| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "database/sql" |
| 6 | "fmt" |
| 7 | "io" |
| 8 | "net/http" |
| 9 | "strings" |
| 10 | "time" |
| 11 | ) |
| 12 | |
| 13 | const errAlreadySubscribed = "already subscribed" |
| 14 | |
| 15 | func (a *App) createSubscription(ctx context.Context, body createSubscriptionBody, background bool) (*Subscription, error) { |
| 16 | feedURL := strings.TrimSpace(body.FeedURL) |
| 17 | if feedURL == "" { |
| 18 | return nil, fmt.Errorf("feed_url required") |
| 19 | } |
| 20 | existing, err := getSubscriptionByURL(a.DB, feedURL) |
| 21 | if err != nil { |
| 22 | return nil, err |
| 23 | } |
| 24 | if existing != nil { |
| 25 | return nil, fmt.Errorf(errAlreadySubscribed) |
| 26 | } |
| 27 | categoryID, err := a.resolveCategory(body.CategoryID, body.CategoryName) |
| 28 | if err != nil { |
| 29 | return nil, err |
| 30 | } |
| 31 | title := firstNonEmpty(body.Title, feedURL) |
| 32 | if background { |
| 33 | return a.createSubscriptionInBackground(feedURL, title, body, categoryID) |
| 34 | } |
| 35 | return a.createSubscriptionImmediately(ctx, feedURL, title, body, categoryID) |
| 36 | } |
| 37 | |
| 38 | func (a *App) createSubscriptionInBackground(feedURL, title string, body createSubscriptionBody, categoryID *int64) (*Subscription, error) { |
| 39 | sub, err := insertSubscription(a.DB, feedURL, title, nil, categoryID) |
| 40 | if err != nil { |
| 41 | return nil, err |
| 42 | } |
| 43 | go func(subID int64, originalTitle string) { |
| 44 | res, err := fetchFeed(context.Background(), feedURL, "", "") |
| 45 | if err != nil { |
| 46 | msg := err.Error() |
| 47 | _ = updateSubscriptionMeta(a.DB, subID, nil, nil, &msg) |
| 48 | return |
| 49 | } |
| 50 | resolvedTitle := firstNonEmpty(body.Title, res.Title, feedURL) |
| 51 | if resolvedTitle != originalTitle { |
| 52 | _ = updateSubscriptionTitle(a.DB, subID, resolvedTitle) |
| 53 | } |
| 54 | if res.SiteURL != "" { |
| 55 | _ = updateSubscriptionSiteURL(a.DB, subID, &res.SiteURL) |
| 56 | if fav := discoverFavicon(context.Background(), res.SiteURL); fav != "" { |
| 57 | _ = updateSubscriptionFavicon(a.DB, subID, &fav) |
| 58 | } |
| 59 | } |
| 60 | _ = a.seedSubscription(subID, res) |
| 61 | }(sub.ID, sub.Title) |
| 62 | return sub, nil |
| 63 | } |
| 64 | |
| 65 | func (a *App) createSubscriptionImmediately(ctx context.Context, feedURL, title string, body createSubscriptionBody, categoryID *int64) (*Subscription, error) { |
| 66 | res, err := fetchFeed(ctx, feedURL, "", "") |
| 67 | if err != nil { |
| 68 | return nil, fmt.Errorf("feed not reachable: %w", err) |
| 69 | } |
| 70 | resolvedTitle := firstNonEmpty(body.Title, res.Title, feedURL) |
| 71 | siteURL := stringPtr(res.SiteURL) |
| 72 | sub, err := insertSubscription(a.DB, feedURL, resolvedTitle, siteURL, categoryID) |
| 73 | if err != nil { |
| 74 | return nil, err |
| 75 | } |
| 76 | if res.SiteURL != "" { |
| 77 | if fav := discoverFavicon(ctx, res.SiteURL); fav != "" { |
| 78 | _ = updateSubscriptionFavicon(a.DB, sub.ID, &fav) |
| 79 | sub.FaviconURL = sql.NullString{String: fav, Valid: true} |
| 80 | } |
| 81 | } |
| 82 | if err := a.seedSubscription(sub.ID, res); err != nil { |
| 83 | return nil, err |
| 84 | } |
| 85 | return getSubscription(a.DB, sub.ID) |
| 86 | } |
| 87 | |
| 88 | func (a *App) seedSubscription(subID int64, res *FetchResult) error { |
| 89 | for _, entry := range res.Entries { |
| 90 | if strings.TrimSpace(entry.Link) == "" { |
| 91 | continue |
| 92 | } |
| 93 | _, err := insertItemIgnoreDup(a.DB, NewItem{SubscriptionID: subID, GUID: entry.GUID, Title: entry.Title, Link: entry.Link, Author: entry.Author, PublishedAt: entry.PublishedAt}) |
| 94 | if err != nil { |
| 95 | a.Log.Warn("seed insert failed", "sub_id", subID, "err", err) |
| 96 | } |
| 97 | } |
| 98 | if err := pruneSubscription(a.DB, subID, a.ItemCap); err != nil { |
| 99 | return err |
| 100 | } |
| 101 | return updateSubscriptionMeta(a.DB, subID, stringPtr(res.ETag), stringPtr(res.LastModified), nil) |
| 102 | } |
| 103 | |
| 104 | func (a *App) resolveCategory(id *int64, name string) (*int64, error) { |
| 105 | if id != nil { |
| 106 | return id, nil |
| 107 | } |
| 108 | if strings.TrimSpace(name) == "" { |
| 109 | return nil, nil |
| 110 | } |
| 111 | cat, err := getOrCreateCategory(a.DB, name) |
| 112 | if err != nil || cat == nil { |
| 113 | return nil, err |
| 114 | } |
| 115 | return &cat.ID, nil |
| 116 | } |
| 117 | |
| 118 | func (a *App) resolveSubscriptionCategory(body updateSubscriptionBody) (*int64, error) { |
| 119 | if body.ClearCategory { |
| 120 | return nil, nil |
| 121 | } |
| 122 | return a.resolveCategory(body.CategoryID, body.CategoryName) |
| 123 | } |
| 124 | |
| 125 | func (a *App) readAndImportOPML(r *http.Request) (*importSummary, error) { |
| 126 | if err := r.ParseMultipartForm(8 << 20); err != nil { |
| 127 | return nil, err |
| 128 | } |
| 129 | file, _, err := r.FormFile("file") |
| 130 | if err != nil { |
| 131 | return nil, err |
| 132 | } |
| 133 | defer file.Close() |
| 134 | body, err := io.ReadAll(file) |
| 135 | if err != nil { |
| 136 | return nil, err |
| 137 | } |
| 138 | return a.importOPMLString(r.Context(), string(body)), nil |
| 139 | } |
| 140 | |
| 141 | func (a *App) importOPMLString(ctx context.Context, content string) *importSummary { |
| 142 | entries := parseOPML(content) |
| 143 | summary := &importSummary{} |
| 144 | for _, entry := range entries { |
| 145 | existing, _ := getSubscriptionByURL(a.DB, entry.XMLURL) |
| 146 | if existing != nil { |
| 147 | summary.Skipped++ |
| 148 | continue |
| 149 | } |
| 150 | body := createSubscriptionBody{FeedURL: entry.XMLURL, Title: entry.Title, CategoryName: entry.Category} |
| 151 | if _, err := a.createSubscription(ctx, body, true); err != nil { |
| 152 | summary.Failed = append(summary.Failed, fmt.Sprintf("%s: %v", entry.XMLURL, err)) |
| 153 | continue |
| 154 | } |
| 155 | summary.Imported++ |
| 156 | } |
| 157 | return summary |
| 158 | } |
| 159 | |
| 160 | func (a *App) poller(ctx context.Context) { |
| 161 | time.Sleep(3 * time.Second) |
| 162 | for { |
| 163 | mins := a.pollIntervalMinutes() |
| 164 | a.Log.Info("poller pass starting", "interval_minutes", mins) |
| 165 | subs, err := listSubscriptions(a.DB) |
| 166 | if err == nil { |
| 167 | for _, sub := range subs { |
| 168 | if err := a.pollOne(ctx, sub); err != nil { |
| 169 | msg := err.Error() |
| 170 | _ = updateSubscriptionMeta(a.DB, sub.ID, nullStringPointer(sub.ETag), nullStringPointer(sub.LastModified), &msg) |
| 171 | a.Log.Warn("feed poll failed", "feed_url", sub.FeedURL, "err", err) |
| 172 | } |
| 173 | } |
| 174 | } |
| 175 | time.Sleep(time.Duration(mins) * time.Minute) |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | func (a *App) pollOne(ctx context.Context, sub Subscription) error { |
| 180 | res, err := fetchFeed(ctx, sub.FeedURL, nullStringValue(sub.ETag), nullStringValue(sub.LastModified)) |
| 181 | if err != nil { |
| 182 | return err |
| 183 | } |
| 184 | inserted := 0 |
| 185 | if res.Status != http.StatusNotModified { |
| 186 | for _, entry := range res.Entries { |
| 187 | ok, err := insertItemIgnoreDup(a.DB, NewItem{SubscriptionID: sub.ID, GUID: entry.GUID, Title: entry.Title, Link: entry.Link, Author: entry.Author, PublishedAt: entry.PublishedAt}) |
| 188 | if err != nil { |
| 189 | a.Log.Warn("insert item failed", "feed_url", sub.FeedURL, "err", err) |
| 190 | continue |
| 191 | } |
| 192 | if ok { |
| 193 | inserted++ |
| 194 | } |
| 195 | } |
| 196 | if res.Title != "" && sub.Title == sub.FeedURL && res.Title != sub.Title { |
| 197 | _ = updateSubscriptionTitle(a.DB, sub.ID, res.Title) |
| 198 | } |
| 199 | if err := pruneSubscription(a.DB, sub.ID, a.ItemCap); err != nil { |
| 200 | return err |
| 201 | } |
| 202 | } |
| 203 | if err := updateSubscriptionMeta(a.DB, sub.ID, stringPtr(res.ETag), stringPtr(res.LastModified), nil); err != nil { |
| 204 | return err |
| 205 | } |
| 206 | a.Log.Info("feed polled", "feed_url", sub.FeedURL, "status", res.Status, "new_items", inserted, "entries", len(res.Entries)) |
| 207 | return nil |
| 208 | } |
| 209 | |
| 210 | func (a *App) pollIntervalMinutes() int { |
| 211 | if value, ok, err := getSetting(a.DB, "poll_interval_minutes"); err == nil && ok { |
| 212 | if mins, err := parsePositiveInt(value); err == nil { |
| 213 | return mins |
| 214 | } |
| 215 | } |
| 216 | return a.DefaultPollMinutes |
| 217 | } |
| 218 | |
| 219 | func isAlreadySubscribedError(err error) bool { |
| 220 | return err != nil && strings.Contains(err.Error(), errAlreadySubscribed) |
| 221 | } |