotos = false;
       break;
     } else {
       photoMedia.push(singleMedia);
     }
   }
 
   const { localID, threadID, creatorID, sidebarCreation } = input;
   const { forceMultimediaMessageType = false } = options;
   const time = input.time ? input.time : Date.now();
   let messageData;
   if (allMediaArePhotos && !forceMultimediaMessageType) {
     messageData = ({
       type: messageTypes.IMAGES,
       threadID,
       creatorID,
       time,
       media: photoMedia,
     }: ImagesMessageData);
     if (localID) {
       messageData = { ...messageData, localID };
     }
     if (sidebarCreation) {
       messageData = { ...messageData, sidebarCreation };
     }
   } else {
     messageData = ({
       type: messageTypes.MULTIMEDIA,
       threadID,
       creatorID,
       time,
       media: input.media,
     }: MediaMessageData);
     if (localID) {
       messageData = { ...messageData, localID };
     }
     if (sidebarCreation) {
       messageData = { ...messageData, sidebarCreation };
     }
   }
   return messageData;
 }
 
 type MediaMessageInfoCreationInput = {
   ...$Exact<MediaMessageDataCreationInput>,
   +id?: ?string,
 };
 function createMediaMessageInfo(
   input: MediaMessageInfoCreationInput,
   options: {
     +forceMultimediaMessageType?: boolean,
   } = defaultMediaMessageOptions,
 ): RawMultimediaMessageInfo {
   const messageData = createMediaMessageData(input, options);
   const createRawMessageInfo =
     messageSpecs[messageData.type].rawMessageInfoFromMessageData;
   invariant(
     createRawMessageInfo,
     'multimedia message spec should have rawMessageInfoFromMessageData',
   );
   const result = createRawMessageInfo(messageData, input.id);
   invariant(
     result.type === messageTypes.MULTIMEDIA ||
       result.type === messageTypes.IMAGES,
     `media messageSpec returned MessageType ${result.type}`,
   );
   return result;
 }
 
 function stripLocalID(
   rawMessageInfo:
     | RawComposableMessageInfo
     | RawReactionMessageInfo
     | RawEditMessageInfo,
 ) {
   const { localID, ...rest } = rawMessageInfo;
   return rest;
 }
 
 function stripLocalIDs(
   input: $ReadOnlyArray<RawMessageInfo>,
 ): RawMessageInfo[] {
   const output = [];
   for (const rawMessageInfo of input) {
     if (rawMessageInfo.localID) {
       invariant(
         rawMessageInfo.id,
         'serverID should be set if localID is being stripped',
       );
       output.push(stripLocalID(rawMessageInfo));
     } else {
       output.push(rawMessageInfo);
     }
   }
   return output;
 }
 
 // Normally we call trim() to remove whitespace at the beginning and end of each
 // message. However, our Markdown parser supports a "codeBlock" format where the
 // user can indent each line to indicate a code block. If we match the
 // corresponding RegEx, we'll only trim whitespace off the end.
 function trimMessage(message: string): string {
   message = message.replace(/^\n*/, '');
   return codeBlockRegex.exec(message) ? message.trimEnd() : message.trim();
 }
 
 function createMessageQuote(message: string): string {
   // add `>` to each line to include empty lines in the quote
   return message.replace(/^/gm, '> ');
 }
 
 function createMessageReply(message: string): string {
   return createMessageQuote(message) + '\n\n';
 }
 
 function getMostRecentNonLocalMessageID(
   threadID: string,
   messageStore: MessageStore,
 ): ?string {
   const thread = messageStore.threads[threadID];
   return thread?.messageIDs.find(id => !id.startsWith(localIDPrefix));
 }
 
 function getOldestNonLocalMessageID(
   threadID: string,
   messageStore: MessageStore,
 ): ?string {
   const thread = messageStore.threads[threadID];
   if (!thread) {
     return thread;
   }
   const { messageIDs } = thread;
   for (let i = messageIDs.length - 1; i >= 0; i--) {
     const id = messageIDs[i];
     if (!id.startsWith(localIDPrefix)) {
       return id;
     }
   }
   return undefined;
 }
 
 function getMessageTitle(
   messageInfo:
     | ComposableMessageInfo
     | RobotextMessageInfo
     | ReactionMessageInfo
     | EditMessageInfo,
   threadInfo: ThreadInfo,
   parentThreadInfo: ?ThreadInfo,
   markdownRules: ParserRules,
 ): EntityText {
   const { messageTitle } = messageSpecs[messageInfo.type];
   if (messageTitle) {
     return messageTitle({ messageInfo, threadInfo, markdownRules });
   }
 
   invariant(
     messageInfo.type !== messageTypes.TEXT &&
       messageInfo.type !== messageTypes.IMAGES &&
       messageInfo.type !== messageTypes.MULTIMEDIA &&
       messageInfo.type !== messageTypes.REACTION &&
       messageInfo.type !== messageTypes.EDIT_MESSAGE,
     'messageTitle can only be auto-generated for RobotextMessageInfo',
   );
   return robotextForMessageInfo(messageInfo, threadInfo, parentThreadInfo);
 }
 
 function mergeThreadMessageInfos(
   first: ThreadMessageInfo,
   second: ThreadMessageInfo,
   messages: { +[id: string]: RawMessageInfo },
 ): ThreadMessageInfo {
   let firstPointer = 0;
   let secondPointer = 0;
   const mergedMessageIDs = [];
   let firstCandidate = first.messageIDs[firstPointer];
   let secondCandidate = second.messageIDs[secondPointer];
   while (firstCandidate !== undefined || secondCandidate !== undefined) {
     if (firstCandidate === undefined) {
       mergedMessageIDs.push(secondCandidate);
       secondPointer++;
     } else if (secondCandidate === undefined) {
       mergedMessageIDs.push(firstCandidate);
       firstPointer++;
     } else if (firstCandidate === secondCandidate) {
       mergedMessageIDs.push(firstCandidate);
       firstPointer++;
       secondPointer++;
     } else {
       const firstMessage = messages[firstCandidate];
       const secondMessage = messages[secondCandidate];
       invariant(
         firstMessage && secondMessage,
         'message in messageIDs not present in MessageStore',
       );
       if (
         (firstMessage.id &&
           secondMessage.id &&
           firstMessage.id === secondMessage.id) ||
         (firstMessage.localID &&
           secondMessage.localID &&
           firstMessage.localID === secondMessage.localID)
       ) {
         mergedMessageIDs.push(firstCandidate);
         firstPointer++;
         secondPointer++;
       } else if (firstMessage.time < secondMessage.time) {
         mergedMessageIDs.push(secondCandidate);
         secondPointer++;
       } else {
         mergedMessageIDs.push(firstCandidate);
         firstPointer++;
       }
     }
     firstCandidate = first.messageIDs[firstPointer];
     secondCandidate = second.messageIDs[secondPointer];
   }
   return {
     messageIDs: mergedMessageIDs,
     startReached: first.startReached && second.startReached,
   };
 }
 
 type MessagePreviewPart = {
   +text: string,
   // unread has highest contrast, followed by primary, followed by secondary
   +style: 'unread' | 'primary' | 'secondary',
 };
 export type MessagePreviewResult = {
   +message: MessagePreviewPart,
   +username: ?MessagePreviewPart,
 };
 function useMessagePreview(
   originalMessageInfo: ?MessageInfo,
   threadInfo: ThreadInfo,
   markdownRules: ParserRules,
 ): ?MessagePreviewResult {
   let messageInfo;
   if (
     originalMessageInfo &&
     originalMessageInfo.type === messageTypes.SIDEBAR_SOURCE
   ) {
     messageInfo = originalMessageInfo.sourceMessage;
   } else {
     messageInfo = originalMessageInfo;
   }
 
   const { parentThreadID } = threadInfo;
   const parentThreadInfo = useSelector(state =>
     parentThreadID ? threadInfoSelector(state)[parentThreadID] : null,
   );
 
   const hasUsername =
     threadIsGroupChat(threadInfo) ||
     threadInfo.name !== '' ||
     messageInfo?.creator.isViewer;
   const shouldDisplayUser =
     messageInfo?.type === messageTypes.TEXT && hasUsername;
 
   const stringForUser = useStringForUser(
     shouldDisplayUser ? messageInfo?.creator : null,
   );
 
   const { unread } = threadInfo.currentUser;
   const username = React.useMemo(() => {
     if (!shouldDisplayUser) {
       return null;
     }
     invariant(
       stringForUser,
       'useStringForUser should only return falsey if pass null or undefined',
     );
     return {
       text: stringForUser,
       style: unread ? 'unread' : 'secondary',
     };
   }, [shouldDisplayUser, stringForUser, unread]);
 
   const messageTitleEntityText = React.useMemo(() => {
     if (!messageInfo) {
       return messageInfo;
     }
     return getMessageTitle(
       messageInfo,
       threadInfo,
       parentThreadInfo,
       markdownRules,
     );
   }, [messageInfo, threadInfo, parentThreadInfo, markdownRules]);
 
   const threadID = threadInfo.id;
   const entityTextToStringParams = React.useMemo(
     () => ({
       threadID,
     }),
     [threadID],
   );
   const messageTitle = useEntityTextAsString(
     messageTitleEntityText,
     entityTextToStringParams,
   );
 
   const isTextMessage = messageInfo?.type === messageTypes.TEXT;
   const message = React.useMemo(() => {
     if (messageTitle === null || messageTitle === undefined) {
       return messageTitle;
     }
 
     let style;
     if (unread) {
       style = 'unread';
     } else if (isTextMessage) {
       style = 'primary';
     } else {
       style = 'secondary';
     }
 
     return { text: messageTitle, style };
   }, [messageTitle, unread, isTextMessage]);
 
   return React.useMemo(() => {
     if (!message) {
       return message;
     }
     return { message, username };
   }, [message, username]);
 }
 
 function useMessageCreationSideEffectsFunc<Info: RawMessageInfo>(
   messageType: $PropertyType<Info, 'type'>,
 ): CreationSideEffectsFunc<Info> {
   const messageSpec = messageSpecs[messageType];
   invariant(messageSpec, `we're not aware of messageType ${messageType}`);
   invariant(
     messageSpec.useCreationSideEffectsFunc,
     `no useCreationSideEffectsFunc in message spec for ${messageType}`,
   );
   return messageSpec.useCreationSideEffectsFunc();
 }
 
 function getPinnedContentFromMessage(targetMessage: RawMessageInfo): string {
   let pinnedContent;
   if (
     targetMessage.type === messageTypes.IMAGES ||
     targetMessage.type === messageTypes.MULTIMEDIA
   ) {
     pinnedContent = contentStringForMediaArray(targetMessage.media);
   } else {
     pinnedContent = 'a message';
   }
 
   return pinnedContent;
 }
 
 function modifyItemForResultScreen(
   item: ChatMessageInfoItem,
 ): ChatMessageInfoItem {
   if (item.messageInfoType === 'composable') {
     return {
       ...item,
       startsConversation: false,
       startsCluster: true,
       endsCluster: true,
       messageInfo: {
         ...item.messageInfo,
         creator: {
           ...item.messageInfo.creator,
           isViewer: false,
         },
       },
     };
   }
   return item;
 }
 
 function constructChangeRoleEntityText(
   affectedUsers: EntityText | string,
   roleName: ?string,
 ): EntityText {
   if (!roleName) {
     return ET`assigned ${affectedUsers} a new role`;
   }
 
   return ET`assigned ${affectedUsers} the "${roleName}" role`;
 }
 
 function useNextLocalID(): string {
   const nextLocalID = useSelector(state => state.nextLocalID);
   return `${localIDPrefix}${nextLocalID}`;
 }
 
 function isInvalidSidebarSource(
   message: RawMessageInfo | MessageInfo,
 ): boolean %checks {
   return (
     (message.type === messageTypes.REACTION ||
       message.type === messageTypes.EDIT_MESSAGE ||
       message.type === messageTypes.SIDEBAR_SOURCE ||
       message.type === messageTypes.TOGGLE_PIN) &&
     !messageSpecs[message.type].canBeSidebarSource
   );
 }
 
 // Prefer checking isInvalidPinSourceForThread below. This function doesn't
 // check whether the user is attempting to pin a SIDEBAR_SOURCE in the context
 // of its parent thread, so it's not suitable for permission checks. We only
 // use it in the message-fetchers.js code where we don't have access to the
 // RawThreadInfo and don't need to do permission checks.
 function isInvalidPinSource(
   messageInfo: RawMessageInfo | MessageInfo,
 ): boolean {
   return !messageSpecs[messageInfo.type].canBePinned;
 }
 
 function isInvalidPinSourceForThread(
   messageInfo: RawMessageInfo | MessageInfo,
-  threadInfo: ThreadInfo,
+  threadInfo: RawThreadInfo | ThreadInfo,
 ): boolean {
   const isValidPinSource = !isInvalidPinSource(messageInfo);
   const isFirstMessageInSidebar = threadInfo.sourceMessageID === messageInfo.id;
   return !isValidPinSource || isFirstMessageInSidebar;
 }
 
 function isUnableToBeRenderedIndependently(
   message: RawMessageInfo | MessageInfo,
 ): boolean {
   return !messageSpecs[message.type].canBeRenderedIndependently;
 }
 
 export {
   localIDPrefix,
   messageKey,
   messageID,
   robotextForMessageInfo,
   createMessageInfo,
   sortMessageInfoList,
   sortMessageIDs,
   rawMessageInfoFromMessageData,
   mostRecentMessageTimestamp,
   usersInMessageInfos,
   combineTruncationStatuses,
   shimUnsupportedRawMessageInfos,
   createMediaMessageData,
   createMediaMessageInfo,
   stripLocalIDs,
   trimMessage,
   createMessageQuote,
   createMessageReply,
   getMostRecentNonLocalMessageID,
   getOldestNonLocalMessageID,
   getMessageTitle,
   mergeThreadMessageInfos,
   useMessagePreview,
   useMessageCreationSideEffectsFunc,
   getPinnedContentFromMessage,
   modifyItemForResultScreen,
   constructChangeRoleEntityText,
   useNextLocalID,
   isInvalidSidebarSource,
   isInvalidPinSource,
   isInvalidPinSourceForThread,
   isUnableToBeRenderedIndependently,
 };
diff --git a/lib/utils/toggle-pin-utils.js b/lib/utils/toggle-pin-utils.js
index 59ba2ca8d..417105788 100644
--- a/lib/utils/toggle-pin-utils.js
+++ b/lib/utils/toggle-pin-utils.js
@@ -1,25 +1,22 @@
 // @flow
 
 import { isInvalidPinSourceForThread } from '../shared/message-utils.js';
 import { threadHasPermission } from '../shared/thread-utils.js';
-import type {
-  ComposableMessageInfo,
-  RobotextMessageInfo,
-} from '../types/message-types.js';
+import type { RawMessageInfo, MessageInfo } from '../types/message-types.js';
 import { threadPermissions } from '../types/thread-permission-types.js';
-import type { ThreadInfo } from '../types/thread-types.js';
+import type { RawThreadInfo, ThreadInfo } from '../types/thread-types.js';
 
 function canToggleMessagePin(
-  messageInfo: ComposableMessageInfo | RobotextMessageInfo,
-  threadInfo: ThreadInfo,
+  messageInfo: RawMessageInfo | MessageInfo,
+  threadInfo: RawThreadInfo | ThreadInfo,
 ): boolean {
   const isValidMessage = !isInvalidPinSourceForThread(messageInfo, threadInfo);
   const hasManagePinsPermission = threadHasPermission(
     threadInfo,
     threadPermissions.MANAGE_PINS,
   );
 
   return isValidMessage && hasManagePinsPermission;
 }
 
 export { canToggleMessagePin };