feat(embed): [closes #92] Embed support (#177)

* feat(embed): [#92] hide unnecessary UI when embedded
* feat(embed): [#92] provide embed code

README.md

@@ -14,6 +14,7 @@ Chitchatter is a free (as in both price and freedom) communication tool. Designe
   - Message content is never persisted to disk on either the client or server
 - Decentralized
   - There is no API server. All that's required for Chitchatter to function is availability of GitHub for static assets, and public WebTorrent and STUN/TURN relay servers for establishing peer-to-peer communication.
+- Embeddable
 - [Self-hostable](#self-hosting)
 
 Chitchatter uses the [Create React App](https://github.com/facebook/create-react-app) toolchain. The secure networking and streaming magic would not be possible without [Trystero](https://github.com/dmotz/trystero). File transfer functionality is powered by [`secure-file-transfer`](https://github.com/jeremyckahn/secure-file-transfer).
@@ -31,6 +32,7 @@ Open https://chitchatter.im/ and join a room to start chatting with anyone else
 - File sharing:
   - Unlimited file size transfers.
   - Files are encrypted prior to sending and decrypted by the receiver (the key is the room name).
+- Embedding into other web apps via `iframe`.
 - Markdown support via [`react-markdown`](https://github.com/remarkjs/react-markdown).
   - Includes support for syntax highlighting of code.
 - Conversation backfilling from peers when a new participant joins.

src/components/Shell/Shell.tsx

@@ -15,7 +15,7 @@ import { useWindowSize } from '@react-hook/window-size'
 
 import { ShellContext } from 'contexts/ShellContext'
 import { SettingsContext } from 'contexts/SettingsContext'
-import { AlertOptions } from 'models/shell'
+import { AlertOptions, QueryParamKeys } from 'models/shell'
 import { AudioState, ScreenShareState, VideoState, Peer } from 'models/chat'
 import { ErrorBoundary } from 'components/ErrorBoundary'
 
@@ -41,8 +41,11 @@ export interface ShellProps extends PropsWithChildren {
   appNeedsUpdate: boolean
 }
 
+const queryParams = new URLSearchParams(window.location.search)
+
 export const Shell = ({ appNeedsUpdate, children, userPeerId }: ShellProps) => {
   const { getUserSettings, updateUserSettings } = useContext(SettingsContext)
+  const isEmbedded = queryParams.get(QueryParamKeys.IS_EMBEDDED) !== null
 
   const { colorMode } = getUserSettings()
 
@@ -65,7 +68,7 @@ export const Shell = ({ appNeedsUpdate, children, userPeerId }: ShellProps) => {
   const [isRoomShareDialogOpen, setIsRoomShareDialogOpen] = useState(false)
   const [alertSeverity, setAlertSeverity] = useState<AlertColor>('info')
   const [showAppBar, setShowAppBar] = useState(true)
-  const [showRoomControls, setShowRoomControls] = useState(true)
+  const [showRoomControls, setShowRoomControls] = useState(!isEmbedded)
   const [isFullscreen, setIsFullscreen] = useState(false)
   const [title, setTitle] = useState('')
   const [alertText, setAlertText] = useState('')
@@ -118,6 +121,7 @@ export const Shell = ({ appNeedsUpdate, children, userPeerId }: ShellProps) => {
 
   const shellContextValue = useMemo(
     () => ({
+      isEmbedded,
       tabHasFocus,
       showRoomControls,
       setShowRoomControls,
@@ -150,6 +154,7 @@ export const Shell = ({ appNeedsUpdate, children, userPeerId }: ShellProps) => {
       updatePeer,
     }),
     [
+      isEmbedded,
       isPeerListOpen,
       setIsQRCodeDialogOpen,
       roomId,
@@ -244,9 +249,12 @@ export const Shell = ({ appNeedsUpdate, children, userPeerId }: ShellProps) => {
     } else {
       exitFullscreen()
       setShowAppBar(true)
+
+      if (!isEmbedded) {
         setShowRoomControls(true)
       }
-  }, [isFullscreen, setShowRoomControls, setShowAppBar])
+    }
+  }, [isFullscreen, setShowRoomControls, setShowAppBar, isEmbedded])
 
   useEffect(() => {
     if (isFullscreen) setShowAppBar(showRoomControls)
@@ -344,13 +352,15 @@ export const Shell = ({ appNeedsUpdate, children, userPeerId }: ShellProps) => {
                 isFullscreen={isFullscreen}
                 setIsFullscreen={setIsFullscreen}
               />
+              {isEmbedded ? null : (
                 <Drawer
                   isDrawerOpen={isDrawerOpen}
                   onDrawerClose={handleDrawerClose}
                   theme={theme}
                 />
+              )}
               <RouteContent
-                isDrawerOpen={isDrawerOpen}
+                isDrawerOpen={isEmbedded ? true : isDrawerOpen}
                 isPeerListOpen={isPeerListOpen}
                 showAppBar={showAppBar}
               >

src/components/Shell/ShellAppBar.tsx

@@ -85,9 +85,10 @@ export const ShellAppBar = ({
   isFullscreen,
   setIsFullscreen,
 }: ShellAppBarProps) => {
-  const { peerList } = useContext(ShellContext)
+  const { peerList, isEmbedded } = useContext(ShellContext)
   const handleQRCodeClick = () => setIsQRCodeDialogOpen(true)
   const onClickFullscreen = () => setIsFullscreen(!isFullscreen)
+
   return (
     <>
       <Slide appear={false} in={showAppBar} mountOnEnter unmountOnExit>
@@ -104,6 +105,7 @@ export const ShellAppBar = ({
               justifyContent: 'space-between',
             }}
           >
+            {isEmbedded ? null : (
               <IconButton
                 size="large"
                 edge="start"
@@ -114,14 +116,17 @@ export const ShellAppBar = ({
               >
                 <Menu />
               </IconButton>
+            )}
             <Typography
               variant="h6"
               noWrap
               component="div"
               sx={{ marginRight: 'auto' }}
             >
-              {title}
+              {isEmbedded ? '' : title}
             </Typography>
+            {isEmbedded ? null : (
+              <>
                 <Tooltip title="Copy current URL">
                   <IconButton
                     size="large"
@@ -142,6 +147,8 @@ export const ShellAppBar = ({
                     <QrCode2 />
                   </IconButton>
                 </Tooltip>
+              </>
+            )}
             <Tooltip title="Show Room Controls">
               <IconButton
                 size="large"
@@ -152,6 +159,7 @@ export const ShellAppBar = ({
                 <RoomPreferences />
               </IconButton>
             </Tooltip>
+            {isEmbedded ? null : (
               <Tooltip
                 title={isFullscreen ? 'Exit fullscreen' : 'Enter fullscreen'}
               >
@@ -165,6 +173,7 @@ export const ShellAppBar = ({
                   {isFullscreen ? <FullscreenExit /> : <Fullscreen />}
                 </IconButton>
               </Tooltip>
+            )}
             <Tooltip title="Click to show peer list">
               <IconButton
                 size="large"

src/contexts/ShellContext.ts

@@ -7,6 +7,7 @@ import { ConnectionTestResults } from 'components/Shell/useConnectionTest'
 import { TrackerConnection } from 'services/ConnectionTest/ConnectionTest'
 
 interface ShellContextProps {
+  isEmbedded: boolean
   tabHasFocus: boolean
   showRoomControls: boolean
   setShowRoomControls: Dispatch<SetStateAction<boolean>>
@@ -41,6 +42,7 @@ interface ShellContextProps {
 }
 
 export const ShellContext = createContext<ShellContextProps>({
+  isEmbedded: false,
   tabHasFocus: true,
   showRoomControls: false,
   setShowRoomControls: () => {},

src/models/shell.ts

@@ -1,3 +1,7 @@
 import { AlertProps } from '@mui/material/Alert'
 
 export type AlertOptions = Pick<AlertProps, 'severity'>
+
+export enum QueryParamKeys {
+  IS_EMBEDDED = 'embed',
+}

src/pages/Home/Home.tsx

@@ -10,7 +10,28 @@ import IconButton from '@mui/material/IconButton'
 import MuiLink from '@mui/material/Link'
 import GitHubIcon from '@mui/icons-material/GitHub'
 import Cached from '@mui/icons-material/Cached'
+import Dialog from '@mui/material/Dialog'
+
+import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter'
+import { materialDark } from 'react-syntax-highlighter/dist/esm/styles/prism'
+import DialogActions from '@mui/material/DialogActions'
+import DialogContent from '@mui/material/DialogContent'
+import DialogContentText from '@mui/material/DialogContentText'
+import DialogTitle from '@mui/material/DialogTitle'
 import { v4 as uuid } from 'uuid'
+// These imports need to be ts-ignored to prevent spurious errors that look
+// like this:
+//
+//   Module 'react-markdown' cannot be imported using this construct. The
+//   specifier only resolves to an ES module, which cannot be imported
+//   synchronously. Use dynamic import instead. (tsserver 1471)
+//
+// @ts-ignore
+import Markdown from 'react-markdown'
+// @ts-ignore
+import { CodeProps } from 'react-markdown/lib/ast-to-react'
+// @ts-ignore
+import remarkGfm from 'remark-gfm'
 
 import { routes } from 'config/routes'
 import { ShellContext } from 'contexts/ShellContext'
@@ -24,6 +45,7 @@ interface HomeProps {
 export function Home({ userId }: HomeProps) {
   const { setTitle } = useContext(ShellContext)
   const [roomName, setRoomName] = useState(uuid())
+  const [showEmbedCode, setShowEmbedCode] = useState(false)
   const navigate = useNavigate()
 
   useEffect(() => {
@@ -47,8 +69,19 @@ export function Home({ userId }: HomeProps) {
     navigate(`/private/${roomName}`)
   }
 
+  const handleGetEmbedCodeClick = () => {
+    setShowEmbedCode(true)
+  }
+
+  const handleEmbedCodeWindowClose = () => {
+    setShowEmbedCode(false)
+  }
+
   const isRoomNameValid = roomName.length > 0
 
+  const embedUrl = new URL(`${window.location.origin}/public/${roomName}`)
+  embedUrl.search = new URLSearchParams({ embed: '1' }).toString()
+
   return (
     <Box className="Home">
       <main className="mt-6 px-4 max-w-3xl text-center mx-auto">
@@ -110,6 +143,18 @@ export function Home({ userId }: HomeProps) {
             >
               Join private room
             </Button>
+            <Button
+              variant="contained"
+              color="secondary"
+              onClick={handleGetEmbedCodeClick}
+              sx={{
+                marginTop: 2,
+                marginLeft: 2,
+              }}
+              disabled={!isRoomNameValid}
+            >
+              Get embed code
+            </Button>
           </Box>
         </form>
       </main>
@@ -164,6 +209,49 @@ export function Home({ userId }: HomeProps) {
         </MuiLink>
         .
       </Typography>
+      <Dialog open={showEmbedCode} onClose={handleEmbedCodeWindowClose}>
+        <DialogTitle>Room embed code</DialogTitle>
+        <DialogContent>
+          <Markdown
+            remarkPlugins={[remarkGfm]}
+            components={{
+              // https://github.com/remarkjs/react-markdown#use-custom-components-syntax-highlight
+              code({
+                node,
+                inline,
+                className,
+                children,
+                style,
+                ...props
+              }: CodeProps) {
+                return (
+                  <SyntaxHighlighter
+                    children={String(children).replace(/\n$/, '')}
+                    language="html"
+                    style={materialDark}
+                    PreTag="div"
+                    lineProps={{
+                      style: { wordBreak: 'break-all', whiteSpace: 'pre-wrap' },
+                    }}
+                    wrapLines={true}
+                    {...props}
+                  />
+                )
+              },
+            }}
+          >
+            {`\`\`\`html
+<iframe src="${embedUrl}" allow="camera;microphone;display-capture" width="800" height="800" />
+\`\`\``}
+          </Markdown>
+          <DialogContentText sx={{ mb: 2 }}>
+            Copy and paste this HTML snippet into your project.
+          </DialogContentText>
+        </DialogContent>
+        <DialogActions>
+          <Button onClick={handleEmbedCodeWindowClose}>Close</Button>
+        </DialogActions>
+      </Dialog>
     </Box>
   )
 }