implement basic chat history endpoint

1 files changed, 41 insertions, 0 deletions

diff --git a/srv/api/chat.go b/srv/api/chat.go
new file mode 100644
index 0000000..84fffde
--- /dev/null
+++ b/srv/api/chat.go
@@ -0,0 +1,41 @@
+package api
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/chat"
+)
+
+func (a *api) chatHistoryHandler() http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		limit, err := strToInt(r.FormValue("limit"), 0)
+		if err != nil {
+			badRequest(rw, r, fmt.Errorf("invalid limit parameter: %w", err))
+			return
+		}
+
+		cursor := r.FormValue("cursor")
+
+		cursor, msgs, err := a.params.GlobalRoom.History(r.Context(), chat.HistoryOpts{
+			Limit:  limit,
+			Cursor: cursor,
+		})
+
+		if argErr := (chat.ErrInvalidArg{}); errors.As(err, &argErr) {
+			badRequest(rw, r, argErr.Err)
+			return
+		} else if err != nil {
+			internalServerError(rw, r, err)
+		}
+
+		jsonResult(rw, r, struct {
+			Cursor   string         `json:"cursor"`
+			Messages []chat.Message `json:"messages"`
+		}{
+			Cursor:   cursor,
+			Messages: msgs,
+		})
+	})
+}