eintopf.info@v0.13.16/service/ical/transport.go (about)

     1  // Copyright (C) 2022 The Eintopf authors
     2  //
     3  // This program is free software: you can redistribute it and/or modify
     4  // it under the terms of the GNU Affero General Public License as
     5  // published by the Free Software Foundation, either version 3 of the
     6  // License, or (at your option) any later version.
     7  //
     8  // This program is distributed in the hope that it will be useful,
     9  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    10  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    11  // GNU Affero General Public License for more details.
    12  //
    13  // You should have received a copy of the GNU Affero General Public License
    14  // along with this program.  If not, see <https://www.gnu.org/licenses/>.
    15  
    16  package ical
    17  
    18  import (
    19  	"context"
    20  	"fmt"
    21  	"net/http"
    22  
    23  	"github.com/go-chi/chi/v5"
    24  
    25  	"eintopf.info/internal/plausible"
    26  	"eintopf.info/internal/xhttp"
    27  	"eintopf.info/service/eventsearch"
    28  )
    29  
    30  func Routes(service Service, plausibleClient *plausible.Client) func(r chi.Router) {
    31  	router := router{service: service}
    32  	return func(r chi.Router) {
    33  		r.Use(plausible.MiddlewareWithName(plausibleClient, "ical"))
    34  		r.Get("/ical", router.getEventsIcalFeed)
    35  		r.Get("/events/{id}/ical", router.getEventIcal)
    36  		r.Get("/groups/{id}/ical", router.getGroupIcalFeed)
    37  		r.Get("/places/{id}/ical", router.getPlaceIcalFeed)
    38  	}
    39  }
    40  
    41  type router struct {
    42  	service Service
    43  }
    44  
    45  func (router router) getEventsIcalFeed(w http.ResponseWriter, r *http.Request) {
    46  	opts, err := eventsearch.OptionsFromRequest(r)
    47  	if err != nil {
    48  		xhttp.WriteBadRequest(r.Context(), w, err)
    49  		return
    50  	}
    51  	feed, err := router.service.Feed(r.Context(), opts)
    52  	if err != nil {
    53  		xhttp.WriteError(r.Context(), w, err)
    54  		return
    55  	}
    56  	err = writeIcal(r.Context(), w, "eintopf", feed)
    57  	if err != nil {
    58  		xhttp.WriteInternalError(r.Context(), w, err)
    59  		return
    60  	}
    61  }
    62  
    63  func (router router) getEventIcal(w http.ResponseWriter, r *http.Request) {
    64  	id := chi.URLParam(r, "id")
    65  	if id == "" {
    66  		xhttp.WriteBadRequest(r.Context(), w, fmt.Errorf("empty id"))
    67  		return
    68  	}
    69  	ical, err := router.service.EventIcal(r.Context(), id)
    70  	if err != nil {
    71  		xhttp.WriteError(r.Context(), w, err)
    72  		return
    73  	}
    74  	err = writeIcal(r.Context(), w, id, ical)
    75  	if err != nil {
    76  		xhttp.WriteInternalError(r.Context(), w, err)
    77  		return
    78  	}
    79  }
    80  
    81  func (router router) getGroupIcalFeed(w http.ResponseWriter, r *http.Request) {
    82  	id := chi.URLParam(r, "id")
    83  	if id == "" {
    84  		xhttp.WriteBadRequest(r.Context(), w, fmt.Errorf("empty id"))
    85  		return
    86  	}
    87  	ical, err := router.service.GroupFeed(r.Context(), id)
    88  	if err != nil {
    89  		xhttp.WriteError(r.Context(), w, err)
    90  		return
    91  	}
    92  	err = writeIcal(r.Context(), w, id, ical)
    93  	if err != nil {
    94  		xhttp.WriteInternalError(r.Context(), w, err)
    95  		return
    96  	}
    97  }
    98  
    99  func (router router) getPlaceIcalFeed(w http.ResponseWriter, r *http.Request) {
   100  	id := chi.URLParam(r, "id")
   101  	if id == "" {
   102  		xhttp.WriteBadRequest(r.Context(), w, fmt.Errorf("empty id"))
   103  		return
   104  	}
   105  	ical, err := router.service.PlaceFeed(r.Context(), id)
   106  	if err != nil {
   107  		xhttp.WriteError(r.Context(), w, err)
   108  		return
   109  	}
   110  	err = writeIcal(r.Context(), w, id, ical)
   111  	if err != nil {
   112  		xhttp.WriteInternalError(r.Context(), w, err)
   113  		return
   114  	}
   115  }
   116  
   117  func writeIcal(ctx context.Context, w http.ResponseWriter, filename, ical string) error {
   118  	w.Header().Add("Content-type", "text/calendar; charset=utf-8")
   119  	w.Header().Add("Content-Disposition", fmt.Sprintf("inline; filename=%s.ics", filename))
   120  	_, err := w.Write([]byte(ical))
   121  	if err != nil {
   122  		return err
   123  	}
   124  	return nil
   125  }