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page.go
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page.go
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/*
Copyright 2023, 2024 Dima Krasner
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package front
import (
"database/sql"
"fmt"
"github.com/dimkr/tootik/front/text"
"net/url"
"strconv"
)
func getOffset(requestUrl *url.URL) (int, error) {
if requestUrl.RawQuery == "" {
return 0, nil
}
query, err := url.QueryUnescape(requestUrl.RawQuery)
if err != nil {
return 0, err
}
offset, err := strconv.ParseInt(query, 10, 32)
if err != nil {
return 0, err
}
return int(offset), nil
}
func (h *Handler) showFeedPage(w text.Writer, r *request, title string, query func(int) (*sql.Rows, error), printDaySeparators bool) {
offset, err := getOffset(r.URL)
if err != nil {
r.Log.Info("Failed to parse query", "url", r.URL, "error", err)
w.Status(40, "Invalid query")
return
}
if offset > h.Config.MaxOffset {
r.Log.Warn("Offset is too big", "offset", offset)
w.Statusf(40, "Offset must be <= %d", h.Config.MaxOffset)
return
}
rows, err := query(offset)
if err != nil {
r.Log.Warn("Failed to fetch posts", "error", err)
w.Error()
return
}
defer rows.Close()
notes := make([]feedRow, h.Config.PostsPerPage)
count := 0
for rows.Next() {
if err := rows.Scan(¬es[count].Note, ¬es[count].Author, ¬es[count].Sharer, ¬es[count].Published); err != nil {
r.Log.Warn("Failed to scan post", "error", err)
continue
}
count++
}
rows.Close()
w.OK()
if offset >= h.Config.PostsPerPage || count == h.Config.PostsPerPage {
w.Titlef("%s (%d-%d)", title, offset, offset+h.Config.PostsPerPage)
} else {
w.Title(title)
}
if count == 0 {
w.Text("No posts.")
} else {
r.PrintNotes(w, notes[:count], true, printDaySeparators)
}
if offset >= h.Config.PostsPerPage || count == h.Config.PostsPerPage {
w.Separator()
}
if offset >= h.Config.PostsPerPage {
w.Linkf(fmt.Sprintf("%s?%d", r.URL.Path, offset-h.Config.PostsPerPage), "Previous page (%d-%d)", offset-h.Config.PostsPerPage, offset)
}
if count == h.Config.PostsPerPage && offset+h.Config.PostsPerPage <= h.Config.MaxOffset {
w.Linkf(fmt.Sprintf("%s?%d", r.URL.Path, offset+h.Config.PostsPerPage), "Next page (%d-%d)", offset+h.Config.PostsPerPage, offset+2*h.Config.PostsPerPage)
}
}