userpage: use form langfile, move login strings to common

login-related stuff was moved into common using the langmover script, so
that the user page doesn't have to use the admin language files.

api-userpage.go

@@ -2,6 +2,23 @@ package main
 
 import "github.com/gin-gonic/gin"
 
-func (app *appContext) HelloWorld(gc *gin.Context) {
-	gc.JSON(200, stringResponse{"It worked!", "none"})
+// @Summary Returns the logged-in user's Jellyfin ID & Username.
+// @Produce json
+// @Success 200 {object} MyDetailsDTO
+// @Router /my/details [get]
+// @tags User Page
+func (app *appContext) MyDetails(gc *gin.Context) {
+	resp := MyDetailsDTO{
+		Id: gc.GetString("jfId"),
+	}
+
+	user, status, err := app.jf.UserByID(resp.Id, false)
+	if status != 200 || err != nil {
+		app.err.Printf("Failed to get Jellyfin user (%d): %+v\n", status, err)
+		respond(500, "Failed to get user", gc)
+		return
+	}
+	resp.Username = user.Name
+
+	gc.JSON(200, resp)
 }