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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package feed // import "miniflux.app/reader/feed"
import (
"fmt"
"time"
"miniflux.app/errors"
"miniflux.app/http/client"
"miniflux.app/locale"
"miniflux.app/logger"
"miniflux.app/model"
"miniflux.app/reader/browser"
"miniflux.app/reader/icon"
"miniflux.app/reader/parser"
"miniflux.app/reader/processor"
"miniflux.app/storage"
"miniflux.app/timer"
)
var (
errDuplicate = "This feed already exists (%s)"
errNotFound = "Feed %d not found"
errCategoryNotFound = "Category not found for this user"
)
// Handler contains all the logic to create and refresh feeds.
type Handler struct {
store *storage.Storage
}
// CreateFeed fetch, parse and store a new feed.
func (h *Handler) CreateFeed(userID, categoryID int64, url string, crawler bool, userAgent, username, password, scraperRules, rewriteRules string) (*model.Feed, error) {
defer timer.ExecutionTime(time.Now(), fmt.Sprintf("[Handler:CreateFeed] feedUrl=%s", url))
if !h.store.CategoryExists(userID, categoryID) {
return nil, errors.NewLocalizedError(errCategoryNotFound)
}
request := client.New(url)
request.WithCredentials(username, password)
request.WithUserAgent(userAgent)
response, requestErr := browser.Exec(request)
if requestErr != nil {
return nil, requestErr
}
if h.store.FeedURLExists(userID, response.EffectiveURL) {
return nil, errors.NewLocalizedError(errDuplicate, response.EffectiveURL)
}
subscription, parseErr := parser.ParseFeed(response.String())
if parseErr != nil {
return nil, parseErr
}
subscription.UserID = userID
subscription.WithCategoryID(categoryID)
subscription.WithBrowsingParameters(crawler, userAgent, username, password, scraperRules, rewriteRules)
subscription.WithClientResponse(response)
subscription.CheckedNow()
processor.ProcessFeedEntries(h.store, subscription)
if storeErr := h.store.CreateFeed(subscription); storeErr != nil {
return nil, storeErr
}
logger.Debug("[Handler:CreateFeed] Feed saved with ID: %d", subscription.ID)
checkFeedIcon(h.store, subscription.ID, subscription.SiteURL)
return subscription, nil
}
// RefreshFeed fetch and update a feed if necessary.
func (h *Handler) RefreshFeed(userID, feedID int64) error {
defer timer.ExecutionTime(time.Now(), fmt.Sprintf("[Handler:RefreshFeed] feedID=%d", feedID))
userLanguage := h.store.UserLanguage(userID)
printer := locale.NewPrinter(userLanguage)
originalFeed, storeErr := h.store.FeedByID(userID, feedID)
if storeErr != nil {
return storeErr
}
if originalFeed == nil {
return errors.NewLocalizedError(errNotFound, feedID)
}
originalFeed.CheckedNow()
request := client.New(originalFeed.FeedURL)
request.WithCredentials(originalFeed.Username, originalFeed.Password)
request.WithCacheHeaders(originalFeed.EtagHeader, originalFeed.LastModifiedHeader)
request.WithUserAgent(originalFeed.UserAgent)
response, requestErr := browser.Exec(request)
if requestErr != nil {
originalFeed.WithError(requestErr.Localize(printer))
h.store.UpdateFeedError(originalFeed)
return requestErr
}
if response.IsModified(originalFeed.EtagHeader, originalFeed.LastModifiedHeader) {
logger.Debug("[Handler:RefreshFeed] Feed #%d has been modified", feedID)
updatedFeed, parseErr := parser.ParseFeed(response.String())
if parseErr != nil {
originalFeed.WithError(parseErr.Localize(printer))
h.store.UpdateFeedError(originalFeed)
return parseErr
}
originalFeed.Entries = updatedFeed.Entries
processor.ProcessFeedEntries(h.store, originalFeed)
// We don't update existing entries when the crawler is enabled (we crawl only inexisting entries).
if storeErr := h.store.UpdateEntries(originalFeed.UserID, originalFeed.ID, originalFeed.Entries, !originalFeed.Crawler); storeErr != nil {
originalFeed.WithError(storeErr.Error())
h.store.UpdateFeedError(originalFeed)
return storeErr
}
// We update caching headers only if the feed has been modified,
// because some websites don't return the same headers when replying with a 304.
originalFeed.WithClientResponse(response)
checkFeedIcon(h.store, originalFeed.ID, originalFeed.SiteURL)
} else {
logger.Debug("[Handler:RefreshFeed] Feed #%d not modified", feedID)
}
originalFeed.ResetErrorCounter()
if storeErr := h.store.UpdateFeed(originalFeed); storeErr != nil {
originalFeed.WithError(storeErr.Error())
h.store.UpdateFeedError(originalFeed)
return storeErr
}
return nil
}
// NewFeedHandler returns a feed handler.
func NewFeedHandler(store *storage.Storage) *Handler {
return &Handler{store}
}
func checkFeedIcon(store *storage.Storage, feedID int64, websiteURL string) {
if !store.HasIcon(feedID) {
icon, err := icon.FindIcon(websiteURL)
if err != nil {
logger.Debug("CheckFeedIcon: %v (feedID=%d websiteURL=%s)", err, feedID, websiteURL)
} else if icon == nil {
logger.Debug("CheckFeedIcon: No icon found (feedID=%d websiteURL=%s)", feedID, websiteURL)
} else {
if err := store.CreateFeedIcon(feedID, icon); err != nil {
logger.Debug("CheckFeedIcon: %v (feedID=%d websiteURL=%s)", err, feedID, websiteURL)
}
}
}
}
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