mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2024-12-13 00:57:27 +01:00
186 lines
7.1 KiB
Go
186 lines
7.1 KiB
Go
package streaming
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import (
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"fmt"
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/gorilla/websocket"
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)
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// StreamGETHandler swagger:operation GET /api/v1/streaming streamGet
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//
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// Initiate a websocket connection for live streaming of statuses and notifications.
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//
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// The scheme used should *always* be `wss`. The streaming basepath can be viewed at `/api/v1/instance`.
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//
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// On a successful connection, a code `101` will be returned, which indicates that the connection is being upgraded to a secure websocket connection.
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//
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// As long as the connection is open, various message types will be streamed into it.
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//
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// GoToSocial will ping the connection every 30 seconds to check whether the client is still receiving.
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//
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// If the ping fails, or something else goes wrong during transmission, then the connection will be dropped, and the client will be expected to start it again.
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//
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// ---
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// tags:
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// - streaming
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//
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// produces:
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// - application/json
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//
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// schemes:
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// - wss
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//
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// parameters:
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// - name: access_token
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// type: string
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// description: Access token for the requesting account.
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// in: query
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// required: true
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// - name: stream
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// type: string
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// description: |-
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// Type of stream to request.
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//
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// Options are:
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//
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// `user`: receive updates for the account's home timeline.
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// `public`: receive updates for the public timeline.
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// `public:local`: receive updates for the local timeline.
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// `hashtag`: receive updates for a given hashtag.
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// `hashtag:local`: receive local updates for a given hashtag.
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// `list`: receive updates for a certain list of accounts.
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// `direct`: receive updates for direct messages.
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// in: query
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// required: true
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// security:
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// - OAuth2 Bearer:
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// - read:streaming
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//
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// responses:
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// '101':
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// schema:
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// type: object
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// properties:
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// stream:
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// type: array
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// items:
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// type: string
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// enum:
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// - user
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// - public
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// - public:local
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// - hashtag
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// - hashtag:local
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// - list
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// - direct
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// event:
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// description: |-
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// The type of event being received.
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//
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// `update`: a new status has been received.
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// `notification`: a new notification has been received.
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// `delete`: a status has been deleted.
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// `filters_changed`: not implemented.
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// type: string
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// enum:
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// - update
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// - notification
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// - delete
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// - filters_changed
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// payload:
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// description: |-
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// The payload of the streamed message.
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// Different depending on the `event` type.
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//
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// If present, it should be parsed as a string.
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//
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// If `event` = `update`, then the payload will be a JSON string of a status.
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// If `event` = `notification`, then the payload will be a JSON string of a notification.
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// If `event` = `delete`, then the payload will be a status ID.
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// type: string
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// example: "{\"id\":\"01FC3TZ5CFG6H65GCKCJRKA669\",\"created_at\":\"2021-08-02T16:25:52Z\",\"sensitive\":false,\"spoiler_text\":\"\",\"visibility\":\"public\",\"language\":\"en\",\"uri\":\"https://gts.superseriousbusiness.org/users/dumpsterqueer/statuses/01FC3TZ5CFG6H65GCKCJRKA669\",\"url\":\"https://gts.superseriousbusiness.org/@dumpsterqueer/statuses/01FC3TZ5CFG6H65GCKCJRKA669\",\"replies_count\":0,\"reblogs_count\":0,\"favourites_count\":0,\"favourited\":false,\"reblogged\":false,\"muted\":false,\"bookmarked\":fals…//gts.superseriousbusiness.org/fileserver/01JNN207W98SGG3CBJ76R5MVDN/header/original/019036W043D8FXPJKSKCX7G965.png\",\"header_static\":\"https://gts.superseriousbusiness.org/fileserver/01JNN207W98SGG3CBJ76R5MVDN/header/small/019036W043D8FXPJKSKCX7G965.png\",\"followers_count\":33,\"following_count\":28,\"statuses_count\":126,\"last_status_at\":\"2021-08-02T16:25:52Z\",\"emojis\":[],\"fields\":[]},\"media_attachments\":[],\"mentions\":[],\"tags\":[],\"emojis\":[],\"card\":null,\"poll\":null,\"text\":\"a\"}"
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// '401':
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// description: unauthorized
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// '400':
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// description: bad request
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func (m *Module) StreamGETHandler(c *gin.Context) {
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l := m.log.WithField("func", "StreamGETHandler")
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streamType := c.Query(StreamQueryKey)
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if streamType == "" {
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c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("no stream type provided under query key %s", StreamQueryKey)})
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return
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}
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accessToken := c.Query(AccessTokenQueryKey)
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if accessToken == "" {
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c.JSON(http.StatusUnauthorized, gin.H{"error": fmt.Sprintf("no access token provided under query key %s", AccessTokenQueryKey)})
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return
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}
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// make sure a valid token has been provided and obtain the associated account
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account, err := m.processor.AuthorizeStreamingRequest(c.Request.Context(), accessToken)
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if err != nil {
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c.JSON(http.StatusUnauthorized, gin.H{"error": "could not authorize with given token"})
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return
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}
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// prepare to upgrade the connection to a websocket connection
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upgrader := websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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CheckOrigin: func(r *http.Request) bool {
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// we fully expect cors requests (via something like pinafore.social) so we should be lenient here
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return true
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},
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}
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// do the actual upgrade here
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conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
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if err != nil {
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l.Infof("error upgrading websocket connection: %s", err)
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return
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}
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defer conn.Close() // whatever happens, when we leave this function we want to close the websocket connection
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// inform the processor that we have a new connection and want a s for it
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s, errWithCode := m.processor.OpenStreamForAccount(c.Request.Context(), account, streamType)
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if errWithCode != nil {
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c.JSON(errWithCode.Code(), errWithCode.Safe())
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return
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}
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defer close(s.Hangup) // closing stream.Hangup indicates that we've finished with the connection (the client has gone), so we want to do this on exiting this handler
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// spawn a new ticker for pinging the connection periodically
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t := time.NewTicker(30 * time.Second)
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// we want to stay in the sendloop as long as possible while the client is connected -- the only thing that should break the loop is if the client leaves or something else goes wrong
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sendLoop:
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for {
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select {
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case m := <-s.Messages:
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// we've got a streaming message!!
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l.Trace("received message from stream")
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if err := conn.WriteJSON(m); err != nil {
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l.Debugf("error writing json to websocket connection: %s", err)
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// if something is wrong we want to bail and drop the connection -- the client will create a new one
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break sendLoop
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}
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l.Trace("wrote message into websocket connection")
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case <-t.C:
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l.Trace("received TICK from ticker")
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if err := conn.WriteMessage(websocket.PingMessage, []byte(": ping")); err != nil {
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l.Debugf("error writing ping to websocket connection: %s", err)
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// if something is wrong we want to bail and drop the connection -- the client will create a new one
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break sendLoop
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}
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l.Trace("wrote ping message into websocket connection")
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}
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}
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l.Trace("leaving StreamGETHandler")
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}
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